Research on Control Method of Medium Voltage Direct-mounted Energy Storage Converter under Non-ideal Grid Conditions

doi:10.11985/2022.01.018

Abstract

Abstract:

Aiming at the problems of grid-connected H-bridge photovoltaic inverter grid-connected current distortion and high low-order harmonic content caused by non-ideal grid voltage conditions, the control strategy of energy storage converter of cascaded H-bridge under the condition of non-ideal grid is studied. First, the topology and mathematical model of the three-phase cascaded H-bridge energy storage converter are analyzed and introduced. Secondly, on the basis of quasi-proportional integral-harmonic resonance(PI-HR) regulator, when the grid voltage is unbalanced and harmonic- pollution, the dual current closed-loop control system under the synchronous rotating coordinate system is established, a specific control structure block diagram is given, and considering the stability of the system, the phase margin, amplitude margin, and fundamental frequency gain of the system are taken as the stability constraint conditions, the constraint equations for the controller parameters are established. Finally, a Matlab/Simulink simulation model of three-phase cascaded H-bridge multilevel energy storage converter system is built. Simulation analysis verifies the correctness and effectiveness of the control strategy designed in this paper.

Key words: Cascaded H-bridge, energy storage converter, non-ideal power grid, low-order harmonics, PI-HR regulator

CLC Number:

TM464

LI Gaoning, LÜ Jianguo, YE Shankun, YAO Kai, SUN Zhuang. Research on Control Method of Medium Voltage Direct-mounted Energy Storage Converter under Non-ideal Grid Conditions[J]. Journal of Electrical Engineering, 2022, 17(1): 137-147.

Figures/Tables 18

References 23

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S_1,1	S_1,2	${{\bar{S}}_{1,1}}$	${{\bar{S}}_{1,2}}$	输出电压
1	0	0	1	V_dc
0	1	0	1	0
1	0	1	0	0
0	1	1	0	-V_dc

参数	数值
系统总功率/MW	2
电网相电压幅值/V	8 165
H桥直流侧电压/V	960
每相H桥单元个数	12
滤波电感L/mH	12
采样频率/kHz	20
电网-5次谐波相电压幅值/V	816.5
电网+7次谐波相电压幅值/V	408.25