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The main purpose of this paper is to design a pulse-width-modulated (PWM) pulse power supply to test the performance of the solenoid valve. In order to achieve this purpose, from hardwave stage, one of the main part of designing is to use a microcontroller unit (MCU) as the core in the control system cooperating with the functional generator chip MAX038 and SG3525 to output the desired PWM waveform...
Nowadays, most of the electrical railway tractions, especially the high-speed tractions are using AC-DC-AC power driving system. The best choice for the AC-DC link is four-quadrant PWM rectifier, which can provide controllable DC link voltage and better power factor for the grid. In high power drive applications, the switch frequency of the power semiconductor device cannot be very high, usually less...
By analyzing luminous process and volt-ampere characteristics of gas discharge lamp, a piecewise linear regress mathematical model is proposed. An illuminated loop-locked intelligent adjust light controller is designed by using power switching devices and SPWM variable voltage variable frequency controlling means. The above design can modify pulse and control carrier-to-noise ratio. Within a certain...
PWM rectifier technology is introduced to the main Power Circuit of the charger for aircraft battery to enhance the charging efficiency of aircraft battery and improve its long term reliability and save its life in this paper. A new strategy of DPC Based on the Space Vector Modulation (SVM) is used in PWM rectifier, Meanwhile, a fuzzy PI controller is designed in DC voltage control loop. The simulation...
Based on the mathematic model of single-phase voltage source inverter, an adaptive control method which can deal with unknown parameters and guarantee stable of the control system is systematically proposed in the paper. According to Lyapunov stability theory, an adaptive state observer is used to estimate variables adopted in the control law. Meanwhile, A 3rd order filter is used to deal with the...
The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
In this paper is presented the structure and working principle of the cascaded H-bridge multilevel converter with PWM rectifier and phase-shift transformer. Using the leak inductance as the filter reactor of the PWM rectifier can reducing the volume and cost of the converter; the phase-shift secondary side of the transformer can eliminate the current harmonics caused by the single power unit, restraining...
Modelling and simulation of closed loop controlled class D current source resonant inverter (CSRI) for ferromagnetic load is presented in this paper. The converter can operate effectively even for fluctuating source and it operates in zero-current switching mode. The switching devices are connected through a common ground and need only a single DC power supply for the gate driver circuitry. The aim...
Aiming at the problems that traditional PI control of DC capacitor voltage has Udc slow dynamic response, the period averaging dynamic model of APF including Vdc is established based on KVL. In order to have a good linearization control effect, the inverse control strategies is presented for three-phase four-leg Active Power Filter, and Aiming at the problem that the APF's dynamic model is a multi...
This paper aims at the application of a half bridge DC-DC converter as a power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) driven air conditioner. This PFC converter is fed from single-phase AC mains through diode bridge rectifier (DBR) and connected to a voltage source inverter (VSI) feeding the PMBLDCM. The proposed PFC half-bridge converter based PMBLDCM...
Power converter is the key element of the photovoltaic generation system. In order to improve the energy conversion efficiency and achieve an economic solution, hybrid cascade inverter (HCI) is employed and implemented to realize DC-AC conversion in this paper. HCI has a similar topology with conventional H-bridge cascade inverter, while the voltages of its DC buses are in a geometric sequence. In...
This paper presents analysis of time-ratio-controlled autotransformer as a mitigating device for voltage sag disturbance. Control circuit based on load RMS and voltage sag sensing circuit based on peak detection are employed. Commonly dynamic voltage restorer and STATCOM are employed for mitigation of voltage sag. The proposed system has less number of switching devices in comparison to commonly used...
The control strategy for three-phase-high-power-factor PWM rectifier is studied, and the methodology of building the small signal model of the main power circuit is proposed in this paper. High frequency model for the rectifier mentioned and the input-to-output transfer function for the system are deduced with analysis. Design principle and method of the voltage regulator are given based on the model...
In the double closed loops control strategy of three-phase voltage source PWM rectifier in the synchronous reference frame, the linear PI control is usually adopted in the voltage control loop, which cannot reflect the nonlinear nature of the PWM rectifier, and restricts the systempsilas control performance. According to the analyses on the voltage equation of the PWM rectifier, a voltage control...
In this paper, the different influences of three-limb and multi-limb transformer with Star-Star or Delta-Star connection, three-limb filter inductor, multi-limb filter inductor and position of the LC filter in a three-phase PWM inverter have been analyzed in detail in stationary dq0 frame. The analysis show that three-phase transformer with different limb numbers and connection types have different...
This paper presents a new predictive direct power control (DPC) strategy for three-phase grid connected voltage source converters with constant switching frequency. Source and converter flux are introduced to develop the power flow model of such system. Based on the predictive power model, the output converter voltage vector in each PWM period can be calculated directly. The detailed power variations...
The current source back-to-back converters have been largely neglected because of the slow transient response and low power factor, which is mainly resulted from a fixed PWM pattern and a poor control method. However, current source converters have intrinsic advantages such as the high reliability and the inherent current limiting capability. Due to these advantages, more and more people have been...
The current state feedback decoupled control strategy in the synchronous reference frame is generally used for the three-phase voltage-source PWM rectifier, which lies in the precise inductance measurement value. In this paper, the effect of the systempsilas performance with the varying of the inductance measurement error and the synchronous frequency is investigated, and the current error feed-forward...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
For the sake of energy saving, harmonic current suppression and drive performance improvement, inverter-fed air-conditioner drive systems are used more and more extensively, and the selected motors include ASM,BLDCM and PMSM. Generally, the front stage AC/DC converter of inverter aircon is complete active power factor corrector (PFC), which can bring about better correction effects. Whereas the traditional...
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