李清然, 张建成. 含储能分布式光伏系统并网点电压调整方案设计[J]. 现代电力, 2016, 33(2): 33-38.
引用本文: 李清然, 张建成. 含储能分布式光伏系统并网点电压调整方案设计[J]. 现代电力, 2016, 33(2): 33-38.
LI Qingran, ZHANG Jiancheng. Design of Regulation Strategy for Voltage Level at Common Coupling Node in Distributed PV System with Energy Storages Devices[J]. Modern Electric Power, 2016, 33(2): 33-38.
Citation: LI Qingran, ZHANG Jiancheng. Design of Regulation Strategy for Voltage Level at Common Coupling Node in Distributed PV System with Energy Storages Devices[J]. Modern Electric Power, 2016, 33(2): 33-38.

含储能分布式光伏系统并网点电压调整方案设计

Design of Regulation Strategy for Voltage Level at Common Coupling Node in Distributed PV System with Energy Storages Devices

  • 摘要: 随着配电网中光伏渗透率不断升高,分布式光伏对配电网电压质量和稳定性影响日益增大。分析了分布式光伏并网引起并网点电压变化的机理,在配备储能装置的分布式光伏发电系统典型结构基础上,提出了有功/无功-电压调节的系统控制方案。在有功电压调节回路中设置了具有施密特电路特性的死区控制环节,一方面死区控制可以保证无功调节优先性,另一方面由于有功电压调节的灵敏度较高,死区控制可能导致并网点电压在死区阈值电压附近频繁抖动,通过施密特电路设置不同的正/反向死区阈值电压可以有效消除抖动现象。仿真结果表明所提方案能有效处理光伏出力骤变、大容量负载投切、配电网自身扰动等引起的并网点电压质量问题。

     

    Abstract: With the increased penetration of photovoltaic (PV) power in distribution network, the influence of distributed PV on voltage quality and stability of distribution network keeps increasing. Mechanism of PCC (point of common coupling) voltage variations caused by grid connected PV system is analyzed, and active/reactive power voltage regulation strategy is proposed based on a typical structure of distributed PV systems with energy storage devices. Dead zone with Schmitt circuit characteristics is set in active power and voltage control loop to ensure the priority of reactive power control. Dead zone control may cause frequent voltage shake near the threshold voltage value due to high sensitivity of active power regulation. Then different positive/negative threshold voltage in Schmitt circuit can effectively eliminate voltage shaking phenomenon. Simulation results show that the proposed scheme can effectively deal with voltage problems caused by sudden changes in solar power output, high capacity load switching and distribution network disturbances.

     

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