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A Power-Decoupled Current-Source Inverter for PV Energy Harvest and Grid Voltage Regulation

机译：用于光伏能量收集和电网电压调节的功率解耦电流逆变器

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摘要

The single-phase microinverter (SMI) is becoming one of the most cost-efficient interfaces for bridging photovoltaics (PV) and power systems. However, in the maximum power point tracking operation, the SMI injects an intermittent active power to the grid, which leads to voltage variations at the point of common coupling (PCC). This certainly dampens the power quality of grids. Besides, the power mismatch between the dc and ac terminals of SMIs will render a double-line-frequency pulsating power at the dc terminal, which inevitably increases the power ratings of the circuit components of the SMIs. To address these issues simultaneously, a power-decoupled current-source inverter (PD-CSI) is proposed in this article. The PD-CSI can provide the required reactive power compensation for regulating the PCC voltage. Meanwhile, it is imbedded with an active power decoupling circuit, which can actively store the double-line-frequency pulsating power in a film capacitor so that the PV can be operated at a constant dc current. The state-space model and steady-state operation of the PD-CSI are elaborated. The controllers are designed for achieving the active power decoupling operation and the PCC voltage stabilization. Experimental and simulation results in an 110-V ac microgrid have been provided to validate the simultaneous functionalities of the active power decoupling and grid voltage regulation for the proposed PD-CSI.
机译：单相微逆变器（SMI）成为桥接光伏（PV）和电力系统最具成本效益的界面之一。然而，在最大功率点跟踪操作中，SMI向网格注入间歇的有效电力，这导致公共耦合点（PCC）处的电压变化。这肯定会阻碍电网的电力质量。此外，SMIS的DC和AC端子之间的功率不匹配将在DC端子处呈现双线频率脉动功率，这不可避免地增加SMI的电路部件的电力额定值。为了同时解决这些问题，本文提出了一种电源解耦电流源逆变器（PD-CSI）。 PD-CSI可以提供用于调节PCC电压所需的无功补偿。同时，具有有源功率去耦电路嵌入，其可以在胶片电容器中主动地存储双线频率脉动功率，使得PV可以在恒定的DC电流下操作。阐述了PD-CSI的状态空间模型和稳态操作。控制器设计用于实现有功功率去耦操作和PCC电压稳定。已经提供了110V AC微电网的实验和仿真结果，以验证所提出的PD-CSI的有源功率去耦和电网电压调节的同时函数。

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