3005 results about "Electric network" patented technology

Embodiments of the present invention include control methods employed in multiphase distributed energy storage systems that are located behind utility meters typically located at, but not limited to, medium and large commercial and industrial locations. These distributed energy storage systems can operate semi-autonomously, and can be configured to develop energy control solutions for an electric load location based on various data inputs and communicate these energy control solutions to the distributed energy storage systems. In some embodiments, one or more distributed energy storage systems may be used to absorb and/or deliver power to the electric grid in an effort to provide assistance to or correct for power transmission and distribution problems found on the electric grid outside of an electric load location. In some cases, two or more distributed energy storage systems are used to form a controlled and coordinated response to the problems seen on the electric grid.

The invention provides a centralized digital transformer substation system. By adopting various new technologies and new devices, a new level centralized multifunctional intelligent device and a system are realized, thereby laying the foundation for the construction of a digital electric network. Based on an IEC 61850 standard, high speed Ethernet exchange and a virtual local area network (VLAN) technology, the system constructs a digital transformer substation information model and a communication network, and realizes sharing of information of the whole substation. On the basis, function integration of a digital transformer substation is realized and a system structure is simplified. A bay level multifunctional intelligent electronic device, i.e. a system controller integrates the functions of protection, measurement and control, wave recording and the like into a whole, and greatly simplifies the bay level device and wire connection; a process level intelligent terminal integrates the functions of a merging unit and an intelligent operation box into a whole; and all devices of each level provide models and interfaces conforming to the IEC 61850 standard.

Embodiments of the present invention include control methods employed in multiphase distributed energy storage systems that are located behind utility meters typically located at, but not limited to, medium and large commercial and industrial locations. These distributed energy storage systems can operate semi-autonomously, and can be configured to develop energy control solutions for an electric load location based on various data inputs and communicate these energy control solutions to the distributed energy storage systems. In some embodiments, one or more distributed energy storage systems may be used to absorb and/or deliver power to the electric grid in an effort to provide assistance to or correct for power transmission and distribution problems found on the electric grid outside of an electric load location. In some cases, two or more distributed energy storage systems are used to form a controlled and coordinated response to the problems seen on the electric grid.

The invention relates to an intelligent power distribution network and power-consumption real-time monitoring and managing system, which comprises an electric power user centralized-control terminal device, a data transmission device and a system monitoring server; the electric power user centralized-control terminal device is used for receiving power consumption information of an electric power user monitoring device and for outputting a signal for controlling the user monitoring device; the data transmission device is connected downwards with at least one electric power user centralized-user terminal device and is connected upwards with the system monitoring server through a cabled network. The system has the advantages that: instant interaction and information communication between the electric power enterprise and the users are realized, and the information interaction and communication inside the electric power enterprise are realized; emergent item protection of electric network and devices is realized; and the system can instantly collect the running data of all circuits and devices in the electric distribution network, can collect the state data of the device, and can collect the data of measuring devices, running data of communication transmission system and the state data, image data, audio data and video data of the transmission devices.

The present invention discloses an integrated universal simulation test system for electric network scheduling and electric quantity collection, a telemechanical terminal is connected with a test control device through an instation network, an electrical energy remote terminal is connected with a plurality of electric energy meters. The simulation test system is provided with a portable computer, and has a function of processing the remote measurement, remote signaling, remote control data of an automatic SCADA system and electric energy meter data of a electric quantity collection terminal simultaneously or separately; a specification analysis function of the automatic SCADA system and electric quantity collection system; the specification is an usual specification, or is added with a plug-in card mode. By means of the technical scheme, the system has stable operation and perfect functions; the system is portable and is flexible to be employed; the system has high reliability and well expandability, openness, compatibility, and excellent maintainability and easytouse; it is capable of expanding and modifying the specification expediently, and it is capable of plugging and playing.

The invention relates to an intelligent control device of a high power energy saving electromagnetic stove, and the method thereof, The intelligent control device comprises a controllable rectifying and filtering module, a contravariant module and a microcomputer controlling module, which is characterized in that a three-phase alternating current power supply is rectified into an adjustable direct current power supply through the controllable rectifying and filtering module ; the direct current power supply is inverted into a high frequency alternating current power supply through the contravariant module, and then the electric energy is converted into electromagnetic energy to be radiated to the bottom of a cookware, and vortex flow is generated, and the cookware can be heated because of the thermal effect of the vortex flow; the microcomputer controlling module is the core of the entire system, which is used for collecting data and transmitting control information to each module; the device adopts a series of advanced control policies, such as the trigger control of the rectifier bridge of an PI regulator, the intelligent self-adaptive constant power control, the intelligent soft-start control, the intelligent cookware detection control, etc., and thereby the working stability and the security of the electromagnetic stove are enhanced. The harmonic pollution of the equipment to the electric network can be reduced to the utmost extent when the electric energy of the electromagnetic stove is saved, and the electromagnetic stove is suitable for various kitchens and dining rooms.

