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Dive into the research topics where Yingchao Zhang is active.

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Featured researches published by Yingchao Zhang.


IEEE Transactions on Power Electronics | 2013

Model Predictive Direct Power Control of a PWM Rectifier With Duty Cycle Optimization

Yongchang Zhang; Wei Xie; Zhengxi Li; Yingchao Zhang

This paper proposes an improved model predictive direct power control (MPDPC) for a pulse width modulation (PWM) rectifier by using a duty cycle control. The conventional MPDPC achieves good steady-state performance and quick dynamic response by selecting the best voltage vector, which minimizes the errors between the reference power and the real power. However, due to the limited number of voltage vectors in a two-level converter, the sampling frequency has to be high to achieve satisfactory performance. This paper introduces the concept of a duty cycle control in the MPDPC by allocating a fraction of control period for a nonzero voltage vector and the rest time for a zero vector. The nonzero vector is selected by evaluating the effects of each nonzero vector and its duration is obtained based on the principle of power errors minimization. Simulation and experimental results prove that, compared to the conventional MPDPC, the proposed MPDPC with duty cycle achieves further steady-state performance improvement without affecting the dynamic response at a small cost of control complexity increase.


IEEE Transactions on Power Electronics | 2014

A Novel Soft-Switching Boost Converter With Magnetically Coupled Resonant Snubber

Tianwen Zhan; Yingchao Zhang; Jintong Nie; Yongchang Zhang; Zhengming Zhao

A novel soft-switching boost converter with a magnetically coupled resonant snubber is presented in this paper. The passive snubber circuit, which is composed of two diodes, two capacitors, and one coupled inductor, ensures a zero current turn-on and zero voltage turn-off conditions for the power switch, and alleviates the reverse-recovery problem for the output diode. Moreover, with the proper design of the snubber circuit, the power switch and output diode can be softly switched in a wide load range. The operating principle and performance analysis of the proposed converter are described in detail. The experiment from a 400 W prototype has been carried out and the results show that the proposed converter has the advantages of simple structure, low complexity control, and the highest efficiency is more than 95%.


international conference on electrical machines and systems | 2013

Mechanism analysis and experimental study of table-based direct power control

Yongchang Zhang; Changqi Qu; Zhengxi Li; Yingchao Zhang

PWM rectifier controlled by direct power control (DPC) is characterized by the merits of quick response, no need of inner current tuning and strong robustness, etc. The switching table is the key point of DPC and many researches have been done in this field. However, most papers fail to give a clear interpretation on the mechanism of switching table. This paper gives a detailed analysis on the mechanism of the switching table by using mathematical derivation and geometry illustration. It is found that there are six kinds of feasible switching tables, among which three tables have been reported in the literature while other three not. The performance of the six kinds of tables are compared and their respective pros and cons are summarized. Selected simulation and laboratory experimental results are presented to confirm the feasibility of the six switching tables.


international conference on electrical machines and systems | 2013

Comparative study of model predictive current control and voltage oriented control for PWM rectifiers

Yongchang Zhang; Qin Zhang; Zhengxi Li; Yingchao Zhang

This paper presents the performance evaluation and comparisons of two different control strategies for three-phase pulse width modulation (PWM) rectifiers. The two control methods are voltage oriented control (VOC) and model based predictive current control (MPCC). VOC decomposes the grid currents into active and reactive power components and regulate them separately in synchronous frame using PI. Contrary to VOC, MPCC eliminate the use of PI for the current control. It uses a discrete-time model of the system to predict the future value of the load current for all possible voltage vectors and the one minimizing the current errors is selected. The theoretical background is described, and the advantages and disadvantages of each scheme are studied through analysis and a series of experiments. A comprehensive comparison and evaluation are implemented for the two methods from several aspects such as algorithm complexity, steady state and dynamic performances, current THD. Compared to the conventional control strategy VOC, model based predictive control (MPC) is intuitive in principle and easy to understand. Furthermore, it does not require any regulators such as PI in VOC. Simulation and experiment results prove that, MPPC can achieve similar steady state performance to VOC and the dynamic response is better.


vehicle power and propulsion conference | 2013

Three-Level PWM Rectifier Based High Efficiency Batteries Charger for EV

Yingchao Zhang; Liping Jin; Youquan Jing; Zhengming Zhao; Ting Lu

This paper describes a new type charger for electric vehicle (EV) batteries. The three-level PWM rectifier used Metal-Oxide-Semiconductor-Field-Transistor (MOSFET) with direct power control based on space vector PWM (DPC-SVM) is adopted in the front-end PWM rectifier to achieve high power factor as well as reduce system cost, and full-bridge (FB) converter with phase-shifted zero-voltage zero-current-switching (ZVZCS) is applied to the back-end DC/DC converter to improve system efficiency. Decoupling control for instantaneous active and reactive powers of the grid is realized. Experimental results in 8kW prototype show that during the whole charging process, the system efficiency is higher than 85.1% and the input power factor is higher than 99.9%.


international power electronics and motion control conference | 2009

A novel direct power control strategy with wide input voltage range for three-level PWM rectifier

