The utility model relates

The utility model relates to the technical field of power grid energy exchange, more specifically to a bidirectional energy exchange system between electric vehicle and power grid. Background technology: due to the uncertainty of load demand, the voltage and frequency regulation of power grid increases the operation cost of power grid to a large extent. In addition, renewable energy systems are widely connected to the power system, because of its natural discontinuity will also cause fluctuations in power generation. It is urgent to compensate the grid load with battery energy storage system, so as to smooth the natural variability of renewable energy, ensure the stability of grid frequency and restrain the voltage rise caused by reverse power flow. At the same time, with the promotion and application of a large number of new energy electric vehicles, most of the electric vehicles have a stop state for nearly several hours in a day, and their batteries belong to the stop state. The battery capacity of the electric vehicles is large, equipped with high-performance BMS system, which is a better energy storage system. The traditional energy exchange system between electric vehicle and power grid is one-way transmission, and there is no way to use the energy storage property of electric vehicle battery to realize the regulation of grid voltage and frequency. At present, the energy exchange system of electric vehicle and power grid mainly adopts power exchange technology, but this kind of energy exchange system is not suitable for application because it is difficult to popularize and use the point changing technology at present. In addition, the existing electric vehicle and power grid interaction system in the market has not effectively utilized the existing charging pile system, which leads to complex structure and costThe efficiency is relatively slow. Technical realization elements: the purpose of the utility model is to overcome the shortcomings of the existing technology, provide a bidirectional energy exchange system between electric vehicle and power grid, change the energy one-way transmission structure, and realize two-way energy exchange between electric vehicle and power grid, with high system exchange efficiency and low realization cost. In order to solve the above technical problems, the technical scheme adopted by the utility model is: to provide a bidirectional energy exchange system between electric vehicle and power grid, which is connected between electric vehicle and charging pile; the bidirectional exchange system includes intelligent control unit, AC distribution unit connected with intelligent control unit, bidirectional power conversion unit, DC distribution unit and charging The electric interface includes the AC distribution unit, the bidirectional power conversion unit, the DC power distribution unit and the charging interface in sequence; the two-way communication connection of the intelligent control unit is provided with a user terminal to realize the charging and discharging of the electric vehicle, and the user terminal is wirelessly connected with the background network. The energy bidirectional exchange system between the electric vehicle and the power grid of the utility model, the background network or the user terminal can control the charging and discharging of the electric vehicle through the intelligent control unit. During the valley period of power grid load, the electricity price is low, so the energy of the power grid can be stored in the automobile battery; during the peak load period, the energy stored in the automobile battery is fed back to the power grid to buffer the load of the power grid; when the power grid is out of power, the electric vehicle energy storage discharge is used to provide emergency power for the important loads of the power grid. The utility model is reformed based on the existing charging pile, the system structure is simple, and the plug and play system of electric vehicle is realizedHigh efficiency and low implementation cost. Furthermore, the AC distribution unit includes an AC meter and an isolation transformer, the AC meter is arranged between the AC input end and the isolation transformer, and a first contactor connected with the intelligent control unit is arranged between the AC meter and the isolation transformer. When the battery power of electric vehicle is insufficient, 380V AC is introduced into AC distribution unit and sent to bidirectional power change unit through isolation transformer to realize power quality isolation such as harmonics. Furthermore, the bidirectional power conversion unit comprises an AC module and a DC module connected in series, and the AC module and DC module are respectively connected with the intelligent control unit through the first communication board and the second communication board. The rectifying part of the bidirectional power conversion unit rectifies the alternating current into low-voltage direct current to realize AC / DC conversion. The rectified DC is boosted to the high-voltage charging voltage required by the system through the DC / DC DC DC distribution unit. Finally, the electric vehicle is charged through the charging interface. Furthermore, the DC distribution unit includes a DC meter and a fuse which are electrically connected. The fuse is connected between the DC meter and the charging interface, and a second contactor connected with the intelligent control unit is