Electric vehicle V2G charging pile supporting power grid frequency modulation and control system thereof

Abstract

The utility model discloses an electric vehicle V2G charging pile supporting power grid frequency modulation and a control system thereof, and belongs to the technical field of power grid frequency modulation, the electric vehicle V2G charging pile supporting power grid frequency modulation comprises a frequency modulation coordination device, a charging and discharging frequency modulation controller, a bidirectional power conversion unit and a charging gun; the frequency modulation coordination device is electrically connected with a sensor and is in communication connection with the charging and discharging frequency modulation controller; the charging and discharging frequency modulation controller is in communication connection with the bidirectional power conversion unit, and a charging and discharging power-frequency relation adjustment curve is built in the charging and discharging frequency modulation controller; according to the utility model, the demand that the electric automobile participates in the frequency modulation of the power grid can be met, the stability of the power grid is met, the owner of the electric automobile and the charging operator can obtain additional benefits, and the response quality of the electric automobile in the process of participating in the frequency modulation of the power grid can be ensured; and charging and discharging power dynamic adjustment under a unified transformer node is satisfied.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power grid frequency modulation technology especially relates to a kind of electric vehicle V2G charging pile of supporting power grid frequency modulation and control system thereof. BACKGROUND

[0002] With the increasing of new energy installation scale, the "double high" characteristics in power system are increasingly highlighted, "double high" is high proportion of renewable energy, high proportion of power electronic equipment. Frequency is the most important safety and stability index of power system, and frequency instability will directly affect the power grid safety and user production efficiency. The intermittency of high installation proportion wind power and photovoltaic generator unit output also increases the frequency modulation burden of power grid. With the increasing of photovoltaic wind power generation proportion, superimposed with the fluctuation of power load, the frequency modulation demand of power grid is more and more.

[0003] The main frequency adjustment method of power system mainly includes adjusting system power and carrying out load management.

[0004] With the increasing of electric vehicle charging and discharging power and single vehicle storage capacity, vehicle-to-grid technology develops rapidly, vehicle-to-grid, vehicle to grid, the mobile energy storage characteristics of electric vehicle can provide certain adjustment capacity for power system frequency stability, but at present, the technology of electric vehicle participating in power grid frequency modulation is still a technical blank.

[0005] At present, electric vehicle charging pile, V2G bidirectional charging and discharging pile has not been optimized for power grid frequency modulation, and there is no related technical scheme, and the typical system architecture of current charging pile control system is as shown in Figure 1 The system architecture is composed of charging operation platform, charging pile, power distribution system and electric vehicle. INVENTION CONTENTS

[0006] In order to solve the problems in the prior art, the utility model provides a kind of electric vehicle V2G charging pile of supporting power grid frequency modulation and control system to solve the technical problems that the prior art has not been optimized for power grid frequency modulation.

[0007] The utility model adopts the following technical solutions.

[0008] The first aspect of the application discloses an electric vehicle V2G charging pile supporting power grid frequency modulation, comprising: a frequency modulation coordination device, a charging and discharging frequency modulation controller, a bidirectional power conversion unit and a charging gun.

[0009] The frequency modulation coordination device is electrically connected with a sensor, and the frequency modulation coordination device is in communication connection with the charging and discharging frequency modulation controller.

[0010] The charge-discharge frequency controller is in communication connection with the bidirectional power conversion unit, and the charge-discharge frequency controller is internally provided with a charge-discharge power-frequency relationship adjustment curve.

[0011] The charging gun is in electrical connection with the bidirectional power conversion unit.

[0012] As an improvement, the sensor is placed outside the frequency modulation coordination device or integrated inside the frequency modulation coordination device.

[0013] As an improvement, the frequency modulation coordination device is in communication connection with the charge-discharge frequency controller through the setting of a field bus.

[0014] As an improvement, the charge-discharge frequency controller is in communication connection with the bidirectional power conversion unit through the setting of a field bus.

[0015] As an improvement, the frequency modulation coordination device is placed outside the charging pile or integrated inside the charging pile.

