Acrel EMS For Energy Eficiency Retrofit Project in HongKong

There is such a project, which is located in the Hong Kong. The time is at the peak of the Shanghai epidemic in 2022. Affected by the epidemic, it is impossible to send people to the site for debugging. However, the project was successfully accepted and received praise from customers. How did this come true? Today, I will share such a case with you and tell how we did it. Project background In order to promote the construction of green campuses, the Electrical and Mechanical Services Department of the Hong Kong Special Administrative Region Government launched a tender to carry out energy-saving renovations for public schools in Hong Kong. A local technology company in Hong Kong learned about our company's products and solutions through the Internet, and hoped to cooperate with our company to participate in the construction of a real-time energy monitoring system. Project requirements In the government's bidding documents, the main requirements for the energy real-time monitoring system are as follows: * Monitor school energy consumption, including teaching buildings , administrative buildings , auditoriums and sports buildings, etc. Electric energy consumption should be subdivided into ventilation , air conditioning, lighting and other uses, etc.;   *It is necessary to display the power consumption of the entire school, floors, rooms and main electrical equipment over a period of time through bar charts , line charts, pie charts and other charts . When abnormal power consumption is found, an alarm should be generated . The system also needs to realize carbon emission statistics and carbon footprint analysis;   * The system needs to be developed based on HTML5 , allowing users to access remotely through browsers on personal computers, mobile phones, smart TVs or tablets. It should support Chinese and English versions , have a friendly graphical user interface , and the design of Ul is vivid and attractive to students ;   * The data should be kept safely for at least 36 months , and the energy data upload frequency should not exceed 15 minutes;   * The system should allow multiple users to log in at the same time, and set unique login names and passwords for different users . The data should be accessible remotely, and the access rights are designated by the school administrator ;   * The system should provide Modbus - TCP, BacNet or OPC protocol for the third-party system to call data;   * The data collector of the system should adopt modular design, adopt guide rail installation, low power consumption, support RS485 interface , Ethernet interface , IO interface, support 4-20mA analog signal acquisition, support carbon dioxide sensor , humidity sensor , temperature sensor , weather station information collection through Modbus-RTU, Modbus-TCP;   3.Significance of the project Since the main requirements of the project are the monitoring and management of electric energy, the Acrel-3000 electric energy management system was finally selected to participate in the project bidding. After online communication, product sample delivery, software customization development, and on-site testing, the final system met the requirements of the bidding and successfully won the bid.     Project summary This project was able to successfully win the bid and acceptance under so many unfavorable conditions, and the client is still very appreciative. There are the following reasons to share.   1) The comprehensive functions of the Acrel-3000 power management system are the guarantee for winning the bid and acceptance of the project Acrel-3000 power management system not only meets the real-time requirements of power distribution monitoring, but also has powerful power statistics and analysis functions. The system supports Simplified Chinese, Traditional Chinese, and English display at the same time to meet the language usage habits of different groups of people. The system is developed based on HTML5 and supports access anytime and anywhere through a browser. The system sets up three roles according to the government mechanical and electrical department, school staff , and students of different classes . Different roles have different operation permissions and data access permissions, which meets the requirements for authority management in the bidding documents.   This project uses Wifi wireless networking to reduce wiring and reduce implementation costs. The system debugging process is standardized and easy to use. After remote guidance, the customer will implement it locally. 2) It is very important to choose the right solution to reduce costs and increase efficiency The project collects data through the ANet gateway. Since the ANet gateway has the functions of local storage and resumed transmission, it can ensure that the data will not be lost even when the wireless network fluctuates, the server is shut down or restarted , which reduces maintenance and after-sales costs and improves user satisfaction.   3) Professional ability and enthusiastic service are the basis of long-term cooperation It is the first time for a user to cooperate with us, and they are not familiar with our instruments and systems, and the project was implemented during the epidemic. The company could not send personnel to on-site training and debugging, and could only use remote guidance and video communication. It was necessary to continuously respond to customer needs and questions in real time, and guide customers to master system debugging methods and software usage methods. In the end, we were recognized by customers with our professional ability and enthusiastic service, and we are willing to cooperate with us for a long time.   At present, the Acrel-3000 power management system has been successfully deployed in 15 schools in Hong Kong, accumulatively connected to more than 2,000 power monitoring points. After the epidemic ended, customers came to visit the company as soon as possible, expressing their intention for more in-depth cooperation. Customers' recognition of our system and satisfaction with our services are our biggest motivation for continuous improvement!

