CN212343342U - Nuclear power plant frequency modulation control system - Google Patents

Nuclear power plant frequency modulation control system Download PDF

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Publication number
CN212343342U
CN212343342U CN202022173897.1U CN202022173897U CN212343342U CN 212343342 U CN212343342 U CN 212343342U CN 202022173897 U CN202022173897 U CN 202022173897U CN 212343342 U CN212343342 U CN 212343342U
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power
frequency modulation
energy storage
plant
bidirectional
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颜岩
黄晓杰
张治朝
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National Nuclear Demonstration Power Plant Co ltd
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National Nuclear Demonstration Power Plant Co ltd
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Abstract

The utility model discloses a nuclear power plant frequency modulation control system, include: the system comprises a scheduling control module, a power generation device, an energy storage device, a first voltage conversion device and a second voltage conversion device, wherein the energy storage device is used for realizing energy storage or discharge; the power generation device and the energy storage device are electrically connected with a tie line through the first voltage conversion device respectively; the power generation device and the energy storage device are electrically connected with a power supply bus in a plant through the second voltage conversion device respectively; the scheduling control module is used for acquiring a frequency modulation scheduling instruction, adjusting the output power of the power generation device according to the frequency modulation scheduling instruction, controlling the energy storage device to store or discharge energy according to the frequency modulation scheduling instruction, and adjusting the corresponding power. The utility model provides a nuclear power plant's frequency modulation control system participates in the electric wire netting frequency modulation through power generation facility and energy memory, and response speed is fast, is favorable to maintaining electric power system's safety and steady operation.

Description

Nuclear power plant frequency modulation control system
Technical Field
The utility model relates to a power supply technical field especially relates to a nuclear power plant frequency modulation control system.
Background
The frequency of the power system is used for reflecting the balance relation between active power generated by a generator in the power system and active power consumed by a load, and is an important control parameter for the operation of the power system, and the frequency modulation of the power system is a main measure for maintaining the balance of the supply and demand of the active power of the power system.
With the development of nuclear power technology, nuclear power plants are increasingly widely applied to power systems. The existing nuclear power plants comprise an active nuclear power plant and a Passive nuclear power plant, wherein the active nuclear power plant refers to a nuclear power plant adopting a 1E-level emergency diesel generator, the Passive nuclear power plant refers to a nuclear power plant adopting an AP1000, CAP1000 or CAP1400 technology, C represents a first letter of China, A represents an Advanced first letter, P represents a Passive first letter, 1000 represents an installed capacity of 100 ten thousand kilowatts, 1400 represents an installed capacity of 140 ten thousand kilowatts, and a standby diesel generator of the Passive nuclear power plant is a non-1E-level.
With the gradual increase of installed capacity of nuclear power, the switching of a nuclear power plant has a great influence on the stable operation of a power system, and therefore, the demand of the nuclear power plant for participating in power grid frequency regulation is increasing day by day. At present, the primary frequency modulation control is mainly adopted in the frequency modulation control of a nuclear power plant, the primary frequency modulation control is poor regulation, the power system is difficult to recover to operate under the rated frequency only depending on the primary frequency modulation, the frequency modulation efficiency is low, and the power quality is difficult to maintain.
SUMMERY OF THE UTILITY MODEL
The utility model provides a nuclear power plant's frequency modulation control system has solved the problem that nuclear power plant's frequency modulation is inefficient, is favorable to improving electric wire netting stability.
In a first aspect, an embodiment of the present invention provides a nuclear power plant frequency modulation control system, include: the system comprises a scheduling control module, a power generation device, an energy storage device, a first voltage conversion device and a second voltage conversion device, wherein the energy storage device is used for realizing energy storage or discharge; the power generation device and the energy storage device are electrically connected with a tie line through the first voltage conversion device respectively; the power generation device and the energy storage device are electrically connected with a power supply bus in a plant through the second voltage conversion device respectively; the scheduling control module is used for acquiring a frequency modulation scheduling instruction, adjusting the output power of the power generation device according to the frequency modulation scheduling instruction, controlling the energy storage device to store or discharge energy according to the frequency modulation scheduling instruction, and adjusting the corresponding power.
Optionally, the energy storage device comprises an electrochemical energy storage device and/or an aqueous storage energy storage device.
