In view of the problem that the equivalent inertia and frequency modulation capability of the receiving power grid are constantly reduced due to large-scale renewable energy access, and the frequency stability of the receiving power grid is seriously affected, this paper proposes an optimal control method for frequency stability of the receiving power grid considering energy storage support. Firstly, the frequency response characteristics of multi-source energy storage in the receiving power grid are analyzed. Secondly, the relationship between multi-energy energy coordination and frequency change based on multi-source energy storage is analyzed, a frequency support characteristic model considering multi-energy energy storage sup-port is established, and the equivalent model of the frequency response of the receiving-end power grid based on multi-energy coordination is modified. Then, the frequency change speed index and frequency drop index of the receiving power grid are established as the frequency stability index, and an optimal control method for frequency stability of the receiving-end power grid based on multi-source energy storage support is proposed. Finally, a simulation model is established by taking an actual receiving-end power grid as an example. The results of the example verify the validity of the model in this paper. Based on the multi-energy energy storage support, the frequency stability performance of the receiving-end power grid can be improved.
The innovations of this paper are as follows :
(1) In this paper, the response characteristics of multi-source energy storage equipment to frequency through virtual inertia control are analyzed, and the frequency control model of multi-source energy storage inertia support is established.
(2) The internal response considers the response of the prime mover and the governor when the active power adjustment is considered, and the external response is equivalent using the parameter identification method. On this basis, a frequency response model of receiving-end power grid considering multi-source energy storage support is established.
(3) Taking the frequency change speed index and frequency drop index of the receiving-end power grid as the frequency stability index, the frequency stability optimization control method of the receiving-end power grid based on multi-source energy storage support is proposed. An improved quantum particle swarm optimization algorithm is proposed to solve the frequency stability control of the receiving-end power grid. Finally, the simulation model is established by taking the actual receiving-end power grid in East China as an example. The results of the example verify the effectiveness of the model in this paper.
The following conclusions can be drawn from the simulation analysis: (1) The characteristics of multi-energy storage in the receiving-end power grid are analyzed, and the frequency control response models of electric vehicles, P2H, P2G equipment and electric vehicles are analyzed. (2) The support characteristics of the system based on multi-energy energy coordination and multi-source energy storage are analyzed. The frequency response model of the receiving-end power grid considering multi-source energy storage is proposed, and the frequency stability optimization control model of multi-source energy storage is established. (3) A frequency stability index is established, which is composed of the frequency change speed index and the frequency drop index of the receiving power grid, and the virtual inertia control of multi-source energy storage is used for frequency regulation. The simulation results show that the model can effectively improve the frequency characteristics of the receiving end power grid, and the proposed frequency response model has high accuracy. (4) The frequency modulation optimization control method based on multi-source energy storage in this paper can make full use of the rotor kinetic energy, reasonably adjust the system inertia, and improve the frequency modulation ability of the receiving end system.
张怡静, 李智, 时艳强, 丁浩寅, 张文朝. 基于储能惯量支撑的受端电网频率优化控制方法[J]. 电工技术学报, 0, (): 230466-.
Zhang Yijing, Zhi Li, Shi Yanqiang, Ding Haoyin, Zhang Wenchao. Optimal Frequency Control Method of Receiving Power Grid Based on Energy Storage Inertia Support. Transactions of China Electrotechnical Society, 0, (): 230466-.
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