Average value modeling of six‐pulse diode rectifier considering unbalance conditions in supply voltage and impedance

Abstract

Summary Diode rectifiers are widely used in many applications, and therefore, there is a need for an accurate model to study the rectifiers. Because of the complexity and time consuming of the analytical model of rectifiers, the average value modeling has been introduced. This paper proposes a novel average value model (AVM) for the line‐commutated rectifier bridge supplied with an unbalanced power source. The unbalance condition, here, refers to the asymmetry of the three‐phase voltage magnitude and the three‐phase impedance, which is possible due to the occurrence of asymmetry in the sources with winding such as power sources, generators, and transformers. According to the three‐phase input current of the rectifier, one cycle is divided into some intervals, and the differential equation for each interval is provided. Then, utilizing these equations, the average value of the derivative of the load current is derived from which the average value of the load current and voltage can be calculated. The proposed AVM is then verified using simulation and experimental results for the diode rectifier bridge with the load of the brushless synchronous generator field winding. Besides, the model is investigated for different load and supply parameters.

Design feedback controller of six pulse three phase rectifier based on differential evolution algorithm

“…The mathematical representation of line to line voltage can be described using ( 4)-( 6) [16]. Furthermore, the average voltage output and the root-mean-square (rms) output voltage are described using ( 7) and ( 8) [17]. Moreover, the schematic diagram of six pulse rectifier with PID controller is illustrated in Figure 1.…”

Kontrolsüz Bir Redresörle Beslenen Üç Fazlı Bir Güç Kablosunda Amper Kapasitesinin Azalması ve Güç Kablosu Güç Kaybının Alt Değerinin Bulunması

“…A rectifier model for active loads is given in [19]. Averaging can also be used to model uncontrolled rectifiers [20]. A matrix solution for their modeling is presented in the frequency domain in [21].…”

“…An equivalent circuit for a diode bridge that makes use of AC and DC side rectifier harmonics is given in [22]. The uncontrolled rectifiers draw non-sinusoidal currents and their current profile varies by the load power [16][17][18][19][20][21][22] and this can cause overheating in the power cables. In this study, a lower bound for the power loss of a three-phase power cable feeding a three-phase uncontrolled rectifier is given to find out whether the loss stays the same for the same amount of transferred power to the load and whether the loss stays within the standards such as the international electrotechnical commission IEC 60287 standard [12].…”