Depth defense operation management method suitable for industrial micro-grid stability control

Abstract

The invention provides a depth defense operation management method suitable for industrial micro-grid stability control, and relates to the technical field of micro-grids. The method comprises the following steps: obtaining the operation state of an industrial micro-grid comprising energy storage equipment, industrial load, photovoltaic power generation equipment, photo-thermal power generation equipment and fuel power generation equipment; when it is determined that the operation state of the industrial micro-grid is isolated grid operation, control strategies for power generation equipment, electric equipment, energy storage equipment and the like in the industrial micro-grid are configured from the active and reactive aspects respectively based on the frequency fluctuation condition and the voltage disturbance condition of the industrial micro-grid, so that voltage and frequency fluctuation protection is achieved; and the operation stability of the industrial micro-grid can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of microgrids, and in particular to a defense-in-depth operation management method suitable for stable control of industrial microgrids. Background Art

[0002] Asynchronous motors, high-temperature electrolysis equipment, arc furnaces and other equipment used in large-scale industrial production, as well as processes with strict production schedules, have high requirements for the reliability of the power supply system. If there are power outages, power equipment failures, large frequency fluctuations and other events during the production process, if there is no effective response, it will have a significant impact on industrial production.

[0003] In some areas where power resources are insufficient, there are widespread problems such as weak external power grids, frequent large disturbances such as switching between grids and off-grid, and normalized isolated grid operation. The traditional power grid's stable control mode, which mainly relies on cutting generators and loads, cannot achieve safe and stable operation of factory power grids, and it is difficult to meet the high-reliability power demand of industrial production. Summary of the invention

[0004] The present invention provides a defense-in-depth operation management method suitable for stable control of industrial microgrids, which is used to solve the defect in the prior art that areas with insufficient power resources cannot ensure the safe and stable operation of factory power grids, and improve the stability of factory power grid operation.

[0005] The present invention provides a defense-in-depth operation management method applicable to stable control of an industrial microgrid, the method comprising: Obtaining the operating status of an industrial microgrid, wherein the industrial microgrid includes power supply points, energy storage equipment, and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment, and fuel power generation equipment; When it is determined that the operating state of the industrial microgrid is isolated grid operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform a primary frequency modulation, the frequency signal and a first active power control instruction are sent to the energy storage device in the industrial microgrid to perform a primary frequency modulation, and the charge state of the energy storage device is managed, a second active power control instruction is sent to the power source point to perform a secondary frequency modulation, and a start permission signal is sent to the load device based on the operating state of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, the energy storage equipment and the fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive control instruction is sent to the reactive power compensation device to provide reactive compensation.

[0006] According to a defense-in-depth operation management method applicable to stable control of an industrial microgrid provided by the present invention, after determining that the operation state of the industrial microgrid is isolated grid operation, the method comprises: Controlling the photovoltaic power generation equipment to operate in a constant power factor mode; When it is determined that the frequency of the industrial microgrid is stable, the output of the solar thermal power generation equipment is controlled and dispatched based on the power forecast and production plan of the photovoltaic power generation equipment, and the climbing speed of the photovoltaic power generation equipment is limited.

[0007] According to a defense-in-depth operation management method applicable to stable control of an industrial microgrid provided by the present invention, after obtaining the operation status of the industrial microgrid, the method includes: When it is determined that the frequency drop amplitude of the industrial microgrid is greater than a first preset amplitude, the high-voltage inverter is controlled to operate at reduced output, and a closing instruction is sent to a part of the load switch to cut off the corresponding load; When it is determined that the voltage drop of the industrial microgrid is greater than a second preset amplitude, the photovoltaic power generation equipment and the fuel power generation equipment are controlled to cut load, and a closing instruction is sent to part of the load switches to cut off the corresponding load.

[0008] According to a defense-in-depth operation management method applicable to stable control of an industrial microgrid provided by the present invention, after obtaining the operation status of the industrial microgrid, the method includes: When it is determined that the industrial microgrid has a frequency collapse or a voltage collapse, the energy storage device and the fuel power generation device are controlled to be disconnected.

