When large-scale wind power is connected to the power grid, the fluctuation and uncertainty in the wind power reduce the stability and accuracy of the grid's reactive voltage division results based on the electrical distance matrix and affect the grid's reactive power regulation This paper proposes a grid reactive voltage partitioning method that considers the wind power stability and accuracy in a comprehensive manner The wind power uncertainty and zoning results are characterized by the distribution of wind power forecast error intervals and changes in the zoning result nodes at different moments when the wind power is connected Regarding volatility, according to the discretization of the probability distribution of the active power output at a certain time based on the wind power prediction, a calculation interval of the wind power output under a single cross-section is formed, and multiple sequential power flow sections within a long time scale are clustered and partitioned by an agglomeration hierarchical clustering method Finally, an optimal zoning model of reactive voltage is established over a long time scale with the minimum comprehensive stability serving as the objective function A simulation analysis of the improved IEEE39 node system shows that the partition combination can effectively increase the stability and accuracy of the reactive partitioning

/pdf/reactive-voltage-partitioning-method-for-the-power-grid-with-5dmyiydfqk.pdf

Reactive Voltage Partitioning Method for the Power Grid With Comprehensive Consideration of Wind Power Fluctuation and Uncertainty

In this paper we have treated the reliability assessment problem of low and high DG penetration level of active distribution system using the Monte Carlo simulation method. The problem is formulated as a two-case program, the program of low penetration simulation and the program of high penetration simulation. The load shedding strategy and the simulation process were introduced in detail during each FMEA process. Results indicate that the integration of DG can improve the reliability of the system if the system was operated actively.

/pdf/reliability-assessment-of-active-distribution-system-using-1s88vax1rr.pdf

Reliability Assessment of Active Distribution System Using Monte Carlo Simulation Method

A single-arm Archimedean spiral antenna that can be directly fed by a 50  coaxial cable is investigated in this study. Every antenna parameter is optimized under simulation to make the antenna work in the ultra-high frequency band. The influence of dielectric materials, feed cone angle, and antenna duty ratio is also examined. Partial discharge (PD) experiments on several typical artificial insulation defects are conducted, and a single-arm Archimedean spiral antenna and a typical microstrip antenna are utilized for PD measurement. The PD characteristics of different insulation defects are also analyzed. Results show that the designed antenna is suitable for ultra-high frequency monitoring. The detection sensitivity of the single-arm spiral antenna is superior to that of the ordinary microstrip antenna. The former can be utilized in wide-band measurement fields.

/pdf/design-of-a-uhf-antenna-for-partial-discharge-detection-of-25oxa20s1s.pdf

Design of a UHF Antenna for Partial Discharge Detection of Power Equipment

According to the low power factor and low running efficiency, a dynamic reactive power compensation method of the super high-power and high-voltage motor is proposed in this paper. The following works have been done in the study: topology of the dynamic reactive power compensation device; principle of the dynamic reactive power compensation method; control system of the dynamic reactive power compensation device; implementation of the dynamic reactive power compensation method. The amount of reactive power compensation can be adjusted smoothly and dynamically in the process of the super high-power and high-voltage motor soft-starting. The research of this paper has laid a theoretical foundation for this compensator in industrial applications. The novel design is characterized by flexible parameter setting, excellent soft starting performance of the super high-power and high-voltage motor and bright prospect in application.

A Dynamic Reactive Power Compensation Method of Super High-Power and High-Voltage Motor

This paper reports a study on the cross-correlation between the electric bid price and SENSEX using Multifractal Detrended Cross-correlation Analysis (MF-DXA). MF-DXA is a very rigorous and robust technique for assessment of cross-correction between two non-linear time series. The study reveals power law cross-correlation between Market Clearing Price (MCP) and SENSEX which suggests that a change in the value of one can create a subjective change in the value of the other.

