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55results about How to "Improve voltage distribution" patented technology
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Bidirectional VSC converter with a resonant circuit
InactiveUS6898095B2Reduce decreaseImprove voltage distributionAc-dc conversion without reversalEmergency protective arrangements for automatic disconnectionPhase leadTransverter
The invention relates to a VSC-converter for converting direct voltage into auxiliary voltage and vice versa, which comprises a series connection of at least two current valves (5, 6) arranged between two poles (7, 8), a positive and a negative, of a direct voltage side of the converter, each current valve comprising several series connected circuits (12), each of which circuits comprising a semiconductor component (13) of turn-off type and a rectifying component (14) connected in anti-parallel therewith, an alternating voltage phase line (16) being connected to a midpoint (15), denominated phase output, of the series connection of current valves (5, 6) between two of said current valves while dividing the series connection into two equal parts. Each of the series connected circuits (12) of the respective current valve comprises, in order to make possible a good voltage distribution between the semiconductor components (13) of turn-off type included in the respective current valve, a snubber capacitor (17) connected in parallel with the semiconductor component (13) of turn-off type included in the circuit. The converter (1) further comprises a resonance circuit (18) for recharging the snubber capacitors (17) of the current valves.
Owner:ABB (SCHWEIZ) AG
Composite high-voltage casing and its production process
The present invention discloses a pure dry composite housing high-voltage sleeve and its production method. Its main insulating layer is a multilayer series-connected pure solie concentric ylinder insulating layer made up by at least using two kind of solid layers which are spaced and tightly combined, the insulating housing and connecting sleeve are tightly connected with external side of main insulating layer. The production method includes the following steps: using peoxy glass fibre wet winding-forming process to make semi-conductor band and glass fibre material coated with epoxy resin wind round the conducting bar according to sinesoid law to make main insulating layer, solidifying and surface processing, fixing connecting sleeve, mounting insulating housing, equalizing cover and wiring terminal, it contains no any oil or gas, can prevent leakage of oil and gas and explosion hidden peril, and its weight is light and small in volume, and cost is low.
Owner:ZHONGNENG RUISITE ELECTRICAL BEIJING
Large photovoltaic power station reactive optimization method based on improved immune particle swarm optimization algorithm
InactiveCN105186556AImprove voltage distributionPhotovoltaicsSingle network parallel feeding arrangementsStable stateTransformer
The invention relates to a large photovoltaic power station reactive optimization method based on improved immune particle swarm optimization algorithm, and belongs to the technical field of photovoltaic power station control. The method comprises the following steps: 1) establishing a photovoltaic power station stable state operation model to analyzing the voltage, wherein the model comprises an instation current collection line, a step up transformer and power transmission line impedance; 2) establishing a multi-target reactive power optimization model, and performing fuzzy processing of multiple targets; and 3) solving by using the improved immune particle swarm optimization algorithm. The large photovoltaic power station reactive optimization method based on improved immune particle swarm optimization algorithm can significantly improve the grid-connection point voltage and the instation voltage distribution, and can significantly reduce the instation active loss when the power station outputs greatly.
Owner:STATE GRID CORP OF CHINA +3
Electrodes comprising mixed active particles
InactiveCN101663710AHigh cycle capacityImprove featuresNon-metal conductorsLi-accumulatorsCharge carrierActive particles
A battery containing a first electrode and a second electrode, and an electrolyte for transferring ionic charge-carriers there between, wherein the first electrode contains a first electrode active material represented by the formula A<2>eM<4>kM<5>mM<6>nM<7>oOg, and at least one second electrode active material selected from the group consisting of active materials represented by the formula A<1>aM<1>b(XY4)cZd, active materials represented by the formula A<3>hMniO4, and mixtures thereof.
