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The total harmonic distortion and switching stress of a three-level direct matrix converter (TLDMC) is greatly reduced in comparison with those of a conventional matrix converter (MC). Meanwhile, the TLDMC leads to major advantages in comparison with existing multi-level AC–DC–AC converter topologies in terms of reduced switch counts and lowered switching power loss. In this paper, a space vector pulse width amplitude modulation (SVPWAM) strategy for the TLDMC is proposed, which can reduce the number of switching actions and improve the voltage utilization by eliminating the zero vector of each sector. An indirect modulation model of a TLDMC is discussed according to the topology of TLDMC in this paper. For the space vector modulation of the TLDMC, the space vector pulse width modulation (SVPWM) with a zero-vector of the fictitious rectifier stage is improved to form the SVPWAM. In addition, the virtual space vector pulse width modulation (VSVPWM) strategy is used for the fictitious inverter stage. Finally, simulation and experimental results verify the correctness of the proposed method.
Peile Ye; Qiming Cheng. Space vector pulse width amplitude modulation strategy for three-level direct matrix converter. Journal of Power Electronics 2021, 21, 974 -985.
AMA StylePeile Ye, Qiming Cheng. Space vector pulse width amplitude modulation strategy for three-level direct matrix converter. Journal of Power Electronics. 2021; 21 (7):974-985.
Chicago/Turabian StylePeile Ye; Qiming Cheng. 2021. "Space vector pulse width amplitude modulation strategy for three-level direct matrix converter." Journal of Power Electronics 21, no. 7: 974-985.
In order to solve the problem of excessive damage to doubly fed induction generator (DFIG) system under the condition of unbalanced voltage, this paper presents an improved coordinated control strategy based on doubly-fed induction generator (DFIG) wind power system, which can solve these problems well. The innovation of this paper is that the parallel grid-side converter (PGSC) uses a passivity-based controller (PBC) based on the Port Control Hamiltonian Dissipation (PCHD) model. Not only can four different control goals be achieved, namely, constant voltage of DC bus voltage, grid-side active power without second harmonics, grid-side reactive power without second harmonics, and grid-side current without negative sequence component, but also to ensure that the balance of stator and rotor current without distortion, the DFIG output power and electromagnetic torque without pulsation. The proposed coordinated control strategy has the characteristics of not changing the control strategy of the rotor-side converter and avoiding complex high-order matrix. The experimental results on the software platform and the hardware platform show that the proposed coordinated control strategy has the advantages of fast response, strong anti-interference ability, high stability, less control parameters.
Qiming Cheng; Xinqiao Ma; Yinman Cheng. Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity-Based Controller Under Unbalanced Grid Voltage Conditions. Journal of Electrical Engineering & Technology 2020, 15, 2133 -2143.
AMA StyleQiming Cheng, Xinqiao Ma, Yinman Cheng. Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity-Based Controller Under Unbalanced Grid Voltage Conditions. Journal of Electrical Engineering & Technology. 2020; 15 (5):2133-2143.
Chicago/Turabian StyleQiming Cheng; Xinqiao Ma; Yinman Cheng. 2020. "Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity-Based Controller Under Unbalanced Grid Voltage Conditions." Journal of Electrical Engineering & Technology 15, no. 5: 2133-2143.
Neutral‐point ineffectively grounded power system earthed through arc suppression coil is widely used in medium‐voltage distribution system; it is called small current‐to‐ground system (SCGS) in China. When single‐phase‐to‐earth fault occurs at SCGS, the fault current is weak and the noise impairs the feature of fault current, both of which make faulty line detection difficult. Hence, this paper proposes a B‐spline bistable denoising method (BSBD) to process the transient zero‐sequence current. This proposed method consists of 2 approaches: (1) using B‐spline fitting method to improve the deficiency of bistable system and (2) the genetic algorithm used to obtain the parameters of B‐spline bistable system. Then, a faulty line detection criterion (FLDC) based on BSBD and polarity parameter is presented. Electromagnetic transients program is used for testing the BSBD and FLDC. Extensive case studies prove the effectiveness of BSBD and FLDC.
Jie Gao; Qiming Cheng; Xiaowei Wang; Mingfei Chen. Faulty line detection method based on B-spline bistable denoising for distribution network. International Transactions on Electrical Energy Systems 2018, 28, e2565 .
