705results about How to "Improve the quality of power supply" patented technology

The invention provides a distribution network automatic system based on broadband wireless communication and a realization method thereof. The distribution network automatic system comprises a distribution transformer data collecting and monitoring device, a broadband wireless communication network and a monitoring center, wherein the distribution transformer data collecting and monitoring device is arranged in a transformer site for collecting and processing electric power parameters, transmitting data to the monitoring center by the broadband wireless communication network so as to responds to a control command sent by the monitoring center. In the realization method, the distribution transformer data collecting and monitoring device is connected with the monitoring center by the wireless communication network, a protocol in coincidence with electric power 101 protocol for the data transmission is set; and the distribution transform data collecting and monitoring device collects and processes the existing distribution transform parameters of the distribution transformer and responds to the control command from the monitoring center. The invention adopts a modular system architecture design, has upward and downward compatibility, and can realize various wireless broadband module communication services; in addition, the design of stipulations of an agreement of the monitoring center is based on the electric power 101 protocol and is compatible with protocols realizing different versions.

The invention relates to an area intelligent power distribution network system. Based on a management platform with a main station, a feed line, a power distribution network and centralized checking in one body, data in an area is centralized in a low voltage distribution information system for processing. The low voltage distribution information system is background application software with distribution monitoring metering, low voltage reactive compensation, a user electric quantity centralized checking system, a load control management system, and harmonic wave monitoring analysis in one body, and automation of acquisition and management of low voltage distribution network data is realized. According to the system, intelligent safety monitoring is carried out on a 10 kV distribution line and a distribution terminal device, simultaneously accurate and scientific intelligent monitoring is carried out on a 400 V distribution line, an operation status of distribution transform is grasped and reasonable management is carried out according to a requirement, by utilizing information positioning and navigation of the power distribution network, timely reaction can be carried out on an equipment line or fault, the fault is isolated automatically, distribution recovery is rapid, power supply quality is improved, and intelligent automatic management and control of an area intelligent power distribution network are realized.

The invention relates to an optical storage alternating current and direct current hybrid micro-grid system and a control method of the system. The system and the method are characterized in that a hybrid micro-grid comprises an alternating current micro-grid subsystem, a direct current micro-grid subsystem and a power exchange control system; the alternating current micro-grid subsystem comprises an alternating current side photovoltaic power generation unit, an alternating current load and a grid-connected interface; the direct current micro-grid subsystem comprises a direct current side photovoltaic power generation unit, a storage battery energy storage unit and a high/low voltage direct current load; the power exchange control system comprises a two-way AC/DC power converter, a transformer, a micro-grid controller and a communication system, the storage battery energy storage unit is used for controlling direct current bus voltages, and P/Q control is adopted in the two-way AC/DC power converter. Under the stabilizing effect of direct current side energy storage, the direct current micro-grid subsystem conducts photovoltaic power generation and is connected to a large power grid through the alternating current micro-grid subsystem at constant power, and the photovoltaic utilization rate is increased. By means of the control method, the power supply reliability and economical efficiency of the hybrid micro-grid are effectively improved.

The invention relates to a method and device for performing on-load scheduling on a single-phase load in the intelligent power grid field. A master controller is mounted at an input end of a three-phase wire, a secondary controller is mounted at each single-phase branch of the wire, and the master controller exchanges information with the secondary controllers through communication interfaces. When the wire power unbalanced degree is over limit, the master controller optimizes and formulates a control scheme to operate the secondary controllers to convert the single-phase load between the phases; in the conversion process, the load is free from instant power off, and the power grid is free from impact and interference; and therefore, the distribution circuit dynamically runs in a load balance state, the unbalanced consumption problem of the circuit is completely solved.

The utility model discloses a present city power network comprehensive evaluation system based on analytical hierarchy process and Delphi method. The system classifies and layers the characters of the city power network and then forms an integrated system including a plurality of layers according to the relationships and the differences between the characters of the city power network. The endmost character of the system is first evaluated, and then calculation is performed one layer after another according to definite calculation methods, finally a comprehensive and integrated evaluation of the city power network is obtained. The higher the comprehensive score, the better the whole situation of the city power network; namely, the construction technology rationality, the operation safety, the power supply quality and the operation economy of the power network all reach to a high level.

