The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, constrained model predictive control (MPC) based on parallel neural network optimization is proposed to apply to pulse width modulation (PWM) rectifier and improve power quality. An decoupled model of three-phase rectifier in abc coordinates is built. Then, the constrained MPC method is proposed. This method breaks the limits of predictive control with finite set and without constraints...
A muti resonant controller for high-frequency-link single-phase inverter is proposed in this paper. An equivalent circuit, which behave just like conventional unipolar PWM inverter is proposed for the converter. The dynamic model of the inverter, which built in continuous domain, is built. The inverter has the advantages of high efficiency, high power density, low-cost, low noise, bidirectional power...
This study proposes a compensation strategy to deal with both current and voltage measurement errors in the three-phase PWM rectifier system. The DC offset and scaling errors in the voltage and current measurements cause the injection of undesired DC and unbalanced currents into the three-phase input current and subsequently lead to voltage ripple at the DC output voltage. This paper proposes a compensation...
The four-quadrant converters applied to the locomotive traction have higher requirements for the power density and reliability. Compared with conventional IGBTs, RC-IGBTs have the advantages of low thermal resistance and high current density. In this paper, RC-IGBT is applied to four-quadrant converter and the working characteristics and pulse distribution of four-quadrant converter under the desaturation...
New sensorless virtual-flux (VF) based predictive direct power control (PDPC) (VF-PDPC) of a three-phase pulse-width modulation (PWM) rectifier is developed in this paper. The VF estimation is achieved through a simple neural filter based integrator (NF-I) in series with a multi-output adaptive linear neuron (MO-ADALINE). The NF-I leads to cancel dc offset and harmonic distortions in the estimated...
For the discussion about the neutral point potential (NPP) control of single phase three-level rectifiers, most of the methods solve the NPP problem by adjusting the zero-sequence voltage under symmetrical load conditions. However, when one phase voltage reaches to the maximum voltage, the other phase voltage goes to the minimal voltage. As a result, the NPP control ability is limited since there...
VIENNA rectifier with simple structure, which is widely used in charging systems for electric vehicle, realizes the operation of unit power factor and low harmonic. However, grid voltage unbalance will aggravate the dc-link voltage ripple and input current THD. A novel control scheme is presented to solve the impacts of three unbalanced grid voltage for VIENNA rectifier in this paper. The enhanced...
Power conversion equipment, such as a rectifier, uses pulse width modulation (PWM), and/or pulse frequency modulation (PFM). The International Electric Commission (IEC) published an international standard for conducted immunity tests below 150 kHz that uses a continuous wave (CW) or a CW with pulse modulation as test waves, but does not specify that the test waves should simulate features of conducted...
The aim of this paper is the design and implementation of the control algorithm of a PWM boost rectifier capable to handle bidirectional energy flow. For this goal, the boost rectifier control loops must be tuned for the proper operation of absorbing active power from the power grid and transfer it to the dc load at constant output voltage, and also to give the rectifier the ability to generate back...
This paper is focused on the performance and limits of the boost rectifiers with unity power factor, in terms of the total harmonic distortion factor of the current drawn from the power supply. Different values of the prescribed output voltage are taken into consideration. The direct current control based on the output of voltage controller is proposed. The case study of a battery charging station,...
For three-phase voltage-sourced PWM rectifier, a novel double closed loop control method was proposed in this paper, based on the mathematical model in synchronous rotating coordinate system. Considering the coupling characteristics, the current inner loop developed a practical hybrid control method, consisting of inverted decoupling and internal model control (IMC), which could realize the complete...
This paper presents a dc-link voltage control for a three-phase PWM rectifier that combines an adaptive PI controller with a feed-forward of the load current which is estimated through a Luenberger observer. A systematic design approach is presented for the adjustment of the adaptive PI and the observer gains. Several simulation and experimental results are presented and discussed in order to show...
In the direct-drive wave energy conversion(DDWEC)system, the rotor of the linear generator oscillates along the vertical direction, as a result, the active power of the DDWEC and the DC voltage obtained by PWM rectification fluctuate greatly. To deal with this issue, a new biological intelligent controller which is based on the modulation principle of testosterone release is introduced. The models...
DC power supply mode is used for high power fast charging of electric vehicles, the voltage ripple generated by rectifier of preceding stage causes overvoltage and overcurrent in the battery, which can reduce the battery life, the operation stability of post-stage DC-DC chopper is also reduced, so the quality of charging is affected. Hence it is important to restrict voltage ripple generated by rectifier...
In view of the current problems of complex structure and small capacity of the four quadrant medium voltage frequency converter, this paper puts forward the topology of the three - level, high power, and the four - quadrant medium voltage inverter based on IGCT. Based on the study of the characteristics of IGCT switch, the topology and control technology of three levels PWM rectifier are studied....
In both the traditional diode uncontrollable rectifier circuit and thyristor phased rectifier circuit, the shortcomings of low power factor are difficult to overcome. PWM rectifier circuit is to use full control power switch devices and adopts PWM control mode of rectifier circuit, through the adoption of appropriate control strategies and PWM modulation technology, PWM rectifier circuit can realize...
Conventional 12-pulse diode rectifiers have advantages such as: simplicity, high reliability, and low DC bus voltage ripple; however, they also result in some disadvantages including harmonic current and the lack of re-generation capability. Therefore, this study proposes an auxiliary converter (AXC) for 12-pulse diode rectifiers to mitigate the harmonic current and provide re-generation capability...
In view of a three-phase/level boost rectifier, the performance of VIENNA rectifier is affected by the neutral-point (NP) voltage unbalance and oscillation. A novel strategy of zero-sequence component injection to balance the neutral-point voltage and suppress oscillation for VIENNA rectifier is proposed in this paper. Based on the mathematical expressions of neutral-point voltage, a simplified carrier-based...
The VIENNA rectifiers have advantages of high efficiency as well as low output harmonics and are widely utilized in power conversion system when dc power sources are needed for supplying dc loads. VIENNA rectifiers based on three-phase/level can provide two voltage outputs with a neutral line at relatively low costs. However, total harmonic distortion (THD) of input current deteriorates seriously...
In this paper, an improved active disturbance rejection control (ADRC) strategy is proposed to solve the problem that the performance of the output side of the matrix converter (MC) is easily affected by the disturbance of the input side. According to the basic principle of the traditional ADRC, the non-linear feedback function is reconstructed, and the improved strategy is designed to solve the controller's...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.