61 results about "Automatic voltage control" patented technology

A control method and system for automatic voltage control (AVC) substation reactive power optimization assistance are provided, and belong to the technical field of electric power system operation control. The method includes: determining whether a reactive integrated electric quantity of a main transformer step-down switch of a substation exceeds a set value of reactive integrated electric quantity of the main transformer step-down switch; if yes, determining whether voltage of a 10 kV bus of the substation is qualified; if yes, determining whether a power factor of a transformer step-down switch is greater than a power factor set value of the main transformer step-down switch; if yes, determining whether a reactive power demand of the substation is true; and if yes, putting a capacitor into use to perform reactive on-site balance control.

The application relates to the technical field of automatic voltage control of power systems, and particularly discloses a new energy model splicing method based on CIM for AVC control, which comprises the following specific steps: standardizing the description of wind power and photovoltaic new energy equipment based on CIM; establishing a new energy splicing model to uniformly process the wind power new energy equipment and the photovoltaic new energy equipment; integrating the new energy splicing model with AVC control through a standardized interface; and establishing a closed-loop feedback mechanism between the new energy splicing model and AVC control.

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 invention discloses a hydropower station dynamic grid-connected performance self-evaluation method, system and device and a medium. The method comprises the steps of obtaining real-time operation data of a power grid; analyzing the obtained data, and evaluating the automatic voltage control performance to obtain a first dynamic grid-connected index; evaluating the performance of the excitation and power system stabilizer to obtain a second dynamic grid-connected index; evaluating the automatic power generation control performance to obtain a third dynamic grid-connected index; evaluating the primary frequency modulation performance to obtain a fourth dynamic grid-connected index; and based on the dynamic grid connection index, performing self-evaluation on the assessment index and the compensation index of the power plant, and generating early warning information. The safe and stable operation level of the hydropower station and good interaction with the power grid are improved.

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 belongs to the technical field of voltage control, and particularly relates to an automatic voltage control method based on an EMS and a computer system. Different from the prior art according to the SOC upper and lower limits of the energy storage device in a fixed ideal state, the SOC upper and lower limits of the energy storage device can be dynamically adjusted according to the health state of the energy storage device and / or the power grid load, the service life of the energy storage device can be prolonged, aging equipment is prevented from being in a high SOC state for a long time, and battery attenuation is reduced; the output upper limit is dynamically adjusted according to the power grid state, and the overload risk is prevented; and balance between power grid requirements and equipment health is realized, and the overall operation and maintenance cost is reduced. The technical problem that an existing AVC control method is high in operation and maintenance cost is solved.

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.

The invention discloses a magnetic valve type controllable reactor voltage control method for a wind and light collection system based on automatic voltage control. The method comprises the steps that voltage, current, active power and reactive power parameters of the wind and light collection system are collected in real time through an automatic voltage control AVC system; analyzing voltage level and reactive power distribution based on the acquired parameters, comparing with a preset voltage target value to generate a control strategy to preferentially switch a passive filter bank, switching the filter bank when the voltage is lower than a set value, and switching off part of the filter bank when the voltage is higher than the set value and the power quality is allowed; when the compensation capacity of the filter bank is insufficient, reactive output is dynamically adjusted by adjusting the inductance value of the magnetic valve type controllable reactor; according to the method, real-time monitoring and data acquisition and analysis of the wind and light collection system are realized through an automatic voltage control system, so that the switching of a filter is controlled, the inductance value of a magnetic valve type controllable reactor is accurately regulated and controlled, and the stability of system voltage and the optimization of reactive power are ensured.

