CN106655457A - DC light storage and charging integrated charging station - Google Patents

Abstract

The invention discloses a charging station integrating DC light storage and charging, comprising a DC bus, a solar energy input link, a wind energy input link, an energy storage circuit, a charging gun link and at least one power supply link, wherein: the DC The bus is distributed in a ring; the at least one power supply link, solar energy input link, wind energy input link, energy storage circuit and charging gun link are sequentially connected to the DC bus. The charging station integrating DC light storage and charging provided by the present invention can adopt a relatively simplified power system architecture to improve the utilization rate of new energy power, provide high-power DC fast charging capability and increase the fault tolerance of the power system.

Description

A charging station integrating DC light storage and charging

technical field

The invention relates to the technical field of DC power generation and distribution systems, in particular to a charging station integrating DC light storage and charging.

Background technique

In a charging station that provides charging services for electric vehicles, DC charging is often performed on multiple electric vehicles at the same time, and multiple chargers are required to run at the same time. With the increase of the mileage of a single charge of a vehicle, the battery capacity of a single vehicle has increased successively, and at the same time it is required to shorten the charging time, so the power capacity of a single electric vehicle charger continues to increase. At this time, in order to ensure the long-term stable and reliable operation of the equipment, and to meet the standards of harmonics and power factor, there are high requirements for the grid capacity, reliability, power factor, harmonics and efficiency of the entire charging station power supply system.

However, the current charging stations usually have the defects of low efficiency, poor fault tolerance, many links, and low utilization rate of distributed new energy sources. The existing charging stations are usually composed of multiple low-power AC/DC unit modules stacked in parallel. It is also more complicated. In addition, when the current charging station encounters rainy weather, it may be flooded by rainwater, resulting in a short circuit inside the charging station.

It should be noted that the above introduction to the technical background is only for the convenience of a clear and complete description of the technical solution of the present application, and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art just because these solutions are described in the background technology section of this application.

Contents of the invention

The purpose of the present invention is to provide a charging station integrating DC light storage and charging, which adopts a relatively simplified system architecture to improve the utilization rate of new energy power supply, provide high-power DC fast charging capability and increase the fault tolerance of the power supply system.

In order to achieve the above purpose, the present invention provides a charging station integrating DC light storage and charging, including a DC bus, a solar energy input link, a wind energy input link, an energy storage circuit, a charging gun link and at least one power supply link, wherein : the DC bus is distributed in a ring; the at least one power supply link, solar energy input link, wind energy input link, energy storage circuit and charging gun link are sequentially connected to the DC bus in a clockwise direction; the The power supply link includes an incoming line protection circuit breaker, an input interface module, and an active rectification module connected in sequence, the incoming line protection circuit breaker inputs AC power, and the active rectification module is connected to the DC bus; the input interface The models of the module and the active rectifier module are 6SL3300-7TE32-6AA0 and 6SL3330-7TE32-1AA3 respectively; the solar energy input link includes connected solar panels and DC bidirectional converters; wherein, the DC bidirectional conversion connected to the DC bus; the wind energy input link includes a connected wind energy generator and a DC bidirectional converter; wherein the DC bidirectional converter is connected to the DC bus; the energy storage link includes a connected An energy storage battery and a DC bidirectional converter; wherein, the DC bidirectional converter is connected to the DC bus; the charging gun link includes sequentially connected charging guns, rectification and filtering circuits, and DC bidirectional converters; wherein, the The DC bidirectional converter is connected to the DC bus; wherein, the charging gun includes a water leakage detection module, and the water leakage detection module includes a connected water level sensor circuit and a single-chip circuit; wherein, the single-chip circuit includes a model of STC89C52RC Single-chip microcomputer chip, the water level sensor circuit includes a model of ultrasonic distance sensor HC-SR04, the pin 1 of the ultrasonic distance sensor is connected to a 5V power supply, the pin 4 of the ultrasonic distance sensor is grounded, and the ultrasonic distance sensor The pin 2 and pin 3 of the single-chip microcomputer chip are respectively connected to the pin 1 and pin 2 correspondingly.

Further, the rectification and filtering circuit includes an axial double-split multi-pulse rectification transformer and a full-wave rectifier, wherein the full-wave rectifier includes a parallel first rectification assembly and a second rectification assembly, and the axial double A set of windings on the secondary side of the split multi-pulse rectifier transformer is connected to the first rectifier assembly, and another set of windings on the secondary side of the axial double-split multi-pulse rectifier transformer is connected to the second rectifier assembly; Wherein, a group of windings connected to the first rectification assembly is a winding in a star connection, and another group of windings connected to the second rectification assembly is a winding in a delta connection.