Optionally, the water storage and energy storage device comprises a water storage control unit, a water storage tank, a water pumping module and a hydroelectric generation module, wherein the output end of the hydroelectric generation module is electrically connected with the first voltage conversion device and the second voltage conversion device respectively; the water pumping module is connected with the reservoir through a water pumping pipeline, and the hydroelectric generation module is connected with the reservoir through a water discharging pipeline; the water storage control unit is electrically connected with the scheduling control module and is used for receiving a first frequency modulation scheduling instruction output by the scheduling control module and controlling the water pumping module or the hydroelectric generation module to work according to the first frequency modulation scheduling instruction; the water pumping module is used for conveying water to the reservoir to realize water storage and energy storage; the hydroelectric generation module is used for discharging water from the reservoir to realize water drainage and power generation.
Optionally, the electrochemical energy storage device includes a battery assembly, a bidirectional ac/dc conversion unit, and a charge/discharge control unit, the battery assembly is electrically connected to a dc side of the bidirectional ac/dc conversion unit, and the dc side of the bidirectional ac/dc conversion unit is electrically connected to the first voltage conversion device and the second voltage conversion device, respectively; the first end of the charge and discharge control unit is connected with the battery assembly, the second end of the charge and discharge control unit is connected with the scheduling control module, and the charge and discharge control unit is used for receiving a second frequency modulation scheduling instruction output by the scheduling control module and controlling the battery assembly to discharge outwards through the bidirectional alternating current-direct current conversion unit according to the second frequency modulation scheduling instruction; or, the bidirectional alternating current-direct current conversion unit is controlled to charge the battery pack.
Optionally, the nuclear power plant frequency modulation control system further includes a battery management unit, a first end of the battery management unit is connected to the battery assembly, a second end of the battery management unit is connected to the scheduling control module, and the battery management unit is configured to detect a voltage, a temperature, and a remaining power of the battery assembly, and send a detection result to the scheduling control module; the dispatching control module is further used for controlling the electrochemical energy storage device to charge or discharge according to the residual electric quantity and the second frequency modulation dispatching instruction, and adjusting charging and discharging power.
Optionally, the bidirectional AC-DC conversion unit includes an isolation circuit, a bidirectional DC/DC circuit, and a bidirectional DC/AC circuit, a first end of the isolation circuit is connected to the battery assembly, and a second end of the isolation circuit is connected to the first end of the bidirectional DC/DC circuit; the direct current end of the bidirectional DC/AC circuit is connected with the second end of the bidirectional DC/DC circuit, and the alternating current end of the bidirectional DC/AC circuit is electrically connected with the first voltage conversion device and the second voltage conversion device respectively.
Optionally, the battery assembly comprises any one of a lead-acid battery, a lithium ion battery, a flow battery, a sodium-sulfur battery, or a nickel-based battery.
Optionally, the nuclear power plant frequency modulation control system further comprises a standby generator set and a generator management unit, wherein an output end of the standby generator set is connected with a power supply bus in the plant; the generator management unit is used for detecting the rotating speed and the output voltage of the standby generator set and sending the rotating speed and the output voltage to the dispatching control module; the dispatching control module is also used for receiving a power failure fault signal, controlling the energy storage device to supply power to the power supply bus in the plant, controlling the standby generator set to start, and controlling the energy storage device to stop supplying power when the rotating speed reaches a preset rotating speed and the output voltage reaches a preset voltage.
The embodiment of the utility model provides a nuclear power plant frequency modulation control system sets up the dispatch control module, power generation facility, energy memory, first voltage conversion equipment and second voltage conversion equipment, power generation facility and energy memory are connected with the tie line electricity through first voltage conversion equipment respectively, adopt the dispatch control module to acquire the frequency modulation scheduling instruction, adjust power generation facility's output according to the frequency modulation scheduling instruction, and control energy memory or discharge according to the frequency modulation scheduling instruction, and adjust corresponding power, adjust the frequency deviation of electric wire netting and the power deviation of tie line; generating set and energy memory still are connected through second voltage conversion equipment and the interior power supply generating line electricity of factory, to the interior load power supply of factory, system simple structure, energy storage density is high, circulated use, energy memory switching response speed is fast, has solved the problem that nuclear power plant's frequency modulation is inefficient, is favorable to improving the electric wire netting stability, promotes energy memory's availability factor, the extension service life, promotion system security and feature of environmental protection improve the electric wire netting stability, improve electric energy quality.
Drawings
Fig. 1 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
The embodiment of the utility model provides a nuclear power plant frequency modulation control system, this embodiment is applicable in the application scene that the nuclear power plant who disposes energy memory participated in the electric wire netting frequency modulation. Fig. 1 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to an embodiment of the present invention.
