| 引用本文: | 刘海涛,吕志鹏,苏剑,等.具有功率精确分配能力的逆变器电压谐波
分频下垂控制方法研究[J].电力系统保护与控制,2015,43(19):9-14.[点击复制] |
| LIU Haitao,Lü Zhipeng,SU Jian,et al.Inverter’s frequency dividing droop controller with accurate load sharing ability[J].Power System Protection and Control,2015,43(19):9-14[点击复制] |
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| 摘要: |
| 微网中有可能存在电压谐波问题。设计具有能量转换和电压谐波治理的复合型逆变器有助于降低微网的成本。同时当多逆变器并联时，希望各逆变器能在基波和谐波域依照各自容量分配功率。现有方法是采用下垂控制和虚拟阻抗技术。首先建立包含谐波域的逆变器并网模型，阐述了谐波抑制的基本原理。然后讨论了设计逆变器的输出阻抗为阻性的方法。随后应用下垂控制策略，提出了逆变器基波和谐波的分频下垂控制器设计方法。最后通过PSCAD验证了该方法不仅能有效地抑制电压谐波，而且也能依照容量合理分配基波域和谐波域的功率。 |
| 关键词: 微网 逆变器 下垂控制 功率分配 谐波抑制 |
| DOI：10.7667/j.issn.1674-3415.2015.19.002 |
| 投稿时间：2014-12-12修订日期：2015-04-11 |
| 基金项目:国家电网公司“千人计划”专项支持项目(PD71-12-017)；国家电网公司科技项目“高密度分布式逆变系统自适应控制关键技术研究” |
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| Inverter’s frequency dividing droop controller with accurate load sharing ability |
| LIU Haitao,LÜ Zhipeng,SU Jian,WU Ming,ZHANG Changhua,CHEN Xin,LIAN Jingru |
| (China Electric Power Research Institute, Beijing 100192, China;School of Energy Science and Engineering,
University of Electronic Science and Technology of China, Chengdu 611731, China) |
| Abstract: |
| Because there possibly lies voltage harmonics pollution in microgrids, it benefits to reduce system cost if inverters have compound functions of voltage harmonics suppression and electrical energy conversion. Moreover, when multi inverters operated parallel in the mircogrids, they are expected to share the power proportionally according to their capacities. In this respect, frequency dividing droop control strategy and inverter’s virtual output impedance shaping technology are quite attractive methods to achieve this goal. In this paper, firstly inverter grid-connected model containing the harmonics components is built and voltage harmonics suppression principle is introduced. Then, the method of making inverters’ output impedance resistive is discussed. Subsequently, with droop control theory, design of frequency dividing droop controller within fundamental and harmonic frequencies fields is presented out. At the last part of this paper, with PSCAD simulation tool, validity of proposed method is proved and satisfied performances are obtained in the respects of not only harmonics suppression but also proportional load sharing according to its capacity. |
| Key words: micro-grid inverters droop control load sharing harmonics suppression |
