Research On The Regenerative Braking Energy Recovery System Of Urban Rail Transit Train

Under ideal situation, analyizing the 24-pulse rectifier on AC and DC side. For phase shift error will cause 12th times harmonics on the DC side, then using simulation to verify. Urban rail transit system is made up by 24-pulse rectifier, catenary and load.Then we use a simple equivalent modeling and simulation to prove that regenerative braking energy of single train generated during braking will cause catenary’s voltage to rise. In order to mantain the stability of voltage, we study the technology of regenerative braking energy feedback inverter. Using QPR controller based on capacitor current inside and gird current outside. PR controller gains infinite at the fundamental frequency, so it can eliminate the steady-state error completely,but it may cause instability. However, at the fundamental frequency gain is limited for quasi-proportional-resonant (QPR) controller. QPR controller responses faster and more stable than PI controller, it can run on unity power factor.Using two ways to calculate the capacity of PWM rectifier unit, one is based on regenerative braking characteristic curve, the other is based on stress analysis and regenerative braking characteristic curve. Then we can get the regenerative braking energy and the capacity of PWM rectifier unit. There comes the result that:the second one is more accurate. During the inverter’s work, regenerative braking energy is as large as MW. So I study how to expand the capacity of PWM rectifier unit. At first, analyzing the dynamic circumfluence of intelligent power module. Then, finding two ways to eliminate the dynamic circumfluence:add dual-independent inductors or differential mode inductors. Third, verifying two ways by using simulation.There are great differences in regenerative braking energy calcuation based on a single train and actual situation. So, we consider two factors:saving slope and run chart. Reasonable saving slope not only can reduce traction consumption, but also can reduce regenerative braking energy. After optimizing saving slope, we analyze the influence of running chart, beacuse the energy absorbed by adjacent trains is very different in different running chart.