Power grid control method and device, computer equipment and readable storage medium

Abstract

The invention relates to a power grid control method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring operation state information of each power generation device and each load in the offshore floating isolated power grid system in real time; inputting the running state information into a pre-trained control model to obtain power generation strategies of the conventional generator set and the renewable energy generator set; and controlling the corresponding conventional generator set and the renewable energy generator set based on the power generation strategy. By adopting the method, the safe operation of the offshore floating isolated power grid system can be ensured.

Description

Technical Field

[0001] The present application relates to the field of power grid technology, and in particular to a power grid control method, device, computer equipment and computer-readable storage medium. Background Art

[0002] With the rapid development of offshore energy development, offshore floating platforms and isolated power grid systems have gradually become the core of marine engineering. Offshore floating isolated power grid systems rely on local power generation devices or renewable energy such as wind power and solar energy to provide power support for the platform.

[0003] However, since the isolated power grid system is not connected to the onshore power grid, it is difficult to provide power quickly and stably when the load fluctuates or the power fluctuates (especially fluctuations in renewable energy such as wind power), which may cause frequency and voltage fluctuations, and thus affect the safe operation of the platform. Summary of the invention

[0004] Based on this, it is necessary to provide a power grid control method, device, computer equipment and computer-readable storage medium that can ensure the safe operation of an offshore floating isolated power grid system in response to the above technical problems.

[0005] In a first aspect, the present application provides a power grid control method, which is applied to a power grid control system corresponding to an offshore floating isolated power grid system, and the method comprises:

[0006] Real-time collection of operating status information of each power generation equipment and each load in the offshore floating isolated power grid system;

[0007] Inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation units and renewable energy power generation units;

[0008] The corresponding conventional power generation sets and renewable energy power generation sets are controlled based on the power generation strategy.

[0009] In one embodiment, the power generation strategy includes at least one of the following:

[0010] Adjust the PQ power generation state of the wind power generator set based on the predicted power of the wind power generator set, perform peak shaving and valley filling and primary frequency regulation through the energy storage system, and control the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and

[0011] When the lighting conditions meet the preset requirements, the power generation state of the photovoltaic power generation group is adjusted to the target state, and the peak is eliminated through the energy storage system, and the power and voltage of the conventional power generation group are controlled to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0012] In one embodiment, the frequency / active power automatic control strategy includes at least one of the following:

[0013] In the no-difference mode, the generator speed of the conventional generator set is compared with the given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and

[0014] In the differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0015] In one embodiment, the voltage / reactive power automatic control strategy includes at least one of the following:

[0016] In the differential-free mode, the conventional generator set is controlled to operate at a fixed voltage;

[0017] In the differential mode and when the load is purely resistive, the conventional generator set is controlled neither to increase the excitation nor to reduce the excitation;

[0018] In the case of differential mode and inductive load, controlling the conventional generator set to reduce excitation;

[0019] In the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0020] In one embodiment, the method further comprises:

[0021] When there is a power generation branch fault and the offshore floating isolated power grid system is in an unstable state, the load branch is cut off, and the power generation and load balance and frequency change trend before and after the cut off are compared;

[0022] In the case where the power generation and load before and after the removal are unbalanced, increasing the number of load branches to be removed until the offshore floating isolated power grid system is in a stable state;

[0023] In case of a load branch fault, the power generation branch is cut off, and the power generation and load balance as well as the frequency change trend before and after the cut off are compared;

[0024] In the case where the power generation and load before and after the removal are unbalanced, the number of removed power generation branches is increased until the offshore floating isolated power grid system is in a stable state.

[0025] In one embodiment, the method further comprises:

[0026] In the case where the photovoltaic power generation resistance in the renewable energy power generation unit fluctuates, the power output is controlled to be a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

[0027] In one embodiment, the method further comprises:

[0028] The battery energy storage module is controlled by adopting any one of the constant power charge and discharge control strategy and the power difference control strategy.

