Adaptive frequency modulation control platform and method for equipment group used in charging stations

Abstract

The present invention discloses an adaptive frequency modulation control platform and method for equipment groups for charging stations, and relates to the technical field of power equipment control. The platform comprises: a protection configuration module that connects a power controller and configures an initial power protection value at a target charging station. A branch positioning module that activates branch voltage and current monitoring instructions of a switching switch that is marked closed. A branch monitoring module that collects operation monitoring data and frequency difference values ​​and frequency difference change rates through monitoring instructions. A frequency difference-oriented decision-making module that analyzes monitoring data to set charging and discharging strategies. A simulation constraint configuration module that simulates the inertial characteristics of a target charging station and constructs an equipment group simulation model in combination with the operating laws and characteristics of a charging equipment group. An initial power protection value and a charging and discharging strategy are added to the model, a multi-level frequency modulation strategy system is established, and a frequency modulation control module that implements adaptive frequency modulation control is implemented. Thereby achieving the technical effect of improving frequency modulation efficiency and improving frequency modulation response and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment control, and in particular to an adaptive frequency modulation control platform and method for equipment groups used in charging stations. Background Art

[0002] With the rapid popularization of electric vehicles, the number of charging piles in charging stations has increased significantly, resulting in increased fluctuations in power grid load, which in turn affects the stability of the power grid. Existing frequency modulation control methods are mostly based on traditional generator sets, which are difficult to meet the complex and changeable power needs of charging stations. There are technical problems such as insufficient frequency modulation response speed and accuracy, and high frequency modulation costs. Summary of the invention

[0003] The present invention provides an adaptive frequency modulation control platform and method for equipment groups for charging stations, so as to solve the technical problems of insufficient frequency modulation response speed and accuracy and high frequency modulation cost in the prior art, and achieve the technical effects of improving frequency modulation efficiency and improving frequency modulation response and accuracy.

[0004] In a first aspect, the present invention provides an adaptive frequency modulation control platform for a device group for a charging station, wherein the platform comprises:

[0005] A protection configuration module is used to connect to a power controller at a target charging station and configure an initial power protection value.

[0006] A branch positioning module, which is used to activate a branch voltage and current monitoring instruction if any M of the N switching switches connected to the AC input end are in a closed state. The branch voltage and current monitoring instruction has a branch mark of the switching switch in a closed state.

[0007] The branch monitoring module is used to connect multiple voltage and current acquisition units through the branch voltage and current monitoring instructions, collect operation monitoring data, and collect frequency difference and frequency difference change rate.

[0008] A frequency difference-oriented decision module is used to analyze the fluctuations of the frequency difference and the frequency difference change rate according to the operation monitoring data, and set a charging and discharging strategy, wherein the charging and discharging strategy is based on the response speed requirement of the energy storage unit to frequency fluctuations.

[0009] A simulation constraint configuration module, which is used to simulate the inertia characteristics of the target charging station by adjusting the output ratio of the energy storage unit participating in the frequency regulation, and to set the equipment group simulation model in combination with the key equipment operation laws and equipment operation characteristics of the charging equipment group of the target charging station.

[0010] The frequency modulation control module is used to add the initial power protection value and the charging and discharging strategy based on the device group simulation model, establish a multi-level frequency modulation strategy system, and perform adaptive frequency modulation control on the charging device group of the target charging station.

[0011] In a second aspect, the present invention further provides a method for adaptive frequency modulation control of a device group for a charging station, wherein the method comprises:

[0012] At the target charging station, connect the power controller and configure the initial power protection value.

[0013] If any M switches among the N switches connected to the AC input terminal are in a closed state, a branch voltage and current monitoring instruction is activated, and the branch voltage and current monitoring instruction has a branch mark of the switch in a closed state.

[0014] Through the branch voltage and current monitoring instructions, multiple voltage and current acquisition units are connected to collect operation monitoring data, and collect frequency difference values ​​and frequency difference change rates.

[0015] According to the operation monitoring data, the fluctuations of the frequency difference and the frequency difference change rate are analyzed, and a charging and discharging strategy is set. The charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation.

[0016] By adjusting the output ratio of the energy storage unit participating in the frequency regulation, the inertia characteristics of the target charging station are simulated, and the equipment group simulation model is set in combination with the key equipment operation rules and equipment operation characteristics of the charging equipment group of the target charging station.

[0017] Based on the equipment group simulation model, the initial power protection value and the charging and discharging strategy are added to establish a multi-level frequency modulation strategy system, and adaptive frequency modulation control is performed on the charging equipment group of the target charging station.

