CN115402139A

CN115402139A - Wind-solar reserve type IGBT reversible direct current rapid charging pile

Info

Publication number: CN115402139A
Application number: CN202211344385.4A
Authority: CN
Inventors: 刘震; 黄大强
Original assignee: Shenzhen Autoway Power Technology Co ltd
Current assignee: Shenzhen Autoway Power Technology Co ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2022-11-29
Anticipated expiration: 2042-10-31
Also published as: CN115402139B

Abstract

The invention relates to a wind-solar reserve type IGBT reversible direct current rapid charging pile, which comprises: the device comprises a wind power input device, a photovoltaic power input device, a reserve battery input device, a power grid power input device, a direct current sensor, a three-phase four-wire vector inverter, a combined switch device and a control device, wherein the wind power input device, the photovoltaic power input device and the reserve battery input device are respectively and electrically connected with the input end of the direct current sensor, the output end of the direct current sensor is electrically connected with the three-phase four-wire vector inverter, the output ends of the three-phase four-wire vector inverter and the power grid power input device are electrically connected with the combined switch device, and the combined switch device is used for outputting a direct current high-voltage charging power supply. The application can be from carrying out many-sided energy integration, satisfying 800A or even higher current output, can realize can both carrying out quick charge in remote area, alleviate the technical problem of the energy burden of national grid.

Description

Wind-solar reserve type IGBT reversible direct current rapid charging pile

Technical Field

The invention relates to the field of new energy, in particular to a wind and light reserve type IGBT reversible direct current rapid charging pile.

Background

With the shortage of global energy and the rise of new energy automobiles, the charging of electric automobiles does not keep pace with the times. Fundamentally, electric vehicles face a number of difficulties. How to accelerate the speed of charging just so require the battery to bear the charging current that is several times more than self discharge current, though can accomplish the current charging of 6 times with the battery at present, nevertheless just need to provide the electric pile that fills of this kind of heavy current. When a new energy automobile needs 400V125A current for charging for one hour from 0-100% according to the average standard battery voltage of the new energy automobile of about 300-400V and the capacity of 50KW/H, although the battery cannot start from 0 but needs less than 1 hour, the time required for charging a new energy automobile according to the current (400V 750A) which is 6 times that of the battery is shortened to 10 minutes.

However, the existing charging pile can only be supplied with power by a national power grid, so that the use environment of the quick charging pile is limited, the limitation of the quick charging pile is large, and in addition, the existing charging pile can only depend on the national power grid, so that the energy burden of the national power grid is increased, and strong dependency is formed.

Disclosure of Invention

The application provides a wind-solar reserve formula IGBT reversible type direct current fills electric pile fast for solve how from carrying on many-sided energy integration, satisfy 800A or even higher current output and how to realize can both carrying out quick charge, lightening the technical problem of the energy burden of national electric wire netting in remote area.

The application provides a stake of wind-solar reserve formula IGBT reversible type direct current quick charging includes:

a wind-solar reserve type IGBT reversible direct current rapid charging pile comprises: a wind power input device, a photovoltaic power input device, a reserve battery input device, a power grid input device, a direct current sensor, a three-phase four-wire vector inverter, a combined switch device and a control device,

the output ends of the wind power input device, the photovoltaic power input device and the reserve battery input device are respectively and electrically connected with the input end of the direct current sensor, the output end of the direct current sensor is electrically connected with the three-phase four-wire vector inverter, the output ends of the three-phase four-wire vector inverter and the power grid input device are electrically connected with the combined switch device, the combined switch device is used for outputting a direct current high-voltage charging power supply, and the control device is respectively and electrically connected with the wind power input device, the photovoltaic power input device, the reserve battery input device, the power grid input device, the direct current sensor, the three-phase four-wire vector inverter and the combined switch device;

the three-phase four-wire vector inverter comprises an IGBT three-phase four-wire inverter bridge, a three-phase four-wire low-pass filter, a three-phase current sensor and a three-phase voltage sensor which are sequentially connected, wherein the input end of the IGBT three-phase four-wire inverter bridge is electrically connected with the output end of the direct current sensor, and the output end of the three-phase voltage sensor is electrically connected with the combined switch device.

Optionally, the wind power input device includes a rectifying unit, a PFC-DC boost unit, and a first DCDC isolated primary DC unit, where an input end of the rectifying unit is connected to the wind power, and an output end of the rectifying unit sequentially passes through the PFC-DC boost unit and the first DCDC isolated primary DC unit to output an isolated DC power.

Optionally, the PFC-DC boost unit also directly supplies power to a DC bus of the charging pile.

