异步发电机恒压运行时机端无功补偿功率

Terminal reactive compensation power of induction generator under constant voltage opeation

为使异步发电机带不同负载时恒压运行,通过计算确定在机端进行补偿的无功功率。令发电机稳态运行时基值频率下等值电路回路阻抗为零,确定不同运行状况下保持端电压恒定时机端等效补偿电容值。以发电机端电压恒定为约束条件,用直接搜索优化方法进行求解。算出了异步发电机带电阻性负载和电感性负载恒压运行时机端所需无功补偿功率。无功功率以及定子频率的计算结果与实验结果相互吻合,由此证明了分析方法的有效性。

Reactive compensation power to keep constant terminal voltage of an induction generator is evaluated at different loads. The steady-state equivalent circuit is the basis on which the loop impedance expression is derived. By equating loop impedance to zero, the terminal equivalent compensation capacitance of the induction generator is calculated, which determines the reactive compensation power for maintaining constant voltage. With constant terminal voltage being as the constraint condition, a direct search optimization algorithm is utilized to solve the problem that offers some advantages over the traditional iterative method. The paper gives the calculated reactive compensation power and stator frequency with respect to purely resistive load and purely inductive load under constant voltage operating condition. A good matching hetween the calculated results and the experimental results demonstrates the validity of the proposed approach.