[0018] The present invention discloses an adaptive frequency modulation control platform and method for equipment groups for charging stations, comprising: at a target charging station, firstly connecting a power controller and configuring an initial power protection value; when any M of N switching switches connected to an alternating current input terminal are in a closed state, activating a branch voltage and current monitoring instruction, and marking the branch of the switching switch in the closed state; through the branch voltage and current monitoring instruction, connecting multiple voltage and current acquisition units to collect operation monitoring data, including frequency difference and its change rate; based on the operation monitoring data, analyzing the fluctuation of the frequency difference and its change rate, formulating a charging and discharging strategy based on the response speed requirement of the energy storage unit to the frequency fluctuation; adjusting the output proportion of the energy storage unit participating in the frequency modulation to simulate the inertial characteristics of the target charging station, and establishing an equipment group simulation model in combination with the operation law and characteristics of the charging equipment group; in the equipment group simulation model, adding the initial power protection value and the charging and discharging strategy, constructing a multi-level frequency modulation strategy system, so as to perform adaptive frequency modulation control on the charging equipment group of the target charging station. The adaptive frequency modulation control platform and method for equipment groups for charging stations disclosed in the present invention solve the technical problems of insufficient frequency modulation response speed and accuracy and high frequency modulation cost, and achieve the technical effects of improving frequency modulation efficiency and improving frequency modulation response and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the adaptive frequency modulation control platform for the equipment group used in the charging station of the present invention;

[0020] Figure 2 It is a flow chart of the adaptive frequency modulation control method for a device group for a charging station of the present invention.

[0021] Explanation of the accompanying drawings: protection configuration module 11, branch positioning module 12, branch monitoring module 13, frequency difference guidance decision module 14, simulation constraint configuration module 15, frequency modulation control module 16. DETAILED DESCRIPTION

[0022] The technical solution provided in the embodiments of the present invention is to solve the technical problems of insufficient frequency modulation response speed and accuracy and high frequency modulation cost in the prior art. The overall idea adopted is as follows:

[0023] First, a power controller is connected to the target charging station and an initial power protection value is configured; then, if any M of the N switches at the AC input end are in a closed state, the branch voltage and current monitoring instruction is activated, and a branch mark is assigned to the switch in the closed state; then, through the branch voltage and current monitoring instruction, multiple voltage and current acquisition units are connected to collect operation monitoring data, and the frequency difference and the frequency difference change rate are collected; then, according to the operation monitoring data, the fluctuations of the frequency difference and the frequency difference change rate are analyzed, and the charging and discharging strategy is set, with the frequency fluctuation response speed requirement of the energy storage unit as the benchmark; then, by adjusting the output ratio of the energy storage unit participating in the frequency regulation, the inertial characteristics of the target charging station are simulated, and the equipment group simulation model is set in combination with the key operation laws and characteristics of the charging equipment group; finally, based on the equipment group simulation model, the initial power protection value and charging and discharging strategy are added, and a multi-level frequency regulation strategy system is established to perform adaptive frequency regulation control on the charging equipment group of the target charging station.

[0024] The above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods of the specification to better understand the above technical solution. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments of the present invention. It should be understood that the present invention is not limited to the example embodiments used only to explain the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, it should be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all of them. Embodiment 1

[0025] Figure 1 The figure is a flow chart of the adaptive frequency modulation control platform for equipment groups used in charging stations of the present invention, wherein the platform includes:

[0026] The protection configuration module 11 is used to connect to the power controller at the target charging station and configure the initial power protection value.

[0027] Specifically, the power controller is used to constrain the operating power of the target charging station according to an initial power protection value, wherein the initial power protection value refers to the maximum operating power allowed by the defined target charging station, and the operating condition of the power below the initial power protection value can be considered safe or economical.

[0028] In some embodiments, at the target charging station, connecting the power controller and configuring the initial power protection value, the execution steps include:

[0029] The rated operating parameters of the charging equipment group of the target charging station are obtained.

[0030] A data storage module connected to the target charging station is used to extract the power grid capacity and historical power consumption peak value of the target charging station.

[0031] A power protection threshold is set according to the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical power consumption peak value. The power protection threshold is used to constrain the power upper limit of the power controller.

[0032] Specifically, first, the rated operating parameters of the charging equipment group in the target charging station are obtained, including rated power, rated voltage, maximum load, etc., to ensure that the equipment operates safely within its design range. Then, the data storage module connected to the target charging station is used to extract the power consumption information related to the target charging station, such as the grid capacity and historical power consumption peak, to understand the power supply capacity and power demand changes of the station.

[0033] Specifically, the power protection threshold is calculated and set based on the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical peak power consumption. The power protection threshold takes into account the power demand of the grid and the performance of the charging equipment group to ensure that the power consumption level of the target charging station does not exceed the carrying capacity of the charging equipment group under high load conditions. Finally, the set power protection threshold is applied to the power controller to limit its power upper limit, thereby ensuring the safe and stable operation of the charging equipment and the grid.