Optionally, the photovoltaic power input device includes a photovoltaic MPPT control unit, a PFC-BOOST unit, and a second DCDC isolated primary direct current unit, an input end of the photovoltaic MPPT control unit is connected to a photovoltaic power supply, and an output end of the photovoltaic MPPT control unit sequentially passes through the PFC-BOOST unit and the second DCDC isolated primary direct current unit to output an isolated direct current power supply.

Optionally, the PFC-BOOST unit further directly supplies power to a dc bus of the charging pile.

Optionally, the reserve battery input device includes a rectification module, a PFC-DC boost module, and a first DCDC isolated primary DC module, where an input end of the rectification module is connected to a power grid power supply, and an output end of the rectification module sequentially passes through the PFC-DC boost module and the first DCDC isolated primary DC module to output an isolated DC power supply.

Optionally, the PFC-DC boost module is further electrically connected with the control device.

Optionally, the power grid power input device includes a battery management module, a PFC-BOOST module, and a second DCDC isolated primary direct current module, an input end of the battery management module is connected to a reserve battery, and an output end of the battery management module sequentially passes through the PFC-BOOST module and the second DCDC isolated primary direct current module to output an isolated direct current power.

Optionally, the PFC-BOOST module is further electrically connected to the control device, and the PFC-BOOST module is further configured to directly supply power to a dc bus of the charging pile.

Optionally, the control device includes a central control unit, an MCU processing unit, a wireless transmission unit and a display unit, the central control unit is electrically connected to the wind power input device, the photovoltaic power input device, the reserve battery input device, the grid power input device, the dc current sensor, the three-phase four-wire vector inverter and the combination switch device, the central control unit is also electrically connected to the MCU processing unit, and the MCU processing unit is electrically connected to the wireless transmission unit and the display unit.

According to the technical scheme, the method has the following advantages:

1. the utility model provides a stake of wind-light deposit formula IGBT reversible type direct current fast charging, through setting up wind-force, photovoltaic, the power input of electric wire netting and deposit battery is selected, it can realize the conversion between the multipotency source, the input of commercial power has been cut off and the reliance to the commercial power has been reduced by the comprehensive power supply of light energy wind energy under the sufficient condition of light energy wind energy, provide the energy by deposit formula battery under the insufficient condition of wind energy light energy, just provide the energy by the commercial power under the all insufficient condition of wind energy light energy storage, and coordinate work each other, reach the energy utilization maximize. The invention can integrate energy in multiple aspects, meet 800A or even higher current output, realize rapid charging in remote areas and reduce energy burden of national power grid.

2. Under the condition of sufficient wind and solar energy, the three-phase four-wire alternating current inverter can invert the three-phase four-wire alternating current to be used by users or energy stations for working, and can charge the reserve battery. When a new energy automobile is charged, the wind and light energy can directly charge the automobile; when night reserve battery work provides the battery energy into three-phase alternating current for the energy station work to provide the direct current and work for filling electric pile. Therefore, the problem of decommissioning treatment of the waste batteries of the new energy automobile is solved, namely the waste batteries of the new energy automobile are secondarily utilized to manufacture the reserve batteries, and the energy burden of the charging pile on the national power grid is reduced.

3. Compared with the traditional MOS tube parallel type current increasing mode, the IGBT three-phase four-wire inverter bridge has the advantages that the IGBT three-phase four-wire inverter bridge is arranged on the three-phase four-wire vector inverter, so that the conduction response is faster and the synchronism is better; compared with the traditional MOS tube series connection type voltage increasing mode, the IGBT three-phase four-wire inverter bridge can effectively reduce the influence of a single tube, so that the fault rate is lower, the driving mode is simpler, high voltage and large current can be realized by the IGBT, and the size is smaller than that of the MOS tube connection mode.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic block diagram of a wind-solar reserve type IGBT reversible dc fast charging pile according to an embodiment of the present invention;

FIG. 2 is a functional block diagram of the wind power input device shown in FIG. 1;

FIG. 3 is a functional block diagram of the photovoltaic power input apparatus shown in FIG. 1;

FIG. 4 is a functional block diagram of the reserve battery input apparatus shown in FIG. 1;

FIG. 5 is a functional block diagram of the mains power input device shown in FIG. 1;

FIG. 6 is a functional block diagram of the control device shown in FIG. 1;

FIG. 7 is a circuit diagram of the photovoltaic power input device and the grid power input device shown in FIG. 1;

FIG. 8 is a circuit diagram of the wind power input device and the reserve battery input device shown in FIG. 1;

fig. 9 is a diagram of the PFC driving waveform (one) shown in fig. 1;

fig. 10 is a diagram of the PFC driving waveform shown in fig. 1 (ii);

fig. 11 is a circuit diagram of the three-phase four-wire vector inverter shown in fig. 1;

