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CN-121973660-A - Intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging pile

CN121973660ACN 121973660 ACN121973660 ACN 121973660ACN-121973660-A

Abstract

The invention belongs to the technical field of power supply scheduling, in particular to an intelligent regulation and control method for UPS centralized power supply for an underground alternating-current charging pile, which comprises the steps of obtaining the charge state and the travel end point information of a vehicle and calculating the theoretical residual electric quantity; the method comprises the steps of selecting candidate charging parking spaces along a driving path, obtaining UPS releasable power and load rate, collecting environment data, bus voltage distortion rate and load level, calculating charging time length and electricity supplementing quantity, screening charging piles which meet constraint conditions and are safe in environment, determining target charging piles, carrying out charging power prediction by combining input power of a vehicle charger, determining an inverter module scheduling strategy and bus parameters according to available capacity and redundancy capacity of the UPS, forming a preset scheme, starting the inverter module when the vehicle approaches and completing parallel operation synchronization to form a preset output power supply state, obtaining BMS feedback after the vehicle is accessed and carrying out matching judgment with the preset scheme, and executing charging when the conditions are met, otherwise, executing after adjustment, thereby improving power supply stability and charging efficiency.

Inventors

  • BAI LIN

Assignees

  • 深圳市巨鼎电子有限公司

Dates

Publication Date
20260505
Application Date
20260401

Claims (9)