AM5-DB Low-voltage Automatic Switching Device for Backup Power Supply

AM5-DB Low-voltage Automatic Switching Device for Backup Power Supply Application in Dongting Substation Project of Hebei Guanyi Rongxin Technology Company Lukas Lu Jiangsu Acrel Electrical Manufacturing Co.LTD.   Wuxi Jiangsu  214405 Abstract: With the increasing demand for electricity, power supply reliability requirements of the power system is becoming higher and higher, many power supply systems have two or more power supply lines. Automatic switching device for backup power supply can effectively improve the reliability of power supply, this type of device can automatically and quickly put the backup power supply into operation or switch the user to the backup power supply after the working power supply is disconnected due to a fault. This paper introduces AM5-DB low-voltage automatic switching device for backup power supply, which can provide corresponding protection functions for different power supply modes in Dongting substation project, and can greatly improve the reliability, safety and power supply quality of substation operation, which is conducive to the realization of comprehensive automation of the substation, and the realization of unmanned or fewer people on duty.   Keywords: Reliability; automatic switching of backup power supply; low-voltage automatic switching device for backup power supply   1 Project Overview This project is the new construction of Hunan Dongting 500kV substation, the main content of the project is the substation low-voltage distribution cabinet, including three station transformer inlet and one contact, of which the voltage level of 0# station transformer is 10kV/0.4kV, and the voltage level of 1# and 2# station transformers is 35kV/0.4kV.When any station transformer is withdrawn, the backup station transformer should be able to automatically switch to the de-energized work busbar section to continue power supply. And when the low-voltage working busbar of the station is equipped with equipment self switching devices, it should have the function of low-voltage busbar fault blocking backup self switching. The low-voltage backup automatic switching device for this project is provided by Acrel Electric, and Hebei Guanyi Rongxin Technology Co., Ltd. is responsible for construction and operation maintenance. Hebei Guanyi Rongxin Technology Co., Ltd. is a comprehensive energy technology service enterprise, which is committed to the research and development, production and sales of energy-saving equipment for intelligent server room, intelligent battery management system, energy storage system, smart grid products, development, investment, construction and operation service of new energy projects, general contracting service of electric power engineering projects, and operation and maintenance service of electric power, etc. The company consists of marketing center, R&D center, design center, production center, engineering center, operation center, financial center, comprehensive center, has a perfect management system, and constantly innovate to improve the competitiveness of enterprises. The company has achieved rapid, stable, and healthy development through technological progress, scientific management, and excellent service.   2 Product Demand The main electrical wiring diagram for this project is shown in Figure 1, and a total of the following two methods of self-provisioning logic need to be implemented: Fig.1 Electrical main wiring diagram Control method 1: # 0 and # 2 stations are put into operation, while # 1 station is not put into operation. During normal operation, 2QF is closed, 5QF is closed, 3QF, 4QF is disconnected, at this time, #2 station transformeroperates with two sections of busbar  (#1 station for emergency power, manual operation, 1QF default disconnection). When the automatic switching device for backup power supply detects the voltage, current and circuit breaker status at this time, after a certain delay, the backup self charging enters preparation state. When the voltage of the incoming line of the #2 station transformer is abnormal and the backup automatic switch detects that there is no voltage or current in the #2 station transformer, the incoming circuit breaker 2QF and the busbar circuit breaker 5QF of the #2 station transformer will be disconnected. Then, the backup automatic switch will close the circuit breakers 3QF and 4QF of the #0 station transformer. At this time, the #0 station transformer will bring two sections of busbar. When the incoming voltage of#2station transformer returns to normal and the automatic switching device for backup power supply detects the voltage of incoming line 2, the device is ready to charge and resume power supply from the #2 incoming line. After the charging is completed, the device will disconnect the QF3 and QF4 switches of the #0 station transformer circuit breaker, close the 2QF incoming