Hybrid variable-speed pumped storage and chemical energy storage coordinated control system and method

Abstract

The invention discloses a hybrid variable-speed pumped storage and chemical energy storage coordinated control system and method, and the system comprises a hydroelectric generating set, the output of which is connected to a power grid through a switch; the output of the variable-speed pumped storage unit is connected to a power grid through a switch; the output of the photovoltaic module is respectively connected to the power grid and the chemical energy storage device through a double-pole double-throw switch; the chemical energy storage device is connected to a power grid through an interconnection switch, the chemical energy storage device comprises at least two sections of energy storage modules, and each section of energy storage module is formed by connecting a plurality of storage batteries in series; the monitoring device is used for realizing data monitoring, processing and coordination control of the whole system; the energy storage capacity of the hydroelectric generating set and the variable-speed pumped storage set is utilized, 10% of chemical energy storage is subjected to segmented contact operation, and redundant standby and mutual supply are performed between hydroelectric energy and chemical energy storage, so that reasonable distribution of energy under different power generation working conditions is realized, carbon emission is reduced, energy is saved, and the utilization rate of the energy storage unit is improved; and stable power grid operation is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of energy coordinated control, and in particular to a hybrid variable speed pumped storage and chemical energy storage coordinated control system and method. Background Art

[0002] The hydropower-photovoltaic-storage combined dispatching system is an energy coordination system mainly composed of hydropower units, photovoltaic power stations and energy storage devices. The existing hydropower-photovoltaic-storage combined dispatching system usually directly transmits the electricity generated by hydropower units and photovoltaic power stations to the busbar. However, since photovoltaic components are greatly affected by the external environment, they are prone to instantaneous flashover and other phenomena, which affects the stability of load power supply.

[0003] In addition, the energy storage device used in the existing hydro-solar-storage joint scheduling system, if a certain energy storage unit in the energy storage device encounters an abnormality or fault maintenance, the entire energy storage device needs to be powered off, which will cause the normal energy storage unit to be abnormally shut down and standby, affecting the utilization efficiency of the normal energy storage unit. Summary of the invention

[0004] In order to solve the problems of unstable load power supply due to instantaneous flashover of photovoltaic components and low utilization efficiency of normal energy storage units due to abnormal shutdown and standby of normal energy storage units, the present application proposes a hybrid variable-speed pumped storage and chemical energy storage coordinated control system and method. The present application utilizes existing hydropower units in combination with variable-speed pumped storage units as the main energy storage equipment for photovoltaic power generation, and operates 10% of the chemical energy storage in segmented communication, as well as redundant standby and mutual supply between hydropower and chemical energy storage, thereby realizing the reasonable allocation of energy under different power generation conditions.

[0005] This application is implemented through the following technical solutions:

[0006] A hybrid variable speed pumped storage and chemical energy storage coordinated control system, the coordinated control system comprising:

[0007] A hydroelectric generator set, the output of which is connected to the power grid through a switch;

[0008] A variable speed pumped storage unit, the output of which is connected to the power grid through a switch;

[0009] A photovoltaic module, the output of which is connected to a power grid and a chemical energy storage device respectively through a double-pole double-throw switch;

[0010] A chemical energy storage device, which is connected to the power grid through a connecting switch, and includes at least two energy storage sections, each of which is composed of a number of batteries connected in series, and each battery is controlled by a corresponding switch to be in use;

[0011] and, a monitoring device, the monitoring device being used to realize data monitoring, collection, processing and coordinated control of the entire system;

[0012] Among them, during the flood season, the hydroelectric unit, variable speed pumped storage unit and photovoltaic module are used as the main power supply equipment, the hydroelectric unit is also used as the main energy storage equipment of the photovoltaic module, and the chemical energy storage device is used as the backup energy storage equipment of the photovoltaic module. When the photovoltaic module generates electricity, when photovoltaic flashover occurs, the variable speed pumped storage unit is preferentially used to respond quickly to instantaneously fill the load flashover;

[0013] During the dry season, the hydropower unit, variable speed pumped storage unit, photovoltaic module and chemical energy storage device serve as the main power supply equipment, the chemical energy storage device serves as the main energy storage device of the photovoltaic module, the hydropower unit serves as the backup energy storage device of the photovoltaic module, and the variable speed pumped storage unit serves as the fast energy storage device of the photovoltaic module. When photovoltaic flashover occurs during power generation, the fast response characteristics of the variable speed pumped storage unit are preferentially used to instantaneously fill the load flashover.