[0034] In some implementations, the power protection threshold is set according to the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical peak power consumption, and the execution steps include:

[0035] The grid load index of the target charging station is evaluated based on the grid capacity and historical peak power consumption of the target charging station.

[0036] The power requirement and power fluctuation range under normal operation are obtained through the rated operating parameters of the charging device group.

[0037] Based on the power demand and power fluctuation range under normal operation, the power grid load index of the target charging station is integrated to obtain the power protection threshold.

[0038] Specifically, the grid load index is calculated based on the grid capacity and historical peak power consumption of the target charging station, where the grid load index = grid capacity / historical peak power consumption. This index reflects the load capacity of the grid during peak hours and is used to determine whether the grid can withstand additional charging demand.

[0039] Specifically, based on the rated operating parameters of the charging device group, its power demand and power fluctuation range under normal working conditions are calculated, where the power demand is the sum of the rated powers of multiple charging devices in the charging device group, and the power fluctuation range is determined by analyzing historical data and is a certain percentage of the rated power (such as 10%).

[0040] Furthermore, based on the power demand and power fluctuation range under normal operation, combined with the grid load index, a power protection threshold is set. Optionally, power protection threshold = total power demand + total power demand × power fluctuation range × grid load index. For example, if the grid capacity of the target charging station is 1000kW, the historical peak power consumption is 800kW, the total rated power of the charging equipment group is 600kW, and the power fluctuation range is 10%, then the power protection threshold = 600 + (600 × 0.1 × 0.8) = 648kW.

[0041] The branch positioning module 12 is used to activate the branch voltage and current monitoring instruction if any M switching switches among the N switching switches connected to the AC input end are in a closed state, and the branch voltage and current monitoring instruction has the branch mark of the switching switch in the closed state.

[0042] Specifically, a sensor or other detection means is used to monitor the status of each switching switch in real time. If there is a preset number of AC inputs, that is, when any M switching switches among the N switching switches connected to the AC input terminal are in a closed state, the corresponding branch voltage and current monitoring instructions are activated. The branch voltage and current monitoring instructions include a branch mark for identifying the switching switch in a closed state, where M is greater than or equal to 1.

[0043] The branch monitoring module 13 is used to connect multiple voltage and current acquisition units through the branch voltage and current monitoring instructions, collect operation monitoring data, and collect frequency difference values ​​and frequency difference change rates.

[0044] Specifically, according to the branch voltage and current monitoring instruction, the voltage and current acquisition units of M corresponding branches are called to collect operation monitoring data based on a preset acquisition accuracy, wherein the operation monitoring data includes a voltage data sequence of each branch and a current data sequence of each branch.

[0045] Further, the frequency difference between each branch is calculated based on the collected voltage and current signals, wherein the frequency difference is the difference between each branch and the standard frequency. Optionally, the frequency difference is a scalar to indicate the direction of the frequency difference, such as a positive frequency difference indicates a high frequency, and a negative frequency difference indicates a low frequency.

[0046] Furthermore, the time-varying characteristics of the frequency differences of multiple branches are analyzed to obtain the frequency difference change rate, wherein the frequency difference change rate is expressed as the slope of the frequency difference-time curve. The stability and operating status of the frequency between the branches can be understood through this change rate.

[0047] The frequency difference-oriented decision module 14 is used to analyze the fluctuations of the frequency difference and the frequency difference change rate according to the operation monitoring data, and set a charging and discharging strategy based on the response speed requirement of the energy storage unit to the frequency fluctuation.

[0048] Specifically, the response speed requirement of the energy storage unit is determined according to the fluctuation of the frequency difference and the frequency difference change rate, so as to quickly respond to frequency fluctuations and stabilize the grid frequency. When the frequency fluctuates quickly, the corresponding energy storage unit should have the ability to respond quickly; when the fluctuation is slow, the energy storage unit can be adjusted more slowly.

[0049] Optionally, the fluctuation range of the frequency difference and the frequency difference change rate also determines the charging and discharging capacity requirements of the energy storage unit. When the frequency difference is large, the energy storage system needs to provide a large power to balance the power grid, and when the frequency difference is small, the power demand is low.

[0050] Optionally, the charging and discharging strategy includes: when the frequency is higher than the target value (frequency is too fast), the energy storage unit should start charging to absorb excess power in the grid to reduce the frequency. The charging rate is set according to the size and rate of change of the frequency difference to avoid overreaction when the frequency rises rapidly. When the frequency is lower than the target value (frequency is too slow), the energy storage unit should start discharging to provide additional power to the grid to help increase the frequency. Similarly, the discharge rate should match the size and rate of change of the frequency difference to ensure timely and appropriate response to frequency fluctuations.

