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Research On Regenerative Braking Energy Feedback Inverter System Of Urban Mass Transit

Posted on:2012-10-28Degree:MasterType:Thesis
Country:ChinaCandidate:G H LuanFull Text:PDF
GTID:2212330338467183Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
At present Urban Mass Transit power supply systems are generally adopt un-controllable diode rectifier. When the locomotive brakes, the locomotive motor used as generator and produces braking energy.This part of the energy is used by some locomotives; the remains can make the DC traction network's voltage rise. The current application solution is setting the automotive or ground braking resistor to absorb the energy, but because the Urban Mass Transit stations' distance is short, so the locomotive's start and brake frequents are high, the braking energy is quite substantial.At this stage, the resistance braking is used, most of the remaining energy is consumed by the resistance, which not only results in low utilization of regenerative braking energy, but also increases the burden of cooling ventilation system.The fundamental problem which Urban Mass Transit uses regenerative braking energy is power supply system adopts uncontrollable diode rectifier; this paper introduces a regenerative braking inverter feedback system. The system exists in parallel with uncontrollable diode rectifier;Feedback system can work in two conditions:rectifier and inverter. Not only feeds back the braking energy to AC power grid; but also plays a supporting role in rectifier, share the load with the diode rectifier. Also,discusses the regenerative braking system's main inverter feedback circuit topology and introduces the work principle.Secondly,the existing type of PWM converters are compared, The feedback converter system's model is established and the main circuit parameters are designed. A control strategy which uses SVPWM modulation and bases on the synchronous rotating reference frame PI current control of voltage outer inner current loop is given.Finally, in theMatlab/Simulink environment established the simulation modesl.Analysed the process of feedback condition of the inverter, rectifier operating mode switch to the inverter operating mode and the converter work parallel with the uncontrolled rectifier.The simulation results show that the control strategy used can achieve fast and effective control, the system can feedback braking energy and stable the the network voltage, also has low harmonic content, high power factor, fast dynamic response characteristics.
Keywords/Search Tags:Urban Mass Transit, Regenerative braking, Energy feedback, mathematic model, control strategy
PDF Full Text Request
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