[0009] According to a defense-in-depth operation management method applicable to stable control of an industrial microgrid provided by the present invention, after obtaining the operation status of the industrial microgrid, the method includes: When it is determined that the industrial microgrid is completely dark, the energy storage device and the fuel power generation device are controlled to be zero-loaded. After the energy storage device and the fuel power generation device are zero-loaded, the photovoltaic power generation device and the load are controlled to be incorporated into the industrial microgrid.

[0010] According to a defense-in-depth operation management method applicable to stable control of an industrial microgrid provided by the present invention, after obtaining the operation status of the industrial microgrid, the method includes: When it is determined that there is a device fault in the industrial microgrid, controlling the operation of the device in the industrial microgrid based on the type of the fault; When the fault type is a power supply side equipment fault, reducing the load and increasing the output of the remaining power of the photovoltaic power generation equipment and the energy storage equipment; When the fault type is a load-side equipment fault, the photovoltaic power generation equipment is controlled to reduce power generation output.

[0011] The present invention also provides a defense-in-depth operation management device suitable for stable control of industrial microgrids, the device comprising: A grid status acquisition module, used to acquire the operating status of an industrial microgrid, wherein the industrial microgrid includes power supply points, energy storage equipment, and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment, and fuel power generation equipment; The control strategy execution module is used for, when it is determined that the operating state of the industrial microgrid is isolated grid operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform a primary frequency modulation, the frequency signal and a first active power control instruction are sent to the energy storage device in the industrial microgrid to perform a primary frequency modulation, and the charge state of the energy storage device is managed, a second active power control instruction is sent to the power source point to perform a secondary frequency modulation, and a start permission signal is sent to the load device based on the operating state of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, the energy storage equipment and the fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive control instruction is sent to the reactive power compensation device to provide reactive compensation.

[0012] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, an in-depth defense operation management method applicable to stable control of an industrial microgrid as described in any one of the above-mentioned methods is implemented.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the in-depth defense operation management method applicable to stable control of an industrial microgrid as described in any one of the above-mentioned methods is implemented.

[0014] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-described in-depth defense operation management methods applicable to stable control of industrial microgrids.

[0015] The in-depth defense operation management method suitable for stable control of industrial microgrids provided by the present invention obtains the operating status of industrial microgrids including energy storage equipment, industrial loads, photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment, and when determining that the operating status of the industrial microgrid is isolated grid operation, based on the frequency fluctuation and voltage disturbance of the industrial microgrid, control strategies for power generation equipment, power consumption equipment, energy storage equipment, etc. in the industrial microgrid are configured from the active and reactive aspects, so as to realize voltage and frequency fluctuation protection, which can effectively improve the stability of industrial microgrid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a flow chart of the in-depth defense operation management method applicable to stable control of industrial microgrids provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of a defense-in-depth operation management device suitable for stable control of an industrial microgrid provided by the present invention.

[0019] Figure 3 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figure 1 The present invention describes a defense-in-depth operation management method applicable to stable control of industrial microgrids. Figure 1 As shown, the in-depth defense operation management method applicable to stable control of industrial microgrids provided by the present invention comprises the following steps: S110, obtaining the operating status of the industrial microgrid, where the industrial microgrid includes power supply points, energy storage equipment, and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment, and fuel power generation equipment; S120. When it is determined that the operation state of the industrial microgrid is isolated operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform primary frequency modulation, a frequency signal and a first active power control instruction are sent to the energy storage equipment in the industrial microgrid to perform primary frequency modulation, and the charge state of the energy storage equipment is managed, a second active power control instruction is sent to the power source point to perform secondary frequency modulation, and a start permission signal is sent to the load equipment based on the operating status of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, energy storage equipment and fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive power control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive power control instruction is sent to the reactive power compensation device to provide reactive compensation.

[0022] The method provided by the present invention obtains the operating status of an industrial microgrid including energy storage equipment, industrial loads, photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment, and when determining that the operating status of the industrial microgrid is isolated grid operation, based on the frequency fluctuation and voltage disturbance of the industrial microgrid, respectively configures control strategies for power generation equipment, power consumption equipment, energy storage equipment, etc. in the industrial microgrid from the two aspects of active and reactive power to achieve voltage and frequency fluctuation protection, which can effectively improve the stability of the operation of the industrial microgrid.

