Operation Condition Emulation Method for Grid-Connection Testing of Grid-Forming Photovoltaic Inverters

doi:10.16628/j.cnki.2095-8188.2025.11.010

Abstract

Abstract:

Grid-forming control technology provides an effective solution for improving the dynamic stability of power grids by simulating the inertia characteristics of synchronous machines through converter control systems.In photovoltaic inverters,the inertia simulation is achieved by controlling the DC voltage and utilizing the energy stored in the DC capacitor.Conventional grid simulators often focus on AC-side grid characteristics ignoring the impact of the DC-side power source for photovoltaic inverters,which makes it unable to meet the testing requirements for AC-DC coordinated control strategies of grid forming photovoltaic inverters.An innovative scheme for an AC-DC dual-port operating condition simulation test platform is proposed.By synchronously simulating the AC-side grid voltage,frequency and impedance characteristics,as well as the DC-side photovoltaic power generation dynamic characteristics, a full-condition simulation method for grid-connected testing of grid-forming photovoltaic inverters is constructed.

Key words: grid-forming photovoltaic inverter, operation condition simulation, grid simulation, generator-side simulation

CLC Number:

TM464

LI Xinqiang, WANG Zhong, WANG Jiashi. Operation Condition Emulation Method for Grid-Connection Testing of Grid-Forming Photovoltaic Inverters[J]. LOW VOLTAGE APPARATUS, 2025, 0(11): 72-77.

Figures/Tables 11

References 20

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参数	数值	备注
直流电容 C_dc/μF	2 200	基于电压波动抑制要求,由式(7)计算
线路电感 L_line/mH	10	参考典型低压配电网参数(L/R≈10)^[15]
线路电阻 R_line/Ω	1	参考典型配电网电阻参数(L/R≈10)
惯量系数 J/(kg?m²)	0.1	根据电网频率响应要求(时间常数≈0.5 s)设计
有功阻尼系数 D_p/(N?m?s?rad^-1)	5	参考文献[6]中稳定性判据(确保特征值实部为负)
低通滤波器时间常数T/s	0.01	抑制高频噪声同时保证相位延迟<5°(50 Hz时)
额定直流电压 u_dc/V	750	—
直流电压给定值U_dcref/V	750	—
直流额定有功功率P_n/kW	20	—
交流电网电压幅值给定值U₀/V	311	—
交流电网电压频率给定值f₀/Hz	50	—