Further, both the first rectification component and the second rectification component include three groups of diode branches connected in parallel, wherein each group of diode branches includes two diodes connected in series.

Further, the charging gun also includes a ZigBee communication module, the ZigBee communication module includes a CC2530 ZigBee chip and a wireless transceiver circuit connected to the ZigBee chip, a crystal oscillator circuit, a networking indication circuit and a reset circuit.

Further, the wireless transceiver circuit includes a rod antenna connected to the SMA interface; the crystal oscillator circuit includes a first crystal oscillator and a second crystal oscillator with different frequencies, and the two ends of the first crystal oscillator are respectively connected to the ZigBee The pin 22 of the chip is connected to the pin 23, and the two ends of the second crystal oscillator are respectively connected to the pin 32 and the pin 33 of the ZigBee chip; the networking indication circuit includes a first LED light and an eighth resistor , the positive pole of the first LED lamp is connected to the pin 6 of the ZigBee chip, and the negative pole is grounded through the eighth resistor; the reset circuit includes a 3.3V DC power supply, a drop resistor, and a key switch connected in sequence, One end of the key switch close to the dropping resistor is connected to the pin 20 of the ZigBee chip, and the other end of the key switch is grounded.

Further, the water leakage detection module also includes a communication circuit, the communication circuit includes a communication chip of the model MAX485, the pins 2 and 3 of the communication chip are short-circuited, and the pins 1, 3 of the communication chip are short-circuited. Pin 2 and pin 4 are respectively connected to pin 10, pin 3 and pin 11 of the single-chip microcomputer chip through the first optocoupler isolator, the second optocoupler isolator, and the third optocoupler isolator, so Between the pin 8 and the pin 6 of the communication chip, between the pin 6 and the pin 7, and between the pin 7 and the pin 8, a resistor is connected, and the pin 8 of the communication chip is connected to the power supply of 5V connected and pin 5 to ground.

The beneficial effects of the present invention are:

The DC bus with ring distribution is used, and when any link fails, it will not affect the normal operation of other devices, thereby improving the fault tolerance of the system. In addition, the charging station includes solar panels and wind power motors, which can improve the utilization rate of new energy. Furthermore, through the DC bidirectional converter, on the one hand, the AC power supply can supply power to the energy storage battery and the charging gun; The system architecture realizes multiple power supply modes, thereby improving the power supply stability of the power supply system. In addition, by setting a water leakage detection module, the current water level around the charging station can be detected. After the water level information is detected, the water level information can be transmitted to the terminal equipment of the charging station management personnel in a wireless or wired manner, so as to prevent the charging station from being submerged in water, thereby eliminating potential safety hazards caused by water entering the charging station.

With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the present application may be employed. It should be understood that the specific embodiments of the application are not limited in scope thereby. The specific embodiments of the present application encompass many changes, modifications and equivalents within the spirit and terms of the appended claims.

Features described and/or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for other embodiments features in the method.

It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of a feature, integer, step or component, but does not exclude the presence or addition of one or more other features, integers, steps or components.

Description of drawings

Fig. 1 is a schematic frame diagram of a charging station integrating DC light storage and charging provided by the present invention;

Fig. 2 is the circuit diagram of rectifying filter circuit among the present invention;

Fig. 3 is the schematic circuit diagram of ZigBee communication module among the present invention;

Fig. 4 is a schematic circuit diagram of the water level detection module in the invention.

detailed description

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the specific embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the specific embodiments of the application. Obviously, the The described specific implementations are only part of the specific implementations of the application, but not all of the specific implementations. Based on the specific implementation modes in this application, all other specific implementation modes obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application.

Please refer to Figure 1. The embodiment of this application provides a charging station with integrated DC light storage and charging, including at least one power supply link, DC bus, solar energy input link, wind energy input link, energy storage circuit and charging gun link ,in:

The DC bus DC-BUS is distributed in a ring.

The at least one power supply link, solar energy input link, wind energy input link, energy storage circuit and charging gun link are sequentially connected to the DC bus DC-BUS in a clockwise direction.

The power supply link includes an incoming line protective circuit breaker Q1 or Q2, an input interface module AIM1 or AIM2, and an active rectification module ALM1 or ALM2 connected in sequence, the incoming line protective circuit breaker inputs AC power, and the active rectifying module connected to the DC bus; the models of the input interface module and the active rectification module are 6SL3300-7TE32-6AA0 and 6SL3330-7TE32-1AA3 respectively.

