JP3243443U - Thermal power generation high voltage directly connected energy storage reserve station power supply system - Google Patents

Abstract

The present invention provides a power supply system in a thermal power generation high voltage directly connected energy storage standby station that can improve the reliability of power supply to a thermal power plant. A thermal power generation high voltage directly connected energy storage backup station internal power supply system includes a thermal power generation system interconnection standby transformer unit, an energy storage power supply unit and a thermal power plant internal unit, wherein the thermal power generation system interconnection standby transformer unit comprises: The energy storage and power supply unit is connected to the unit in the thermal power plant, and the energy storage and power supply unit includes the energy storage equipment, the energy storage equipment AC/DC converter, the energy storage equipment disconnecting switch, the energy storage step-up transformer, and the energy storage grid connection switch. have. By directly installing the energy storage and power supply unit on the low voltage side of the thermal power unit standby transformer, it can be connected in parallel with the thermal power unit as a stable voltage source, participate in the frequency adjustment process of the power grid, and serve as a 400V load standby power source in the station. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to the technical field of backup station power supply system, and more particularly to a thermal power generation high voltage direct-connected energy storage backup station power supply system.

As one of the key technological supports for the energy transformation, large-scale energy storage technology has gained widespread acceptance within the industry in recent years, as it can provide the power grid with many ancillary services such as peak regulation, frequency modulation, and emergency power supply. Attention has been paid. The mixed energy storage system, which consists of a combination of electrochemical energy storage + lithium battery, is connected to the thermal power generation unit by a converter, has power bi-directional flow capability, quick power adjustment, diverse applied power supply modes, etc. There are advantages. However, the energy storage equipment connected to the conventional thermal power unit can only realize the power supply by relying on the high voltage station transformer, so the electrical energy loss is large and the voltage provided by the energy storage system is not stable.

The present invention provides a thermal power high-voltage direct-connected energy storage reserve power supply system to at least solve the technical problems in the related art of direct-connected, large electrical energy loss and unstable voltage.

An embodiment of the first aspect of the present invention is a thermal power generation high voltage directly connected energy storage standby station power supply system, comprising a thermal power grid interconnection standby transformer unit, an energy storage feeding unit and a thermal power station internal unit, wherein the thermal power A power grid interconnection standby transformer unit is respectively connected to the energy storage and feeding unit and the thermal power plant internal unit, the energy storage and feeding unit is connected to the thermal power plant internal unit, and the thermal power grid interconnection preliminary transformation. said energy storage and feeding unit is for feeding said thermal power plant internal unit when said generator shuts down due to a power grid outage, said thermal power plant The on-site unit receives the electric energy provided by the energy storage and power supply unit to operate the on-site load in the thermal power plant on-site unit, and the energy storage and power supply unit comprises an energy storage facility, an energy A thermal power generation high voltage direct-connected energy storage backup station power supply system is provided, which includes a storage facility AC/DC converter, an energy storage facility disconnect switch, an energy storage step-up transformer, and an energy storage grid connection switch.

Preferably, said energy storage and feeding unit further feeds said thermal power grid standby transformer unit when said generator is in no-load condition.

Preferably, the thermal power system interconnection standby transformer unit comprises a thermal power system interconnection bus, a generator main transformer, a split winding standby transformer, a standby transformer low voltage side first branch bus and a standby transformer low voltage side A second branch bus is further provided, the generator is connected to the thermal power generation system interconnection bus by the generator main transformer, and the high voltage side of the split winding auxiliary transformer is connected to the thermal power generation system interconnection bus. and the low voltage side of the split winding pre-transformer is connected to the pre-transformer low-voltage side first branch bus and the pre-transformer low-voltage side second branch bus, respectively.

More preferably, the energy storage facility AC/DC converter, the energy storage facility disconnect switch, the energy storage step-up transformer, and the energy storage system interconnection switch are connected in sequence, and the energy storage facility AC/DC converter is connected to the energy storage facility. , the energy storage system interconnection switch is connected to the low-voltage side second branch bus of the standby transformer, and the energy storage facility AC/DC converter converts the low-voltage DC current generated from the energy storage facility into a low-voltage AC current. It is for conversion.

More preferably, the energy storage and power supply unit further has an on-site standby bus, one end of the on-site standby bus is connected to the energy storage step-up transformer, and the other end of the on-site standby bus is connected to the thermal power plant internal unit. Connected.