arranged between the DC module and the DC meter. When the electric vehicle battery is sufficient and needs to feed back the electric energy to the grid side, the charging interface introduces the DC power from the electric vehicle battery, and realizes DC / DC DC voltage reduction through the DC distribution unit to form low-voltage DC. The low-voltage DC realizes DC / AC conversion through the inverter part of bidirectional power change unit to form 380V AC and ACAfter passing through the isolation transformer, the current is fed into the power grid through the AC distribution unit, and the load of the power supply network enterprise is used. Furthermore, the intelligent control unit includes a control board and an acquisition board, the acquisition board is connected with the input end of the control board, the first contactor, the second contactor and the fuse are all connected with the control board, the DC meter is connected with the acquisition board, and the AC meter is connected with the control board. The DC meter collects the DC voltage in the circuit, and the AC meter collects the current and voltage during the charging and discharging process, and transmits them to the acquisition board and control board in real time. The control board can control the on-off of the circuit by controlling the first contactor and the second contactor, so as to realize the intelligent control of energy bidirectional exchange; the fuse is automatically disconnected when the line is loaded. Furthermore, the input end of the acquisition board is also connected with a surge protector. The surge protective device collects the lightning protection status signal and transmits it to the control board in real time. Furthermore, the acquisition board is connected with a fan for heat dissipation, and the output end of the acquisition board is connected with a power indicator, a normal indicator and a fault indicator, which is convenient for the staff to master the operation status of the bidirectional switching system in real time. Furthermore, the acquisition board is connected with a monitoring board, and the monitoring board is connected with a display screen for displaying monitoring data. The current and voltage signals collected by the acquisition board, the status of the first contactor, the second contactor, the surge protector and the fuse are displayed on the display screen in real time. Compared with the prior art, the utility model electronic hotel locks has the following beneficial effects: the utility model changes the unidirectional energy transmission junction based on the transformation of the existing charging pile systemTo realize the two-way energy exchange between electric vehicles and power grid: during the peak load period of the power grid, the energy stored in the automobile battery can be stored in the low price; during the peak load period, the mortise lock case energy stored in the automobile battery is fed back to the grid to buffer the load of the grid; when the power grid is cut off, the electric vehicle energy storage discharge is used to provide emergency power for the important loads of the power grid Source. The utility model is reformed based on the existing charging pile, the system structure is simple, the plug and play of electric vehicle is realized, the system efficiency is high and the realization cost is low. Fig. 1 is the structural diagram of the bidirectional energy exchange system between the electric vehicle and the power grid of the utility model. Figure 2 is the circuit diagram of the energy bidirectional exchange system between electric vehicle and power grid. The specific implementation mode the following describes the utility model in combination with fingerprint door lock manufacturers the specific implementation mode. Among them, the attached drawings are only for illustrative illustration, which are only schematic drawings, not physical drawings, and cannot be understood as restrictions on the present patent; in order to better illustrate the embodiment of the utility model, some parts of the drawings may be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, some well-known structures and their descriptions in the drawings may be omitted It's understandable. In the drawings of the embodiment of the utility model, the same or similar labels correspond to the same or similar components; in the description of the utility model, it needs to be understood that if the orientation or position relationship indicated by the terms "up", "down", "left" and "right" is based on the orientation or position relationship shown in the attached drawings, it is only for the convenience of describing the utility modelAnd simplified description, rather than indicating or implying that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative illustration and cannot be understood as a limitation of the present patent. