28 results about "Automatic voltage control" patented technology

The application relates to the technical field of automatic voltage control of power systems, and discloses a wind power grid-connected regional power grid AVC cooperative control method and system. The method constructs a three-layer dynamic logic architecture: a regional power grid AVC master station layer, a wind power plant cluster logic coordination layer, and a single plant station on-site execution layer. The master station layer constructs a comprehensive coupling degree index based on voltage sensitivity and electrical distance, performs adaptive dynamic partitioning, and generates a corresponding logic coordination unit for each partition; the master station layer periodically solves a multi-objective reactive power optimization model and issues a total reactive power instruction to each partition; the logic coordination unit finely allocates the adjustment amount according to the voltage regulation sensitivity, reactive power margin and response characteristics of each reactive power source; and the on-site execution layer executes the instruction. The application realizes linkage reconstruction of dynamic partitioning and logic coordination units, solves the problems of severe voltage fluctuation and difficult multi-resource coordination under wind power grid connection, and improves voltage stability, economy and equipment operation life.

The application belongs to the technical field of automatic voltage control, and discloses a dynamic voltage regulation system and method of an intelligent voltage converter, which comprises the following steps: acquiring a load current instantaneous value, an output voltage instantaneous value and a switching frequency of a power switching device, and determining a load mutation characteristic parameter; acquiring a voltage regulation priority factor according to the load mutation characteristic parameter and the output voltage instantaneous value; performing hierarchical adjustment on the switching frequency of the power switching device based on the voltage regulation priority factor, and obtaining a dynamic switching frequency; determining a duty cycle adjustment step according to the dynamic switching frequency and the load current instantaneous value; acquiring a duty cycle correction value based on a deviation amplitude of the duty cycle adjustment step and the output voltage instantaneous value; and controlling the switching action of the power switching device according to the dynamic switching frequency and the duty cycle correction value.

The invention discloses an energy storage system power distribution method and system of a grid-connected point, a medium and equipment, and belongs to the technical field of automatic voltage control of a power system, and the method comprises the steps: monitoring the per unit value of the voltage of the grid-connected point and the charge state of an energy storage system in real time; according to a preset voltage threshold value and a charge state threshold value, dividing the grid-connected point voltage per unit value and the charge state of the energy storage system to obtain a plurality of operation condition intervals; for different operation condition intervals, dynamically selecting a preset target function and a corresponding constraint condition combination, and based on the selected target function combination and the constraint condition combination, carrying out iterative calculation to obtain a power adjustment amount of the energy storage system; and controlling the energy storage system to execute power distribution according to the power adjustment amount. Therefore, by implementing the method, the problems of low voltage treatment efficiency and easy overcharge / overdischarge of the energy storage system due to the fact that the difference between the per unit value of the grid-connected point voltage and the energy storage charge state is not comprehensively considered in the prior art can be solved.

This invention discloses a power grid risk early warning method based on digital twins, belonging to the field of power grid risk early warning technology. The method includes: firstly, integrating data from the power grid energy management system, production management system, and information security system to construct a digital twin base for the primary system physical model, the secondary system mechanism model, and associated operating modes; then, considering the virtual automatic voltage control constraint calculation baseline situation; subsequently, injecting hypothetical equipment faults, and linking the execution of electromechanical transient analysis, relay protection action prediction, standby automatic transfer action prediction, and power flow recalculation to form a predictive topology; further, combining power source backtracking and dynamic voltage difference calculation at both ends after virtual disconnection of tie switches, identifying single-source risks, risks from the same upstream power source, and risks of double circuits on the same pole. This method achieves unified extrapolation of power grid operating status, secondary device actions, and structural risks, improving the completeness, foresight, and targeted level of risk identification and response.

This invention discloses a voltage control method for multi-level, multi-park virtual power plants considering equivalent impedance estimation, belonging to the field of power system automatic voltage control and distributed energy collaborative optimization technology. The method includes the following steps: Step S1: Acquisition of virtual power plant related information and initial state setting; Step S2: Park information estimation; Step S3: Equivalent impedance estimation and collaborative model construction; Step S4: Determination of three-level control strategy; Step S5: Three-dimensional collaborative control; Step S6: Correction of model accuracy. This invention deeply integrates hierarchical decision-making and equivalent impedance estimation technologies, enabling refined voltage control in dynamic scenarios and ensuring the coordinated, stable, and efficient operation of virtual power plants across multiple voltage levels and parks.