More preferably, the unit in the thermal power station comprises the station load, the high voltage station transformer bus, the split winding high voltage station transformer, the high voltage station transformer low voltage side first branch bus, and the high voltage station transformer low voltage side second branch bus. , a low voltage station grid connection switch, a double winding low voltage station transformer, a station bus, a low voltage backup power supply switch and a low voltage load switch, wherein the high voltage side of said split winding high voltage station transformer is connected by said high voltage station transformer bus. connected to the outlet of the generator, the low-voltage side of the split-winding high-voltage indoor transformer being connected to the high-voltage indoor transformer low-voltage side first branch bus and the high-voltage indoor transformer low-voltage side second branch bus, respectively; The in-station transformer low-voltage side second branch bus is connected to the double-winding low-voltage in-station transformer by the low-voltage in-station system interconnection switch, the double-winding low-voltage in-station transformer is connected to the in-station bus, and the in-station A load has a low voltage load, the low voltage load is connected to the domestic bus by the low voltage load switch, and the energy storage and feeding unit is connected to the domestic bus by the low voltage standby feeding switch.

More preferably, the unit in the thermal power plant further has a high voltage first load switch and a high voltage second load switch,
The plant load further includes a thermal power plant high voltage class 1 load and a thermal power plant high voltage class 2 load, and the thermal power plant high voltage class 1 load is switched by the high voltage first load switch to switch the low voltage side first branch bus of the high voltage station transformer. , and the second class high-voltage load in the thermal power plant is connected to the second branch bus on the low-voltage side of the transformer in the high-voltage station by the second high-voltage load switch.

More preferably, the thermal power grid-connected standby transformer unit further transmits the electrical energy provided by the energy storage and feeding unit back to the thermal power plant internal unit when the generator stops due to a power grid failure. do.

More preferably, the energy storage and power supply unit further disconnects the energy storage grid connection switch to supply electrical energy to the low voltage load when the low voltage load requires electrical energy.

More preferably, a closing switch is installed between the energy storage grid connection switch and the low voltage standby power switch.

The technical solutions provided by the embodiments of the present invention have at least the following beneficial effects.

The present invention provides a thermal power high voltage directly connected energy storage backup station power supply system, comprising a thermal power grid interconnection standby transformer unit, an energy storage feeding unit and a thermal power station internal unit, and a thermal power grid interconnection backup transformer unit. is connected to the energy storage and feeding unit and the unit in the thermal power plant respectively, the energy storage and feeding unit is connected to the unit in the thermal power plant, the thermal power grid interconnection standby transformer unit has a generator, and the thermal power grid interconnection standby The transformer unit is for generating electricity using the generator, and the energy storage and power supply unit is for supplying power to the unit in the thermal power plant when the generator stops due to a blackout in the power grid. The on-site unit is for receiving electrical energy provided by the energy storage and power supply unit to drive on-site loads within the thermal power plant on-site unit, wherein the energy storage and power supply unit comprises an energy storage facility, It has an energy storage equipment AC/DC converter, an energy storage equipment disconnecting switch, an energy storage step-up transformer and an energy storage grid connection switch. The present invention connects the energy storage and feeding unit to the thermal power grid connection standby transformer unit, that is, directly installs the energy storage and feeding unit on the low voltage side of the thermal power unit standby transformer, so that the thermal power unit as a stable voltage source , it can participate in the frequency adjustment process of the power grid, and can improve the reliability of power supply to the thermal power plant as a 400V load standby power source in the station.

Additional aspects and advantages of the invention will be set forth in part from the description that follows, and in part will be apparent from the description, or may be learned by practice of the invention.

The above and/or additional aspects and advantages of the present invention will become clearer and easier to understand from the following description of embodiments accompanying the drawings.
1 is a block diagram of a thermal power high voltage direct-connected energy storage reserve power supply system provided by an embodiment of the present invention; FIG. 1 is a schematic structural diagram of an energy storage and feeding unit provided by an embodiment of the present invention; FIG. 1 is a schematic structural diagram of a thermal power grid interconnection standby transformer unit provided by an embodiment of the present invention; FIG. 1 is a schematic structural diagram of a unit in a thermal power plant provided by an embodiment of the present invention; FIG. 1 is a schematic structural diagram of a thermal power high voltage direct-connected energy storage backup station power supply system provided by an embodiment of the present invention; FIG.

