Research On The Control Technology Of The New Type Of The Reverse Side Power Supply System

Our existing cophase traction power supply system in the face of the negative sequence, harmonics, non power and electrical phase four problems, seriously restricting the electric locomotive of heavy load and high-speed operation.In order to realize the negative sequence, harmonics, non reactive currents of active management, complete cancellation of whole network neutral link to realize co phase power supply through the whole network. The main task of this paper is to study without traction transformer through new cophase traction power supply system application in the key control problems.In electric railway traction power supply field, formed the theoretical system is cancel electrified railway power phase, take the initiative to improve electric quality and to achieve through a powerful means of the power supply can not only reduce the outage time, and can greatly improve the speed of the electric locomotive, is conducive to high-speed and heavy haul traction to achieve on electric locomotive regenerative braking energy effective use again.The inverter side current loop of high performance polycyclic composite inverter control scheduling strategy and ensure the traction network in nonlinear, frequent fluctuations in complicated conditions such as load under the condition of stable power supply, the cascade inverter unit with power balancing and fault tolerance for complex locomotive power requirements under the condition is proposed in this paper.The control strategy of the inverter output voltage instantaneous value feedback control loop regulator, rapid adjustment of the complex working conditions under traction network voltage fluctuation, of traction load in the presence of active current and non reactive current and harmonic current matched automatically, while suppressing the effect of second harmonic fluctuation of power unit of DC side voltage of the contact line voltage and improve inverter control dynamic adjustment ability;The inverter output voltage effective value outer loop control regulator and improve the low switching frequency control system center frequency bandwidth, make up the inner loop regulation is insufficient gain and achieve the sinusoidal reference signal without static error tracking, ensure the stable output voltage at inverter side.The round robin scheduling strategy is introduced into the hot backup. According to the scheduling cycle, the corresponding working units are backed up in order to ensure the effective utilization of all power units, reduce the failure rate and improve the service life;Introduction of inverter side cascaded power units of N+1 redundancy more than fault tolerance scheduling strategy, redundancy within the fault or warning, replaced by warm standby units without delay to solve system bypass fault caused by derating due to problems, effectively reduce the transient disturbance, uninterruptedly for electricity and plan of maintenance and replacement of the device.For multiple new cophase power supply device is composed of a parallel system, the analysis of the control targets, proposed a with nearby power supply and circulation active suppression ability of parallel control strategy, build completely abolished electricity phase through type new Cophase Traction Power supply system.Through decentralized control logic and interconnect, the inverter output voltage phase by the same clock phase as a reference to solve multiple phase power supply device is connected in parallel cooperative control problem, so the traction transformer cophase power supply device output voltage strictly consistent.In the long distance distributed traction power supply system, considering the line impedance can not be ignored and the load position of the locomotive can be solved, the problem of the power supply of the new type of the new type of the same phase power supply device is solved;By introducing the circulation active suppression strategies to achieve circulation power self correction, thus maximize eliminate the actual output voltage error caused by circulation system, solve the problem of circulation between different substation, realization of the whole network through traction power supply.At last, the experimental results are given, and a detailed summary and prospect are given.