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A ground-isolated switched capacitor (SC) dc–dc converter-based current equalization scheme for partially shaded photovoltaic (PV) strings of a grid-connected system is presented. SC converters are compact, light, and have very high efficiency even for a wide variation in load under certain operating conditions. These features make them ideal for integration with the PV module for current equalization...
This paper proposes a grid-connected PV system based on the series Z-Source inverter, and also proposes an indirect DC-link voltage control method for the system. The operation principle of the system is presented. The current control strategy is also designed, which makes the output current synchronize with grid voltage, thus the system could transform power to utility grid with a unit power factor...
Stand-alone power systems (SPS) are attracting more and more interest with the global movement toward the distributed generation. Due to their disconnection to the power grid, they are suffering from poor load following capability under load variations. In order to solve this problem, this paper provides an AC power solution based on flywheel energy storage. The proposed flywheel system is characterized...
Recently, there has been a considerable increase of distributed generators (DGs) connected to the distribution network. Therefore, the concept of the microgrid has been developed. A microgrid is a cluster of DGs, loads and power storage devices that is typically connected to the distribution network via a single point of connection. Most DGs are connected to the microgrid via a power-electronic inverter...
A gate trigger unit (GTU) design is proposed based on cascaded H-bridge voltage reinjection multilevel voltage source configuration (MLVR-HB-VSC) for use in large power and voltage ratings. Specific Implementation of gate-level trigger was analysis to guarantee dynamic voltage balance of compactors in the circuit. Grid synchronization, judgment of edge state changes, capacitor voltage balance and...
The grid-connected inverter works as a controlled current source in grid-connected mode, while operates as a controlled voltage source in standalone mode. So in case of utility faults or intentional islanding, the inverter has to change its control strategy from current control to voltage control. This paper first proposed a multi-loop voltage controller with capacitor differential voltage feedback...
This paper describes the operation of a microgrid that contains a custom power park (CPP). The park may contain an unbalanced and/or nonlinear load and the microgrid may contain many distributed generators (DGs). One of the DGs in the microgrid is used as a compensator to achieve load compensation. A new method is proposed for current reference generation for load compensation, which takes into account...
DC injection is a critical issue in the distributed generation systems according to IEEE Std. 1547-2003. Unfortunately, few literatures discuss this problem. In this paper, a novel control strategy is proposed to achieve zero steady-state DC injection. The proposed idea stems from a well-known fact that a capacitor can block DC component naturally. Generally, this capacitor should be large enough...
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