The following is a detailed description of embodiments of the present invention, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only for the purpose of explaining the present invention and should not be understood as limiting the present invention.

The present invention provides a thermal power generation high voltage directly connected energy storage standby station power supply system. Here, the thermal power generation high voltage directly connected energy storage reserve station power supply system includes a thermal power grid connection standby transformer unit, an energy storage power supply unit and a thermal power station internal unit, and the thermal power generation grid connection standby transformer unit is an energy storage The power supply unit and the thermal power plant internal unit are respectively connected, the energy storage power supply unit is connected to the thermal power plant internal unit, the thermal power grid interconnection standby transformer unit has a generator, and the thermal power grid interconnection standby transformer unit is for generating electricity using the generator, and the energy storage and power supply unit is for supplying power to the unit in the thermal power plant when the generator stops due to a blackout in the power grid, and the unit in the thermal power plant is , is for receiving electric energy provided by the energy storage and power supply unit to operate the on-site load in the unit in the thermal power plant, the energy storage and power supply unit comprising an energy storage facility, an energy storage facility AC/DC converter, It has an energy storage facility disconnect switch, an energy storage step-up transformer and an energy storage grid connection switch. The technical solution provided by the present invention is to install the energy storage and feeding unit directly on the low voltage side of the thermal power unit standby transformer, so that it can be connected in parallel with the thermal power unit as a stable voltage source and participate in the frequency regulation process of the power grid. At the same time, it is possible to improve the reliability of power supply to a thermal power plant as an in-house 400V load standby power source.

The thermal power high voltage directly connected energy storage standby station power supply system according to the embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a thermal power high voltage direct-connected energy storage reserve power system provided by an embodiment of the present invention. As shown in FIG. It comprises a thermal power grid interconnection standby transformer unit 1 , an energy storage power supply unit 2 and a thermal power plant internal unit 3 .
The thermal power grid interconnection standby transformer unit 1 is connected to the energy storage and power supply unit 2 and the thermal power plant internal unit 3 , and the energy storage and power supply unit 2 is connected to the thermal power plant internal unit 3 .

In the embodiment of the present invention, the thermal power grid interconnection standby transformer unit 1 has a generator 1-1 for generating electricity.
The energy storage and power supply unit 2 is for powering the unit 3 in the thermal power plant when the generator 1-1 stops due to a power grid failure.
The thermal power plant internal unit 3 is for receiving the electric energy provided by the energy storage and power supply unit 2 to operate the internal load 3-1 within the thermal power plant internal unit.
As shown in FIG. 2, the energy storage power supply unit 2 includes an energy storage facility 2-1, an energy storage facility AC/DC converter 2-2, an energy storage facility disconnect switch 2-3, and an energy storage step-up transformer 2-4. , an energy storage system interconnection switch 2-5 and an on-site standby bus 2-6.

Here, the energy storage equipment AC/DC converter 2-2, the energy storage equipment disconnecting switch 2-3, the energy storage step-up transformer 2-4, and the energy storage system interconnection switch 2-5 are connected in order, and the energy storage equipment AC/DC conversion The device 2-2 is connected to the energy storage facility 2-1, one end of the on-site standby bus 2-6 is connected to the energy storage step-up transformer 2-4, and the other end of the on-site standby bus 2-6 is connected to the thermal power plant internal unit 3, where the local standby bus 2-6 may be a local standby bus with a voltage of 400V.

The energy storage facility AC/DC converter 2-2 is for converting the low-voltage DC current generated from the energy storage facility 2-1 into a low-voltage AC current.

Exemplarily, the energy storage equipment 2-1 outputs electrical energy, the energy storage equipment AC/DC conversion device 2-2 converts the output electrical energy from low voltage direct current to low voltage alternating current, and disconnects the energy storage equipment. When the switch 2-3 is turned on to provide high-voltage electrical energy, the energy storage step-up transformer 2-4 boosts the low-voltage alternating current to obtain a high-voltage alternating current, and the energy storage grid connection switch 2- 5 conveys the high-voltage alternating current to the standby transformer low-voltage side second branch bus 1-6, and when low-voltage electrical energy is required, it is connected to the thermal power plant internal unit 3 via the on-site standby bus 2-6.

