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The number and variety of electric vehicles connected to grid continue to grow rapidly, which results in a heavy burden on grid. To solve this problem, the concept of V2G (Vehicle to Grid) that electric vehicles could act as a new power source for grid was proposed. With distributed renewable energy developing fast recent years, charging EVs is a good way to use it. The DC micro-grid program being...
This paper makes a brief introduction to the protection logic of the last circuit breaker of arrester type. Afterwards, two novel protection strategies for the last circuit breaker of arrester type are proposed aiming at solving the problem that the protection of the arrester type last circuit breaker at the inverter side of the high-end converter cannot function properly when it's out of operation...
A novel control scheme for three-phase PWM rectifier is proposed in the paper which improves variable-frequency hysteresis-current control and space vector control due to the fact that there are common shortcomings in the traditional hysteresis controlling method. Compared with traditional current hysteresis control and space-vector control methods, the improving variable-frequency hysteresis and...
Tidal current energy receives increasing interest as a green renewable energy. Power electronic load is a useful tool to test and evaluate the performance of tidal current energy generator sets. In this paper, a novel power electronic load scheme is proposed. There are four control mode, such as constant power, constant voltage, constant current and constant resistance. It is flexible and can be used...
This paper proposes a micro-grid structure of EV charging station, which combined with new energy sources and energy storage. The core bi-directional converters DC/DC and AC/DC are introduced, with their principles and control strategies detailed. Among them, a kind of current limited closed-loop control strategy is adopted to control DC/DC, while double-loop control strategy of voltage outer inductor...
Synchronous PI controller is usually used to track current in three-phase PWM rectifier with zero steady-state error which is difficult to achieve in the single-phase system. A novel proportional-resonant (PR) control scheme for single-phase PWM rectifier is proposed in the paper. Compared with traditional PI control and current hystereis control (CHC) methods, the PR control structure is simple and...
In order to control the D-FACTS effectively and maintain high efficiency of the novel D-FACTS, high precision of the compensation voltage of each DSC is required. High precision DSC control can be achieved with Proportion-Resonance controller in stationary frame or Proportion-Integration controller in DQ frame. These two controllers are designed and implemented in both MATLAB/SIMULINK and experiment...
High precision DSSC control in D-FACTS is discussed in the paper. A triple-loop control method is proposed with Proportion-Resonance AC output voltage controller aimed to gain high precision compensation voltage. In order to provide a clear control object to the DC voltage controller design, a DC voltage control idea is proposed, which transformed the DC voltage control to AC output voltage reference...
The full-bridge convertor is able to perform as the basic electrical circuit elements in its AC side with proper control. Negative inductor which is not exist in the real world is helpful to decrease the power line impedance without the possibility of resonance like the capacitor. Three different active inductor implementation methods are reviewed and compared, based on the features of the distributed...
In this paper, the physical thermal model for a typical optical switch based on VO2 thin film is built, according to which the response time parameter expression of the optical switch is obtained in theory. The expression of the response time parameter reveals key factors relevant to the switching speed of optical switch based on VO2 thin film and theoretically gives directions to improve the switching...
This paper presents a novel frequency resource for frequency resource of ICP-MS (Inductively Coupled Plasma Mass Spectrometry), which is based on DDS (Direct Digital Frequency Synthesizes) technology. It consists of micro controller, which is the controller of system, DDS chip AD9835, which communicates with the micro controller through the SPI Bus, crystal, which provides benchmark frequency, and...
Kossel-line diffraction method is an important way to measure the structure of crystals. Colloidal crystal is one of the hotspots on the condensed physics research. In order to obtain the diffraction image, a 473nm wavelength laser is used to irradiate samples, and then the Kossel-line image of sample is projected onto the translucent screen and recorded by charge coupled device (CCD) camera. Especially,...
High power IGBTs are widely used in wind power generation systems. An advanced IGBT gate driver with Dynamic Voltage Rise Control (DVRC) is used to suppress the turn-off over-voltage of the IGBT. Mass simulations are done to evaluate the performance, showing influence of the DVRC parameters, in order to select the right parameters for applications.
In this paper, an active gate control method for high power IGBTs in wind power generation system is investigated. With this method, the turn off voltage of the high power IGBTs using Trench-/Field-Stop technology can be clamped at proper level. The implementation of the control strategies is also introduced, which has been used in the practical wind power generation system. It is based on the control...
This paper describes the fast-scale bifurcation phenomenon of a voltage-mode controlled full-bridge inverter which is widely used in AC power supply applications. Main results are illustrated by exact cycle-by-cycle circuit simulations. It is shown that the fast-scale bifurcation phenomenon is a type of local instability which manifests itself as period-doubling for some intervals within the line...
In this paper, a simple and robust voltage controller with single phase BOOST-PFC converter is proposed, which can improve voltage dynamics. The conventional control of the PFC converter requires filtering voltage ripples (referring to AC component in output DC voltage) in order to reduce the total harmonic distortion (THD) in the input current. But this filtering action significantly reduces the...
A new constant-frequency hysteresis current control algorithm for PV grid-connected inverter is proposed, in which the complex plane is divided into six sectors based on line voltage space vector of electric power grid, and two-phase switches are decoupled respectively in every sector to control corresponding line currents, and the hysteresis band is modified by prediction, so that the output current...
With the development of renewable energy generation and the requirement for grid-connected distributed generation system, wind power system with full-size convertor becomes the fashion. A simple, close-loop but efficient snubberless method (AVRF) to suppress turn-off overvoltage in a 750 kW convertor using Infineon IGBT3 is showed, which makes the convertor compact and robust.
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