高渗透率分布式光伏系统谐波与电压控制

高渗透率分布式光伏发电接入后，对电网谐波、电压波动和闪变产生了不利影响。重点分析了高渗透率分布式光伏接入时电网谐波产生的原理，及传统的αβ轴电网电压前馈控制算法导致的弱电网谐波增大的问题。针对谐波抑制，提出了自适应前馈控制算法，该算法通过智能过渡逻辑作用于dq轴和αβ轴进行前馈控制，可智能识别电网环境，同时结合陷波器高增益特点，达到抑制背景次谐波电压作用于前向通道、减小谐波含量、提高系统的鲁棒性的作用。针对分布式光伏接入带来的电网电压波动及闪变问题，通过调整逆变器群的动态无功响应和无功功率控制能力来有效抑制电网电压波动和闪变，支撑电网，增强电网接入的友好性。

Harmonic and Voltage Control of Distributed Photovoltaic System with High Permeability

After the integration of distributed photovoltaic power generation with high-permeability， the power grid is adversely affected by harmonics，voltage fluctuation and flicker. This paper focuses on analyzing the principle of harmonic generation in the grid when integrating distributed photovoltaic system with high-permeability into the grid， and the problem that the voltage feedforward control algorithm based on traditional αβaxis causes the increase of the harmonics in a weak grid. For harmonic suppression， this paper proposes an adaptive feedforward control algorithm. The algorithm uses intelligent transition logic to act on dq axis and αβ axis for feedforward control， intelligently identifying the grid environment. At the same time， it combines the high gain characteristics of wave trap to suppress the background sub-harmonic voltage from the forward channel， reduce the harmonic content and improve the robustness of the system. Targeting the voltage fluctuation and flicker caused by the integration of the distributed photovoltaic system，the dynamic reactive power response and reactive power control capability of inverters is regulated to suppress the voltage fluctuation and flicker effectively， thereby supporting the grid and enhancing the friendliness of the grid.