In an embodiment of the present invention, the energy storage and feeding unit 2 further feeds the thermal power grid interconnection standby transformer unit 1 when the generator 1-1 is in no-load condition.

As an example, when the generator 1-1 becomes unloaded due to a power grid outage, the voltage of the thermal power grid interconnection bus 1-2 in the thermal power grid interconnection standby transformer unit 1 quickly drops, To resume power supply to the thermal power generation unit, as shown in FIG. Power is supplied to generator 1-1, thereby resuming operation of the thermal power unit.

In the embodiment of the present invention, the energy storage and feeding unit 2 further performs frequency modulation by turning on the energy storage grid connection switch 2-5 according to the frequency modulation command during normal operation of the generator 1-1.

In addition, by controlling the energy storage facility AC/DC converter 2-2 to control the operation state of the energy storage facility 2-1, it responds to the frequency modulation command, and here, the energy storage facility AC/DC converter 2-2 is When controlling, the method of droop control can be used to achieve effective and ineffective decoupling control.

In some embodiments, when the method of droop control is used to achieve effective and ineffective decoupling control, the droop control for effective-angular frequency and reactive-voltage is realized according to the following formulas: can be done.

Here, ω is the output voltage angular frequency of the energy storage facility AC/DC converter 2-2, U is the output voltage amplitude of the energy storage facility AC/DC converter 2-2, and _ω0 is the energy storage facility AC/DC converter 2. -2 is the no-load output voltage angular frequency reference value, _U0 is the no-load output voltage amplitude reference value of the energy storage equipment AC/DC converter 2-2, m is the active power droop coefficient, and n is the reactive power is the droop coefficient, P is the active power distributed to the load connected to the energy storage facility AC/DC converter 2-2, and Q is distributed to the load connected to the energy storage facility AC/DC converter 2-2. Reactive power.

In the embodiment of the present invention, as shown in FIG. -3, further comprising a split winding pre-transformer 1-4, a pre-transformer low-voltage side first branch bus 1-5, and a pre-transformer low-voltage side second branch bus 1-6; The bus voltage corresponding to the branch bus 1-5 and the pre-transformer low-voltage side second branch bus 1-6 may be 6 KV,
Here, the generator 1-1 is connected to the thermal power system interconnection bus 1-2 via the generator main transformer 1-3, and the high voltage side of the split winding standby transformer 1-4 is connected to the thermal power system. The low-voltage side of the split winding pre-transformer 1-4 is connected to the pre-transformer low-voltage side first branch bus 1-5 and the pre-transformer low-voltage side second branch bus 1-6, respectively. be done.

As shown in FIG. 5, the energy storage system interconnection switch 2-5 is connected to the standby transformer low-voltage side second branch bus 1-6.

In the embodiment of the present invention, as shown in FIG. 4, the unit 3 in the thermal power station includes a station load 3-1, a high-voltage station transformer busbar 3-2, a split-winding high-voltage station transformer 3-3, a high-voltage station transformer Unit low-voltage side first branch bus 3-4, high-voltage station transformer low-voltage side second branch bus 3-5, low-voltage station grid connection switch 3-6, double winding low-voltage station transformer 3-7, station bus 3 -8, a low voltage pre-power switch 3-9 and a low voltage load switch 3-10. As shown in FIG. 5, the high voltage side of the split winding high voltage substation transformer 3-3 is connected to the outlet of the generator 1-1 by the high voltage substation transformer bus 3-2, and the split winding high voltage substation transformer 3- The low-voltage side of 3 is connected to the high-voltage station transformer low-voltage side first branch bus 3-4 and the high-voltage station transformer low-voltage side second branch bus 3-5, respectively, and the high-voltage station transformer low-voltage side second branch bus 3-5. is connected to a double-winding low-voltage station transformer 3-7 by a low-voltage station interconnection switch 3-6, and the double-winding low-voltage station transformer 3-7 is connected to a station bus 3-8, and a station load 3 -1 has a low voltage load 3-1-1 which is connected to the station bus 3-8 by a low voltage load switch 3-10, where the low voltage load 3-1-1 is 400V. It may be an on-site power load.

