CN113422372A - Integrated charging station for transformer substation and control method - Google Patents
Integrated charging station for transformer substation and control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/51—Photovoltaic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/50—Charging stations characterised by energy-storage or power-generation means
- B60L53/53—Batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
Abstract
The application provides an integrated substation charging station and a control method. The charging station is provided with a voltage transformation system, a dynamic reactive power compensation device and a charging system compatible with various power sources. In this application, a dynamic reactive power compensator (SVG) provided in the transformer system can compensate for both inductive reactive power and capacitive reactive power. Direct current voltage that this dynamic reactive power compensation device was drawn forth can collect the direct current bus of integral type charging station to each port that connects through the bus is corresponding to be configured as for filling electric pile DC/DC converter and provides current input, thereby realizes charging electric automobile through the rifle output direct current electric signal that charges.
Description
Technical Field
The application relates to the field of charging station equipment, in particular to an integrated charging station for a transformer substation and a control method.
Background
The existing centralized charging station is composed of an AC/DC converter and a DC/DC converter, and the existing charging station needs to be respectively subjected to two-stage power conversion by the AC/DC converter and the DC/DC converter, so that the existing centralized charging station has the defects of complex circuit structure, high cost, large occupied area and low efficiency. In addition, in the charging process of the electric automobile, the charging current is large, the voltage loss is large, and the impact on the voltage of a power distribution network can be caused. The existing centralized charging station has no effective technology for solving the impact of the charging process of the electric automobile on the power grid.
The traditional transformer substation mostly adopts a fixed capacitor to compensate the reactive power. With the rapid development of urbanization, large and medium cities mostly adopt a cable power transmission mode, when a cable is heavily loaded, the load of a power grid presents an inductive reactive state, and when the cable is lightly loaded, the load presents a capacitive reactive state. When the traditional fixed capacitor is used for reactive compensation, the impedance is fixed, so that the compensation of the traditional fixed capacitor cannot meet the power factor requirement.
Disclosure of Invention
This application provides an integral type charging station and control method of transformer substation to prior art's not enough, and this application is through dynamic reactive power compensator (static var generator, SVG), both can compensate the inductive reactive, also can compensate the capacitive reactive, consequently, can reduce the impact to the distribution network, can also guarantee charge efficiency. The technical scheme is specifically adopted in the application.
First, in order to achieve the above object, a substation integrated charging station is provided, which includes: the transformer system is provided with a main transformer and at least one dynamic reactive power compensation device, wherein the high-voltage end of the main transformer is connected with the power distribution network, and the low-voltage end of the main transformer is connected with the dynamic reactive power compensation device and is used for carrying out voltage reduction treatment on the input voltage of the power distribution network; the dynamic reactive power compensation device is provided with a distribution transformer and a low-voltage AC/DC converter, wherein the high-voltage input end of the distribution transformer is connected with the low-voltage end of the main transformer, and the low-voltage output end of the distribution transformer is connected with the alternating-current input end of the low-voltage AC/DC converter and is used for providing reactive power compensation or active power compensation; further comprising: the charging system is provided with a direct current bus and at least one charging pile DC/DC converter, wherein one side of the direct current bus is connected with a direct current output end of the AC/DC converter, and the other side of the direct current bus is connected with an input end of the charging pile DC/DC converter; the output end of the charging pile DC/DC converter is connected with the output terminal of the charging gun and used for adjusting the direct current signal obtained by the direct current bus and outputting the direct current charging signal to charge the electric automobile.
Optionally, the substation integrated charging station as described in any above, wherein the charging system further includes: a photovoltaic power source and/or an energy storage cell; the photovoltaic power supply is connected to one side of the direct current bus through the unidirectional DC/DC converter, and preferentially outputs a direct current electrical signal to the direct current bus; the energy storage battery is connected to one side of the direct current bus through the bidirectional DC/DC converter, and outputs a direct current electric signal to the direct current bus, or adjusts the direct current electric signal obtained by the direct current bus to a battery charging voltage to charge the energy storage battery.
