计及限流—储能协调控制的高渗透率微电网故障穿越能力探讨
Study on the Fault Ride-through Capability of High Penetration Micro-grid Considering Coordinated Control of Fault Current Limiter and Energy Storage
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摘要:
高渗透微电网在短路故障时的应对机制及暂态性能将对配电网的运行产生重要影响，确保故障下微电网与配电网的安全可靠运行具有极强的理论和现实意义。解析了不同故障位置下微电网的应对处理机制，并提出了一种结合故障限流器与储能装置的协调控制理念，以期使高渗透微电网在无需孤岛运行时实现故障穿越，在应转为孤岛运行时实现平稳过渡。在此基础上，针对国内外的相关研究现状开展了概述及分析，并以某微电网系统范例为具体对象，验证了限流-储能协调控制在强化微电网暂态性能的有效性和可行性。 Abstract:In the case of that a micro-grid with high penetration of renewable resources is accessed into a power distribution network, the micro-grid's treatment mode and transient performance under the short-circuit fault condition will affect the power distribution network's operation characteristics dramatically. This paper analyzes the micro-grid's treatment modes corresponding to different fault locations, and proposes a technical idea considering the coordinated control of the fault current limiter and energy storage allocated inside the micro-grid. It is expected to actively strengthen the micro-grid's fault ride-through(FRT) capability as far as possible. And for some specific faults, the micro-grid should disconnect from the main network, and the coordinated control strategy can make the micro-grid implement a smooth transition between its grid-connected and islanded modes. Besides, directing at the some key issues related to the micro-grid's fault ride-through capability, the survey of research situation at home and abroad is carried out. At last, a typical micro-grid system is selected, and the simulation analysis is done to verify the effectiveness of the coordinated control.
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