FIG. 12 is a diagram of phase shifting drive waveforms shown in FIG. 1;

FIG. 13 is a circuit diagram of the three-phase H-bridge inverter group shown in FIG. 1;

FIG. 14 is a circuit diagram of the sine wave (a) and phase difference (b) shown in FIG. 1;

FIG. 15 is a circuit diagram of the DSP-MCU driving group shown in FIG. 1;

FIG. 16 is the three-phase drive waveform shown in FIG. 1;

FIG. 17 is a circuit diagram of the DSP-MCU driving power pack shown in FIG. 1;

FIG. 18 is a circuit diagram of the DC/DC power module shown in FIG. 1;

FIG. 19 is a functional block diagram of the combination switch device shown in FIG. 1;

fig. 20 is a functional block diagram of the power distribution unit shown in fig. 1.

Detailed Description

The embodiment of the application discloses a wind-solar reserve type IGBT reversible direct current rapid charging pile is provided.

The multifunctional direct-current rapid charging pile (station) is combined with four systems of ' available secondary recycling of old batteries of new energy vehicles, photovoltaic power generation, wind power generation and national power grids ' and capable of inverting output, is called as wind-solar reserve type IGBT reversible direct-current rapid charging pile for short ', can achieve energy inversion three-phase four-wire alternating-current output in places where high-power transmission of national power grids cannot reach, can directly change 200-1000V (0-800A) direct-current voltage output at the same time, and achieves the purpose of rapidly charging new energy vehicles by means of photovoltaic wind energy and reserve batteries in remote areas.

Under the current environment, new energy automobile obtains vigorous development, and electric automobile's demand increases rapidly, and along with electric automobile's battery capacity is bigger and bigger, duration is longer and longer, the state charges to new energy automobile and has a new policy, requires the time of charging short, and charge capacity is big, and then super quick charge must keep up with the step of the epoch. Under the policy of large infrastructure, charging facilities are well-established, and the problem of difficult charging of new energy automobiles is being solved; meanwhile, the battery technology of the new energy automobile continuously improves the current charging of 6 times of the capacity of the existing 6C battery in the market. The wind-solar reserve type IGBT reversible direct current rapid charging pile has great advantages.

The main energy of the mainstream charging pile in the current market still depends on the national power grid for power supply, but the limitation is brought because the high-power grid of the expressway in China cannot reach in a plurality of remote mountain areas, so that the high-power direct-current quick charging cannot be realized, and in addition, the problem that the production manufacturers are very headache is solved by the retired recovery and treatment of the retired batteries of the new energy automobile, the sunshine is sufficient in the northwest of China, the wind energy is sufficient in the south of China, and the secondary voltage of the wind power generation system at the MW level is 690V, so that the mainstream charging pile is suitable for being used by the IGBT direct-current quick charging pile. The wind-solar energy storage type IGBT reversible direct-current rapid charging pile utilizes the advantages to form a set of system, when wind and solar energy is sufficient, three-phase four-wire alternating current is inverted to be used for users or energy stations to work and charge the storage type battery, when a new energy automobile is charged, wind and solar energy can directly charge the automobile, when the new energy automobile is charged, the storage type battery works, the battery energy is provided to be three-phase alternating current to work for the energy stations, and direct current is provided to work for the charging pile. Therefore, the problem of retirement treatment of the old battery of the new energy automobile is solved, the old battery is secondarily utilized and manufactured into the reserve battery, and the energy burden of a charging pile on a national power grid is relieved.

The direct current rapid charging pile adopting the IGBT multi-power supply synthesis type utilizes the advantage of high-voltage and large-current transmission of the IGBT to realize isolated safety type direct current power supply output (for new energy automobiles) and isolated safety type alternating current three-phase four-wire output (for charging stations to work and use).

When a solar panel is connected, the MPPT management system of the solar panel detects the maximum power point in real time, and outputs a first-stage isolation boosting VDC after a dynamic direct-current power supply is transmitted to the PFC-BOOST/DC-DC system to be stabilized.

When the wind driven generator is connected, the 690V power supply is input into the three discrete PFC-DC/DC-DC to obtain a second-stage isolation boosting VDC under the regulation and control of the central control system.

When the mains supply is connected, a 380V power supply is input into the three-stage discrete PFC-DC/DC-DC under the regulation and control of the central control system to obtain a third-stage isolation boosting VDC.

When the reserve battery is connected, the battery power behind the central control system is output by the PFC-BOOST/DC-DC through the BMS to obtain a fourth-stage isolation boosting VDC.

And (3) feeding the four-level VDC of the first-level and second-level (three-level is not involved in inversion) into a DC/AC IGBT three-phase four-line vector sine inverter bridge after passing through a first confluence device to obtain a three-phase four-line sine wave, and outputting the positive wave (used in a station in a pile) after being regulated and controlled by a DSP.

