V2G-based power quality control method and device, and computer equipment

Abstract

The invention relates to a V2G-based electric energy quality control method and device and computer equipment, and relates to the technical field of electric power. The method comprises the following steps: acquiring charging and discharging information of a target vehicle collected by each charging pile; acquiring power grid operation information of the target power grid; determining each quality evaluation index value corresponding to the target power grid according to the charging and discharging information and the power grid operation information; and when the quality evaluation index value exceeds a preset index threshold value, starting a quality control function of the power grid management module. The method can improve the control efficiency of the electric energy quality.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a V2G-based power quality control method, device and computer equipment. Background Art

[0002] With the rapid development of the power system, users have higher and higher requirements for power quality. For example, power quality problems such as three-phase imbalance, harmonics, and voltage fluctuations in the power grid have become the main factors affecting the reliability and stability of the power system. These problems not only hinder the normal operation of power equipment, but may also cause unstable grid voltage, equipment damage, and energy waste. To solve such problems, the power system introduces active power filters and static VAR compensators to overcome various power quality problems, which can well ensure power quality and improve the stability of the distribution network system.

[0003] However, existing power quality module devices have a single function and often require multiple devices to cooperate with each other, resulting in high costs and low efficiency, making it difficult to comprehensively address various power quality issues. In addition, existing power quality module devices are difficult to operate and maintain, which will increase additional maintenance costs and further increase the operating load of the power grid.

[0004] Therefore, the current power quality control technology has the problem of low power quality control efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide a V2G-based power quality control method, device, computer equipment, computer-readable storage medium and computer program product that can improve the control efficiency of power quality in response to the above technical problems.

[0006] In a first aspect, an embodiment of the present application provides a V2G-based power quality control method. The method comprises:

[0007] Acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0008] Acquire grid operation information of a target grid; the target grid is a grid used to supply power to the charging pile, and the grid operation information is used to characterize the operation state of the target grid;

[0009] Determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0010] When the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

[0011] In one embodiment, the charging and discharging information includes vehicle charging and discharging state information and power information of the energy storage battery; after the step of acquiring the charging and discharging information of the target vehicle collected by each charging pile, the method further includes:

[0012] When the vehicle charging and discharging status information indicates that the vehicle is in a discharging state, controlling the target power grid to charge the energy storage battery of the charging pile;

[0013] When the power information of the energy storage battery of the charging pile indicates that the current power value is greater than the preset power value, the target power grid is controlled to charge the target vehicle connected to the charging pile.

[0014] In one embodiment, the step of acquiring the charging and discharging information of the target vehicle collected by each charging pile includes:

[0015] Obtaining charging and discharging information of the target vehicle sent by an edge terminal connected to a dispatch center;

[0016] The charging and discharging information is collected by the charging pile, and the charging pile is used to send the collected charging and discharging information to the target vehicle, and the target vehicle is used to send the received charging and discharging information to the edge terminal.

[0017] In one embodiment, the quality evaluation index value includes a current harmonic index value, the power grid management module includes a harmonic management module, and when the quality evaluation index value exceeds a preset index threshold, the quality control function of the power grid management module is started, including:

[0018] When the current harmonic index value is greater than the first index threshold, the current control function of the harmonic control module is started.

[0019] In one embodiment, the quality evaluation index value includes a three-phase imbalance index value, the power grid management module includes a three-phase imbalance management module, and when the quality evaluation index value exceeds a preset index threshold, starting the quality control function of the power grid management module includes:

[0020] When the three-phase imbalance index value is greater than the second index threshold, the balance control function of the three-phase imbalance management module is started.

[0021] In one embodiment, the quality evaluation index value includes a voltage fluctuation index value, the power grid management module includes a voltage fluctuation management module, and when the quality evaluation index value exceeds a preset index threshold, starting a quality control function of the power grid management module includes:

[0022] When the voltage fluctuation index value is greater than a third index threshold, a voltage control function of the voltage fluctuation management module is started.

[0023] In a second aspect, the present application also provides a V2G-based power quality control device. The device comprises:

[0024] A charging and discharging information acquisition module is used to acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0025] A power grid operation information acquisition module, used to acquire power grid operation information of a target power grid; the target power grid is a power grid used to supply power to the charging pile, and the power grid operation information is used to characterize the operation state of the target power grid;

[0026] A quality evaluation index value determination module, used to determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0027] The power grid management module startup module is used to start the quality control function of the power grid management module when the quality evaluation index value exceeds the preset index threshold.