  1. 1. An intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging piles is characterized by comprising the following steps: When a user sends a charging request, acquiring the current charge state and travel end point information of the vehicle, and calculating the theoretical residual electric quantity of the vehicle reaching a target charging pile area to form charging prediction data; Screening candidate charging parking spaces along a driving path, acquiring releasable power and current load rate of UPS centralized power supply units corresponding to each candidate parking space, and simultaneously acquiring underground environment sensor data, current voltage distortion rate and load level of a power distribution alternating current bus to form candidate charging piles and an environment data set; calculating the estimated alternating-current charging duration and the charging quantity of each candidate charging pile based on the charging prediction data, the candidate charging pile and the environment data set, screening the charging piles which meet the preset constraint conditions and the environment data meet the safety threshold, and determining target charging piles and charging demand data; based on the target charging pile and the charging demand data, the charging power prediction is carried out by combining the allowable input power of a vehicle charger, and an inversion module scheduling strategy and bus electrical parameters are determined according to the available capacity and redundancy capacity of the UPS centralized power supply unit to form a UPS preset scheme; When the vehicle approaches the target charging pile area, starting a corresponding number of inverter modules according to the UPS preset scheme and completing parallel operation synchronization, so that the voltage of the alternating current bus is stabilized at a preset value, and a pre-output power supply state is formed; and in the pre-output power supply state, after the vehicle is connected to the target alternating-current charging pile, acquiring the actual allowable charging voltage and current range fed back by the vehicle battery management system, performing matching judgment on the charging power corresponding to the UPS pre-adjustment scheme, performing charging when the matching condition is met, and adjusting and performing charging power when the matching condition is not met.
  2. 2. The intelligent regulation and control method for UPS centralized power supply for underground ac charging piles according to claim 1, wherein the steps of screening candidate charging parking spaces along a driving path, obtaining releasable power and current load rate of UPS centralized power supply units corresponding to each candidate parking space, and simultaneously collecting underground environment sensor data and current voltage distortion rate and load level of a distribution ac bus to form candidate charging piles and environment data sets include: Constructing a path node sequence along a vehicle driving path, and carrying out space association screening on underground charging parking spaces by taking each path node as a reference to determine a candidate charging parking space set; Based on the candidate charging parking space sets, obtaining rated capacity and current output power of UPS centralized power supply units corresponding to each candidate charging parking space, calculating releasable power of the UPS centralized power supply units according to a difference value between the rated capacity and the current output power, and determining a current load rate according to a proportional relation between the current output power and the rated capacity to form a power supply capacity parameter set; collecting underground environment sensor data of the area where each candidate charging parking space is located, and performing time synchronization processing on the underground environment sensor data to form an environment parameter set; carrying out electric energy quality analysis on voltage signals of a power distribution alternating current bus to obtain a voltage distortion rate, and calculating a load level according to a proportion relation between bus current and rated current to form an electric parameter set; Based on the coupling relation between the power supply capacity parameter set and the electric parameter set, consistency constraint judgment is carried out on the power supply capacity corresponding to each candidate charging parking space and the bus running state, and the candidate charging parking spaces which do not meet the preset coupling constraint condition are removed; And carrying out unified association packaging on the remaining candidate charging parking space sets, the corresponding power supply capacity parameter sets, the environment parameter sets and the electrical parameter sets to obtain candidate charging piles and environment data sets.
  3. 3. The intelligent regulation and control method for UPS centralized power supply for underground ac charging piles according to claim 2, wherein the calculating the predicted ac charging duration and the power supply amount of each candidate charging pile based on the charging prediction data and the candidate charging pile and the environmental data set, screening the charging piles which meet the preset constraint condition and the environmental data meet the safety threshold, and determining the target charging pile and the charging demand data includes: calculating the unit time available electric energy of each candidate charging pile under the constraint of the current power supply capacity and bus running state by combining the power supply capacity parameter set and the electric parameter set corresponding to each candidate charging parking space in the candidate charging pile and the environment data set based on the theoretical residual electric quantity representing that the vehicle reaches the target charging pile area in the charging prediction data, and forming a charging capacity representation parameter; Calculating the predicted alternating-current charging duration and the complementary power corresponding to each candidate charging pile based on the charging capacity characterization parameter and the difference value between the theoretical residual power and the preset target power to form a charging demand parameter set, wherein the preset target power comprises the power required by a stroke set by a user or the rated capacity of a battery; threshold judgment is carried out on the environmental safety states corresponding to the candidate charging parking spaces based on the environmental parameter set, and the candidate charging parking spaces with environmental parameters not meeting the safety threshold conditions are removed; Constraint screening is carried out on the remaining candidate charging parking spaces based on the power supply capacity parameter set, the electrical parameter set, the charging demand parameter set and preset constraint conditions constructed based on the power supply capacity parameter set, so that a candidate charging pile set is determined; And selecting a candidate charging pile with optimal predicted alternating-current charging duration from the candidate charging pile set meeting the preset constraint condition as a target charging pile, and extracting corresponding predicted alternating-current charging duration and the charging quantity to form charging demand data.
  4. 4. The intelligent regulation and control method for UPS centralized power supply for underground ac charging piles according to claim 3, wherein the constraint screening is performed on remaining candidate charging piles based on the power supply capability parameter set, the electrical parameter set, the charging demand parameter set and preset constraint conditions constructed based on the power supply capability parameter set, and determining the candidate charging pile set includes: Determining the upper limit of the power supply capacity of each candidate charging parking space in a preset time window based on the releasable power and the current load rate corresponding to each candidate charging parking space in the power supply capacity parameter set; performing electric stability correction on the upper limit of the power supply capacity based on the voltage distortion rate and the load level corresponding to each candidate charging parking space in the electric parameter set, wherein the electric stability correction comprises the steps of determining a first correction coefficient according to the voltage distortion rate, determining a second correction coefficient according to the load level, and multiplying the upper limit of the power supply capacity with the first correction coefficient and the second correction coefficient to obtain corrected power supply capacity parameters; constructing a charging demand constraint interval based on the predicted alternating-current charging duration and the electric quantity corresponding to each candidate charging parking space in the charging demand parameter set; based on the corrected power supply capacity parameter and the charging demand constraint interval, carrying out supply-demand matching judgment, and eliminating candidate charging parking spaces which cannot meet the charging demand; Carrying out system rule compliance judgment on the candidate charging parking spaces judged by supply and demand matching in combination with preset constraint conditions constructed based on the power supply capacity parameter set, and eliminating the candidate charging parking spaces which do not meet the preset constraint conditions; And establishing association mapping according to the power supply connection relation between each candidate charging parking space and the alternating-current charging piles, and determining a candidate charging pile set according to the association mapping.
