基于多滑模变结构的双向并网变换器虚拟惯性控制策略

doi:10.12204/j.issn.1000-7229.2022.07.014

电力建设 ›› 2022, Vol. 43 ›› Issue (7): 121-130.doi: 10.12204/j.issn.1000-7229.2022.07.014

基于多滑模变结构的双向并网变换器虚拟惯性控制策略

刘彦呈(), 吕旭(), 张勤进(), 胡王宝(), 张瀚文()

大连海事大学轮机工程学院,辽宁省大连市 116026

收稿日期:2021-11-26 出版日期:2022-07-01 发布日期:2022-06-30
通讯作者: 吕旭 E-mail:lcy3@163.com;lvxu0717@163.com;zqj18@qq.com;251362936@qq.com;zhanghanwen0132@163.com
作者简介:刘彦呈( 1963),男,博士,教授,博士生导师,研究方向为船舶电力推进技术及船舶智能微电网技术,E-mail: lcy3@163.com;
张勤进( 1986),男,博士,副教授,从事直流微电网运行与控制研究,E-mail: zqj18@qq.com;
胡王宝( 1997),男,硕士研究生,从事直流微电网多光伏单元协调控制研究,E-mail: 251362936@qq.com;
张瀚文( 1997),男,硕士研究生,从事直流微电网稳定控制研究,E-mail: zhanghanwen0132@163.com。
基金资助:
国家自然科学基金资助项目(51709028);国家自然科学基金资助项目(51979021)

Virtual Inertia Control Strategy of Bidirectional Grid-Connected Converter Applying Multiple Sliding Mode Variable Structure Control

LIU Yancheng(), LÜ Xu(), ZHANG Qinjin(), HU Wangbao(), ZHANG Hanwen()

Marine Engineering College, Dalian Maritime University, Dalian 116026, Liaoning Province, China

Received:2021-11-26 Online:2022-07-01 Published:2022-06-30
Contact: LÜ Xu E-mail:lcy3@163.com;lvxu0717@163.com;zqj18@qq.com;251362936@qq.com;zhanghanwen0132@163.com
Supported by:
National Natural Science Foundation of China(51709028);National Natural Science Foundation of China(51979021)

摘要/Abstract

摘要：

针对直流微电网惯性低、母线电压抗干扰能力差的问题,以双向并网变换器为控制对象,提出一种基于多滑模变结构的虚拟惯性控制策略。内环采用基于指数趋近律的滑模电流控制,快速跟踪并网电流给定值,提高系统的响应速度。外环建立虚拟惯性控制方程与电压滑模面结构,增强直流微电网的惯性,平抑直流母线电压波动。通过小信号扰动法和Nyquist判据证明了双向并网变换器在所提控制策略下的稳定性。最后,搭建了相应的仿真模型和StarSim HIL硬件在环实验平台。仿真及实验结果表明,与基于PI控制和无源控制的虚拟惯性控制策略相比,文章所提控制策略具有更好的动态、静态特性,提高了直流母线电压的稳定性。

关键词: 直流微电网, 双向并网变换器, 多滑模变结构控制, 虚拟惯性控制

Abstract:

Aiming at the problems of low inertia and poor anti-interference ability of bus voltage in DC microgrid, a virtual inertia control strategy based on multiple sliding mode variable structure control is proposed in this paper. Sliding mode current control based on the index reaching law is adopted in the inner loop, which can quickly track the given value of grid-connected current and improve the response speed of the system. Virtual inertia control equation and voltage sliding mode surface structure are established in the outer loop to enhance the inertia of the DC microgrid and suppress the fluctuation of the DC bus voltage. The stability of bidirectional grid-connected converter under the proposed control strategy is proved by small-signal disturbance method and Nyquist criterion. Finally, the corresponding simulation model and StarSim HIL hardware-in-the-loop experimental platform are built. The results show that, compared with the traditional virtual inertia control strategy based on PI control and passivity-based control, the proposed control strategy has better dynamic and static characteristics, and improves the stability of the DC bus voltage.

Key words: DC microgrid, bidirectional grid-connected converter, multiple sliding mode variable structure control, virtual inertia control

中图分类号:

TM46

刘彦呈, 吕旭, 张勤进, 胡王宝, 张瀚文. 基于多滑模变结构的双向并网变换器虚拟惯性控制策略[J]. 电力建设, 2022, 43(7): 121-130.

LIU Yancheng, LÜ Xu, ZHANG Qinjin, HU Wangbao, ZHANG Hanwen. Virtual Inertia Control Strategy of Bidirectional Grid-Connected Converter Applying Multiple Sliding Mode Variable Structure Control[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(7): 121-130.

图/表 14

图1 含BGC的直流微电网结构图

Fig.1 Diagram of DC micro-grid with BGC

图2 含BGC的直流微电网等效结构图

Fig.2 Equivalent diagram of DC micro-grid with BGC

图3 BGC系统控制框图

Fig.3 Block diagram of BGC system control

图4 d轴电流环小信号模型

Fig.4 Small-signal model of d-axis current

图5 BGC系统的小信号模型

Fig.5 Small-signal model of BGC system

图6 BGC系统的Nyquist曲线图

Fig.6 Nyquist curve of BGC system

表1 BGC系统仿真参数

Table 1 Simulation parameters of BGC system

图7 三种控制策略下直流母线电压对比

Fig.7 Comparison of DC bus voltage under three control strategies

图8 三种控制策略下网侧电流波形及THD分析

Fig.8 Waveforms of grid-connected current and THD analysis under three control strategies

表2 三种控制策略下直流母线电压动态性能指标

Table 2 Transient performance index of DC bus voltage under three control strategies

图9 不同Cv下的直流母线电压动态响应

Fig.9 Dynamic response of DC bus voltage under different Cv

图10 基于StarSim HIL的BGC系统实验平台

Fig.10 Experimental platform of BGC system based on StarSim HIL

图11 负载功率突变时直流母线电压的实验波形

Fig.11 Experimental waveforms of DC bus voltage when load power suddenly changes

图12 不同策略下网侧电压、电流的实验波形

Fig.12 Experimental waveforms of voltage and current at network side under different control strategies

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基于多滑模变结构的双向并网变换器虚拟惯性控制策略

Virtual Inertia Control Strategy of Bidirectional Grid-Connected Converter Applying Multiple Sliding Mode Variable Structure Control

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