As shown in fig. 1, the nuclear power plant frequency modulation control system 01 includes: the scheduling control module 10, the power generation device 20, the energy storage device 30, the first voltage conversion device 40 and the second voltage conversion device 50, wherein the energy storage device 30 is used for realizing energy storage or discharge; the power generation device 20 and the energy storage device 30 are electrically connected to the tie line T through the first voltage conversion device 40; the power generation device 20 and the energy storage device 30 are electrically connected to the in-plant power supply bus 003 through the second voltage conversion device 50; the scheduling control module 10 is configured to obtain a frequency modulation scheduling instruction, adjust the output power of the power generation apparatus 20 according to the frequency modulation scheduling instruction, control the energy storage apparatus 30 to store or discharge energy according to the frequency modulation scheduling instruction, and adjust the corresponding power.
The energy storage device 30 may be configured to implement conversion between electric energy and non-electric energy, typically, the non-electric energy may be mechanical energy or chemical energy, that is, the energy storage device 30 may be configured to implement mutual conversion between electric energy and mechanical energy or chemical energy, and implement energy storage and discharge.
In this embodiment, the tie line T is a special guide for connecting between the nuclear power plant and the power grid, and the tie line T is used for transmitting electric energy generated by the nuclear power plant to the power grid, or transmitting electric energy on the power grid to the nuclear power plant, where the power grid may be a 500kV or 220kV power system transmission network. The in-plant power supply bus L refers to an alternating current transmission bus in a nuclear power plant, the in-plant power utilization equipment 02 is electrically connected with the in-plant power supply bus L, the in-plant power supply bus L supplies power to the in-plant power utilization equipment 02, and the in-plant power utilization equipment 02 comprises important power utilization equipment in a reactor core waste heat discharge system. The power generation apparatus 20 refers to a power generation system provided in a nuclear power plant, and typically, the power generation apparatus 20 may include a turbine generator 201. The first voltage conversion device 40 and the second voltage conversion device 50 may be ac transformers, wherein the voltage on the first side of the first voltage conversion device 40 is equal to the output voltage of the power generation device 20, and the voltage on the second side of the first voltage conversion device 40 is equal to the transmission voltage of the off-plant grid; the voltage on the first side of the second voltage conversion device 50 is equal to the output voltage of the power generation device 20, and the voltage on the second side of the second voltage conversion device 50 is equal to the transmission voltage of the in-plant power supply bus L.
In this embodiment, after the nuclear power plant is connected to the power grid through the tie line T, the scheduling control module 10 may be configured to detect the frequency deviation Δ η of the power grid and the power deviation Δ P of the tie line T in real time, calculate the required adjustment power P according to a sum of the frequency deviation Δ η of the power grid and the power deviation Δ P of the tie line T, and generate the frequency modulation scheduling instruction, where the frequency modulation scheduling instruction includes the adjustment power P required for frequency modulation. Of course, the scheduling control module 10 may also directly obtain the frequency modulation scheduling instruction sent by the operator or the previous power scheduling system through the wireless communication network, which is not limited to this.
Specifically, the scheduling control module 10 analyzes the frequency modulation scheduling command according to a preset program, determines whether an adjustment power P required by frequency modulation is greater than zero, if the adjustment power P required by frequency modulation is greater than zero, the scheduling control module 10 controls the power generation device 20 to start, the first voltage conversion device 40 converts the output voltage of the power generation device 20 into a transmission voltage of an off-plant power grid, and provides a first power P1 for a tie line T, and at the same time, controls the energy storage device 30 to operate in a discharging state, the first voltage conversion device 40 converts the output voltage of the energy storage device 30 into a transmission voltage of the off-plant power grid, and provides a second power P2 for the tie line T, wherein the sum of the first power P1 and the second power P2 is equal to the adjustment power P; if the adjusting power P required by the frequency modulation is equal to zero, the scheduling control module 10 controls the power generation device 20 and the energy storage device 30 to be electrically disconnected from the first voltage conversion device 40, and energy interaction with an off-plant power grid is interrupted; if the adjusting power P required by the frequency modulation is less than zero, the scheduling control module 10 controls the power generation device 20 to stop and controls the energy storage device 30 to work in a charging state, the first voltage conversion device 40 converts the power transmission voltage of the off-plant power grid into the charging voltage of the energy storage device 30, the energy storage device 30 converts the electric energy into non-electric energy for storing the energy, and the corresponding charging power or power consumption power is equal to the adjusting power P.
In this embodiment, the steam turbine generator 201 is also configured to supply power to the in-plant power supply bus L, and the second voltage conversion device 50 converts the output voltage of the steam turbine generator 201 into the transmission voltage of the in-plant power supply bus L to supply power to the in-plant power load.