Owner:VALENCE TECH INC
Optimized load shedding method with consideration of influence of distributed power supply
ActiveCN108134394AMeeting Outage Loss TargetsIncrease profitPower network operation systems integrationSingle network parallel feeding arrangementsLoad SheddingDistributed power
The invention discloses an optimized load shedding method with consideration of the influence of a distributed power supply. All nodes in a distribution network upload interruptible load capacities ata current time and load priority levels to a centralized controller at a root node and the centralized controller establishes an optimized load shedding model with consideration of an outer net equivalence according to the uploaded information and a flow restraint; the centralized controller converts a non-linear flow restraint into one in a convex second-order cone mode by means of second-ordercone relaxation and thus calculates an optimized load shedding value with consideration of the distributed power supply output influence rapidly, and issues the information to all node control units;after all nodes perform a load shedding action, a measuring unit monitors whether the node voltages are restored to be in a rated range and determines whether to complete the load shedding process. With the method disclosed by the invention, quick and precise load shedding controlling is realized in a distribution network including lots of distributed power supplies and the voltage of the distribution network is restored to the greatest extent; limit exceeding of the voltage of the distributed power supply is avoided; and thus over-voltage tripping of the distributed power supply caused by theimproper load shedding is avoided.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +4
Terminal connection box for optical phase conductor
The invention relates to a terminal connection box for an optical phase conductor, which is an optical cable connection box for 220KV optical phase conductor (OPPC). The connection box is provided with an upper box body and a lower box body, a composite hollow insulator is arranged between the upper box body and the lower box body, and an equalizing ring is arranged between the upper box body and the composite hollow insulator; the upper box body is provided with an optical phase conductor clamp, and a cable feeding hole is provided with an introduction tube, a rubber ring I and a nut; the cable feeding hole is internally provided with a rubber cone I and a small pressure ring I; the bottom of the upper box body is provided with a large pressure ring, a small pressure ring II and a rubber cone II; the large pressure ring is provided with a support screw I, a disc fiber board I and a disc fiber board cover I; the upper part of the upper box body is provided with a sealing gasket and an upper cover; the composite hollow insulator is internally penetrated by an optical fiber unit and filled with silica gel; the lower box body is provided with a sealing device of the optical fiber unit, an introduction cable of the lower box body is provided with an introduction cable clamp, a rubber ring II and a nut II; and the lower box body is internally provided with an optical fiber storage device.
Owner:JIANGSU ZHONGTIAN TECH CO LTD
A two-layer voltage optimization method for low-speed decentralized wind power integration into distribution network
ActiveCN109149593AImprove voltage distributionFlexible AC transmissionReactive power adjustment/elimination/compensationLow speedV curve
The invention relates to a double-layer voltage optimization method for integrating low-speed distributed wind power into distribution network, comprising the following steps: 1) constructing a double-layer voltage optimization model according to a model of a low-speed wind turbine generator system and a SVC; 2) In the upper layer model, the multi-objective programming problem of low-speed wind turbine location is solved, and the optimal type and location of low-speed wind turbine are obtained. After the location of low-speed wind turbine is selected, Q-V-curve method is adopted to determine the optimal access location of SVC; 3) The optimal type, access position and optimal access position of SVC of low-speed wind turbine in the upper layer model are transferred to the lower layer model,and the reactive power control method of coordinated voltage regulation between DFIG and SVC based on fuzzy logic is established, so that the parallel voltage of wind turbine can be raised to the range of continuous operation. Compared with the prior art, the invention has the advantages of considering low wind speed, load fluctuation and user behavior characteristics of the load of the distribution network, improving the overall voltage distribution of the distribution network and the like.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Power flow control method for flexible multi-state switch connected to distributed power supply
ActiveCN111416357AUninterrupted and flexible regulationReduce the required powerElectric power transfer ac networkSingle network parallel feeding arrangementsPower flowMathematical model
The invention discloses a power flow control method of a flexible multi-state switch connected to a distributed power supply. The method comprises the following steps: 1, constructing a power model ofthe flexible multi-state switch connected to the distributed power supply and a mathematical model of a voltage source type converter of each port; 2, calculating the load rate of each feeder line before the flexible multi-state switch is accessed and the load rate required to be balanced after the flexible multi-state switch is accessed, and deriving the active power adjusted by the connected flexible multi-state switch port voltage source type converter; 3, calculating the input active power of the distributed power supply allocated to each feeder line according to the active capacity ratioof each feeder line; 4, calculating the total active power output to each feeder line by the flexible multi-state switch connected to the distributed power supply. According to the invention, the load active power imbalance among the feeder lines can be adjusted, and the active power input by the distributed power supply is optimally distributed, so the power fluctuation caused by the access of the distributed power supply to a single feeder line can be reduced, and the intermittent energy consumption level is improved.