[0023] The industrial microgrid in the method provided by the present invention is a source-grid-load-storage power system, and the method provided by the present invention can be executed by the power generation control master station in the industrial microgrid. The method provided by the present invention formulates control actions that go deep into different equipment for different working conditions of the industrial microgrid from the two perspectives of active power and reactive power, so as to achieve the defensive operation of the industrial microgrid and improve the operating stability of the industrial microgrid. At some control strategy points, active depth control and reactive depth control have the same control purpose. At other points, control strategies are developed for the frequency and voltage characteristics of active power and reactive power themselves. The two are coupled with each other and complement each other, forming a depth defense strategy for industrial power microgrids.

[0024] The method provided by the present invention, in the active defense-in-depth mechanism, for typical fault types under different operating modes, ensures the stability of the power grid frequency through the coordination of frequency control-stabilization strategy-distributed frequency protection-active decoupling-safe shutdown and rapid restart multiple mechanisms. It includes the microgrid frequency control mechanism for load management and coordinated joint control of the park microgrid; the stable control mechanism for the generator power supply, microgrid body, actual power load, energy storage and other equipment and systems in the microgrid under fault conditions; the distributed frequency protection mechanism for realizing stable frequency recovery in the industrial power microgrid; the active decoupling mechanism of the power supply system to ensure the safe and stable operation of the self-contained generator set and energy storage system in the industrial plant area, and the safe start-stop and rapid restart mechanism for realizing the safe start of the power generation equipment and each sub-system in the plant area microgrid.

[0025] The method provided by the present invention mainly coordinates the reactive output of each power source point in the reactive defense-in-depth mechanism by adjusting the reactive power, power factor and other operating parameters of each power source and load equipment in the system for different fault types under different operating modes of the industrial production microgrid, ensuring that the system maintains the grid voltage stability and the voltage of each busbar is within the qualified range under various disturbances. It includes a voltage small disturbance control mechanism for performing reactive output dispatching in the factory microgrid and realizing fast and stable voltage regulation; a fault state stabilization control mechanism for regulating each power-consuming equipment and power grid in the microgrid under fault conditions; a distributed over- and under-voltage protection mechanism for preventing the collapse of the microgrid power system and realizing voltage stabilization control; a power supply system active decoupling mechanism to ensure the safe operation of power generation and energy storage equipment in the factory microgrid, and a safe shutdown and fast restart mechanism for realizing safe shutdown and fast black start of the system.

[0026] Specifically, in the active defense-in-depth mechanism, if the industrial microgrid is in isolated operation, that is, when the external power grid to which the industrial microgrid is connected is powered off, the regulation capabilities of each power source in the industrial microgrid are fully utilized, and reasonable coordination and management are carried out with the load side to maintain the stability of the source-grid-load-storage frequency. Frequency control is mainly completed by the coordination of the power generation control master station and various power supply points, requiring the frequency regulation characteristics of energy storage and photovoltaics to be fast and stable.

[0027] When the industrial microgrid is in isolated operation, if the frequency has dynamic fluctuations, a real-time secondary frequency modulation instruction (i.e., the second active power control instruction) is issued according to the frequency change to adjust the output of each power source and control the frequency to be stable. Specifically, the output of the power source after secondary frequency modulation should be controlled in case of dynamic fluctuations. ;in, Indicates the output of the power point during the frequency static stability period. is the frequency adjustment coefficient, and They are the system measured frequency value and rated frequency value respectively; is the secondary frequency modulation compensation power instruction value at the power source point, It is determined by the difference between the frequency after one frequency modulation and the set system requirement frequency.

[0028] When the industrial microgrid is in isolated operation and the frequency fluctuates dynamically, a frequency signal reflecting the current frequency situation in the industrial microgrid is sent to the photovoltaic power generation equipment to perform a frequency modulation, and a frequency signal and a first active power control instruction are sent to the energy storage device to perform a frequency modulation and manage the state of charge (SOC) of the energy storage device. Photovoltaic power generation equipment helps maintain frequency stability by performing a frequency modulation. The energy storage device (which can be an electrochemical energy storage system) receives the frequency signal and performs a frequency modulation to help maintain the stability of the microgrid frequency. On the other hand, it receives the first active power control instruction to smooth the fluctuation of photovoltaic power generation power and complete its own SOC management, as shown in the following formula: ; in, Indicates the command power of the energy storage device (i.e. the power that the energy storage device needs to achieve). Target command power for photovoltaic and energy storage equipment; Generates power for photovoltaic power generation equipment.