If the power failure occurs in the off-plant power grid and the power generation device 20, the scheduling control module 10 may control the energy storage device 30 to operate in a discharging state, and the second voltage conversion device 50 converts the output voltage of the energy storage device 30 into a transmission voltage of the in-plant power supply bus L, so as to supply power to important power utilization equipment in the reactor core waste heat discharge system of the reactor, and use the power utilization equipment as a standby power supply of the nuclear power plant.
The embodiment of the utility model provides a nuclear power plant frequency modulation control system adopts the dispatch control module to acquire the frequency modulation scheduling instruction, adjusts power generation facility's output according to the frequency modulation scheduling instruction to and according to frequency modulation scheduling instruction control energy storage or discharge of energy memory, and adjust corresponding power, adjust the frequency deviation of electric wire netting and the power deviation of junctor; generating set and energy memory still are connected through second voltage conversion equipment and the interior power supply generating line electricity of factory, to the interior load power supply of factory, system simple structure, energy storage density is high, circulated use, energy memory switching response speed is fast, has solved the problem that nuclear power plant's frequency modulation is inefficient, is favorable to improving the electric wire netting stability, promotes energy memory's availability factor, the extension service life, promotion system security and feature of environmental protection improve the electric wire netting stability, improve electric energy quality.
Optionally, the energy storage device 30 includes an electrochemical energy storage device 60 and/or an impounded water energy storage device 70.
The electrochemical energy storage device 60 can be used for realizing the mutual conversion of electric energy and chemical energy, has high energy storage density, high energy storage and discharge efficiency, high switching response speed and long service life, can be recycled, and is beneficial to improving the safety and environmental protection of the system; the water storage and energy storage device 70 can be used for realizing mutual conversion of electric energy and mechanical energy, has high energy storage and discharge efficiency, can be recycled, has high switching response speed and long service life, and is favorable for improving the system safety and the environmental protection property.
In this embodiment, the nuclear power plant may be configured with the electrochemical energy storage device 60 or the water storage energy storage device 70 separately, or with the electrochemical energy storage device 60 and the water storage energy storage device 70 simultaneously, and perform energy storage and discharge by using a plurality of energy storage devices, and set corresponding priorities, upper and lower limits of charge and discharge capacities, and the like to perform logic control on the energy storage and discharge processes.
It should be noted that the specific structures and energy storage capacities of the electrochemical energy storage device 60 and the water storage energy storage device 70 can be adjusted according to the historical frequency modulation capacity requirement of the nuclear power plant or the power demand of the service load, and of course, the energy storage device 30 can also be configured as other devices having the energy storage and power generation functions, which is not limited thereto.
Example two
Fig. 2 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to an embodiment of the present invention. In this embodiment, the nuclear power plant is configured with a water storage and energy storage device 70, and the water storage and energy storage device is used to participate in the frequency modulation of the power grid.
Optionally, the water storage and energy storage device 70 includes a water storage control unit, a water storage tank, a water pumping module and a hydroelectric power generation module, wherein an output end of the hydroelectric power generation module is electrically connected to the first voltage conversion device 40 and the second voltage conversion device 50, respectively; the power ends of the pumping module are respectively and electrically connected with the first voltage conversion device 40 and the second voltage conversion device 50; the water pumping module is connected with the reservoir through a water pumping pipeline, and the hydroelectric generation module is connected with the reservoir through a water discharging pipeline; the water storage control unit is electrically connected with the scheduling control module 10 and is used for receiving a first frequency modulation scheduling instruction output by the scheduling control module 10 and controlling the water pumping module or the hydroelectric generation module to work according to the first frequency modulation scheduling instruction; the water pumping module is used for conveying water to the reservoir to realize water storage and energy storage; the hydroelectric generation module is used for discharging water from the reservoir to realize water drainage and power generation.
The water pumping module can comprise a water pumping motor, and the hydroelectric generation module comprises a water wheel and a hydroelectric generator connected with the water wheel.
In this embodiment, the first frequency modulation scheduling instruction may be a secondary frequency modulation scheduling instruction, and the first frequency modulation scheduling instruction may be sent by the upper-stage power scheduling system, and is used to control the water storage and energy storage device 70 to participate in secondary frequency modulation of the power grid.