Owner:HEFEI UNIV OF TECH
Reactive power optimization control method based on active power output of photovoltaic power station
PendingCN109274135AImprove internal voltage distributionReduce active lossSingle network parallel feeding arrangementsPhotovoltaic energy generationControl modelsDifferential evolution
The invention discloses a reactive power optimization control method based on active power output of a photovoltaic power station, belonging to the technical field of photovoltaic power station operation control. The method of the invention comprises: the parameters of each photovoltaic inverter and SVG in the photovoltaic power station are obtained, The active power output P* of the photovoltaicpower station and the voltage control instruction of the grid connection point issued by the grid dispatching center (img file = 'DDA000179000293000011. TIF' wi= '126' he= '86' / ) are calculated to obtain the reactive power compensation amount of the photovoltaic power station Q*; Calculate the reactive power capacity Qmax, Qmin of the photovoltaic power station; Taking the reactive power output ofPVGU and SVG as the control object, taking the minimum voltage deviation and the minimum active power loss of photovoltaic power station as the optimization objective, and transforming the fuzzy theory into a single objective optimization problem, the reactive power optimization control model based on the active power output of photovoltaic power station is established. Differential evolutionaryalgorithm is used to solve the model.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
High-voltage AC (alternate current) and DC (direct current) voltage divider with heat dissipation structure
The invention relates to a high-voltage AC (alternate current) and DC (direct current) voltage divider with a heat dissipation structure and belongs to the field of calibration, verification and detection of power equipment. According to the invention, radiating fins are arranged on the lower surface of a cover board and the outer surface of a conductive outer barrel of the high-voltage AC and DC voltage divider, a closed cavity is surrounded by a chassis, the cover board, the conductive outer barrel and an insulating outer barrel and insulating gas or oil is filled into the cavity, so that the effect of rapidly transferring heat inside the voltage divider into the outside environment is achieved, the temperature gradient of inner and outer barrels is effectively reduced, the potentials inside and outside the voltage divider are kept consistent and the measurement accuracy and the using safety are improved.
Owner:STATE GRID CORP OF CHINA +1
Dynamic voltage regulation control method under distributed photovoltaic-cluster non-communication condition
ActiveCN107294105AReduce risk of going offlineImprove voltage distributionAc network voltage adjustmentAc networks with different sources same frequencyVoltage optimisationLinearization
The invention provides a dynamic voltage regulation control method under a distributed photovoltaic-cluster non-communication condition and belongs to the electric power system operation and control technology field. The method comprises the following steps of establishing a distributed photovoltaic cluster voltage optimization model and a branch trend equation of a distributed photovoltaic cluster respectively, and carrying out linearization on the branch trend equation so as to obtain the branch trend equation of distributed photovoltaic cluster linearization, and converting to a matrix branch trend equation; after solving a matrix equation, converting the optimization model so as to acquire an approximate optimization model; using a distributed quasi-Newton method to solve the approximate optimization model; based on an iterative result, carrying out reactive power control on each node in the distributed photovoltaic cluster and determining whether iteration converges; and if the iteration converges, ending voltage control of the distributed photovoltaic cluster. By using the method, a reactive power regulation capability of distributed photovoltaic power generating nodes is fully used, construction of a communication system is avoided, a calculating burden of the system is mitigated and operation and maintenance cost is reduced.