[0028] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0029] Acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0030] Acquire grid operation information of a target grid; the target grid is a grid used to supply power to the charging pile, and the grid operation information is used to characterize the operation state of the target grid;

[0031] Determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0032] When the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

[0033] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0034] Acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0035] Acquire grid operation information of a target grid; the target grid is a grid used to supply power to the charging pile, and the grid operation information is used to characterize the operation state of the target grid;

[0036] Determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0037] When the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

[0038] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0039] Acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0040] Acquire grid operation information of a target grid; the target grid is a grid used to supply power to the charging pile, and the grid operation information is used to characterize the operation state of the target grid;

[0041] Determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0042] When the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

[0043] The above-mentioned V2G-based power quality control method, device, computer equipment, storage medium and computer program product, for charging piles with the function of bidirectional energy flow from vehicle to power grid, first obtains the charging and discharging information of the electric vehicle connected to it, and then obtains the operation information of the target power grid, and then determines the quality evaluation indicators such as current harmonics, three-phase imbalance and voltage fluctuation based on the above information. When these indicators exceed the preset thresholds, the corresponding governance module is automatically started for regulation; to ensure the stability and reliability of power grid operation, be able to timely discover and manage power grid quality problems, improve power grid operation efficiency and power utilization, and improve the control efficiency of power quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 1 is a flow chart of a V2G-based power quality control method in an embodiment;

[0046] Figure 2 is a flow chart of a V2G-based power quality control method in another embodiment;

[0047] Figure 3 is a control block diagram of power quality in one embodiment;

[0048] Figure 4 is an example flow chart of a power grid management process in an embodiment;

[0049] Figure 5 A schematic diagram of a three-phase unbalance waveform of a power grid voltage under a disturbance environment before treatment in an embodiment;

[0050] Figure 6 A schematic diagram of a three-phase unbalance waveform of a power grid voltage under a disturbance environment after control in an embodiment;

[0051] Figure 7 A schematic diagram of a grid current waveform in a disturbance environment before treatment in an embodiment;

[0052] Figure 8 A schematic diagram of a simulated waveform of a power grid current under a disturbance environment after treatment in an embodiment;

[0053] Fig. 9 A schematic diagram of a voltage waveform in a disturbance environment before treatment in an embodiment;

[0054] Fig.10 A schematic diagram of a voltage waveform under a disturbance environment after treatment in an embodiment;

[0055] Fig.11 is a structural block diagram of a V2G-based power quality control device in one embodiment;

[0056] Fig.12 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0059] In one embodiment, Figure 1 As shown, a V2G-based power quality control method is provided. This embodiment uses the method applied to a terminal as an example for illustration. It can be understood that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0060] S101, acquiring charging and discharging information of a target vehicle collected by each charging pile.

[0061] Among them, the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working status of the target vehicle during charging and discharging at the charging pile.

[0062] For example, the charging and discharging information may include the charging status of the charging vehicle, the battery power, the expected power, the rated charging power, and other information.

[0063] S102, obtaining grid operation information of the target grid.

[0064] The target power grid is a power grid used to supply power to the charging pile, and the power grid operation information is used to characterize the operation status of the target power grid. For example, the power grid operation information may include power grid frequency, voltage, current harmonics, etc.

[0065] S103, determining various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information.

[0066] Among them, the quality evaluation index values ​​can be current harmonic index values, three-phase unbalance index values ​​and voltage fluctuation index values. Specifically, the current harmonic index value is used to measure the degree of distortion of the current waveform. High harmonic distortion may cause equipment overheating and reduced efficiency, affecting the quality of power. The three-phase imbalance index value is used to reflect the balance of the loads of each phase in the power system. A high three-phase imbalance will lead to increased equipment losses and abnormal heating, reducing power supply reliability. The voltage fluctuation index value is used to measure the voltage change amplitude within a given time. Excessive voltage fluctuations may cause electrical equipment malfunctions and affect the normal operation of the equipment.

[0067] Exemplarily, step S103 uses the collected data to calculate the values ​​of various quality evaluation indicators. By combining the charging and discharging information with the grid operation information, quality indicators such as current harmonics, three-phase imbalance and voltage fluctuation can be more accurately calculated, so as to timely identify and manage potential grid problems and ensure the stable and efficient operation of the grid.