As shown in FIG. 5, the high voltage side of the split winding high voltage station transformer 3-3 is connected to the pre-transformer low voltage side first branch bus 1-5 by the high voltage station transformer bus 3-2. The low voltage side of the line high voltage station transformer 3-3 is connected to the high voltage station transformer low voltage side first branch bus 3-4 and the high voltage station transformer low voltage side second branch bus 3-5, respectively.

Further, the thermal power plant internal unit 3 further has a high voltage first load switch 3-11 and a high voltage second load switch 3-12.
The on-site load 3-1 further includes a thermal power plant internal high voltage class 1 load 3-1-2 and a thermal power plant internal high voltage class 2 load 3-1-3.
The thermal power plant high voltage first class load 3-1-2 is connected to the high voltage transformer low voltage side first branch bus 3-4 by the high voltage first load switch 3-11, and the thermal power plant high voltage second class load 3-1-3. is connected to the low-voltage side second branch bus 3-5 of the high-voltage station transformer by a high-voltage second load switch 3-12, and as shown in FIG. It is connected to the in-house bus 3-8.

In the embodiment of the present invention, as shown in FIG. 5, the thermal power grid connection standby transformer unit 1 is further provided by the energy storage and feeding unit 2 when the generator 1-1 stops due to power grid blackout. The electrical energy is transmitted back to the unit 3 in the thermal power plant.

Exemplarily, when the power generator 1-1 stops due to a power grid outage, the electrical energy provided by the energy storage and power supply unit 2 is transmitted back to the thermal power plant internal unit 3 to generate thermal power within the thermal power plant internal unit 3. It provides electric energy to the high voltage class 1 load 3-1-2 in the station or the high voltage class 2 load 3-1-3 in the thermal power plant.

In the embodiment of the present invention, the energy storage and power supply unit 2 further cuts off the energy storage grid connection switch 2-5 when the low voltage load 3-1-1 in the thermal power plant internal unit 3 needs electrical energy. , turns on the low-voltage standby power switch 3-9 to provide electrical energy to the low-voltage load 3-1-1.

In the embodiment of the present invention, a closing switch is installed between the energy storage grid connection switch 2-5 and the low voltage standby power supply switch 3-9.

Illustratively, when the energy storage grid connection switch 2-5 is turned on, the low voltage standby power supply switch 3-9 is in a closed state and is always cut off. When the low-voltage standby power supply switch 3-9 is turned on, the energy storage grid connection switch 2-5 is in the closed state, is always cut off, and is in the open state at the same time. Avoid damaging equipment 2-1.

The thermal power generation system interconnection standby transformer unit 1 further has an auxiliary machine attached to the generator 1-1.
Auxiliary machines have facilities such as water circulation pumps, oil circulation pumps, coal mills and boilers, auxiliary machines are used to convert coal into mechanical energy, and generator 1-1 converts mechanical energy into electrical energy. , the auxiliary machine constitutes a thermal power generation unit together with the generator 1-1, and when the power grid fails, the auxiliary machine stops, so the generator 1-1 stops, that is, the thermal power generation unit stops.

The electrical energy generated by the thermal power grid interconnection standby transformer unit 1 is provided to the load on the user side through the power transmission circuit, and the electrical energy generated by the thermal power grid interconnection standby transformer unit 1 is further supplied to thermal power generation. It can be provided to the on-site load 3-1 in the on-site unit 3.

Exemplarily, when the energy storage facility 2-1 cooperates with the thermal power generation unit to respond to the power grid frequency command, the energy storage grid connection switch 2-5 is turned on, and the low voltage standby power supply switch 3-9 is closed. Therefore, it cannot be turned on and is always shut off.

When the 400V on-site load, that is, the low-voltage load 3-1-1 requires power supply from the energy storage facility 2-1, the low-voltage standby power supply switch 3-9 is turned on, and the energy storage system interconnection switch 2-5 is closed. Since it is in the state, it cannot be turned on and is always in the cut-off state, realizing that the energy storage equipment 2-1 supplies power to the 400V on-site load.

