基于逆变器直流电压模式波能装置并网接入方法

GRID CONNECTION FOR MULTI HPGS IN WEC BASED ON INVERTER IN DC VOLTAGE MODE

针对采用蓄电池提供直流母线电压难于满足波能装置装机容量不断增长需求的问题,提出基于逆变器直流电压模式的多液压发电机组并网接入方法。逆变器为液压发电机组直接提供直流母线电压,组建成波能装置无蓄电池组支撑的直流纳电网。建立了逆变器直流电压模式电路拓扑和直流电压外环控制回路。通过多液压发电机组波能装置基于逆变器直流电压模式仿真试验,验证了无蓄电池组波能装置并网接入方法的可行性。该研究成果已应用到500 kW“长山号”波能装置中,为大功率波能装置并网系统研究奠定了基础。

The method of DC voltage supported by batteries is difficulty to meet the installed power increasing of wave energy converter(WEC). A grid connection method for multi hydraulic power generation set(HPGS)based on inverter in DC voltage mode is proposed.The DC voltage is supported by inverter for multi HPGSs,and DC nano grid without batteries is established in WEC. The topology of DC voltage mode of inverter and the control strategy of DC voltage outer feedback loop are established. Through the computer simulation test of multi HPGS based on inverter DC voltage mode,the feasibility of grid connection method of multi HPGS without batteries is verified.The research results have been applied to the 500 kW“Chang Shan Hao”WEC,which lays a foundation for the grid connection system of high power WEC.