Optionally, the substation integrated charging station according to any one of the above embodiments, wherein the output terminal of each charging gun is independently electrically connected to the output terminal of one charging pile DC/DC converter.
Meanwhile, in order to achieve the above purpose, the present application further provides a control method for the substation integrated charging station described in any one of the above, which charges an electric vehicle according to the following steps: the method comprises the steps of firstly, acquiring state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the photovoltaic power supply is judged to be in a power generation state according to the state data of the photovoltaic power supply, outputting a direct current signal to the direct current bus by the photovoltaic power supply through a one-way DC/DC converter, adjusting the direct current signal into a direct current charging signal by a charging pile DC/DC converter, and outputting the direct current charging signal through an output terminal of a charging gun to charge an electric vehicle; secondly, after the photovoltaic power supply is judged to be in a non-power generation State according to the State data of the photovoltaic power supply, further acquiring SOC (State of charge) data of an energy storage battery, wherein the SOC data is used for reflecting the residual capacity of the battery and is numerically defined as the ratio of the residual capacity to the battery capacity and is usually expressed by percentage, when the energy storage battery is judged to be in a State suitable for energy supply according to the SOC data, the connection State of each port on the direct current bus is adjusted, the energy storage battery outputs a direct current signal to a direct current bus through a bidirectional DC/DC converter, the charging pile DC/DC converter adjusts the direct current signal into a direct current charging signal, and the direct current charging signal is output through an output terminal of a charging gun to charge the electric vehicle; and thirdly, after judging that the energy storage battery is in a state of improper energy supply according to the SOC data, further acquiring reactive state data of a dynamic reactive power compensation device, adjusting the connection state of each port on the direct current bus according to the reactive state data when judging that the dynamic reactive power compensation device is in a state of outputting capacitive reactive power compensation or when judging that the dynamic reactive power compensation device is in a state of outputting inductive reactive power compensation and has residual capacity, outputting a direct current electric signal to the direct current bus through a low-voltage AC/DC converter by the dynamic reactive power compensation device, adjusting the direct current electric signal into a direct current charging signal by the charging pile DC/DC converter, and outputting the direct current charging electric signal through an output terminal of a charging gun to charge the electric vehicle.
Optionally, the control method according to any one of the above further includes charging the energy storage battery when the SOC data of the battery is lower than the charging threshold according to the following steps: the method comprises the steps of obtaining state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the output power of the photovoltaic power supply is judged to be larger than the output power of a charging gun according to the state data of the photovoltaic power supply, enabling the photovoltaic power supply to output direct current electric signals to the direct current bus through a unidirectional DC/DC converter, enabling a bidirectional DC/DC converter to adjust the direct current electric signals into battery charging signals, and outputting the battery charging signals to an energy storage battery to charge the energy storage battery.
Optionally, the control method according to any one of the above, wherein the power of the battery charging signal does not exceed a difference between the output power of the photovoltaic power supply and the output power of the charging gun.
Optionally, in the control method, after the energy storage battery is fully charged, the dynamic reactive power compensation device is further triggered to provide active power compensation for the power distribution network output electric signal.
Optionally, the control method according to any one of the above, wherein the charging threshold is that SOC data of the battery is lower than 95%.
Optionally, in the control method as described above, in the second step, when the SOC data is greater than 30%, it is determined that the energy storage battery is in a state suitable for energy supply, and when the SOC data is less than 30%, it is determined that the energy storage battery is in a state unsuitable for energy supply.