circuit breaker and 5QF busbar circuit breaker of the #2 station transformer, and restore the entire section of the # 2 station. Control method 2: #1, #0, and #2 stations are put into operation. During normal operation: #1 station transformer incoming line with section I busbar, #2 station transformer incoming linewithsection II busbar, that is 1QF, 2QF are connected, 3QF, 4QF, 5QF are disconnected. When the backup automatic switching device detects the voltage, current and circuit breaker status at this time, after a certain delay, backup self charging enters preparation state. The incomingline1 voltage is abnormal and then returns to normal: When the voltage of the 1QF incoming line is abnormal and the automatic switching device for backup power supply detects that the # 1 station transformer has no voltage or current, the 1QF incoming line switch is disconnected, and then the 3QF switch of the # 0 station transformer is closed to supply power to thesection I busbar from the # 0 station transformer. (Among them, the 5QF busbar switch serves as a manual maintenance switch). When the automatic switching device for backup power supply detects that the incoming line 1 has returned to normal voltage, the backup power switch is ready to resume charging from the #1 incoming line. After charging is completed, disconnect the 3QF switch from the backup automatic switch, close the 1QF, and restore the I section busbar of the #1 station transformer. The incoming line 2 voltage is abnormal and then returns to normal: When the voltage of the 2QF incoming line is abnormal and the automatic switching device for backup power supply detects that the # 2 station transformer has no voltage or current, the 2QF incoming line switch is disconnected, and then the 4QF switch of the #0 station transformer is closed to supply power to thesection II busbar from the #0 station transformer. (Among them, the 5QF busbar switch serves as a manual maintenance switch). When the automatic switching device for backup power supply detects that the incoming line 2 has returned to normal voltage, the backup power switch is ready to resume charging from the incoming line # 2. After charging is completed, disconnect 4QF from the backup automatic switch, close 2QF, and restore the II section busbar of the # 2 station transformer. 3 Product Solutions There are a total of 3 station transformer incoming lines, 1 busbar, using a single busbar system, equipped with 2 AM5-DB low-voltage automatic switching protection device for backup power supply installed on the 3QF and 4QF cabinets for use. A secondary schematic diagram with interlocking relationship is drawn according to the power supply mode, and a special program is customized to achieve mutual switching of the main and backup power supplies, The design scheme for the back terminal of the device is as follows:     Fig. 2 Back terminal diagram of 2 AM5-DB low-voltage automatic switching device for backup power supply 4 On-site installation pictures The AM5-DB low-voltage automatic switching protection device for backup power supply of this project is installed on the low-voltage switchgear in local decentralized manner, and the site installation is shown in the following figure, the project has been put into use since 2023 and is running normally.   Fig.3 Installation picture of AM5-DB low-voltage automatic switching protection device for backup power supply   5 Conclusion The power supply in China mainly relies on the State Grid, and the power gap is constantly increasing, especially during peak electricity consumption periods when power shortages are severe. Therefore, many large enterprises have built their own power plants or equipped generators. The automatic switching device for backup power supply can ensure uninterrupted power supply and improve high reliability of power supply, and has become an important part of protection and control circuits in modern distribution engineering. The distribution project of Dongting 500kV substation introduced in this article uses AM5-DB low-voltage automatic switching protection device for backup power supply to provide corresponding protection functions for different power supply methods. Not only has it improved the reliability of power supply, achieved comprehensive automation of the entire distribution project, but it has also effectively reduced the labor intensity of workers. References: Acrel Enterprise Microgrid Design and Application Manual. Version 6 Acrel 35KV and the following substation intelligent power distribution system design and product secondary principle atlas.Version 2020.October Acrel Subscriber Substation Integrated Automation and Operation and Maintenance Solution.Version 2021.November  

Application of Active Filters in Biopharmaceutical Industry

