基于动态下垂系数的低压微电网无功控制策略

doi:10.12204/j.issn.1000-7229.2022.01.009

电力建设 ›› 2022, Vol. 43 ›› Issue (1): 78-86.doi: 10.12204/j.issn.1000-7229.2022.01.009

基于动态下垂系数的低压微电网无功控制策略

罗朝旭¹^,², 刘洋¹, 罗钦¹(), 秦建衡¹

1.湖南工业大学电气与信息工程学院,湖南省株洲市 412007
2.电力电子装备与电力电子化电力网络湖南省重点实验室(中南大学),长沙市 410083

收稿日期:2021-03-31 出版日期:2022-01-01 发布日期:2021-12-21
通讯作者: 罗钦 E-mail:rochin@hut.edu.cn
作者简介:罗朝旭(1987),男,博士,讲师,硕士生导师,主要研究方向为电力电子变换器建模与控制、先进电能质量控制、微电网逆变器控制;
刘洋(1996),男,硕士研究生,主要研究方向为微电网运行与控制;
秦建衡(1998),男,硕士研究生,主要研究方向为微电网运行与控制。
基金资助:
电力电子装备与电力电子化电力网络湖南省重点实验室基金资助项目(2018TP1001)

Reactive Power Control Strategy of Low-Voltage Microgrid Applying Dynamic Droop Coefficient

LUO Zhaoxu¹^,², LIU Yang¹, LUO Qin¹(), QIN Jianheng¹

1. School of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007, Hunan Province,China
2. Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid (Central South University), Changsha 410083,China

Received:2021-03-31 Online:2022-01-01 Published:2021-12-21
Contact: LUO Qin E-mail:rochin@hut.edu.cn
Supported by:
Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid(2018TP1001)

摘要/Abstract

摘要：

在低压微电网中,由于受到线路阻抗参数呈阻性以及阻抗值不匹配的影响,常规下垂控制方法往往存在功率耦合和稳态无功功率分配不均的问题。针对上述问题提出一种自适应系数的改进下垂控制方法。该策略通过引入基准虚拟电抗将等效输出阻抗调节为感性,削弱线路阻性成分带来的耦合问题,从而能够应用感性下垂控制;其次,引入低带宽通信,根据功率均分需求自适应调节下垂系数,消除线路阻抗不匹配问题,从而实现无功功率精确均分。相比于传统下垂控制方法,该方法适用任意线路阻抗条件下的微电网控制,具有良好的动、稳态性能。最后,通过Matlab/Simulink仿真证明了该方法的正确性与有效性。

关键词: 微电网, 改进下垂控制, 虚拟电抗, 低带宽通信, 功率均分

Abstract:

In the low-voltage microgrid, due to the influence of the impedance of the line and the impedance mismatch, the conventional droop control often has the problems of power coupling and uneven distribution of steady-state reactive power. Aiming at the above problems, an improved droop control method with adaptive coefficients is proposed. This strategy adjusts the equivalent line impedance to inductive by introducing the reference virtual reactance, weakening the coupling problem caused by the line resistive component, so that inductive droop control can be applied; secondly, low-bandwidth communication is introduced, and the droop is adaptively adjusted according to the power sharing requirements. Coefficient is adjusted to eliminate the problem of line impedance mismatch, so as to achieve accurate and even distribution of reactive power. Compared with traditional droop control, this method is suitable for microgrid control under any line impedance condition, and has good dynamic and steady-state performance. The simulation results in Matlab/Simulink prove the correctness and effectiveness of the method.

Key words: microgrid, improved droop control, virtual reactance, low bandwidth communication, power sharing

中图分类号:

TM761

罗朝旭, 刘洋, 罗钦, 秦建衡. 基于动态下垂系数的低压微电网无功控制策略[J]. 电力建设, 2022, 43(1): 78-86.

LUO Zhaoxu, LIU Yang, LUO Qin, QIN Jianheng. Reactive Power Control Strategy of Low-Voltage Microgrid Applying Dynamic Droop Coefficient[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(1): 78-86.

