| 引用本文: | 王二永,王帅.基于自适应虚拟电阻的低压微电网下垂控制策略[J].电力系统保护与控制,2020,48(2):144-149.[点击复制] |
| WANG Eryong,WANG Shuai.Low voltage microgrid droop control strategy based on adaptive virtual resistance[J].Power System Protection and Control,2020,48(2):144-149[点击复制] |
|
| 摘要: |
| 在多逆变器并联运行的低压微电网系统中，由于各逆变器输出线路阻抗差异的存在，导致系统中各分布式发电单元根据传统反下垂控制策略对公共负荷的有功功率难以进行合理分配，影响系统的稳定性。针对这一问题，对低压微电网系统的输出功率分配性能进行了理论分析，得出影响功率分配性能的主要因素。将自适应虚拟电阻引入电压电流双闭环控制中，不仅抑制有功功率和无功功率间的耦合作用对系统稳定性产生的影响，而且也提高了系统的输出电能质量。其自适应虚拟电阻的阻值能实时跟踪各分布式电源实际输出有功功率与参考输出有功功率差值的变化而自适应调整，及时有效地补偿了因线路阻抗差异产生的母线电压降。采取所提策略使各分布式电源能够对公共负荷中的有功功率进行合理分配。最后，在仿真平台上验证了该策略的有效性和正确性。 |
| 关键词: 低压微电网 传统反下垂控制 线路阻抗 功率均分 虚拟电阻 自适应 |
| DOI：10.19783/j.cnki.pspc.190282 |
| 投稿时间：2019-03-28修订日期：2019-11-17 |
| 基金项目:河南省高等学校重点科研项目资助(17A510002);河南理工大学博士基金项目资助(B2016-18) |
|
| Low voltage microgrid droop control strategy based on adaptive virtual resistance |
| WANG Eryong,WANG Shuai |
| (School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454150, China) |
| Abstract: |
| In the low voltage microgrid system with multiple inverters running in parallel, due to the difference of output line impedance of each inverter, it is difficult for each distributed power generation unit in the system to allocate the active power of the common load according to the traditional reverse droop control strategy, which affects the stability of the system. In order to solve this problem, this paper theoretically analyzes the output power allocation performance of low voltage micro-low network system, and obtains the main factors that affect the power allocation performance. Introducing adaptive virtual resistance into voltage and current double closed loop control not only suppresses the influence of the coupling between active power and reactive power on the stability of the system, but also improves the output power quality of the system. The resistance value of the adaptive virtual resistance can track the change of the difference between the output active power and reference output active power of each distributed power generation unit in real time and adjust adaptively, which compensate the bus voltage drop caused by the line impedance difference in time and effectively. The proposed strategy can make each distributed power supply distribute the active power in the common load reasonably. Finally, the effectiveness and correctness of the strategy are verified on the simulation platform. This work is supported by Key Scientific Research Project of Colleges and Universities in Henan Province (No. 17A510002) and PhD Foundation of Henan Polytechnic University (No. B2016-18). |
| Key words: micro-grid traditional reverse droop control line impedance power sharing virtual resistance self-adaption |
