【摘要】 由于分布式电源自身容量、线路阻抗不同等原因,在并联系统中采用传统下垂控制策略,不仅会造成各微源不能按照相对应的下垂系数进行无功功率均分,也会影响电能质量,为此提出一种基于虚拟阻抗的改进下垂控制策略,首先分析了功率均分机理及影响因素,在此前提下通过引入虚拟阻抗削弱系统中的功率耦合关系,同时对电压和频率进行调节,从而实现系统的功率均分并保障电压与频率的稳定输出;最后在Matlab/Simulink环境中验证了该控制策略的可行性与有效性。该改进策略保证了有功负荷与无功负荷在各分布式电源间的合理分配,提高了能量利用率与系统稳定性。更多还原

【Abstract】 Due to different capacity of distributed power supply and different impedance of the line,the traditional droop control strategy in the parallel system will not only cause the micro-sources can not share the reactive power according to the corresponding droop coefficients,but also affect the power quality.So,improved droop control based virtual impedance was proposed in this paper.Firstly,the power sharing mechanism and its influencing factors were analyzed.Under this premise,the power coupling was reduced by introducing virtual impedance in the system,and the voltage and frequency were adjusted simultaneously.Thus,it achieved the system power sharing and maintained the stable output of voltage and frequency.The feasibility and effectiveness of the control strategy were verified in the Matlab/Simulink environment.The proposed strategy guarantees the reasonable allocation of active and reactive loads among distributed power sources,and improves energy efficiency and system stability.更多还原