The invention provides an automatic voltage prevention and control method based on voltage fluctuation ratio prediction, and the method comprises the steps: obtaining and correcting the voltage sequence data of a bus in a target region in a past time period at the arrival moment of a current control cycle; fitting an ARIMA model used for predicting a voltage base value and a GARCH model used for analyzing voltage fluctuation characteristics based on the corrected voltage sequence, respectively generating a voltage base value prediction sequence and a voltage fluctuation rate prediction sequence of a future time period, and finally generating a voltage prediction sequence of the future time period. Further obtaining a dynamic voltage safety domain of the current control period; and the security domain is used as a constraint condition to be embedded into an automatic voltage control system so as to realize automatic voltage prevention and control. According to the invention, through fusion of time sequence analysis and volatility modeling technologies, voltage trend and volatility prediction can be fused, a dynamic control threshold value is generated accordingly, and accurate prediction and dynamic regulation and control of the power grid voltage are realized.

In an aspect of the present disclosure, an IoT-based automated voltage controller system for motor-operated three-phase autotransformer is disclosed and a method thereof. The controller system includes a single-phase bidirectional synchronous motor mechanically connected with a shaft of the autotransformer. The motor changes tapping of windings of the autotransformer through dials. A switch mode power supply (SMPS) circuit is configured to supply power to the voltage controller unit, which primarily steps down the voltage to 5V and rectify thereto into DC voltage. An Arduino-nano microcontroller associated with a plurality of modules. The modules are configured such that the output voltage of the motor-operated three-phase autotransformer remains either constant or varies at +4V irrespective of nature of power supply automatically during full load conditions, thereby compensating supply voltage fluctuations.

The application discloses a power plant reactive power voltage control instruction mode evaluation method and system, comprising: obtaining power grid historical operation data of a power plant; inputting the power grid historical operation data into a pre-constructed AVC (Automatic Voltage Control) adjustment performance evaluation model of the power plant to calculate AVC single adjustment performance evaluation indexes of the power plant; obtaining all AVC single adjustment performance evaluation indexes of the power plant in a set evaluation time range, and obtaining AVC total adjustment performance evaluation indexes of the power plant according to a pre-constructed calculation model; and determining a final evaluation result according to a pre-set evaluation index threshold and the AVC total adjustment performance evaluation indexes. Advantages: the method establishes an evaluation index, extracts power grid historical operation data in a period of time, evaluates AVC adjustment performance indexes of each power plant, gives suggestions of AVC control instruction modes of the power plant according to the advantages and disadvantages of the indexes, guides AVC closed-loop control of the power plant, and improves the reactive power voltage control effect.

The invention discloses an automatic voltage control method, system and device for a new energy station and a medium. The method comprises the following steps: acquiring state data and grid-connected point voltage deviation of each reactive power source in the new energy station; when the grid-connected point voltage deviation is greater than a preset voltage threshold value, calculating a reactive compensation demand according to the grid-connected point voltage deviation; based on the state data of each reactive power source, distributing a reactive power compensation demand to each dynamic reactive power source so as to carry out voltage regulation; and after the voltage is stable, optimizing reactive power distribution of the dynamic reactive power source and the static reactive power source by taking maximization of the energy storage reactive power margin as a target. Through the two-stage hierarchical coordination strategy, the voltage stability and the operation efficiency of the new energy station can be improved, and rapid voltage regulation and reactive power resource optimal distribution are realized.

