Real-Time Coordinated Voltage Control of PV Inverters and Energy Storage for Weak Networks With High PV Penetration
Real-Time Coordinated Voltage Control of PV Inverters and Energy Storage for Weak Networks With High PV Penetration
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DOI：
10.1109/tpwrs.2018.2789897
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发表时间：
2018-05-01
影响因子：
6.6
通讯作者：
Saha, Tapan Kumar
中科院分区：
文献类型：
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作者：
Wang, Licheng;Bai, Feifei;Saha, Tapan Kumar
由于廉价土地的可用性，在农村地区建立了更多的大型光伏电站。然而，这些地区的配电网传统上具有低X/R比的馈线，这使得独立无功补偿方法对电压调节的效果较差。因此，上游阶跃稳压器（SVR）可能遭受过多分接操作与pv诱导的快速电压波动。虽然电池储能系统（BESS）可以成功地平滑光伏发电，但频繁的充放电将极大地影响其成本效益。本文设计了一种实时协调光伏逆变器和BESS进行电压调节的方法。为了跟上光伏功率的快速波动，该方法将在每5 s的控制周期内执行。此外，BESS的充放电功率采用主动调节方法自适应返回，以避免BESS长期过早能量耗尽。最后，通过电压裕度控制方案，在不通信的情况下，协调上游SVR和下游PV逆变器、BESS进行电压调节。该研究通过实时数字模拟器MatLab联合仿真平台进行验证，将为公用事业和光伏业主提供有价值的见解和适用策略，以实现大规模光伏农场整合到农村网络中。
There are more large-scale photovoltaic (PV) plants being established in rural areas due to availability of low-priced land. However, distribution grids in such areas traditionally have feeders with low X/R ratios, which makes the independent reactive power compensation method less effective on voltage regulation. Consequently, upstream step voltage regulator (SVR) may suffer from excessive tap operations with PV-induced fast voltage fluctuations. Although a battery energy storage system (BESS) can successfully smooth PV generation, frequent charge/discharge will substantially affect its cost effectiveness. In this paper, a real-time method is designed to coordinate PV inverters and BESS for voltage regulation. To keep up with fast fluctuations of PV power, this method will be executed in each 5 s control cycle. In addition, charging/discharging power of BESS is adaptively retuned by an active adjustment method in order to avoid BESS premature energy exhaustion in a long run. Finally, through a voltage margin control scheme, the upstream SVR and downstream PV inverters and BESS are coordinated for voltage regulation without any communication. This research is validated via a real-time digital simulator MatLab cosimulation platform, and it will provide valuable insights and applicable strategies to both utilities and PV owners for large-scale PV farm integration into rural networks.