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 a hydropower station automatic voltage control and unit reactive PID adjustment method, system and device and a medium, and the method comprises the steps: obtaining a hydropower station bus voltage value, and obtaining a bus voltage adjustment completion or adjustment non-completion signal according to the bus voltage value; a bus voltage regulation completion or non-completion signal and an automatic voltage control input or quit state signal are sent to a unit reactive PID (Proportion Integration Differentiation) module; and based on the bus voltage regulation signal and the automatic voltage control signal, the unit reactive PID module executes closed-loop regulation or open-loop regulation. According to the invention, bus voltage is monitored in real time to obtain a regulation state signal, and the regulation state signal is transmitted to a unit reactive PID module through automatic voltage control; the unit reactive PID module executes closed-loop or open-loop adjustment according to the signal, so that excessive adjustment and oscillation can be avoided, adjustment requirements can be timely responded, reactive power can be accurately adjusted, and the operation stability and efficiency of a power system of a hydropower station can be improved.

The application discloses a new energy gathering area reactive power and voltage control method considering power factors, realizes new energy power grid reactive power and voltage coordinated control considering power factors, in one aspect, through adjusting new energy station unit reactive power output, affecting the mode of the central bus (the bus of the new energy gathering area centralized grid-connected substation) voltage value, to track the voltage optimization target value of the central bus in real time, on the other hand, in the process of preferentially tracking the realization of the central bus voltage optimization target value, the requirements of new energy station power factor balance are considered, the problem of unreasonable reactive power distribution or even circulating current among new energy stations is avoided, and therefore the automatic voltage control level of the new energy power grid is improved.

The invention provides a method for calculating power grid active loss caused by automatic voltage control based on sensitivity, and belongs to the technical field of power system voltage control. The method comprises the following steps: when a current automatic voltage control cycle arrives, obtaining a reactive power equipment set influencing the active power loss of the power grid and calculating the sensitivity of reactive power output of each reactive power equipment in the set to the active power flow loss of the power grid; calculating the active power flow loss of the power grid caused by the reactive power equipment in combination with the reactive power output variable quantity of the reactive power equipment in the current automatic voltage control period; and based on the power grid active power flow loss caused by the reactive equipment, performing integration by adopting a rectangular method to obtain the power grid active power loss caused by the reactive equipment. According to the method, the quantitative calculation result of the active loss of the power grid caused by automatic voltage control after the automatic voltage control system is put into closed-loop operation can be obtained online in real time, and safe and efficient operation of the power grid is facilitated.

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 discloses an anti-misoperation method for automatic voltage control, and the method comprises the following steps: S1, carrying out the reactive equipment classification of a command giving object through a keyword extraction method for an automatic voltage control command; and S2, carrying out association query on the station under the automatic voltage control command and the D5000 system of the point number in the first area of the production control large area, searching the command control point number under the corresponding station, reading the associated equipment information of the corresponding control point number under the station, and according to the difference of the reactive equipment classification condition in the step S1, through a topological connection point number tracing method, determining the reactive equipment classification condition according to the difference of the reactive equipment classification condition. Determining whether the type of the actual voltage automatic control equipment is the same as that of the command issuing equipment, if not, stopping the command, and if yes, continuing to perform the next step; and S3, carrying out secondary identification on the devices which are determined to be of the same type, determining whether the commanding device and the automatic control device belong to the same device through a keyword extraction method, if not, stopping the command, and if so, continuing the command.

The invention provides a parallel computing-based new energy voltage control method, and belongs to the technical field of automatic voltage control of a power system. The method comprises the following steps: when a control cycle arrives, establishing a voltage-controlled quadratic programming model for each new energy gathering area; inputting the quadratic programming model of each new energy gathering area into a parallel computing platform and initiating a computing request, and solving by the parallel computing platform to obtain a reactive power regulation quantity of a new energy station equivalent machine in the new energy gathering area; and the parallel computing platform takes the reactive power regulation quantity as a control instruction and issues the control instruction to AVC substations of the new energy stations in the new energy gathering area, and the AVC substations complete reactive power regulation in the new energy stations. According to the method, on the basis of coordinating the secondary voltage control model, a parallel computing platform is combined to realize simultaneous solving of a plurality of new energy gathering areas, so that the real-time requirement of new energy voltage control is met.

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.

