96results about How to "Raise the voltage level" patented technology

In a semiconductor device, an internally-generated power supply voltage VPP is monitored. If the internally-generated power supply voltage VPP is lower than a lower limit voltage, serial refresh is selected as a double refresh operation mode. In the serial refresh, double refresh for a pair address is inserted in a next refresh cycle. By the serial refresh, decrease of the internally-generated power supply voltage VPP is suppressed.

A dynamic reconstruction method considering distributed power supply and soft switch access for a power distribution network comprises the steps of building a source-load stochastic model, and performing stochastic power flow analysis on the power distribution network, wherein source-load stochastic model comprises a wind power generation system stochastic model, a solar photovoltaic power generation system stochastic model and a load stochastic model, and the stochastic power flow analysis of the power distribution network is based on a cumulant method; building an intelligent soft switch running model and a dynamic network reconstruction model, wherein the intelligent soft switch running model is expressed by capacity constraint of an intelligent soft switch converter, and the dynamic network reconstruction mathematical model comprises a target function and a constraint condition; and solving the built models by employing a genetic algorithm. The network reconstruction problem of thepower distribution network containing a distributed power supply and an intelligent soft switch is solved, a load among feeders of the power distribution network is balanced, the integral power flowdistribution of the system is improved, the overload is eliminated, the voltage level is improved, the electric energy quality and the power supply reliability are improved, the network loss is effectively reduced, and the running economy of the power distribution network is improved.

The invention relates to a distributed photovoltaic-energy storage system (PV-BES) output optimization and capacity allocation method counting power loss. The method is characterized in that on the basis of analyzing the power loss of a distribution network comprising the distributed photovoltaic-energy storage system, a PV-BES output optimization model integrating active and reactive power loss with a power loss change rate as a criterion is built, output of the PV-BES system is optimized under different load levels of the distribution network, and on the basis, the photovoltaic-energy storage system capacity is allocated. The calculation result shows that the method can obviously reduce the distribution network loss and improve the node voltage level, a voltage over-limit node is attributed to a safety operation range, and important reference is provided for operation and planning of energy storage-containing distributed photovoltaic system.

The invention relates to a reactive power compensation method and a reactive power compensation system for a micro power grid. The system comprises a distributed measuring unit, a reactive power compensation control unit, a reactive power compensation unit and a communication unit. The micro power grid comprises a distributed power supply with reactive regulation output. For the micro power grid operated in an isolated network mode, the overall reactive power balance condition of the micro power grid is obtained by measuring the active and reactive power distribution conditions of each branchcircuit of the micro power grid, and a reactive power compensation device or the reactive power compensation device and the distributed power supply are subjected to reactive regulation in the micro power grid according to a specific isolated network reactive control strategy to realize the reactive power compensation of the micro power grid. The power factor of the micro power grid can be measured and corresponding reactive power compensation is performed according to the power factor when the micro power grid is operated in a grid-connected mode and in the isolated network mode.

The invention discloses a photovoltaic power storage distributed power generation alternating current traction power supply system and method. Anexistingout-phase power supply traction power supply system partition station is used foraccessing a photovoltaic power generation and storage system to the tail ends of traction networks of the left side and right side power supply partitions, bilateralpower supply is realized in each independent power supply partition through the distributed photovoltaic power generation and storage system, and double-end power source bilateral power supply of a traction power substation and a partition station photovoltaic power generation and storage systemis formed. According to the photovoltaic power storage distributed power generation alternating currenttraction power supply system and method,when the traction network is normal, the bilateral power supply of the traction power substation and the partition station photovoltaic power storage is enabledin the independent power supply partition, when the traction power substation malfunctions, cross-regional power supply by multiple power sources is realized by the adjacent traction substation and the partition station photovoltaic power storage, the voltage level of the traction network is improved, the power supply capacity is improved, and power is uninterruptedlysupplied for electric locomotives or electric motor train units; and at the same time power storage recycles locomotive regenerative feedback energy, the problem of high voltage level at the head end of the traction network caused by foldbackis avoided, and the stability and reliability of traction power supply is improved.

