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首页> 外文期刊>Renewable Power Generation, IET >To study unplanned islanding transient response of microgrid by implementing MSOG and SRF-PLL based hierarchical control in the presence of non-linear loads
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To study unplanned islanding transient response of microgrid by implementing MSOG and SRF-PLL based hierarchical control in the presence of non-linear loads

机译：通过在非线性负载的存在下实现MSOG和SRF-PLL基于SRF-PLL的分层控制来研究MicroGrid的无计划岛瞬态响应

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摘要

This study considers the hierarchical control of microgrid and harmonic compensation of non-linear load specially in transition from grid-connected to unplanned islanding. The proposed controllers are based on the stationary reference frame with hierarchical control levels (inner, primary, and secondary). In the inner control loop, proportional and multi-resonant voltage and current controllers for three-phase voltage source inverters are proposed. Moreover, a droop control is used to share active and reactive power in the primary control loop. To achieve decoupled active and reactive power sharing, virtual impedance loop is implemented, too. The mentioned procedure increases the total impedance and consequently reduces the initial current and subsequently facilitates the continuous connection of DGs to the MG. To attain smoother transition, selective harmonic virtual impedance is applied by multiple second-order generalised integrator module to extract the fundamental positive sequence and harmonic components of the output current of the DGs. In secondary control level, synchronisation procedure is considered to make connection and restoration by the advanced three-phase synchronous reference frame PLL with in-loop moving average filter which significantly enhances its disturbance rejection capability. The results are shown smoother transition, robustness, and high performance of the proposed hierarchical control VSIs during variation of system configuration.
机译：本研究考虑了微电网和谐波补偿的分层控制，特别是从网格连接到计划外岛的过渡的非线性负荷的谐波补偿。所提出的控制器基于具有分层控制级别的静止参考帧（内部，主要和次要）。在内部控制回路中，提出了用于三相电压源逆变器的比例和多谐振电压和电流控制器。此外，DROOP控制用于在主控制回路中共享主动和无功功率。为了实现解耦的主动和无功分配，也实现了虚拟阻抗循环。所提到的过程增加了总阻抗，从而降低了初始电流，随后促进DGS对MG的连续连接。为了获得更光滑的转换，选择性谐波虚拟阻抗由多个二阶广义集成器模块应用，以提取DGS输出电流的基本正序和谐波分量。在二次控制水平中，认为同步过程通过先进的三相同步参考帧PLL与环路移动平均滤波器进行连接和恢复，这显着增强了其干扰抑制能力。在系统配置的变化过程中，结果示出了所提出的分层控制VSI的更平滑的转换，鲁棒性和高性能。

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