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances. Embodiment 1 as shown in Fig. 1 to Fig. 2, the first embodiment of the bidirectional energy exchange system between the electric vehicle and the power grid of the utility model is connected between the electric vehicle and the charging pile, including the intelligent control unit 1, the AC distribution unit 2, the bidirectional power conversion unit 3, the DC distribution unit 4 and the charging interface 5 AC distribution unit 2, bidirectional power conversion unit 3, DC distribution unit 4, charging interface 5 are connected in sequence, charging interface 5 is set on charging pile, AC distribution unit 2 is connected with AC input end of distribution network; intelligent control unit 1 is connected with user terminal 6 for controlling charging and discharging of electric vehicle, and user terminal 6 is connected with background network wirelessly. In the power grid load valley period, the electricity price is low, so the power grid energy can be stored in the automobile battery; during the peak load period of the power grid, the energy stored in the automobile battery is fed back to the power grid to buffer the load of the power grid; when the power grid is cut off, the electric vehicle energy storage discharge is used to provide emergency power for the important load of the power grid. As shown in Fig. 2, the AC distribution unit 2 includes an AC meter 21 and an isolation transformer 22. The AC meter 21 is arranged at the AC input end and isolatedA first contactor 23 connected with intelligent control unit 1 is set between transformer 22, AC meter 21 and isolation transformer 22; bidirectional power conversion unit 3 includes AC module 31 and DC module 32 connected in series, AC module 31 and DC module 32 are respectively connected with intelligent control unit 1 through first communication board 33 and second communication board 34; DC distribution unit 4 includes DC meter 41 electrically connected and fused The device 42 and the fuse 42 are connected between the DC meter 41 and the charging interface 5, and a second contactor 43 connected with the intelligent control unit 1 is arranged between the DC module 32 and the DC meter 41. In this embodiment, when the battery power of electric vehicle is insufficient, 380V AC is introduced into AC distribution unit 2 and sent to bidirectional power change unit through isolation transformer 22 to realize power quality isolation such as harmonics; the rectifier part in bidirectional power conversion unit 3 rectifies alternating current into low voltage DC to realize AC / DC conversion, and DC after rectification passes through DC / DC DC DC distribution The electric unit 4 is boosted to the high voltage charging voltage required by the system, and finally the electric vehicle is charged through the charging interface 5. When the electric vehicle battery is sufficient and needs to feed back the electric energy to the grid side, the charging interface 5 introduces the direct current from the electric vehicle battery, and realizes DC / DC DC voltage reduction through the DC distribution unit 4 to form low-voltage DC. The low-voltage DC realizes DC / AC conversion through the inverter part of bidirectional power change unit to form 380V AC, and the AC passes through the AC distribution sheet after passing through the isolation transformer 22 Yuan 2 is fed into the power grid forPower grid enterprise load use. In addition, as shown in Fig. 2, the intelligent control unit 1 includes a control board 11 and an acquisition board 12, and the acquisition board 12 is connected to the input end of the control board 11; the first contactor 23, the second contactor 43 and the fuse 42 are all connected with the control board 11, the DC meter 41 is connected with the acquisition board 12, and the AC meter 21 is connected with the control board 11; the DC meter 41 collects the DC voltage in the circuit, and the AC meter 21 collects the charging and discharging The current and voltage in the electrical process are transmitted to the acquisition board 12 and the control board 11 in real time. The control board 11 can control the on-off of the circuit by controlling the first contactor 23 and the second contactor 43, so as to realize the intelligent control of energy bidirectional exchange; the fuse 42 is automatically disconnected when the line is loaded. The input end of the acquisition board 12 is also connected with a surge protector 13 to collect lightning protection status signals and transmit them to the control board 11 in real time; the acquisition board 12 is connected with a fan 14 for heat removal, and the output end of the acquisition board 12 is connected with a power indicator 15, a normal indicator light 16 and a fault indicator 17, and the acquisition board 12 is connected with a monitoring board 18, and the monitoring board 18 is connected with a monitoring data display device The status of the first contactor 23, the second contactor 43, the surge protector 13 and the fuse 42 are displayed on the display screen 19 in real time. The model of the AC meter in this embodiment is wh1-dtz719, the model of the first contactor is KM3 jcq200eda, and the model of the isolation transformer is YL sBf-50 / 0.4L, the model of the second contactor is KM1 ~ 2jcq200eda, the model of DC meter is wh2djsf719, and the model of fuse is fu1 ~ 2 rt16-00 g160a. Obviously, the above-mentioned embodiment of the utility model is only an example for clearly explaining the utility model, rather than limiting the implementation mode of the utility model. On the basis of the above description, other different forms of changes or changes may be made for ordinary technical personnel in the art. It is not necessary and impossible to enumerate all the implementation modes here. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the claims of the utility model. Technical features: 1. A bidirectional energy exchange system between electric vehicle and power grid, which is connected between electric vehicle and charging pile, is characterized in that the bidirectional exchange system includes intelligent control unit (1), AC distribution unit (2), bidirectional power conversion unit (3), DC distribution unit (4) and charging interface (5 ）And the AC configurationThe electric unit (2), bidirectional power conversion unit (3), DC distribution unit (4) and charging interface (5) are electrically connected in sequence, the charging interface (5) is arranged on the charging pile, the AC distribution unit (2) is connected with the AC input end of the distribution network; the intelligent control unit (1) is connected with a user terminal (6) for controlling the charging and discharging of electric vehicles, and the user terminal is connected with the user terminal (6) The wireless connection has a background network (7). 2. The bidirectional energy exchange system between the electric vehicle and the power grid according to claim 1, which is characterized in that the AC distribution unit (2) comprises an AC meter (21) and an isolation transformer (22), the AC meter (21) is arranged between the AC input end and the isolation transformer (22), and the intelligent control unit is arranged between the AC meter (21) and the isolation transformer (22) The element (1) is connected to a first contactor (23). 3. The bidirectional energy exchange system between the electric vehicle and the power grid according to claim 2, which is characterized in that the bidirectional power conversion unit (3) comprises an AC module (31) and a DC module (32) connected in series. The AC module (31) and the DC module (32) are respectively connected with the intelligent control unit (1) through the first communication board (33) and the second communication board (34). 4. The bidirectional energy exchange system between the electric vehicle and the power grid according to claim 3, which is characterized in that the DC distribution unit (4) comprises a DC meter (41) and a fuse (42) which are electrically connected, and the fuse (42) is connected with the DC meter (41) and the fuse (42)Between the charging interfaces, a second contactor (43) connected with the intelligent control unit (1) is arranged between the DC module (32) and the DC meter (41). 5. The bidirectional energy exchange system between electric vehicle and power grid according to claim 4, which is characterized in that the intelligent control unit (1) comprises a control board (11) and an acquisition board (12), the acquisition board (12) is connected to the input end of the control board (11); the first contact (23), the second contactor (43) and the fuse (42) are all connected with the control board (11) The DC meter (41) is connected with the acquisition board (12), and the AC meter (21) is connected with the control board (11). 6. The bidirectional energy exchange system between the electric vehicle and the power grid according to claim 5, which is characterized in that the input end of the acquisition board (12) is also connected with a surge protective device (13). 7. The bidirectional energy exchange system between electric vehicle and power grid according to claim 5, which is characterized in that the acquisition board (12) is connected with a fan (14) for heat removal, and the output end of the acquisition board (12) is connected with a power indicator (15), a normal indicator (16) and a fault indicator (17). 8. The bidirectional energy exchange system between electric vehicle and power grid according to any one of claims 5 to 7, which is characterized in that the acquisition board (12) is connected with a monitoring board (18), and the monitoring board (18) is connected with a display screen (19) for displaying monitoring data. The utility model relates to the technical field of power grid energy exchange, more specifically, to a bidirectional energy exchange system between electric vehicle and power grid, including intelligent control unit, AC distribution unit connected with intelligent control unit, bidirectional power conversion unit, DC distribution unit and charging interface, AC distribution unit, bidirectional power conversion unit and DC The power distribution unit and charging interface are connected in sequence; the intelligent control unit has two-way communication connection, and the user terminal is connected with the background network. Based on the transformation of the existing charging pile system, the utility model changes the energy unidirectional transmission structure to realize the bidirectional energy exchange between the electric vehicle and the power grid: during the load valley period of the power grid, the electricity price is low, and the energy of the power grid is stored in the automobile battery; during the peak load period of the power grid, the energy stored in the automobile battery is fed back to the power grid to buffer the load of the power grid; when the power grid is cut off, the energy stored in the automobile battery is fed back to the power grid to buffer the load, The discharge of electric vehicle energy storage is used to provide emergency power for important loads of power grid. Technical R & D personnel: Liu Hongyan; Liang Liang; Mai Peishan; Lai zhe; Li Jianhua;Tang Zhen; Kong Xiangji; Zeng Jinfeng; Gu Xiaoke; Yang Junxin protected technical users: Guangdong Power Grid Co., Ltd.; Zhuhai Power Supply Bureau of Guangdong Power Grid Co., Ltd. technology R & D date: 2018.04.28 technology announcement date: 2018.11.13 technology users: Guangdong Power Grid Co., Ltd