[0029] In a second aspect, the present application further provides a power grid control device, which is applied to a power grid control system corresponding to an offshore floating isolated power grid system, and the device comprises:

[0030] The acquisition module is used to collect the operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time;

[0031] A power generation strategy generation module, used for inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation units and renewable energy power generation units;

[0032] A control module is used to control the corresponding conventional generator set and renewable energy generator set based on the power generation strategy.

[0033] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0034] In a fourth aspect, the present application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0035] The above-mentioned power grid control method, device, computer equipment and computer-readable storage medium collect the operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time; input the operating status information into the pre-trained control model to obtain the power generation strategy of the conventional power generation set and the renewable energy power generation set; control the corresponding conventional power generation set and renewable energy power generation set based on the power generation strategy, obtain the power generation strategy of the conventional power generation set and the renewable energy power generation set through the pre-trained control model, and control the corresponding conventional power generation set and the renewable energy power generation set based on the power generation strategy, so as to realize efficient power dispatching and improve the stability and safety of the offshore floating isolated power grid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] FIG1 is a schematic diagram of a power control system in one embodiment;

[0038] FIG2 is a schematic flow chart of a power grid control method in one embodiment;

[0039] FIG3 is a schematic diagram of a zero-difference mode in one embodiment;

[0040] FIG4 is a schematic diagram of a differential mode in one embodiment;

[0041] FIG5 is an example diagram of load distribution and transfer of one conventional generator set without differential and one conventional generator set with differential in one embodiment;

[0042] FIG6 is a schematic diagram of reactive power droop control of a resistive load in one embodiment;

[0043] FIG7 is a schematic diagram of reactive power droop control of an inductive load in one embodiment;

[0044] FIG8 is a schematic diagram of reactive droop control of a capacitive load in one embodiment;

[0045] FIG9 is a schematic diagram of a power generation payment failure simulation in one embodiment;

[0046] FIG10 is a structural block diagram of a power grid control device in one embodiment;

[0047] FIG. 11 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] The power grid control method provided in the embodiment of the present application can be applied to the power control system as shown in Figure 1, wherein the power control system includes a data acquisition and monitoring module, an intelligent scheduling module, a frequency or active power automatic control module, a voltage and reactive power automatic control module, a unit / load quick switching module, a wind power prediction module, a battery energy storage management module and a photovoltaic power generation module. The data acquisition and monitoring module is used to collect the operating status information of each power generation equipment and each load of the offshore floating isolated power grid system. The operating status information is input into the pre-trained control model to obtain the power generation strategy of the conventional generator set and the renewable energy generator set; based on the power generation strategy, the corresponding conventional generator set and renewable energy generator set are controlled to achieve efficient power scheduling and improve the stability and safety of the offshore floating isolated power grid system.

[0050] In an exemplary embodiment, as shown in FIG2 , a power grid control method is provided, which is described by taking the method applied to the power control system in FIG1 as an example, and includes the following steps 202 to 206. Among them:

[0051] S202: Collecting operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time.

[0052] Among them, the offshore floating isolated power grid system refers to an independent power system located in the ocean and relying on floating platforms (such as FPSO or FLNG) to provide power support. This system is usually not connected to the onshore power grid and relies on local power generation devices and renewable energy.

[0053] The power generation equipment includes conventional generator sets and renewable energy generator sets. Renewable energy refers to energy that is obtained from nature and can be used sustainably, such as solar energy, wind energy, water energy, etc., and has the characteristics of low carbon and environmental protection. Among them, the renewable energy generator set includes at least one of a wind power generator set, a water power generator set, and a photovoltaic generator set. Conventional generator sets can be obtained based on floating production storage and offloading devices and floating liquefied natural gas.

[0054] Floating Production Storage and Offloading (FPSO) is a floating platform used for offshore oil and gas production, with crude oil storage and processing capabilities. Floating Liquefied Natural Gas (FLNG) is a floating platform used for offshore natural gas processing and liquefaction, which can convert natural gas into liquid form for easy transportation and storage.

