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Research on control strategy of photovoltaic grid connected converter under voltage distortion

机译：电压畸变下光伏并网逆变器的控制策略研究

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Aiming at the problem that the power grid voltage distortion caused by non-linear loads such as electric arc furnace loads in the distributed power grid causes photovoltaics to fail to be effectively connected to the grid, a dynamic analysis of the distribution network voltage is required and a new phase-locked loop based technology is used. The control strategy of the grid-connected converter is to reduce the harmonic distortion rate when the photovoltaic grid is connected to the grid and improve the quality of the grid-connected current and grid-connected voltage. A typical dynamic model of the electric arc furnace and a Photovoltaic system model are established. By analyzing the impact of the electric arc furnace model on the grid-connected photovoltaic grid-connected converter with a traditional phase-locked loop when it is connected to the grid, a self-regulating Control Strategy of SOGI’s Phase-locked Loop Photovoltaic Grid-connected Converter. Finally, the arc furnace simulation module and photovoltaic system simulation module were customized through the PSCAD / EMTDC software platform, and the feasibility of the control strategy was verified through simulation analysis.
机译：针对由分布式电网中的电弧炉负荷等非线性负荷引起的电网电压畸变，导致光伏无法有效连接到电网的问题，需要对配电网电压进行动态分析，使用了一种新的基于锁相环的技术。并网变流器的控制策略是降低光伏并网时的谐波畸变率，提高并网电流和并网电压的质量。建立了电弧炉的典型动力学模型和光伏系统模型。通过分析电弧炉模型对带有传统锁相环的并网光伏并网变流器与电网连接时的影响，SOGI的一种自调节控制策略-锁相环光伏电网-连接的转换器。最后，通过PSCAD / EMTDC软件平台定制了电弧炉仿真模块和光伏系统仿真模块，并通过仿真分析验证了控制策略的可行性。

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