Abstract
Aiming at the independent AC/DC microgrid, a simple and effective multi time scale control strategy is proposed by adopting the combination of day ahead scheduling and real-time control. The day ahead scheduling strategy takes the minimum operation cost of AC/DC microgrid as the goal, and schedules the controllable loads in the AC/DC microgrid with particle swarm optimization, which makes full use of renewable energy. The real-time control strategy controls the output of the distributed generation, the load reduction and the switching of the diesel generator according to the real-time energy storage state of charge (SOC), which keep the power balance of the AC/DC microgrid. The effectiveness of the proposed two-level control strategy is verified by a practical AC/DC hybrid microgrid. The results show that the proposed method can make full use of renewable energy and ensure the economic and reliable operation of AC/DC hybrid microgrid.
Highlights
The microgrid composed of photovoltaic, energy storage, diesel generator and other equipment has the advantages of making full use of renewable energy and providing independent power supply for users, which is suitable for supplying power to users in areas where the construction of power facilities is difficult, such as islands and mountainous areas[1,2]
Compared with the traditional single AC microgrid or DC microgrid, AC/DC hybrid microgrid has the advantages of convenient DC load access, high acceptance capacity of distributed generation, flexible and diverse networking form and control mode[3], which can improve the level of system security and stability and reduce network loss [4, 5]
In reference [13], the island independent microgrid system adopts the method of time-to-time control, and the system scheduling strategy is formulated with the constraints of system active power balance and normal operation of equipment
Summary
According to the load characteristics and power supply requirements, it can be divided into four categories: fixed load, reducible load, translatable load and flexible load. Fixed Load: This type of load cannot be regulated by the power system, cannot be reduced or shifted, and its demand must be met. Reducible Load: This type of load can increase or decrease the power consumption within a certain period of time according to the needs of system regulation. Translatable Load: This type of load can be transferred according to the needs of system regulation and control, but it must be completed within a certain time. Flexible Load: This type of load belongs to non-essential load, its power consumption and power consumption period can be adjusted according to the needs of system regulation, and can be stopped when necessary.
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