Control Strategy for Low Voltage Ride Through (LVRT) Operation of Two-Stage Photovoltaic Power Generation System

Lihua Li, Hong Zhou, F. Luo, Xiangyang Lin, Yang Han
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引用次数: 4

Abstract

This paper presents an improved low voltage ride through (LVRT) control strategy for the two-stage photovoltaic (PV) power generation system by adding discharging circuit at the DC-link of the inverter and modifying the active and reactive current reference to the DC/AC inverter when grid voltage sag occurs. The 500kVA two-stage photovoltaic power system model is built in PSCAD/EMTDC platform, which consists of PV arrays, Boost converter and 3-phase DC/AC inverter. The maximum power point tracking (MPPT) control scheme is adopted in the Boost converter, and the dual-loop control structure is utilized for the DC/AC inverter, where the outer voltage loop is used for maintaining DC-link voltage, and the inner current loop is used for improving dynamic response for current tracking. Also, a separate DC voltage loop is adopted in the discharging circuit for the LVRT operation. Simulation in PSCAD/EMTDC platform verifies the validity of the proposed control strategies under symmetrical voltage sag conditions
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两级光伏发电系统低压穿越运行控制策略
本文提出了一种改进的两级光伏发电系统低压穿越(LVRT)控制策略,该策略通过在逆变器直流环节增加放电电路,并在电网电压暂降时修改直流/交流逆变器的有功和无功参考电流。在PSCAD/EMTDC平台上构建500kVA两级光伏发电系统模型,该系统由光伏阵列、Boost变换器和三相DC/AC逆变器组成。Boost变换器采用最大功率点跟踪(MPPT)控制方案,DC/AC逆变器采用双环控制结构,其中外电压环用于维持直流链路电压,内电流环用于改善电流跟踪的动态响应。LVRT的放电回路采用单独的直流电压环路。在PSCAD/EMTDC平台上的仿真验证了所提控制策略在对称电压暂降条件下的有效性
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