[0016] The second aspect of the present application discloses a V2G charging pile control system of an electric vehicle supporting grid frequency modulation, comprising: a power distribution system, a charging pile, an electric vehicle, a charging operation platform, a dispatching platform;

[0017] The power distribution system is in electrical connection with the bidirectional power conversion unit.

[0018] The charging gun of the charging pile is in electrical connection with the electric vehicle.

[0019] The charging operation platform is in communication connection with the charge-discharge frequency controller.

[0020] The dispatching platform is in communication connection with the frequency modulation coordination device.

[0021] As an improvement, a circuit breaker is electrically connected between the power distribution system and the bidirectional power conversion unit.

[0022] As an improvement, the dispatching platform and the frequency modulation coordination device are in wired or wireless communication connection.

[0023] As an improvement, a plurality of charging piles are arranged under one power supply area, and the frequency modulation coordination devices in the plurality of charging piles are in communication connection through the setting of a field bus.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] (1) The electric vehicle can participate in the frequency modulation of the power grid, and the electric vehicle owner and the charging operator can obtain additional benefits while meeting the stability of the power grid.

[0026] (2) The response quality of the electric vehicle in the process of participating in the frequency modulation of the power grid can be ensured, and the dynamic adjustment of the charge-discharge power under the unified transformer node can be met. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a system architecture diagram of the prior art;

[0028] Figure 2 is a first system architecture diagram of the utility model;

[0029] Figure 3 is a flow chart of the utility model responding to dispatching frequency modulation;

[0030] Figure 4 is a flow chart of the utility model autonomously participating in frequency modulation;

[0031] Figure 5 is a second system architecture diagram of the utility model.

[0032] 1, power distribution system; 2, charging pile; 3, charging controller; 4, power conversion unit; 5, electric vehicle; 6, charging operation platform; 7, dispatching platform; 8, frequency modulation coordination device; 9, charging and discharging frequency modulation controller; 11, charging gun; 12, circuit breaker. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. The embodiments described in the application are only a part of the embodiments of the utility model, not all embodiments. Based on the spirit of the utility model, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

[0034] Embodiment 1

[0035] As shown in Figure 2 A 5V2G charging pile 2 of electric vehicle supporting grid frequency modulation, comprising: frequency modulation coordination device 8, charging and discharging frequency modulation controller 9, bidirectional power conversion unit 4, charging gun 11.

[0036] The frequency modulation coordination device 8 is electrically connected with a sensor, and the frequency modulation coordination device 8 is in communication connection with the charging and discharging frequency modulation controller 9, for exchanging frequency, response instruction and other information, the frequency modulation coordination device 8 controls the charging and discharging frequency modulation controller 9 to carry out electric vehicle 5 discharging power control according to the instruction information issued by the grid by accepting the grid frequency modulation information of the dispatching platform 7.

[0037] The charging and discharging frequency modulation controller 9 is in communication connection with the bidirectional power conversion unit 4, for exchanging power control instructions, and the charging and discharging frequency modulation controller 9 is built-in charging and discharging power-frequency relationship adjustment curve, which can independently carry out power adjustment of charging and discharging according to the frequency of power supply;

[0038] The charging gun 11 is electrically connected with the bidirectional power conversion unit 4.

[0039] In the preferred but non-limiting embodiment of the present embodiment, the sensor is placed outside the frequency modulation coordination device 8 or integrated inside the frequency modulation coordination device 8 for monitoring the voltage, frequency and power of the power grid and the charging pile 2.

[0040] In the preferred but non-limiting embodiment of the present embodiment, the frequency modulation coordination device 8 is connected with the charging and discharging frequency modulation controller 9 through the field bus.

[0041] In the preferred but non-limiting embodiment of the present embodiment, the charging and discharging frequency modulation controller 9 is connected with the bidirectional power conversion unit 4 through the field bus.

[0042] As shown in Figure 2 , Figure 5 In the preferred but non-limiting embodiment of the present embodiment, the frequency modulation coordination device 8 is placed outside the charging pile 2 or integrated inside the charging pile 2, and if the frequency modulation coordination device 8 is placed outside the charging pile 2, all the charging and discharging frequency modulation controllers 9 are connected with the frequency modulation coordination device 8.