The invention discloses a networking method for a micro grid. The method is characterized in that: an AC generation source is connected with a DC bus through an AC/DC converter; a DC generation source is connected with the DC bus through a DC/DC converter; the DC bus is connected with a large power grid through a grid-connected inverter; the DC bus is connected with a power accumulator; and the AC/DC converter, the DC/DC converter and the grid-connected inverter are controlled by a system controller. The micro grid of the invention can be connected with a plurality of generation sources with different power generation properties and promote the development of micro grids. A networking structure of the DC bus can reduce the control difficulty of the micro grid and improve the power supply quality of the micro grid. The networking structure of the DC bus has a great advantage in connection of the micro grid to the large power grid and can adjust the grid-connection output active power and inactive power of the micro grid through the grid-connected inverter during grid connection in favor of the large power grid.

The invention discloses an on-line positioning method of a section with low-current ground faults and a system based on the positioning method. The method and the system are suitable for a neutral ungrounded power grid of 3-60kV. Under the operation condition of a line with single-phase ground faults, the phasor information of a zero-sequence voltage and the amplitude and phasor information of a zero-sequence current of the line are measured, and the section position of a fault point is determined according to the amplitude and phase information. The accuracy and rapidity of positioning are fully ensured, and the on-line positioning problem of single-phase ground faults of the neutral ineffectively grounded power grid and the monitoring problem of short-circuit faults between lines are effectively solved.

The invention discloses a single-stage boosting/reducing energy storage type photovoltaic grid-connected power generation control system, which comprises an energy storage type power conversion main circuit and a control system which are connected mutually. The energy storage type power conversion main circuit comprises a photovoltaic cell, an inductance and capacitance circuit network, an energystorage cell and a three-phase inverter which are connected mutually; and the control system is used for performing charging and discharging management on the energy storage cell, maximum power tracking and threshold control on the photovoltaic cell and closed-loop control on output active and reactive power of the three-phase inverter. The system finishes boosting/reducing, inversion and energy storage through single-stage power conversion, realizes the minimum inverter capacity with a simple structure, ensures the steady power of the power grid, can collect solar energy to the greatest degree, improves the power generation efficiency, realizes reactive compensation, electric peak regulation control and the like, and improves the quality of the power grid.

This invention relates to a load capacitance and voltage regulation switch characterizing in the following structure: a voltage-regulation static contactor is mounted on an insulated drum of a load capacitance-regulation part, a voltage -regulating bracket is set in the drum, a voltage-regulation dynamic contactor and a transition resistor are set on the bracket to integrate the load capacitance and voltage regulation, a set of operation unit is used between the quick unit of the capacitance and the voltage regulation parts by an electromagnetic clutch and an electric control box is set for adjusting capacitance and voltage automatically according to the change of loading current and voltage of a transformer.

The invention relates to a network message monitoring and fault recording integrated device for an intelligent transformer substation. The device comprises a signal access unit, a signal processing and analyzing unit and an information output unit, wherein the signal access unit is used for receiving comprehensive signals, which contain a primary system signal and a secondary system signal of the intelligent transformer substation and transmitting the comprehensive signals to the signal processing and analyzing unit; the signal processing and analyzing unit is used for analyzing the comprehensive signals of the intelligent transformer substation; and the information output unit is used for outputting the alarm signal-containing comprehensive signal analyzing result after the analysis of the comprehensive signals. The device comprehensively analyzes the comprehensive signals, which contain the primary system signal and the secondary system signal, brings great convenience to operation, maintenance, modulation and breakdown maintenance, shortens the troubleshooting time, improves the power supply quality of the intelligent transformer substation, saves the space occupied by the traditional equipment and saves investment.

The invention discloses a power load balancing system applied to a low-voltage power distribution network. The device includes phase conversion devices and a control master station; three-phase input ends of the phase conversion devices are electrically connected with the low-voltage power distribution network; single-phase output ends of the phase conversion devices are electrically connected with electricity consumption terminals, so that the load information of the electricity consumption terminals can be transmitted to the control master station; the control master station performs computation processing, and determines electricity consumption terminals which are on phases with large total load information and require phase switching, and phase switching signals which enable the electricity consumption terminals to switch to phases with small total load information from the current phases, and transmits the phase switching signals to corresponding phase conversion devices; and the phase conversion devices switch the electricity consumption terminals and make the same connected into connection phases of the low-voltage power distribution network according to the phase switching signals, so that the load of the electricity consumption terminals can be re-distributed, and therefore, the load of the electricity consumption terminals can be uniformly distributed on the three phases of the low-voltage power distribution network. With the power load balancing system applied to the low-voltage power distribution network of the invention adopted, the distribution of the load of the electricity consumption terminals between three phases can be adjusted with continuous power supply ensured, and the three-phase load balance of the low-voltage power distribution network can be realized, and line loss can be effectively reduced, and power supply quality can be improved.