Specifically, in the process of using the water storage and energy storage device 70 to participate in the frequency modulation of the power grid, the first frequency modulation scheduling instruction includes power P 'required for frequency modulation of the water storage and energy storage device 70, the water storage control unit analyzes the first frequency modulation scheduling instruction according to a preset program, and judges whether the power P' required for frequency modulation of the water storage and energy storage device 70 is greater than zero, if the power P 'is greater than zero, the water storage control unit controls the water storage tank to discharge water to drive the water wheel to rotate and drive the hydroelectric generator to output electric energy, and the first voltage conversion device 40 converts the output voltage of the hydroelectric generator into the transmission voltage of the external power grid of the plant and provides the power P' for the interconnection line T; if the power P' is equal to zero, the water storage control unit controls the water storage and energy storage device 70 to stop; if the power P 'is less than zero, the dispatching control module 10 controls the first voltage conversion device 40 to convert the transmission voltage of the off-plant power grid into the rated working voltage of the water pumping motor and transmit the rated working voltage to the power supply end of the water pumping motor, the water storage control unit controls the water pumping motor to work and convey water to the water storage tank to realize water storage and energy storage, and the power consumption power of the water pumping motor is equal to the power P'.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to a third embodiment of the present invention. In this embodiment, the nuclear power plant is provided with an electrochemical energy storage device, and the electrochemical energy storage device is used to participate in frequency modulation of the power grid.
Optionally, the electrochemical energy storage device 60 includes a battery assembly 610, a bidirectional ac/dc conversion unit 620, and a charge/discharge control unit 630, the battery assembly 610 is electrically connected to the dc side of the bidirectional ac/dc conversion unit 620, and the dc side of the bidirectional ac/dc conversion unit 620 is electrically connected to the first voltage conversion device 40 and the second voltage conversion device 50, respectively; the first end of the charge and discharge control unit 630 is connected with the battery assembly 610, the second end of the charge and discharge control unit 630 is connected with the scheduling control module 10, and the charge and discharge control unit 630 is configured to receive a second frequency modulation scheduling instruction output by the scheduling control module 10, and control the battery assembly 610 to discharge to the outside through the bidirectional ac/dc conversion unit 620 according to the second frequency modulation scheduling instruction; or, the bidirectional ac-dc conversion unit 620 is controlled to charge the battery assembly 610.
In this embodiment, the second frequency modulation scheduling instruction may be a secondary frequency modulation scheduling instruction, and the second frequency modulation scheduling instruction may be sent by the upper-stage power scheduling system, and is used to control the electrochemical energy storage device 60 to participate in secondary frequency modulation of the power grid.
Specifically, in the process of using the electrochemical energy storage device 60 to participate in the frequency modulation of the power grid, the second frequency modulation scheduling instruction includes power P ″ required by the frequency modulation of the electrochemical energy storage device 60, the charge and discharge control unit 630 analyzes the second frequency modulation scheduling instruction according to a preset program, and determines whether the power P ″ required by the frequency modulation of the electrochemical energy storage device 60 is greater than zero, if the power P ″ is greater than zero, the charge and discharge control unit 630 controls the bidirectional ac/dc conversion unit 620 to operate in an inversion state, the bidirectional ac/dc conversion unit 620 converts the dc voltage of the battery assembly 610 into an ac voltage, and the first voltage conversion device 40 converts the ac voltage output by the bidirectional ac/dc conversion unit 620 into a transmission voltage of an off-plant power grid, so as to provide the power P ″ to the grid; if the power P "is equal to zero, the charge and discharge control unit 630 controls the electrochemical energy storage device 60 to stop working; if the power P "is less than zero, the dispatch control module 10 controls the first voltage conversion device 40 to convert the transmission voltage of the off-plant grid into the ac side voltage of the bidirectional ac/dc conversion unit 620, the charge/discharge control unit 630 controls the bidirectional ac/dc conversion unit 620 to operate in a rectified state, the bidirectional ac/dc conversion unit 620 converts the ac voltage of the in-plant power supply bus L into a dc voltage, the dc voltage is equal to the charging voltage of the battery pack 610, and the dc voltage is transmitted to the battery pack 610 to charge the battery pack 610, and the charging power of the battery pack 610 is equal to the power P".
Optionally, as shown in fig. 3, the nuclear power plant frequency modulation control system 01 further includes a battery management unit 640, a first end of the battery management unit 640 is connected to the battery assembly 610, a second end of the battery management unit 640 is connected to the scheduling control module 10, and the battery management unit 640 is configured to detect a voltage, a temperature, and a remaining power of the battery assembly 610, and send a detection result to the scheduling control module 10; the scheduling control module 10 is further configured to control the electrochemical energy storage device 60 to charge or discharge according to the remaining power and the second frequency modulation scheduling instruction, and adjust the charging and discharging power.