As described above, the present embodiment provides a thermal power generation high voltage directly connected energy storage backup station power supply system, comprising a thermal power generation system interconnection standby transformer unit, an energy storage power supply unit, and a thermal power station internal unit. A system standby transformer unit is connected to the energy storage and feeding unit and the unit in the thermal power plant respectively, the thermal power system interconnection standby transformer unit has a generator, and the thermal power system interconnection standby transformer unit is for generating electricity using the generator, and the energy storage and power supply unit is for supplying power to the unit in the thermal power plant when the generator stops due to a power grid failure, and A thermal power plant internal unit has an internal load, said thermal power plant internal unit is for starting said internal load using electrical energy provided by said energy storage and feeding unit, wherein said energy The storage and power supply unit provides a thermal power high voltage direct-connected energy storage backup station power supply system, comprising an energy storage facility, an energy storage facility AC/DC converter, an energy storage facility disconnect switch, an energy storage step-up transformer and an energy storage grid connection switch. do. The technical solution provided by the present invention is to install the energy storage and feeding unit directly on the low voltage side of the thermal power unit standby transformer, so that it can be connected in parallel with the thermal power unit as a stable voltage source and participate in the frequency regulation process of the power grid. At the same time, the energy storage equipment can be used as a 400V on-site load standby power supply, which is consistent with the gist of the on-site load dual power supply of thermal power plants, and can achieve the stability of the equipment. Therefore, many of them are frequency converters, so the 400V bus voltage always fluctuates, which is disadvantageous for stable operation of the equipment. This can improve the reliability of powering the load.

In the present description, descriptions of reference terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to the embodiment or Refers to inclusion of a particular feature, structure, material or feature described for an example in at least one embodiment or example of the present invention. In this specification, exemplary statements for such terms do not necessarily refer to the same embodiment or example. And the specific features, structures, materials or features described may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method description illustrated in a flow chart or otherwise herein may be viewed as a module, fragment or portion representing code of instructions executable by one or more steps for performing a particular logical function or process. and the scope of preferred embodiments of the invention includes other implementations, not according to the order shown or discussed herein, but essentially concurrently, depending on the functionality involved. Including performing functions in order or in reverse order, this should be understood by those skilled in the art.

While the foregoing has shown and described embodiments of the present invention, the foregoing embodiments are intended to be illustrative and not to be construed as limitations on the present invention, which those skilled in the art will appreciate within the scope of the present invention. Changes, modifications, permutations and variations can be made to the above embodiments.

1 Thermal power grid interconnection standby transformer unit 2 Energy storage power supply unit 3 Unit in thermal power plant 1-1 Generator 1-2 Thermal power grid interconnection bus 1-3 Generator main transformer 1-4 Split winding standby transformer Unit 1-5 Pre-transformer low-voltage side first branch bus 1-6 Pre-transformer low-voltage side second branch bus 2-1 Energy storage facility 2-2 Energy storage facility AC/DC converter 2-3 Energy storage facility disconnect switch 2- 4 Energy storage step-up transformer 2-5 Energy storage grid connection switch 2-6 Station backup bus 3-1 Station load 3-2 High voltage station transformer bus 3-3 Split winding high voltage station transformer 3-4 High voltage station transformer Unit low-voltage side 1st branch bus 3-5 High-voltage station transformer low-voltage side 2nd branch bus 3-6 Low-voltage station grid connection switch 3-7 Double winding low-voltage station transformer 3-8 Station bus 3-9 Low-voltage spare Power supply switch 3-10 Low voltage load switch 3-1-1 Low voltage load 3-1-2 High voltage class 1 load in thermal power plant 3-1-3 High voltage class 2 load in thermal power plant 3-11 High voltage first load switch 3-12 High voltage Second load switch

Claims (10)

