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首页> 外文期刊>IEEE Transactions on Energy Conversion >An Improved Reactive Current Detection and Power Control Method for Single-Phase Photovoltaic Grid-Connected DG System
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An Improved Reactive Current Detection and Power Control Method for Single-Phase Photovoltaic Grid-Connected DG System

机译：单相光伏并网发电系统的一种改进的无功电流检测和功率控制方法

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摘要

In the single-phase photovoltaic (PV) grid-connected distributed generation (DG) system located at the end of the feeder, it is necessary to provide quickly active and reactive power to the local loads. In this paper, an improved reactive current detection and power control method are proposed to realize active power control and reactive power compensation. To detect quickly the loads reactive current, a fast reactive current detection method using the derivative and $i_{p}!!-!!i_{q}$ algorithm is presented, and it can overcome the long delay in a conventional phase-shift method. In the inner current loop, the quasi-proportional-resonant (QPR) control method with grid voltage feed-forward is presented to control accurately the grid current with zero steady error, and to reduce the current distortion due to the frequency offset and distortion of the grid voltage. The inner loop stability is analyzed, and the proper parameters are selected. In the outer loop, proportional–integrator (PI) controller is applied to stabilize the dc-link voltage, and power feed-forward is introduced to speed up system response. Simulation and experimental results verified the validity of the proposed control method.
机译：在馈线末端的单相光伏（PV）并网分布式发电（DG）系统中，有必要为本地负载提供快速的有功和无功功率。提出一种改进的无功电流检测和功率控制方法，以实现有功功率控制和无功补偿。为了快速检测负载的无功电流，提出了一种使用导数和$ i_ {p} !!-!! i_ {q} $算法的快速无功电流检测方法，该方法可以克服传统相移中的长时间延迟。方法。在内部电流环路中，提出了具有电网电压前馈的准比例谐振（QPR）控制方法，以精确控制电网电流且稳态误差为零，并减少了由于频率偏移和谐波失真引起的电流失真。电网电压。分析内部回路的稳定性，并选择适当的参数。在外部环路中，应用了比例积分器（PI）控制器来稳定直流链路电压，并引入了功率前馈以加快系统响应。仿真和实验结果验证了该控制方法的有效性。

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