The invention discloses a distributed power source optimal configuration method which includes the following steps: (1) determining types of nodes in a system, numbering the nodes according to the types, considering the nodes with the serial numbers from 1 to q as the PQ nodes, considering serial numbers from q+1 to n-1 as the PV nodes, considering the node with the serial number n as the balanced node, enabling the q to serve as the number of the PQ nodes, and enabling the n to serve as the total number of the nodes in the system, (2) building an optimal configuration model with the system integration load index increment as a maximization target, and (3) solving the optimal configuration model with an interior point method to obtain a distributed power source optimal configuration scheme of the system. According to the distributed power source optimal configuration method, the voltage level of a power distribution network can be effectively improved through optimal configuration on distributed power sources.

The invention discloses a reactive compensation configuration method, in particular relates to an active optimizing method of a generation and transmission grid including probability fluctuation power connection, and belongs to the technical field of reactive optimization of power systems. The method comprises the steps of forming a node admittance matrix in the power system, and setting initial voltage of each node; selecting control variable and state variable; building a reactive optimization change limitation mathematical model which specially includes target functions, portability characteristic limiting conditions and fluctuation characteristics limitation conditions; determining the configuration of the control variable by the stochastic particle swarm optimization based on the latin hypercube probabilistic power flow. With the adoption of the method, a reactive compensation device in the transmission grid can be effectively configured according to the power probability characteristics and fluctuation characteristics of the grid connection of a large-scale photovoltaic station, and therefore, the grid can run normally based on the probability meanings, and moreover, the voltage fluctuation of the photovoltaic power can be greatly reduced, and as a result, the voltage and electricity energy quality of the grid can be increased.

A high speed low powered 4-2 compressor according to the present invention performs an XOR / XNOR operation of input data by using a single input type NAND / NOR logic circuit and a dual input type NAND / NOR logic circuit. Thus, delays to generate complementary signals are avoided. In addition, the 4-2 compressor uses a single railed multiplexer instead of a dual railed multiplexer, so that gate drive nodes and internal load capacitance are reduced. As a result, circuit area and power consumption of the 4-2 compressor are reduced.

The invention discloses a distributed direct-current micro-grid composite energy storage control method. The method comprises super capacitor control and storage battery control. The super capacitor control comprises average voltage control and end voltage consistency control. The average voltage control can make an average bus voltage at a direct current composite energy storage outlet reach a rated voltage so as to enhance an overall voltage level of a system. The end voltage consistency control can maintain end voltages of a super capacitor to be the same and realize equalization output. The storage battery control comprises super capacitor end voltage control and state-of-charge (SoC) control. The super capacitor end voltage control can maintain a super capacitor end voltage level. The SoC control makes output power of a storage battery distributed according to SoC and a single storage battery is prevented from being over-charged and over-discharged. By using the method of the invention, a distributed control problem of composite energy storage is solved. And the method is suitable for a direct-current micro-grid system which is connected in parallel to a multi-composite energy storage system (HESS).

In accordance with at least selected embodiments, new or improved ceramic coated separators, membranes, films, or the like for use in lithium batteries, new or improved batteries including such ceramic coated separators, membranes, films, or the like, and methods of making or using such ceramic coated separators, membranes, films or the like are disclosed. In accordance with at least certain embodiments, new or improved aqueous or water-based polymeric coated separators, membranes, films, or the like are disclosed. In accordance with at least particular embodiments, new or improved aqueous or water-based polyvinylidene fluoride (PVDF) or polyvinylidene difluoride (PVDF) homopolymer or co-polymers of PVDF with hexafluoropropylene (HFP or [-CF(CF3)-CF2-]), chlorotrifluoroethylene (CTFE), vinylidene fluoride (VF2-HFP), tetrafluoroethylene (TFE), and / or the like, blends and / or mixtures thereof, coated separators, membranes, films or the like, new or improved porous separators for use in lithium batteries, new or improved coating or application methods for applying a coating or ceramic coating to a separator for use in a lithium battery, new or improved PVDF or PVDF:HFP films or membranes, and / or the like are disclosed.