The first-stage second-stage three-level four-level VDC is sent into a DC/DC IGBT direct current power allocation module after passing through a second confluence device to be converted and output 200-1000V (0-800A) direct current to a super charging pile

When the BMS obtains the capacity of the reserve battery and the voltage information is insufficient, the BMS sends data to the central control system, the central control system disconnects the output of the reserve battery, and the energy of the photovoltaic wind power is transferred to the reserve battery for charging.

Therefore, the wind and light reserve type IGBT reversible direct current quick charging pile realizes the conversion among multiple energy sources, cuts off the input of commercial power under the condition of sufficient light energy and wind energy, is comprehensively supplied with power by the light energy and the wind energy, reduces the dependence on the commercial power, is supplied with energy by the reserve type battery under the condition of insufficient wind energy and light energy, is supplied with energy by the commercial power under the condition of insufficient wind energy and light energy storage, and is coordinated with each other to work so as to achieve the maximum energy utilization.

In order to provide large current for charging, the charging can be realized only by an IGBT charging pile. And the wind-solar reserve type IGBT reversible direct current rapid charging pile is used for transferring energy from four aspects. Energy integration can easily reach 800A or even higher current. This is that ordinary charging pile can't do. And the new energy automobile also faces the problem of battery decommissioning. How old new energy batteries are treated, the abandonment pollutes the environment, the recovery brings huge recovery cost, and the best mode is to make the old new energy batteries into energy packages by secondary utilization. A plurality of new energy waste batteries are integrated to form a huge energy packet, and then the electric automobile is charged by the energy of the energy packet to achieve the purpose of secondary recycling. Therefore, the wind and light reserve type IGBT reversible direct-current rapid charging pile can be installed and applied wherever, and the burden on power grid energy is reduced.

It should be further noted that the ultra-fast charging pile is manufactured by comprehensively adopting the integrated IGBT. The high-speed switching capacity of the MOSFET is realized, and the MOSFET cannot achieve the high-speed switching capacity in the aspects of large current and high voltage. So can accomplish the energy density that MOSFET can not reach as the core module with IGBT, the efficiency is improved, the loss is reduced, and the IGBT modular operation aspect is that MOS can not reach, MOS is the mode that the monomer structure can not accomplish polycell integration in a module, the consequence that brings like this is that MOS's volume mode is great than IGBT, MOS improves the mode of electric current and adopts parallel, still bring many problems in the aspect of the drive like this, it can not unify to continue when the switch tube is opened, can produce the hysteresis that some in advance of single tube generate heat. The MOS transistor is limited by voltage stress in high voltage, and the voltage is required to be increased only by connecting multiple transistors in series. The problem that brings like this is that a pipe goes out the problem and influences the whole situation, by the switch of IGBT integrated type preparation, can adopt a module polycell, the fault rate is very big decline like this, and the drive mode becomes simple, therefore, IGBT can not only accomplish high voltage heavy current, and the volume still is littleer than adopting the MOS mode moreover.

Meanwhile, a new energy source is added on the traditional charging pile to supplement and utilize energy sources twice, the traditional charging pile can only depend on a national power grid to charge a new energy automobile, and the wind-light reserve type IGBT reversible direct current quick charging pile changes the single mode that wind-light reserve energy is used as main energy sources, energy sources of the power grid are used as standby energy sources, meanwhile, bidirectional direct current energy output is achieved to charge the new energy automobile, and alternating current energy is used for supplying power to the interior of the station.

In an embodiment, referring to fig. 1, a wind-solar energy storage type IGBT reversible dc fast charging pile includes: a wind power input device, a photovoltaic power input device, a reserve battery input device, a power grid input device, a direct current sensor, a three-phase four-wire vector inverter, a combined switch device and a control device,

Therefore, the conversion among multiple energy sources can be realized by setting power input selection of wind power, photovoltaic power, a power grid and a reserve battery, the input of a mains supply is cut off under the condition that light energy and wind energy are sufficient, the dependence on the mains supply is reduced by comprehensively supplying power by the light energy and the wind energy, the reserve battery provides energy under the condition that the light energy and the wind energy are insufficient, the mains supply provides energy under the condition that the energy storage of the wind energy and the light energy is insufficient, and the energy sources are coordinated with each other to achieve the maximum energy utilization. The invention can integrate energy in multiple aspects, meet 800A or even higher current output, realize rapid charging in remote areas and reduce energy burden of national power grid.

