电力设备检测实验室专用微电网接入结构设计及功率控制方法

Access Structure Design and Power Control Algorithm of Specialized Microgrid in Electric Power Equipment Testing Laboratory

针对传统微电网无法满足电能高质量领域的电源需求,以电力设备检测实验室的测试电源为研究案例,提出了串联型分布式电源单元(DG)的接入结构,同时为了减少功率分配误差并提高电压的稳定性,提出了功率因数/频率反下垂控制方法。研究结果表明:采用串联型的微电网接入结构以及反下垂控制方法,可以实现DG单元的有功和无功功率均分,减少功率分配误差,从而实现DG单元的电压波形同步,解决了DG单元电压相角不同造成的功率不匹配问题,同时提高了公共连接点(PCC)的电压幅值,保证了电源电压的稳定运行。通过研究发现,采用这种微电网接入结构以及功率控制方法可以为微电网系统提供精准功率控制、电压稳定的电源,该电源可以满足电力设备检测实验室的测试要求。

In allusion to the application limitations of micro-grid in the domain with high-quality power of electric power equipment testing laboratory as the case study,we presented a series micro-grid access structure with distributed generation distributed generation（DG）,and proposed a power factor/frequency inverse droop control method to reduce power distribution error and improve voltage instability.The results show that the series micro-grid and inverse droop control method can realize the equipartition of active and reactive power between DG units,and reduce power distribution error; voltage waves of DG units can be synchronized to resolve the power mismatch caused by the phase angle difference of DG units,and improve the voltage amplitude of point of common coupling（PCC） and the voltage instability.The research results show that the access structure and power control algorithm of specialized micro-grid can provide the electromagnetic compatibility laboratory for micro-grid generation with accurate power control and voltage instability,and this supply can meet the test requirements of electric power equipment testing laboratory.