[0055] The data acquisition and monitoring module is used for real-time monitoring of floating isolated power grid systems. Real-time monitoring refers to system components used to continuously measure and record the operating status of the power grid (such as voltage, frequency, load, etc.), which can provide accurate real-time data to support power dispatching and control.

[0056] The data acquisition and monitoring module collects the real-time operation data of the offshore floating power grid system and issues control instructions to the PMS system. It mainly monitors the operation status of conventional generators, wind power generators, photovoltaic generators, energy storage and other power generation equipment and loads and regulates them. For example, it collects signals such as voltage, current, frequency, active power, reactive power, and operation mode, as well as control instructions such as active power, reactive power, cutting units, cutting loads, and control modes. In addition to being used as control criteria, these data are also used for human-computer interaction after system integration.

[0057] S204: Inputting the operation status information into the pre-trained control model to obtain the power generation strategies of the conventional power generation unit and the renewable energy power generation unit.

[0058] The power generation strategy is generated based on the intelligent scheduling module. Intelligent scheduling refers to the use of algorithms and decision-making models to optimize the scheduling of conventional power generation equipment and energy storage systems based on real-time data to achieve a balance between electricity supply and demand and improve system stability.

[0059] The control model in this application is obtained by learning and correcting historical data and adjustment instructions and gradually improving the model data.

[0060] Intelligent dispatching is responsible for rationally allocating the power generation strategies of conventional generators and renewable energy when renewable energy sources such as wind power and solar energy are connected to ensure that the power system can provide a stable and reliable power supply.

[0061] Optionally, the control model can predict the power in a future time period based on historical data, so that the power generation strategy of the conventional generator set and the renewable energy can be adjusted based on the power in the future time period.

[0062] S206: Control corresponding conventional power generation units and renewable energy power generation units based on the power generation strategy.

[0063] Optionally, in the present application, corresponding conventional generator sets and renewable energy generator sets are controlled based on power generation strategies to ensure the stability and safety of the offshore floating isolated power grid system.

[0064] Optionally, the power generation strategy includes at least one of the following: adjusting the PQ power generation state of the wind turbine generator set based on the predicted power of the wind turbine generator set, performing peak shaving and valley filling and primary frequency regulation through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and when the lighting conditions meet the preset requirements, adjusting the power generation state of the photovoltaic generator set to the target state, performing peak shaving through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0065] In this embodiment, the predicted power of the wind turbine generator set can be predicted, and the predicted power can include the predicted power of different time periods, such as the predicted power of wind power for 15min-4h and 0-72h. Subsequently, according to the predicted power of the wind turbine generator set for 15min-4h and 0-72h, the conventional generator set is reduced, and the wind turbine generator set is prioritized to be in the PQ power generation state. At the same time, in order to solve the volatility, intermittency and randomness of the wind turbine generator set, the energy storage system first performs peak shaving and valley filling and primary frequency regulation, and then AGC (Auto Generation Control, through the automatic control program, realizes the automatic readjustment and distribution of the active output of each generator set in the control area to maintain the system frequency and the interconnection line exchange power within the planned target range) and AVR (Automatic Voltage Regulator, a synchronous generator regulator that maintains the voltage of the synchronous generator at a predetermined value or changes the terminal voltage according to the plan. When the terminal voltage, reactive power, etc. of the synchronous motor change, the output current of the exciter is automatically controlled according to the corresponding feedback signal to achieve the purpose of automatically adjusting the terminal voltage or reactive power of the synchronous motor.) Control the conventional generator set to ensure that the power and voltage are finally in a balanced state.

[0066] In other embodiments, when the lighting conditions meet preset requirements, such as when the lighting conditions are good during the day, the photovoltaic generator set is in the maximum power generation state, the energy storage system performs peak shaving, and the AGC and AVR adjust the conventional generator set to balance power and voltage according to the fluctuation conditions.