[0029] When the industrial microgrid is in isolated operation and the frequency fluctuates dynamically, it also receives the start-up permission signal from the master station through the management and control of the start-up of large motors (motor of large power-consuming equipment), ensures the orderly start-up of large motors, and reduces the impact disturbance on the power grid. Under large frequency fluctuations, the rectifier equipment on the load side also participates in the active power-frequency droop regulation, that is, controls the active output of the rectifier equipment. ,in and They are respectively the set active output of the rectifier device (i.e. the active output that needs to be achieved by controlling the rectifier device) and the initial active output; It is the droop control coefficient of the rectifier equipment, which is a negative value.

[0030] When it is determined that the operation state of the industrial microgrid is isolated operation and there is no dynamic frequency fluctuation, the output of the solar thermal power generation equipment is dispatched based on the power forecast and production plan of the photovoltaic power generation equipment, and the ramp speed of the photovoltaic power generation equipment is limited. The power dispatch upper limit of the photothermal power generation equipment when the frequency is statically stable ,in and They are respectively the light-to-heat conversion efficiency of the heat collecting device of the CSP equipment and the heat-to-electricity conversion efficiency of the power generation system of the CSP equipment; S is the light receiving area of ​​the mirror field of the CSP equipment.

[0031] In summary, when the industrial microgrid is operating in an isolated grid, during the frequency control process, active power instructions are sent to the fuel generator to complete the secondary frequency modulation and maintain frequency stability; signals are sent to the photovoltaic fast power regulation to perform primary frequency modulation; signals and instructions are sent to the energy storage to perform primary frequency modulation, smooth photovoltaic fluctuations, and complete SOC management; start permission signals are sent to large motors to limit start-up. The action status and limited action time (if any) of each device are as follows: The photovoltaic receives the frequency signal, performs a frequency modulation, and completes the rapid power regulation; the electrochemical energy storage receives the speed signal, performs a frequency modulation, and receives the active power instruction at the same time, smoothes the photovoltaic fluctuation, and completes the SOC management; the high-voltage inverter receives the speed signal and performs a frequency modulation; the other equipment operates normally under this working condition. The time limit for the first frequency modulation action is 20ms, and the time limit for the second frequency modulation action is 50ms.

[0032] In the reactive defense-in-depth mechanism, if the industrial microgrid is in isolated operation, the regulation capacity of each power source point is fully utilized. Under the condition of normal operation of the source-grid-load-storage isolated network, the reactive output is reasonably dispatched, and the Q (reactive power)-V (voltage) droop control function of each device in the system is used for voltage regulation. The voltage of the system is kept at a stable level through various means. The voltage small disturbance control is completed by the power generation control master station of the source-grid-load-storage, which requires the voltage regulation characteristics of the solar thermal unit, energy storage and photovoltaic to be fast and stable.

[0033] Specifically, when the industrial microgrid is in isolated operation and the voltage fluctuates, a real-time secondary voltage regulation instruction (i.e., the second reactive power control instruction) is issued according to the voltage change to adjust the reactive power output of each power source point and control the voltage to be stable. The process can be expressed by the formula: ; in, Indicates the reactive power or powerlessness of the power source point (i.e. the reactive power or powerlessness that needs to be achieved by the power source point). Provide power to each power source point during the static stable period; is the voltage regulation coefficient; U and Measure the voltage value and rated voltage value for the power supply point respectively; is the secondary voltage regulation compensation power instruction value at each power supply point, Determined based on the difference between the voltage after primary regulation and the set system requirement voltage.

[0034] When the industrial microgrid operates in an isolated network, the energy storage equipment is also a power source. The power sources involved in secondary voltage regulation include solar thermal power generation equipment and energy storage equipment.

[0035] When the industrial microgrid is in isolated operation and the voltage fluctuates, the energy storage device operates in constant voltage mode to provide certain reactive power support. On the other hand, it receives the voltage signal sent by the master station to reflect the voltage condition of the industrial microgrid. Through Q (reactive power)-V (voltage) droop control, it performs a primary voltage regulation to help maintain voltage stability. The primary voltage regulation process of the energy storage system can be expressed by the formula: ;in and They are the set reactive power of the energy storage device (i.e. the reactive power required to be achieved after voltage regulation) and the initial reactive power; is the QV droop control coefficient of the energy storage system.