In this embodiment, the battery management unit 640 collects the voltage of a single-core cell of the battery assembly 610, the cell temperature, and the remaining power of the battery assembly 610, and sends the voltage of the single-core cell and the cell temperature to the scheduling control module 10, and the scheduling control module 10 performs balance control on the battery assembly 610 according to the voltage of the single-core cell; when the cell temperature is greater than the preset temperature threshold, the scheduling control module 10 controls the electrochemical energy storage device 60 to stop working; when the remaining capacity of the battery assembly 610 is lower than the preset capacity threshold, the scheduling control module 10 controls the electrochemical energy storage device 610 to stop working, so as to prevent the battery assembly 610 from over-discharging and prolong the service life of the battery assembly 610.
In this embodiment, the scheduling control module 10 is further configured to calculate a maximum discharging power or a maximum charging power of the battery assembly 610 according to the remaining capacity, and if the power P "required for frequency modulation of the electrochemical energy storage device 60 is greater than the maximum discharging power or the maximum charging power, control the battery assembly 610 to stop charging and discharging operations when the charging and discharging power of the battery assembly 610 reaches the power P".
Optionally, the bidirectional AC/DC conversion unit 620 includes an isolation circuit, a bidirectional DC/DC circuit, and a bidirectional DC/AC circuit, a first end of the isolation circuit is connected to the battery assembly 610, and a second end of the isolation circuit is connected to a first end of the bidirectional DC/DC circuit; the DC end of the bi-directional DC/AC circuit is connected to the second end of the bi-directional DC/DC circuit, and the AC end of the bi-directional DC/AC circuit is electrically connected to the first voltage converting device 40 and the second voltage converting device 50, respectively.
In this embodiment, the isolation circuit may be a resonant filter circuit, and the isolation circuit is configured to filter the output voltage of the battery assembly and transmit the filtered DC voltage to the bidirectional DC/DC circuit.
In the embodiment, the bidirectional DC/DC circuit may adopt a bidirectional Buck-Boost topology, and the bidirectional DC/AC circuit may adopt a three-phase full-bridge topology.
Exemplarily, assuming that the voltage value of the output voltage of the battery assembly 610 is higher than the voltage value of the rated voltage of the in-plant power supply bus L, if the battery assembly 610 supplies power to the in-plant power supply bus L through the bidirectional AC/DC conversion unit 620, the scheduling control module 10 controls the bidirectional DC/DC circuit to operate in the step-down mode and transmits the voltage after the step-down processing to the bidirectional DC/AC circuit, the control module 10 controls the bidirectional DC/AC circuit to perform the inversion processing on the voltage after the step-down processing, and the bidirectional DC/AC circuit transmits an AC voltage to the in-plant power supply bus L, where the AC voltage is equal to the transmission voltage of the in-plant power supply bus L; if the power supply bus L in the plant supplies power to the battery assembly 610 through the bidirectional AC/DC conversion unit 620, the bidirectional DC/AC circuit of the control module 10 rectifies the power supply voltage of the power supply bus L in the plant, outputs a direct current voltage, and the control module 10 controls the bidirectional DC/DC circuit to operate in a boost mode, and transmits the boosted voltage to the battery assembly 610, thereby realizing bidirectional flow of electric energy.
Optionally, battery assembly 610 includes any of a lead-acid battery, a lithium ion battery, a flow battery, a sodium sulfur battery, or a nickel-based battery.
In this embodiment, the energy storage capacity of the battery assembly 610 is set according to the historical frequency modulation capacity requirement of the nuclear power plant or the power demand of the service load, and since different types of battery discharge platforms and charging performances are different, a plurality of battery packs of the same type can be selected for parallel use, for example, the battery assembly 610 can adopt a plurality of lead-acid battery packs for parallel connection, the energy storage capacity of the battery assembly 610 is enlarged, the energy storage density is improved, and the load carrying capacity is improved.
Of course, the battery assembly 610 may also employ other electrochemical energy storage devices, without limitation.
Example four
Fig. 4 is a schematic structural diagram of a nuclear power plant frequency modulation control system according to a fourth embodiment of the present invention. The embodiment is applicable to an application scenario in which a combination of the battery assembly 610 and the diesel generator is used as a standby power supply or an emergency power supply for a nuclear power plant.
Optionally, as shown in fig. 4, the nuclear power plant frequency modulation control system 01 further includes a standby generator set 202 and a generator management unit 203, wherein an output end of the standby generator set 202 is connected to the in-plant power supply bus L; the generator management unit 203 is configured to detect a rotation speed and an output voltage of the standby generator set 202, and send the rotation speed and the output voltage to the scheduling control module 10; the dispatching control module 10 is further configured to receive a power failure fault signal, and when the power failure fault signal is received, the dispatching control module 10 controls the energy storage device 30 to supply power to the in-plant power supply bus L, and controls the standby generator set 202 to start up, and controls the energy storage device 30 to stop supplying power when the rotation speed reaches a preset rotation speed and the output voltage reaches a preset voltage.