[0067] The above-mentioned power grid control method collects the operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time; inputs the operating status information into the pre-trained control model to obtain the power generation strategy of the conventional power generation unit and the renewable energy power generation unit; controls the corresponding conventional power generation unit and the renewable energy power generation unit based on the power generation strategy, obtains the power generation strategy of the conventional power generation unit and the renewable energy power generation unit through the pre-trained control model, and controls the corresponding conventional power generation unit and the renewable energy power generation unit based on the power generation strategy, which can realize efficient power dispatching and improve the stability and safety of the offshore floating isolated power grid system.

[0068] In one of the optional embodiments, the frequency / active power automatic control strategy includes at least one of the following: in a zero-difference mode, the generator speed of the conventional generator set is compared with a given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and in a differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0069] AGC (Auto Generator Control) can realize the automatic frequency / active power control of conventional generator sets. According to the control mode, it can work in the non-differential mode (ISOCH) or the differential mode (DROOP). In the non-differential mode, the generator speed (frequency) is collected and compared with the given speed (frequency) in real time, and the fuel valve is adjusted according to the difference value after ISOCH calculation to ensure that the generator set always works at the given speed (frequency). Its control model is shown in Figure 3.

[0070] The differential mode means that the speed and load curve is a straight line with a drooping curve, generally with a slip rate of 3-5%. The frequency reference value of the generator set without load can be set to adjust its load rate at the rated frequency, and the load distribution and transfer can be achieved by cooperating with the generator set in the non-differential mode. The differential control model is shown in Figure 4.

[0071] For ease of understanding, FIG5 is an example of load distribution and transfer between one conventional generator set without differential and one conventional generator set with differential in one embodiment (taking 60 Hz as an example).

[0072] In addition, when the generator set works in differential mode, the power output is automatically adjusted according to the load changes; when the generator set works in non-differential mode, the generator set always works at a given frequency and voltage, and automatically adjusts the output according to the load changes.

[0073] In one of the optional embodiments, the voltage / reactive power automatic control strategy includes at least one of the following: in the non-difference mode, the conventional generator set is controlled to operate at a fixed voltage; in the differential mode and when the load is purely resistive, the conventional generator set is controlled not to increase excitation or reduce excitation; in the differential mode and when the load is inductive, the conventional generator set is controlled to reduce excitation; in the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0074] The voltage / reactive power automatic control mode is similar to the frequency / active power control, which is divided into reactive power droop compensation control (with difference) and fixed voltage control (without difference). When the generator set operates in the without difference mode, the voltage is regulated as the specified voltage control (without difference), and when the generator set operates in the differential mode, the reactive power is droop compensation control. The control principle of reactive power droop control under pure resistive, capacitive and inductive loads with different characteristics is shown in Figures 6 to 8. Specifically:

[0075] 6 , in the case of resistive load, the angles between Vac and Ib and between Vac and VDERIVED are 90 degrees, and VSUMMATION is almost the same as Vac, so the AVR does not control the increase or decrease of the generator excitation, that is, it neither increases nor decreases the excitation.

[0076] Combined with Figure 7, in the case of inductive load, Ib lags behind Vb, the angle between Vac and VDERIVED is greater than 90 degrees, at this time VSUMMATION is greater than Vac and increases as the angle between Vac and VDERIVED increases. At this time, the AVR sends a reduction excitation command to the generator to reduce the terminal voltage.

[0077] Combined with Figure 8, in the case of capacitive load, Ib leads Vb, the angle between Vac and VDERIVED is less than 90 degrees, VSUMMATION is less than Vac and decreases as the angle between Vac and VDERIVED decreases. Therefore, the AVR increases the excitation of the generator to increase the terminal voltage.