图/表 14

图1 两台逆变器并联简化等效模型

Fig.1 Simplified equivalent model of two inverters in parallel

图2 2台容量相同的逆变器无功均分状况

Fig.2 Equal distribution of reactive power between two inverters with the same capacity

图3 引入虚拟电抗后等效电路图

Fig.3 Equivalent circuit diagram after introducing virtual reactance

图4 虚拟电抗引入过程原理图

Fig.4 Schematic diagram of the introduction process of the virtual reactance

图5 电压电流双闭环控制框图

Fig.5 Block diagram of voltage and current double closed-loop control

图6 虚拟电抗引入前后逆变器输出阻抗Bode图

Fig.6 Bode diagram of inverter output impedance before and after virtual reactance introduction

图7 动态下垂系数控制框图

Fig.7 Frame of dynamic droop coefficient control

图8 含有网络通信单元的微电网结构框图

Fig.8 Block diagram of microgrid structure with network communication unit

图9 动态系数调节无功功率过程

Fig.9 Process of dynamic coefficient adjusting reactive power

表1 仿真参数

Table 1 Simulation parameters

图10 工况1下的功率输出情况

Fig.10 Power output under working condition 1

图11 工况2下的功率输出情况

Fig.11 Power output under working condition 2

图12 工况3下的功率输出情况

Fig.12 Power output under working condition 3

图13 工况4下的功率输出情况

Fig.13 Power output under working condition 4

参考文献 24

[1]	刘畅, 卓建坤, 赵东明, 等. 利用储能系统实现可再生能源微电网灵活安全运行的研究综述[J]. 中国电机工程学报, 2020, 40(1): 1-18.
	LIU Chang, ZHUO Jiankun, ZHAO Dongming, et al. A review on the utilization of energy storage system for the flexible and safe operation of renewable energy microgrids[J]. Proceedings of the CSEE, 2020, 40(1): 1-18.
[2]	周孝信, 鲁宗相, 刘应梅, 等. 中国未来电网的发展模式和关键技术[J]. 中国电机工程学报, 2014, 34(29): 4999-5008.
	ZHOU Xiaoxin, LU Zongxiang, LIU Yingmei, et al. Development models and key technologies of future grid in China[J]. Proceedings of the CSEE, 2014, 34(29): 4999-5008.
[3]	DENG W Y, DAI N Y, LAO K W, et al. A virtual-impedance droop control for accurate active power control and reactive power sharing using capacitive-coupling inverters[J]. IEEE Transactions on Industry Applications, 2020, 56(6): 6722-6733. doi: 10.1109/TIA.2020.3012934 URL
[4]	朱珊珊, 汪飞, 郭慧, 等. 直流微电网下垂控制技术研究综述[J]. 中国电机工程学报, 2018, 38(1): 72-84.
	ZHU Shanshan, WANG Fei, GUO Hui, et al. Overview of droop control in DC microgrid[J]. Proceedings of the CSEE, 2018, 38(1): 72-84.
[5]	李维波, 徐聪, 许智豪, 等. 基于自适应虚拟阻抗的舰用逆变器并联策略[J]. 高电压技术, 2019, 45(8): 2538-2544.
	LI Weibo, XU Cong, XU Zhihao, et al. Inverter parallel control strategy based on variable virtual impedance[J]. High Voltage Engineering, 2019, 45(8): 2538-2544.
[6]	朱一昕, 卓放, 王丰, 等. 用于微电网无功均衡控制的虚拟阻抗优化方法[J]. 中国电机工程学报, 2016, 36(17): 4552-4564.
	ZHU Yixin, ZHUO Fang, WANG Feng, et al. Virtual impedance optimization method for microgrid reactive power sharing control[J]. Proceedings of the CSEE, 2016, 36(17): 4552-4564.
[7]	冯夏云, 汪飞, 李玉菲, 等. 下垂控制逆变器输出阻抗外特性建模及参数敏感性分析[J]. 中国电机工程学报, 2020, 40(21): 7012-7022.
	FENG Xiayun, WANG Fei, LI Yufei, et al. Modelling and sensitivity analysis for the output impedance profile of droop controlled inverter[J]. Proceedings of the CSEE, 2020, 40(21): 7012-7022.
[8]	赵巍, 赵路, 孙孝峰, 等. 下垂控制逆变器阻抗模型研究[J]. 太阳能学报, 2019, 40(8): 2335-2345.
	ZHAO Wei, ZHAO Lu, SUN Xiaofeng, et al. Research on output impedance model of droop controlled inverter[J]. Acta Energiae Solaris Sinica, 2019, 40(8): 2335-2345.
[9]	张鑫洲, 王维庆, 王海云. 一种恢复电压和频率的微网改进下垂控制方法[J]. 电力建设, 2016, 37(10): 48-53.
	ZHANG Xinzhou, WANG Weiqing, WANG Haiyun. An improved droop control method for voltage and frequency restoration in microgrid[J]. Electric Power Construction, 2016, 37(10): 48-53.
