孤岛微电网中基于电压-频率下垂与磁链-相角下垂两种控制策略的性能比较Performance Comparison of Two Control Strategies Based on Voltage-Frequency Droop and Linkage-Phase Angle Droop
张佳
ZHANG Jia
摘要(Abstract):
当微电网孤岛运行时,需要一定的控制策略建立系统内的电压和频率平衡。下垂控制因为不依赖于通信设备、运行可靠性高、"即插即用"等优点成为了微电网中广泛采用的控制策略。目前主要包括电压下垂控制和磁链下垂控制两种。首先,介绍了两种下垂控制的原理与下垂控制器设计。接下来,利用MATLAB/Simulink搭建了一个微源模型,分别利用以上两种策略对微源进行控制,并比较了两种策略下的输出电压、电流、频率特性。比较结果表明两种策略各有优劣。其中电压下垂控制比较复杂,频率偏差较大,但是电压、电流波形更好,谐波含量较小;磁链下垂控制比较简单,可以实现频率的微小偏差甚至零偏差,但是输出的电压、电流谐波含量较大。
Under the condition of islanding operation of microgrid, a control strategy is required to strike a balance between voltage and frequency in the system. Droop control, without dependency on communication equipment, and with its high operation reliability and Plug-and-Play, has now been widely used in microgrid.The droop control comprises voltage droop control and linkage droop control. Firstly, the principle of the droop control and design of droop controller is introduced; secondly, MATLAB/Simulink is used to build a microsource model, and the two strategies are employed to control the microsource and the output voltage, current and frequency characteristics are compared. The results show that voltage droop control is complex with large frequency deviation, better current waveform and small harmonic content while the linkage droop control is simple, with small or even zero frequency deviation and large output current and voltage harmonic content.
关键词(KeyWords):
微电网;孤岛运行;电压下垂;磁链下垂;频率偏差
microgrid;islanded operation;voltage droop;linkage droop;frequency deviation
基金项目(Foundation):
作者(Author):
张佳
ZHANG Jia
DOI: 10.19585/j.zjdl.202104004
参考文献(References):
- [1]Centre for Energy Economics Research and Policy.BP statistical review of world energy 2019[R/OL].(2019-07-30)[2020-09-30].https://www.bp.com/en/global/corporate/paper-copies.html.
- [2]张文亮,刘壮志,王明俊,等.智能电网的研究进展及发展趋势[J].电网技术,2009,33(13):1-11.
- [3]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.
- [4]杨新法,苏剑,吕志鹏,等.微电网技术综述[J].中国电机工程学报,2014,34(1):57-70.
- [5]陈萌,肖湘宁,赖柏竹.基于虚拟同步发电机控制的微电网分层频率控制[J].高电压技术,2018,44(4):1278-1284.
- [6]高扬,艾芊,王靖.多智能体系统的交直流混合微网群一致性协同控制[J].高电压技术,2018,44(7):2372-2377.
- [7]程军照,王文玺,陈江波.采用虚拟电抗的孤立微网负荷按比例分担控制方法[J].高电压技术,2016,42(7):2142-2148.
- [8]万千,夏成军,管霖,等.含高渗透率分布式电源的独立微网的稳定性研究综述[J].电网技术,2019,43(2):598-612.
- [9]刘观起,曹扬.分布式发电并联接入微网的控制技术研究综述[J].电网与清洁能源,2011,27(5):40-46.
- [10]HU J F,ZHU J G,DORRELL D G,et al.Virtual flux droop method—A new control strategy of inverters in microgrids[J].IEEE Transactions on Power Electronics.2014,29(9):4704-4711.
- [11]荆龙,黄杏,吴学智.改进型微源下垂控制策略研究[J].电工技术学报,2014,29(2):146-153.
- [12]陈丽娟,王致杰.基于改进下垂控制的微电网运行控制研究[J].电力系统保护与控制,2016,44(4):16-21.
- [13]舒杰,张先勇,沈玉梁.基于虚拟磁链的微电网分布式逆变电源的功率平衡控制[J].中山大学学报,2010,49(1):60-64.
- [14]李天慧,周杨,张健,等.基于电力弹簧的微电网分布式发电协同控制[J].广东电力,2020,33(1):33-42.
- [15]范博,杨秦敏,刘文新.微电网中并联分布式发电单元的分散式控制算法研究[J].浙江电力,2019,38(10):1-5.
- [16]郭潇潇,李岚,程之隆,等.风电孤岛模式下混合储能装置调频调压策略[J].电网与清洁能源,2019,35(10):96-102.
- [17]陈金锋,贾科,宣振文,等.基于离散一致性算法的直流微电网电压控制策略[J].浙江电力,2019,38(8):65-71.
- [18]张谦,蒋永梅,丁敏,等.基于光伏-蓄电池-超级电容的微电网协调控制策略[J].四川电力技术,2019,42(1):19-22.