In this embodiment, the backup generator set 202 may be a diesel backup generator set, and the generated power is provided to the in-plant power supply bus L as a backup power source. If the dispatch control module 10 is further configured to receive a power failure fault signal, the dispatch control module 10 controls the battery assembly 610 to supply power to the in-plant power supply bus L through the bidirectional ac/dc conversion unit 620, and simultaneously controls the standby generator set 202 to start, and the generator management unit 203 detects the rotation speed and the output voltage of the standby generator set 202 in real time and sends the rotation speed and the output voltage to the dispatch control module 10. The dispatching control module 10 receives the real-time rotating speed of the standby generator set 202 and the real-time output voltage of the standby generator set 202, the rotating speed is compared with a preset rotating speed, the output voltage is compared with a preset voltage, if the rotating speed reaches the preset rotating speed and the output voltage reaches the preset voltage, the dispatching control module 10 judges that the standby generator set 202 is started up and completed, and the on-load running state is achieved, the dispatching control module 10 controls the electric energy output end of the standby generator set 202 to be connected into the in-plant power supply bus L, and controls the battery assembly 610 to stop supplying power to the in-plant power supply bus L, the standby generator set 202 is connected into the in-plant power supply bus L, and power is supplied to an electric load connected to the in.
In this embodiment, the nuclear power plant frequency modulation control system 01 is provided with a standby generator set 202 and an energy storage device 30, when a power failure fault occurs, the scheduling control module 10 controls the energy storage device 30 to access a power supply bus L in a plant to supply power to an electric load connected to the power supply bus L in the plant, the switching response speed is high, and meanwhile, the standby generator set 202 is controlled to start; after the standby generator set 202 is started, the control module 10 controls the standby generator set 202 to be connected to the in-plant power supply bus L to supply power to the power load connected to the in-plant power supply bus L, so that the capacity insufficiency caused by long-term on-load operation of the battery assembly 610 is avoided; the problem of diesel generator start time long is solved, the deep defense ability of nuclear power plant is improved, be favorable to promoting stand-by power supply availability factor simultaneously.
Optionally, the nuclear power plant frequency modulation control system 01 further includes an alarm unit, the alarm unit is connected to the dispatch control module 10, and the alarm unit is configured to send out first alarm information when the electrochemical energy storage device 60 is powered and send out second alarm information when the standby generator set 202 is powered.
Illustratively, the alarm unit includes a voice prompt unit and an audible and visual alarm, and if the dispatch control module 10 controls the electrochemical energy storage device 60 to access the power supply bus L in the plant, the dispatch control module 10 controls the alarm unit to send out first alarm information, for example, the first alarm information includes a voice prompt "the energy storage device supplies power", the audible and visual alarm sends out a buzzer sound of a first frequency, and lights up a first indicator light; if the dispatch control module 10 controls the backup generator set 202 to access the in-plant power supply bus L, the dispatch control module 10 controls the alarm unit to send out the second alarm information, for example, the second alarm information includes a voice prompt "backup generator set supplies power", the audible and visual alarm sends out a beep of the second frequency, and lights up the second indicator light, wherein the first indicator light and the second indicator light are different in color and/or flashing frequency, and the display is intuitive.
Optionally, the nuclear power plant frequency modulation control system 01 further includes a communication unit, and the communication unit is configured to establish a communication connection between the scheduling control module 10 and a display terminal, and send the working state of the energy storage device 30 and/or the power generation device 20 to the display terminal for displaying.
Illustratively, the display terminal can be one or more of a display screen provided with a control room or a dispatching center, a computer or a smart phone. When the nuclear power plant frequency modulation control system 01 is put into use, the communication unit establishes communication connection between the scheduling control module 10 and the display terminal, the scheduling control module 10 can receive a frequency modulation scheduling instruction through the communication unit, the scheduling control module 10 is further used for acquiring the voltage, the temperature and the residual electric quantity of the battery assembly 610 in real time and transmitting the voltage, the temperature and the residual electric quantity of the battery assembly 610 to the display terminal for displaying through a wireless communication network; the scheduling control module 10 is further configured to obtain the rotation speed, the output voltage, and the output power of the power generation device 20 in real time, and send the rotation speed, the output voltage, and the output power of the power generation device 20 to a display terminal through a wireless communication network for displaying, so as to remotely monitor the operating state of the nuclear power plant frequency modulation control system 01.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (8)

1. A nuclear power plant frequency modulation control system, comprising: the system comprises a scheduling control module, a power generation device, an energy storage device, a first voltage conversion device and a second voltage conversion device, wherein the energy storage device is used for realizing energy storage or discharge;
the power generation device and the energy storage device are electrically connected with a tie line through the first voltage conversion device respectively;
the power generation device and the energy storage device are electrically connected with a power supply bus in a plant through the second voltage conversion device respectively;
the scheduling control module is used for acquiring a frequency modulation scheduling instruction, adjusting the output power of the power generation device according to the frequency modulation scheduling instruction, controlling the energy storage device to store or discharge energy according to the frequency modulation scheduling instruction, and adjusting the corresponding power.