The solar energy input link includes a connected solar panel S and a DC bidirectional converter DCP1; wherein the DC bidirectional converter DCP1 is connected to the DC bus DC-BUS.

The wind energy input link includes a connected wind energy generator G and a DC bidirectional converter DCP2; wherein the DC bidirectional converter DCP2 is connected to the DC bus DC-BUS.

The energy storage link includes a connected energy storage battery B and a DC bidirectional converter DCP3; wherein the DC bidirectional converter DCP3 is connected to the DC bus DC-BUS.

The charging gun link includes a charging gun K, a rectifying and filtering circuit, and a DC bidirectional converter DCP4 connected in sequence; wherein, the DC bidirectional converter DCP4 is connected to the DC bus DC-BUS.

In the present application, the charging gun includes a water level detection module. Please refer to Fig. 4, described water level detection module comprises the connected water level sensor circuit and single-chip microcomputer circuit; Wherein, described single-chip microcomputer circuit comprises the single-chip microcomputer chip U6 that model is STC89C52RC, and described water level sensor circuit comprises the ultrasonic distance sensor that model is HC-SR04 U5, the pin 1 of the ultrasonic distance sensor U5 is connected to the power supply of 5V, the pin 4 of the ultrasonic distance sensor U5 is grounded, and the pin 2 and pin 3 of the ultrasonic distance sensor U5 are respectively connected to the single chip microcomputer chip Pin 1 and pin 2 are connected accordingly. Among the pins of the ultrasonic distance sensor U5, pin 1 is a power pin, pin 4 is a ground, pin 2 is a trigger signal input pin, and pin 3 is an echo signal output end.

In the present invention, the water level detection module further includes a communication circuit. Please refer to Fig. 4, described communication circuit comprises the communication chip U1 that model is MAX485, and pin 2 and pin 3 of described communication chip U1 are short-circuited, and pin 1, pin 2, pin 3 of described communication chip U1 Pin 4 is correspondingly connected with pin 10, pin 3, and pin 11 of the single-chip microcomputer chip U6 through the first optocoupler isolator U2, the second optocoupler isolator U3, and the third optocoupler isolator U4. Resistors are connected between pin 8 and pin 6, between pin 6 and pin 7, and between pin 7 and pin 8 of the communication chip U1, and these three resistors are R7, R9, and R8 in sequence. Pin 8 of the communication chip U1 is connected to a 5V power supply, and pin 5 is grounded. Pin 2 and pin 4 of the communication chip are connected to a 5V power supply through pull-up resistors R5 and R6 respectively, and pin 1 of the communication chip is connected to the first optocoupler isolator U2 through a current limiting resistor R1 .

In this embodiment, the active rectifier module can be used as an AC input terminal, and various AC power sources can be used for input, and the voltage, frequency, and power can be in a wide range, satisfying voltage 380V, 600V±30%; frequency 50- 60Hz±30%; power: 200-400A.

The DC bidirectional converter can meet the input 0-800V DC voltage; output 0-800V DC voltage, rated power: 120kW. The DC bidirectional converter can use digital DSP control technology; support CAN-bus, RTU485, Profibus, TCP/IP communication.

The energy storage battery can use lithium/lead-acid/lead-carbon batteries, and the DC bidirectional converter can control the charge and discharge of the battery, so that the optimal charge and discharge curve can be controlled for different batteries. Maximally prolong battery life and ensure the effect of use.

The charging gun can use a DC bidirectional converter for charging control, read the BMS (Battery Management System, BATTERY MANAGEMENT SYSTEM) information of the electric vehicle through CAN-bus communication, and perform fast charging according to the BMS characteristics of the vehicle.

In the actual application process, AC power can be input through the power supply link. After the AC power passes through the input interface module and the active rectification module, it can be converted into DC power. After the DC power passes through the ring DC bus, it can pass through the DC bidirectional converter Supply power to the energy storage battery and charging gun. In addition, solar panels and wind energy motors can also supply power to energy storage batteries and charging guns through DC bidirectional converters and ring DC buses. In addition, after the energy storage battery has sufficient power, it can supply power to the charging gun through the DC bidirectional converter and the ring DC bus. It can be seen from the above that the charging station integrated with DC, solar, storage and charging can be equipped with multiple charging modes, so as to ensure the stability of the system.