A mechanism for ensuring the physical location of data processing devices as a security check is provided. With this mechanism, security data is transmitted to data processing devices via an electrical network and is used to perform a security check to determine if the data processing device may operate. The data processing devices may be limited such that they may only power-up, boot-up, or remain operational when they are coupled to the electrical network. Thus, they must be physically located such that they may gain access to the electrical network. In addition, a security check may be used to control which data processing devices may communicate data packets with one another over the data network. When a data packet is received by a data processing device, security data in the data packet is compared against a local history of security data received by the recipient of the data packet via the electrical network. If matching security data is found in the history for the same time represented by an associated timestamp, then the sending data processing device and the receiving data processing device are determined to be present on the same electrical network and may communicate with one another.

The invention discloses a fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage. A novel resonant phase locked loop (PLL) can quickly compensate phase tracking errors caused by various network faults, effectively inhibit frequency fluctuation and phase jitter caused by a negative sequence and a harmonic component in the network voltage, and realize accurate detection of fundamental voltage synchronous signals in a distorted network. The method can meet the detection requirements on voltage frequency, amplitude and phase under the ideal network conditions, is particularly suitable for capturing the fundamental voltage synchronous signals under severe transient state and stable state network faults such as network voltage drop, unbalance, harmonic pollution and the like, and can realize quick extraction of the positive and negative sequences and the harmonic component in the voltage. The method has the characteristics of highdetection accuracy and good real-time property, can provide an accurate control basis for operating control of grid-connected power equipment such as various wind generating sets, solar photovoltaic grid-connected devices, reversible speed control transmission systems, dynamic reactive compensators and the like.

A systematic approach is presented for the development and implementation of cost-effective transmission asset maintenance strategies. The overall concept and methodology are based on transmission reliability and risk management and address the value of preventive maintenance activities. This may help electric network utilities conduct maintenance policy assessment, region-wide criticality analysis, and optimal maintenance resource allocation and task scheduling.

The invention discloses a comprehensive collection method and a device with three-state data of electrical parameters: steady state, fault recorder data and dynamic data, and the device is characterized in that the device consists of a high-precision time synchronization module, a synchronous sampling pulse module, an alternating current signal conditioning module, an A/D sampling module, a direct current signal conditioning module, a voltage frequency conversion module, a switch quantity signal conditioning module, a signal processing module, a recording module and a high-speed network communication module, etc. The method and the device have the advantages that: the use of the high-precision time synchronization module and the high-performance signal processing and the communication technologies can realize the synchronous collection of the three-state data of the electrical parameters, complete the functions of monitoring, fault recording, phase angle measurement and power quality analysis, etc., improve the data processing capability and the sampling precision, improve the real-time property of an automatic system of a substation, simplify the design, the manufacture and the operation of secondary equipment of the automatic system of the substation and greatly reduce the construction cost and the maintenance cost of the substation.

The invention relates to a judging method of the solid insulating and aging degrees of a transformer, which sequentially comprises the following steps of: 1. preparing a gradient concentration standard solution of a furfural solution, carrying out liquid chromatographic detection, and making a standard curve I; 2. taking insulating paper samples in an actual electric network transformer, carrying out the liquid chromatographic detection, and obtaining the furfural concentration in each sample according to the standard curve I; 3. respectively measuring the water content H thereof by adopting the insulating paper samples in the step 2, computing the dry paper concentration C, additionally sampling, measuring the specific viscosity thereof, and computing the polymerization degree of the insulating paper samples according to a Martin empirical formula; 4. making a standard curve II by using the polymerization degree of insulating paper as an abscissa and using the logarithm of the furfural concentration as an ordinate; and 5. measuring the furfural concentration for an unknown sample, obtaining the polymerization degree of the insulating paper according to the standard curve II in the step 4, and judging the solid insulating and aging degrees of the transformer according to an IEC60450 standard. The method only needs to extract proper oil samples, has simple operation, does not need power failure, and is a quite practical method.

The present invention relates to a battery energy storage topology structure without the transformer based on MMC modularized multi-level inverter: every phase is connected in series with several subunits which are composed of half-bridge power modules and battery energy storage modules, and get access to the electrical network through buffer inductance. The half-bridge power module is formed by the series connection of an even number of n power units, which is divided into two groups, the upper group and the lower group; the number of each group's power units is n/2; the number of output phase voltage level step is n/2 + 1; the number of line voltage level step is n + 1; the output terminal of every phase is the midpoint of two groups of units, and the output terminal is connected with each group of unit by coupling inductance or uncoupling inductance. The power unit is in a half-bridge structure. As the topology is in parallel connection with electrical network, the electric power pollution of electric network can be inhibited; and the topology can make up for the instability of photovoltaic or wind energy generation to provide uninterrupted, clean, stable and high-qualified sine wave voltage of no frequency discontinuity to the load of the electrical network.

