Dynamic Discrete Equivalent Model of Photovoltaic Power Generation System

doi:10.16183/j.cnki.jsjtu.2021.505

Abstract

Abstract:

The proportion of renewable energy in the new power system is further increased, and the grid connected capacity of photovoltaic units has a trend of obvious improvement. The dynamic behavior of the photovoltaic (PV) power generation system at different permeabilities has a significant impact on the load characteristics of the power grid. However, the complex dynamic model of photovoltaic power generation grid connection and the large number of parameters to be identified increase the difficulty of practical application of the model. Therefore, a dynamic discrete equivalent model of the PV power generation model based on the physical model of the PV power generation model is established, and the parameters of the dynamic discrete equivalent model for the PV power generation model are obtained. The IEEE 14-bus system, which is subject to various PV permeabilities, is adopted to verify the superb dynamic characteristics of the proposed discrete equivalent model for the PV power generation in power system simulations. The pertinent simulation results show that the dynamic discrete equivalent model of the PV power generation system can accurately describe the dynamic characteristics of the PV power generation system with a high accuracy and an easy identification performance.

Key words: photovoltaic (PV), dynamic equivalence, various permeabilities, parameter identification

CLC Number:

TM715

LIU Kezhen, CHEN Xueou, CHEN Leidan, LIN Zheng, SHEN Fu. Dynamic Discrete Equivalent Model of Photovoltaic Power Generation System[J]. Journal of Shanghai Jiao Tong University, 2023, 57(4): 412-421.

Figures/Tables 14

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Fig.2

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Fig.4

Tab.1

Fig.5

Fig.6

Fig.7

Fig.8

Tab.2

Fig.9

Fig.10

Tab.A1

Identification results of current real part parameters in three-phase fault

渗透率/%	电压跌落/%	θ_α₁	θ_α₂	θ_α₃	θ_α₄	θ_α₅	$∑ i = 1 5$ θ_αi	θ_α₆	θ_α₇	θ_α₈	θ_α₉	$∑ i = 6 9$ θ_αi
0	3	2.1553	-2.1487	1.4263	-0.5645	-0.2692	0.6001	0.6795	-0.6389	0.4571	-0.1850	0.3127
0	5	2.2664	-2.3475	1.5473	-0.5854	-0.2896	0.5912	0.7701	-0.7750	0.5368	-0.2060	0.3259
60	3	1.8282	-1.4017	0.8280	-0.3939	-0.1782	0.6824	0.5087	-0.3609	0.1878	-0.0519	0.2837
60	5	1.8644	-1.4669	0.8745	-0.4106	-0.1944	0.6670	0.5544	-0.4232	0.2256	-0.0639	0.2929

Tab.A1

Tab.A2

Identification results of virtual part of current in three-phase fault

渗透率/%	电压跌落/%	θ_β₁	θ_β₂	θ_β₃	θ_β₄	θ_β₅	$∑ i = 1 5$ θ_βi	θ_β₆	θ_β₇	θ_β₈	θ_β₉	$∑ i = 6 9$ θ_βi
30	3	1.2533	-0.5739	0.6167	-0.4172	0.1268	1.0057	-0.0533	0.0618	0.0724	-0.0086	0.0723
30	5	1.3851	-0.8603	0.8250	-0.4791	0.1479	1.0186	-0.1631	0.2012	-0.0281	0.0354	0.0454
60	3	1.2803	-0.9183	1.0121	-0.5162	0.05237	0.91027	0.0469	0.3631	-0.1369	-0.0732	0.1999
60	5	1.3367	-0.9657	0.9922	-0.5025	0.0496	0.9103	-0.0009	0.4329	-0.2098	-0.0419	0.1803

Tab.A2

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参数	取值
开路电压V_oc/V	44.5
短路电流I_sc/A	8.20
最佳工作电压V_m/V	35.5
最佳工作电流I_m/A	7.51
串联数量/个	300
并联数量/个	200
组件转换效率/%	16.90

步长/s	渗透率/%	电压跌落/%	实部拟合残差	虚部拟合残差
0.001	30	3	1.099×10^-4	1.502×10^-4
0.001	30	5	2.044×10^-4	2.647×10^-4
0.001	60	3	1.056×10^-4	1.003×10^-4
0.001	60	5	2.089×10^-4	2.389×10^-4
0.002	30	3	1.517×10^-4	9.681×10^-5
0.002	30	5	2.292×10^-4	1.926×10^-4
0.002	60	3	8.541×10^-5	8.792×10^-5
0.002	60	5	1.535×10^-4	2.154×10^-4