基于非线性拟合的高压电机功率因数补偿

High-voltage motor power factor compensation based on nonlinear fitting

异步电动机无功就地补偿是一种经济、高效的功率因数补偿方法。介绍了电动机补偿的原理和目前常用的补偿容量计算方法,以某电厂型号为YKK710-4的高压一次风机为原型,对其在不同负载率情况下进行了Matlab仿真。对于高压电机在轻载或低负载率时按照额定容量补偿效果差的问题,提出了一种基于最优补偿数据的补偿容量拟合方法:根据Matlab提供的对非线性数据进行拟合的工具箱,对实验的最优数据进行了处理,拟合的补偿容量曲线和负载率曲线的结果误差小于1%;验证了在30%、50%、70%、90%四个工况下补偿容量拟合曲线,和在35%、75%负载率时的拟合曲线。实验得到的补偿结果达到了要求的94%~95%,证明了该方法可以在工程实际中对特定电机在不同负载率下给予与比较准确的补偿。

Local compensation for reactive power of asynchronous motors is an economical and efficient power factor compensation method. It introduces the principle of compensation for motors and current calculation method of compensation capacity. Taking a YKK710-4 high-voltage primary air fan of a power station as the prototype,the Matlab simulation is carried out under the condition different load factor. If high-voltage motors are in light load,the compensation of motor that is calculated according to rated capacity performs poor. It puts forward a compensation capacity fitting method based on the optimum compensation data.Based on the Matlab toolkit which provides nonlinear fitting data,the optimum experimental data are processed. The error rates of fitting curve of compensation capacity and load rate are less than 1%. The fitting curves of compensation capacity at 30%,50%,70% and 90% working load are verified. The fitting curves at 35% and 75% load rates are also verified. The compensation results obtained in the experiment reach 94% ～ 95%of the requirements,which proves that this method can give a more accurate compensation to a specific motor under different load rates in the practice.