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首页> 外文期刊>Electric power systems research >Voltage, var and watt optimization for a distribution system with high PV penetration: A probabilistic study
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Voltage, var and watt optimization for a distribution system with high PV penetration: A probabilistic study

机译：具有高PV渗透性的配电系统的电压，无功和功率优化：概率研究

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摘要

High penetration of rooftop photovoltaic (PV) panels in the distribution grid can affect the node voltages, and under light loading conditions, may even result in reverse power flow and localized overvoltage instances. While voltage control at the distribution grid level has been traditionally addressed using voltage and var control (VVC) techniques, with the introduction of PV resource as well as active demand, the problem needs to be reformulated as voltage, var and watt optimization (VVWO). A mixed-integer nonlinear multi-objective optimization solution has been proposed in this paper for the control of active and reactive power resources in an unbalanced distribution grid with high PV penetration. The goal of the proposed methodology is to simultaneously minimize line losses, active power curtailment of PVs, demand curtailment, and operation instances of voltage regulating transformers and shunt capacitors. Due to the stochastic nature of load and solar irradiance, at each PV penetration level the problem is solved probabilistically by using random samples for network loading levels and cloud coverage in the sky. A case study is presented using a modified version of the IEEE 123-bus test distribution feeder. Simulation results indicate that if voltages and reactive powers are optimally controlled, high PV penetration levels can be achieved at the distribution grid without any complications. It is also observed that allowing PVs to exchange reactive power with the grid can significantly affect the operation of voltage regulators and shunt capacitors.
机译：屋顶光伏（PV）面板在配电网中的高度渗透会影响节点电压，在轻负载条件下，甚至可能导致反向潮流和局部过电压情况。尽管传统上已使用电压和无功控制（VVC）技术解决了配电网级的电压控制，但由于引入了PV资源以及有效需求，该问题需要重新定义为电压，无功和瓦特优化（VVWO） 。提出了一种混合整数非线性多目标优化解决方案，用于控制具有较高PV穿透力的不平衡配电网中的有功和无功功率资源。所提出方法的目标是同时最小化线路损耗，PV的有功功率削减，需求削减以及调压变压器和并联电容器的工作实例。由于负载和太阳辐照度的随机性，在每个PV渗透级别，通过使用随机样本进行网络负载级别和天空云量的覆盖，可以概率性地解决该问题。通过使用IEEE 123总线测试分配馈送器的修改版，进行了案例研究。仿真结果表明，如果可以最佳地控制电压和无功功率，则可以在配电网实现高PV渗透水平，而不会带来任何复杂性。还观察到，允许PV与电网交换无功功率会严重影响稳压器和并联电容器的运行。

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