Due to several problems such as global concern about environmental pollution, renewable energy has become an alternative source of energy. In situations such as small local loads far from the main grid, standalone hybrid power system (HPS) with inevitable unbalanced loading condition is preferred for the global grid. The four-leg inverter with a simple as well as well-performance control method is a good solution to support this condition. In this paper, with respect to the average and discretized model of the inverter, a new digital controller is proposed in the abc reference frame to control the load voltages. The proposed controller offers several advantages such as simplicity, fast dynamic response, no need for transformation among different reference frames, and full compatibility with digital implementation which makes it as an excellent option to be employed in such systems. In addition, a new hybrid controller is also proposed which not only has the advantages of the proposed digital controller but also shows superior performance under nonlinear loads without imposing a high computational burden. To verify the effectiveness of the two proposed controllers, several simulation and experimental tests under different scenarios on a 3 kW setup are performed.

中文翻译：

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一种用于不平衡负载的独立光伏系统的新型混合控制器

由于全球对环境污染等问题的关注，可再生能源已成为一种替代能源。在远离主电网的局部负载较小的情况下，具有不可避免的负载不平衡条件的独立混合电力系统（HPS）是全球电网的首选。具有简单且性能良好的控制方法的四脚逆变器是支持这种情况的良好解决方案。在本文中，针对逆变器的平均和离散模型，在 abc 参考系中提出了一种新的数字控制器来控制负载电压。所提出的控制器具有多种优点，例如简单、动态响应快、无需在不同参考系之间进行转换、并且与数字实现完全兼容，这使其成为在此类系统中使用的绝佳选择。此外，还提出了一种新的混合控制器，它不仅具有所提出的数字控制器的优点，而且在非线性负载下表现出卓越的性能，而不会带来高计算负担。为了验证两个提出的控制器的有效性，在 3 kW 设置的不同场景下进行了几次模拟和实验测试。