Control system and method for feeding electric energy of charging pile back to power grid

Abstract

The invention discloses a control system for feeding electric energy of a charging pile back to a power grid. An energy management system EMS comprises a first alternating current to direct current module AC / DC1, a second alternating current to direct current module AC / DC2, a first direct current to direct current module DC / DC1 and a second direct current to direct current module DC / DC2. The ECU comprises a relay; the charging control unit CCU comprises a battery pack and a charging gun B; a control method for feeding electric energy of a charging pile back to a power grid comprises the following steps that S1, an operator background sends a V2G starting instruction to a charging pile terminal Tbox, and the charging pile terminal Tbox uploads electric quantity information to the operator background; s2, the charging pile terminal Tbox sends a V2G request to an energy management system EMS, and the energy management system EMS uploads electric quantity information to the charging pile terminal Tbox; s3, the energy management system EMS starts a V2G instruction, and V2G power distribution is carried out; and S4, the operator and the power grid settle the electric quantity. The system has the advantages that the direct current double guns of the charging pile can store energy, and reasonable distribution of electric quantity resources is realized by referring to a market V2G scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a control system and method for feeding back electric energy from a charging pile to a power grid. Background Art

[0002] V2G (Vehicle-to-grid) technology can realize the two-way interaction of energy between the power grid and electric vehicles. In the traditional sense, the relationship between electric vehicles and the power grid is a one-way relationship, and electric vehicles obtain electricity from the power grid. Based on V2G technology, electric vehicles can not only obtain electricity from the power grid, but also feed back electricity to the power grid. For electric vehicle users, they can also charge when the electricity price is low, and feed back electricity to the power grid when the electricity price is high, which can create benefits for electric vehicle users and realize the rational use of energy.

[0003] Existing charging pile energy storage equipment can transmit electricity to the power grid, and DC charging piles can also directly charge electric vehicles, but they do not have the function of DC dual-gun energy storage.

[0004] With this in mind, the present invention proposes an intelligent license plate recognition charging pile, aiming to solve the above-mentioned problem, so that the DC dual guns of the charging pile can store energy, refer to the market V2G solution, and realize reasonable allocation of power resources. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a control system and method for feeding back the electric energy of a charging pile to a power grid.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted in the present invention is:

[0007] A control system for feeding back electric energy from a charging pile to a power grid, comprising:

[0008] Energy Management System EMS;

[0009] Electronic Control Unit ECU;

[0010] Charging control unit CCU;

[0011] The energy management system EMS includes an AC / DC1 module, an AC / DC2 module, a DC / DC1 module and a DC / DC2 module.

[0012] The electronic control unit ECU includes relays K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10;

[0013] The charging control unit CCU includes a battery pack 1 Pack1, a battery pack 2 Pack2, a charging gun GunA and a charging gun GunB;

[0014] The AC / DC1 and AC / DC2 input sides are connected in parallel and electrically connected to the three-phase AC meter AC Meter. The AC / DC1 and AC / DC2 output sides are electrically connected to the DC / DC1 and DC / DC2 input sides through relays K2 and K4, respectively. The DC / DC1 and DC / DC2 output sides are electrically connected to the charging gun GunA and the charging gun GunB through relays K3 and K5, respectively. The DC / DC1 output side is electrically connected to the battery pack Pack1 through relays K8 and K6. The DC / DC2 output side is electrically connected to the battery pack Pack2 through relays K9 and K7.

[0015] As an improvement, the power input sides of the AC / DC1 and AC / DC2 modules are electrically connected to a three-phase AC meter via a relay K1.

[0016] As an improvement, the output sides of the AC / DC1 and AC / DC2 modules are electrically connected via a relay K10.

[0017] A control method for feeding back electric energy from a charging pile to a power grid comprises the following steps:

[0018] S1. The operator backend sends a V2G start instruction to the charging pile terminal Tbox, and the charging pile terminal Tbox uploads power information to the operator backend;

[0019] S2. The charging pile terminal Tbox sends a V2G request to the energy management system EMS, and the energy management system EMS uploads power information to the charging pile terminal Tbox;

[0020] S3, the energy management system EMS starts the V2G instruction and distributes power to V2G;

[0021] S4. Operators and power grids settle electricity consumption.

[0022] As an improvement, the operator backend is connected to the charging pile terminal Tbox signal via the 4G network, the charging pile terminal Tbox is connected to the energy management system EMS signal via Ethernet, and the energy management system EMS communicates internally via the CAN bus.

