PV grid connected power generation is the trend at present in the world and the grid-connected inverter is core part of PV power generation system, so high quality and low cost of inverter power supply become the focus of research. According to the characteristics of average household power, a type of...

A novel bidirectional DC-DC converter with LCC resonant net was proposed. The converter was composed of LCC resonant net and traditional bidirectional DC-DC circuit with zero voltage switching (ZVS) operation of the primary side switches and zero current switching (ZCS) operation of the rectifier diodes...

The voltage source converter based high voltage direct current transmission (VSC-HVDC) supplying passive networks is subject to voltage quality problem. In this paper, based on analyzing the influence of time delay introduced by PWM inverter and computation, a delay compensation method for vector control...

High voltage 4H-SiC Ti schottky junction barrier schottky (JBS) diode with breakdown voltage of 2000V and forward current of 2A has been fabricated. A low reverse leakage current below 1.9×10-6A/cm2 at the bias voltage of -2kV has been obtained. The forward on-state current was 2A at VF = 1.9V and 5A...

Ozone became expected as a disinfectant for agricultural soil. Since ozone has strong bactericidal activity and no residual toxicity. Therefore the ozone generation system which suitable to soil sterilizations has been developing and ozone generation properties has been studying. Our ozone reactor has...

Since the structure of electromagnetic current transformer is fully enclosed, When the fault occurs, using the traditional electrical insulation detection methods only detected whether it has defects or not. We cannot analysis the form and nature of the defects by using that detection method. In this...

In order to advance the instruction of the Smart Grid, resolve the peak regulation problem brought by new resources connected to the grid, and change the situation that hydropower peak regulationis regulated freely, analyzing the component of the hydropower peak regulation and indicating that the cost...

Phasor measurement technology developed rapidly in CHINA, Real time power system dynamic monitoring master station system were built widely in inter-regional power system and provincial power system, With WAMS system of practical ,WAMS master station test specification making is particularly important...

Pretreatment needs to be done before measuring the hydrophobicity of the composite insulators. However, the necessity of such pretreatment is questionable for operating composite insulators. Therefore, surface roughness of light pollution level, heavily pollution level, chalking and the impact of surface...

The super junction (SJ) drift is used in internal transparent collector IGBT. The influences of position of local carrier lifetime region, local carrier lifetime, and buffer layer doping level on the devices’ trade-off characteristics have been simulation studied. The results show that for given local...

The wide application of WAMS (Wide Area Measurement System) provided a new thinking for transient stability analysis of power system. Based on real-time measurement information from WAMS, a method to quickly analysis power system transient stability that does not depend on network structure, model and...

By the use of dipole theory and “point effect” theory, electromagnetic field at any point in space, initial attachment features between lightning and aircraft and electric field intensity at “sharp” and “terminal” parts were researched theoretically. Conclusion was got: “sharp” and “terminal” parts are...

This paper presents the impact of substation breaker failure operation on system transient stability and the ways to enhance post-fault transient characteristics. Power System Analysis Simulation Package (PSASP) software is used to stimulate the circuit breaker failure operation in 220KV or 500KV substations....

Large photovoltaic power generation facilities are expected to be installed in desert areas and provide electricity to rural areas through long cable transmission lines. However, ac transmission networks in such areas are usually inadequate for stable grid operation. One problem to be solved is voltage...

First this paper briefly analyzes the electric power transient signal of single phase grounding fault, and then the fault characteristics of zero sequence current and bus voltage is obtained by wavelet transformation. Finally by using genetic algorithm to optimize the original weights of back-propagation...

People began to focus on the energy efficiency of EV charging facilities with the rapid development of EV. The energy efficiency evaluation of EV charging network requires a comprehensive reflection of the entire and all aspects of the network. This paper aims to propose a method and a model of energy...

This paper proposes a coordinative optimization model based on MILP for Hydro-thermal-LNG power system. The advantage of the method is that it simultaneously solves unit commitment for hydro and LNG( liquefied natural gas) units, and solves economic dispatch for thermal units. The coordinative optimization...

The large cross-section conductors with 1000mm2 sectional area are widely applied in South Hami - Zhengzhou ± 800kV UHVDC power transmission project. The Al wires withstand relatively high tension for the large ratio of Al to steel, so the grip strength of crimping tube designed according to traditional...

Based on trajectory information for the electric power system, this paper analyzes Transient Stability Prediction and new generation transient stability control of large power system. This method, which is independent of system parameter and model, can tell the transient stability of the electric power...

After the operation of JinSu UHVDC transmission line, influence on the stability of the interconnected power grid especially in de-icing modes is studied from various sides. To cope with the DC block fault occurred in the UHVDC transmission line, the coordinated control strategy based on emergency DC...

In this paper, a convexity index is proposed to detect the stability in a Single Machine Infinite Bus (SMIB) system. Then the criterion is extended in the multi-machine power system which can be induced to an equivalent SMIB system and a supplementary criterion is proposed. Based on the instability criterion...

By deploying a variety of intelligent devices to the smart grid, the power Internet of Things could achieve safe and reliable information transmission, collaborative processing, unified services and application integration, help promote the panoramic awareness, interoperability and seamless integration...

As one of the core equipment of high-voltage direct-current (HVDC) transmission system, the health status of passive MRTB would directly threaten the secure and stable operation of power system. Aiming at correctly getting the real-time operating status of passive MRTB , a new condition assessment method...

The electronic load is used to simulate the asynchronous motor and its load, making up the shortage of classic physical simulation method. The equivalent model of asynchronous motor is discussed. Combining the equivalent circuit with the rotor equation of asynchronous motor, the asynchronous motor model...

This paper proposed a feed-forward control strategy for active power filter. The feed-forward controller and the current controller are designed based on the state-space averaging model and the voltage controller is designed based on the power model. Since the grid voltage may generate big impulsive...

Smart distribution grid is the important part of smart grid which connects the main network with users. It is directly user oriented and the center of power distribution. This article has compared the smart distribution grid with regular traditional distribution network. Crucial techniques including...

This article has summarized the developing history of distribution automation technology and analyzed existing problems that hinder its practical application. Currently the automation level of the distribution network in our country is very low reflecting as insufficient and immature functions. The research...

With grid expansion in China, many metropolitan power grids have been divided into partitions at 220kV to reduce the system short-circuit current and make the grid structure clearer. However, there are still a lot of problems with the current domestic (Chinese) grid partitioning. In contrast, urban power...