Owner:TSINGHUA UNIV
Voltage bilevel optimization droop control method for distributed photovoltaic cluster
ActiveCN107910891AReduce risk of going offlineImprove voltage distributionForecastingSingle network parallel feeding arrangementsBilevel optimizationVoltage
The invention provides a voltage bilevel optimization droop control method for a distributed photovoltaic cluster, which belongs to the technical field of power system operation and control. The method includes steps of: establishing a distributed photovoltaic cluster droop curve optimization layer and a distributed photovoltaic local reactive power control layer respectively, two levels executingsimultaneously and separately, and the distributed photovoltaic cluster droop curve optimization layer periodically sending the optimization result to the distributed photovoltaic local reactive power control layer to enable the latter to adjust the reactive power output in real time according to the fluctuation of the system state, respond to the system's reactive power regulation requirements to the greatest extent, solve the contradiction between optimization calculation, cycle communication and real-time control, and reduce the photovoltaic off-net risk. The method fully utilizes the reactive power adjustment capability of distributed photovoltaic power generation nodes, reduces the calculation burden of the system, and reduces the operation and maintenance cost.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
Micro-grid energy storage optimal configuration method and device in consideration of full life cycle cost
ActiveCN110867852ALow costImprove voltage distributionAc network load balancingFull life cycleControl engineering
The present application relates to a micro-grid energy storage optimal configuration method and device in consideration of full life cycle cost. The micro-grid energy storage optimal configuration method in consideration of full life cycle cost includes: obtaining the data of an energy storage system to be configured to obtain target data; obtaining a pre-established energy storage optimization model, the energy storage optimization model including an outer layer optimization model and an inner layer optimization model; based on the target data, obtaining the optimal solution of the energy storage optimization model by a genetic algorithm and a simulated annealing algorithm so as to obtain an optimal configuration result, wherein the optimal configuration result at least includes the ratedpower, the rated capacity and the economic operating power; and configuring the energy storage system to be configured according to the optimal configuration result. The method provided by the present application can minimize the cost and maximize the benefits of the energy storage system during the full life cycle.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Partial tree based power distribution network capacitor parallel compensation computing method
InactiveCN105322553AReduce line loss rateImprove voltage distributionEnergy industryReactive power adjustment/elimination/compensationComputer scienceCapacitor
A partial tree based power distribution network capacitor parallel compensation computing method is disclosed. The computing method comprises the steps of obtaining information of a power distribution network; initially calculating an initial compensation scheme of parallel compensators; judging whether the partial trees need to be re-divided; dividing the corresponding partial tree; separately determining the compensation points for each partial tree; judging whether the partial trees need to be re-optimized; further optimizing the compensation points; comparing benefit investment ratio and performing circular judgment until the numbers of each compensation node and the compensation capacities of each compensation node under the maximum benefit investment ratio are output. According to the partial tree based power distribution network capacitor parallel compensation computing method, the capacitor parallel compensation sites and compensation capacities of the radiation type power distribution networks can be provided; and the line loss rate in the running process of the power distribution networks can be more effectively reduced to improve the voltage distribution in the running of the power distribution networks and to improve the economical benefit and the power supply reliability in the running of the power distribution networks, so that computing method is high in practical value.
Owner:BEIJING XJ ELECTRIC
Load moment and distributed power supply access power distribution network-based low-voltage treatment method
InactiveCN113410843AAvoid misjudgmentAvoid missed judgmentData processing applicationsAc network voltage adjustmentDistributed powerDistributed computing
The invention provides a normalized load moment and distributed power supply access power distribution network-based low-voltage treatment method. The method comprises the steps of S1, calculating to obtain the load moment of each line meeting the minimum voltage; s2, selecting a to-be-accessed position of the distributed power supply based on the load moment; s3, constructing an objective function of a locating and sizing model for accessing the distributed power supply to the power distribution network; and S4, determining constraint conditions of the distributed power supply access power distribution network locating and sizing model, and finally determining the access address and capacity of the distributed power supply. According to the method, the problem that the load moment cannot be solved when lines of different models are connected in a mixed mode is solved, voltage distribution is improved through locating and sizing of the distributed power supply based on the normalized load moment, meanwhile, the investment cost of a power distribution network can be reduced, and economic benefits are improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Reactive compensation adjustment method
ActiveCN106877355AImprove voltage distributionImprove voltage stabilityReactive power adjustment/elimination/compensationSystems intergating technologiesPower gridEngineering
The invention discloses a reactive compensation adjustment method, relates to the field of power grid operation technologies, and solves the technical problems that according to an existing method for adjusting voltage of a power grid by using a static reactive compensator, the adjustment range of the voltage of the power grid is relatively small, and the reactive compensation requirement of the power grid cannot be met, so that the voltage of the power grid is non-uniformly distributed, and the requirement of operating the power grid safely and stably cannot be met. The reactive compensation adjustment method comprises the steps of building a reactive optimization model for reactive compensation adjustment, and acquiring an optimal reactive compensation adjustment scheme; and performing reactive compensation on the power grid according to the optimal reactive compensation adjustment scheme. The method provided by the invention is applied to reactive compensation adjustment of the power grid.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
Mixed integer linear programming model for optimized operation of power distribution network energy storage system
ActiveCN111614113AHigh precisionReduce operating costsElectrical storage systemFlexible AC transmissionElectricity distribution systemsPower grid
The invention relates to a mixed integer linear programming model for the optimal operation of a power distribution network energy storage system. Because the number of the battery energy storage systems deployed in a power distribution system is continuously increased, a new model is needed to describe the real characteristics. Besides the active power, the energy storage system can also exchangethe active power with the power grid through inverter connection. Although some existing work considers the problem, research on a linear model suitable for an actual large-scale power distribution system is not sufficient enough. Under the background, the mixed integer linear programming model for the optimized operation of the power distribution network energy storage system is provided. First,the model considers various parts of a battery energy storage system, including a battery pack, an inverter and a transformer, and the linear modeling of active power and apparent power limits, and then, the system power loss is calculated by adopting a linear power flow model, so that the precision is higher.