[0051] Through the above steps, the energy storage unit can adjust the charging and discharging strategy in real time based on the response speed requirements of frequency fluctuations, thereby ensuring the stable operation of the power grid.

[0052] In some embodiments, according to the operation monitoring data, the fluctuation of the frequency difference and the frequency difference change rate is analyzed, and a charging and discharging strategy is set. The charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation. The execution steps include:

[0053] A first conduction sequence is generated by connecting the AC power input terminal to a first switch in a closed state.

[0054] A second conduction sequence is generated by connecting the AC power input terminal to a second switch in a closed state.

[0055] The fluctuation characteristics of the frequency difference and the frequency difference change rate are determined through the first conduction sequence, the second conduction sequence to the Mth conduction sequence, and the first conduction sequence, the second conduction sequence to the Mth conduction sequence respectively represent the conduction sequences corresponding to the M switches.

[0056] Specifically, the AC input terminal is connected to the first switch connected in a closed state to obtain the current current and voltage values. These current and voltage values ​​are recorded to generate a first conduction sequence, including timestamp, conduction duration, frequency and other data. Then, the AC input terminal is connected to the second switch connected in a closed state, and the above steps are repeated to obtain the corresponding current and voltage values, and generate a second conduction sequence, which also includes timestamp, conduction duration, frequency and other information.

[0057] Furthermore, it is connected with other switching switches in sequence to traverse and generate M conduction sequences up to the Mth conduction sequence, and then, all conduction sequences are summarized, the frequency difference and the frequency difference change rate of each sequence are calculated, and the fluctuation characteristics of the frequency difference and the frequency difference change rate under different conduction sequences are analyzed by statistical methods, the rules and influencing factors are found out, and the fluctuation characteristics are obtained.

[0058] Optionally, according to the analysis results of the frequency difference and the frequency difference change rate, and determining the response speed requirements of the energy storage unit, set appropriate charge and discharge trigger conditions and response time, and formulate a charge and discharge strategy to ensure that the energy storage unit can respond in time and stabilize the grid when the grid frequency fluctuates.

[0059] In some implementations, determining the fluctuation characteristics of the frequency difference and the frequency difference change rate through the first conduction sequence, the second conduction sequence, and the Mth conduction sequence, the execution steps include:

[0060] A frequency modulation control grid is established through the AC power input terminal and the first switching switch, the second switching switch, and the Mth switching switch connected to the closed state. The first switching switch, the second switching switch, and the Mth switching switch all have branch codes of the switching switches, wherein M is used to represent the number of switching switches in the closed state, M>2, and M is a positive integer.

[0061] In the frequency modulation control power grid, the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the periodic characteristics of the Mth conduction sequence are configured, wherein the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the Mth conduction sequence are associated and mapped with the first conduction sequence, the second conduction sequence, and the Mth conduction sequence and the first switching switch, the second switching switch, and the Mth switching switch.

[0062] A distributed control framework is established through the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and so on to the periodic characteristics of the Mth conduction sequence. The distributed control framework includes a basic frequency modulation layer, an optimized frequency modulation layer, and an emergency frequency modulation layer.

[0063] Specifically, first, through the AC power input end, the first switching switch and the second switching switch in the closed state are connected in sequence until the Mth switching switch, ensuring that each switching switch works normally, thereby forming a stable frequency modulation control power grid for real-time monitoring and frequency adjustment.

[0064] Specifically, the periodic characteristics of each conduction sequence are analyzed to identify the regularity and periodic pattern of its frequency fluctuation, and then the periodic characteristics of the first conduction sequence, the second conduction sequence to the Mth conduction sequence are summarized to form corresponding parameter settings for optimization in the frequency modulation control power grid.

[0065] Exemplarily, first, the data of frequency difference and frequency difference change rate are collected from the first conduction sequence, the second conduction sequence to the Mth conduction sequence. Then, through signal processing technology, such as spectrum analysis methods such as Fourier transform, the time domain signal is converted into a frequency domain signal, the main frequency component of each sequence is determined, and the periodic characteristics of each conduction sequence, such as period, amplitude and phase, are extracted.

[0066] Optionally, the periodic characteristics are dynamically adjusted based on real-time monitoring results and historical data to ensure adaptability to changing load and frequency conditions.

[0067] Specifically, the distributed control framework includes a basic frequency regulation layer responsible for basic frequency regulation and stability. The basic frequency regulation layer has balanced frequency regulation accuracy and response speed, and is used to provide basic frequency regulation accuracy; an optimized frequency regulation layer that improves system efficiency by optimizing frequency regulation strategies. The optimized frequency regulation layer has high frequency regulation accuracy and is used to maximize the frequency accuracy of charging stations when responsiveness requirements are not high; an emergency frequency regulation layer that responds and adjusts quickly in emergency situations. The emergency frequency regulation layer has the highest frequency regulation response speed and can control the energy storage unit to respond to short-term overloads within a safe range.