[0036] When the industrial microgrid is in isolated operation, the photovoltaic power generation equipment operates in constant power factor mode, providing a certain reactive power support, which can be expressed as: , It is the reactive power of photovoltaic power generation equipment; is the active power of photovoltaic power generation equipment; is the power factor of photovoltaic power generation equipment.

[0037] When the industrial microgrid is in isolated operation, reactive power compensation devices such as SVG / phase regulator provide reactive power compensation for the industrial microgrid to improve grid voltage stability. That is, the control master station will send a third reactive power control command to the reactive power compensation device to provide reactive power compensation.

[0038] In summary, when the industrial microgrid is operating in an isolated grid, during the voltage control process, reactive power instructions are sent to the solar thermal unit, transformer tap, and energy storage, and the voltage is given to complete the secondary voltage regulation to maintain the voltage. Photovoltaic fast power QV droop control, perform a voltage regulation. Energy storage, diesel QV droop, perform a voltage regulation. The action status of each device and the limited action time (if any) are as follows: Photovoltaic performs fast reactive power-voltage droop control; electrochemical energy storage receives reactive power and voltage instructions, completes secondary voltage regulation, maintains qualified voltage, realizes reactive power-voltage droop or constant voltage, and performs primary voltage regulation; SVG / phase regulator performs reactive power-voltage droop control, provides reactive power output, receives master station signals, and adjusts reactive power output; high-voltage inverter performs constant power factor control; diesel generator performs primary voltage regulation for reactive power-voltage droop; other equipment operates normally under this working condition. The primary voltage regulation action time limit is 20ms, and the secondary voltage regulation action time limit is 50ms.

[0039] After obtaining the operating status of the industrial microgrid, including: When it is determined that there is a device fault in the industrial microgrid, the operation of the device in the industrial microgrid is controlled based on the type of the fault; When the fault type is a power supply side equipment fault, the load is reduced and the output of the remaining power of the photovoltaic power generation equipment and energy storage equipment is increased; When the fault type is a load-side equipment fault, the photovoltaic power generation equipment is controlled to reduce the power generation output.

[0040] In industrial microgrids, the integrated source-grid-load-storage dispatching and control system is used to detect the operating status of the power grid in real time, quickly determine the type of fault, and issue corresponding power or load adjustment instructions. Faults are mainly divided into two categories: power side faults and load side faults. When a power side fault occurs, the load is reduced and the output of the remaining power of photovoltaic and energy storage is increased through fast-voltage rectifier loads, high-voltage inverters, and switches: When a load side fault occurs, the photovoltaic system receives the fast-voltage output instruction from the master station to quickly reduce the photovoltaic power generation output. In both the active defense-in-depth mechanism and the reactive defense-in-depth mechanism, the fault is determined and the corresponding power and load instructions are issued. Specifically, the actions performed by each device in the industrial microgrid are as follows: Photovoltaic receives instructions to reduce output; electrochemical energy storage receives instruction signals to perform charging or discharging operations; high-voltage inverter receives instructions to reduce load; rectifier load receives instructions to quickly reduce load; load switch receives instructions to cut off corresponding load; photovoltaic receives instructions to adjust reactive power; other equipment operates normally under this working condition. Other equipment operates normally under this working condition. The stable control action time limit is 50ms.

[0041] The method provided by the present invention provides a distributed frequency protection mechanism and a distributed voltage protection mechanism. When it is determined that the frequency drop of the industrial microgrid is greater than a first preset range, the high-voltage inverter is controlled to operate at a reduced output, and a shutdown command is sent to a partial load switch to cut off the corresponding load; when it is determined that the voltage drop of the industrial microgrid is greater than a second preset range, the photovoltaic power generation equipment and the fuel power generation equipment are controlled to cut the load, and a shutdown command is sent to a partial load switch to cut off the corresponding load.