Owner:JIANGSU ELECTRIC POWER CO +1
Suspended insulator
InactiveCN1417812AAnti-fouling coronaImprove voltage distributionSuspension/strain insulatorsCorona dischargeEngineering
Provided is a suspension insulator capable of individual improvement of damaged voltage resistance and damaged corona discharge prevention. With the suspension insulator equipped with a plurality of ring- shaped ribs formed with a pin metal fitting implanted at the center part as an axis on the undersurface just outside where glaze is applied, a resistance strip 31 with a surface resistance (1 cm× 1 cm) of not more than 4 MΩ is set, a ring-shaped conductive strip 32 at an outer periphery of the resistance strip 31, and further, (1) a conductive glaze layer consisting of the resistance strip 31 and the conductive strip 32 is fitted inside the ribs having a length of not less than 4% of leakage distance, and / or, (2) diameter of the outer periphery of the conductive glaze layer of the underside consisting of the resistance strip 31 and the conductive strip 32 is to be not more than twice that of a cap part on the top face.
Owner:NGK INSULATORS LTD
High frequency semiconductor switch
ActiveUS8674415B2Improve voltage distributionLoss of characteristicTransistorSolid-state devicesEngineeringField-effect transistor
There is provided a high frequency semiconductor switch for improving insertion loss characteristics and harmonic characteristics by providing good voltage distribution in a gate wiring. The field effect transistor includes a source wiring electrically connected to a source region formed on a substrate and extending unidirectionally; a drain wiring electrically connected to a drain region formed on the substrate and extending in parallel with the source wiring; a gate having a parallel portion extending between the source wiring and the drain wiring in approximately parallel with the source wiring and the drain wiring; a gate wiring applying voltage to the gate; and a gate via electrically connecting the gate to the gate wiring, the parallel portion including two ends and formed with a path applying voltage to each of the two ends from the gate via.
Owner:SAMSUNG ELECTRO MECHANICS CO LTD
Arrester
InactiveCN100379107CDependence on reducing steepnessImproved action parameter propertiesSpark gaps with auxillary triggeringElectric lighting sourcesOvervoltageCapacitance
The spark clearance has as much possible partial spark clearances connected in series, in particular, these partial spark clearances are wired by capacitor (6) except the first spark clearance reacting in the case of overvoltage phenomenon, and, in particular, the second spark clearance and each spark clearance other than it are connected with common reference electric potential (4), particularly, ground potential through the capacity (6). To markedly improve reaction characteristic of a spark clearance, a bypass (7) composed of an auxiliary spark clearance (8) having a smaller reaction voltage than a reaction voltage of a single spark clearance or these partial spark clearances and at least one varistor (9) is connected in parallel with a multiple spark clearance composed of the single spark clearance or a plurality of partial spark clearances connected in series.
Owner:OBO BETTERMANN GMBH & CO KG
Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container
InactiveUS20150108031A1Improve barrier propertiesIncrease laborElectric discharge tubesPackaging corrosive chemicalsDielectricProduct gas
A barrier-film forming apparatus that forms a barrier film on an inner face of a container having a concave or convex portion as a processing target, including: a dielectric member having a cavity sized to enclose the container, an external electrode covering an outer circumference of the dielectric member, an exhaust unit installed on an end face of the external electrode on a side where a mouth of the container is located, with an insulating member interposed therebetween, and depressurizing inside of the container through an exhaust pipe, an internal electrode inserted from a side of the exhaust pipe and also serving as a gas blowout unit that blows out medium gas for generating a barrier film into the container, and an electric-field applying unit that applies an electric field for generating exhaust between the external electrode and a ground electrode.