The invention is suitable for the field of photovoltaic power generation technology, and provides a distributed photovoltaic power generating grid-connecting planning method and terminal equipment. The method comprises the steps of establishing a photovoltaic probability model and a load probability model; calculating an initial time sequence sample of each preset time period according to median Latin hypercube sampling, the photovoltaic probability model and the load probability model; calculating power distribution network node voltage probability distribution according to a multiple-integration approximation method, a Gram-Charlier grade number, a probability trend equation and the initial time sequence sample; and establishing a photovoltaic grid-connecting opportunity restraining planning model according to the power distribution network node voltage probability distribution. The distributed photovoltaic power generating grid-connecting planning method and the terminal equipment have advantages of improving distributed photovoltaic permeability, reducing integrated economic cost in a long-term planning process of the power distribution network, and improving voltage level in ashort-period operation process of the power distribution network.

The invention discloses a continuous tide calculation method based on a wind power fluctuation rule. The continuous tide calculation method comprises the following steps of: analyzing an active power fluctuation characteristic of a wind power field by adopting an analytical method in the poisson process, and constructing a probability model; determining a time interval of wind power outlet fluctuation and the output variation situation of the power of the wind power field according to the probability model and a statistical result of the wind power variation, thus obtaining the fluctuation rule of the wind power output; performing continuous tide calculation within the same time interval according to the fluctuation rule, thus obtaining a state variable value; and analyzing the state variable value, analyzing the influence of access of large-scale wind photoelectricity on the tide, thus obtaining the influence of wind power on the tide. According to the continuous tide calculation method based on the wind power fluctuation rule, advantages of wind power fluctuation compatibility and high calculation speed are realized; and due to application of actual power grid data, the correctness and the practicability are proved.

A frequency comparator is disclosed in the present invention, for comparing frequency of a first signal and a second signal. The comparator comprises: a frequency detecting circuit for generating reference signal according to the first signal and input voltage; a frequency generator for generating the second signal according to the input voltage; a charge pump coupling at frequency detecting circuit and the frequency generator, for enabling charging current so as to promote voltage level according to one signal of the reference signal and the second signal, and or enabling charging current so as to diminish voltage level according to the other signal of the reference signal and the second signal; and a judging logic device coupling at the charge pump circuit, for determining the relationship between frequencies of the first signal and the second signal according to the voltage level.

The invention discloses a method for optimizing configuration of an intermittent distribution type power supply based on complementary. A target function of optimal configuration of the intermittent distribution type power supply based on the complementary is as follows: FORMULA1 (specifically being shown in the original PDF file), wherein FORMULA2 (specifically being shown in the original PDF file) is an electricity-sale gain expected value of a distributive power supply; FORMULA3 (specifically being shown in the original PDF file) is a saved grid loss cost expected value; FORMULA4 (specifically being shown in the original PDF file) is a waste exhaust gain expected value; CDG is investment cost of the distributive power supply; FORMULA5 (specifically being shown in the original PDF file) is a voltage improvement index expected value; and delta is a measurement factor for converting a voltage improvement index into comprehensive benefit. The method for optimizing the configuration of the intermittent distribution type power supply based on the complementary, disclosed by the invention, has the advantages of being capable of improving voltage level of a system, reducing grid loss, and improving utilization ratio of a renewable energy source.

The invention discloses a unified power flow control system and method for urban rail transit photovoltaic energy-storage traction power supply. The system comprises a power adjustable device and a power adjustable device in a DC traction power supply network of an urban rail transit traction power supply system with photovoltaic energy storage power supply, power-adjustable device controller of each traction power substation participating into primary adjusting, a unified power flow controller participating into the secondary adjusting, an economic scheduling plan controller participating into the third adjusting, a traction power substation comprehensive automatic subsystem, a central comprehensive monitoring system, and a communication network. The adjusting on the traction power substation DC bus voltage by the local controller is realized, the optimal power flow distribution of the DC traction network is realized so that the traction network is minimum in power loss and minimum involtage fluctuation, the traction network voltage level is improved, so that the train current at each place can be provided by traction power substations at two sides as much as possible; the economic scheduling plan can determine the power output plans of the adjustable power devices at different time slots, and the pre-charging / discharging plane of the energy-storage device, and the photovoltaic energy storage can be efficiently utilized.