Under the condition of sufficient wind and solar energy, the three-phase four-wire alternating current is inverted to be used by users or energy stations, and the reserve battery is charged. When a new energy automobile is charged, the wind and light energy can directly charge the automobile; reserve formula battery work provides the three-phase alternating current for the energy station work with the battery energy when night to provide the direct current and work for charging pile. Therefore, the problem of decommissioning treatment of the waste batteries of the new energy automobile is solved, namely the waste batteries of the new energy automobile are secondarily utilized to manufacture the waste batteries into reserve batteries, and the problem of reducing energy burden of a national power grid by charging pile pairs is solved.

Referring to fig. 2, the wind power input device includes a rectifying unit, a PFC-DC boost unit, and a first DCDC isolated primary DC unit, wherein an input end of the rectifying unit is connected to the wind power, and an output end of the rectifying unit sequentially passes through the PFC-DC boost unit and the first DCDC isolated primary DC unit to output an isolated DC power. In this embodiment, the PFC-DC boost unit further directly supplies power to a DC bus of the charging pile.

It should be noted that, when the energy of wind power generation is connected, the energy first enters into the rectifier to rectify the alternating current power into the direct current power, and the direct current power is sent to the PFC-DC controller to be boosted, and at the same time, the power factor of the power grid is improved, and at this time, the energy of wind power generation is rectified to obtain direct current voltage of about 850V to supply power to the direct current bus of the charging pile, and at the same time, the direct current bus voltage of 850V is sent to the inverter of the first DC/DC primary isolation direct current source to provide the isolation direct current source.

Referring to fig. 3, the photovoltaic power input device includes a photovoltaic MPPT control unit, a PFC-BOOST unit, and a second DCDC isolated primary dc unit, an input end of the photovoltaic MPPT control unit is connected to a photovoltaic power, and an output end of the photovoltaic MPPT control unit sequentially passes through the PFC-BOOST unit and the second DCDC isolated primary dc unit to output an isolated dc power. In this embodiment, the PFC-BOOST unit further directly supplies power to a dc bus of the charging pile.

When the energy of the photovoltaic power supply is accessed, the maximum power point tracking is performed through the MPPT control, then the energy is sent to the PFC-BOOST controller to be boosted for a long time to obtain a direct current voltage of about 850V and then supplied to the direct current bus, and meanwhile, the direct current bus voltage of 850V is supplied to the inverter of the second DC/DC primary isolation direct current source to provide an isolation direct current source.

Referring to fig. 4, the reserve battery input device includes a rectification module, a PFC-DC boost module, and a first DCDC isolation primary DC module, an input end of the rectification module is connected to a power grid, and an output end of the rectification module sequentially passes through the PFC-DC boost module and the first DCDC isolation primary DC module to output an isolated DC power. In this embodiment, the PFC-DC boost module is further electrically connected to the control device.

It should be noted that, when the reserve battery is sent to the PFC-BOOST after passing through the battery management BMS, and the battery is boosted by the PFC-BOOST and then selectively operated under the control of the central control unit, and when both the wind energy and the light energy are weak, the central control unit turns on the PID to selectively adjust the DC bus power supply according to the required energy and supply the power to the first DC/DC primary isolated DC source.

Referring to fig. 5, the power grid power input device includes a battery management module, a PFC-BOOST module, and a second DCDC isolated primary dc module, wherein an input end of the battery management module is connected to a reserve battery, and an output end of the battery management module sequentially passes through the PFC-BOOST module and the second DCDC isolated primary dc module to output an isolated dc power. In this embodiment, on one hand, the PFC-BOOST module is further electrically connected to the control device, and on the other hand, the PFC-BOOST module is further configured to directly supply power to a dc bus of the charging pile.

It should be noted that when the power input of the power grid is sent to the PFC-DC through the rectifier, the PFC-DC selectively operates under the control of the central control unit, and when the wind energy and the light energy are sufficient, the central control unit shuts off the power grid PFC-DC and is completely powered by the wind energy and the light energy. And a second DC/DC primary isolation direct current source of the power grid does not supply power to the direct current bus.

In addition, it should be noted that when the energy of the wind energy and light energy storage battery is insufficient, the central control unit turns on the grid PFC-DC, and the grid power supply supplies power to the DC bus; the DC/DC primary isolation direct current source supplies power. And the DC/DC module charges the reserve battery in reverse. When the wind energy and the light energy are sufficient, the wind energy and the light energy supply power to the inversion direct current bus, and the power is output through the three-phase four-wire vector inverter and the combination switch and is sent to the outside to provide an alternating current power supply. And a direct current bus power supply of the charging pile is sent to the DC/DC power module, and the DC/DC power module is used for carrying out power distribution by the central controller and then sending to the direct current rapid charging pile. When the wind energy and light energy reserve battery energy is insufficient, the central control unit operates the power grid power supply to input to obtain the charging pile direct current bus power supply, the DC/DC power module is powered by the power grid energy, and the central control unit operates the combination switch to transmit the power grid to the outside for use.

