In this article, a novel pulsewidth modulation (PWM) technique is proposed for an existing space vector hysteresis current controller (SVHCC) scheme. A three-level neutral-point-clamped (NPC) inverter is used for dual purpose of shunt active power filtering and solar photovoltaic (PV) power integration to a distribution grid. This dual-purpose NPC inverter utilizes the proposed PWM technique for solving the neutral-point voltage-balancing issue in a unique way. Due to the inherent advantages of the SVHCC, the current control is characterized by fast action and optimal switching. A single reference current required for both filtering and maximum PV power integration is generated using instantaneous power theory, where a diode bridge rectifier load is considered to demonstrate the controller performance while compensating nonlinear current components. Thus, not only a unique space-vector-based PWM technique is adopted for fast-tracking of currents, but also a sliding current error boundary is used for the first time. This sliding technique tackles the dc-link balance issue of the NPC inverter while controlling the output currents simultaneously. The simulation and hardware results prove the aforementioned performance and demonstrate the efficacy of the proposed PWM current controller.

中文翻译：

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应用于分布式发电接口三电平NPC逆变器的滞环电流控制器PWM方案


在本文中，针对现有的空间矢量磁滞电流控制器（SVHCC）方案提出了一种新颖的脉宽调制（PWM）技术。三电平中性点钳位 (NPC) 逆变器具有并联有源电力滤波和太阳能光伏 (PV) 电力并入配电网的双重用途。这种两用 NPC 逆变器利用所提出的 PWM 技术以独特的方式解决中点电压平衡问题。由于SVHCC的固有优势，电流控制具有动作快、切换最优的特点。使用瞬时功率理论生成滤波和最大光伏功率集成所需的单个参考电流，其中考虑二极管桥式整流器负载来演示控制器性能，同时补偿非线性电流分量。因此，不仅采用了独特的基于空间矢量的PWM技术来快速跟踪电流，而且首次使用了滑动电流误差边界。这种滑动技术解决了 NPC 逆变器的直流链路平衡问题，同时控制输出电流。仿真和硬件结果证明了上述性能并证明了所提出的 PWM 电流控制器的有效性。