[0068] S104, when the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

[0069] Exemplarily, in steps S103 and 104, the V2G charger collects the EV charging status, battery power, expected power, and rated charging power and uploads them; collects and analyzes data such as grid frequency, voltage, and current harmonics; when collecting grid voltage, current, frequency, harmonics, and three-phase imbalance data, if the current harmonics are greater than 5%, the three-phase imbalance is greater than 2%, and the voltage fluctuation is greater than ±7%, the harmonic control module, the three-phase imbalance control module, and the voltage fluctuation control module are started for processing.

[0070] In the above-mentioned V2G-based power quality control method, for charging piles with the function of bidirectional energy flow from vehicle to grid, the charging and discharging information of the electric vehicles connected thereto is first obtained, and then the operation information of the target grid is obtained, and then based on the above information, quality evaluation indicators such as current harmonics, three-phase imbalance and voltage fluctuation are determined. When these indicators exceed the preset thresholds, the corresponding governance module is automatically started for regulation; to ensure the stability and reliability of grid operation, to be able to timely discover and manage grid quality problems, to improve grid operation efficiency and power utilization, and to improve the control efficiency of power quality.

[0071] In one embodiment, after the step of acquiring the charging and discharging information of the target vehicle collected by each charging pile, the method further includes: when the vehicle charging and discharging status information indicates that the vehicle is in a discharging state, controlling the target power grid to charge the energy storage battery of the charging pile; when the power information of the energy storage battery of the charging pile indicates that the current power value is greater than a preset power value, controlling the target power grid to charge the target vehicle connected to the charging pile.

[0072] The charge and discharge information includes the vehicle charge and discharge status information and the power information of the energy storage battery. The preset power value can be the total power value, or it can be set and adjusted according to the actual situation.

[0073] For example, the dispatch center and edge terminals can realize the stable operation of the V2G system and the energy storage system, and no reverse power is sent to the grid. According to the usage requirements, the following system working modes can be realized: when the electric vehicle is discharged, the energy storage battery is charged; when the energy storage battery has sufficient capacity, the electric vehicle is charged.

[0074] In this embodiment, the charging and discharging information of the target vehicle is first collected through the charging pile, including the charging and discharging status of the vehicle and the power information of the energy storage battery. When the vehicle is in a discharging state, the system will control the target power grid to charge the energy storage battery of the charging pile; when the current power of the energy storage battery is greater than the preset power value, the system will control the target power grid to charge the connected electric vehicle; this solution enables the electric vehicle and the energy storage system to flexibly switch working modes according to actual needs, improve the utilization efficiency of electric energy, help balance the load of the power grid, optimize the operation of the power grid, reduce the operating cost of the power system, and improve the power supply safety and reliability of the power grid.

[0075] In one embodiment, acquiring the charging and discharging information of the target vehicle collected by each charging pile includes: acquiring the charging and discharging information of the target vehicle sent by an edge terminal connected to the dispatching center;

[0076] Among them, the charging and discharging information is collected by the charging pile, and the charging pile is used to send the collected charging and discharging information to the target vehicle, and the target vehicle is used to send the received charging and discharging information to the edge terminal.

[0077] Exemplarily, the dispatching center of the target power grid is communicatively connected to the edge terminal, the edge terminal is communicatively connected to the electric vehicle, and the electric vehicle is communicatively connected to the charging pile, thereby realizing signal interaction and command distribution between the charging pile and the dispatching center, thereby facilitating the target power grid to regulate the power grid according to the information collected by the charging pile.

[0078] In this embodiment, the system collects the charging and discharging information of the target vehicle through the charging pile and sends it to the edge terminal connected to the dispatch center; the edge terminal is responsible for receiving the information collected by the charging pile and forwarding it to the dispatch center to realize centralized information processing and decision-making; the communication connection between the target vehicle and the charging pile ensures that the vehicle can feedback the charging and discharging status in real time, and the charging pile is responsible for cataloging this information and sending it to the edge terminal, thereby establishing an efficient information interaction mechanism between the charging pile, the edge terminal and the dispatch center. This solution improves the control capability of the target power grid, enabling the power grid to dynamically adjust the load according to the real-time charging and discharging information, thereby realizing the intelligence and flexibility of power grid operation, optimizing the allocation of power resources, improving the efficiency of power utilization, and enhancing the safety and stability of the power grid.