Owner:MITSUBISHI HEAVY IND MACHINERY SYST LTD
Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container
ActiveUS8950356B2High barrier propertyImprove barrier propertiesLiquid surface applicatorsElectric discharge tubesElectric fieldEngineering
A barrier-film forming apparatus that forms a barrier film on an inner face of a container having a concave or convex portion as a processing target, including: a dielectric member having a cavity sized to enclose the container, an external electrode covering an outer circumference of the dielectric member, an exhaust unit installed on an end face of the external electrode on a side where a mouth of the container is located, with an insulating member interposed therebetween, and depressurizing inside of the container through an exhaust pipe, an internal electrode inserted from a side of the exhaust pipe and also serving as a gas blowout unit that blows out medium gas for generating a barrier film into the container, and an electric-field applying unit that applies an electric field for generating exhaust between the external electrode and a ground electrode.
Owner:KIRIN BREWERY CO LTD +1
A multi-terminal flexible direct current transmission system-level coordination control device
ActiveCN104578187BAdjust the tidal current distributionPrevent overloadElectric power transfer ac networkSingle network parallel feeding arrangementsData acquisitionOperation mode
The invention discloses a multi-end flexible direct current power transmission system level coordinate control device which comprises a data collecting module, a data processing module, a control function processing module, a communication management module and a redundancy control module. The data collecting module is responsible for process data collection and data collection of analog quantities such as state signals, voltage and current and generates input data needed by the control function processing module. The control function processing module comprises an active control module, a reactive control module, a direct-current voltage control module, a VF control module and the like, finally, reference value signals of voltage, active power, reactive power, frequency and the like of a converter station are generated, the reference value signals are sent to a converter station unit controller through the communication management module to complete a system control target. The multi-end flexible direct current power transmission system level coordinate control device can conduct emergent operation control which includes conversion of the system operation mode and the control mode, emergent running stopping and locking control under some faults, fault switching of a redundant system, resetting operation control after alarming or protecting actions and the like, and the reliability of integrated design of the system is improved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
Electrical switchgear
InactiveCN101053051AHigh dielectric strengthImprove voltage distributionHigh-tension/heavy-dress switchesAir-break switchesCapacitanceElectricity
Electrical switchgear, e.g. a circuit breaker, must in general provide good dielectric strength in open position in order to avoid discharge. To improve the dielectric strength capacitors are often arranged in parallel between the contacts of the switchgear. For very high voltage applications, e.g. >500kV, two circuit breaker are connected in series for switching such high voltages, i.e. the total voltage to be switched needs to be shared equally by the two switches. Because of the required capacitance the capacitor and hence also the switchgear is big, especially of great diameter, and costly. According to the present invention shields (10, 11) are arranged in order to form additional capacitors C1'', C1''' and C2 between the shields (10, 11) and between a connecting means (4), connecting the two switches (2, 3), and the enclosure (5). The resulting switchgear 1 has increased dielectric strength and the total voltage is essentially equally shared by the two switches (2, 3) in series.
Owner:SIEMENS AG
Radio frequency switch circuit, chip, and communication terminal
PendingUS20210313982A1Improve voltage distributionUniform voltage distributionTransistorElectronic switchingParasitic capacitanceHemt circuits
Disclosed are a radio frequency switch circuit, a chip, and a communication terminal. In the radio frequency switch circuit, a switch chain is formed by at least one switch unit being provided between a first port and a second port; each switch unit is connected to a first bias circuit and to a second bias circuit; further adjustments are made to the ratio of the parasitic capacitance between MOS transistors of each switch unit to a third capacitance; and adjustments are made to the size of said MOS transistors as well as to the ratio of said size to the third capacitance. In this way, voltage distribution uniformity on the switch chain may be improved, thus increasing the overall voltage withstand ability of the radio frequency switch circuit, and reducing the occurrence of harmonic events.