  5. 5. The intelligent regulation and control method for UPS centralized power supply for underground ac charging pile according to claim 4, wherein the step of forming UPS preset solution based on the target charging pile and charging demand data, by combining the allowable input power of the vehicle charger, and performing charging power prediction, and determining the scheduling policy of the inverter module and the electrical parameters of the bus according to the available capacity and redundancy capability of the UPS centralized power supply unit, includes: Determining the charging power requirement of the target charging pile according to the charging requirement data of the target charging pile and the allowable input power of the vehicle charger, and forming a charging power requirement parameter set, wherein the charging power requirement parameter set comprises a charging power value in unit time, an expected charging duration and an expected charging quantity; Planning the starting and stopping sequence and the number of parallel machines of the inverter modules according to the matching relation between the charging power demand parameter set and the available capacity and redundancy capacity of the UPS centralized power supply unit to form an inverter module scheduling strategy parameter set, wherein the inverter module scheduling strategy parameter set comprises starting and stopping time points of each inverter module, parallel machines and corresponding releasable power values; according to the dispatching strategy parameter set of the inversion module, adjusting bus electrical parameters including voltage amplitude, frequency and phase to form a bus electrical parameter set, enabling the bus to meet the parallel operation synchronization requirement, and recording an adjusted bus stable interval and an instantaneous allowable deviation range; and carrying out association packaging on the inverter module scheduling strategy parameter set and the bus electrical parameter set to form a complete UPS preset scheme.
  6. 6. The intelligent regulation and control method for UPS centralized power supply for underground ac charging pile according to claim 5, wherein the step of planning the start-stop sequence and the parallel operation number of the inverter module according to the matching relationship between the charging power demand parameter set and the available capacity and redundancy capacity of the UPS centralized power supply unit to form an inverter module scheduling policy parameter set comprises: Acquiring rated power and current running state of each inversion module in the UPS centralized power supply unit, carrying out derating correction on the rated power according to the current running state, calculating releasable power of each inversion module, and forming an available power parameter set of the inversion module, wherein the current running state comprises current load rate, accumulated running duration and health state; according to the charging power value of each unit time in the charging power demand parameter set, screening an inversion module combination meeting the power demand and meeting the redundancy requirement from the inversion module available power parameter set in combination with a preset redundancy requirement, and determining a minimum inversion module set and a corresponding parallel operation combination required by each time period; determining the start-stop sequence of each inversion module according to the inversion module combination determined by each time period and a preset priority rule, generating an inversion module start-stop sequence, and associating the start-stop sequence with the combination of each time period and the releasable power value; and performing association integration on the start-stop sequence, the parallel combination and the releasable power values of each time period of the inversion module to form an inversion module scheduling strategy parameter set.
  7. 7. The intelligent regulation and control method of UPS centralized power supply for underground ac charging pile according to claim 6, wherein when the vehicle approaches the target charging pile area, the corresponding number of inverter modules are started according to the UPS preset scheme and parallel operation synchronization is completed, so that the ac bus voltage is stabilized at the pre-established value, and a pre-output power supply state is formed, which comprises: Starting a required number of inversion modules according to the inversion module scheduling strategy parameter set, and completing preliminary parallel operation synchronization of each inversion module according to the start-stop sequence; in the parallel operation synchronization process, the voltage amplitude, frequency and phase of an alternating current bus are adjusted, and the output of an inversion module is dynamically corrected, so that bus parameters approach to a pre-established value; When the bus voltage, frequency and phase are stabilized within the preset value and the allowable deviation range, a pre-output power supply state is formed.
  8. 8. The intelligent regulation and control method for centralized power supply of UPS for underground AC charging pile according to claim 7, wherein in the parallel operation synchronization process, the voltage amplitude, frequency and phase of the AC bus are adjusted, the output of the inversion module is dynamically corrected, the bus parameter approaches to the pre-established value, and the method comprises the following steps: Acquiring the current voltage amplitude, frequency and phase of an alternating current bus, and performing deviation calculation with a pre-established value to obtain voltage deviation amount, frequency deviation amount and phase deviation amount; according to rated capacity, current load rate and health state of each inversion module, proportion adjustment coefficients of each inversion module are respectively determined; multiplying the deviation by a proportional adjustment coefficient of a corresponding inversion module to obtain an output power correction quantity of each inversion module, leading the correction quantity to be in direct proportion to the deviation, and adjusting the output of the inversion module; Setting upper and lower limit constraints on the output correction quantity of each inversion module; Distributing the output correction quantity of the inversion module according to the priority of the module, wherein the high priority module firstly executes correction, and the low priority module is used as an aid to form an output correction sequence of the inversion module; continuously monitoring the voltage amplitude, frequency and phase of the alternating current bus, updating the deviation in real time, and repeating the fine tuning operation according to the correction sequence; In the fine tuning process, limiting the change rate of the bus parameter, avoiding instantaneous overshoot, and dynamically adjusting the correction step length according to the bus response; when the bus voltage amplitude, frequency and phase are stabilized within the pre-established value and the allowable deviation range, the bus parameter is confirmed to be approaching to the pre-established value.
  9. 9. The intelligent regulation and control method for UPS centralized power supply for underground ac charging piles according to claim 8, wherein in the pre-output power supply state, after a vehicle is connected to a target ac charging pile, the actual allowable charging voltage and current range fed back by the vehicle battery management system is obtained, and the matching judgment is performed on the charging power corresponding to the UPS pre-adjustment scheme, charging is performed when the matching condition is satisfied, and the charging power is adjusted and performed when the matching condition is not satisfied, including: Acquiring an actual allowable charging voltage and current range fed back by a vehicle battery management system, and calculating actual allowable charging power; comparing the actual allowable charging power with a releasable power value corresponding to an inverter module scheduling strategy parameter set in the UPS preset scheme; if the actual allowable charging power is not smaller than the releasable power value, judging that a matching condition is met, and executing charging according to the inverter module scheduling strategy parameter set and the bus electrical parameter set; if the actual allowable charging power is smaller than the releasable power value, judging that the matching condition is not met, and recalculating the minimum inverter module quantity required for meeting the power requirement according to the actual allowable charging power; When the number of the minimum inversion modules is smaller than the number of parallel operation in the scheduling strategy parameter set of the inversion modules, redundant inversion modules are reduced, and the minimum number meeting the power requirement and the redundancy requirement is reserved; when the minimum inverter module number is equal to the parallel operation number in the inverter module scheduling strategy parameter set, maintaining the current inverter module combination, and reducing the output power of each inverter module until the output power is matched with the actual allowable charging power; When the minimum number of the inversion modules is larger than the number of parallel operation in the inversion module scheduling strategy parameter set, adding the inversion modules and adjusting the start-stop sequence until the power requirement is met; And executing charging according to the adjusted inverter module scheduling strategy and the busbar electrical parameter set.