In this embodiment, in order to ensure that the DC power provided by the charging gun can be more stable, a rectification and filtering circuit may be provided between the charging gun and the DC bidirectional converter. Please refer to FIG. 2 , the rectification filter circuit includes an axial double-split multi-pulse rectifier transformer 21 and a full-wave rectifier 22, wherein the full-wave rectifier 22 includes a parallel first rectifier assembly 221 and a second rectifier assembly 222, a set of windings 211 on the secondary side of the axial double-split multi-pulse rectifier transformer 21 is connected to the first rectifier assembly 221, and the other winding 211 on the secondary side of the axial double-split multi-pulse rectifier transformer 21 The first winding 212 is connected to the second rectification assembly 222 .

In the present invention, both the first rectifying component 221 and the second rectifying component 222 include three groups of diode branches connected in parallel, wherein each group of diode branches includes two diodes connected in series.

In the present invention, a group of windings connected to the first rectification assembly 221 may be a winding in a star connection, and another group of windings connected to the second rectification assembly 222 may be a winding in a delta connection .

The rectifying and filtering circuit in the present invention can step down the direct current through an axial double-split multi-pulse rectifying transformer, and then rectify it through two sets of rectifying components to output direct current for use by the charging gun. By increasing the output voltage of the rectifier and filter circuit, under the condition of a certain transmission power, the higher DC output voltage can greatly reduce the current on the transmission cable, thereby reducing the cross-sectional area of the transmission cable, resulting in The direct benefit is to reduce the amount of metal materials such as copper and aluminum on the transmission line. In addition, there is no AC inductance loss in DC transmission, which can reduce the power loss on the transmission line.

In the present invention, the charging gun can also include a ZigBee communication module, so that the charging gun can be controlled through wireless communication. Please refer to Fig. 3, described ZigBee communication module includes the ZigBee chip that model is CC2530 and the wireless transceiver circuit that links to each other with described ZigBee chip, crystal oscillator circuit, networking indication circuit and reset circuit, wherein, include in the described wireless transceiver circuit and The rod antenna A1 connected to the SMA interface, of course, PCB antenna, inverted F antenna, helical antenna, etc. can also be used according to different needs. The crystal oscillator circuit comprises a first crystal oscillator X1 and a second crystal oscillator X2 with different frequencies, and the two ends of the first crystal oscillator X1 are respectively connected to pins 22 and 23 of the ZigBee chip, and the second crystal oscillator X2 The two ends of the ZigBee chip are respectively connected to pin 32 and pin 33. The frequency of the first crystal oscillator X1 is 32MHz, which is needed when the ZigBee chip performs wireless transmission and reception; and the frequency of the second crystal oscillator X2 is 32.768KHz, which can provide the system clock for the ZigBee chip.

The networking indication circuit includes a first LED lamp LED1 and an eighth resistor R8, the positive pole of the first LED lamp LED1 is connected to the pin 6 of the ZigBee chip, and the negative pole is grounded through the eighth resistor R8. The networking indication circuit is used to display whether the ZigBee communication module joins the ZigBee network, thereby judging whether the ZigBee communication module is connected with other ZigBee communication modules. When the ZigBee communication module joins the ZigBee network, the pin 6 of the ZigBee chip outputs a high level, making the first LED light LED1 glow, indicating that the ZigBee communication module has joined the ZigBee network.

The reset circuit includes a DC power supply of 3.3V connected in sequence, a drop resistor R9, a key switch K2, and one end of the key switch K2 near the drop resistor R9 is connected to the pin 20 of the ZigBee chip, the The other end of the key switch K2 is grounded. When the key switch K2 is pressed, a low level is input from the pin 20 of the ZigBee chip to reset the ZigBee communication module.

The beneficial effects of the present invention are:

The DC bus with ring distribution is used, and when any link fails, it will not affect the normal operation of other devices, thereby improving the fault tolerance of the system. In addition, the charging station includes solar panels and wind power motors, which can improve the utilization rate of new energy. Furthermore, through the DC bidirectional converter, on the one hand, the AC power supply can supply power to the energy storage battery and the charging gun; The system architecture realizes multiple charging and power supply methods, which can improve the stability of the power supply system. In addition, by setting a water leakage detection module, the current water level around the charging station can be detected. After the water level information is detected, the water level information can be transmitted to the terminal equipment of the charging station management personnel in a wireless or wired manner, so as to prevent the charging station from being submerged in water, thereby eliminating potential safety hazards caused by water entering the charging station.

