In the current era of accelerated transformation of the energy structure and vigorous development of distributed energy, microgrids, as an effective carrier integrating distributed power sources, energy storage and loads, have become a key link in building a new type of power system. Shanghai Baiqi Qianlian Technology Group Co., Ltd. has a deep understanding of industry trends and actively engages in the research and application of distributed AC and DC power systems in the microgrid field, dedicated to providing customers with efficient and reliable energy solutions.
It has broad application prospects and is in line with the new trend of energy development
(1) Flexibly adapt to the access of diverse distributed power sources
There are various types of distributed energy. Dc power sources such as photovoltaic and wind power coexist with traditional AC power generation equipment. The distributed AC/DC power supply system can be seamlessly connected to various power sources. Photovoltaic and energy storage batteries can be directly connected to the DC subnet, while AC fans and diesel generators are connected to the AC subnet, reducing unnecessary power conversion links. For instance, in a microgrid project on an island rich in distributed energy, through the distributed AC and DC power supply system provided by "Hundred Enterprises and Thousand Connections", a 5MW photovoltaic array, a 2MW wind turbine and a 1MW energy storage system were successfully integrated, achieving efficient energy aggregation and flexible allocation, with a new energy consumption rate of over 95%.
(2) Significantly enhance power supply reliability and power quality
By adopting a distributed architecture, each power module operates relatively independently, and the impact range of a single point of failure is greatly reduced. When there is a power failure in some areas, other areas can still be supplied with power normally, maintaining the operation of critical loads. Meanwhile, the system is equipped with real-time monitoring and rapid adjustment capabilities, which can precisely compensate for voltage fluctuations and suppress current harmonics, ensuring power quality. After a certain data center adopted a distributed AC/DC power supply system, the power supply interruption time was reduced from an average of 2 hours per year to less than 10 minutes, the voltage deviation was controlled within ±1%, and the harmonic content was lower than 3%, effectively ensuring the stable operation of the data center.
(3) Adapt to the development needs of "plug and play" in microgrids
With the popularization of distributed energy, the scale of microgrids is constantly expanding, and new power sources and loads are frequently connected. The distributed AC/DC power supply system supports the "plug and play" function. Through intelligent control and communication technology, it can automatically identify and quickly form a network when new devices are connected, achieving power balance and coordinated control. In a microgrid upgrade project of a certain industrial park, the newly added distributed photovoltaic and energy storage equipment, after being connected to the power supply system of "Hundred Enterprises and Thousand Connections", completed automatic debugging and grid connection operation within 15 minutes, significantly shortening the project construction period and reducing the complexity of operation and maintenance.
(4) Promote efficient energy utilization and economic operation
The system can intelligently optimize energy allocation based on real-time electricity prices, load changes and power output conditions. During the off-peak electricity price period, low-priced electricity is used to charge energy storage or operate high-power equipment. During peak hours, prioritize the use of energy storage and distributed power sources to reduce the purchase of electricity at high prices. In this way, the cost of electricity can be effectively reduced. After verification by actual projects, it was found that after a certain commercial complex applied this system, its annual electricity bill was reduced by more than 20% and its energy utilization efficiency was improved by 15%.
The road ahead is fraught with challenges and urgently requires breakthroughs in technological innovation
(1) Complex system coordination and control challenges
The distributed AC/DC power supply system involves multiple power sources, energy storage and load units. The power interaction between AC and DC subnets is frequent, and it is necessary to precisely coordinate the operating status of each part. However, different power sources have distinct characteristics. The output of photovoltaic power is affected by sunlight, and wind power is intermittent. Coupled with the dynamic changes in load, traditional control strategies are difficult to meet the requirements of real-time and precise control. Developing advanced distributed collaborative control algorithms to achieve efficient coordination among various units has become an urgent task. Shanghai Baiqi Qianlian is relying on its independently developed intelligent control system, integrating artificial intelligence and big data analysis technologies, to build an adaptive control model to cope with complex and changeable operating conditions.
(2) Challenges in communication reliability and real-time performance
Distributed power sources, energy storage and loads are widely distributed, and the system relies on communication networks to achieve information interaction and collaborative control. However, in practical applications, communication failures and signal delays occur from time to time, affecting the stability of the system and control accuracy. Especially in remote areas or harsh environments, communication problems are more prominent. To solve this problem, Bai Qi Qian Lian, on the one hand, adopts a redundant communication architecture, combining multiple communication methods such as wireless and wired to ensure reliable communication links; On the other hand, optimize the communication protocol, reduce the data transmission delay and improve the system response speed.
(3) Issues regarding the stability and lifespan of power electronic equipment
Distributed AC/DC power supply systems extensively employ power electronic converters. During long-term operation, they are prone to be affected by temperature changes and voltage and current surges, leading to equipment failure and shortened lifespan. For instance, the power devices in the converter, under the high-frequency switching action, generate severe heat, accelerating the aging of the devices. For this reason, Bai Qi Qian Lian selects high-quality and highly reliable power electronic components in equipment selection, optimizes the heat dissipation design, and adopts an intelligent temperature control system to ensure that the equipment operates within a stable temperature range. Meanwhile, through fault prediction and health management technologies, potential fault hazards can be detected in advance, timely maintenance can be carried out, and the service life of equipment can be prolonged.
(4) High initial investment costs
Compared with traditional centralized power supply systems, distributed AC and DC power supply systems have a greater variety and quantity of equipment, and require intelligent monitoring and communication facilities, which leads to a higher initial investment cost. This has to some extent restricted its large-scale promotion and application. Through optimizing system design, the "Hundred Enterprises and Thousand Connections" initiative enhances equipment integration and reduces equipment costs. At the same time, establish long-term cooperative relationships with suppliers to obtain more favorable purchase prices. In addition, from the perspective of long-term operational benefits, we provide detailed calculations for customers on the hidden benefits brought by energy-saving gains and reliability improvements, helping them balance costs and benefits and promoting the implementation of projects.
Although distributed AC/DC power supply systems face many challenges in the field of microgrids, their broad application prospects cannot be ignored. Shanghai Baiqi Qianlian Technology Group Co., LTD., relying on its professional technical team and rich practical experience, has been continuously delving into technological innovation, making every effort to solve problems, and safeguarding the wide application of distributed AC and DC power supply systems in microgrids, helping the energy industry take big steps towards being clean, efficient and reliable. If you are interested in the application of distributed AC/DC power systems in microgrids, please feel free to contact us at any time. Let's join hands to create a green energy future together.