Description

Intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging pile Technical Field The invention relates to the technical field of power supply scheduling, in particular to an intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging piles. Background An intelligent regulation and control method for centralized power supply of UPS for underground AC charging piles is characterized in that in closed scenes such as underground parking lots, a unified UPS centralized power supply unit is arranged to convert commercial power or energy storage power supply into stable AC power, centralized power supply is carried out on a plurality of AC charging piles through a public AC bus, and meanwhile, the power supply start-stop, power distribution and load switching of each charging pile are managed by combining with preset regulation and control rules. In the prior art, electric energy is converted into stable alternating current output by an internal rectifying and inverting unit of a UPS (uninterrupted Power supply) through accessing a commercial power or an energy storage power supply into a UPS system, and the electric energy is supplied to a plurality of underground alternating current charging piles through a unified alternating current bus, when a vehicle is accessed into any charging pile, the system distributes charging power according to preset control logic (such as sequential distribution or simple load balancing), starts and stops part of inverting modules or adjusts output power according to the current total load condition, and in the operation process, the system monitors basic electric parameters such as bus voltage, current and the like, and performs corresponding power adjustment when the load changes so as to maintain the power supply continuity and basic stability, thereby realizing centralized power supply and unified management of a plurality of charging piles. The technical scheme is that although the UPS centralized power supply unit in the prior art can be used for completing regulation and control of alternating current charging piles, the quantity of the alternating current charging piles in closed scenes such as underground parking lots is continuously increased along with popularization of electric vehicles, the existing charging management mode is used for distributing the charging piles on the basis of fixed rules, the difference of residual electric quantity when the vehicles arrive and actual charging demands of users are not fully considered, the situation that charging power is not matched with the requirements of the vehicles is caused, charging interruption or charging time exceeds expectancy is easy to occur, meanwhile, safety factors such as temperature and humidity and water accumulation conditions of the underground environment are often ignored, equipment damage or potential safety hazards exist, and in addition, when a plurality of vehicles are simultaneously connected to charge, the power supply equipment lacks the capacity of cooperative scheduling of multiple power sources, the running quantity and output distribution are difficult to be dynamically regulated according to real-time loads, busbar voltage fluctuation, frequency deviation and electric energy quality reduction are easy to be caused, and thus charging stability and equipment service life are affected. Therefore, the invention provides an intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging piles. Disclosure of Invention The embodiment of the application provides an intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging piles, which can effectively reduce equipment faults and safety risks caused by environmental factors in underground closed scenes and realize collaborative optimization of charging requirements, power supply resources and environmental safety under distributed control. In order to achieve the above purpose, the application adopts the following technical scheme: The embodiment of the application provides an intelligent regulation and control method for UPS centralized power supply for underground alternating-current charging piles, which comprises the following steps: When a user sends a charging request, acquiring the current charge state and travel end point information of the vehicle, and calculating the theoretical residual electric quantity of the vehicle reaching a target charging pile area to form charging prediction data; Screening candidate charging parking spaces along a driving path, acquiring releasable power and current load rate of UPS centralized power supply units corresponding to each candidate parking space, and simultaneously acquiring underground environment sensor data, current voltage distortion rate and load level of a power di