AMA StyleJie Gao, Qiming Cheng, Xiaowei Wang, Mingfei Chen. Faulty line detection method based on B-spline bistable denoising for distribution network. International Transactions on Electrical Energy Systems. 2018; 28 (7):e2565.
Chicago/Turabian StyleJie Gao; Qiming Cheng; Xiaowei Wang; Mingfei Chen. 2018. "Faulty line detection method based on B-spline bistable denoising for distribution network." International Transactions on Electrical Energy Systems 28, no. 7: e2565.
Passivity-Based Control (PBC) strategy, a new nonlinear method based on Euler-Lagrange (EL) model, of Split-Capacitor-type Shunt Active Power Filter (2C SAPF) is proposed in this paper. The strategy can effectively maintain the stability of the DC bus voltage and compensate for current harmonics, reactive power, unbalanced and neutral current without processing the positive and negative sequence components of all harmonics. In addition, it has a faster response and better compensating effect than conventional linear and nonlinear strategy. The proposed strategy is validated by simulations.
Yu Zhang; Qiming Cheng; Yinman Cheng; Fengren Tan; Jie Gao; Deqing Yu. Nonlinear Control Strategy of Split-Capacitor-Type Shunt Active Power Filter Based on EL Model. Lecture Notes in Electrical Engineering 2017, 43 -51.
AMA StyleYu Zhang, Qiming Cheng, Yinman Cheng, Fengren Tan, Jie Gao, Deqing Yu. Nonlinear Control Strategy of Split-Capacitor-Type Shunt Active Power Filter Based on EL Model. Lecture Notes in Electrical Engineering. 2017; ():43-51.
Chicago/Turabian StyleYu Zhang; Qiming Cheng; Yinman Cheng; Fengren Tan; Jie Gao; Deqing Yu. 2017. "Nonlinear Control Strategy of Split-Capacitor-Type Shunt Active Power Filter Based on EL Model." Lecture Notes in Electrical Engineering , no. : 43-51.
At present, the research on five-level inverters mainly involves the modulation algorithm and topology, and few articles study the five-level inverter from the control strategy. In this paper, the nonlinear passivity-based control (PBC) method is proposed for single-phase uninterruptible power supply inverters. The proposed PBC method is based on an energy shaping and damping injection idea, which is performed to regulate the energy flow of an inverter to a desired level and to assure global asymptotic stability, respectively. Furthermore, this paper presents a control algorithm based on the theory of passivity that gives an inverter in a photovoltaic system additional functions: power factor correction, harmonic currents compensation, and the ability to stabilize the system under varying injection damping. Finally, the effectiveness of the PBC method in terms of both stability and harmonic distortion is verified by the simulation and experiments under resistive and inductive loads.
Tao Li; Qiming Cheng; Weisha Sun; Lu Chen. Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model. Energies 2017, 10, 1657 .
AMA StyleTao Li, Qiming Cheng, Weisha Sun, Lu Chen. Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model. Energies. 2017; 10 (10):1657.
Chicago/Turabian StyleTao Li; Qiming Cheng; Weisha Sun; Lu Chen. 2017. "Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model." Energies 10, no. 10: 1657.
A new three-level neutral-point-clamped quasi-Z-source inverter topology is proposed. The topology can effectively reduce the Z-source network capacitor voltage stress and inhibit the start inrush current, thus low-voltage capacitors can be selected to reduce the volume and cost of the inverter. In addition, the changed structure will not affect the boost ability and all existing modulation methods can be used directly. The proposed topology is validated by simulations.
Deqing Yu; Qiming Cheng; Jie Gao; Fengren Tan; Yu Zhang. Three‐level neutral‐point‐clamped quasi‐Z‐source inverter with reduced Z‐source capacitor voltage. Electronics Letters 2017, 53, 185 -187.
AMA StyleDeqing Yu, Qiming Cheng, Jie Gao, Fengren Tan, Yu Zhang. Three‐level neutral‐point‐clamped quasi‐Z‐source inverter with reduced Z‐source capacitor voltage. Electronics Letters. 2017; 53 (3):185-187.
Chicago/Turabian StyleDeqing Yu; Qiming Cheng; Jie Gao; Fengren Tan; Yu Zhang. 2017. "Three‐level neutral‐point‐clamped quasi‐Z‐source inverter with reduced Z‐source capacitor voltage." Electronics Letters 53, no. 3: 185-187.