Owner:VANCHIP TIANJIN TECH
Microgrid energy storage optimization configuration method and device considering full life cycle cost
ActiveCN110867852BLow costImprove voltage distributionAc network load balancingFull life cycleControl engineering
The present application relates to a method and device for optimizing configuration of microgrid energy storage in consideration of full life cycle cost. The microgrid energy storage optimization configuration method considering the life cycle cost includes: obtaining the data of the energy storage system to be configured to obtain the target data; obtaining a pre-established energy storage optimization model, the energy storage optimization model includes the outer layer optimization model and An inner layer optimization model; according to the target data, the optimal solution of the energy storage optimization model is solved by a genetic algorithm and a simulated annealing algorithm to obtain an optimal configuration result, and the optimal configuration result includes at least the rated power, the rated capacity and the economical operating power; configuring the energy storage system to be configured according to the optimized configuration result. The method provided in this application can minimize the cost and maximize the revenue of the energy storage system in the whole cycle.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
Calculation Method for Capacitor Parallel Compensation in Distribution Network Based on Local Tree
InactiveCN105322553BReduce line loss rateImprove voltage distributionEnergy industryReactive power adjustment/elimination/compensationMaximum efficiencyCapacitor
A calculation method for parallel compensation of distribution network capacitors based on partial trees, which obtains distribution network information, initially calculates the initial compensation scheme for parallel capacitors, judges whether the partial trees need to be divided again, divides the corresponding partial trees, and determines each partial tree separately Compensation point, judge whether the local tree needs to be optimized again, further optimize the compensation point, compare the benefit-to-investment ratio and make a cyclical judgment until the output of each compensation node number and their compensation capacity under the condition of the maximum benefit-to-investment ratio. The invention can provide capacitor parallel compensation location and compensation capacity of radial distribution network, more effectively reduce the line loss rate in the operation process of the distribution network, improve the voltage distribution of the distribution network operation, and achieve the purpose of improving the economic benefits and power supply of the distribution network operation. The role of reliability has high practical value.
Owner:BEIJING XJ ELECTRIC
Double-layer voltage optimization method for low wind speed distributed wind power integrated into distribution network
ActiveCN109149593BImprove voltage distributionFlexible AC transmissionReactive power adjustment/elimination/compensationControl engineeringVoltage optimisation
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
A distributed photovoltaic cluster voltage double-layer optimal droop control method
ActiveCN107910891BReduce risk of going offlineImprove voltage distributionSingle network parallel feeding arrangementsForecastingBilevel optimizationElectric power system
The invention provides a voltage bilevel optimization droop control method for a distributed photovoltaic cluster, which belongs to the technical field of power system operation and control. The method includes steps of: establishing a distributed photovoltaic cluster droop curve optimization layer and a distributed photovoltaic local reactive power control layer respectively, two levels executingsimultaneously and separately, and the distributed photovoltaic cluster droop curve optimization layer periodically sending the optimization result to the distributed photovoltaic local reactive power control layer to enable the latter to adjust the reactive power output in real time according to the fluctuation of the system state, respond to the system's reactive power regulation requirements to the greatest extent, solve the contradiction between optimization calculation, cycle communication and real-time control, and reduce the photovoltaic off-net risk. The method fully utilizes the reactive power adjustment capability of distributed photovoltaic power generation nodes, reduces the calculation burden of the system, and reduces the operation and maintenance cost.
Owner:STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
Longitudinally and transversely arranged gridding alternating current and direct current hybrid power distribution network and control method and maintenance method thereof
ActiveCN113141028AImproved voltage distribution and load carrying capacityImprove the quality of power supplyElectrical apparatusDistributed generationLoad following power plant
The invention discloses a longitudinally and transversely arranged gridding alternating current and direct current hybrid power distribution network, which comprises a transversely arranged AC line and a longitudinally arranged DC line, a transverter is arranged at a cross point needing AC / DC power exchange, the AC line is connected with a power transmission network power supply and an AC load, and the DC line is connected with a distributed power generation power supply and a DC load. The AC line and the DC line are both provided with a plurality of circuit breakers, and the connection branch between each converter and the AC line and the connection branch between each converter and the DC line are also provided with circuit breakers. Voltage distribution and load bearing capacity of an original alternating-current line are effectively improved, power supply quality is improved, power supply corridor configuration is flexible, and the problem of shortage of power supply corridors during capacity increasing of a current power distribution network is effectively relieved; a conversion link required during grid-connected operation of the load, the distributed power supply and the energy storage equipment is simplified, the utilization rate is increased, and the overall energy efficiency of the system is improved; the power supply reliability is very high; and the expandability is good.
Owner:国网江苏省电力有限公司淮安供电分公司 +1
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