The invention relates to an earth leakage protection device, in particular to an intelligentized earth leakage protection device. The earth leakage protection device provided by the invention is integrated with the functions of overload, short circuit, default phase, over voltage, under voltage, electric leakage, electric shock, automatic overlap and the like, can conveniently control a multi-path earth leakage protection switch system, display load voltage, load current, leakage current and other parameters of a low-voltage alternating current net, can display current working condition of the earth leakage protection device, historical working condition of an earth leakage protection switch and other functions, has a friendly human-machine interface, can simultaneously distinguish leakage current and shock current to reduce inessential tripping of the earth leakage protection device caused by an electric circuit and equipment leakage, and can improve security of the earth leakage protection device.

The invention discloses a STATCOM (static synchronous compensator) control system adopting a droop control strategy and a control method thereof. The STATCOM control system adopting the droop control strategy comprises a direct-current side capacitor, a three-phase inverter bridge and an inductance-capacitance filter, wherein the direct-current side capacitor and the three-phase inverter bridge are connected in parallel and then connected with the inductance-capacitance filter, and the inductance-capacitance filter is connected to a PCC (Point of Common Coupling) of a power grid by a three-phase switch K through a coupling transformer T. The control method disclosed by the invention comprises the steps of real-time signal collection, computation of active power reference value P*, computation of reactive power reference value Q*, computation of frequency reference value omega* and voltage modulation amplitude reference value E*, computation of phase reference value Delta* and computation of voltage modulation signals; and only one PI (proportional integral) regulator and two droop control coefficients need to be regulated, thus the whole control method is easy to realize, and further the power system can better supply power to users safely, excellently and economically.

The invention discloses a comprehensive analysis system and method of a power distribution network. The comprehensive analysis system comprises a data acquisition module, a comprehensive analysis module, a modification module and a verification module, wherein the data acquisition module acquires the data of the power distribution network, the comprehensive analysis module carries out comprehensive analysis on the power distribution network based on the data of the power distribution network and obtains a comprehensive analysis result of the power distribution network, the modification module makes a modification scheme for the power distribution network when the comprehensive analysis result of the power distribution network does not accord with a preset standard, and the verification module verifies the performance of the power distribution network modified according to the modification scheme. The comprehensive analysis module carries out comprehensive analysis on the power distribution network, the modification module makes the corresponding modification scheme when the analysis result does not accord with the preset standard to modify the power distribution network, and therefore the comprehensive analysis system and method of the power distribution network achieve comprehensive analysis of the power distribution network, bring convenience to technical personnel in the field for comprehensive analysis of the power distribution network, provide reference for construction, operation and management of the power distribution network, and improve the reliability of the power distribution network.

The invention relates to a method for reconstructing a power distribution network based on double-ant-colony optimization. The method comprises the steps of extracting a looped network, initializing parameters, searching for double ant colonies, decoding a path where each set of ants walks through, obtaining the reconstruction scheme of the power distribution network, conducting looped network detection, island detection and constraint condition detection, judging feasibility of the scheme, judging whether the number of two sets of the ants reaches the ant colony scale or not, judging whether the frequency of information exchange is achieved or not, conducting information exchange, judging whether the terminal condition is met or not, and ending and obtaining the optimum power distribution network reconstruction scheme. The deep searching method is adopted, the reconstruction of the looped network of the power distribution network on a looped network upper interconnection switch and a section switch is determined, digits participating in switch reconstruction are reduced, the problem that when the switch combinatorial dimension in the power distribution network is higher, the searching recovery scheme faces combinatorial explosion is effectively solved, the calculated amount is reduced, and the optimum speed is improved.