Advantageous effects
A transformation system is arranged in the charging station, and a dynamic reactive power compensation device is also specially arranged in the transformation system. In addition, this application's charging station, its direct current bus still is connected with the charging system of multiple power through different ports respectively. Therefore, in the application, a dynamic reactive power compensator (SVG) provided in the transformer system can compensate inductive reactive power as well as capacitive reactive power. Direct current voltage that this dynamic reactive power compensation device was drawn forth can collect the direct current bus of integral type charging station to each port that connects through the bus is corresponding to be configured as for filling electric pile DC/DC converter and provides current input, thereby realizes charging electric automobile through the rifle output direct current electric signal that charges.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:
FIG. 1 is a functional block diagram of a substation integrated charging station of the present application;
FIG. 2 is a schematic flow chart illustrating the steps of charging an electric vehicle by the substation integrated charging station of the present application;
fig. 3 is a schematic flow chart illustrating steps of charging an energy storage battery by the substation integrated charging station according to the present application.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
Fig. 1 is a substation integrated charging station according to the present application. This transformer substation adopts SVG reactive compensation mode, can specifically set up to include:
transformation system, it has main transformer and at least one dynamic reactive power compensation device, wherein: the high-voltage end of the main transformer is connected with the power distribution network, and the low-voltage end of the main transformer is connected with the dynamic reactive power compensation device and is used for carrying out voltage reduction processing on the input voltage of the power distribution network; the dynamic reactive power compensation device is provided with a distribution transformer and a low-voltage AC/DC converter, wherein the high-voltage input end of the distribution transformer is connected with the low-voltage end of the main transformer, and the low-voltage output end of the distribution transformer is connected with the alternating-current input end of the low-voltage AC/DC converter and is used for providing reactive power compensation or active power compensation;
further comprising: the charging system is provided with a direct current bus and at least one charging pile DC/DC converter, wherein one side of the direct current bus is connected with a direct current output end of the AC/DC converter, and the other side of the direct current bus is connected with an input end of the charging pile DC/DC converter; the output end of the charging pile DC/DC converter is connected with the output terminal of the charging gun and used for adjusting the direct current signal obtained by the direct current bus and outputting the direct current charging signal to charge the electric automobile.
In some specific implementations, the dynamic reactive power compensation device SVG in the present application may be directly composed of a distribution transformer and a low voltage AC/DC converter. The 750V direct current voltage output by the AC/DC converter can be led out to a charging station to form a direct current bus, and the fluctuation of the bus current is compensated.
The charging system of the charging station can be further provided with a photovoltaic power supply, an energy storage battery and distributed charging guns, which are connected to a direct current bus through a DC/DC converter adapted to respective signal parameters. For example, the photovoltaic power supply is connected to one side of a direct current bus through a unidirectional DC/DC converter, and preferentially outputs a direct current electrical signal to the direct current bus; the energy storage battery is connected to one side of the direct current bus through the bidirectional DC/DC converter, and outputs a direct current electric signal to the direct current bus, or adjusts the direct current electric signal obtained by the direct current bus to a battery charging voltage to charge the energy storage battery.
Wherein, can set up each for guaranteeing the effect of charging the output terminal of rifle that charges equally divide respectively independently to be connected with the output of a stake DC/DC converter of charging.
The charging process can be carried out according to the priority set in fig. 2, so that the direct utilization efficiency of the environment-friendly energy is further improved through photovoltaic power supply, energy storage system power supply, SVG power supply or the combination of three different modes, the grid-connected loss of the photovoltaic equipment is reduced, and the electric energy utilization rate of the photovoltaic equipment is improved. In particular, the charging step may prioritize photovoltaic power charging, followed by energy storage system charging and SVG charging in sequence. The steps may be arranged to include:
the method comprises the steps of firstly, acquiring state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the photovoltaic power supply is judged to be in a power generation state according to the state data of the photovoltaic power supply, outputting a direct current signal to the direct current bus by the photovoltaic power supply through a one-way DC/DC converter, adjusting the direct current signal into a direct current charging signal by a charging pile DC/DC converter, and outputting the direct current charging signal through an output terminal of a charging gun to charge an electric vehicle;
secondly, further acquiring SOC data of an energy storage battery after the photovoltaic power supply is judged to be in a non-power generation state according to the state data of the photovoltaic power supply, adjusting the connection state of each port on the direct current bus when the energy storage battery is judged to be in a suitable power supply state according to the SOC data, outputting a direct current signal to the direct current bus by the energy storage battery through a bidirectional DC/DC converter, adjusting the direct current signal into a direct current charging signal by the charging pile DC/DC converter, and outputting the direct current charging signal through an output terminal of a charging gun to charge the electric vehicle;
and thirdly, after judging that the energy storage battery is in a state of improper energy supply according to the SOC data, further acquiring reactive state data of a dynamic reactive power compensation device, adjusting the connection state of each port on the direct current bus according to the reactive state data when judging that the dynamic reactive power compensation device is in a state of outputting capacitive reactive power compensation or when judging that the dynamic reactive power compensation device is in a state of outputting inductive reactive power compensation and has residual capacity, outputting a direct current electric signal to the direct current bus through a low-voltage AC/DC converter by the dynamic reactive power compensation device, adjusting the direct current electric signal into a direct current charging signal by the charging pile DC/DC converter, and outputting the direct current charging electric signal through an output terminal of a charging gun to charge the electric vehicle.
