渝鄂柔性直流输电接入电网高频谐振与抑制分析

doi:10.12096/j.2096-4528.pgt.21131

摘要/Abstract

摘要：

针对渝鄂柔性直流输电(voltage source converter based high voltage direct current transmission，VSC-HVDC)南通道渝侧接入交流电网产生的系统高频谐振，应用阻抗分析法对影响系统稳定的柔性直流输电换流器特性进行了分析。利用渝鄂柔性直流输电换流器和交流线路参数，建立了换流器和交流线路阻抗的数学模型。应用MATLAB进行了仿真计算，得到换流器和交流线路的阻抗幅频、相频特性。对渝鄂柔性直流输电南通道渝侧二次高频振荡进行了深入剖析，找到了引起高频振荡的原因。最后，提出了渝鄂柔性直流输电高频振荡抑制策略，通过PSCAD仿真计算验证了抑制策略的正确性。

关键词: 柔性直流输电(VSC-HVDC), 高频谐振, 阻抗分析法, 抑制策略, 仿真计算

Abstract:

In view of the high frequency resonance generated by Yu side connected to the AC grid in the Yu to E voltage source converter based high voltage direct current transmission (VSC-HVDC) south channel project, the characteristics of VSC-HVDC converter affecting the system stability were analyzed with the impedance analysis method. Mathematical model of the converter and AC line equivalent impedance was established by using the parameters of the converter and AC lines in Yu to E VSC-HVDC project. The impedance amplitude-frequency characteristics and phase-frequency characteristics of the converter and AC lines were obtained by applying MATLAB simulation calculation. The twice cases of high-frequency resonance in Yu side of the Yu to E back-to-back (BTB) VSC-HVDC south channel project were carried out in-depth analysis, and the cause of high frequency resonance was found by the analysis result. Finally, the high frequency resonance suppression strategy was put forward in Yu to E BTB VSC-HVDC project, and was verified by PSCAD simulation calculation.

Key words: voltage source converter based high voltage direct current transmission (VSC-HVDC), high frequency resonance, resistance analysis method, suppression strategy, simulation calculation

中图分类号:

TM 72

杨万开, 王兴国, 王书扬. 渝鄂柔性直流输电接入电网高频谐振与抑制分析[J]. 发电技术, 2022, 43(3): 492-500.

Wankai YANG, Xingguo WANG, Shuyang WANG. Analysis of High Frequency Resonance and Suppression in Yu to E VSC-HVDC Project Connected to Power Grid[J]. Power Generation Technology, 2022, 43(3): 492-500.

图/表 16

图1 换流器接入电网等效阻抗电路图

Fig. 1 Equivalent impedance circuit of grid-connected converters

图2 简化条件下换流器的控制框图

Fig. 2 Control diagram of converter under simplified condition

表1 渝鄂背靠背柔直南通道系统参数

Tab. 1 Parameters of Yu-E south channel

系统参数	取值
系统参数	渝侧	鄂侧
额定有功功率/MW	1 250	1 250
交流系统电压/kV	525	525
额定直流电流/A	1 488	1 488
变压器短路比/%	14	14
桥臂电抗/mH	140	140
电流环PI控制器比例(积分)系数	0.28(1/0.06)	0.28(1/0.06)
采样延时T_sd/s	50	50
系统延时T_td/s	500	350
采样时间T_s/s	100	100
工频周期T/s	0.02	0.02

图3 换流器阻抗的幅频特性

Fig. 3 Magnitude-frequency characteristics of converter impedance

图4 换流器阻抗相频特性

Fig. 4 Phase-frequency characteristics of converter impedance

图5 交流线路阻抗仿真计算幅频特性

Fig. 5 Magnitude-frequency characteristics of AC line impedance simulation calculation

图6 交流线路阻抗仿真计算相频特性

Fig. 6 Phase-frequency characteristics of AC line impedance simulation calculation

图7 换流器(电压前馈加低通滤波器)与交流线路阻抗幅值差频率特性

Fig. 7 Magnitude difference frequency characteristics between converter (supplementary low pass filter in voltage feedforward) and AC line impedance

图8 换流器(电压前馈加低通滤波器)与交流线路阻抗相位差频率特性

Fig. 8 Phase difference frequency characteristics between converter (supplementary low pass filter in voltage feedforward) and AC line impedance

图9 换流器(前馈电压加非线性滤波器)与交流线路阻抗幅值差频率特性

Fig. 9 Magnitude difference frequency characteristics between converter (forward voltage link non-liner filter) and AC line impedance

图10 换流器(前馈电压加非线性滤波器)与交流线路阻抗相位差频率特性

Fig. 10 Phase difference frequency characteristics between converter (forward voltage link non-liner filter) and AC line impedance

图11 两换流单元分列运行电网侧电压振荡波形

Fig. 11 Voltage resonance waveform under two converter unit separate operation mode

图12 两换流器分列运行与交流线路阻抗幅值差频率特性

Fig. 12 Magnitude difference frequency characteristics between converter and AC line impedance under two converters separate operation mode

图13 两换流器分列运行与交流线路阻抗相位差频率特性

Fig. 13 Phase difference frequency characteristics between converter and AC line impedance under two converters separate operation mode

图14 分列运行时单元2停运，功率转带至单元1波形

Fig. 14 Waveform of power transfer from converter unit 2 to unit 1 at separate operation mode

图 15 分列运行时单元2停运，张州II线跳闸，单元1恢复正常运行波形

Fig. 15 Waveform of unit 1 recovery normal operation while unit 2 stop and Zhangzhou II line trip at separate operation mode

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