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At present, the SiC devices have been widely concerned with the excellent characteristics of low switching losses, which can significantly improve the frequency of power electronic converters, and also have broad application prospects in the field of rail transportation. In this paper, through the establishment of 1500V powered subway auxiliary inverter loss model, the author estimated loss and efficiency...
In this paper, two kinds of simplified cell structures for low voltage noise immunity and a hybrid Markov Random Field probabilistic-based circuit design technique are proposed to reduce the hardware overhead and improve the noise immunity. To demonstrate the proposed technique, four kinds of test chips with an 8-bit carry lookahead adder (CLA) are fabricated in a 130nm CMOS technology. Measurement...
Single-phase quasi-Z source inverter (qZSI) needs large capacitance, and its switching loss is high when controlled by traditional SPWM. In this paper, a new modulation method for single-phase qZSI is proposed, which combines SPWM and pulse-width-amplitude modulation (PWAM), as a result of hybrid modulation. SPWM is employed at low dc-link voltage to avoid shoot-through state and act switching at...
The double-line-frequency (2ω) power ripple of single-phase quasi-Z-source (qZS) Photovoltaic (PV) inverter highly affects the whole system's design and performance. In this paper, a comprehensive modeling for single-phase qZS PV inverter is proposed, where the 2ω-ripple models of qZS inverter system served by real PV source are established and discussed on cases of with and without PV terminal capacitor...
This paper proposes an energy stored quasi-Z source (qZS) cascaded multilevel inverter (ES-qZS-CMI) based photovoltaic (PV) power generation system. The system combines advantages of both the qZS inverter and the cascaded multilevel inverter; moreover, the system uses a battery in each module to balance the stochastic fluctuations of PV power injected to the grid. This paper also proposes an effective...
There are many different kinds of flue-curing barn controllers in market. However, most of them are simply LED display and buzzer alarm, which cannot show directly and are hard to manipulate. In addition, the two step speed regulation circulating ventilator is not excellent enough for the best quality of tobacco leaf curing. According to those shortcomings, we design a new bulk curing barn controller...
In this article, we present a novel gang control system in drive application for a six-phase induction motor, forcing on the properties of gang Variable Voltage Variable Frequency(VVVF) control system, which is based on integration of power drive modules and power electronic system. The design of VVVF system for six-phase induction motor is set up, the results of theoretical analysis and MATLAB simulation...
A novel topology of full-bridge isolated DC-DC converters, which is widely used in renewable energy generation and auxiliary railway supply, is presented in this paper. The proposed full-bridge isolated DC-DC converter is composed of a PWM inverter, a diode rectifier and a high frequency (HF) transformer. In this topology, the stabilization of output voltage is difficult to achieve because of high...
The main structure of each phase is composed of cascaded PWM rectifier (CPR) and cascaded inverter (CI) in three-phase high voltage converter (HVC). High voltage grid is the input of HVC. In order to ensure proper operation of HVC, the control method should achieve output voltage sharing (OVS) among rectifiers in CPR, OVS among inverters in CI and high power factor of HVC. Master-slave direct current...
This paper applies an effective repetitive controller to the Static Synchronous Compensator (STATCOM). This hybrid controller integrated repetitive control with proportional feedback control. This approach can decrease steady-state error and improve robustness. A detailed design method is presented and the mathematical model is introduced. The simulation results demonstrate the validity of the proposed...
In this paper, a control technique is proposed for parallel connected inverters to share linear and nonlinear loads in proportional to their capacities. Using locally measurable feedback voltages and currents without an external communication mechanism, this technique considerably reduces the sharing error of reactive power, output voltage drop and output voltage distortion, which are inherent drawbacks...
A control technique is developed for parallel operating inverters with no control interconnections in microgrid. This technique uses only locally measurable feedback signals to allow some independent inverters to share the active power for loads, while the others to provide reactive power compensation for loads, both in proportional to their capacities. Simulation results prove the validity of this...
In this paper, a control technique is developed for parallel inverters with no control interconnections in microgrid. The proposed control technique, based on droop control method and virtual impedance method, uses only locally measurable feedback signals to make some of the parallel inverters supply only reactive power equally for loads while the others share only active power. Simulation results...
A novel control method is presented for improving the reliability of transformerless cascade STATCOMs operating under various faults. A modified H bridge circuit is proposed, and it could be totally bypassed under various faults while the STATCOM keep working. During the fault transient, by controlling the phase of a STATCOMpsilas output voltage, the DC capacitors could be charged or discharged to...
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