Research on the Method of Photovoltaic Participation in Grid Frequency Regulation Based on Model Prediction Control

doi:10.11985/2023.03.037

Abstract

Abstract:

Aiming at the problem of insufficient primary frequency regulation ability of the power system caused by large-scale photovoltaic grid connection, photovoltaics actively participate in grid frequency regulation is an important means to solve this problem. Firstly, the topology structure and control strategy of two-stage photovoltaic power generation system are introduced. Then, considering that droop control has limited effect on frequency transient regulation of power grid, a frequency regulation control strategy combining model predictive control and droop control is proposed. On the basis of active power reserve, the strategy changes the output increment of droop control by frequency difference and the output increment of model predictive control by frequency deviation rate, so as to change the output power of photovoltaic power generation and make it participate in system frequency regulation. Finally, a simulation model of a regional grid with PV power generation is built on Matlab/Simulink platform, the feasibility and effectiveness of the frequency regulation control strategy are verified. The simulation results show that the control strategy not only regulates the steady state of grid frequency, but also improves the transient and dynamic effects of grid frequency.

Key words: Two-stage photovoltaic power generation system, frequency regulation, droop control, model predictive control

CLC Number:

TM761

WU Fuyun, CHENG Wei, LI Gaoning, LÜ Jianguo. Research on the Method of Photovoltaic Participation in Grid Frequency Regulation Based on Model Prediction Control[J]. Journal of Electrical Engineering, 2023, 18(3): 348-357.

Figures/Tables 21

References 24

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调频类型	优点	缺点
减载控制	不需要额外设备，调频成本较低	一般需要弃光，有能量损失
虚拟同步控制	提供更好的惯性，改善动态特性	通常与储能结合，忽略光伏源端特性
光储联合控制	功率稳定，消除功率波动	储能单元的造价与维护成本昂贵

参数	数值
区域1发电机容量/MW	198
区域2发电机容量/MW	198
光伏容量/MW	125
负载消耗有功功率/MW	480
有功备用δ	0.2
转动惯量J	0.1
阻尼系数D	10
Boost 电压环的PI参数	(1, 100)
调频电压环的PI参数	(0.2, 100)
逆变器无功功率外环的PI参数	(7, 800)
逆变器有功功率外环的PI参数	(7, 800)
逆变器有功电流内环的PI参数	(0.3, 20)
逆变器无功电流内环的PI参数	(0.3, 20)
输出量权重系数q	100
控制量权重系数r	1