光储并一体化变换器的多模态控制与分析

Multi Model Control and Stability Analysis of the Integrated Photovoltaic,Energy-storage and Grid-connected Converter

以光伏电池为微电源并集成储能设备的微电网通常包含光伏变换器、储能变换器等多台电力电子变换装置,系统中存在多个变换器将增加其成本,影响其稳定性,限制其应用推广。针对中小功率应用场合,将光伏变换器与储能变换器的功能集成,仅使用一台两级式变换器实现光伏组件与储能设备的接入,基于此新型系统结构,提出一种光储并一体化的控制策略实现微电网多模态控制功能,特别针对光伏接口电路应用限功率控制策略以减小系统功率平衡对储能设备的依赖性。研制了一台15 kVA光储并一体化实验样机,实验验证了光储并一体化系统结构与控制策略的可行性及稳定性分析的有效性。

Micro-grid converter integrated photovoltaic and energy-storage typically contains several power electronic devices,such as photovoltaic converter and energy-storage converter.The increasing number of converters will have a deep influence on the cost,stabilization and application of the system.For the low-power applications,a novel integrated photovoltaic and energy-storage micro-grid-connected converter is proposed and a two stage converter is used to realize the photovoltaic module and the energy-storage device access.Based on the new structure,an integrated control strategy is applied to realize the multi model control of the micro-grid.Especially,the photovoltaic interface with the limited power mode reduced the dependence of the energy-storage power balance.Finally,a 15 kVA prototype is built to verify the feasibility of structure and control strategy and the effectiveness of stability analysis.