A power supply system in a thermal power generation high voltage directly connected energy storage reserve station,
Equipped with a thermal power grid connection standby transformer unit, an energy storage power supply unit and a thermal power plant internal unit,
The thermal power grid interconnection standby transformer unit is connected to the energy storage and power supply unit and the thermal power plant internal unit, respectively,
wherein the energy storage and feeding unit is connected to the unit in the thermal power plant;
The thermal power grid interconnection standby transformer unit has a generator for generating power,
wherein said energy storage and feeding unit is for feeding said unit in a thermal power plant when said generator stops due to a power grid outage;
for the thermal power plant internal unit to receive electrical energy provided by the energy storage and power supply unit to operate an internal load within the thermal power plant internal unit;
Thermal power generation high voltage directly connected energy, wherein the energy storage and power supply unit has an energy storage facility, an energy storage facility AC/DC converter, an energy storage facility disconnect switch, an energy storage step-up transformer, and an energy storage grid connection switch. Power supply system in the storage reserve. The thermal power high voltage direct-loaded energy of claim 1, characterized in that the energy storage and feeding unit further feeds the thermal power grid-tied standby transformer unit when the generator is in no-load condition. Power supply system in the storage reserve. The thermal power system interconnection standby transformer unit includes a thermal power system interconnection bus, a generator main transformer, a split winding standby transformer, a standby transformer low-voltage side first branch bus, and a standby transformer low-voltage side second branch. further having a busbar;
The generator is connected to the thermal power system interconnection bus by the generator main transformer,
The high voltage side of the split winding pre-transformer is connected to the thermal power generation system interconnection bus, and the low voltage side of the split winding pre-transformer is connected to the pre-transformer low-voltage side first branch bus and the pre-transformer low-voltage side second branch bus. 3. The system of claim 2, wherein the thermal power high voltage direct hookup energy storage standby station power supply system is connected to the branch bus respectively. The energy storage facility AC/DC converter, the energy storage facility disconnect switch, the energy storage step-up transformer and the energy storage system interconnection switch are connected in sequence,
The energy storage facility AC/DC converter is connected to the energy storage facility,
the energy storage system interconnection switch is connected to the standby transformer low-voltage side second branch bus,
4. The thermal power generation high voltage directly connected energy storage according to claim 3, wherein said energy storage equipment AC/DC converter is for converting low voltage DC current generated from said energy storage equipment into low voltage AC current. Standby power supply system. The energy storage and feeding unit further comprises an on-site standby busbar,
5. The thermal power generation high voltage transformer according to claim 4, wherein one end of said on-site standby bus is connected to said energy storage step-up transformer, and the other end of said on-site standby bus is connected to said thermal power plant internal unit. The power system in the hanging energy storage reserve station. The unit in the thermal power station comprises the station load, the high-voltage station transformer bus, the split-winding high-voltage station transformer, the high-voltage station transformer low-voltage side first branch bus, the high-voltage station transformer low-voltage side second branch bus, and the low-voltage station system. It has an interconnection switch, a double-wound low-voltage station transformer, a station bus, a low-voltage backup power supply switch and a low-voltage load switch,
A high voltage side of the split winding high voltage station transformer is connected to an outlet of the generator by the high voltage station transformer busbar, and a low voltage side of the split winding high voltage station transformer is connected to a low voltage side first branch busbar of the high voltage station transformer and a first branch busbar of the high voltage station transformer. connected to the high-voltage station transformer low-voltage side second branch bus,
the high-voltage station transformer low-voltage side second branch bus is connected to the double-winding low-voltage station transformer by the low-voltage station system interconnection switch;
the double-wound low-voltage station transformer is connected to the station bus,
the station load has a low voltage load, the low voltage load is connected to the station bus by the low voltage load switch;
6. The system of claim 5, wherein said energy storage and feeding unit is connected to said on-site bus by said low voltage standby power switch. The thermal power plant internal unit further comprises a high voltage first load switch and a high voltage second load switch,
The on-site load further includes a thermal power plant high voltage class 1 load and a thermal power plant high voltage class 2 load,
The first class high voltage load in the thermal power plant is connected to the first branch bus on the low voltage side of the transformer in the high voltage station by the first high voltage load switch,
7. The thermal power plant high voltage directly connected energy storage according to claim 6, wherein the high voltage second class load in the thermal power plant is connected to the low voltage side second branch bus of the high voltage transformer in the high voltage station by the second high voltage load switch. Standby power supply system. The thermal power grid connection standby transformer unit is further configured to transmit electrical energy provided by the energy storage and feeding unit back to the thermal power plant internal unit when the generator stops due to a power grid failure. The thermal power high voltage directly connected energy storage reserve station power supply system according to claim 7 . The energy storage and power supply unit is further characterized in that, when the low voltage load requires electrical energy, the energy storage grid connection switch is cut off to supply electrical energy to the low voltage load. 9. The thermal power generation high voltage directly connected energy storage backup station power supply system according to 8. 10. The system of claim 9, wherein a closing switch is installed between said energy storage grid connection switch and said low voltage standby power supply switch.