[0068] Furthermore, the distributed control framework includes a basic frequency modulation layer, an optimized frequency modulation layer and an emergency frequency modulation layer, and the execution steps of the platform also include:

[0069] The energy storage unit is used as the frequency regulation core of the frequency regulation control grid.

[0070] The power controller and N switching switches are used as frequency regulation auxiliary control nodes of the frequency regulation control power grid.

[0071] The basic frequency modulation layer is obtained through the frequency modulation core of the frequency modulation control grid and the frequency modulation auxiliary control node of the frequency modulation control grid.

[0072] Specifically, the energy storage unit is the frequency regulation core of the frequency regulation control grid, responsible for providing the energy required for frequency regulation and stability. The power controller is a frequency regulation auxiliary control node, used to control the distribution and regulation of power. The switch is also a frequency regulation auxiliary control node, used to control the switch state of the circuit.

[0073] Exemplarily, obtaining the basic frequency modulation layer includes: initializing the frequency modulation core and the frequency modulation auxiliary control node, including defining basic variables and frequency modulation constraints according to parameters such as the capacity and charge and discharge rate of the energy storage unit, the control strategy and response parameters of the power controller, the turn-on sequence and periodic characteristics of the switching switch, etc. Then, monitor the state of each switching switch in real time, and record the switching switch that is currently in a closed state. Obtain grid frequency data. Next, detect the deviation between the current grid frequency and the target frequency, and adjust the charge and discharge rate and discharge frequency of the energy storage unit according to the frequency deviation to stabilize the frequency of the target charging station.

[0074] Furthermore, the execution steps of the platform also include:

[0075] In the basic frequency modulation layer, the initial power protection value and the charging and discharging strategy are combined to introduce an adaptive feedback loop.

[0076] In the adaptive feedback loop, the frequency modulation effect is synchronously evaluated, the initial power protection value is updated, and the optimized frequency modulation layer is established.

[0077] Exemplarily, the initial power protection value and the charge-discharge strategy are combined in the basic frequency modulation layer, an adaptive feedback loop is introduced, and the frequency modulation effect is simultaneously evaluated and the initial power protection value is updated in the adaptive feedback loop to establish an optimized frequency modulation layer, including: taking the initial power protection value and the charge-discharge strategy as the optimization objects, when the frequency modulation effect is not good, adjusting the initial power protection value and the charge-discharge strategy accordingly according to the deviation direction of the frequency modulation effect. Among them, the adjustment of the initial power protection value is used to optimize the frequency modulation range, and a higher power protection value can increase the upper limit of the frequency modulation capability. The feedback adjustment of the charge-discharge strategy is used to improve the accuracy of the frequency modulation, such as changing the mapping model of the frequency difference and the frequency difference change rate in the charge-discharge strategy and the charge-discharge parameters of the energy storage unit.

[0078] The simulation constraint configuration module 15 is used to simulate the inertia characteristics of the target charging station by adjusting the output ratio of the energy storage unit participating in the frequency regulation, and to set the equipment group simulation model in combination with the key equipment operation rules and equipment operation characteristics of the charging equipment group of the target charging station.

[0079] Specifically, according to the load demand and frequency fluctuation of the charging equipment group, the output ratio of the energy storage unit in the frequency modulation is adjusted, the system response under different operating conditions is simulated, and the key operating laws and characteristics of the charging equipment group, such as power demand fluctuation and response time, are obtained as the basic data of the simulation model. Then, based on the above data, the simulation model of the charging equipment group is established by considering the interaction between the devices and the impact on the system frequency.

[0080] Optionally, the simulation performance of the simulation model is verified through actual operation data, and the parameters in the equipment group simulation model are adjusted to ensure that the model can truly reflect the operating characteristics of the target charging station.

[0081] The frequency modulation control module 16 is used to add the initial power protection value and the charging and discharging strategy based on the device group simulation model, establish a multi-level frequency modulation strategy system, and perform adaptive frequency modulation control on the charging device group of the target charging station.

[0082] In some embodiments, the platform's execution steps further include:

[0083] In the adaptive feedback loop, a protection mechanism is set according to the abnormal operating state of the charging device group.

[0084] Through the protection mechanism, a risk level is evaluated, which is used to mark an emergency frequency regulation control task.

[0085] Based on the adaptive feedback loop and combined with the emergency frequency regulation control task, the multi-level frequency regulation strategy system is obtained by tilting the deployment in the distributed control framework.