The invention discloses a reactive voltage operation evaluation method and system for a cluster photovoltaic power station, and relates to the technical field of photovoltaic power generation, and the method comprises the steps: calculating a voltage quantitative index based on real-time operation data, and providing a data basis for evaluation; the Kirchhoff's law is used for defining reactive circulation and unbalanced distribution characteristics, and accurate definition and recognition of abnormities are achieved; constructing an equivalent circuit model and revealing topological influence through a sensitivity matrix of load flow calculation; an automatic voltage control mechanism is analyzed, and the root of a regulation problem is revealed; factors such as the electrical distance, the regulation rate and the chain structure power station voltage regulation coupling strength are comprehensively considered, the reactive power output distribution coefficient of each photovoltaic power station is calculated in a weighted mode, and resource coordination is improved; and constructing a quantitative index system based on an abnormal identification and regulation operation mechanism, and carrying out comprehensive state evaluation. The method overcomes the fuzzy limitation of previous description, provides a mathematical physical basis, and supports the scientific decision of operators.

The invention provides a safety anti-misoperation control system and method for an energy storage power station. The system comprises a data acquisition module, a data processing module and a data processing module, wherein the data acquisition module is configured to acquire power operation data of the energy storage power station; the operation condition identification module is configured to identify the operation condition of the energy storage power station based on the power operation data to obtain an operation condition category; the control instruction verification module is configured to perform multi-dimensional verification on control instructions received by the automatic power generation control system and the automatic voltage control system, and judge whether the control instructions are abnormal or not; the anti-misoperation decision-making module is configured to determine emergency active power or emergency reactive power based on local measurement data if the control instruction is abnormal, and control the energy storage power station to operate at the emergency active power or the emergency reactive power, so as to solve the problem that when the control instruction of the current automatic power generation control system and the automatic voltage control system is abnormal, the emergency active power or the emergency reactive power cannot be used. And the system cannot perform inspection and cannot automatically provide an emergency scheme for emergency operation of the energy storage power station.

The invention belongs to the technical field of automatic voltage control of a power grid, and particularly relates to a method for a static synchronous phase modifier of a wind power plant to participate in AVC control. The method comprises the steps that when each control cycle arrives, a wind power plant AVC substation firstly eliminates voltage out-of-limit and completes voltage regulation; then, reactive calculation iteration values of reactive equipment including the static synchronous phase modifier are calculated; judging whether the reactive power sent by the reactive power equipment is in a capacitive interval or an inductive interval, and adjusting a reactive power calculation iteration value of the static synchronous phase modifier through secondary distribution of the reactive power so as to obtain a corresponding reactive power set value; and the AVC substation issues a corresponding control mode, an outlet voltage set value, a reactive power set value and voltage upper and lower limit set values to the static synchronous phase modifier. According to the invention, anchoring of reactive voltage operation points of the static synchronous phase modifier is realized through reactive secondary distribution, ring current of each reactive device is avoided or reduced, and automatic switching of a voltage source control mode and a reactive source control mode of the static synchronous phase modifier is realized.

The invention relates to the technical field of power system operation and control, and discloses a voltage control system adaptive control method, system, equipment and medium based on risk quantitative perception, and the method comprises the steps: deeply mining historical operation data and meteorological information through an artificial intelligence technology, constructing an online risk quantitative model, and outputting a dynamic risk factor; a dynamic mapping mechanism between a risk factor and an automatic voltage control optimization target is established, a safety weight and an economic weight in the control target are designed as an adaptive function of the risk factor, a risk adaptive strategy is embedded into a model prediction control rolling optimization framework, and a closed-loop control system is formed. According to the method, the voltage out-of-limit risk in an extreme scene can be remarkably reduced, meanwhile, the network loss is effectively reduced in conventional operation, and an innovative solution is provided for safe and economical operation of a high-uncertainty power grid.

This invention belongs to the field of automatic voltage control technology for power grids, and specifically relates to a method and electronic equipment for rapid coordinated control of reactive power equipment in wind farms. This invention employs a scheme for rapid coordinated control of reactive power equipment in wind farms with a variable control cycle to overcome the shortcomings of existing fixed-cycle control. It significantly accelerates the overall adjustment speed of reactive power voltage. Through a "small step, multiple rounds" adjustment method, voltage regulation becomes more stable and reliable. Triggered control by scanning key variables shortens the response time of the wind farm AVC substation, quickly suppressing voltage fluctuations exceeding limits. Active identification of reactive power equipment responses quickly detects equipment with abnormal responses, facilitating timely problem identification and resolution by operators. These measures improve the overall pass rate of wind farm AVC regulation, helping to reduce or avoid assessment costs.