[0078] In one of the optional embodiments, the method further includes: when there is a fault in a power generation branch and the offshore floating isolated power grid system is in an unstable state, cutting off the load branch, and comparing the balance of power generation and load before and after cutting off and the changing trend of frequency; when there is an imbalance between power generation and load before and after cutting off, increasing the number of load branches cut off until the offshore floating isolated power grid system is in a stable state; when there is a fault in a load branch, cutting off the power generation branch, and comparing the balance of power generation and load before and after cutting off and the changing trend of frequency; when there is an imbalance between power generation and load before and after cutting off, increasing the number of power generation branches cut off until the offshore floating isolated power grid system is in a stable state.

[0079] The unit / load quick shedding control strategy is developed based on the simulation analysis of the power generation branch and large load branch faults. When the power generation branch fault causes the isolated power grid to be unstable, the load branch is quickly shelved. After the quick shedding logic is triggered, the quick shedding IED begins to compare the power generation and load balance before and after shedding as well as the frequency change trend in real time. If there is an imbalance, the shedding quantity is increased until the power grid reaches a stable state.

[0080] On the contrary, if the load branch fails, the power generation branch will be cut off according to the control strategy, and in the case of an imbalance between the power generation and load before and after the cut-off, the number of cut-off power generation branches will be increased until the offshore floating isolated power grid system is in a stable state.

[0081] (1) in Figure 9 simulates a fault in a power generation branch. The frequency of the power generation branch fault decreases rapidly, but the frequency of the support capacity (reserve capacity) of other units in the benefiting power grid is finally stabilized, so there is no need to quickly remove the load. (2) in Figure 9 is a schematic diagram of voltage stabilization after fluctuation.

[0082] In one of the optional embodiments, the method further includes: in the case where the photovoltaic power generation resistance in the renewable energy generator set fluctuates, the output power is controlled to a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

[0083] For the volatility of photovoltaic power generation, the control strategy is the constant power (PQ) control mode. The voltage and frequency are given by the offshore floating isolated power grid system. The output power is controlled to a given value by controlling the current, that is, the given voltage and frequency.

[0084] In one of the optional embodiments, the method further includes: controlling the battery energy storage module by adopting any one of a constant power charge and discharge control strategy and a power difference control strategy.

[0085] Battery energy storage is used for peak shaving and valley filling on the one hand, and for fixed grid on the other hand, that is, to quickly suppress the frequency and voltage drop when other power generation branches fail. The control strategy of the battery grid-connected inverter adopts constant power charging and discharging control strategy and power difference control strategy, which is similar to the difference-free control and difference control of conventional generators.

[0086] In the above embodiment, by applying the PMS (Power Management System is a technology and tool for monitoring, controlling and optimizing the power system, which can realize real-time dispatching of power, fault monitoring and recovery, and efficient utilization of energy resources) stability technology, the offshore floating isolated power grid system can solve the following problems:

[0087] Frequency and voltage stability: The system can intelligently dispatch renewable energy and conventional power generation equipment to ensure the stability of system frequency and voltage.

[0088] Rapid recovery from system failures: When a power grid failure occurs, the system can quickly locate the fault point and take emergency measures.

[0089] Energy saving and environmental protection: By rationally utilizing clean energy such as wind power and solar energy, the power generation cost and carbon emissions of offshore floating platforms can be reduced.

[0090] Long-term stable operation: Through predictive analysis, the power dispatch strategy is adjusted in advance to ensure that the system can operate stably for a long time and reduce downtime.

[0091] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0092] Based on the same inventive concept, the embodiment of the present application also provides a power grid control device for implementing the power grid control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more power grid control device embodiments provided below can refer to the limitations of the power grid control method above, and will not be repeated here.

[0093] In an exemplary embodiment, as shown in FIG10 , a power grid control device is provided, which is applied to a power grid control system corresponding to an offshore floating isolated power grid system, and includes: a collection module 1001, a power generation strategy generation module 1002 and a control module 1003, wherein:

[0094] The acquisition module 1001 is used to collect the operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time;

[0095] The power generation strategy generation module 1002 is used to input the operation status information into the pre-trained control model to obtain the power generation strategies of the conventional power generation unit and the renewable energy power generation unit;

[0096] The control module 1003 is used to control the corresponding conventional generator sets and renewable energy generator sets based on the power generation strategy.

