基于分频段前馈补偿的并网变流器输出阻抗校正*

doi:10.11985/2021.04.017

电气工程学报 ›› 2021, Vol. 16 ›› Issue (4): 135-142.doi: 10.11985/2021.04.017

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基于分频段前馈补偿的并网变流器输出阻抗校正^*

曹建伟¹(), 张磊¹, 钱强²(), 张犁²(), 丁勇³

1.国网湖州供电公司湖州 313000
2.河海大学能源与电气学院南京 211106
3.南京南瑞继保工程技术有限公司南京 211102

收稿日期:2021-06-07 修回日期:2021-07-17 出版日期:2021-12-25 发布日期:2022-02-10
通讯作者: 钱强 E-mail:cjianwei1978@126.com;qianqiang@hhu.edu.cn;zhanglinuaa@hhu.edu.cn
作者简介:* 钱强,男,1992年生,博士,讲师。主要研究方向为并网变流器控制。E-mail： qianqiang@hhu.edu.cn
曹建伟,男,1978年生,工程师。主要研究方向为新能源并网运行与控制。E-mail： cjianwei1978@126.com
张犁,男,1985年生,博士,教授。主要研究方向为新能源电力变换装备及运行控制。E-mail： zhanglinuaa@hhu.edu.cn
基金资助:
* 国网浙江省电力公司科技(2019-HUZJTKJ-14);江苏省自然科学基金青年基金(BK20200510);中央高校基本科研业务费专项资金(B200201022)

Frequency-dependent Feedforward Compensation for Reshaping the Output Impedance of Grid-connected Converter

CAO Jianwei¹(), ZHANG Lei¹, QIAN Qiang²(), ZHANG Li²(), DING Yong³

1. State Grid Huzhou Power Supply Company, Huzhou 313000
2. College of Energy and Electrical Engineering, Hohai University, Nanjing 211106
3. NARI Electric Co., Ltd., Nanjing 211102

Received:2021-06-07 Revised:2021-07-17 Online:2021-12-25 Published:2022-02-10
Contact: QIAN Qiang E-mail:cjianwei1978@126.com;qianqiang@hhu.edu.cn;zhanglinuaa@hhu.edu.cn

摘要/Abstract

摘要：

并网变流器是分布式发电系统中交直流接口关键设备,为解决弱电网下电网阻抗同并网变流器的交互作用所引起的宽频率范围谐波谐振及系统失稳问题,基于级联系统阻抗模型研究了传统的电网电压单位比例前馈对并网变流器输出阻抗幅相特性的影响,提出基于数字滤波器的电网电压分频段前馈补偿策略,包括减小电网电压前馈低频分量的增益和延迟,增加电网电压前馈高频分量的延迟,并给出前馈补偿回路参数的设计方法,重塑并网变流器输出阻抗为无源特性,提升了并网变流器对电网阻抗宽范围变化的适应能力,实现弱电网下并网系统宽频范围谐波谐振的抑制。仿真和试验验证了理论分析的正确性和所提电网电压分频段前馈补偿策略的有效性。

关键词: 并网变流器, 谐波谐振, 弱电网, 电网电压前馈

Abstract:

Grid-connected converter is acting as the critical AC/DC interface in distributed power generation system. Aiming at solving the harmonic resonance over the wide-frequency band and the system instability problem caused by interactions between the grid impedance and the grid-connected converter, the influence of the traditional unit grid voltage feedforward (GVF) compensation on the magnitude-phase characteristic through the cascaded impedance model is revealed. The frequency-dependent feedforward compensation strategy based on the digital filter is further proposed, which includes the reduction of the gain and the delay of the low-frequency component of the grid voltage, and the increase of the delay of the high-frequency component of the grid voltage. The design guideline of the feedforward parameters is further elaborated, which reshapes the inverter output impedance to be passive. The adaptability to the variation of the grid impedance is enhanced, and the wide-frequency band harmonics under the weak grid are also suppressed. Simulation and experimental results finally verify the correctness of the theoretical analysis and the effectiveness of the proposed frequency-dependent GVF compensation strategy.

Key words: Grid-connected converter, harmonic resonance, weak grid, grid voltage feedforward

中图分类号:

TM46

曹建伟, 张磊, 钱强, 张犁, 丁勇. 基于分频段前馈补偿的并网变流器输出阻抗校正^*[J]. 电气工程学报, 2021, 16(4): 135-142.

CAO Jianwei, ZHANG Lei, QIAN Qiang, ZHANG Li, DING Yong. Frequency-dependent Feedforward Compensation for Reshaping the Output Impedance of Grid-connected Converter[J]. Journal of Electrical Engineering, 2021, 16(4): 135-142.

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参数	数值	参数	数值
逆变器侧电感L_i1/mH	0.8	控制频率f_s/kHz	15
滤波电容C_f/μF	7	开关频率f_s/kHz	15
网侧电感L_i2/mH	0.5	LCL谐振频率f_r/kHz	3.43
比例增益k_p	9.75	积分因子k_i	16 250

基于分频段前馈补偿的并网变流器输出阻抗校正^*

Frequency-dependent Feedforward Compensation for Reshaping the Output Impedance of Grid-connected Converter

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