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首页> 外文期刊>Electric power systems research >Dynamic Direct Voltage Controller (D~2VC) for grids with intermittent sources
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Dynamic Direct Voltage Controller (D~2VC) for grids with intermittent sources

机译：具有间歇源的网格动态直流电压控制器（D〜2VC）

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摘要

This work proposes a voltage regulator to solve quality issues at the point of common coupling (PCC) of distribution grids affected by the intermittency of renewable energy sources. The proposed solution is a voltage compensator based on single-phase voltage source converter (VSC) units, called Dynamic Direct Voltage Controller ((DVC)-V-2). The three-phase (DVC)-V-2 topology comprises three single-phase VSC back-to-back units. For each unit, one converter is connected in series with the grid at the PCC and the other converter is connected in shunt similar to an UPFC (Unified Power Flow Controller). To avoid coupling transformer, the series converter is directly connected in series to the existing distribution transformer thus no extra transformer is necessary. The (DVC)-V-2 can regulate the three-phase voltage profile at the PCC and balance all phases independently. The control strategy for each series converter is based on the estimation of the instantaneous symmetrical components of the voltage. Simulation results using PSCAD/EMTDC and an experimental platform of the (DVC)-V-2 are shown to confirm all the (DVC)-V-2 advantages in grids with resistive lines (R X). The proposed solution is much lighter and effective than the conventional indirect voltage control (reactive power control) and more robust than on load tap changer transformer.
机译：这项工作提出了一种电压调节器，以解决受再生能源间歇性影响的分布网格的共同耦合点（PCC）的质量问题。所提出的解决方案是基于单相电压源转换器（VSC）单元的电压补偿器，称为动态直流电压控制器（（DVC）-V-2）。三相（DVC）-V-2拓扑结构包括三个单相VSC背对背单元。对于每个单元，一个转换器与PCC的网格串联连接，另一个转换器与UPFC（Unified Power Flow Controller）的分流器连接。为避免耦合变压器，串联转换器直接串联连接到现有的配电变压器，因此不需要额外的变压器。 （DVC）-V-2可以调节PCC的三相电压曲线并独立平衡所有阶段。每个串联转换器的控制策略基于估计电压的瞬时对称分量。使用PSCAD / EMTDC的仿真结果和（DVC）-V-2的实验平台显示在具有电阻线（R > X）的网格中确认所有（DVC）-V-2优势。所提出的解决方案比传统的间接电压控制（无功功率控制）更轻，有效，而不是负载分接开关变压器更稳定。

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