光伏发电系统动态离散等值模型研究

doi:10.16183/j.cnki.jsjtu.2021.505

摘要/Abstract

摘要：

可再生能源在新型电力系统中的占比进一步加大,光伏机组并网容量有明显提升的趋势,而不同渗透率下的光伏发电系统动态行为对电网负荷特性产生显著影响,但光伏发电并网动态模型复杂、待辨识参数多,增大了模型实际运用难度.为此,基于光伏电站机理模型,建立光伏发电并网系统的动态离散等值模型,得到光伏发电并网系统的动态离散等值模型的模型参数;并采用IEEE 14节点系统研究不同渗透率下光伏发电并网系统的动态离散等值模型特性.仿真结果表明,光伏发电并网系统的动态离散等值模型能准确描述光伏发电系统的动态特性,且精度高、易于辨识.

关键词: 光伏发电, 动态等值, 不同渗透率, 参数辨识

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

中图分类号:

TM715

刘可真, 陈雪鸥, 陈镭丹, 林铮, 沈赋. 光伏发电系统动态离散等值模型研究[J]. 上海交通大学学报, 2023, 57(4): 412-421.

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.

图/表 14

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图2

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表1

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表2

图9

图10

表A1

三相短路接地故障下电流实部参数辨识结果

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

表A1

表A2

三相短路接地故障下电流虚部参数辨识结果

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

表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