[0079] In one embodiment, the quality evaluation index value includes a current harmonic index value, and the power grid management module includes a harmonic management module. When the quality evaluation index value exceeds a preset index threshold, the quality control function of the power grid management module is started, including:

[0080] When the current harmonic index value is greater than the first index threshold, the current control function of the harmonic control module is started.

[0081] The first indicator threshold may be 5%. For example, if the current harmonic is greater than 5%, the harmonic control module is started.

[0082] In this implementation scheme, the system sets quality evaluation index values, including current harmonic index values. When it is detected that the current harmonic index value exceeds the preset first index threshold, for example, greater than 5%, the system will immediately start the quality control function of the power grid management module. In this case, the harmonic management module will activate the current control function to reduce the current harmonic level and ensure the stability and power quality of the power grid operation. This process can achieve rapid response and automated management by real-time monitoring of current harmonic changes and dynamically adjusting current management measures.

[0083] This embodiment can effectively control current harmonics, optimize power quality, reduce losses and heat generation of power equipment, extend equipment service life, and improve power supply reliability of the power grid, thereby promoting healthy operation and sustainable development of the power system.

[0084] In one embodiment, the quality evaluation index value includes a three-phase imbalance index value, and the power grid management module includes a three-phase imbalance management module. When the quality evaluation index value exceeds a preset index threshold, the quality control function of the power grid management module is started, including:

[0085] When the three-phase imbalance index value is greater than the second index threshold, the balance control function of the three-phase imbalance management module is started.

[0086] Among them, the second indicator threshold can be 2%. For example, if the three-phase imbalance is greater than 2%, the three-phase imbalance control module is started.

[0087] In this implementation, the system sets a quality evaluation index value, including a three-phase imbalance index value. When the index value exceeds a preset second index threshold, for example, greater than 2%, the system will start the quality control function of the power grid management module. This process first monitors the three-phase imbalance in real time. When it is detected that the imbalance exceeds the standard, the system will activate the balance control function of the three-phase imbalance management module to adjust the current of each phase to achieve balanced distribution of the three-phase load.

[0088] In this embodiment, this automated management method can quickly respond to changes in the operating status of the power grid, effectively suppress the adverse effects of three-phase imbalance, significantly reduce the three-phase imbalance, improve the operating efficiency of the power system, reduce equipment losses and failure rates, and improve the quality of electric energy, thereby ensuring the safe and stable operation of the power grid and promoting the efficient use and sustainable development of power resources.

[0089] In one embodiment, the quality evaluation index value includes a voltage fluctuation index value, and the power grid management module includes a voltage fluctuation management module. When the quality evaluation index value exceeds a preset index threshold, a quality control function of the power grid management module is started, including:

[0090] When the voltage fluctuation index value is greater than the third index threshold, the voltage control function of the voltage fluctuation management module is started.

[0091] Among them, the third indicator threshold can be ±7%. For example, if the voltage fluctuation is greater than ±7%, the voltage fluctuation control module is started.

[0092] In this implementation, the system sets quality evaluation index values, including voltage fluctuation index values. When the voltage fluctuation index value exceeds the preset third index threshold, that is, exceeds plus or minus 7%, the grid management module will start the quality control function. The system monitors the voltage fluctuation in real time, and once it finds that it exceeds the standard, it automatically activates the voltage control function of the voltage fluctuation management module.

[0093] This embodiment adjusts the output of the power supply equipment, enhances voltage stability, reduces the impact of voltage fluctuations on power equipment and users, improves power quality, reduces equipment operation risks, and extends equipment service life, thereby ensuring the safe and stable operation of the power grid, promoting the efficiency and sustainable development of the power system, and improving user satisfaction and the reliability of power services.

[0094] In another embodiment, Figure 2 As shown, a V2G-based power quality control method is provided, comprising the following steps:

[0095] S201, obtaining charging and discharging information of a target vehicle sent by an edge terminal connected to a dispatching center.

[0096] S202, when the vehicle charging and discharging status information indicates that the vehicle is in a discharging state, controlling the target power grid to charge the energy storage battery of the charging pile.

[0097] S203, when the power information of the energy storage battery of the charging pile indicates that the current power value is greater than the preset power value, control the target power grid to charge the target vehicle connected to the charging pile.

[0098] S204, obtaining grid operation information of the target grid.

[0099] S205, determining various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information.