[0097] In one of the optional embodiments, the power generation strategy includes at least one of the following: adjusting the PQ power generation state of the wind turbine generator set based on the predicted power of the wind turbine generator set, performing peak shaving and valley filling and primary frequency regulation through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and when the lighting conditions meet the preset requirements, adjusting the power generation state of the photovoltaic generator set to the target state, performing peak shaving through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0098] In one of the optional embodiments, the frequency / active power automatic control strategy includes at least one of the following: in a zero-difference mode, the generator speed of the conventional generator set is compared with a given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and in a differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0099] In one of the optional embodiments, the voltage / reactive power automatic control strategy includes at least one of the following: in the non-difference mode, the conventional generator set is controlled to operate at a fixed voltage; in the differential mode and when the load is purely resistive, the conventional generator set is controlled not to increase excitation or reduce excitation; in the differential mode and when the load is inductive, the conventional generator set is controlled to reduce excitation; in the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0100] In one of the optional embodiments, the above-mentioned device also includes: a fault processing module, which is used to cut off the load branch when there is a power generation branch fault and the offshore floating isolated power grid system is in an unstable state, and compare the power generation and load balance before and after the cutting and the frequency change trend; when the power generation and load are unbalanced before and after the cutting, increase the number of load branches cut off until the offshore floating isolated power grid system is in a stable state; when there is a load branch fault, cut off the power generation branch, and compare the power generation and load balance before and after the cutting and the frequency change trend; when the power generation and load are unbalanced before and after the cutting, increase the number of power generation branches cut off until the offshore floating isolated power grid system is in a stable state.

[0101] In one of the optional embodiments, the above-mentioned device also includes: a photovoltaic control module, which is used to control the output power to a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system when there is fluctuation in the photovoltaic power generation resistance in the renewable energy generator set.

[0102] In one of the optional embodiments, the above-mentioned device further includes: an energy storage module control module, which is used to control the battery energy storage module by adopting any one of a constant power charging and discharging control strategy and a power difference control strategy.

[0103] Each module in the above-mentioned power grid control device can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0104] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG11. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store a control model. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a power grid control method is implemented.

[0105] Those skilled in the art will understand that the structure shown in FIG. 11 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0106] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: real-time collection of operating status information of each power generation equipment and each load in an offshore floating isolated power grid system; inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation sets and renewable energy power generation sets; and controlling the corresponding conventional power generation sets and renewable energy power generation sets based on the power generation strategy.

[0107] In one embodiment, the power generation strategies involved when the processor executes the computer program include at least one of the following: adjusting the PQ power generation state of the wind turbine generator set based on the predicted power of the wind turbine generator set, performing peak shaving and valley filling and primary frequency modulation through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and when the lighting conditions meet the preset requirements, adjusting the power generation state of the photovoltaic generator set to the target state, performing peak shaving through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0108] In one embodiment, the frequency / active power automatic control strategy involved when the processor executes the computer program includes at least one of the following: in a zero-difference mode, the generator speed of the conventional generator set is compared with a given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and in a differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0109] In one embodiment, the voltage / reactive power automatic control strategy involved when the processor executes the computer program includes at least one of the following: in the non-differential mode, the conventional generator set is controlled to operate at a fixed voltage; in the differential mode and when the load is purely resistive, the conventional generator set is controlled not to increase excitation or reduce excitation; in the differential mode and when the load is inductive, the conventional generator set is controlled to reduce excitation; in the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0110] In one embodiment, the processor further implements the following steps when executing the computer program: when there is a power generation branch fault and the offshore floating isolated power grid system is in an unstable state, the load branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of load branches cut off is increased until the offshore floating isolated power grid system is in a stable state; when there is a load branch fault, the power generation branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of power generation branches cut off is increased until the offshore floating isolated power grid system is in a stable state.