An embodiment of the present invention discloses a method and system for wireless partial discharge sensor sample acquisition. The method includes: collecting partial discharge signals transmitted by a wired UHF partial discharge sensor according to the generated target sample quantity; generating a decimated signal simulating the output signal of a wireless partial discharge sensor by filtering the partial discharge signals, introducing random phase truncation, and decimation; outputting a PRPS map according to the decimated signal, and adding set partial discharge model labels to generate sample data. The method and system save sample acquisition time through an intelligently controlled sample acquisition process, including automatic voltage control, data acquisition, data transmission, and storage, thereby achieving the acquisition of a large number of wireless partial discharge samples and providing a data basis for partial discharge diagnosis algorithms.

The invention relates to the technical field of data analysis, and discloses a power grid operation data panoramic analysis method and system based on a cloud scene digital platform, and the method comprises the steps: obtaining first power grid operation data in real time; inputting the first power grid operation data into a hierarchical algorithm model for first judgment, second judgment and third judgment so as to obtain a capacity-increasing transformation suggestion, an automatic voltage control optimization suggestion and an equipment maintenance suggestion; and constructing a first comprehensive interface, and pushing the data wheel disc type suggestion list so as to realize panoramic analysis of the power grid operation data. According to the invention, automatic real-time acquisition and multi-dimensional mining analysis of data are realized, so that the power grid management efficiency is greatly improved, and the labor cost and time are saved; on the basis of dynamically generated capacity-increasing transformation, AVC optimization and other suggestion lists, decision scientization is promoted, and blind investment is effectively avoided; by means of equipment health degree model prediction and implementation of preventive maintenance measures, the power failure accident rate is successfully reduced, and the power supply reliability is improved.

The invention provides an automatic voltage control method considering an anticipated N-1 off-network fault of a new energy station, and belongs to the technical field of automatic voltage control of a power system. The method comprises the following steps: when a preset calculation period arrives, constructing a coordination control partition model of a new energy gathering area; on the basis of the coordination control partition model, calculating the voltage variation of any new energy station in the partition to other buses in an off-network manner; and on the basis of the voltage variation, according to a calculation model of a voltage safety feasible region, calculating a bus voltage operation limit value of each bus in the partition under the condition of considering all new energy station N-1 off-network faults in the partition, and updating the bus voltage operation limit value to a reactive voltage automatic control system so as to realize automatic voltage control of the new energy station anticipated N-1 off-network faults. According to the invention, the system voltage can meet the requirement of safe operation of the voltage of each new energy station under the normal condition and after any new energy station is offline, and the adjustment target of safe, stable and high-quality voltage 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 discloses an automatic voltage control method and system for a power system, and relates to the technical field of power system automation and control, and the method comprises the steps: training an adaptive AI load prediction model at a cloud end and a local data center based on a power grid state report, and generating a load prediction value; making a voltage regulation plan according to the load prediction result, and executing voltage regulation operation according to the voltage regulation plan; and after the voltage regulation operation is completed, the edge computer equipment records an execution result and feeds back the execution result to the central management to evaluate the effectiveness of the voltage regulation plan. According to the method, the automation level and the intelligent degree of the power grid are improved, the reliability and the economical efficiency of the method are remarkably enhanced, and the method has important practical application value.

The present invention discloses a method for optimizing and controlling the participation of new energy stations in provincial and local coordinated reactive regulation, comprising the following steps: constructing an increaseable reactive set and a decreaseable reactive set of substations and new energy stations; a provincial automatic voltage control system performs optimization calculation processing based on the increaseable reactive set and the decreaseable reactive set of substations and new energy stations transmitted by a local automatic voltage control subsystem, and generates a provincial reactive regulation instruction; a local automatic voltage control subsystem performs reactive optimization calculation processing based on the provincial reactive regulation instruction transmitted by the provincial automatic voltage control system and generates a local regulation instruction; the local automatic voltage control subsystem transmits the local regulation instruction to all new energy stations and substations in the corresponding gateway for reactive regulation; the method realizes effective utilization of the reactive regulation capability of the new energy stations, meets the reactive control requirements of the provincial and local coordinated gateway, ensures the reactive power balance of the gateway on the spot, and improves the safety and economy of the power grid operation.