The invention relates to an operating data monitoring and alarming system of converting stations, aiming at providing the operating data monitoring and alarming system of the converting stations with excellent real time performances, remote detection function and high intelligentization degree. The operating data monitoring and alarming system of the converting stations comprises information collectors, information concentrator, an operating maintenance server and an on-duty computer terminal; the information collectors are mounted at the converting stations and used for collecting various operating data of the converting stations; the information concentrators are mounted at the converting stations and connected with the information collectors; the operating maintenance server is in communication connection with the information concentrators of the converting stations by a wireless communication network; and the operating maintenance server is in communication connection with the on-duty computer terminal by the internet. The alarming, the failure analysis and the electric quantity statistic are carried out by the wireless network; one machine has a plurality of purposes; the failure maintenance time is reduced; the electric quantity scheduling is favorable; and the power supply quality is improved.

The invention relates to the field of distributed power generation and microgrids and discloses a microgrid on-grid to off-grid switching control system. The system comprises an energy-storage bidirectional converter, an on-grid switch and a controller; one side of the on-grid switch is connected with the output end of a main power source; the other side of the on-grid switch is connected with the output end of the energy-storage bidirectional converter; the output end of the energy-storage bidirectional converter is connected with a controller; if the controller receives a connection command, the controller adjusts main grid side voltage and microgrid side voltage of the on-grid switch in the same period; after the on-grid switch is closed, the energy-storage bidirectional converter converts from a voltage source mode to a current source mode and keeps current power unchanged; after on-grid time reaches set delay time, the energy-storage bidirectional converter outputs active power and reactive power. The invention further discloses a control method based on the system. By the use of the system, the problem that switching of the running mode of a microgrid causes disturbance to a load and a grid is solved, and seamless off-grid to on-grid switching is achieved.

The invention relates to a run-through type non-split-phase balanced power supply electrified railway traction system, belonging to the technical field of railway electric traction power supply. The system comprises traction transformators, all sections of traction networks and current equalizers, wherein, each section of traction power supply network is provided with an energy distribution regulating machine which mainly consists of a main controller, a driver, an electronic power switch bridgearm, a support capacitance arm, three electric current sensors, three voltage transducers and three reactors; A phase of the output end of each traction transformator is connected with the traction power supply network, B phase thereof is connected with the energy distribution regulating machines, and C phase thereof is connected with a steel rail; the main controller of each of the energy distribution regulating machine is connected with a control center. The invention has the advantages that split-phase power supply is changed into non-split-phase power supply, and great run-through of the traction contact network can be realized, so that safe, high speed and high-efficiency running of train can be guaranteed.

The invention discloses a multi-terminal flexible interconnected power distribution network planning method and system, and the method comprises the steps: considering the interaction among a source,a network, a load and a storage, coordinating the respective benefit demands of a distributed power supply operator, a power grid company and a power user, combining the system planning with the operation optimization, and proposing a source-network-load-storage three-layer coordinated planning model for a multi-terminal flexible interconnected power distribution network, processing the uncertainty problem of the distributed power supply and the load by using a scene analysis method, and solving the model by using a hybrid algorithm formed based on a simulated annealing algorithm and an interior point method. According to the invention, benefit requirements of different subjects are considered, friendly interaction of a source, a network, a load and storage is promoted, respective benefitsof a DG operator and a power user are guaranteed, the operation level of the system can be improved, and the power supply quality and economy of system operation are improved.

The invention discloses a wireless sensor network device of a photovoltaic power station, which relates to the technical field of solar photovoltaic power stations, and comprises a network coordinator, a plurality of routing nodes, a plurality of module sensor nodes and an environmental sensor node. The device transfers information of various photovoltaic components to the routing nodes from the module sensor nodes, makes the routing nodes collected to the network coordinator, and also transfers environmental information acquired by the environmental sensor node to the network coordinator through the routing nodes at the same time, and then the network coordinator realizes an interface between data information and the internet; people can promptly know work and environmental information of the photovoltaic components, and can accurately diagnose and position by performing real-time detection, history storage, statistics and analysis on the characteristics of the photovoltaic components to prevent the further enlargement of faults and improve the power supply reliability and power supply quality of photovoltaic power stations; and the device improves the accuracy and anti-jamming capability of the photovoltaic power stations, and realizes the ultralow power consumption and stable work of the photovoltaic power stations.