移动电站直流并联功率分配研究

在分析了交流电源直接并联存在的不足的基础上，提出了采用三相PWM整流—并联—PWM逆变的供电模式。三相PWM整流器输出的直流电压含有谐波导致直流电压不断脉动，交流电源通过三相PWM整流器进行直流并联时，必须考虑电压脉动的影响。针对此问题，通过在整流器输出侧添加电阻的方式，抑制了电压脉动对并联稳定的影响；分析了并联模块接入时机对并联过程的影响；提出了一种实现并联条件下，单个模块输出功率自由分配的控制方式。最后，通过仿真验证了该控制方式的可行性。

Research on the power distribution of the mobile power station DC parallel system

Based on the analysis of the direct current power supply mode with deficiency ,a power supply mode of three phase PWM rectifier parallel PWM inverter is proposed. The DC voltage of three phase PWM rectifier contains harmonics that cause the DC side voltage ripple changing constantly. When the AC power supply is connected in parallel with three phase PWM rectifier, the effect of voltage fluctuation must be considered. To solve this problem by increasing the resistance on the rectifier output side to inhibit the voltage ripple effects on the stability of parallel system .And the influence of parallel module accessing time on the parallel process is analyzed. This paper proposes a control method which can realize the free distribution of a single module output power. Finally, the feasibility of the control method is verified by simulation.