[10]	MAJUMDER R, LEDWICH G, GHOSH A, et al. Droop control of converter-interfaced microsources in rural distributed generation[J]. IEEE Transactions on Power Delivery, 2010, 25(4): 2768-2778. doi: 10.1109/TPWRD.2010.2042974 URL
[11]	JOHN B, GHOSH A, ZARE F. Load sharing in medium voltage islanded microgrids with advanced angle droop control[J]. IEEE Transactions on Smart Grid, 2018, 9(6): 6461-6469. doi: 10.1109/TSG.2017.2713452 URL
[12]	徐远洋, 王明渝. 低压微电网中新型控制策略研究[J]. 太阳能学报, 2020, 41(9): 70-77.
	XU Yuanyang, WANG Mingyu. Research on new control strategy in low-voltage microgrid[J]. Acta Energiae Solaris Sinica, 2020, 41(9): 70-77.
[13]	吕艳玲, 杜怡志. 低电压逆变器并联改进下垂控制技术[J]. 电机与控制学报, 2020, 24(10): 38-47.
	LÜ Yanling, DU Yizhi. Improved droop control technology of low voltage inverter parallel[J]. Electric Machines and Control, 2020, 24(10): 38-47.
[14]	SUN Y, SHI G Z, LI X, et al. An f-P/Q droop control in cascaded-type microgrid[J]. IEEE Transactions on Power Systems, 2018, 33(1): 1136-1138.
[15]	郑若楠, 韩华, 李国杰,等. 逆变器串并联型微电网的一种本地主从协调控制策略[J]. 电力系统保护与控制, 2020, 48(23):47-56.
	ZHENG Ruonan, HAN Hua, LI Guojie, et al. A local master-slave coordinated control strategy for inverter series-parallel microgrid[J]. Power System Protection and Control, 2020, 48(23):47-56.
[16]	王子豪, 牟龙华, 方重凯. 基于下垂控制的低压微电网故障控制策略[J]. 电力系统保护与控制, 2020, 48(22):84-90.
	WANG Zihao, MOU Longhua, FANG Zhongkai. Low-voltage microgrid fault control strategy based on droop control[J]. Power System Protection and Control, 2020, 48(22):84-90.
[17]	郭倩, 林燎源, 武宏彦, 等. 考虑自适应虚拟阻抗的微电网分布式功率控制策略[J]. 电力系统自动化, 2016, 40(19): 23-29.
	GUO Qian, LIN Liaoyuan, WU Hongyan, et al. Distributed power control strategy for microgrids considering adaptive virtual impedance[J]. Automation of Electric Power Systems, 2016, 40(19): 23-29.
[18]	白小丹, 苗虹, 曾成碧, 等. 适用于低压微网中逆变器无功均分的改进下垂控制策略[J]. 高电压技术, 2020, 46(4): 1310-1318.
	BAI Xiaodan, MIAO Hong, ZENG Chengbi, et al. Improved droop control strategy for reactive power sharing of inverters in low-voltage microgrids[J]. High Voltage Engineering, 2020, 46(4): 1310-1318.
[19]	吕志鹏, 吴鸣, 黄红, 等. 一种具有网络自适应能力的分布式电源改进下垂控制策略[J]. 电网技术, 2018, 42(9): 2948-2957.
	LÜ Zhipeng, WU Ming, HUANG Hong, et al. An improved droop control with network self-adaptability for distributed generation[J]. Power System Technology, 2018, 42(9): 2948-2957.
[20]	PENG Z S, WANG J, BI D Q, et al. Droop control strategy incorporating coupling compensation and virtual impedance for microgrid application[J]. IEEE Transactions on Energy Conversion, 2019, 34(1): 277-291.
[21]	柏管, 陈卓, 刘飞. 基于自调节下垂控制的分布式电源并联运行技术[J]. 电力系统保护与控制, 2019, 47(8): 120-126.
	BAI Guan, CHEN Zhuo, LIU Fei. Parallel operation technology of distributed generation based on self-regulation droop control[J]. Power System Protection and Control, 2019, 47(8): 120-126.
[22]	张也, 颜湘武. 微网功率耦合特性分析及解耦控制[J]. 电网技术, 2016, 40(3): 812-818.
	ZHANG Ye, YAN Xiangwu. Coupling analysis and decoupling control of microgrid power[J]. Power System Technology, 2016, 40(3): 812-818.
[23]	张庆海, 罗安, 陈燕东, 等. 并联逆变器输出阻抗分析及电压控制策略[J]. 电工技术学报, 2014, 29(6): 98-105.
	ZHANG Qinghai, LUO An, CHEN Yandong, et al. Analysis of output impedance for parallel inverters and voltage control strategy[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 98-105.
[24]	梁海峰, 董玥, 郑灿. 基于下垂控制的逆变器参数对微电网稳定性的影响研究[J]. 电力建设, 2018, 39(8): 119-127.
	LIANG Haifeng, DONG Yue, ZHENG Can. Influence of inverter parameters based on droop control on microgrid stability[J]. Electric Power Construction, 2018, 39(8): 119-127.

