Reactive power injection strategies for single-phase photovoltaic systems considering grid requirements
Reactive power injection strategies for single-phase photovoltaic systems considering grid requirements
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DOI：
10.1109/apec.2014.6803335
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Yongheng Yang;Huai Wang;Frede Blaabjerg
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文献类型：
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作者：
Yongheng Yang;Huai Wang;Frede Blaabjerg
由于光伏（PV）系统的开发和安装仍在以异常快速的速度增长，因此相关的电网整合政策将发生变化，以便在电网中接受更多的光伏系统。下一代光伏系统将像传统发电厂一样在电网调节中发挥更积极的作用。在一些国家，与无功电流注入和通过无功功率控制的电压支持相关的低压穿越（LVRT）等辅助服务的要求已经生效。这些先进的功能可以由下一代光伏系统提供，并将在未来得到增强，以确保光伏系统的更有效和可靠的利用。鉴于此，本文对单相光伏系统的无功功率注入（RPI）策略进行了研究。RPI的可能性是：a）恒定平均有功功率控制，B）恒定有功电流控制，c）恒定峰值电流控制和d）热优化控制策略。所有这些战略都符合现行电网规范，但目标不同。在一个3kW单相光伏系统上进行了仿真验证。其他三个RPI策略的实验验证1千瓦的单相系统在低电压穿越运行模式。仿真结果表明了所提出的低电压穿越无功控制策略的有效性和可行性。还讨论了特征化策略的设计和实施考虑。
As the development and installation of photovoltaic (PV) systems are still growing at an exceptionally rapid pace, relevant grid integration policies are going to change consequently in order to accept more PV systems in the grid. The next generation PV systems will play an even more active role like what the conventional power plants do today in the grid regulation participation. Requirements of ancillary services like Low-Voltage Ride-Through (LVRT) associated with reactive current injection and voltage support through reactive power control, have been in effectiveness in some countries. Those advanced features can be provided by next-generation PV systems, and will be enhanced in the future to ensure an even efficient and reliable utilization of PV systems. In the light of this, Reactive Power Injection (RPI) strategies for single-phase PV systems are explored in this paper. The RPI possibilities are: a) constant average active power control, b) constant active current control, c) constant peak current control and d) thermal optimized control strategy. All those strategies comply with the currently active grid codes, but are with different objectives. The thermal optimized control strategy is demonstrated on a 3 kW single-phase PV system by simulations. The other three RPI strategies are verified experimentally on a 1 kW singe-phase system in LVRT operation mode. Those results show the effectiveness and feasibilities of the proposed strategies with reactive power control during LVRT operation. The design and implementation considerations for the characterized strategies are also discussed.