[0023] As an improvement, the charging pile terminal Tbox in S2 requests the energy management system EMS to enter V2G at 9:00-11:00am and 14:00-16:00pm every day, and sends the requested power size Pkw to the energy management system EMS.

[0024] As an improvement, the conditions for the energy management system EMS in S3 to start V2G specifically include that the three-phase line is online, the battery SOC is greater than 50%, the system is in a high voltage state, the charging pile system fault level is low, and a Tbox request is received.

[0025] Compared with the traditional technology, the advantages of the present invention are:

[0026] The DC dual guns of the charging pile can store energy and realize the reasonable allocation of power resources. The energy management system EMS can collect the power supplied to the power grid at all times, and then transmit the power to TBOX via Ethernet. TBOX transmits it to the background via 4G. The background and the operator communicate through 4G, and the operator and the power grid settle the power. The operator and the power grid company have signed a power contract, so the relevant power settlement can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the system principle of the present invention;

[0028] Figure 2 It is a schematic diagram of the V2G control flow of the present invention;

[0029] Figure 3 is a schematic diagram summarizing power distribution of the present invention;

[0030] Figure 4 is a power allocation flow chart of the present invention; DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0032] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0033] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Example

[0035] Combined with Figure 1 ,

[0036] The charging control unit CCU includes a battery pack 1 Pack1, a battery pack 2 Pack2, a charging gun GunA and a charging gun GunB;

[0037] The AC / DC1 and AC / DC2 inlet sides are connected in parallel and electrically connected to the three-phase AC meter AC Meter. The AC / DC1 and AC / DC2 outlet sides are electrically connected to the DC / DC1 and DC / DC2 inlet sides through relays K2 and K4, respectively. The DC / DC1 and DC / DC2 outlet sides are electrically connected to the charging gun GunA and the charging gun GunB through relays K3 and K5, respectively. The DC / DC1 outlet side is electrically connected to the battery pack Pack1 through relays K8 and K6. The DC / DC2 outlet side is electrically connected to the battery pack Pack2 through relays K9 and K7.

[0038] The AC / DC1 and AC / DC2 power input sides are electrically connected to the three-phase AC meter via a relay K1.

[0039] The output sides of the AC / DC1 and AC / DC2 modules are electrically connected via a relay K10.

[0040] When system A turns on V2G,

[0041] The signal direction is battery pack Pack 1, relay K6 closed, relay K2 closed, AC / DC1 module, relay K1 closed, three-phase AC meter, and three-phase power grid.

[0042] When system B turns on V2G,

[0043] The signal direction is battery pack Pack 2, relay K7 closed, relay K4 closed, AC / DC2, relay K1 closed, three-phase AC meter, and three-phase power grid.

[0044] When charging online in a three-phase grid,

[0045] The current flow is three-phase grid, three-phase AC meter, relay K1 closed, AC / DC1 module, relay K2 closed, relay K8 closed, relay K3 closed, charging gun GUN A.

[0046] When the three-phase grid is not online for charging, the current flows to battery pack Pack 1, relay K6 is closed, DC / DC1 is connected to the DC converter, relay K3 is closed, and charging gun GUN A is connected.

[0047] Combined with Figure 2 , V2G start process

[0048] The charging pile terminal Tbox receives the operator's command signal through 4G communication and remotely activates the V2G function.

[0049] Charging pile terminal Tbox requests V2G conditions:

[0050] Time: 9:00-11:00am. 14:00-16:00pm.

[0051] Request power Pkw.

[0052] The charging pile terminal Tbox requests the energy management system EMS to enter V2G every day from 9:00 to 11:00am and 14:00 to 16:00pm, and sends the requested power size Pkw to EMS.

[0053] Energy management system EMS starts V2G conditions:

[0054] The three-phase line is online, which means that relay K1 is closed;

[0055] Battery SOC is greater than 50%;

[0056] The system is in high voltage state, ensuring that the AC / DC converter can perform the V2G function. If it is not in high voltage state, the AC / DC converter will not start and the V2G function cannot be performed.

[0057] The fault level of the charging pile system is low. If the fault level is high, the system will be under high voltage, or the related relay switch cannot be closed;

[0058] The energy management system EMS starts V2G only after receiving the request from Tbox to start V2G.