The invention provides a power plant automatic voltage control (AVC) system distribution method and device based on equal-margin same-direction distribution, and the method comprises the steps: predicting the reactive power output and error of each device through extended Kalman filtering, and calculating a dynamic safety margin; according to bus voltage deviation, reactive power is preliminarily distributed according to an equal-margin same-direction principle; a multi-target quadratic programming model with the equipment life, the system loss and the voltage stability as targets is constructed, and the optimal reactive increment is solved; real-time optimization is carried out in a rolling time domain through model prediction control, and an instruction is issued; the weight coefficient is adaptively adjusted according to the equipment health score and the real-time electricity price, and safe, economical and efficient voltage control is realized. The reactive power regulation precision and the response speed of the AVC system of the power plant can be improved, the safety and the economical efficiency of equipment operation are enhanced, and the voltage stability and the capacity of adapting to complex working conditions of the system are improved.

The invention provides a reactive voltage coordination control method for a flexible DC converter station, and belongs to the field of automatic voltage control of a power system. The method comprises the following steps: taking a converter stage of an AC / DC coupling transformer of the flexible DC converter station as an equivalent generator, and establishing a control model of an AVC secondary control zone corresponding to a 500kV flexible DC converter station area; when each control cycle arrives, if the bus voltage at the high-voltage side of the flexible DC converter station is out of limit, constructing a quadratic programming optimization model for eliminating the out-of-limit of the bus voltage of the flexible DC converter station, and eliminating the out-of-limit by utilizing reactive power resources of the flexible DC converter station; and if the voltage of the high-voltage side bus of the flexible DC converter station does not exceed the limit, constructing a quadratic programming optimization model of the voltage of the pilot bus in the flexible DC converter station region, and realizing reactive voltage coordination control by using reactive resources of the flexible DC converter station and the near-region plant station. According to the method, the regional bus voltage qualification rate of the flexible DC converter station and the reactive spinning reserve and voltage stability margin of the flexible DC converter station can be effectively improved, and the regional voltage stability is improved.

This invention relates to the field of automatic voltage control technology in power systems, and discloses a regional power grid AVC collaborative control method and system for wind power grid connection. The method constructs a three-layer dynamic logic architecture: a regional power grid AVC master station layer, a wind farm cluster logic coordination layer, and a single-site local execution layer. The master station layer constructs a comprehensive coupling index based on voltage sensitivity and electrical distance, performs adaptive dynamic partitioning, and generates a corresponding logic coordination unit for each partition. The master station layer periodically solves a multi-objective reactive power optimization model and issues a total reactive power command to each partition. The logic coordination unit finely allocates the adjustment amount according to the voltage regulation sensitivity, reactive power margin, and response characteristics of each reactive power source. The local execution layer executes the commands. This invention achieves the linkage and reconstruction of dynamic partitioning and logic coordination units, solving the problems of severe voltage fluctuations and difficulties in multi-resource coordination under wind power grid connection, and improving voltage stability, economy, and equipment lifespan.

The invention relates to the technical field of power systems, and discloses a simulation method and device for an oscillation risk of an automatic voltage control system. Comprising the steps that BPA models of N wind power plants are established, a first DAT file is acquired, and the first DAT file comprises network parameters of the BPA models; respectively modifying the active output values of the N wind power plants in the first DAT file to obtain a second DTA file; performing load flow calculation based on the second DTA file to generate a first PFO file; modifying the reactive power of the N wind power plants in the second DTA file based on each node voltage of the wind power centralized access area in the first PFO file, and generating a third DTA file; executing load flow calculation based on the third DTA file to obtain a second PFO file; and determining the oscillation risk of the voltage control system based on the second PFO file. According to the invention, the dynamic behavior of the AVC system can be simulated on the continuous time scale, and the change of the system in actual operation can be reflected more truly.