[0043] Embodiment 2

[0044] A control system of a 5V2G charging pile 2 of an electric vehicle 5 supporting power grid frequency modulation, based on embodiment 1, comprising: a power distribution system 1, a charging pile 2, an electric vehicle 5, a charging operation platform 6, a dispatching platform 7;

[0045] The power distribution system 1 is electrically connected with the bidirectional power conversion unit 4, and the power distribution system 1 is used for supplying power to the charging pile 2.

[0046] The charging gun 11 of the charging pile 2 is electrically connected with the electric vehicle 5, the charging pile 2 is used for power conversion from the power grid to the electric vehicle 5, charging process control and overvoltage and overcurrent state acquisition and protection, and the electric vehicle 5 is used for energy compensation and discharging.

[0047] The charging operation platform 6 is connected with the charging and discharging frequency modulation controller 9, and the charging operation platform 6 is used for developing charging operation and charging fee settlement.

[0048] The dispatching platform 7 is connected with the frequency modulation coordination device 8.

[0049] In the preferred but non-limiting embodiment of the present embodiment, the power distribution system 1 and the bidirectional power conversion unit 4 are electrically connected with the circuit breaker 12.

[0050] In the preferred but non-limiting embodiment of the present embodiment, the dispatching platform 7 and the frequency modulation coordination device 8 are connected with each other through wired or wireless communication.

[0051] Embodiment 3

[0052] Based on Embodiment 2, multiple charging piles 2 are arranged under one transformer area, the frequency modulation coordination devices 8 in the multiple charging piles 2 are connected in communication through the setting of field buses, the working states of each are transmitted through local communication, the coordinated control of the output power between different charging piles 2 is met, and the instruction following and power adjustment of the whole power grid access node are met.

[0053] After the charging operation platform 6 declares the frequency modulation transaction to the power transaction organization and succeeds in clearing, the charging operation platform 6 adjusts the operation plan according to the clearing result to attract users to connect the electric vehicles 5 with the charging and discharging equipment in the corresponding period, the dispatching platform 7 issues the frequency modulation calling information, the frequency modulation coordination device 8 accepts the frequency modulation instruction, and issues the discharging power, discharging period and other information to the charging and discharging frequency modulation controller 9, the charging and discharging frequency modulation controller 9 controls the bidirectional power conversion unit 4 to perform power control according to the instruction, dynamically judges whether the transformer node meets the overall frequency modulation power requirement in the frequency modulation process, and dynamically adjusts between different charging piles 2 until the frequency modulation ends.

[0054] The technical architecture and system of the electric vehicle charging and discharging device meeting the power grid frequency modulation demand are disclosed, the electric vehicle resources can develop power grid frequency modulation according to the power grid condition, the frequency modulation coordination device 8 is created on the traditional charging and discharging equipment, the frequency modulation coordination device 8 can monitor the power grid frequency, can control the charging and discharging controller to adjust the charging and discharging power according to the power grid frequency or dispatch, can communicate with the frequency modulation coordination devices 8 in the charging equipment under the same transformer, ensures that the frequency modulation response power under the transformer node meets the target requirement, and ensures the frequency modulation response quality.

[0055] Working principle:

[0056] As shown in Figure 3 the control system responds to the dispatch frequency modulation, the following steps are performed:

[0057] Step 1.1, the dispatching platform 7 issues the frequency modulation information;

[0058] Step 1.2, the frequency modulation coordination device 8 accepts the frequency modulation information;

[0059] Step 1.3, the frequency modulation coordination device 8 sends the power instruction to the charging and discharging frequency modulation controller 9;

[0060] Step 1.4, the charging and discharging frequency modulation controller 9 controls the bidirectional power conversion unit 4 to charge and discharge according to the instruction;

[0061] Step 1.5, the frequency modulation coordination device 8 judges whether the transformer node meets the frequency modulation power requirement, if the frequency modulation power requirement is not met, the frequency modulation coordination device 8 coordinates the discharge power, adjusts the power, and then returns to step 1.4, if the frequency modulation power requirement is met, step 1.6 is performed;

[0062] Step 1.6, the frequency modulation coordination device 8 judges whether the frequency modulation period is reached, if the frequency modulation period is not reached, it returns to step 1.4, if the frequency modulation period is reached, it charges and discharges until the end.

