非理想电网条件下基于多目标约束的中压直挂型储能变流器并网电流改善研究*

doi:10.11985/2022.01.018

电气工程学报 ›› 2022, Vol. 17 ›› Issue (1): 137-147.doi: 10.11985/2022.01.018

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非理想电网条件下基于多目标约束的中压直挂型储能变流器并网电流改善研究^*

李高宁¹(), 吕建国¹(), 叶善堃²(), 姚凯¹^,², 孙状¹

1.南京理工大学自动化学院南京 210094
2.南瑞集团有限公司智能电网保护和运行控制国家重点实验室南京 211106

收稿日期:2021-07-13 修回日期:2021-11-20 出版日期:2022-03-25 发布日期:2022-05-06
通讯作者: 叶善堃 E-mail:li15256971761@163.com;jianguolyu@njust.edu.cn;yeshankun@sgepri.sgcc.com.cn
作者简介:李高宁,男,1998年生,硕士研究生。主要研究方向为分布式发电与微电网技术。E-mail： li15256971761@163.com;
吕建国,男,1987年生,博士,副教授。主要研究方向为分布式发电与微电网技术、电力电子变换器控制技术。E-mail： jianguolyu@njust.edu.cn
基金资助:
*智能电网保护和运行控制国家重点实验室资助项目(SGNR0000KJJS2007620)

Research on Control Method of Medium Voltage Direct-mounted Energy Storage Converter under Non-ideal Grid Conditions

LI Gaoning¹(), LÜ Jianguo¹(), YE Shankun²(), YAO Kai¹^,², SUN Zhuang¹

1. School of Automation, Nanjing University of Science and Technology, Nanjing 210094
2. State Key Laboratory of Smart Grid Protection and Control, NARI Group, Nanjing 211106

Received:2021-07-13 Revised:2021-11-20 Online:2022-03-25 Published:2022-05-06
Contact: YE Shankun E-mail:li15256971761@163.com;jianguolyu@njust.edu.cn;yeshankun@sgepri.sgcc.com.cn

摘要/Abstract

摘要：

针对非理想电网电压条件下造成的级联H桥光伏逆变器并网电流畸变、低次谐波含量高等问题,主要对中压直挂型级联H桥储能变流器在非理想电网条件下的控制策略进行研究。首先分析介绍了三相级联H桥储能变流器的拓扑结构以及数学模型,其次建立了电网电压处于不平衡以及谐波污染时基于准比例积分谐振(Proportional integral-harmonic resonance,PI-HR)调节器的同步旋转坐标系下双电流闭环控制系统,给出了具体的控制结构框图,并从系统的稳定性考虑,以系统的相位裕度、幅值裕度、基频增益作为稳定性约束条件,联合建立了对控制器参数的约束方程,构建了比较系统完整的控制器参数设计方法。最后搭建了一套三相级联H桥多电平储能变流器系统的Matlab/Simulink仿真模型,通过仿真分析验证了所设计控制策略的正确性和有效性。

关键词: 级联H桥, 储能变流器, 非理想电网, 低次谐波, PI-HR调节器

Abstract:

Aiming at the problems of grid-connected H-bridge photovoltaic inverter grid-connected current distortion and high low-order harmonic content caused by non-ideal grid voltage conditions, the control strategy of energy storage converter of cascaded H-bridge under the condition of non-ideal grid is studied. First, the topology and mathematical model of the three-phase cascaded H-bridge energy storage converter are analyzed and introduced. Secondly, on the basis of quasi-proportional integral-harmonic resonance(PI-HR) regulator, when the grid voltage is unbalanced and harmonic- pollution, the dual current closed-loop control system under the synchronous rotating coordinate system is established, a specific control structure block diagram is given, and considering the stability of the system, the phase margin, amplitude margin, and fundamental frequency gain of the system are taken as the stability constraint conditions, the constraint equations for the controller parameters are established. Finally, a Matlab/Simulink simulation model of three-phase cascaded H-bridge multilevel energy storage converter system is built. Simulation analysis verifies the correctness and effectiveness of the control strategy designed in this paper.

Key words: Cascaded H-bridge, energy storage converter, non-ideal power grid, low-order harmonics, PI-HR regulator

中图分类号:

TM464

李高宁, 吕建国, 叶善堃, 姚凯, 孙状. 非理想电网条件下基于多目标约束的中压直挂型储能变流器并网电流改善研究^*[J]. 电气工程学报, 2022, 17(1): 137-147.

LI Gaoning, LÜ Jianguo, YE Shankun, YAO Kai, SUN Zhuang. Research on Control Method of Medium Voltage Direct-mounted Energy Storage Converter under Non-ideal Grid Conditions[J]. Journal of Electrical Engineering, 2022, 17(1): 137-147.

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S_1,1	S_1,2	${{\bar{S}}_{1,1}}$	${{\bar{S}}_{1,2}}$	输出电压
1	0	0	1	V_dc
0	1	0	1	0
1	0	1	0	0
0	1	1	0	-V_dc

参数	数值
系统总功率/MW	2
电网相电压幅值/V	8 165
H桥直流侧电压/V	960
每相H桥单元个数	12
滤波电感L/mH	12
采样频率/kHz	20
电网-5次谐波相电压幅值/V	816.5
电网+7次谐波相电压幅值/V	408.25

非理想电网条件下基于多目标约束的中压直挂型储能变流器并网电流改善研究^*

Research on Control Method of Medium Voltage Direct-mounted Energy Storage Converter under Non-ideal Grid Conditions

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