風(fēng)力發(fā)電機(jī)外文翻譯-其他專業(yè)-在線瀏覽
2025-03-24 01:19本頁(yè)面
【正文】 ns, generator speed, and power controllers’ hysteresis bandwidth. More recently, a modified DPC strategy has been proposed in (Zhi and Xu, 2021) based on SFO vector control in the synchronous reference frame for DFIGbased wind power generation systems with a constant switching frequency. The control method directly calculates the required rotor control voltage within each switching period, based on the estimated stator flux, the active and reactive powers and their errors. The control strategy provides improved transient performance with the assumption of the stator (supply) voltage being strictly balanced. However, the operation could be deteriorated during the supply voltage unbalance and there is no report yet on DFIG DPC under unbalanced work voltage conditions. This paper investigates an improved DPC scheme for a DFIG wind power generation system under unbalanced work conditions. In the SVO dq reference frame, a mathematical DPC model of a DFIG system with balanced supply is presented, which is referred to as the conventional model in this paper. Then during work unbalance, a modified DFIG DPC model in the SVO positive dq and negative dq reference frames is developed .Based on the developed model, a system control strategy is proposed by eliminating the stator output active power oscillations under unbalanced work conditions. Finally, simulation results on a 2MW DFIG wind generation system are presented to demonstrate the correctness and feasibility of the proposed control strategy. 濱州學(xué)院本科畢業(yè)設(shè)計(jì) (外文翻譯 ) 4 SIMULATION STUDIES,Simulations of the proposed DPC strategy for a DFIGbased wind power generation system were conducted using PSCAD/EMTDC. A singlephase load at the primary side of the coupling transformer was used to generate the voltage unbalance. The nominal DC link voltage was set at 1 200 V and the switching frequencies for both converters were 2 000 Hz. The main target of the grid side converter was assigned to control the DC link voltage with the similar method used in(Song and Nam,1999。A, respectively, where refers to absorbing reactive power. Va rious power steps were applied, viz., active and reactive power references were changed from 0 to2 MW at the instant of s. CONCLUSION， This paper has proposed an analysis and an improved DPC design for a DFIGbased
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