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首页> 外文期刊>Power Electronics, IET >Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance
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Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance

机译：在频率变化和网络不平衡期间，虚拟同步参考系中电压源逆变器的直接功率控制

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摘要

This study proposes a direct power control (DPC) scheme for grid-connected voltage source inverter (VSI) in a virtual synchronous reference frame during frequency variations and network unbalances. The proposed DPC scheme applies a virtual phase angle instead of the voltage phase angle acquired by the phase-locked loop (PLL) for coordinated transformations. This approach can eliminate the PLL and its low-frequency-oscillatory behaviours during the frequency variations. Meanwhile, two available control targets, that is, smooth active power and smooth reactive power, are defined for the VSI operation during network unbalance. In the proposed DPC scheme, the reduced-order vector integrator is employed to directly regulate the power pulsations caused by the voltage unbalances. Consequently, it can eliminate both the sequential separations of the voltages/currents and the complex calculations of the power compensating components. Then, based on the mathematical model of the VSI control system, the control performance, including the steady-state power errors and the system stability, is fully analysed. Finally, both the simulation and experimental results are provided to confirm the effectiveness of the proposed DPC scheme.
机译：这项研究针对频率变化和网络不平衡期间的虚拟同步参考系中的并网电压源逆变器（VSI），提出了一种直接功率控制（DPC）方案。提出的DPC方案将虚拟相位角而不是由锁相环（PLL）获取的电压相位角用于协调变换。这种方法可以消除频率变化期间的PLL及其低频振荡行为。同时，为网络不平衡期间的VSI操作定义了两个可用的控制目标，即平滑有功功率和平滑无功功率。在提出的DPC方案中，采用降阶矢量积分器直接调节由电压不平衡引起的功率脉动。因此，它既可以消除电压/电流的顺序分离，又可以消除功率补偿组件的复杂计算。然后，基于VSI控制系统的数学模型，对包括稳态功率误差和系统稳定性在内的控制性能进行了全面分析。最后，提供了仿真和实验结果以确认所提出的DPC方案的有效性。

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