The application discloses an automatic voltage control method and device and a nonvolatile storage medium. The method comprises the following steps: obtaining a plurality of active power prediction values of a target transformer substation at a plurality of time points; determining a target time period according to the plurality of active power prediction values; obtaining a target voltage value of the target transformer substation at a target time point, wherein the target time point is located in the target time period, and the target voltage value represents a high-voltage side bus voltage of the target transformer substation; and generating a voltage control scheme according to the plurality of active power prediction values and the target voltage value, wherein the voltage control scheme is used for controlling the reactive power of the target transformer substation to keep balance. The application solves the technical problem that the power grid operates in a non-safe and stable state due to the fact that the traditional voltage control method cannot quickly adjust the voltage to a reasonable range.

The invention provides a new energy power grid automatic voltage control partition dynamic generation method, and belongs to the technical field of power system automatic voltage control. The method comprises the following steps: when each control cycle arrives, generating an initial control partition of the current control cycle through power grid topology analysis; combining the initial control partitions with the hierarchical relationship to generate a final control partition of the current control period; and screening partitions participating in new energy voltage control of the current control period from the final control partitions. According to the method, the power grid topological structure is identified on line, the control subarea with the new energy station as the core is dynamically constructed, and the method can adapt to the change of the power grid operation mode, so that the precision and robustness of the automatic voltage control system are improved. The method can effectively improve the real-time performance and adaptability of automatic voltage control, and is especially suitable for a large-scale new energy grid-connected scene.

The invention discloses a power system ultra-short-term transient stability risk rapid assessment method and system, and the method comprises the steps: determining a clustered anticipated fault subset according to the latest assessment result of the transient stability margin and the source load influence degree under an anticipated fault; determining a key anticipated fault of each subset according to the transient stability margin; according to the random source charge ultra-short-term confidence interval and the transient stability influence degree, random source charge ultra-short-term active power corresponding to each key anticipated fault is determined, and a system ultra-short-term risk operation state corresponding to each key anticipated fault is generated in combination with an ultra-short-term plan operation state and an automatic power generation control / automatic voltage control strategy; and determining the ultra-short-term transient stability risk of the power system through transient stability evaluation of the key anticipated fault in the state. Meanwhile, the invention discloses a corresponding system. According to the method, the key anticipated fault and the corresponding high-risk operation state in the ultra-short-term time period are identified, so that rapid evaluation of the ultra-short-term transient stability risk in consideration of source load randomness is realized.

The application discloses a kind of virtual oscillator auxiliary wind farm reactive power coordination system and method, for electric power system automatic voltage control technical field, this virtual oscillator auxiliary wind farm reactive power coordination system includes: comprehensive prediction module, multi-objective optimization module, high volatility response module and low volatility management module.The application obtains the active power output data of wind farm in real time, calculates voltage volatility and frequency volatility index, and combines the reactive power demand and voltage stability requirement of power grid, utilizes the reactive power adjustment amount required by multi-objective optimization model dynamic calculation, can determine response priority according to the adjustment capacity of equipment, and formulates the reactive power adjustment task and control strategy of equipment, to ensure that power grid meets reactive power demand while maintaining voltage and frequency stability, improve the operation efficiency and stability of wind farm and power grid, optimize the allocation and management of resources.

The application discloses a kind of river basin cascade chain hydroelectric automatic voltage control coordination regulation method, it is related to voltage regulation technical field.The application accurately solves the problem of reactive power pulling and voltage gradient anomaly of chain hydroelectricity, improves reasonable voltage gradient operation rate, avoids internal reactive power invalid consumption.Through the three-level coordination of "provincial dispatching-collective control-power station", replace traditional independent response mode, greatly improve voltage instruction tracking accuracy and AVC examination compliance rate.Simulation verification and index check, enhance the safety and stability of hydroelectric system, optimize reactive power output distribution to reduce loss, adapt to the characteristics of chain structure.Provide high adaptability control framework for large-scale hydroelectricity grid connection, help clean energy efficient consumption and modern power grid stable operation.