[0063] As shown in the figure, the control system autonomously participates in frequency modulation, and the following steps are performed: Figure 4

[0064] Step 2.1, the frequency modulation coordination device 8 detects frequency information;

[0065] Step 2.2, the frequency modulation coordination device 8 judges whether the frequency is normal, if the frequency is not normal, the power command is adjusted according to the preset charge-discharge power-frequency relationship adjustment curve and step 2.3 is performed, if the frequency is normal, step 2.3 is performed;

[0066] Step 2.3, charge and discharge according to the command;

[0067] Step 2.4, the frequency modulation coordination device 8 judges whether the electric vehicle 5 meets the charge-discharge condition, if the charge-discharge condition is not met, it returns to step 2.2, if the charge-discharge condition is met, it charges and discharges until the end.

[0068] The beneficial effects of the utility model lie in that, compared with the prior art,

[0069] (1) the demand of electric vehicles participating in frequency modulation of power grid can be met, the electric vehicle owner and the charging operator can obtain additional benefits while meeting the stability of the power grid.

[0070] (2) the response quality of the electric vehicle in the process of participating in frequency modulation of the power grid can be ensured, and the dynamic adjustment of charge-discharge power under the unified transformer node can be met.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the utility model can be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the utility model should be covered in the protection scope of the claims of the utility model.​

Claims

1. A V2G charging pile for electric vehicles supporting grid frequency regulation, characterized in that, The application relates to a frequency modulation coordination device, a charge-discharge frequency modulation controller, a bidirectional power conversion unit and a charging gun. The frequency modulation coordination device is electrically connected with a sensor, and the frequency modulation coordination device is in communication connection with the charge-discharge frequency modulation controller. The charge-discharge frequency modulation controller is in communication connection with the bidirectional power conversion unit, and the charge-discharge frequency modulation controller is internally provided with a charge-discharge power-frequency relationship adjustment curve. The charging gun is electrically connected with the bidirectional power conversion unit. The sensor is arranged outside the frequency modulation coordination device or integrated in the frequency modulation coordination device.

2. The electric vehicle V2G charging pile supporting grid frequency modulation according to claim 1, characterized in that, The frequency modulation coordination device is in communication connection with the charge-discharge frequency modulation controller through a field bus.

3. The electric vehicle V2G charging pile supporting grid frequency modulation according to claim 1, characterized in that, The charge-discharge frequency modulation controller is in communication connection with the bidirectional power conversion unit through a field bus.

4. The electric vehicle V2G charging pile supporting grid frequency modulation according to claim 1, characterized in that, The frequency modulation coordination device is arranged outside the charging pile or integrated in the charging pile.

5. The electric vehicle V2G charging pile supporting grid frequency modulation according to claim 1, characterized in that, The application relates to a power distribution system, a charging pile, an electric vehicle, a charging operation platform and a dispatching platform.

6. A V2G charging pile control system for supporting grid frequency modulation, based on the V2G charging pile for supporting grid frequency modulation in any one of claims 1-5, characterized in that, The power distribution system is electrically connected with the bidirectional power conversion unit. The charging gun of the charging pile is electrically connected with the electric vehicle. The charging operation platform is in communication connection with the charge-discharge frequency modulation controller. The dispatching platform is in communication connection with the frequency modulation coordination device. A circuit breaker is electrically connected between the power distribution system and the bidirectional power conversion unit. The dispatching platform and the frequency modulation coordination device are in wired or wireless communication connection.

7. The control system of the electric vehicle V2G charging pile supporting grid frequency modulation according to claim 6, characterized in that, A plurality of charging piles are arranged under one transformer area, and the frequency modulation coordination devices in the plurality of charging piles are in communication connection through a field bus.

8. The control system of electric vehicle V2G charging pile supporting grid frequency modulation according to claim 6, characterized in that, ​ 9. The control system of electric vehicle V2G charging pile supporting grid frequency modulation according to claim 6, characterized in that, ​

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