[0042] Specifically, through the distributed frequency protection mechanism, when the frequency drops significantly, some loads are controlled to reduce power, and the balance between power generation and power consumption is restored, so that the frequency returns to stability. Distributed frequency protection is completed in a special control substation, and its action parameters should be coordinated with the stabilization strategy, mainly relying on high-voltage inverters and line disconnection on the load side. The actions performed by each device in the microgrid include: the high-voltage inverter receives instructions and operates at reduced output; the load switch receives instructions and cuts off the corresponding load; the remaining equipment operates normally under this condition. The frequency protection action time limit is 150ms, including a 100ms delay time.

[0043] Through the distributed voltage protection mechanism, when the voltage deviation of the factory microgrid power system exceeds a certain range, in order to avoid voltage collapse, some loads are actively removed to restore the system voltage to a normal range. The actions performed by various devices in the power grid include: photovoltaic as a special control terminal, performing load shedding operations; load switches receiving instructions, cutting loads to reduce output or disconnecting from the grid; diesel generators perform undervoltage load shedding; and other equipment operates normally under this condition.

[0044] When it is determined that the industrial microgrid has a frequency collapse or a voltage collapse, the energy storage device and the fuel power generation device are controlled to be disconnected.

[0045] Specifically, when there is an extreme condition of frequency collapse such as a bus failure with a small probability, all downstream loads are shed, the energy storage is not disconnected, and the load is shed to operate with the main grid (to avoid subsequent empty charging and zero charging). When the system frequency exceeds a certain range, in order to avoid a power outage in the entire plant and protect the electrochemical energy storage at the same time, the energy storage system is disconnected at a low frequency to ensure its own and industrial production security electricity, and to ensure the security of energy storage and the main transformer and bus voltage of the entire network. The actions performed by various devices in the power grid include: the high-voltage inverter receives instructions and operates at a reduced output; the load switch receives instructions and cuts off the corresponding load; the remaining equipment operates normally under this condition. The frequency protection action time limit is 150ms, of which there is a 100ms delay time.

[0046] In the event of voltage collapse, the energy storage and diesel generator systems are disconnected from the grid for overvoltage and undervoltage, and are disconnected from the grid for self-protection, avoiding power outages in the entire plant and ensuring safe power consumption of energy storage and voltage on the main transformers and busbars of the entire grid. The actions performed by various devices in the power grid include: disconnecting the electrochemical energy storage from the grid to ensure its own safe operation; disconnecting the diesel generator from the grid to ensure its own safe operation; and the remaining equipment operates normally under this condition.

[0047] Furthermore, when it is determined that the industrial microgrid is completely dark, the energy storage device and the fuel power generation device are controlled to zero, and after the energy storage device and the fuel power generation device are zero-loaded, the photovoltaic power generation device and the load are controlled to be incorporated into the industrial microgrid.

[0048] When the factory power system and microgrid are completely dark, on the one hand, the energy storage controls the DC backup power supply and UPS power supply to maintain the operation of the main security equipment and achieve safe shutdown of the entire factory; on the other hand, the energy storage equipment and fuel power generation equipment are responsible for executing black start, specifically through the cooperation of the energy storage system and the diesel generation system to perform zero ramp-up. After the zero ramp-up is completed, the photovoltaic power generation and load are connected to the grid.

[0049] The method provided by the present invention reasonably customizes voltage and frequency fluctuation protection strategies for each power generation equipment, power consumption equipment, energy storage equipment and the power grid itself in the power system to achieve safe and efficient operation of the industrial microgrid. During the design process, the operating characteristics of various types of equipment are comprehensively considered, especially for microgrids, diesel generators and energy storage equipment. The method provided by the present invention can go deep into the various types of equipment in the industrial microgrid and their action methods when facing different faults, rather than proposing a more general control concept or general strategy.

[0050] The following is a description of the in-depth defense operation management device for stable control of industrial microgrids provided by the present invention. The in-depth defense operation management device for stable control of industrial microgrids described below and the in-depth defense operation management method for stable control of industrial microgrids described above can be referred to each other. Figure 2 As shown, the in-depth defense operation management device suitable for stable control of industrial microgrids provided by the present invention includes the following modules: The grid status acquisition module 210 is used to acquire the operating status of the industrial microgrid, where the industrial microgrid includes power supply points, energy storage equipment and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment; The control strategy execution module 220 is used to, when it is determined that the operation state of the industrial microgrid is isolated operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform primary frequency modulation, a frequency signal and a first active power control instruction are sent to the energy storage equipment in the industrial microgrid to perform primary frequency modulation, and the charge state of the energy storage equipment is managed, a second active power control instruction is sent to the power source point to perform secondary frequency modulation, and a start permission signal is sent to the load equipment based on the operating status of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, energy storage equipment and fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive power control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive power control instruction is sent to the reactive power compensation device to provide reactive compensation.

