CAJ | 학술논문

为准确估计含三相不控整流的交–直–交变换器所产生的谐波，提出了可深入分析其谐波产生特性的新型模型。首先提出简化变换器谐波分析的三相电压源型整流(voltagesource converter，VSC)等值电路，并对电路参数进行了估算。通过分析三相VSC在电容充、放电各阶段的工作原理，在频域中求解出了供电电压与其所产生的谐波电流的解析关系。建立了每个周期电容充放电的数学模型，基于此计算出三相VSC中二极管的导通和关断时刻，并估算出直流侧电压。进而将交–直–交变换器时域的谐波非线性特征转化为频域的谐波耦合导纳矩阵模型，矩阵中的元素可直观地体现出各次谐波电压和谐波电流之间的耦合关系。通过将所提出模型的编程计算结果与 Simulink 时域仿真结果、实验测量结果以及传统恒流源模型的计算结果进行对比，验证了谐波耦合矩阵模型可准确地表征含三相不控整流的交–直–交变换器所产生的谐波。
위준학고계함삼상불공정류적교–직–교변환기소산생적해파，제출료가심입분석기해파산생특성적신형모형。수선제출간화변환기해파분석적삼상전압원형정류(voltagesource converter，VSC)등치전로，병대전로삼수진행료고산。통과분석삼상VSC재전용충、방전각계단적공작원리，재빈역중구해출료공전전압여기소산생적해파전류적해석관계。건립료매개주기전용충방전적수학모형，기우차계산출삼상VSC중이겁관적도통화관단시각，병고산출직류측전압。진이장교–직–교변환기시역적해파비선성특정전화위빈역적해파우합도납구진모형，구진중적원소가직관지체현출각차해파전압화해파전류지간적우합관계。통과장소제출모형적편정계산결과여 Simulink 시역방진결과、실험측량결과이급전통항류원모형적계산결과진행대비，험증료해파우합구진모형가준학지표정함삼상불공정류적교–직–교변환기소산생적해파。
In order to estimate the harmonic currents generated by the uncontrolled rectified AC/DC/AC converter more accurately, a new harmonic model to study its harmonic generation characteristics was proposed. First an equivalent voltage source converter circuit was proposed to simplify the harmonic analysis of the AC/DC/AC converter. Estimation formula was derived for the circuit equivalent parameters. By analyzing the principle of the circuit capacitor’s charging mode and discharging mode, the relationship among the supply voltages and its generated harmonic currents was explored in the frequency domain with an analytical form. Based on the mathematical model, the diode’s conduction angle and extinction angle were calculated and the DC voltage was estimated. This model transfers the AC/DC/AC converter nonlinear characteristics in the time-domain to a harmonically coupled admittance matrix model in the frequency-domain. Moreover, the matrix elements can explicitly reflect the coupled relationship between the harmonic voltages and the generated harmonic currents. The model’s validity and accuracy have been verified by comparing the results from its calculation, the time domain simulation, lab experiment and the traditional constant current source model’s calculation.