[0111] In one embodiment, when the processor executes the computer program, the following steps are also implemented: when there is fluctuation in the photovoltaic power generation resistance in the renewable energy generator set, the power output is controlled to a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

[0112] In one embodiment, when the processor executes the computer program, the following steps are further implemented: using any one of a constant power charge and discharge control strategy and a power difference control strategy to control the battery energy storage module.

[0113] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: real-time collection of operating status information of each power generation equipment and each load in the offshore floating isolated power grid system; inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation units and renewable energy power generation units; and controlling the corresponding conventional power generation units and renewable energy power generation units based on the power generation strategy.

[0114] In one embodiment, the power generation strategies involved when the computer program is executed by the processor include at least one of the following: adjusting the PQ power generation state of the wind turbine generator set based on the predicted power of the wind turbine generator set, performing peak shaving and valley filling and primary frequency regulation through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and when the lighting conditions meet the preset requirements, adjusting the power generation state of the photovoltaic generator set to the target state, performing peak shaving through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0115] In one embodiment, the frequency / active power automatic control strategy involved when the computer program is executed by the processor includes at least one of the following: in a zero-difference mode, the generator speed of the conventional generator set is compared with a given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and in a differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0116] In one embodiment, the voltage / reactive power automatic control strategy involved when the computer program is executed by the processor includes at least one of the following: in the non-differential mode, the conventional generator set is controlled to operate at a fixed voltage; in the differential mode and when the load is purely resistive, the conventional generator set is controlled not to increase excitation or reduce excitation; in the differential mode and when the load is inductive, the conventional generator set is controlled to reduce excitation; in the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0117] In one embodiment, the computer program, when executed by the processor, further implements the following steps: when there is a generation branch fault and the offshore floating isolated power grid system is in an unstable state, the load branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of load branches cut off is increased until the offshore floating isolated power grid system is in a stable state; when there is a load branch fault, the generation branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of generation branches cut off is increased until the offshore floating isolated power grid system is in a stable state.

[0118] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: in the case where the photovoltaic power generation resistance in the renewable energy generator group fluctuates, the power output is controlled to a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

[0119] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: using any one of a constant power charge and discharge control strategy and a power difference control strategy to control the battery energy storage module.

[0120] In one embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements the following steps: real-time collection of operating status information of each power generation equipment and each load in an offshore floating isolated power grid system; inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation sets and renewable energy power generation sets; and controlling the corresponding conventional power generation sets and renewable energy power generation sets based on the power generation strategies.

[0121] In one embodiment, the power generation strategies involved when the computer program is executed by the processor include at least one of the following: adjusting the PQ power generation state of the wind turbine generator set based on the predicted power of the wind turbine generator set, performing peak shaving and valley filling and primary frequency regulation through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and when the lighting conditions meet the preset requirements, adjusting the power generation state of the photovoltaic generator set to the target state, performing peak shaving through the energy storage system, and controlling the power and voltage of the conventional generator set to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

[0122] In one embodiment, the frequency / active power automatic control strategy involved when the computer program is executed by the processor includes at least one of the following: in a zero-difference mode, the generator speed of the conventional generator set is compared with a given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and in a differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

[0123] In one embodiment, the voltage / reactive power automatic control strategy involved when the computer program is executed by the processor includes at least one of the following: in the non-differential mode, the conventional generator set is controlled to operate at a fixed voltage; in the differential mode and when the load is purely resistive, the conventional generator set is controlled not to increase excitation or reduce excitation; in the differential mode and when the load is inductive, the conventional generator set is controlled to reduce excitation; in the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

[0124] In one embodiment, the computer program, when executed by the processor, further implements the following steps: when there is a generation branch fault and the offshore floating isolated power grid system is in an unstable state, the load branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of load branches cut off is increased until the offshore floating isolated power grid system is in a stable state; when there is a load branch fault, the generation branch is cut off, and the balance of power generation and load before and after the cut off and the frequency change trend are compared; when the power generation and load before and after the cut off are unbalanced, the number of generation branches cut off is increased until the offshore floating isolated power grid system is in a stable state.