The invention provides an optical touch control display panel which comprises a plurality of reset signal lines, a plurality of scanning signal lines and a plurality of optical sensing touch control units. Each optical sensing touch control unit includes an optical sensing element and a storage capacitor. The optical sensing element includes a control end, an input end and a control end, and is used for outputting a sensing signal via an output end to the storage capacitor. The control ends of the optical sensing elements along a first direction are respectively connected to the different scanning signal lines and are used for receiving a control signal. The optical sensing elements along a second direction are divided into a plurality of groups, wherein the input ends of the optical sensing elements of each group are respectively connected to the different reset signal lines so that a reset signal is received by each group. Each optical sensing element outputs, based on the control signal, a charging signal corresponding to the reset signal to the storage capacitor so that voltages of the storage capacitor is reset.

The invention discloses a system and a method for two-level distribution network coordination control based on load forecasting. The system comprises gateways, a first-level control module and a second-level control module. The design core of the method of the invention is as follows: a medium and low-voltage distribution network proposes a reactive power regulation range constraint to a high-voltage distribution network, the high-voltage distribution network proposes a voltage regulation range constraint to the medium and low-voltage distribution network, and both networks consider the constraints proposed by each other in optimization calculation, which not only embodies the voltage regulation capability of the high-voltage distribution network to the medium and low-voltage distribution network, but also embodies the reactive power compensation capability of the medium and low-voltage distribution network to the high-voltage distribution network. By adopting the system and the method of the invention, coordinated optimization control on the high-voltage distribution network and the medium and low-voltage distribution network is realized, and overall optimal voltage and reactive power control in the global range is realized, thereby reducing the network loss effectively and improving the voltage level of the distribution networks.

The invention discloses an HELM-based method for calculating the sensitivity of the voltage of a power distribution network to the transformation ratio of a transformer. According to the method, the HELM is used for calculating the power flow of the power distribution network; and the sensitivity of the voltage of a node to the injection power of the node is calculated according to an HELM-based sensitivity calculation method; and the sensitivity of the voltage of the node to the transformation ratio of the transformer is calculated according to the voltage sensitivity calculated based on theHELM. The HELM method is utilized, so that the nonlinear factor of sensitivity is considered, and therefore, a better transformer transformation ratio adjusting scheme can be selected, and the voltagedistribution of the power distribution network is improved.

The invention relates to a control method for a wind power, thermal power and capacitor coordinated wind and thermal bundling system after direct current block. The control method for the wind power, thermal power and capacitor coordinated wind and thermal bundling system after direct current block is characterized by comprising the following steps: initializing parameters at first, and switching off thermal power units one by one in a switch-off range until the system is stable or the thermal power units are switched off completely; if the system is stable, then remaining a thermal power unit, and switching off wind power units one by one until the system is stable; if the thermal power units are switched off completely, switching off the wind power units one by one until the system is stable or the wind power units are switched off completely; switching off a capacitor, switching off the thermal power units and the wind power units in the switch-off range until the system is stable or the wind power units and the thermal power units are switched off completely, recording optimal switch-off amount delta Pi of the wind power units and the thermal power units when recording different capacitor switch-off numbers until the capacitors are switched off completely; and taking a minimum amount of delta Pi as an optimal switch-off amount by comparison, and outputting the switch-off scheme at the time as an optimal control scheme. By coordination of wind power, thermal power and the capacitors, the switch-off amount of wind power and thermal power is reduced effectively, and the method can be widely applied to emergency control after direct current block of the wind and thermal bundling system.

The invention relates to a method for establishing a cluster division double-layer model in combination with network reconstruction. The method comprises the steps of S1 acquiring power distribution network data, establishing a first-layer model, acquiring a time period division mode and calculating first-layer fitness f1; S2 dynamically reconstructing each divided time period based on a random spanning tree reconstruction method according to the time period division obtained in the step S1; S3 establishing a second-layer model according to the network topology of different time periods and the load characteristics of each moment obtained in the S2, obtaining an optimal cluster division result, and recording the corresponding optimal fitness f2max; and S4 returning to the first-layer model, updating the first-layer fitness according to the second-layer model fitness obtained in the S3, realizing the whole process through a double-layer nested genetic algorithm, and simultaneously obtaining an optimal dynamic reconstruction strategy and a cluster division scheme through repeated crossover variation and double-layer optimization. The established model can simultaneously obtain the optimal reconstruction strategy and cluster division mode in a research time period, and a basis is provided for realizing optimal planning or operation scheduling of a power system.