[0051] Figure 3 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 3As shown, the electronic device may include: a processor 310, a communications interface 320, a memory 330 and a communication bus 340, wherein the processor 310, the communications interface 320 and the memory 330 communicate with each other through the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to execute a defense-in-depth operation management method suitable for stable control of an industrial microgrid, the method comprising: obtaining the operating state of the industrial microgrid, the industrial microgrid being a source-grid-load-storage power system, the power supply points in the industrial microgrid including photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment; when it is determined that the operating state of the industrial microgrid is isolated grid operation: based on the frequency fluctuation of the industrial microgrid, sending a frequency signal to the photovoltaic power generation equipment for power regulation to perform a frequency modulation, sending a frequency signal and a first active power control instruction to the industrial microgrid The energy storage equipment in the power grid performs primary frequency modulation and charge state management of the energy storage equipment, sends a second active power control instruction to the power source point to perform secondary frequency modulation, and sends a start permission signal to the load equipment based on the operating status of the industrial microgrid; according to the voltage disturbance of the industrial microgrid, sends a voltage signal to the photovoltaic power generation equipment, energy storage equipment and fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, sends a second reactive power control instruction to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and sends a third reactive power control instruction to the reactive power compensation device to provide reactive compensation.

[0052] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0053] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the in-depth defense operation management method suitable for stable control of industrial microgrids provided by the above methods. The method includes: obtaining the operating status of the industrial microgrid, the industrial microgrid is a source-grid-load-storage power system, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment; when it is determined that the operating status of the industrial microgrid is isolated grid operation: based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for Perform power regulation to perform primary frequency modulation, send frequency signals and the first active power control instruction to the energy storage device in the industrial microgrid to perform primary frequency modulation, and manage the charge state of the energy storage device, send the second active power control instruction to the power source point to perform secondary frequency modulation, and send a start permission signal to the load device based on the operating status of the industrial microgrid; according to the voltage disturbance of the industrial microgrid, send voltage signals to photovoltaic power generation equipment, energy storage equipment and fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, send the second reactive power control instruction to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and send the third reactive power control instruction to the reactive power compensation device to provide reactive compensation.

[0054] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the in-depth defense operation management method suitable for stable control of an industrial microgrid provided by the above-mentioned methods, the method comprising: obtaining the operating state of the industrial microgrid, the industrial microgrid being a source-grid-load-storage power system, the power supply points in the industrial microgrid comprising photovoltaic power generation equipment, solar thermal power generation equipment and fuel power generation equipment; when it is determined that the operating state of the industrial microgrid is isolated grid operation: based on the frequency fluctuation of the industrial microgrid, sending a frequency signal to the photovoltaic power generation equipment for power regulation to perform a primary frequency modulation, generating Send frequency signals and the first active power control instruction to the energy storage device in the industrial microgrid to perform primary frequency modulation and charge state management of the energy storage device, send the second active power control instruction to the power source point to perform secondary frequency modulation, and send a start permission signal to the load device based on the operating status of the industrial microgrid; according to the voltage disturbance of the industrial microgrid, send voltage signals to the photovoltaic power generation equipment, energy storage equipment and fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, send the second reactive power control instruction to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and send the third reactive power control instruction to the reactive power compensation device to provide reactive compensation.

[0055] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0056] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defense-in-depth operation management method suitable for stable control of industrial microgrids, characterized in that: The method comprises: Obtaining the operating status of an industrial microgrid, wherein the industrial microgrid includes power supply points, energy storage equipment, and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment, and fuel power generation equipment; When it is determined that the operating state of the industrial microgrid is isolated grid operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform a primary frequency modulation, the frequency signal and a first active power control instruction are sent to the energy storage device in the industrial microgrid to perform a primary frequency modulation, and the charge state of the energy storage device is managed, a second active power control instruction is sent to the power source point to perform a secondary frequency modulation, and a start permission signal is sent to the load device based on the operating state of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, the energy storage equipment and the fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive control instruction is sent to the reactive power compensation device to provide reactive compensation.

