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This paper discusses the active and reactive power control method for a modular multilevel converter (MMC) based grid-connected PV system. The voltage vector space analysis is performed by using average value models for the feasibility analysis of reactive power compensation (RPC). The proposed double-loop control strategy enables the PV system to handle unidirectional active power flow and bidirectional...
This paper proposed an improved phase disposition pulse width modulation (PDPWM) for a modular multilevel inverter which is used for Photovoltaic grid connection. This new modulation method is based on selective virtual loop mapping, to achieve dynamic capacitor voltage balance without the help of an extra compensation signal. The concept of virtual submodule (VSM) is first established, and by changing...
A single-phase cascaded H-bridge multilevel inverter for a grid-connected photovoltaic (PV) system with nonactive power compensation is presented in this paper. To maximize the solar energy extraction of each PV string, an individual maximum power point tracking (MPPT) control scheme is applied, which allows the independent control of each dc-link voltage. A generalized nonactive power theory is applied...
In this paper, the operation principle of the Z-source inverter is analyzed in detail. According to the characteristics of allowed short-shrougt zero state in the Z-source inverter, SPWM control method of the Z-source inverter is obtained by inserting fixed short-shrougt zero state into zero state of SPWM. It is simple and easily implemented in practice. However, in inductive load condition the output...
A novel double-loop feedback control strategy of DVR based on proportional-resonant control is proposed. Compared with the traditional proportional-integral (PI) controller, the proportional-resonant controller applied to the output compensation voltage control strategy of DVR, can achieve tracking with zero static error for the reference signals of compensation voltage. Based on frequency characteristic...
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