Multifractal Detrended Cross-correlation Analysis of Market Clearing Price of electricity and SENSEX in India

The utility model discloses electric power automation equipment, which comprises an information processing module. The information processing module comprises a main processor and a wireless transceiver module. The wireless transceiver module and the main processor are in communication with each other based on the wireless communication protocol. The communication of the information processing module is realized also based on the wireless communication protocol. According to the technical scheme of the utility model, the automatic synchronization and the mutual communication among automation equipment are carried out in a wireless manner, so that the data transmission, including resource sharing, downloading and the like, can be realized. Therefore, the electric power automation equipment is convenient, efficient and safe to use.

Electric power automation equipment

The invention provides an automatic forward/reverse direction IRIG-B code decoding method. According to the method, a high precision oscillator clock module provides clocks for all modules, and clock precision is improved with the time filtering compensation algorithm; the direction of an IRIG-B code is identified through an IRIG-B code direction identifying module, the IRIG-B code is then converted into a required IRIG-B code, so that a forward direction IRIG-B code is provided for an IRIG-B code punctual edge identifying module; the IRIG-B code punctual edge identifying module extracts the punctual edge of the IRIG-B code, and a timestamp is provided for an IRIG-B information code identifying module, a pulse-per-second module and a serial port message module; time information is provided for the serial port message module by the IRIG-B information code identifying module; the pulse-per-second module outputs pulse-per-second signals and can provide the pulse-per-second clock synchronization service for clock synchronization equipment; the serial port message module outputs serial port messages and can provide the serial port clock synchronization service for the clock synchronization equipment. According to the automatic forward/reverse direction IRIG-B code decoding method, output time information is high in accuracy, light in fluctuation and good in long-term stability.

Automatic forward/reverse direction IRIG-B code decoding method

The utility model discloses a rapid power supply switching device. The rapid power supply switching device comprises an analog quantity acquisition module, an input module, an operation/logic processing module and a switch quantity output module. The analog quantity acquisition module, the input module and the switch quantity output module are respectively electrically connected with the operation/logic processing module. The rapid power supply switching device can make timely and reliable judgment when a small-current earth fault occurs and start a power supply switch so as to prevent accident escalation. The continuous and reliable running of a low-voltage bus can be further guaranteed.

Rapid power supply switching device

The invention provides a method for quickly and accurately converting the temperature on the basis of quick table lookup and Newton iteration. The method includes comparing a resistance value of a temperature sensor to a standard indexing table of sensor materials to quickly find a temperature range corresponding to the resistance value in the indexing table; converting standard 'resistance-temperature' physical formulas corresponding to the sensor materials into a corresponding iterative formula by a quick Newton iterative algorithm; using one of values in the temperature range found in the first step as an initial value of the iterative formula and defining a final temperature value precision range; computing by the aid of the quick iterative algorithm to obtain a temperature value with the required precision. The method has the advantage that the temperature detected by the temperature sensor at a monitoring point can be quickly, accurately and reliably acquired.

Method for quickly and accurately converting temperature on basis of quick table lookup and Newton iteration

Disclosed in the invention is an electrical capacity measuring method for a quick power source switching apparatus. The power source switching apparatus is connected with eight paths of voltages including respective three-phase voltages of a bus I and a bus II, one path of voltage of an incoming line, and one path of voltage of incoming line II, six paths of current magnitudes including a-phase, a-phase, c-phase currents of the incoming line I as well as a-phase, b-phase, and c-phase currents of the incoming line II, and three paths of switching device signals including signals of normally-closed auxiliary contacts of a 1DL, a 2DL, and a 3DL. On the basis of hardware filtering and utilization of a conditioning circuit, the eight paths of sine-wave voltages are structured into square waves; and the square waves are connected to a CPLD to carry out eight-path frequency measurement; and rising edges and falling edges of the square waves carry out frequency measurement, so that a one-time frequency value can be updated at half of cycle. According to the invention, the provided electrical capacity measuring method is mainly suitable for power supply switching of industrial enterprises of petrifaction, metallurgy and coal and the like; frequencies of a bus voltage and an incoming line voltage can be measured precisely; real-time sampling and tracking are realized; and accuracy of measuring of an electrical capacity needed by power supply switching can be ensured.

Electrical capacity measuring method for quick power source switching apparatus

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