The invention provides a main transformer branch head position evaluation method based on a power supply partition, and belongs to the technical field of automatic voltage control of a power system. According to the method, in each 500kV-220kV power supply subarea of a power grid, 500kV main transformers running in parallel form a main transformer group; based on the voltage information and the reactive information of the main transformer group, reactive flow of the main transformer group and the voltage out-of-limit condition of a bus connected with the main transformer group are obtained, then whether the position of a main transformer branch head in the main transformer group is reasonable or not is evaluated, and the unreasonable position of the main transformer branch head is adjusted. The method can prevent the unreasonable main transformer branch head position from influencing the AVC control effect and even threatening the voltage stability of the power grid, and can obtain the reasonable position of the main transformer branch head in the 500kV-220k power supply partition, so as to meet the requirements of safe and economic operation of the power grid.

The invention discloses a drainage basin cascade chain type hydropower automatic voltage control cooperative regulation method, and relates to the technical field of voltage regulation and control. According to the invention, the problems of reactive pulling and abnormal voltage gradient of the chain type hydropower station are solved accurately, the reasonable voltage gradient operation rate is improved, and internal reactive invalid consumption is avoided. Through three-level cooperation of provincial dispatching, centralized control and power station, a traditional independent response mode is replaced, and the voltage instruction tracking precision and the AVC examination standard-reaching rate are greatly improved. Through simulation verification and index verification, the safety and stability of a hydroelectric system are enhanced, reactive power output distribution is optimized to reduce loss, and the characteristics of a chain type structure are adapted. A high-adaptability control framework is provided for large-scale hydroelectric grid connection, and efficient absorption of clean energy and stable operation of a modern power grid are assisted.

The present application relates to a kind of photovoltaic power station AVC control method based on particle swarm algorithm, belong to new energy power station monitoring automation technical field.The method includes: through photovoltaic power station automatic voltage control AVC system setting main transformer high voltage side bus voltage U pcc_ref With the minimum deviation of photovoltaic power station main transformer high voltage side bus voltage and the minimum station active loss as target, a multi-objective optimization model is established;Using fuzzy theory, the multi-objective model is converted into a single objective model;Particle swarm optimization algorithm is used to solve the single objective model;According to the solution, the corresponding reactive power regulation instructions are issued by the AVC system to each reactive power source.The method of the present application considers the active loss in the station when distributing reactive power in the AVC system of photovoltaic power station, which can effectively reduce the active loss in the station while meeting the AVC voltage control, and provides a strong support for safe and economic operation of power station.

This invention discloses a stability determination method and system for an automatic voltage control closed-loop system in a new energy base. The method includes: acquiring system parameters of the automatic voltage control closed-loop system; establishing a discrete state update model including the current cycle control command and the previous cycle control command; constructing augmented state variables and establishing a unified closed-loop discrete mapping relationship considering control laws and limiting constraints; dividing the state space into an unsaturated subspace and a saturated subspace according to whether the control command touches the limiting constraint, and establishing corresponding piecewise discrete mapping relationships; constructing a linear matrix inequality stability criterion for the unsaturated subspace under the condition that the voltage-reactive power characteristics satisfy the bounded incremental sector, and transforming it into a semi-positive definite programming problem to obtain the stability determination result. This invention can accurately characterize the dynamic behavior of the AVC closed loop in a new energy base under the combined effects of sample-and-hold, time delay, and limiting, and realize the analysis and determination of the system's stability state and oscillation mode.

This invention discloses a reactive power and voltage regulation control strategy with an AVC (Automatic Voltage Control) co-control station. A co-control station is set up at substation / switching station nodes where multiple power plants converge. AVC substations under the co-control station report their remaining adjustable reactive power capacity to the co-control station. Each regular substation or co-control station reports its own or the overall remaining adjustable reactive power capacity of the converged area to the AVC master station. The AVC master station performs secondary voltage control optimization calculations on the power grid in the control area and issues regulation commands to each regular substation and co-control station. Each regular substation and co-control station converts the commands into reactive power regulation quantities. Regular substations adjust their own reactive power capacity. The co-control station calculates the total reactive power regulation demand based on the topology and real-time reactive power output of its subordinate AVC substations. The co-control station calculates and issues reactive power regulation commands to each subordinate AVC substation for this round. Each subordinate substation receives the commands issued by the co-control station and completes the reactive power regulation. This invention bridges the communication gap between the master station and substations, improving the reactive power regulation capability of areas with multiple power plants converged.