The invention relates to a closed-loop control method of a subway energy feedback device. The method comprises the following steps that 1) a target voltage value Udc-ref of a DC contact net is arranged manually, the voltage Udc of the DC contact net is detected in real time, and a voltage controller of the DC contact net compares the Udc-ref with the Udc to obtain deltaU; 2) three phases of voltage transformers PT1, PT2 and PT3 detect sampling electrical-network voltages Usa, Usb and Usc of three phase lines at the step-up side respectively, and the sampling electrical-network voltages Usa, Usb and Usc are calculated by a phase-locked loop PLL to obtain an electrical-network synchronization signal omegat needed by dq reverse transformation; 3) an axis-q reactive current instruction lq-ref is set according to a reactive scheduling requirement issued by a peripheral superior control system; and 4) three phases of control output Uia-ref, Uib-ref and Uic-ref are input to a three-phase scheduling module for single-pole frequency multiplication modulation to obtain three phases of pulse signals, and each phase includes 4 paths. Thus, the frequency is multiplied at the low-voltage ends of the voltage transformers, correct three-phase AC is fed to the middle-voltage AC electrical network, and the voltage of the DC contact net is stabilized.
Closed-loop control method of subway energy feedback device
2015-12-16
Patent
Electronic Resource
English
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60M Speiseleitungen oder Vorrichtungen am Gleis für elektrisch angetriebene Fahrzeuge , POWER SUPPLY LINES, OR DEVICES ALONG RAILS, FOR ELECTRICALLY-PROPELLED VEHICLES / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |
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