Aggregation Modelling of Grid-Forming Renewable Power Plant for Frequency and Voltage Dynamic Analysis

doi:10.16183/j.cnki.jsjtu.2023.061

Abstract

Abstract:

Renewable power plant based on the grid-forming converter has a similar performance with the traditional thermal power plant on the function of active support for the frequency and voltage in the power system. An aggregation model is proposed for the frequency and voltage stability analysis of new power system, the overall operation characteristics of the plant are analyzed, and a method for identifying and selecting the parameters of the aggregation model is proposed. The proposed aggregation model can accurately reflect the dynamic process of the interaction between the renewable power plant and the grid, and ensure a quick simulation rate. In comparison with the electromagnetic transient model for grid-forming renewable power plant, the effectiveness of the proposed aggregation model is verified in MATLAB/Simulink. The accuracy and rapidity of the proposed aggregation model is verified in the frequency and voltage stability simulation analysis of power system based on the case study in the IEEE 39 bus system.

Key words: grid-forming converter, renewable power plant, aggregation model, system stability

CLC Number:

TM743

GE Chenchen, CHEN Junru, XU Sen, CHANG Xiqiang, MAO Shanxiang, ZHU Rongwu. Aggregation Modelling of Grid-Forming Renewable Power Plant for Frequency and Voltage Dynamic Analysis[J]. Journal of Shanghai Jiao Tong University, 2024, 58(10): 1544-1553.

Figures/Tables 11

Fig.1

Fig.2

Tab.1

Parameters of grid-forming renewable unit and aggregation model (single-machine infinite system)

单元	M_p.u.	D_p.u.	$K d p . u .$	$K v p . u .$	$X g p . u .$
单元一	0.1571	15.7080	4.9951	0.5000	0.1280
单元二	0.0942	25.1327	4.9951	0.5000	0.1280
单元三	0.0628	25.1327	4.9951	0.5000	0.1280
聚合模型	0.3142	68.1726	14.9854	0.4984	0.0427

Tab.1

Fig.3

Fig.4

Fig.5

Fig.6

Tab.2

Parameters of grid-forming renewable unit and aggregation model parameters (closed-loop system)

单元	$P p . u . *$	M_p.u.	D_p.u.	$K d p . u .$	$K v p . u .$	$L g p . u .$
NE1~NE3	80	10.00	200	30.0	0.9	0.0600
NE4~NE6	100	9.00	100	20.0	0.9	0.0900
NE7~NE10	125	8.25	225	7.5	0.9	0.0400
类型一聚合	240	30.00	600	90.0	0.9	0.0200
类型二聚合	300	27.00	300	60.0	0.9	0.0300
类型三聚合	460	33.00	900	30.0	0.9	0.0100
全部聚合	1 000	90.00	1800	180.0	0.9	0.0055

Tab.2

Tab.3

Fig.7

Fig.8

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模型	电网频率事件仿真时间/s	电网电压事件仿真时间/s
全模型	24.335	24.8850
同类聚合模型	20.182	21.7243
整场聚合模型	15.569	17.2028