Application of Active Filters in Biopharmaceutical Industry   Engineer: Lukas Lu  Tel: +86 18761593924   E-mail: lukas@email.acrel.cn Jiangsu Acrel Electrical MFG Co. Ltd   Abstract: With the widespread use of electronic devices, non-linear loads are increasing, which results in that the harmonic pollution in enterprise power grids is becoming more and more serious. Due to the adverse effects of harmonics, the quality of electricity is deteriorating, the additional losses increasing, the reliability of the power grid reducing, so that the normal operation of enterprise power supply and consumption equipment is affected, and even equipment is damaged to cause electrical faults. Based on the requirements and current situations of electricity safety, this paper analyzes the functions and effects of active filter devices in biopharmaceutical safety power supply systems.   Keywords: harmonic, power quality, active filter   Introduction Nowadays, a variety of power electronic devices are widely applied in the pharmaceutical enterprises, where rectifier devices accounted for a large proportion. Direct-current power supply required by the inverter and DC chopper, etc., is mainly from the rectifier circuit. The thyristor phase-controlled rectifier circuit or the diode rectifier circuit is the serious harmonic source. Although the single capacity of electrical equipment is small, the number is massive, most of which contains switching power supplies. Various types of switching power supplies and frequency converters are used more and more, together with the harmonics generated by fluorescent lamps, so that the harmonic pollution of the power supply is becoming more and more prominent. Grid harmonics make the voltage, current waveform distort, so that many abnormal phenomena and faults happens in the company’s power system and electrical equipment. Effective prevention to harmonics has become an important part of the safe operation of the enterprise power system. The active filter collects the harmonic current through CT, quickly calculating and extracting the content of each harmonic by CPU, and sends out instructions to make the power device to produce the compensation current of equal amplitude and opposite direction to the harmonic current, and injects it into the power grid so as to offset the harmonic current in the system.   Key features of power qualityin biopharmaceutical industry Biopharmaceutical industry has cluster development. Industrial cluster developmentis the inevitable trend in the future. Biopharmaceuticals is a combination of processes, which needs connection with various links, so the governance of power quality is particularly important. Once the equipment or power system failures, it leads to a linear decrease in economic benefits. 2.2 The main loads are pumps and motors driven by frequency converters. The main harmonic source is the frequency converter with a large content of harmonics, which requires a separate configuration of APF for harmonic management.       Harmonic sources in biopharmaceutical power supply and distribution system With the rapid development of the pharmaceutical industry, many advanced equipment came into being required by the pharmaceutical industry. There exist a large number of loads of pumps and motors, and many are equipped with frequency converters. The large number of applications of frequency converters make the harmonic content of the power distribution system greatly increase. At present, most of the frequency converters use 6 pulse rectification to convert AC current in to DC current, so the harmonics are mainly the 5th, 7th and 11th. At the same time, there are usually laboratories and automatic production lines in pharmaceutical enterprises with a large amount of precision devices, which in many cases are both generators and victims of harmonics. Harmonics will affect the normal work of the equipment in the laboratory, making the ongoing experiments lost; harmonics will also affect the intelligent controllers and PLC systems in automated production lines to make the automatic control equipment failure. Therefore, the harmonic problems of pharmaceutical enterprises has far-reaching impact and serious harm, which urgently need to be managed.   3.1 Research stations and laboratories In laboratories, a large number of sensitive equipment needs a clean grid environment to ensure the normal operation of the system, such as high-tech instruments, precision instruments and measuring equipment, switching power supplies, rectifier inverters, UPS / EPS, etc., which are also larger harmonic sources. Laboratories and other places where there are a large number of switching power supply loads will produce significant 3rd, 5th and 7th harmonics, where we should pay special attention to the affect of 3rd harmonic current on the neutral line.   3.2 Automatic production lines Fermentation is an important part of the production of API, which is made by the fermenter. With the continuous expansion of product output, updating of new processes and increasing of new varieties, there are