The invention relates to a method for balancing single-phase load of electrified railways and improving power quality of electrified railways. The method adopts two sets of static var generators SVG 1 and SVG 2 which have identical structures and are respectively connected with a left bridge arm and a right bridge arm on a low-voltage side; moreover, capacitors on the direct current sides of the SVG 1 and the SVG 2 are connected in parallel to form a whole. Compared with the prior art, the method has the following advantages: (1) compensating negative sequence current to reduce power grid pollution caused by negative sequence current; (2) reducing bus voltage loss to improve power grid voltage level; (3) compensating reactive power to improve power factor; and (4) compensating harmonic current to reduce power grid pollution caused by harmonic current.

The invention discloses a wind power plant reactive power optimization configuration method based on double-fed induction fan reactive power generating capacity. The wind power plant reactive power optimization configuration method is characterized by comprising the steps such as quantitative calculation, a single wind power plant reactive power optimization configuration model and wind power plant reactive power optimization configuration, based on the double-fed induction fan reactive power generating capacity, obtaining a minimum reactive power output optimization result, meeting an objective function, of each unit, configuring a wind electric motor set power factor and an access point capacitive reactive compensation equipment configuration reference value, taking the actual wind speed of a region to conduct production simulation and detect feasibility of a configuration scheme, and obtaining an inductive reactive power configuration capacity reference value. The wind power plant reactive power optimization configuration method has the advantages of being simple in calculation, reasonable in result, easy to achieve, high in application value and the like. Large-scale reconstruction is not required to be carried out on an existing wind power plant, and on the premise that an existing fan control strategy is not changed, optimization of reactive power configuration of a double-fed induction fan wind power plant is achieved.

A method for optimizing the operation of a distribution network jointly connected with an soft normally open point (SNOP)and an energy storage device, comprises the following steps of: a, establishinga distribution network model jointly connected to the SNOP and the energy storage device by using back-to-back VSCs and a battery; b, establishing a distribution network daily dynamic optimization model based on the SNOP and the energy storage device; c, solving the optimization model by using a genetic algorithm to obtain control reference values including the active power PI flowing through the VSC on a feeder line I side, the active power PJ flowing through the VSC on a feeder line J side, the reactive power QI of the VSC on the feeder line I side, and the reactive power QJ of the VSC onthe feeder line J side, and giving a two-step correction strategy to improve the service life of the energy storage device and the absorption level of uncontrollable distributed power supply. The method combines the SNOP and the energy storage device to form a highly integrated intelligent distribution network comprehensive regulation and optimization device, further strengthens the scheduling control capability of the SNOP, provides the SNOP with a power transmission function and an energy storage function, can suppress fluctuations caused by new energy connection and improves the absorptioncapacity of distributed power source.

The invention discloses an energy storage system-distributed power supply-capacitor integrated control reactive power optimization method. Establishing an objective function, performing constant volume and location calculation according to a preset algorithm; obtaining a candidate solution of a preset function, optimizing the first optimal solution, mining a second optimal solution, determining atarget ideal point of the current optimization problem and an Euclidean distance square from each second optimal solution to the ideal point according to an optimal Pareto leading edge obtained by a multi-strategy fusion particle swarm optimization algorithm, and obtaining a decision compromise solution. According to the invention, multiple elements are combined to optimize the power quality, theabsorption capability of the power distribution network for the distributed power supply is improved, the reactive power distribution and voltage level of the system are improved, and the network lossis reduced; according to the method, a multi-strategy fusion particle swarm optimization algorithm is introduced to execute thorough search on individuals falling into local optimum, the global search capability and the local search capability are high, the local particle jumping-out capability is high, and the probability that the population falls into premature convergence is greatly reduced.

The invention discloses a reactive voltage coordination control method based on a flexible multi-state switch (FMSS). Aiming at a selected power distribution system, the minimum index weight coefficient of the sum of all node voltage deviations and the minimum index weight coefficient of power losses are determined according to different control targets; the reactive voltage coordination control objective function of a power distribution system feeder line group is built according to the weight coefficients; constraint conditions of the power flow constraint, the control variable constraint and the security constraint are built, and a feeder line group reactive voltage coordination control optimization model constituted by the objective function and all the constraint conditions and basedon the FMSS is obtained; and aiming at the optimization model, solving is carried out to obtain the objective function value, reactive compensation quantities of all ports of the FMSS and all the nodevoltages of the power distribution system so as to achieve reactive voltage coordination control. The power distribution network feeder line group serves as a whole for voltage management, reactive output of the feeder line group is coordinated, and the voltage level of a whole regional power distribution network is effectively improved.

