Abstract
In the medium voltage cascaded converter, the power imbalance problem among the converter modules will result in certain converter modules over-modulated. Reactive power control (RPC) scheme is an effective way to balance the cascaded converters. Many efforts, such as reactive power sharing control and apparent power sharing control have been used to solve the overmodulation issue. This paper investigates an optimization RPC scheme to solve the overmodulation problem by minimizing the total required reactive power. An improved minimum reactive power (IMRP) RPC scheme is presented, the feasible area for the active power imbalance is evaluated and compared with the reactive power sharing control scheme and the apparent power sharing control scheme. Finally, the control scheme is verified on a three-module scaled-down cascaded inverter.
Highlights
Declining the cost of photovoltaic generation has promoted the rapid growth of PV installations [1], [2]
In [14], a reactive power control strategy is proposed for improving the converter’s adaptability to the power imbalance. In this Reactive power control (RPC) scheme, the reactive power is evenly distributed to each power module, which is called as reactive power sharing (RPS) scheme
In [15], another RPC scheme is proposed where the apparent power of each power module is equal, which is called as apparent power sharing (APS) scheme
Summary
Declining the cost of photovoltaic generation has promoted the rapid growth of PV installations [1], [2]. In [14], a reactive power control strategy is proposed for improving the converter’s adaptability to the power imbalance In this RPC scheme, the reactive power is evenly distributed to each power module, which is called as reactive power sharing (RPS) scheme. In [15], another RPC scheme is proposed where the apparent power of each power module is equal, which is called as apparent power sharing (APS) scheme This control scheme efficiently improves the adaptability to the power imbalance, and the required reactive power is higher during some imbalance conditions, which will increase the power losses. Due to the limitation of the modulation ratio, the RPC scheme is a more efficient method for the module active power imbalance problem. This paper proposes an improved reactive power control scheme of enhancing adaptability to the power imbalance.
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