Referring to fig. 6, the control device includes a central control unit, an MCU processing unit, a wireless transmission unit and a display unit, the central control unit is electrically connected to the wind power input device, the photovoltaic power input device, the reserve battery input device, the grid power input device, the dc current sensor, the three-phase four-wire vector inverter and the combination switch device, the central control unit is also electrically connected to the MCU processing unit, and the MCU processing unit is electrically connected to the wireless transmission unit and the display unit. Furthermore, the wireless transmission unit adopts a three-in-one DTU which is independently researched and developed, the network can be automatically switched, meanwhile, according to the selection of a customer, the DTU adopts three modes of WIFI, 4-5G and Ethernet, all data can be transmitted in real time to be sent to the big data platform, and meanwhile, the platform can issue instructions to the equipment in real time. Various aspects of the operation of the device are monitored. The display unit is a display screen which displays the running condition in real time and comprises data of voltage, current, temperature, power and the like;

it should be noted that the control device further comprises a temperature control unit, a PFC control unit, an MPPT unit, a voltage and current acquisition unit, a three-phase H-bridge control unit, a combination switch unit, a low-pass filter unit, a DC/DC power module, a power distribution unit, and a BMS charging and discharging unit, and the central control unit is electrically connected with the temperature control unit, the PFC control unit, the MPPT unit, the voltage and current acquisition unit, the three-phase H-bridge control unit, the combination switch unit, the low-pass filter unit, the DC/DC power module, the power distribution unit, and the BMS charging and discharging unit, respectively.

The temperature control unit collects the key temperature of each part and returns the key temperature to the central control unit, and the central control unit sends the obtained temperature to the MCU/DSP processor to protect each key unit. The PFC control unit is mainly responsible for realizing boosting, further boosting the direct-current voltage in the rectifier and sending the direct-current voltage to two paths of direct-current buses, and meanwhile, improving the power factor of the alternating-current buses. The MPPT unit is mainly responsible for tracking the maximum power of the solar photovoltaic cell, when the solar energy is the most sufficient, the MPPT gives information to the central controller, other direct current bus power supplies are reduced, and the MPPT is matched with energy balance states of all the power supplies. The voltage and current acquisition unit sends the direct current and alternating current of each part to the central operation unit to calculate the power and the load state. The working condition of each part is detected. The three-phase H-bridge control unit is a main power supply inversion unit in the station and inverts a direct-current bus power supply into an alternating-current power supply to be supplied to parts of the station needing the alternating-current power supply. The combined switch unit is mainly responsible for the conversion of the power grid power supply and the output of the inverter power supply. The low-pass filtering unit is mainly responsible for removing the high frequency of the inversion unit and keeping the low-frequency power supply voltage of the inversion unit. And simultaneously, high-frequency interference in the power supply is removed. The DC/DC power module consists of an IGBT full-bridge phase-shift switch group, and provides a main direct-current charging power supply for the charging pile. The power distribution unit is mainly used for scheduling the charging voltage and current of each charging gun. The BMS charging and discharging unit is mainly responsible for charging and discharging management work of the backup battery.

Further, the description is given in conjunction with an actual design.

Referring to fig. 7 to 10, when the utility power passes through the rectifying unit, the ac power is rectified into a dc pulsating power, and at this time, the PFC chip detects a dc pulsating voltage of about 550V, and when the central control unit detects that the wind energy and the light energy are insufficient, the PFC chip starts to operate, and after pulse width modulation by the cascode IGBT, the voltage is raised to 850V, and after filtering by the filter capacitor, the voltage is output, and the solar battery is input to the second PFC processor through the MPPT, and the dc voltage of 600V is raised to 850V, and when the MPPT tracks the maximum solar power point, the main power is supplied by the solar energy, and the power grid PFC chip stops operating. Specifically, referring to fig. 7, the rectifying unit includes diodes D8 to D13, and the PFC-DC boost unit includes a PFC chip U3, a cascode IGBT switch U4, transformers T3 and T4, a diode D5D6, and the like.

It should be noted that, when the solar cell panel works, the solar power is input to the MPPT, the MPPT sends the maximum power point information to the MCU processor, and the dc isolation circuit works to separate the power of the photovoltaic cell from the solar cell panel to achieve the purpose of safety, and the chip U1 starts the interleaved PWM debugging after obtaining the photovoltaic voltage, and raises the photovoltaic voltage to 820V, and feeds back the voltage to the chip U1 through the resistor R11 and the resistor R18. The transformer T1 and the transformer T2 are current transformers, and feed the current of the solar cell back to the chip U1 in real time, and maximum current tracking is carried out. Specifically, referring to fig. 7, the PFC-BOOST unit includes a PFC chip U1, a cascode IGBT switch U2, transformers T1 and T2, a diode D1D2, and the like.

