Title :
Direct Power Control of Grid Connected Voltage Source Converters
Author :
Xu, Lie ; Zhi, Dawei ; Yao, Liangzhong
Author_Institution :
Sch. of Electron., Queen´´s Univ. of Belfast, Belfast
Abstract :
This paper proposes a new direct power control (DPC) strategy for grid connected voltage source converters (VSC). Similar to an electrical machine, source and converter flux are defined as the integration of the source and converter voltage respectively. Based on the defined flux, the proposed DPC scheme directly calculates the required converter voltage to eliminate the active and reactive power errors within each fixed time period. Thus, no extra power or current control loops are required, thereby simplifying the system design and improving transient performance. Constant converter switching frequency is achieved using space vector modulation which eases the design of the power converter and the AC harmonic filter. Simulation results for a 2 MW VSC system are provided to demonstrate the effectiveness and robustness of the proposed control strategy during variations of active and reactive power and AC voltage dip.
Keywords :
power conversion harmonics; power grids; power harmonic filters; reactive power control; switching convertors; AC harmonic filter; DPC scheme; VSC; direct power control; grid connected voltage source converter; power converter; space vector modulation; switching frequency; Current control; Harmonic filters; Power control; Power conversion; Reactive power; Reactive power control; Robust control; Switching converters; Switching frequency; Voltage control; Constant switching frequency; VSC; direct power control;
Conference_Titel :
Power Engineering Society General Meeting, 2007. IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
1-4244-1296-X
Electronic_ISBN :
1932-5517
DOI :
10.1109/PES.2007.385753