The invention provides a network voltage disturbance generating device, which comprises a three-phase bridge type PWM (Pulse Width Modulation) rectifier and a three-H-bridge three-phase four-wire-system PWM inverter, wherein the alternating current side of the rectifier is connected with an electric network through an L type filter; the direct current side of the rectifier is connected in series with the direct current side of the three-H-bridge three-phase four-wire-system PWM inverter; an LC filter is connected to the alternating current side of the three-H-bridge three-phase four-wire-system PWM inverter; the output end of the LC filter is connected with an isolation transformer; and the secondary side of the isolation transformer is connected with a load. The invention further provides a control method suitable for the device. Due to the adoption of the device provided by the invention, the simulation of a network voltage amplitude, frequency disturbance and an electric network harmonic phenomenon can be realized, bilateral flow of energy can be realized, and active energy transmitted by tested solar-powered grid-connected equipment is fed back to the electric network; and the control method is easy and convenient to implement, and a target reference value can be accurately tracked; and moreover, quick response and small steady-state errors are realized, so that electric network disturbance can be simulated accurately.

The present invention relates to a geographical information system used for electrical power system, wherein the system comprises a human-computer interface module, a basic geography data module, a elementary graph operation module, a view display module, a electric network device management module, a power distribution network equipment input module, a power distribution network equipment attribute maintenance module, a electric power network topology maintenance module, a line maintenance module, a underground pipe network management module, a search statistical form module, a pole tower detailed statement management module, a network topology maintenance module, a electric network topology analysis function module, a single line figure management module, a scheduling system drawing management module, a graph input-output function module and a system administration module, wherein the human-computer interface module connects with every other module mutually. Compared with prior art, the present invention is provided with definite openness, normality, flexibility, expandability, high security and economy, and the like.

The invention discloses a power compensation method for unbalanced direct power control of a voltage controlled grid-connected inverter, which is suitable for direct power control (the conventional direct power control) without synchronous speed rotational coordinate transformation. The method comprises the following steps of extracting negative sequence voltage signals and positive sequence current signals by collecting voltage and current signals of a three-phase electric network; and computing compensation items of active and reactive power according to selected control targets. In the method of the invention, the compensation items of active and reactive power are injected in the power reference signals of the conventional direct power control according to required control targets so as to respectively eliminate negative sequence current, double frequency fluctuation of the active power and double frequency fluctuation of the reactive power in the electric network, caused by unbalanced voltage in the electric network, and fit different application situations. The invention has the advantages of enhancing the capabilities of control and uninterrupted operation of the voltage controlled grid-connected inverter when the electric network is in an unbalanced fault.

The invention provides a wireless charging system for an electric automobile, to solve the problems of electrical leakage and physical deterioration of charging plant. The wireless charging system comprises a sending end connected to an electric network and a receiving end disposed on the automobile, wherein the sending end comprises a wireless communication unit and a sending unit. The sending unit is formed by serially connecting a rectification filter circuit, a high frequency inverter circuit and a sending loop. The receiving end comprises a wireless communication unit and a receiving unit. The receiving unit is formed by serially connecting a receiving loop and a rectification filter circuit. In the manner of high-efficient wireless transmission, the wireless charging system for an electric automobile of the invention solves the problems of electrical leakage and physical deterioration of charging plant, so the charging mode of the automobile is simpler, faster and more reliable.

The invention discloses a system for data communication between a power distribution master station system and a power distribution terminal. The system comprises at least one wireless data collection terminal and an access point network (APN) transmission network, wherein the wireless data collection terminals are connected with the power distribution terminal one by on and used for collecting electric power information of grid primary equipment in the corresponding power distribution terminal, and transmitting the collected electric power information to a mobile communication network through a preset communication protocol, or transmitting command data received through the mobile communication network to the corresponding powder distribution terminal; and the APN transmission network is used for receiving the electric power information which is transmitted to the mobile communication network from each wireless data collection terminal according to the preset communication protocol and transmitting the electric powder information to the master station system or forwarding the command data transmitted by the master station system to the corresponding wireless data collection terminal through the mobile communication network. The invention also discloses a corresponding method for data communication between the distribution master station system and the distribution terminal. The system and method provided by the invention ensure the security and accuracy of data transmission and great reduction of communication cost.

The invention relates to a power distribution network fault diagnosis system based on topology knowledge and a method. The system comprises a resource layer, a knowledge layer and a diagnosis layer. The resource layer comprises a fault oscilloscope, a monitoring terminal, a distribution equipment machine account, a topology file and a database. The monitoring terminal is used for collecting switch state information after a fault. The fault oscilloscope is used for obtaining waveforms after the fault. The topology file is used for providing an electrical wiring diagram of a whole electrical network. The distribution equipment machine account is used for obtaining operation conditions in the fault of power distribution equipment. The knowledge level comprises a knowledge base providing information for the diagnosis layer. The diagnosis layer comprises a fault diagnosis server. The fault diagnosis server is provided with a fault diagnosis program module. According to the method, topology knowledge formation and fault diagnosis are realized through the above system. The system and the method can carry out fault analysis after the fault and provide references for operation personnel, so that manpower, financial resources and time are saved. In addition, the system is highly efficient and rapid in operation, and the usage effect is good.