The principle of mains supply PFC-DC is the same as that of solar energy PFC-BOOST, but the PFC voltage of the solar energy is 20V higher than that of the mains supply PFC because when the voltage and the current of the solar cell are sufficient, the resistor R11 and the resistor R18 of the mains supply PFC send the feedback voltage to the chip U1 for processing, and because the feedback value of the chip U3 is 830V, the output is 850V, the solar cell forces the power grid PFC to stop working and is completely powered by solar energy or wind energy.

When the duty ratio of the solar PFC is maximum but the output voltage is only 830V, the solar PFC and the mains PFC work simultaneously according to requirements, and the mains and the solar energy work cooperatively.

When the maximum output of the PFC of the solar PFC wind power PFC reserve battery is lower than 800V, the three PFCs track the energy shortage, and the central controller feeds back the obtained information to the MCU to stop working. Is completely powered by mains supply.

By the method, the maximum output point, the balance point and the minimum point of each energy package can be effectively tracked. The energy of the three energy packs is extracted to the maximum capacity, and simultaneously, the energy can be secondarily combined with commercial power, so that the effects of identifying cloudy days, cloudy days and sunny days and achieving the effect of recycling the wind energy are achieved.

It should be noted that, when the wind energy power passes through the rectifying unit, the power is rectified into a dc pulsating power, the PFC chip starts to operate, and the voltage is raised to 850V after pulse width modulation by the common-emitter IGBT, so as to achieve dc output.

It should be noted that, when the battery energy pack works, the battery voltage is input into the battery management system, the battery management system supplies power to the MCU processor, and the dc isolation circuit works to send the power of the battery energy pack to the chip U1, and the chip U1 starts the interleaved PWM debugging after obtaining the battery voltage, so as to raise the battery voltage to 850V.

Referring to fig. 11 and 12, the DC/DC isolated primary DC power supply mainly provides a DC power supply isolated from the DC bus power supply output by the PFC for the following three-phase four-wire inverter circuit, and the DC power supply enters the IGBT full-bridge phase shift modules (1 and 2) after being output by the PFC, and is driven by the full-bridge phase shift chip to send out phase shift PWM, so as to drive the IGBT full-bridge phase shift power tube to operate.

The direct current bus voltage is applied to the IGBT full-bridge phase-shifting module (1, 2), phase-shifting signals are sent by the phase-shifting control chips U11 and U12 to drive the phase-shifting driving transformers T3, T4, T6 and T7 to work so as to send the phase-shifting driving signals to the IGBT grid electrode, synchronous rectification driving signals are sent by the driving transformers T3, T4, T6 and T7 to drive a rear electrode rectifier tube to work, the voltage is stabilized by a voltage stabilizing controller circuit, therefore, the direct current output of two poles is 250V, and the safety direct current voltage after superposition is 500V. By means of LLC soft switching phase shift, the efficiency can reach over 96%, and the power of one-pole DC is equal to that of two-pole DC, so that the neutral point voltage will not deviate during output and the three-phase vector sum is always maintained at zero potential. The neutral point voltage deviation generated when the neutral point voltage in a voltage division mode is unbalanced due to the load is effectively solved.

Because a phase-shifting soft switching mode is adopted, the frequency is fixed, and only phase shifting angles are different, so that the front stage realizes zero voltage ZVS starting, and the rear stage realizes zero current ZCS switching-off.

Referring to fig. 13 and 14, two sets of dc power supplies are connected in series and then connected to the three-phase H-bridge controller, and the DSP sends out an SPWM driving signal to drive the IGBT to operate, where the IGBT includes IGBT switching tubes U1 to U6, and outputs a three-phase vector ac power after passing through the LC low-pass filter. Then single-phase alternating current is output from the midpoint of the direct current power supply. This approach does not introduce neutral point shifts due to load imbalance. Meanwhile, vector adjustment can be carried out on single phase and three phases.

Referring to fig. 15 and 16, after the driving power supply is operated, the +5V power supply is sent to the DSP, and the DSP starts to operate, so as to collect the required information, such as temperature, voltage, frequency, phase, etc., through the external interfaces. When all the work is ready to be normal, the DSP sends SPWM driving signals to the driving modules U2-U6, and the driving signals are sent to the IGBT to drive the IGBT to work. R7 may operate on the output frequency, R8-R9-R10 may adjust the A, B, C phase voltages, and SW1 may adjust the phase.