[0086] Specifically, the initial power protection value is integrated as the upper limit of protection in the simulation model, and the abnormal operation status samples of the charging equipment group within the range are called. Based on multiple abnormal operation status samples, multiple types of abnormal trigger boundaries in the protection mechanism are defined, where each type of abnormal trigger boundary corresponds to an abnormal situation, such as overload, frequency overrun, communication abnormality, etc. Then, the response strategy for each type of abnormal situation is defined, such as automatic power reduction, sending an alarm, or switching to backup equipment, to generate a protection mechanism.

[0087] Furthermore, through the abnormal operation evaluation method of the expert system or the target charging station, the sub-abnormal trigger boundary belonging to the emergency frequency regulation control task in the protection mechanism is marked to realize the risk level assessment.

[0088] Specifically, different tilt weights are assigned to the adaptive feedback loop and the emergency frequency control task to ensure that the emergency frequency control tasks of different risk levels can be processed with the correct priority. For example, the lower-level emergency frequency control task takes precedence over the basic frequency control layer in the adaptive feedback loop, and the optimization of the adaptive feedback loop can be carried out simultaneously with the lower-level emergency frequency control task, while the higher-level emergency frequency control task is given the highest priority for response and disposal.

[0089] In summary, the adaptive frequency modulation control platform for charging station equipment group provided by the present invention has the following technical effects:

[0090] At the target charging station, first connect the power controller and configure the initial power protection value; when any M of the N switches connected to the AC input end are in a closed state, activate the branch voltage and current monitoring instruction, and mark the branch of the switch in the closed state; through the branch voltage and current monitoring instruction, connect multiple voltage and current acquisition units to collect operation monitoring data, including frequency difference and its change rate; based on the operation monitoring data, analyze the fluctuation of frequency difference and its change rate, formulate a charging and discharging strategy based on the response speed requirement of the energy storage unit to frequency fluctuation; adjust the output proportion of the energy storage unit participating in frequency regulation to simulate the inertial characteristics of the target charging station, and establish a device group simulation model in combination with the operation law and characteristics of the charging equipment group; in the device group simulation model, add the initial power protection value and charging and discharging strategy, build a multi-level frequency regulation strategy system, so as to perform adaptive frequency regulation control on the charging equipment group of the target charging station. Then, the technical effect of improving frequency regulation efficiency, frequency regulation response and accuracy is achieved. Embodiment 2

[0091] Figure 2 : is a flow chart of the method for adaptive frequency modulation control of a charging station equipment group according to the present invention. For example, Figure 1 The structure of the adaptive frequency modulation control platform for the equipment group of the charging station of the present invention can be used to achieve the following Figure 2 The process shown.

[0092] Based on the same concept as the adaptive frequency modulation control platform for a charging station device group in the above embodiment, the present invention also provides an adaptive frequency modulation control method for a charging station device group, including:

[0093] At the target charging station, connect the power controller and configure the initial power protection value.

[0094] If any M switches among the N switches connected to the AC input terminal are in a closed state, a branch voltage and current monitoring instruction is activated, and the branch voltage and current monitoring instruction has a branch mark of the switch in a closed state.

[0095] Through the branch voltage and current monitoring instructions, multiple voltage and current acquisition units are connected to collect operation monitoring data, and collect frequency difference values ​​and frequency difference change rates.

[0096] According to the operation monitoring data, the fluctuations of the frequency difference and the frequency difference change rate are analyzed, and a charging and discharging strategy is set. The charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation.

[0097] By adjusting the output ratio of the energy storage unit participating in the frequency regulation, the inertia characteristics of the target charging station are simulated, and the equipment group simulation model is set in combination with the key equipment operation rules and equipment operation characteristics of the charging equipment group of the target charging station.

[0098] Based on the equipment group simulation model, the initial power protection value and the charging and discharging strategy are added to establish a multi-level frequency modulation strategy system, and adaptive frequency modulation control is performed on the charging equipment group of the target charging station.

[0099] In a feasible embodiment, at the target charging station, a power controller is connected and an initial power protection value is configured, including:

[0100] Acquire the rated operating parameters of the charging equipment group of the target charging station; connect to the data storage module of the target charging station to extract the power grid capacity and historical power consumption peak of the target charging station; set a power protection threshold through the rated operating parameters of the charging equipment group, the power grid capacity and historical power consumption peak of the target charging station, and the power protection threshold is used to constrain the power upper limit of the power controller.

[0101] In a feasible implementation, the power protection threshold is set according to the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical peak power consumption, including:

[0102] The grid carrying index of the target charging station is evaluated through the grid capacity and historical peak power consumption of the target charging station; the power demand and power fluctuation range under normal operation are obtained through the rated operating parameters of the charging equipment group; based on the power demand and power fluctuation range under normal operation, the grid carrying index of the target charging station is integrated to obtain the power protection threshold.