[0100] S206: When the current harmonic index value is greater than the first index threshold, start the current control function of the harmonic control module.

[0101] S207, when the three-phase imbalance index value is greater than the second index threshold, start the balance control function of the three-phase imbalance management module.

[0102] S208: When the voltage fluctuation index value is greater than the third index threshold, start the voltage control function of the voltage fluctuation management module.

[0103] It should be noted that the specific definitions of the above steps can be found in the specific definitions of a V2G-based power quality control method mentioned above, which will not be repeated here.

[0104] In the existing technology, electric vehicles are an important demand-side load. Orderly guidance of electric vehicle charging behavior can avoid distribution network line overload and power quality degradation caused by disorderly charging. It can also smooth out the peak and valley differences in grid load, reduce network losses, participate in frequency regulation, smooth out fluctuations in renewable energy, and improve the operating efficiency of the grid.

[0105] The charging pile with V2G (Vehicle to Grid) function is the carrier for the two-way flow of energy between electric vehicles and the power grid. At this time, the charging pile has the function of charging the electric vehicle battery and should also have the ability to feed back energy to the power grid. Under the V2G architecture, electric vehicles have both the source and load attributes, overcoming the limitations of "two-way communication and one-way energy transmission" between traditional power sources and power grids. With the characteristics of "two-way communication and two-way energy transmission", it benefits both the power grid side and the user side at the same time, achieving comprehensive advantages such as stabilizing the power grid load, improving the consumption of renewable energy, improving the economic benefits of users, and reducing network losses. This technology not only improves the energy utilization efficiency of electric vehicles, but also provides a new solution to improve the power quality problem of the power grid.

[0106] Through powerful communication and control functions, V2G charging piles can monitor the power quality of the power grid in real time and adjust the charging and discharging behavior of electric vehicles according to actual needs. For example, when the power grid experiences voltage fluctuations or excessive harmonics, V2G charging piles can quickly change the charging strategy of electric vehicles, or even use them as energy storage devices to provide reactive power compensation and harmonic suppression for the power grid, thereby helping the grid to restore stability.

[0107] However, existing power quality module devices have single functions and often require multiple devices to cooperate with each other, resulting in high costs and low efficiency, making it difficult to comprehensively address various power quality issues. Existing power quality module devices are difficult to operate and maintain, which will increase additional maintenance costs and further increase the operating load of the power grid.

[0108] Based on this, the present application embodiment provides a V2G-based power quality control method, as shown below: Figures 3 to 10 , a V2G-based power quality control method is described in detail with a specific embodiment. It is worth noting that the following description is only an exemplary description and not a specific limitation to the application.

[0109] The V2G-based power quality control method provided in this application corresponds to a control system that improves the power quality of a charging station, realizes electric vehicle-friendly access to a local distribution network, and the structure of the power quality control system is as follows: Figure 3 As shown in the figure, the system is mainly composed of low-voltage power distribution, voltage sampling transformer, current sampling transformer, dispatching center, edge terminal, V2G charger and other parts.

[0110] The power quality control system realizes the stable operation of the V2G system and the energy storage system through the dispatch center and edge terminals, and does not send power back to the grid. According to the use requirements, the following system working modes can be realized: when the electric vehicle is discharged, the energy storage battery is charged; when the energy storage battery has sufficient capacity, the electric vehicle is charged.

[0111] In a power quality control system provided in the present application, the edge terminal and the V2G charging pile with integrated power quality management device can be designed with a diversified communication platform for compact communication access, covering multiple communication methods and corresponding plug-and-play standard interfaces, and can use RS485, RS232, WIFI, Bluetooth and other communication methods for reliable communication connection.

[0112] The present application provides a power quality control system that can receive dispatch instructions from a superior dispatch center, perform edge computing, communicate with multiple charging piles in a charging station area to exchange information, coordinate and optimize the allocation of active power and reactive power based on information such as the operating status of the charging piles and the remaining battery power, and issue power control instructions.

[0113] In a power quality control system provided in the present application, the communication protocol between the edge terminal and the charging pile, the main communication data includes but is not limited to local electric vehicle battery information, charging user charging mode setting information, charging pile power quality management information, power control information, etc.;

[0114] Specifically, the implementation of the power quality control system relies on the following steps:

[0115] Step 1: The edge terminal receives the frequency and peak regulation instructions from the upper level; it receives the EV (Electric Vehicle) charging status, battery power and other information uploaded by multiple charging piles in the receiving station area and performs analysis and calculation, distributes the peak and frequency regulation instructions, and coordinates and controls the various charging piles in the charging station area in a unified manner; and displays the charging station-pile operation information.