different requirements of the control of the fermenter, stirring frequency and time period adjustments. For the situations with heavy loads, large power consumption, long fermentation cycle, in recent years the fermentation production enterprises have also taken a variety of methods to carry out equipment renovation. Frequency control can both meet the requirements of the production process and reduce consumption. However, with the continuous improvement of the automation, power pollution by automation equipment is also getting worse and worse. The corresponding interference with the automatic control system is also getting stronger and stronger. The requirements on the power supply filtering and purification to obtain a relatively stable and green power supply are also getting higher and higher.   Practical case Take a biopharmaceutical power quality management project in Shandong Province as an example, according to the feedback from the person in charge of the plant, frequent tripping phenomenon occurs in the comprehensive office building of the plant, and the reactor in the capacitor cabinet of the production workshop appears to be burnt and the N-wire cable is overheated. The main reason is expected to be the fact that there are many loads of inverter air-conditioning, computer and communication equipment, LED lighting, pumps and others in the comprehensive office building and the production workshop, which will generate harmonics and affect the entire power supply and distribution system. Now it’s necessary to measure the distribution rooms of the comprehensive office building and production workshop, and to give the appropriate solution according to the corresponding power quality data. 4.1 Harmonic measurement data in the distribution room of the comprehensive office building   Harmonic measurement data in the distribution room of the comprehensive office building   current current distortion rate harmonic content 3rd harmonic 5th harmonic 7th harmonic A 346A 22.3% 77.16A 29.4A 58.9A 35.9A B 323A 20.8% 67.18A 16.4A 55.7A 29.4A C 320A 22.6% 72.32A 21.7A 57.1A 35.2A     4.2 Harmonic measurement data in the distribution room of the production workshop Harmonic measurement data in the distribution room of the production workshop   current current distortion rate harmonic content 3rd harmonic 5th harmonic 7th harmonic A 152.71 88.03% 134 78.1 52.85 32.54 B 130.14 81.9% 106 63.56 42.39 27.81 C 155.84 83.54% 130 78.56 51.99 30.52 N 220.74     223.1       From the above two sets of measurement data, it can be concluded that the harmonics of the comprehensive office building are mainly 5th and 7th and the current distortion rate is up to 22%. The 5th and 7th harmonics can be centrally managed in the distribution room to eliminate the harmonic impact on the entire power supply and distribution system, transformers, capacitor cabinets, and other electricity equipment, so as to ensure the normal production of biopharmaceuticals. The harmonics of the production workshop distribution room are more serious, where the 3rd and 5th harmonics have exceeded the national GB/T14549-1993 "harmonics in public supply network" 0.38KV system harmonic current value standard. On-site capacitor cabinets are connected in series with 7% reactance. The 3rd and 5th harmonics flow into the capacitor cabinet, and the harmonic current is superimposed on the fundamental current of the capacitor, which makes the capacitor's operation current become larger and the temperature rises, leading to overheating and reduces the service life of the capacitor or causes the capacitor to be damaged. The active filter devices can be used to solve these problems, which adopt DSP+FPGA all-digital control method and are connected in parallel in the system. They can fully compensate for the 2nd to 51st harmonics or compensate for specific harmonics, eliminate harmonics in the system to prevent damages to the N line, and protect the circuits against the fire.       Conclusion With the introduction and deepening of modern production processes, power equipment and other advanced scientific means, a large number of nonlinear power electronic equipment emerges, which improves the quality of biopharmaceuticals, but also brings a severe impact on the power quality of the power supply and distribution system of the entire plant at the same time, especially the scientific research laboratories, where the loads are diverse and the harmonic generation and changes have a great randomness and complexity. By studying the power quality of the supply and distribution system in biopharmaceutical buildings and proposing a reasonable solution in conjunction with the system platform, the quality of power supply in biopharmaceuticals can be improved as well as the safe and economic operation of the grid and the energy consumption can be reduced.   References: [1] Acrel Enterprise Microgrid Design and Application Manual. Version 2022.05