This article presents control strategies developed with two-level coordinated and double loop control for a standalone microgrid. The interfacing inverter is controlled to perform multifunctions. It incorporates the compensation for power quality problems at the point of common coupling and controls the voltage and frequency deviation to provide a constant voltage and frequency to connected ac loads in standalone and grid-connected operating modes. The power demand during battery charging and discharging is controlled using a buck–boost converter. To control overshoot and settling time while following a dc and sinusoidal references without losing control during the transition, proportional-integral, and proportional-resonant controllers with optimal gain designs are reinforced by antiwindup feedback. To ensure a soft and secure transition, even under disturbances, such as distortions and notches, an enhanced phase-locked loop is used. The performance of this system is simulated in MATLAB and validated on a 2-kW laboratory prototype.

中文翻译：

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独立微网无缝转移两级协调控制的实现

本文介绍了针对独立微电网采用两级协调和双回路控制开发的控制策略。接口逆变器被控制以执行多功能。它在公共耦合点对电能质量问题进行补偿，并控制电压和频率偏差，以在独立和并网运行模式下为连接的交流负载提供恒定的电压和频率。电池充电和放电期间的功率需求使用降压-升压转换器进行控制。为了控制过冲和稳定时间，同时遵循直流和正弦参考而不在转换期间失去控制，具有最佳增益设计的比例积分和比例谐振控制器通过抗饱和反馈得到加强。为确保顺利和安全的过渡，即使在失真和陷波等干扰下，也会使用增强型锁相环。该系统的性能在 MATLAB 中进行了仿真，并在 2 千瓦实验室原型上进行了验证。