[0116] Step 2: The V2G charger collects and uploads the EV charging status, battery power, expected power, and rated charging power; collects and analyzes data such as grid frequency, voltage, and current harmonics; performs power quality management, peak and frequency regulation, etc.; and receives frequency and peak regulation instructions.

[0117] Step 3: When collecting data such as grid voltage, current, frequency, harmonics, and three-phase imbalance, if the current harmonic is greater than 5%, the three-phase imbalance is greater than 2%, and the voltage fluctuation is greater than ±7%, start the harmonic control module, the three-phase imbalance control module, and the voltage fluctuation control module for processing.

[0118] The details of the governance process include Figure 3 shown.

[0119] Step 4: Feedback the actual control results in real time to ensure the reliable operation of the entire system.

[0120] In order to verify the operation effect of the power quality control system corresponding to the power quality control method based on V2G provided in this application, simulation verification is required. Specifically, the following simulation is built in the MATLAB simulation software: Figure 3 The simulation circuit shown in the figure has the following simulation results: Figures 5 to 10 shown.

[0121] in, Figure 5 and Figure 6 The comparison of the three-phase imbalance of the V2G power quality module device is shown. Figure 5 This is the three-phase unbalance waveform of the grid voltage under the disturbance environment before the treatment of this application. Figure 6 This is the waveform of the three-phase imbalance of the power grid voltage under the disturbance environment after the treatment in this application. After adding the three-phase imbalance treatment module, the three-phase imbalance of the voltage is less than 2% after treatment, and the treatment effectiveness is 22.81%.

[0122] Figure 7 and Figure 8 The comparison of harmonics of V2G power quality module devices is shown. Figure 7 This is the grid current waveform under the disturbance environment before the treatment of this application. Figure 8 This is the simulated waveform of the grid current under the disturbance environment after the treatment of this application. After adding the harmonic control module, the current harmonics are all below 5%, with strong rapidity and robustness.

[0123] Fig. 9 and Fig.10 The comparison of voltage fluctuations of V2G power quality module devices is shown. Fig. 9 This is the voltage waveform under the disturbance environment before the treatment of this application. Fig.10 This is the voltage waveform under the disturbance environment after the treatment in this application. After adding the voltage fluctuation compensation module, the voltage fluctuation after treatment is below ±7%, and the treatment effectiveness is 31.87%.

[0124] Compared with the prior art, the present application provides a power quality module device system corresponding to the V2G-based power quality control method, including a dispatching center, an edge terminal, a V2G charger and other types of equipment. The device has diverse functions and can solve various power quality problems; improve the autonomy of the local distribution network, realize the coordinated operation of regional decentralized resources, effectively reduce the distribution network operation cost, and improve the power quality; by adjusting the load balance and adjusting the power release of electric vehicles, the load is further balanced, the pressure on the power grid load is relieved, and the power is balanced; by adjusting the charging and discharging strategies of electric vehicles, the harmonic interference of the distribution network is effectively suppressed and the content of the power grid harmonics is adjusted; by feeding the electricity of electric vehicles back to the power grid, the fluctuation of the power grid voltage is adjusted.

[0125] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a V2G-based power quality control device for implementing the V2G-based power quality control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more V2G-based power quality control device embodiments provided below can refer to the limitations of the V2G-based power quality control method above, and will not be repeated here.

[0127] In one embodiment, Fig.11 As shown, a V2G-based power quality control device is provided, including: a charging and discharging information acquisition module 1101, a power grid operation information acquisition module 1102, a quality evaluation index value determination module 1103, and a power grid management module startup module 1104, wherein:

[0128] The charging and discharging information acquisition module 1101 is used to acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile;

[0129] The power grid operation information acquisition module 1102 is used to acquire the power grid operation information of the target power grid; the target power grid is a power grid used to supply power to the charging piles, and the power grid operation information is used to characterize the operation status of the target power grid;

[0130] The quality evaluation index value determination module 1103 is used to determine the quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information;

[0131] The power grid management module startup module 1104 is used to start the quality control function of the power grid management module when the quality evaluation index value exceeds the preset index threshold.

