新能源场站全工况下多逆变器并联驱动MGP的UPF控制

UPF control of multi-inverter parallel drive MGP in renewable energy station under full working conditions

针对逆变器并联驱动同步电机对(MGP)的id=0矢量控制,在MGP出力较大时,难以保证新能源通过MGP并网的有功传输效率的问题,结合同步电机在单位功率因数(UPF)状态下的特点,提出多逆变器并联驱动MGP的UPF控制策略。通过计算逆变器输出全为有功状态下的同步电动机定子d、q轴电流,来保证新能源通过MGP并网的有功传输效率;再利用磁链ψ与同步电动机定子d轴电流具备的负反馈特性来简化计算,并通过电流分配系数ki,使其适用于多台逆变器容量相等或不等、出力相同或不同的全工况应用场景,吻合工程实际。理论研究和仿真分析均表明,id=0矢量控制模式难以保证新能源通过MGP并网的有功传输效率,而多逆变器并联驱动MGP的仿真结果表明,所提控制策略可以保证新能源场站全工况下MGP的有功传输效率。

Aiming at the id=0 vector control of motor generator pair(MGP)driven by inverters in paral-lel,it is difficult to ensure the active power transmission efficiency of new energy connected to the grid through MGP when the MGP output is large.Combined with the characteristics of synchronous motor in u-nit power factor(UPF)state,the UPF control strategy of MGP driven by multiple inverters in parallel was proposed.The strategy ensures the active power transmission efficiency of new energy through MGP grid connection by calculating the stator d and q axis current of synchronous motor when the inverter out-put is all active power state.The negative feedback characteristic of fluxψand stator d axis current of synchronous motor was used to simplify the calculation,and the current distribution coefficient ki was used to make it suitable for full operating condition where multiple inverters have the same or different ca-pacity and the same or different output,which is consistent with the engineering practice.Both theoretical research and simulation analysis show that the id=0 vector control mode is difficult to ensure the active power transmission efficiency of new energy connected to the grid through MGP,while the simulation re-sults of MGP driven by multiple inverters in parallel show that the proposed control strategy can ensure the active power transmission efficiency of MGP under the full working conditions of the new energy station.