The invention discloses a modular multi-terminal flexible DC micro-grid network, which comprises a DC bus, a controllable module, an uncontrollable module and a large grid of a multi-terminal flexibleDC micro-grid. The controllable module comprises one or more controllable distributed power sources, a battery energy storage system, a DC load and an AC load, wherein each controllable distributed power source is incorporated into the DC bus through a distributed power source grid connection device, the battery energy storage system is connected to the DC bus through a stored energy grid connection device, the DC load is directly connected with the DC bus, and the AC load is connected with the DC bus through an AC load grid connection device. The control objective is simplified as the bus voltage control of the DC micro-grid, and thus, the control mode can be selected easily. The micro-grid is modularized and changed from a previous 'designed micro-grid' into an 'assembled micro-grid', and the DC micro-grid is divided into multiple controllable modules and uncontrollable modules, which can save the construction cost of the micro-grid, reduce the floor area and facilitate the subsequent expansion of the micro-grid.

The invention discloses a reactive comprehensive cost model of a generator set. A reactive comprehensive cost function of a generator set is shown as follows: CGqi=Cq+Copp+Closs, wherein the CGqi expresses a reactive comprehensive cost function of a generator, the Cq expresses a reactive capacity cost of the generator, the Copp expresses a reactive opportunity cost of the generator belonging to the reactive electricity cost of the generator, and the Closs expresses a reactive loss cost of the generator, which belongs to the reactive electricity cost of the generator. A reasonable electricity price mechanism is established; with the correct price signal, the transmission field becomes convenient and the economic benefits are increased; and on the basis of reasonable reactive cost and price information, the user of the grid network can make a wise decision. Because of the reasonable reactive distribution, active network loses are reduced; and thus when the reactive power source in the grid carries out reactive balancing well, the system operation efficiency and reliability are improved. And the system voltage level is improved and a problem caused by too high voltage or too low voltage can be solved.

The invention discloses a fiber channel-based hot standby line power-side control standby power supply switching method. A C station is applied to a 110kV inner bridge primary main line of a 110kV substation, or a 110kV single bus line section primary main line of the 110kV substation. The problems of substation capacitive over high reactive power and power grid reactive power inverse transmissioncan be solved, the voltage level of the substation is improved, local power grid voltage can be prevented from being over high, and the overall operation level of the power grid is enhanced. The equipment loss and the insulation aging are reduced, the operating efficiency of the substation main equipment is improved, the substation power factor is improved, and the economical operation of the power grid is improved. The occurrence of large-scale power outage accidents when the main supply line is permanently faulty is effectively avoided, self-healing of the power grid is realized, and the power supply reliability is improved. The method disclosed in the invention can be used as a technical guarantee for the special operation mode of the power grid, thereby greatly improving the safety risk management and control under the special operation mode and promoting the safe and stable operation of the power grid.

The invention relates to a multi-target dynamic robust reconstruction method for a power distribution network containing low-wind-speed distributed wind power. The method comprises the steps of obtaining probability characteristic parameters of a power distribution network connection state and a power distribution network load; forming a plurality of power distribution network reconstruction schemes, and constructing an initial population; obtaining expected values of power distribution network loss and three-phase current unbalance degree; respectively solving eight-order semi-invariants of low-wind-speed distributed wind power active output, reactive output, photovoltaic output and load, and obtaining out-of-limit probability of a node voltage and out-of-limit probability of a branch power flow; judging whether the network topology structure meets radial constraints or not; solving a power distribution network reconstruction problem, and continuously iterating to obtain an optimal population so as to obtain an optimal dynamic reconstruction scheme; and applying the optimal dynamic reconstruction scheme to a target power distribution network, and controlling the on-off of an interconnection switch according to the optimal dynamic reconstruction scheme. The method not only can adapt to the operation condition of the power distribution network, but also can adapt to different wind speeds and illumination environments, and facilitates the high-permeability access of new energy to the power distribution network.