Ting Lu; Zhengming Zhao; Yingchao Zhang; Liqiang Yuan

This paper focuses on a three-level pulse width modulation (PWM) rectifier using direct power control (DPC) strategy, analyzes the relationship between the input power source voltage, the output dc voltage and the switching table, and presents the key-point which limits the input voltage range of the rectifier. A novel DPC strategy with wide input voltage range for three-level PWM rectifier is proposed through optimizing the switching table and consummating the rules of vector switching. Employing the proposed strategy, the effective region of input voltage vector is enlarged, the rectifier achieves satisfying stead-state and dynamic performances with low input voltages while maintaining the constant dc output, the ride-through capability of the three-level PWM rectifier against the power source voltage sags is significantly improved, the excessive voltage jumps in phase and line-to-line voltages are avoided and the neutral-point voltage is balanced at the same time. Simulation and experimental results verify the validity and feasibility of the proposed scheme.


international conference on performance engineering | 2015

Direct power control of PWM rectifier with optimal duty ratio under unbalanced network

Yongchang Zhang; Changqi Qu; Zhengxi Li; Yingchao Zhang; Longhan Cao

Direct power control (DPC) attracted wide attention due to its advantages of simple structure, quick response, strong robustness and elimination of current regulation/PWM blocks. However, conventional table-based DPC cannot work well when grid voltage is unbalanced. This paper proposes an improved DPC by using a new definition of instantaneous reactive power. As a result, the distortion in grid current is eliminated and constant active power and new reactive power are obtained. Neither complicated calculation of power compensation nor positive/negative sequence extraction of grid voltage/current is required. The corresponding switching table suitable to regulate both active power and the new reactive power is established. Furthermore, the concept of duty cycle control is introduced to further improve the steady state performance of conventional DPC. Experimental results are presented to confirm the theoretical study and the effectiveness of the proposed method.


international conference on electrical machines and systems | 2014

Decoupled direct power control based on improved sector selection algorithm for three-level grid-connected inverter

Ting Lu; Zhengming Zhao; Yingchao Zhang; Liqiang Yuan; Fanbo He

Direct power control (DPC) is one of the most popular control strategies for grid-connected inverters due to its outstanding dynamic performance. However, the control coupling between active power and reactive power seriously depresses the steady-state performance of the conventional three-level DPC. By modifying the switching table of three-level DPC, the effect of power control coupling can be restrained, and the steady-state performance can be improved to some extent. But at the same time, the modified switching table will distinctly increase the switching frequency of the inverter because of the enlarged optional vector range, which is unacceptable to high power applications. In this paper, based on the analysis of power control coupling, a decoupled three-level DPC based on improved sector selection algorithm is proposed in order to eliminate the control coupling without increasing the switching frequency. The proposed strategy still adopts the conventional three-level switching table. Therefore, extra switching actions and high switching frequency are avoided. Experimental results verify the superiority of the proposed strategy. Compared with the conventional three-level DPC and the three-level DPC based on modified switching table, the proposed strategy achieves better steady-state performance.


energy conversion congress and exposition | 2013

Uncoupled direct power control based on improved sector selection algorithm for three-level PWM rectifier

Ting Lu; Zhengming Zhao; Liqiang Yuan; Fanbo He; Yingchao Zhang

Direct power control (DPC) is a popular control strategy with superior dynamic performances for pulse width modulation (PWM) rectifiers. However, when the conventional DPC is applied to three-level PWM rectifiers, the coupling between controls of active power and reactive power depresses the steady state performances seriously. By improving the switching table of three-level DPC, the effect of power control coupling can be eliminated to some extent. But at the same time, switching frequency of the rectifier will be distinctly increased due to the enlarged optional vector range of the improved switching table, which is unacceptable to high power applications. In this paper, based on the analyses of power control coupling and its effect, an uncoupled three-level DPC with improved sector selection algorithm is proposed in order to eliminate the control coupling without increasing the switching frequency. Experimental results verify the feasibility and the superiority of the proposed strategy.


international symposium on power electronics for distributed generation systems | 2010

Compensation of control delay and discrete control error in predictive direct power control for three-level PWM rectifier

Ting Lu; Zhengming Zhao; Fanbo He; Liqiang Yuan; Yingchao Zhang

In three-level pulse width modulation (PWM) rectifier, the performances of the conventional predictive direct power control (PDPC) method are seriously degraded by the one-control-period delay and the discrete error of control variables. This paper investigates the problem by evaluating the influences of the control delay and the discrete control error on the performances of the system, and proposes a novel three-level PDPC method with compensation of control delay and discrete control error. An instantaneous power predictor is designed to compensate the control delay. Optimized prediction and control equations are deduced considering the variations of grid voltages during one control period in order to improve the control precision. Simulation and experimental results prove that the proposed three-level PDPC strategy achieves excellent steady-state and dynamic performances.

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Yongchang Zhang

North China University of Technology

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Liping Jin

Chongqing Communication Institute

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Tianwen Zhan

Chongqing Communication Institute

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Zhengxi Li

North China University of Technology

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Wusong Wen

Chongqing Communication Institute

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Changqi Qu

North China University of Technology

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