【摘要】 提出了一种用于分布式发电并网变流器测试的波动电压发生装置方案,解决了分布式发电并网变流器在实际电网中不易测试的难题。该装置基于级联H桥拓扑,其电压等级可拓展,可高精度地输出频率为0.5~25Hz和波动幅值为0~10%基波电压幅值的波动电压,可模拟不平衡度可调节的三相不平衡电网,不平衡度范围为0~10%。它可以完成并网变流器对电网电压幅值和频率偏差,波动电压以及电网不平衡的适应能力等多种测试。本文分析了装置的工作原理,并以基于本文所提出装置拓扑的"35k V-6MW风机变流器低频扰动测试装置"上进行的现场实验为例,充分证明了这种波动电压发生装置用于分布式发电并网变流器测试的可行性和有效性。更多还原

【Abstract】 This paper presents a fluctuating voltage generation equipment for distributed generation grid-connected converter testing, which solves the challenge of testing distributed generation gridconnected converter in real power grid. The equipment is based on cascaded H-bridge structure, the voltage level of which is expandable. It can provide precise fluctuating voltage with fluctuating frequency ranging from 0.5Hz to 25 Hz and fluctuating amplitude ranging from 0% to 10% of the fundamental voltage amplitude, and can simulate unbalance-degree-adjustable three-phase unbalance power grid, and the unbalance degree ranges from 0 to 10%. The equipment can fulfill voltage amplitude and frequency deviation, fluctuating voltage and grid unbalance adaptability test of the grid-connected converter. This paper analyzes the operating principle of this testing equipment and takes the field experimental result of the "35k V-6MW wind turbine converter low-frequency disturbance testing equipment", which is based on the equipment topology proposed, as an example, sufficiently verifies the feasibility and effectiveness of utilizing this fluctuating voltage generation equipment for distributed generation grid-connected converter.更多还原