2. A nuclear plant fm control system according to claim 1, wherein the energy storage device comprises an electrochemical energy storage device and/or an impounded water energy storage device.
3. The nuclear power plant frequency modulation control system of claim 2, wherein the water storage and energy storage device comprises a water storage control unit, a water storage tank, a water pumping module and a hydroelectric generation module, wherein an output end of the hydroelectric generation module is electrically connected with the first voltage conversion device and the second voltage conversion device respectively;
the water pumping module is connected with the reservoir through a water pumping pipeline, and the hydroelectric generation module is connected with the reservoir through a water discharging pipeline;
the water storage control unit is electrically connected with the scheduling control module and is used for receiving a first frequency modulation scheduling instruction output by the scheduling control module and controlling the water pumping module or the hydroelectric generation module to work according to the first frequency modulation scheduling instruction;
the water pumping module is used for conveying water to the reservoir to realize water storage and energy storage;
the hydroelectric generation module is used for discharging water from the reservoir to realize water drainage and power generation.
4. The nuclear power plant frequency modulation control system of claim 2, wherein the electrochemical energy storage device comprises a battery assembly, a bidirectional ac/dc conversion unit, and a charge/discharge control unit, the battery assembly is electrically connected to a dc side of the bidirectional ac/dc conversion unit, and the dc side of the bidirectional ac/dc conversion unit is electrically connected to the first voltage conversion device and the second voltage conversion device, respectively;
the first end of the charge and discharge control unit is connected with the battery assembly, the second end of the charge and discharge control unit is connected with the scheduling control module, and the charge and discharge control unit is used for receiving a second frequency modulation scheduling instruction output by the scheduling control module and controlling the battery assembly to discharge outwards through the bidirectional alternating current-direct current conversion unit according to the second frequency modulation scheduling instruction; or, the bidirectional alternating current-direct current conversion unit is controlled to charge the battery pack.
5. The nuclear power plant frequency modulation control system according to claim 4, further comprising a battery management unit, wherein a first end of the battery management unit is connected to the battery assembly, a second end of the battery management unit is connected to the scheduling control module, and the battery management unit is configured to detect a voltage, a temperature, and a remaining power of the battery assembly and send a detection result to the scheduling control module;
the dispatching control module is further used for controlling the electrochemical energy storage device to charge or discharge according to the residual electric quantity and the second frequency modulation dispatching instruction, and adjusting charging and discharging power.
6. The nuclear power plant frequency modulation control system of claim 4, wherein the bidirectional AC to DC conversion unit comprises an isolation circuit, a bidirectional DC/DC circuit, and a bidirectional DC/AC circuit, a first end of the isolation circuit being connected to the battery assembly, a second end of the isolation circuit being connected to a first end of the bidirectional DC/DC circuit; the direct current end of the bidirectional DC/AC circuit is connected with the second end of the bidirectional DC/DC circuit, and the alternating current end of the bidirectional DC/AC circuit is electrically connected with the first voltage conversion device and the second voltage conversion device respectively.
7. The nuclear plant frequency modulation control system of claim 4, wherein the battery assembly comprises any one of a lead-acid battery, a lithium-ion battery, a flow battery, a sodium-sulfur battery, or a nickel-based battery.
8. A nuclear power plant frequency modulation control system according to any one of claims 1-7, further comprising a backup generator set and a generator management unit, wherein,
the output end of the standby generator set is connected with a power supply bus in a plant;
the generator management unit is used for detecting the rotating speed and the output voltage of the standby generator set and sending the rotating speed and the output voltage to the dispatching control module;
the dispatching control module is also used for receiving a power failure fault signal, controlling the energy storage device to supply power to the power supply bus in the plant, controlling the standby generator set to start, and controlling the energy storage device to stop supplying power when the rotating speed reaches a preset rotating speed and the output voltage reaches a preset voltage.
CN202022173897.1U 2020-09-27 2020-09-27 Nuclear power plant frequency modulation control system Active CN212343342U (en)

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