[0103] In a feasible embodiment, according to the operation monitoring data, the fluctuation of the frequency difference and the frequency difference change rate is analyzed, and a charging and discharging strategy is set. The charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation, and includes:

[0104] A first conduction sequence is generated through the AC power input terminal and a first switching switch connected in a closed state; a second conduction sequence is generated through the AC power input terminal and a second switching switch connected in a closed state; and the fluctuation characteristics of the frequency difference and the frequency difference change rate are determined through the first conduction sequence, the second conduction sequence, and up to the Mth conduction sequence, and the first conduction sequence, the second conduction sequence, and up to the Mth conduction sequence respectively represent the conduction sequences corresponding to the M switching switches.

[0105] In a feasible implementation, determining the fluctuation characteristics of the frequency difference and the frequency difference change rate through the first conduction sequence, the second conduction sequence, and the Mth conduction sequence includes:

[0106] A frequency modulation control grid is established through the AC input terminal and connected to a first switching switch, a second switching switch, and an Mth switching switch in a closed state, wherein the first switching switch, the second switching switch, and the Mth switching switch all have branch codes of the switching switches, wherein M is used to characterize the number of switching switches in a closed state, M>2, and M is a positive integer; in the frequency modulation control grid, periodic characteristics of the first conduction sequence, periodic characteristics of the second conduction sequence, ..., and periodic characteristics of the Mth conduction sequence are configured, wherein the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the Mth conduction sequence are mutually associated and mapped with the first conduction sequence, the second conduction sequence, and the Mth conduction sequence and the first switching switch, the second switching switch, and the Mth switching switch; a distributed control framework is established through the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the Mth conduction sequence. The distributed control framework includes a basic frequency modulation layer, an optimized frequency modulation layer, and an emergency frequency modulation layer.

[0107] In a feasible implementation, in the basic frequency modulation layer, the initial power protection value and the charging and discharging strategy are combined to derive an adaptive feedback loop; in the adaptive feedback loop, the frequency modulation effect is synchronously evaluated, the initial power protection value is updated, and the optimized frequency modulation layer is established.

[0108] In a feasible embodiment, in the adaptive feedback loop, a protection mechanism is set in comparison with the abnormal operating state of the charging equipment group; through the protection mechanism, the risk level is evaluated, and the risk level is used to mark the emergency frequency regulation control task; based on the adaptive feedback loop, combined with the emergency frequency regulation control task, the distributed control framework is tilted to obtain the multi-level frequency regulation strategy system.

[0109] It should be understood that the embodiments mentioned in this specification focus on their differences from other embodiments. The specific embodiments in the aforementioned embodiment one are also applicable to the adaptive frequency modulation control method for equipment groups for charging stations described in embodiment two. For the sake of brevity of the specification, they will not be further elaborated here.