[0132] In one embodiment, the device is used to: when the vehicle charging and discharging status information indicates that the vehicle is in a discharging state, control the target power grid to charge the energy storage battery of the charging pile; when the power information of the energy storage battery of the charging pile indicates that the current power value is greater than a preset power value, control the target power grid to charge the target vehicle connected to the charging pile.

[0133] In one embodiment, the device is used to obtain charging and discharging information of a target vehicle sent by an edge terminal connected to a dispatching center.

[0134] In one embodiment, the device is used to: when the current harmonic index value is greater than a first index threshold, start the current control function of the harmonic control module.

[0135] In one embodiment, the device is used to: when the three-phase imbalance index value is greater than a second index threshold, start the balance control function of the three-phase imbalance management module.

[0136] In one embodiment, the device is used to: when the voltage fluctuation index value is greater than a third index threshold, start the voltage control function of the voltage fluctuation management module.

[0137] Each module in the above-mentioned V2G-based power quality control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0138] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.12As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a V2G-based power quality control method is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0139] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0140] In one embodiment, a computer device includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps in the above method embodiments are implemented.

[0141] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0142] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0143] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0144] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A V2G-based power quality control method, characterized in that: The method comprises: Acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile; Acquire grid operation information of a target grid; the target grid is a grid used to supply power to the charging pile, and the grid operation information is used to characterize the operation state of the target grid; Determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information; When the quality evaluation index value exceeds the preset index threshold, the quality control function of the power grid management module is started.

2. The method according to claim 1, characterized in that The charging and discharging information includes vehicle charging and discharging state information and power information of the energy storage battery; after the step of acquiring the charging and discharging information of the target vehicle collected by each charging pile, the method further includes: When the vehicle charging and discharging status information indicates that the vehicle is in a discharging state, controlling the target power grid to charge the energy storage battery of the charging pile; When the power information of the energy storage battery of the charging pile indicates that the current power value is greater than the preset power value, the target power grid is controlled to charge the target vehicle connected to the charging pile.

3. The method according to claim 1, characterized in that The acquiring of the charging and discharging information of the target vehicle collected by each charging pile includes: Obtaining charging and discharging information of the target vehicle sent by an edge terminal connected to a dispatch center; The charging and discharging information is collected by the charging pile, and the charging pile is used to send the collected charging and discharging information to the target vehicle, and the target vehicle is used to send the received charging and discharging information to the edge terminal.

4. The method according to claim 1, characterized in that: The quality evaluation index value includes a current harmonic index value, the power grid governance module includes a harmonic governance module, and when the quality evaluation index value exceeds a preset index threshold, starting a quality control function of the power grid governance module includes: When the current harmonic index value is greater than the first index threshold, the current control function of the harmonic control module is started.

5. The method according to claim 1, characterized in that The quality evaluation index value includes a three-phase imbalance index value, the power grid management module includes a three-phase imbalance management module, and when the quality evaluation index value exceeds a preset index threshold, starting a quality control function of the power grid management module includes: When the three-phase imbalance index value is greater than the second index threshold, the balance control function of the three-phase imbalance management module is started.

6. The method according to claim 1, characterized in that The quality evaluation index value includes a voltage fluctuation index value, the power grid governance module includes a voltage fluctuation governance module, and when the quality evaluation index value exceeds a preset index threshold, starting a quality control function of the power grid governance module includes: When the voltage fluctuation index value is greater than a third index threshold, a voltage control function of the voltage fluctuation management module is started.

7. A V2G-based power quality control device, characterized in that: The device comprises: A charging and discharging information acquisition module is used to acquire the charging and discharging information of the target vehicle collected by each charging pile; the charging pile is a charging pile with a bidirectional energy flow function from the vehicle to the power grid, the target vehicle is a vehicle that has a charging and discharging connection with the charging pile, and the charging and discharging information is information used to characterize the working state of the target vehicle in the charging pile; A power grid operation information acquisition module, used to acquire power grid operation information of a target power grid; the target power grid is a power grid used to supply power to the charging pile, and the power grid operation information is used to characterize the operation state of the target power grid; A quality evaluation index value determination module, used to determine various quality evaluation index values ​​corresponding to the target power grid according to the charging and discharging information and the power grid operation information; The power grid management module startup module is used to start the quality control function of the power grid management module when the quality evaluation index value exceeds the preset index threshold.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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