Control Strategy Of Cophase Traction Device Of Cophase Continuous Traction Power Supply System

Negative sequence, harmonics, reactive power, electricity sub-phase electrified, loss of train speed and traction effort problems exist in railway power supply, seriously affecting the development of high-speed and high-load railway. New type of cophase continuous traction power supply system can eliminate the negative, reactive power compensation and harmonic distortion to achieve smaller, and fundamentally solve the electrified railway power quality problems caused by the abolition of electronic phase separation aspect of adaptation electrification railway trends.Continuous traction power supply system connected with the power system is an AC-DC-AC system, mainly Constitute by three-phase rectifier, DC storage side, single-phase inverter side and coordination of parallel links among the composition. Traction goes through a three-phase AC current-DC-Single-phase of the process to take current. This process is reversible that it can be changed by the electric power generation. The core part of the whole power supply system is the DC link and the associated storage rectifier, inverter device integration and control links. This enables to isolate the power system and traction power supply system in the power quality which are relatively independent. DC link energy storage can also join other energy generation, which is appropriate for the development of increasingly powerful and decentralized network characteristics.This dissertation detailed six types of control strategy, hysteresis current control, power control, repetitive control, feedback linearization control, variable structure control, and analyzed design while testifying control strategy above for the core of this paper, cophase traction device. Finally, this project modeled continuous traction substation network, studied substation in parallel inhibition of the circulation and some approaches of current sharing, proposed parallel run-time system control strategy, and proposed control strategy of two models of inverter with parallel operation while simulating.