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Microgrid, as a new effective way for large scale new energy and renewable energy power generation systems connected to the grid, injects new vigor into the power system. Focusing on the characteristics of P-f (active power versus frequency) droop and Q-V (reactive power versus voltage) droop, on the basis of analyzing the variable slope coefficient of droop characteristic, a droop control method...
A novel PV power inverter applied in micro-grid is developed in this paper. It runs not only in connected-grid but also in disconnected-grid and keeps voltage stable rapidly in transient process. When the inverter is connected with the grid, the inverter produces power as a current-source with voltage-current close loop control strategy. Once the islanding event takes place, it runs as a voltage-source,...
When it is in the wet season and the load is low, reactive power surplus and voltage rise are caused by high-efficiency power generation of small hydropower and load reduction in Linjiang region, Baishan city, JiLin province. These problems, which exist in the power grid, are systematically analyzed in this paper. The solution measures are proposed including generator in leading power factor on operation,...
In this paper, according to the characteristic of AC-excited variable speed constant frequency wind turbine generation, stator voltage orientation vector control strategy is adopted in double-fed induction generator (DFIG). Firstly, the paper studies the running characters of DFIG, and the principle of DFIG under no-load cutting-in condition. Then according to the mathematical model of DFIG under...
Distributed generation (DG) injects new vigor into the power system, but it sometimes brings unfavorable factors influencing the power quality of distribution network. In this paper, the Dynamic Voltage Restorer (DVR) is introduced to the distribution network to improve the power quality. In view of that the detection of voltage compensation is the key factor that influences the effect of voltage...
The paper analyzed the characteristics of superfluous mud and brick rubbish transport management, presented the structure and key technologies of building the superfluous Mud and brick rubbish transport management system. It integrated GIS, Video Surveillance and network technology, implemented the goals of the automatic and dynamic management for superfluous mud and brick rubbish transport.
A single driving module with field color sequential (FCS) LCD technology needs to dynamically switch output voltage between 40 V for 12 series G- and B- color LEDs and 26 V for 12 series R-color LEDs at related time cluster. Thus, an energy-recycling (ER) technology is proposed to accelerate voltage settling and save compressed energy when the driving voltage is pressed from 40 V to 26 V. Only one...
A new control technique, peak inductor current and differential-mode voltage control technique, for non-isolated single-inductor multiple-output (SIMO) buck converters is investigated in this paper. The proposed control method can realize independent control of different output of the SIMO converters operating in continuous conduction mode (CCM) to reduce cross-regulation effect. By taking a three...
Digital peak current (DPC) controlled switching dc-dc converters operating in discontinuous conduction mode (DCM) with four different digital pulse-width modulations are studied in this paper. The control laws by using four modulation methods are derived and compared with buck converter as an example. Their stabilities are also analyzed. Experiment studies are performed to compare the transient performance...
This paper investigates a new control technique for non-isolated single-inductor dual-output (SIDO) buck converters using peak inductor current and differential-mode voltage. The proposed control method applied for SIDO converters operating in continuous conduction mode (CCM) realizes independent control of each output of the SIDO converter to reduce the cross-regulation problem. Simulation results...
In order to improve dynamic performance to load variation of PFC circuit, a digital PFC algorithm with fast dynamic response is proposed in bridgeless boost PFC. The proposed algorithm improves dynamic response by increasing voltage loop bandwidth, and uses vector rotation scheme to generate compensating harmonic signal which counteracts second order harmonic resulted from increased voltage loop bandwidth...
This paper introduces a design of high voltage pulse power supply that uses storage battery as prime power resource. This high voltage pulse power supply system can work without alternating current power supply and can be controlled by the remote control centre. Besides, some important information can be gained and displayed on the computer, such as the position, status, measured feedback of output...
This paper analyzed the neutral-point balancing problem of the neutral-point-clamped (NPC) three-level space voltage vector pulse-width modulation (SVPWM) inverter and the influence of each vector to the neutral-point voltage. Based on the normal control strategies to solve the neutral-point balancing problem, including the open-circuit passive control strategy, the hysteresis-band control strategy,...
This paper presents a design of pulse-width modulated (PWM) controller module in a MCU based on MCS-51 structure. The design can generate 2-channel programmable periodic PWM signals. These output PWM signals from MCU can be used for a variety of applications including motor control. The function of the design allows users to select independent or complementary inversion timing relationships between...
Hybrid power control system (HPCS) can be considered a newly established branch in the research of power system. The concept, theory framework and cases of HPCS are introduced in the paper. In particular, the hybrid automatic voltage control (HAVC) illustrated in the paper has successfully optimized the quality, stability and operational cost of the power system. The discrete events are taken as the...
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