Therefore, the integrated substation charging station can directly charge the electric automobile by the photovoltaic power supply when the photovoltaic power supply generates electricity; when the photovoltaic power supply does not generate power or the generated power is insufficient, further judging: if the SOC of the energy storage system is more than 30%, controlling the energy storage system to charge the electric automobile; if the capacity of the energy storage system is insufficient, the system can be further supplemented by SVG. When whether the SVG is used for supplementing is judged, whether the SVG generates capacitive reactive power or not is judged, if yes, the SVG is controlled to charge the electric automobile, and the voltage quality of a power grid is improved by outputting active power. Otherwise, when the energy storage system generates inductive reactive power and has residual capacity, the residual capacity is used for charging the electric automobile.
In order to ensure that the energy storage battery can have sufficient electric energy to charge the electric vehicle, the present application may further charge the energy storage battery through the steps shown in fig. 3 when the SOC data of the battery is lower than the charging threshold, for example, the SOC data of the battery is lower than 95%. The steps can be specifically set as follows:
the method comprises the steps of obtaining state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the output power of the photovoltaic power supply is judged to be larger than the output power of a charging gun according to the state data of the photovoltaic power supply, enabling the photovoltaic power supply to output direct current electric signals to the direct current bus through a one-way DC/DC converter, enabling the two-way DC/DC converter to adjust the direct current electric signals into battery charging signals, and outputting the battery charging signals to an energy storage battery to charge the energy storage battery by utilizing the residual capacity of the photovoltaic power supply. After the energy storage battery is fully charged, the dynamic reactive power compensation device can be further triggered to provide active power compensation for the electric signal output by the power distribution network.
Therefore, the following effects can be achieved by the configuration mode of the dynamic reactive power compensation device and the three different power supply sources:
(1) utilize the centralized charging station of transformer substation construction, reduce the investment cost and the area of charging station, improve the efficiency that electric automobile charges.
(2) By adopting the optimized control scheme, the utilization rate of new energy resources such as photovoltaic energy and the like is improved, the transformer substation is arranged to provide a standby power supply for the charging station through the SVG, the system capacity of the charging station is increased, and the reliability of the system is improved.
(3) When photovoltaic power is greater than the power that fills electric pile and energy storage system needs, this application can also be through SVG for AC distribution network output active power, further improves the utilization ratio to the new forms of energy.
The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.
Claims (9)
1. A transformer substation integrated charging station, comprising:
transformation system having a main transformer and at least one dynamic reactive compensation device, wherein,
the high-voltage end of the main transformer is connected with the power distribution network, and the low-voltage end of the main transformer is connected with the dynamic reactive power compensation device and is used for carrying out voltage reduction processing on the input voltage of the power distribution network;
the dynamic reactive power compensation device is provided with a distribution transformer and a low-voltage AC/DC converter, wherein the high-voltage input end of the distribution transformer is connected with the low-voltage end of the main transformer, and the low-voltage output end of the distribution transformer is connected with the alternating-current input end of the low-voltage AC/DC converter and is used for providing reactive power compensation or active power compensation;
further comprising:
a charging system having a direct current bus and at least one charging post DC/DC converter, wherein,
one side of the direct current bus is connected with the direct current output end of the AC/DC converter, and the other side of the direct current bus is connected with the input end of the charging pile DC/DC converter;
the output end of the charging pile DC/DC converter is connected with the output terminal of the charging gun and used for adjusting the direct current signal obtained by the direct current bus and outputting the direct current charging signal to charge the electric automobile.
