城市轨道交通再生制动逆变回馈装置锁相技术研究

Phase Locked Technology of Regenerative Braking Energy Inverter Device in UMT

以PWM(脉宽调制)整流器为核心的逆变回馈型吸收装置,已逐渐成为城市轨道交通车辆再生制动能量吸收装置的主流。提出的基于双同步坐标系变换的软件锁相环(DDSRF-SPLL)相比传统的单同步坐标系软件锁相环(SSRF-SPLL),更能快速有效地提取三相电压在三相不对称、三相畸变、单相或两相电压接地等情况下的电压相位、基波频率和正负序分量的大小,为逆变回馈型吸收装置提供有力的相位保障。仿真结果验证了所提方法的正确性与有效性。

Inverter feedback absorption equipment with a core of PWM （pulse width modulation） rectifier has gradually become the mainstream of regenerative braking energy absorption system in urban mass transit. In this paper, compared with the traditional SPLL based on single synchronous reference frame （SSRF SPLL）, a software phase locked loop based on double synchronous reference frame（DSRF SPLL） can quickly and effectively obtain voltage phase, fundamental frequency and magnitude of positive - sequence component and fundamental negative-sequence component under the unbalanced and distorted gird voltage, and either single-phase or two-phase earthing fault conditions. DSRF SPLL provides powerful phase guarantee for the inverter feedback absorption equipment, and the simulation results have verified the validity and effectiveness of this method.