Referring to fig. 17, after the auxiliary power supply starts to operate, a 24V power supply is sent to the U2 chip, 15V voltage is separated, and the voltage is processed by the U4 push-pull chip, and then the voltage is supplied to the voltage-dividing transformers T1 to T5, so that 10 groups of fully-isolated power supplies are obtained to supply power to the DSP, the MCU, and the IGBT driving group, respectively. This has the advantage that the power supply of each chip is isolated and the individual operation does not interfere with the operation of other devices.

Referring to fig. 18, the dc bus power supply is sent to the IGBT phase-shifted full bridge, the output voltage is adjusted by changing the phase shift angle according to the information sent to the central controller by the DSP/MCU, the front stage employs IGBT phase-shifted control, and the rear stage employs synchronous rectification, which has high stability under high power output.

Referring to fig. 19, the combination switch unit is a controller that distributes the grid power and the three-phase four-wire inverter unit, and the three-phase four-wire power is provided by the inverter when the three energy sources have energy, and the grid power is used to supply power when the three energy sources have no energy or are insufficient.

Referring to fig. 20, the power distribution unit integrates the energy of the DC/DC charging modules, and reasonably distributes the DC energy through matrix or daisy connection under the condition that the new energy vehicle can receive super fast charging. The power needs to be distributed in a gradient manner, and the charging pile achieving the power needs to be a super quick charging, quick charging and common charging destination.

The invention adopts IGBT modulus module type, and has the advantages of sufficient power density, high stability and small volume. The condition of totally depending on the power grid is changed, four energy sources are integrated, and the wind and light reserve mode is really realized. Carbon emission is reduced; the problem of waste battery treatment of the new energy electric automobile is solved, and the batteries are recycled. The problem of power allocation of multiple piles is solved, and the flexibility of changing power of the charging pile is changed by adopting multi-module combination; the problem of alternating current energy of the charging station is solved, and the charging pile can be charged completely to provide alternating current and direct current energy.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. The utility model provides a wind-solar reserve formula IGBT reversible type direct current fills electric pile fast which characterized in that includes: a wind power input device, a photovoltaic power input device, a reserve battery input device, a power grid input device, a direct current sensor, a three-phase four-wire vector inverter, a combined switch device and a control device,

2. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 1, characterized in that the wind power input device comprises a rectifying unit, a PFC-DC boosting unit and a first DCDC isolating primary direct current unit, wherein an input end of the rectifying unit is connected with a wind power, and an output end of the rectifying unit sequentially passes through the PFC-DC boosting unit and the first DCDC isolating primary direct current unit to output isolated direct current power.

3. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 2, characterized in that the PFC-DC boosting unit also directly supplies power to a direct current bus of the charging pile.

4. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 1, characterized in that the photovoltaic power input device comprises a photovoltaic MPPT control unit, a PFC-BOOST boosting unit and a second DCDC isolation primary direct current unit, the input end of the photovoltaic MPPT control unit is connected to a photovoltaic power, and the output end of the photovoltaic MPPT control unit sequentially outputs the isolated direct current power through the PFC-BOOST boosting unit and the second DCDC isolation primary direct current unit.

5. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 4, characterized in that the PFC-BOOST unit also directly supplies power to a direct current bus of the charging pile.

6. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 1, characterized in that the reserve battery input device comprises a rectification module, a PFC-DC boost module and a first DCDC isolation primary direct current module, wherein an input end of the rectification module is connected to a power grid power supply, and an output end of the rectification module sequentially passes through the PFC-DC boost module and the first DCDC isolation primary direct current module to output isolated direct current power supply.

7. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 6, characterized in that the PFC-DC boost module is also electrically connected with the control device.

8. The wind-solar energy reserve type IGBT reversible direct current rapid charging pile according to claim 1, characterized in that the power grid power input device comprises a battery management module, a PFC-BOOST BOOST module and a second DCDC isolation primary direct current module, wherein an input end of the battery management module is connected to a reserve battery, and an output end of the battery management module sequentially passes through the PFC-BOOST BOOST module and the second DCDC isolation primary direct current module to output isolated direct current power.

9. The wind-solar energy reserve type IGBT reversible dc fast charging pile according to claim 8, characterized in that the PFC-BOOST module is further electrically connected to the control device, and the PFC-BOOST module further directly supplies power to a dc bus of the charging pile.

10. The wind-solar energy reserve type IGBT reversible direct-current rapid charging pile according to any one of claims 1~9, wherein the control device comprises a central control unit, an MCU processing unit, a wireless transmission unit and a display unit, the central control unit is electrically connected to the wind power input device, the photovoltaic power input device, the reserve battery input device, the grid power input device, the direct current sensor, the three-phase four-wire vector inverter and the combination switch device, respectively, the central control unit is further electrically connected to the MCU processing unit, and the MCU processing unit is electrically connected to the wireless transmission unit and the display unit, respectively.