An analytic electromagnetic calculation method for doubly fed induction generator(DFIG) in wind turbine system was presented. Based on the operation principles, steady state equivalent circuit and basic equations of D...An analytic electromagnetic calculation method for doubly fed induction generator(DFIG) in wind turbine system was presented. Based on the operation principles, steady state equivalent circuit and basic equations of DFIG, the modeling for electromagnetic calculation of DFIG was proposed. The electromagnetic calculation of DFIG was divided into three steps: the magnetic flux calculation, parameters derivation and performance checks. For each step, the detailed numeric calculation formulas were all derived. Combining the calculation formulas, the whole electromagnetic calculation procedure was established, which consisted of three iterative calculation loops, including magnetic saturation coefficient, electromotive force and total output power. All of the electromagnetic and performance data of DIFG can be calculated conveniently by the established calculation procedure, which can be used to evaluate the new designed machine. A 1.5 MW DFIG designed by the proposed procedure was built, for which the whole type tests including no-load test, load test and temperature rising test were carried out. The test results have shown that the DFIG satisfies technical requirements and the test data fit well with the calculation results which prove the correctness of the presented calculation method.展开更多
随着风电渗透率不断升高,世界各国的并网导则要求双馈风电机组具备高电压穿越(high voltage ride-through,HVRT)能力。采用传统HVRT控制策略,HVRT期间双馈风电机组可能发生超速脱网。针对该问题,根据我国国标要求,首先,基于双馈异步发电...随着风电渗透率不断升高,世界各国的并网导则要求双馈风电机组具备高电压穿越(high voltage ride-through,HVRT)能力。采用传统HVRT控制策略,HVRT期间双馈风电机组可能发生超速脱网。针对该问题,根据我国国标要求,首先,基于双馈异步发电机(doubly-fed induction generator,DFIG)的转子运动方程,推导了不发生超速脱网的DFIG定子有功功率参考值最小值的近似计算公式。其次,根据DFIG功率约束条件,阐明了HVRT期间传统控制策略下机组发生超速脱网的机理,导出了传统控制策略下机组发生超速脱网的机端电压骤升区间。在此基础上,以兼顾抑制超速脱网和无功支撑为目标,提出了有功优先结合网侧变流器(grid-side converter,GSC)的HVRT控制策略。基于PSCAD/EMTDC仿真软件,分别搭建了单台双馈风电机组和双馈风电场的HVRT仿真模型,对所提控制策略和传统控制策略进行了仿真对比分析,仿真结果验证了所提控制策略的有效性。展开更多
针对双馈风机经串补并网引发的次同步控制相互作用(sub-synchronous control interaction,SSCI)问题,提出一种有源电力滤波器(active power filter,APF)谐波补偿控制策略。基于双馈风机(doubly fed induction generator,DFIG)和串补输...针对双馈风机经串补并网引发的次同步控制相互作用(sub-synchronous control interaction,SSCI)问题,提出一种有源电力滤波器(active power filter,APF)谐波补偿控制策略。基于双馈风机(doubly fed induction generator,DFIG)和串补输电线路的等效阻抗电路,利用阻抗法分析了系统发生SSCI的原因和特性;设计有源电力滤波器,通过向有源电力滤波器内部控制器注入包含无功电流和振荡电流在内的谐波参考电流来抑制风电场的次同步控制相互作用,该谐波电流参考值可通过并网采样电流减去其有功电流获得,有功电流则通过对APF直流侧电压采用一阶自抗扰控制(active disturbance rejection control,ADRC)获得;仿真验证了所提APF补偿控制策略在抑制SSCI方面的可行性。展开更多
基金Project(2011DFA62240) supported by the International Scientific and Technological Cooperation Projects,ChinaProject(019945-SES6) supported by the European Union(EU)6th Framework Program UP-WIND Project,Denmark
文摘An analytic electromagnetic calculation method for doubly fed induction generator(DFIG) in wind turbine system was presented. Based on the operation principles, steady state equivalent circuit and basic equations of DFIG, the modeling for electromagnetic calculation of DFIG was proposed. The electromagnetic calculation of DFIG was divided into three steps: the magnetic flux calculation, parameters derivation and performance checks. For each step, the detailed numeric calculation formulas were all derived. Combining the calculation formulas, the whole electromagnetic calculation procedure was established, which consisted of three iterative calculation loops, including magnetic saturation coefficient, electromotive force and total output power. All of the electromagnetic and performance data of DIFG can be calculated conveniently by the established calculation procedure, which can be used to evaluate the new designed machine. A 1.5 MW DFIG designed by the proposed procedure was built, for which the whole type tests including no-load test, load test and temperature rising test were carried out. The test results have shown that the DFIG satisfies technical requirements and the test data fit well with the calculation results which prove the correctness of the presented calculation method.