2. The in-depth defense operation management method applicable to stable control of industrial microgrids according to claim 1 is characterized in that: After determining that the operating state of the industrial microgrid is isolated grid operation, the method further comprises: Controlling the photovoltaic power generation equipment to operate in a constant power factor mode; When it is determined that the frequency of the industrial microgrid is stable, the output of the solar thermal power generation equipment is controlled and dispatched based on the power forecast and production plan of the photovoltaic power generation equipment, and the climbing speed of the photovoltaic power generation equipment is limited.

3. The in-depth defense operation management method applicable to stable control of industrial microgrids according to claim 1 is characterized in that: After obtaining the operating status of the industrial microgrid, the following steps are included: When it is determined that the frequency drop amplitude of the industrial microgrid is greater than a first preset amplitude, the high-voltage inverter is controlled to operate at reduced output, and a closing instruction is sent to a part of the load switch to cut off the corresponding load; When it is determined that the voltage drop of the industrial microgrid is greater than a second preset amplitude, the photovoltaic power generation equipment and the fuel power generation equipment are controlled to cut load, and a closing instruction is sent to part of the load switches to cut off the corresponding load.

4. The in-depth defense operation management method applicable to stable control of industrial microgrids according to claim 1 is characterized in that: After obtaining the operating status of the industrial microgrid, the following steps are included: When it is determined that the industrial microgrid has a frequency collapse or a voltage collapse, the energy storage device and the fuel power generation device are controlled to be disconnected.

5. The in-depth defense operation management method applicable to stable control of industrial microgrids according to claim 1 is characterized in that: After obtaining the operating status of the industrial microgrid, the following steps are included: When it is determined that the industrial microgrid is completely dark, the energy storage device and the fuel power generation device are controlled to be zero-loaded. After the energy storage device and the fuel power generation device are zero-loaded, the photovoltaic power generation device and the load are controlled to be incorporated into the industrial microgrid.

6. The in-depth defense operation management method applicable to stable control of industrial microgrids according to claim 1 is characterized in that: After obtaining the operating status of the industrial microgrid, the following steps are included: When it is determined that there is a device fault in the industrial microgrid, controlling the operation of the device in the industrial microgrid based on the type of the fault; When the fault type is a power supply side equipment fault, reducing the load and increasing the output of the remaining power of the photovoltaic power generation equipment and the energy storage equipment; When the fault type is a load-side equipment fault, the photovoltaic power generation equipment is controlled to reduce power generation output.

7. A defense-in-depth operation management device suitable for stable control of industrial microgrids, characterized in that: The device comprises: A grid status acquisition module, used to acquire the operating status of an industrial microgrid, wherein the industrial microgrid includes power supply points, energy storage equipment, and industrial loads, and the power supply points in the industrial microgrid include photovoltaic power generation equipment, solar thermal power generation equipment, and fuel power generation equipment; The control strategy execution module is used for, when it is determined that the operating state of the industrial microgrid is isolated grid operation: Based on the frequency fluctuation of the industrial microgrid, a frequency signal is sent to the photovoltaic power generation equipment for power regulation to perform a primary frequency modulation, the frequency signal and a first active power control instruction are sent to the energy storage device in the industrial microgrid to perform a primary frequency modulation, and the charge state of the energy storage device is managed, a second active power control instruction is sent to the power source point to perform a secondary frequency modulation, and a start permission signal is sent to the load device based on the operating state of the industrial microgrid; According to the voltage disturbance of the industrial microgrid, a voltage signal is sent to the photovoltaic power generation equipment, the energy storage equipment and the fuel power generation equipment to perform reactive power-voltage droop control for primary voltage regulation, a second reactive control instruction is sent to the solar thermal power generation equipment and the transformer for secondary voltage regulation, and a third reactive control instruction is sent to the reactive power compensation device to provide reactive compensation.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the in-depth defense operation management method applicable to the stable control of an industrial microgrid as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the in-depth defense operation management method suitable for stable control of an industrial microgrid is implemented as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the in-depth defense operation management method suitable for stable control of an industrial microgrid is implemented as described in any one of claims 1 to 6.

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