[0059] Combined with Figure 3-4 , V2G allocated power

[0060] FacA=0.43WA+0.33XA+0.16YA+0.8ZA

[0061] WA, charging status, refers to the state of charging the car. If the car is being charged, WA is 1, otherwise it is 0;

[0062] XA is the battery pack SOC. If the A branch battery pack SOC is greater than the B branch SOC, XA is 1, otherwise it is 0;

[0063] YA is the battery pack temperature parameter. If the battery pack temperature of branch A is greater than the temperature of branch B, YA is 1, otherwise it is 0;

[0064] ZA is the historical charging parameter. If the historical charging time of branch A is greater than the historical charging time of branch B, ZA is 1, otherwise it is 0;

[0065] FacB=0.43WB+0.33XB+0.16YB+0.8ZB Parameters of A are the same as above. If FacA=FacB, branch A is prioritized.

[0066] When the conditions are met, the energy management system EMS will close the relevant relays and send a V2G current command to the AC / DC converter module. Because the left end of the AC / DC converter module is connected to three-phase power, there is no need to send a V2G voltage command to the AC / DC converter module.

[0067] The energy management system EMS can collect the amount of electricity supplied to the power grid at all times, and then transmit the electricity to Tbox via Ethernet. Tbox transmits it to the background via 4G. The background and the operator communicate via 4G, and the operator and the power grid settle the electricity. The operator and the power grid company have signed an electricity contract, so relevant electricity settlement can be carried out.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control system for feeding back electric energy from a charging pile to a power grid, characterized in that: include: Energy Management System EMS; Electronic Control Unit ECU; Charging control unit CCU; The energy management system EMS includes an AC / DC1 module, an AC / DC2 module, a DC / DC1 module and a DC / DC2 module. The electronic control unit ECU includes relays K1, K2, K3, K4, K5, K6, K7, K8, K9 and K10; The charging control unit CCU includes a battery pack 1 Pack1, a battery pack 2 Pack2, a charging gun GunA and a charging gun GunB; The AC / DC1 and AC / DC2 input sides are connected in parallel and electrically connected to the three-phase AC meter AC Meter. The AC / DC1 and AC / DC2 output sides are electrically connected to the DC / DC1 and DC / DC2 input sides through relays K2 and K4, respectively. The DC / DC1 and DC / DC2 output sides are electrically connected to the charging gun GunA and the charging gun GunB through relays K3 and K5, respectively. The DC / DC1 output side is electrically connected to the battery pack Pack1 through relays K8 and K6. The DC / DC2 output side is electrically connected to the battery pack Pack2 through relays K9 and K7.

2. A control system for feeding back electric energy from a charging pile to a power grid according to claim 1, characterized in that: The power input sides of the AC / DC1 and AC / DC2 modules are electrically connected to a three-phase AC meter via a relay K1.

3. A control system for feeding back electric energy from a charging pile to a power grid according to claim 1, characterized in that: The output sides of the AC / DC1 and AC / DC2 modules are electrically connected via a relay K10.

4. A control method for feeding back electric energy from a charging pile to a power grid, characterized in that: The following steps are involved: S1. The operator backend sends a V2G start instruction to the charging pile terminal Tbox, and the charging pile terminal Tbox uploads power information to the operator backend; S2. The charging pile terminal Tbox sends a V2G request to the energy management system EMS, and the energy management system EMS uploads power information to the charging pile terminal Tbox; S3, the energy management system EMS starts the V2G instruction and distributes power to V2G; S4. Operators and power grids settle electricity consumption.

5. A control method for feeding back electric energy from a charging pile to a power grid according to claim 4, characterized in that: The operator backend is connected to the charging pile terminal Tbox signal through the 4G network, the charging pile terminal Tbox is connected to the energy management system EMS signal through Ethernet, and the energy management system EMS communicates internally through the CAN bus.

6. A control method for feeding back electric energy from a charging pile to a power grid according to claim 4, characterized in that: The charging pile terminal Tbox in S2 requests the energy management system EMS to enter V2G at 9:00-11:00am and 14:00-16:00pm every day, and sends the requested power size Pkw to the energy management system EMS.

7. A control method for feeding back electric energy from a charging pile to a power grid according to claim 4, characterized in that: The conditions for the energy management system EMS to start V2G in S3 specifically include that the three-phase line is online, the battery SOC is greater than 50%, the system is in a high voltage state, the charging pile system fault level is low, and a TBOX request is received.

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