Although the present invention has been described in detail with general descriptions and specific examples above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (6)

1. A charging station integrating DC light storage and charging, characterized in that the charging station includes a DC bus, a solar energy input link, a wind energy input link, an energy storage circuit, a charging gun link and at least one power supply link ,in: The DC bus is distributed in a ring; The at least one power supply link, solar energy input link, wind energy input link, energy storage circuit and charging gun link are sequentially connected to the DC bus; The power supply link includes an incoming line protection circuit breaker, an input interface module, and an active rectification module connected in sequence, the incoming line protection circuit breaker inputs AC power, and the active rectification module is connected to the DC bus; The models of the input interface module and the active rectification module are 6SL3300-7TE32-6AA0 and 6SL3330-7TE32-1AA3 respectively; The solar energy input link includes a connected solar panel and a DC bidirectional converter; wherein the DC bidirectional converter is connected to the DC bus; The wind energy input link includes a connected wind energy generator and a DC bidirectional converter; wherein the DC bidirectional converter is connected to the DC bus; The energy storage link includes a connected energy storage battery and a DC bidirectional converter; wherein the DC bidirectional converter is connected to the DC bus; The charging gun link includes a charging gun, a rectifying and filtering circuit, and a DC bidirectional converter connected in sequence; wherein, the DC bidirectional converter is connected to the DC bus; Wherein, the charging gun includes a water leakage detection module, the water leakage detection module includes a connected water level sensor circuit and a single-chip circuit; - the ultrasonic distance sensor of SR04, the pin 1 of the ultrasonic distance sensor is connected to the power supply of 5V, the pin 4 of the ultrasonic distance sensor is grounded, and the pin 2 and pin 3 of the ultrasonic distance sensor are respectively connected to the Pin 1 and pin 2 of the microcontroller chip are connected correspondingly. 2. The DC light-storage-charge integrated charging station according to claim 1, wherein the rectification filter circuit includes an axial double-split multi-pulse rectifier transformer and a full-wave rectifier, wherein the full-wave The rectifier includes a parallel first rectification assembly and a second rectification assembly, a set of windings on the secondary side of the axial double-split multi-pulse rectifier transformer is connected to the first rectification assembly, and the axial double-split multi-pulse rectification transformer Another set of windings on the secondary side of the wave rectifier transformer is connected to the second rectification assembly; wherein, the set of windings connected to the first rectification assembly is a winding in star connection, and the second rectification assembly Another group of windings connected is a winding in a delta connection. 3. The DC light-storage-charge integrated charging station according to claim 2, characterized in that, the first rectification component and the second rectification component both include three groups of diode branches connected in parallel, wherein each group The diode branch includes two diodes connected in series. 4. The DC light-storage-charge integrated charging station according to claim 3, characterized in that, the charging gun also includes a ZigBee communication module, and the ZigBee communication module includes a ZigBee chip of model CC2530 and is connected to the The wireless transceiver circuit, the crystal oscillator circuit, the networking indication circuit and the reset circuit connected to the ZigBee chip. 5. The DC light-storage-charge integrated charging station according to claim 4, characterized in that, the wireless transceiver circuit includes a rod-shaped antenna connected to the SMA interface; the crystal oscillator circuit includes a second One crystal oscillator and the second crystal oscillator, the two ends of the first crystal oscillator are connected with the pin 22 and the pin 23 of the ZigBee chip respectively, and the two ends of the second crystal oscillator are respectively connected with the pin 32 and the pin 23 of the ZigBee chip The pin 33 is connected; the networking indication circuit includes the first LED lamp and the eighth resistor, the positive pole of the first LED lamp is connected with the pin 6 of the ZigBee chip, and the negative pole is grounded through the eighth resistor; Described reset circuit comprises the direct current power supply of 3.3V connected successively, dropping resistance, key switch, and one end of described key switch is connected with the pin 20 of described ZigBee chip near described dropping resistance, the other end of described key switch grounded. 6. The DC light-storage-charge integrated charging station according to claim 1, characterized in that, the water leakage detection module further includes a communication circuit, and the communication circuit includes a communication chip modeled as MAX485, and the communication chip Pin 2 and pin 3 are short-circuited, and pin 1, pin 2, and pin 4 of the communication chip are connected through the first optocoupler isolator, the second optocoupler isolator, the third optocoupler isolator and the The pin 10, pin 3, and pin 11 of the single-chip microcomputer chip are connected correspondingly, between the pin 8 and the pin 6 of the communication chip, between the pin 6 and the pin 7, and between the pin 7 and the pin Resistors are connected between 8, the pin 8 of the communication chip is connected to a 5V power supply, and the pin 5 is grounded.