The hysteresis current controllers (HCC) for grid-connected inverter (GCI) system is a well-known controller for its robustness, fast reference tracking, better dynamics, and easier implementation compared to other controllers. This article proposes a modified double-band HCC (MDBHCC) for single-phase GCI system with LCL -filter. The proposed algorithm implements an unipolar symmetrical pulse width modulation (PWM) strategy for reducing inverter switching losses through a sequential logic, with an adaptive clock. It improves the variation in switching frequency and limits the maximum switching frequency of HCC while enhancing the total harmonic distortion (THD) of the injected current into the grid. In order to alleviate power quality problems, two such MDBHCC schemes, i.e., MDBHCC1 and MDBHCC2, are implemented. Where MDBHCC2 operates at the higher switching frequency with lesser % THD and MDBHCC1 operates at lower switching frequency. Simulation and experimental results are presented with a significant decrease in switching frequency and an improvement in grid current harmonics at both steady-state and dynamic conditions.

中文翻译：

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一种改进的用于并网逆变器系统的磁滞电流控制器，以降低开关频率解决电源质量问题

与其他控制器相比，用于并网逆变器（GCI）系统的磁滞电流控制器（HCC）是众所周知的控制器，因为它的坚固性，快速的参考跟踪，更好的动态特性和易于实施的特性。本文针对单相GCI系统提出了一种改进的双频HCC（MDBHCC），该系统具有拼箱 -筛选。所提出的算法实现了单极性对称脉宽调制（PWM）策略，以通过具有自适应时钟的时序逻辑来减少逆变器的开关损耗。它改善了开关频率的变化并限制了HCC的最大开关频率，同时增强了注入电网的电流的总谐波失真（THD）。为了缓解电能质量问题，实现了两种这样的MDBHCC方案，即MDBHCC1和MDBHCC2。MDBHCC2在较高的开关频率下以较小的总谐波失真（THD）运行，而MDBHCC1在较低的开关频率下运行。仿真和实验结果表明，在稳态和动态条件下，开关频率都显着降低，并且电网电流谐波得到了改善。