[0125] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: in the case where the photovoltaic power generation resistance in the renewable energy generator group fluctuates, the power output is controlled to a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

[0126] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: using any one of a constant power charge and discharge control strategy and a power difference control strategy to control the battery energy storage module.

[0127] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0128] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0129] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0130] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power grid control method, characterized in that: Applied to a power grid control system corresponding to an offshore floating isolated power grid system, the method comprises: Real-time collection of operating status information of each power generation equipment and each load in the offshore floating isolated power grid system; Inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation units and renewable energy power generation units; The corresponding conventional power generation sets and renewable energy power generation sets are controlled based on the power generation strategy.

2. The method according to claim 1, characterized in that The power generation strategy includes at least one of the following: The PQ power generation state of the wind power generator set is adjusted based on the predicted power of the wind power generator set, peak shaving and valley filling and primary frequency regulation are performed through the energy storage system, and the power and voltage of the conventional generator set are controlled to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy; and When the lighting conditions meet the preset requirements, the power generation state of the photovoltaic power generation group is adjusted to the target state, and the peak is eliminated through the energy storage system, and the power and voltage of the conventional power generation group are controlled to be in a balanced state through the frequency / active power automatic control strategy and the voltage / reactive power automatic control strategy.

3. The method according to claim 2, characterized in that The frequency / active power automatic control strategy includes at least one of the following: In the no-difference mode, the generator speed of the conventional generator set is compared with the given speed in real time, and the conventional generator set is adjusted based on the difference value of the comparison until the generator speed is equal to the given speed, and the conventional generator set is controlled to operate at a given frequency and voltage; and In the differential mode, based on the frequency reference value of the conventional generator set without load, the load rate of the conventional generator set at the rated frequency is adjusted until the generator speed and load curve of the conventional generator set is a drooping straight line, and the power output is adjusted based on the load change.

4. The method according to claim 2, characterized in that: The voltage / reactive power automatic control strategy includes at least one of the following: In the differential-free mode, the conventional generator set is controlled to operate at a fixed voltage; In the differential mode and when the load is purely resistive, the conventional generator set is controlled neither to increase the excitation nor to reduce the excitation; In the case of differential mode and inductive load, controlling the conventional generator set to reduce excitation; In the differential mode and when the load is capacitive, the conventional generator set is controlled to increase excitation.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: When there is a power generation branch fault and the offshore floating isolated power grid system is in an unstable state, the load branch is cut off, and the power generation and load balance and frequency change trend before and after the cut off are compared; In the case where the power generation and load before and after the removal are unbalanced, increasing the number of load branches to be removed until the offshore floating isolated power grid system is in a stable state; In case of a load branch fault, the power generation branch is cut off, and the power generation and load balance as well as the frequency change trend before and after the cut off are compared; In the case where the power generation and load before and after the removal are unbalanced, the number of removed power generation branches is increased until the offshore floating isolated power grid system is in a stable state.

6. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: In the case where the photovoltaic power generation resistance in the renewable energy power generation unit fluctuates, the power output is controlled to be a given value through current control based on the voltage and frequency given by the offshore floating isolated power grid system.

7. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: The battery energy storage module is controlled by adopting any one of the constant power charge and discharge control strategy and the power difference control strategy.

8. A power grid control device, characterized in that: Applicable to a power grid control system corresponding to an offshore floating isolated power grid system, the device comprises: The acquisition module is used to collect the operating status information of each power generation equipment and each load in the offshore floating isolated power grid system in real time; A power generation strategy generation module, used for inputting the operating status information into a pre-trained control model to obtain power generation strategies for conventional power generation units and renewable energy power generation units; A control module is used to control the corresponding conventional generator set and renewable energy generator set based on the power generation strategy.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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