Sub-parts Control Parameter Fitting Method of VSC Based on RTDS

doi:10.12096/j.2096-4528.pgt.19079

Abstract

Abstract:

Voltage source converter (VSC) is the main power electronic components of wind power, photovoltaic and converter stations. It's control mode and parameter setting have important influence on system operation. Based on real time digital simulator (RTDS) hardware-in-loop simulation and digital simulation, a new method of parameter fitting applied to characterize physical VSC was proposed. Taking a typical single VSC grid connected system model as an example, firstly, based on the principle of phase-locked loop (PLL), an adaptive observation coordinate system was proposed to compare and fit the step response of two simulation models. Then the fitting methods of PLL, current inner loop and DC voltage outer loop in VSC control system were introduced separately. Self-adaptive observational coordinate system was used in the process of current inner loop parameter fitting. Finally, the efficiency of the proposed method was verified by the comparative analysis of simulations.

Key words: voltage source controller (VSC), parameter fitting, self-adaptive observation coordinate system, phase-locked loop (PLL)

CLC Number:

TK01
TM461

Peng XU, Jianbin MI, Xiaofei MENG, Huan XIE. Sub-parts Control Parameter Fitting Method of VSC Based on RTDS[J]. Power Generation Technology, 2020, 41(6): 667-674.

Figures/Tables 17

Fig.1 Primary diagram of grid-connected system

Fig.2 Primary diagram of VSC Parameter Fitting Simulation Model

Fig.3 Three-phase SRF-PLL

Fig.4 Space vector map of SRF-PLL

Fig.5 PLL model diagram

Fig.6 Simulation model diagram of observation axis

Fig.7 Decoupling control model of current inner loop

Fig.8 Model diagram of generating stepped disturbance signal

Fig.9 Intervention mode of current disturbance signal

Fig.10 Measurement of step response of current disturbance

Fig.11 Model diagram of DC voltage outer control loop

Tab. 1 PPL parameter fitting test scheme

模型参数结构	阶跃试验
直流侧用恒电压源等效，正负电压幅值为0.560 8 kV	等值交流电压源幅值上下10%阶跃
交流侧系统电感为5.43×10^-5 H	等值交流电压源幅值上下10%阶跃

Fig.12 Comparison of simulation results when equivalent AC voltage resource amplitude gets 10% upper step

Tab. 2 Current loop parameter fitting test scheme

模型参数结构	阶跃试验
直流侧用恒电压源等效，正负电压幅值为0.560 8 kV	I_q由0到?0.2下阶跃
交流侧系统电感为5.43×10^-5 H
利用观测轴坐标系引入电流阶跃偏差量

Fig.13 Comparison of simulation results when Iq turns to-0.2 from 0

Tab. 3 Voltage loop parameter fitting test scheme

模型参数结构	阶跃试验
直流侧用电流源(电压源串联大电阻的形式)等效	直流侧电流I_dc由0到0.3阶跃
交流侧系统电感为5.43×10^-5 H	直流侧电流I_dc由0到0.3阶跃

Fig.14 Comparison of simulation results when Idc turns to 0.3 from 0

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