多相整流感應(yīng)發(fā)電機(jī)系統(tǒng)的研究(編輯修改稿)
2025-07-19 09:01 本頁面
【文章內(nèi)容簡介】 he parameter transformation of the 12phase power winding, and the calculation approach of the no load selfexcited voltage building is proposed. The validity of the method is verified by the agreement between the experimental results and calculated results.There are some special phenomena in the research process of theoretic machine as follows: If the parameters of 12phase winding are not designed reasonably, instead of normal fundamental resonance, the 5th or 7th harmonic resonance occurs at no load. Additionally, if the total harmonic distortion (THD) of output current waveform arrives at a certain level when SAVR regulates output DC voltage at no load, the DC voltage waveform will change from the normal 24 ripples to 6 ripples, which lower power quality heavily and can not satisfy the system requirement. The ripple ratio is much heavier at light load than at heavy load, which decreases with the increasing of the load. As the theoretical analysis and solution method to the special phenomena are critical factors to the success of novel generator scheme, it is necessary to begin with research from singlephase winding magnetic motive force (MMF) analysis, expand to the multiphase winding and reveal it. Based on the stator winding MMF analysis, the coupling electromagnetic relationship between two stator windings of the DSWIG is thoroughly uncovered as follows: The sameorder spatial harmonic field induced by the loworder harmonic currents is one of the most important causes to induce loworder harmonic resonance. The harmonic field induced by the loworder harmonic currents of the stator winding with fewer phases can result in the asymmetric operation of the winding with more phases. With these analyses, the simplified equivalent circuit of 12/3phase DSWIG is obtained by transforming the 12phase winding into one 3phase Y winding and converting the pensation winding to the other 3phase equivalent circuit. The intrinsic relationship between DSWIG and 3phase machine is revealed and the method is validated by paring calculated results with experimental results. The method is suitable for conventional M/3phase DSWIG system. (Publication: Analysis on the harmonic asymmetry of 12/3phase double winding induction generator, Proceedings of the Chinese Society of Electrical Engineering, 2004, EI: 04308283246)(3) Electromagnetic (EM) fieldcircuit coupled simulation of DSWIG systemIn large power DSWIG, a pound rotor posed of solid iron core and squirrelcage winding is adopted to meet the requirements of high speed rotation and electromagnetic performance. The structure induces much trouble on the EM design. In order to avoid the plex parameter calculation, especially for the solid iron squirrelcage rotor parameters, the two dimensional transient EM fieldcircuit coupled model of DSWIG system is established in this dissertation. An incidence transformation matrix is used to represent the connections of the external circuit. The simplified equivalent model of SAVR is achieved. A new method based on fundamental equivalent principle is put forward to deal with the skewslot effect. With this model, the effects of toothslot and nonlinearity on magnetic circuit and so on are accounted for. The calculated results consistent with the measured results very well, thus showing the model can be used for engineering applications. (Publication: Steadystate performance of dual statorwinding induction generator based on twodimensional timestepped finite element analysis. IEEEIEMDC 2007 Conference, ISTP:0248118800057)(4) Optimal design of selfexcited capacitorAs for the conventional induction generator, the disadvantages such as low PF and efficiency limit their widespread application. Ins
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號(hào)-1