论文部分内容阅读
针对煤矿电网无功补偿技术方面的难点,即传统的p-q电流检测法应用于三相不平衡电网以及电网电压畸变时存在的误差,提出一种新型的电流检测方法。该检测法通过在电网后面接入一个正序电压检波器检测输出三相对称正序电压来代替实际电网中的三相电压。此种方法能够精确地确定正序电压V′的相角和频率从而能够实现基波正序电流无功分量的精确检测,达到STATCOM对负载端电流谐波和无功并补的功能。
Aiming at the difficulty of reactive power compensation technology in coal mine power grid, a new type of current detection method is proposed based on the traditional p-q current detection method applied to three-phase unbalanced power grid and grid voltage distortion. This method replaces the three-phase voltage in the actual power grid by connecting a positive sequence voltage detector behind the power grid to detect and output the three-phase positive sequence voltage. This method can accurately determine the phase angle and frequency of the positive sequence voltage V ’so as to achieve the accurate detection of the reactive component of the positive sequence positive current and achieve the function of STATCOM on the load current harmonics and reactive power compensation.