2. The substation integrated charging station of claim 1, wherein the charging system further comprises: a photovoltaic power source and/or an energy storage cell;
the photovoltaic power supply is connected to one side of the direct current bus through the unidirectional DC/DC converter, and preferentially outputs a direct current electrical signal to the direct current bus;
the energy storage battery is connected to one side of the direct current bus through the bidirectional DC/DC converter, and outputs a direct current electric signal to the direct current bus, or adjusts the direct current electric signal obtained by the direct current bus to a battery charging voltage to charge the energy storage battery.
3. The substation integrated charging station of claim 1, wherein the output terminals of each charging gun are each independently electrically connected to the output of a charging post DC/DC converter.
4. A control method for the substation integrated charging station according to any one of claims 1 to 3, characterized in that the electric vehicle is charged according to the following steps:
the method comprises the steps of firstly, acquiring state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the photovoltaic power supply is judged to be in a power generation state according to the state data of the photovoltaic power supply, outputting a direct current signal to the direct current bus by the photovoltaic power supply through a one-way DC/DC converter, adjusting the direct current signal into a direct current charging signal by a charging pile DC/DC converter, and outputting the direct current charging signal through an output terminal of a charging gun to charge an electric vehicle;
secondly, further acquiring SOC data of an energy storage battery after the photovoltaic power supply is judged to be in a non-power generation state according to the state data of the photovoltaic power supply, adjusting the connection state of each port on the direct current bus when the energy storage battery is judged to be in a suitable power supply state according to the SOC data, outputting a direct current signal to the direct current bus by the energy storage battery through a bidirectional DC/DC converter, adjusting the direct current signal into a direct current charging signal by the charging pile DC/DC converter, and outputting the direct current charging signal through an output terminal of a charging gun to charge the electric vehicle;
and thirdly, after judging that the energy storage battery is in a state of improper energy supply according to the SOC data, further acquiring reactive state data of a dynamic reactive power compensation device, adjusting the connection state of each port on the direct current bus according to the reactive state data when judging that the dynamic reactive power compensation device is in a state of outputting capacitive reactive power compensation or when judging that the dynamic reactive power compensation device is in a state of outputting inductive reactive power compensation and has residual capacity, outputting a direct current electric signal to the direct current bus through a low-voltage AC/DC converter by the dynamic reactive power compensation device, adjusting the direct current electric signal into a direct current charging signal by the charging pile DC/DC converter, and outputting the direct current charging electric signal through an output terminal of a charging gun to charge the electric vehicle.
5. The control method of claim 4, further comprising charging the energy storage battery when the SOC data of the battery is below a charging threshold according to the steps of:
the method comprises the steps of obtaining state data of a photovoltaic power supply, adjusting the connection state of each port on a direct current bus when the output power of the photovoltaic power supply is judged to be larger than the output power of a charging gun according to the state data of the photovoltaic power supply, enabling the photovoltaic power supply to output direct current electric signals to the direct current bus through a unidirectional DC/DC converter, enabling a bidirectional DC/DC converter to adjust the direct current electric signals into battery charging signals, and outputting the battery charging signals to an energy storage battery to charge the energy storage battery.
6. The control method of claim 5, wherein the battery charging signal has a power level that does not exceed a difference between the output power of the photovoltaic power source and the output power of a charging gun.
7. The control method according to claim 5, wherein the dynamic reactive power compensation device is further triggered to provide active compensation to the output electrical signal of the power distribution network after the energy storage battery is fully charged.
8. The control method according to claim 4, wherein the charging threshold is such that the SOC data of the battery is below 95%.
9. The control method according to claim 5, wherein in the second step, it is determined that the energy storage battery is in an appropriate energy supply state when the SOC data is greater than 30%, and it is determined that the energy storage battery is in an inappropriate energy supply state when the SOC data is less than 30%.
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