Since weak fault signals often lead to the misjudgment and other problems for faulty line selection in small current to ground system, this paper proposes a novel faulty line selection method based on variable scale bistable system (VSBS). Firstly, VSBS is adopted to analyze the transient zero-sequence current (TZSC) with different frequency variety scale ratio and noise intensity, and the results show that VSBS can effectively extract the variation trends of initial stage of TZSC. Secondly, TZSC is input to VSBS for calculation with Runge-Kutta equations, and the output signal is chosen as the characteristic currents. Lastly, correlation coefficients of every line characteristic current are used as the index to a novel faulty line selection criterion. A large number of simulation experiments prove that the proposed method can accurately select the faulty line and extract weak fault signals in the environment with strong noise.
Xiaowei Wang; Jie Gao; Guobing Song; Qiming Cheng; Xiangxiang Wei; Yanfang Wei. Faulty Line Selection Method for Distribution Network Based on Variable Scale Bistable System. Journal of Sensors 2016, 2016, 1 -17.
AMA StyleXiaowei Wang, Jie Gao, Guobing Song, Qiming Cheng, Xiangxiang Wei, Yanfang Wei. Faulty Line Selection Method for Distribution Network Based on Variable Scale Bistable System. Journal of Sensors. 2016; 2016 ():1-17.
Chicago/Turabian StyleXiaowei Wang; Jie Gao; Guobing Song; Qiming Cheng; Xiangxiang Wei; Yanfang Wei. 2016. "Faulty Line Selection Method for Distribution Network Based on Variable Scale Bistable System." Journal of Sensors 2016, no. : 1-17.
The control method of multi-variable coupling control based on model-free control is introduced. The theory and the design idea of the control method are discussed, the structure of control system is given, and the decoupling characteristics of the control method is analyzed. In this paper, the characteristics of ball mill pulverizing control system are analyzed, and the control method is applied and simulated to the ball mill control. The simulation results show that the control system has perfect decoupling and self-learning control performance for multi-variable, strong-coupled, time-varying ball mill pulverizing control system.
Cheng Qi-Ming; Cheng Yin-Man; Wang Ying-Fei; Wang Ming-Mei. The multi-variable control method based on model-free control and its simulation in the ball mill. 2010 Chinese Control and Decision Conference 2010, 2950 -2954.
AMA StyleCheng Qi-Ming, Cheng Yin-Man, Wang Ying-Fei, Wang Ming-Mei. The multi-variable control method based on model-free control and its simulation in the ball mill. 2010 Chinese Control and Decision Conference. 2010; ():2950-2954.
Chicago/Turabian StyleCheng Qi-Ming; Cheng Yin-Man; Wang Ying-Fei; Wang Ming-Mei. 2010. "The multi-variable control method based on model-free control and its simulation in the ball mill." 2010 Chinese Control and Decision Conference , no. : 2950-2954.
For the characteristics of the main steam temperature in thermal power station, the novel intelligent serial control system was proposed. The parallel cascade of fuzzy controller and PID controller was used in the main controller of system, the adaptive section was added in the general PD fuzzy control module, the gain adaptive Smith predictive estimator was adopted in the main loop for the sake of various different operating condition. The Matlab simulation shows that the novel serial control system compared with general PID serial control has excellent control performances, outstanding adaptability and robustness against model uncertainties and external disturbances
Qiming Cheng; Yonghao Wang. The Study on Fuzzy/PID Composite Serial Control System with Smith Preditive Estimate for Main Steam Temperature in Thermal Power Plant. 2006 6th World Congress on Intelligent Control and Automation 2006, 2, 7636 -7640.
AMA StyleQiming Cheng, Yonghao Wang. The Study on Fuzzy/PID Composite Serial Control System with Smith Preditive Estimate for Main Steam Temperature in Thermal Power Plant. 2006 6th World Congress on Intelligent Control and Automation. 2006; 2 ():7636-7640.
Chicago/Turabian StyleQiming Cheng; Yonghao Wang. 2006. "The Study on Fuzzy/PID Composite Serial Control System with Smith Preditive Estimate for Main Steam Temperature in Thermal Power Plant." 2006 6th World Congress on Intelligent Control and Automation 2, no. : 7636-7640.