基于动态下垂系数的低压微电网无功控制策略

Reactive Power Control Strategy of Low-Voltage Microgrid Applying Dynamic Droop Coefficient

RichHTML

PDF

可视化

摘要/Abstract

引用本文

使用本文

图/表 14

参考文献 24

相关文章 15

编辑推荐

Metrics

本文评价

[1]	徐艳春, 张进, 汪平, MI Lu. 考虑配电网静态电压稳定性的微电网优化配置[J]. 电力建设, 2022, 43(8): 87-101.
[2]	马海宁, 王鲁杨, 仇成, 乔露, 吉铭成. 直流微电网不同荷电状态多储能系统分布式控制[J]. 电力建设, 2022, 43(7): 87-95.
[3]	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.
[4]	朱廷虎, 刘洋, 许立雄, 饶萍, 李振伟, 吴涵. 基于区块链技术的微电网群分布式电能交易模式[J]. 电力建设, 2022, 43(6): 12-23.
[5]	徐加银, 汪涛, 王加庆, 刘琛, 马英浩. 考虑微电网灵活性资源属性的配电网规划方法[J]. 电力建设, 2022, 43(6): 84-92.
[6]	陈恩玲, 王向文, 贾明潇, 孙充. 云储能用户在计划停电下的应急能源管理策略[J]. 电力建设, 2022, 43(5): 72-78.
[7]	范培潇, 杨军, 肖金星, 徐冰雁, 叶影, 李勇汇, 李蕊. 基于深度Q学习的含电动汽车孤岛微电网负荷频率控制策略[J]. 电力建设, 2022, 43(4): 91-99.
[8]	刘志坚, 李晓磊, 梁宁, 郑峰, 伍仰金, 张婷婷. 基于前馈自抗扰的光伏微电网混合储能控制策略[J]. 电力建设, 2021, 42(9): 96-104.
[9]	赵佳, 孟润泉, 魏斌, 王磊, 韩肖清. 计及电动汽车用户需求的直流微电网经济调度策略[J]. 电力建设, 2021, 42(7): 39-47.
[10]	牛耕, 季宇, 陈培坤, 寇凌峰, 孙树敏, 滕玮, 张利伟, 陈继开. 含海洋能发电的海岛微网能量优化调度方法[J]. 电力建设, 2021, 42(6): 96-104.
[11]	王子鹏, 郑丽君, 吕世轩. 考虑多储能系统功率分配的独立直流微电网协调控制策略[J]. 电力建设, 2021, 42(4): 89-96.
[12]	孔健生, 任春光, 秦月, 张佰富, 杨玉岗, 韩肖清. 不平衡工况下CLLC型交直流母线接口变换器控制策略[J]. 电力建设, 2021, 42(11): 23-33.
[13]	王植, 马振, 胡鹏涛, 朱永强. 孤岛交直流混合微电网功率互助策略[J]. 电力建设, 2021, 42(1): 76-84.
[14]	姚建华, 胡晟, 王冠, 沈云, 姜林林, 冯宇立, 龚成亚, 张照轩, 柳伟. 基于强化学习的孤岛微电网多源协调频率控制方法[J]. 电力建设, 2020, 41(9): 69-75.
[15]	李浩茹, 丁保迪, 季宇, 王永刚, 陈继开, 张利伟. 考虑光伏出力间歇性的微电网故障辨识方法[J]. 电力建设, 2020, 41(9): 76-85.