[0110] It should be understood that the embodiments disclosed in the present invention and the above description can enable those skilled in the art to use the present invention to implement the present invention. At the same time, the present invention is not limited to the above-mentioned embodiments. It should be understood that those skilled in the art can still modify the technical solutions recorded in the above-mentioned embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. The adaptive frequency modulation control platform for equipment groups used in charging stations is characterized by: include: A protection configuration module, the protection configuration module is used to connect to the power controller at the target charging station and configure an initial power protection value; A branch positioning module, the branch positioning module is used to activate a branch voltage and current monitoring instruction if any M switching switches among the N switching switches connected to the AC input terminal are in a closed state, the branch voltage and current monitoring instruction having a branch mark of the switching switch in a closed state; A branch monitoring module, the branch monitoring module is used to connect multiple voltage and current acquisition units through the branch voltage and current monitoring instructions, collect operation monitoring data, and collect frequency difference and frequency difference change rate; A frequency difference-oriented decision module, the frequency difference-oriented decision module is used to analyze the fluctuation of the frequency difference value and the frequency difference change rate according to the operation monitoring data, and set a charge and discharge strategy, wherein the charge and discharge strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation; A simulation constraint configuration module, which is used to simulate the inertia characteristics of the target charging station by adjusting the output ratio of the energy storage unit participating in the frequency modulation, and to set a device group simulation model in combination with the key equipment operation rules and equipment operation characteristics of the charging equipment group of the target charging station; A frequency modulation control module, which is used to add the initial power protection value and the charging and discharging strategy based on the device group simulation model, establish a multi-level frequency modulation strategy system, and perform adaptive frequency modulation control on the charging device group of the target charging station; According to the operation monitoring data, the fluctuation of the frequency difference and the frequency difference change rate is analyzed, and a charging and discharging strategy is set. The charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation, and includes: Generate a first conduction sequence through the AC input terminal and the first switch connected to the closed state; Generate a second conduction sequence through the AC input terminal and a second switch connected to a closed state; Determine the fluctuation characteristics of the frequency difference and the frequency difference change rate through the first conduction sequence, the second conduction sequence, and the Mth conduction sequence, wherein the first conduction sequence, the second conduction sequence, and the Mth conduction sequence respectively represent conduction sequences corresponding to the M switches; Determining the fluctuation characteristics of the frequency difference and the frequency difference change rate through the first conduction sequence, the second conduction sequence and the Mth conduction sequence includes: A frequency modulation control grid is established through the AC input terminal and connected to a first switching switch, a second switching switch, and an Mth switching switch in a closed state, wherein the first switching switch, the second switching switch, and the Mth switching switch all have branch codes of the switching switches, wherein M is used to represent the number of switching switches in a closed state, M>2, and M is a positive integer; In the frequency modulation control grid, the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the periodic characteristics of the Mth conduction sequence are configured, wherein the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and the periodic characteristics of the Mth conduction sequence are mutually associated and mapped with the first conduction sequence, the second conduction sequence, and the Mth conduction sequence and the first switching switch, the second switching switch, and the Mth switching switch; Establishing a distributed control framework through the periodic characteristics of the first conduction sequence, the periodic characteristics of the second conduction sequence, and up to the periodic characteristics of the Mth conduction sequence, wherein the distributed control framework includes a basic frequency modulation layer, an optimized frequency modulation layer, and an emergency frequency modulation layer; The distributed control framework includes a basic frequency modulation layer, an optimized frequency modulation layer and an emergency frequency modulation layer, including: Using the energy storage unit as the frequency regulation core of the frequency regulation control grid; Using the power controller and N switches as frequency regulation auxiliary control nodes of the frequency regulation control grid; Acquire the basic frequency modulation layer through the frequency modulation core of the frequency modulation control grid and the frequency modulation auxiliary control node of the frequency modulation control grid; In the basic frequency modulation layer, an adaptive feedback loop is derived by combining the initial power protection value and the charging and discharging strategy; In the adaptive feedback loop, synchronously evaluating the frequency modulation effect, updating the initial power protection value, and establishing the optimized frequency modulation layer; In the adaptive feedback loop, a protection mechanism is set according to the abnormal operation state of the charging device group; By means of the protection mechanism, a risk level is evaluated, and the risk level is used to mark an emergency frequency regulation control task; Based on the adaptive feedback loop and combined with the emergency frequency regulation control task, the multi-level frequency regulation strategy system is obtained by tilting the deployment in the distributed control framework.

2. The adaptive frequency modulation control platform for equipment groups for charging stations according to claim 1, characterized in that: At the target charging station, connect the power controller and configure the initial power protection value, including: Acquire rated operating parameters of the charging equipment group of the target charging station; Connecting to the data storage module of the target charging station to extract the grid capacity and historical peak power consumption of the target charging station; A power protection threshold is set according to the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical power consumption peak value. The power protection threshold is used to constrain the power upper limit of the power controller.

3. The adaptive frequency modulation control platform for charging station equipment group according to claim 2, characterized in that: The power protection threshold is set according to the rated operating parameters of the charging equipment group, the grid capacity of the target charging station, and the historical power consumption peak value, including: Evaluate the grid load index of the target charging station based on the grid capacity and historical peak power consumption of the target charging station; Obtaining the power demand and power fluctuation range under normal operation through the rated operating parameters of the charging equipment group; Based on the power demand and power fluctuation range under normal operation, the power grid load index of the target charging station is integrated to obtain the power protection threshold.

4. A method for adaptive frequency modulation control of a device group for a charging station, characterized in that: The method is applied to the adaptive frequency modulation control platform for a charging station equipment group according to any one of claims 1 to 3, and the method comprises: At the target charging station, connect the power controller and configure the initial power protection value; If any M of the N switches connected to the AC input terminal are in a closed state, a branch voltage and current monitoring instruction is activated, wherein the branch voltage and current monitoring instruction has a branch mark of the switch in the closed state; Through the branch voltage and current monitoring instructions, multiple voltage and current acquisition units are connected to collect operation monitoring data, and collect frequency difference and frequency difference change rate; Analyze the fluctuations of the frequency difference and the frequency difference change rate according to the operation monitoring data, and set a charging and discharging strategy, wherein the charging and discharging strategy is based on the response speed requirement of the energy storage unit to the frequency fluctuation; By adjusting the output ratio of the energy storage unit participating in the frequency modulation, the inertia characteristics of the target charging station are simulated, and the equipment group simulation model is set in combination with the key equipment operation rules and equipment operation characteristics of the charging equipment group of the target charging station; Based on the equipment group simulation model, the initial power protection value and the charging and discharging strategy are added to establish a multi-level frequency modulation strategy system, and adaptive frequency modulation control is performed on the charging equipment group of the target charging station.

Images