[0014] In some embodiments, when the switch between the output of the photovoltaic module and the power grid is open, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, the output of the photovoltaic module first passes through the chemical energy storage device and then is sent to the power grid;

[0015] When the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is open, the output of the photovoltaic module is directly sent to the power grid and sent out along the same line as the hydropower unit, forming a water-solar bundled delivery mode. At this time, the hydropower unit serves as the energy storage device of the photovoltaic module;

[0016] When the switch between the output of the photovoltaic module and the power grid is closed, the switch between the output of the photovoltaic module and the chemical energy storage device is closed, and the output of the chemical energy storage device is closed to the switch on the power grid side, if the power grid needs a peak load, the photovoltaic module, the hydropower unit and the chemical energy storage device all serve as power supply equipment to generate electricity to the power grid; when the photovoltaic module is undergoing maintenance, the chemical energy storage device serves as a backup power supply to generate electricity to the power grid.

[0017] In some embodiments, when the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, if the hydropower unit needs to be overhauled and the factory power supply is required, the chemical energy storage device is used as the factory power supply;

[0018] When the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, if the hydropower unit has redundant load, the redundant electricity is stored in the chemical energy storage device.

[0019] In the second aspect, the present application proposes a coordinated control method based on the above-mentioned hybrid variable speed pumped storage and chemical energy storage coordinated control system, and the coordinated control method includes:

[0020] During the day, the photovoltaic module is controlled to generate electricity at full capacity, and the hydropower module is used as the main power source for photovoltaic power generation; when the water level is too high, the remaining power of the photovoltaic module is used as the power source for the plant, and the remaining photovoltaic power is stored through the chemical energy storage device, provided that the run-of-river power station does not abandon water.

[0021] At night, the hydroelectric components are controlled to generate electricity at full capacity, and the chemical energy storage device is used as a factory power supply or a backup power supply to reduce the use of diesel generators.

[0022] In some embodiments, when photovoltaic flashover occurs during power generation by the photovoltaic module, the fast response characteristics of the variable speed pumped storage unit are preferentially used to instantaneously fill the load flashover, and the unfilled load is instantly supplemented by the hydropower unit. When the load cannot be filled during maintenance of the hydropower unit, the chemical energy storage device is used to fill it.

[0023] In some embodiments, at night, since the photovoltaic module cannot generate electricity, the hydropower unit is used to generate electricity to pull the reservoir water level to the lowest water level, and the lowest water level operating state is maintained all night. During the day, according to the total load requirements, the load of the hydropower unit is dynamically adjusted according to the load of the photovoltaic module.

[0024] In some embodiments, the step of dynamically adjusting the load of the hydroelectric generator set according to the load of the photovoltaic module in accordance with the total load requirement specifically includes:

[0025] Obtain the current reservoir water flow, power generation flow and ecological flow in real time;

[0026] If the inflow flow is equal to the sum of the power generation flow and the ecological flow, it indicates that the reservoir flow is balanced and no load adjustment is performed;

[0027] If the water flow is less than the sum of the power generation flow and the ecological flow, it indicates that the reservoir inflow is insufficient and the hydropower unit needs to be adjusted to reduce load;

[0028] If the incoming water flow is greater than the sum of the power generation flow and the ecological flow, it indicates that the reservoir inflow is too large and the hydropower unit needs to be adjusted to increase the load or the gate needs to be opened for discharge control.

[0029] In some implementations, the load reduction adjustment process of the hydropower unit specifically includes:

[0030] First, according to the current load and water level of the hydropower unit, the time when the reservoir enters the extreme water level operation state and the load that needs to be adjusted are calculated;

[0031] Then, prompts are given based on the calculated parameters, and the corresponding adjustment mode is selected to perform load reduction adjustment.

[0032] In some implementations, the load adjustment process of the hydropower unit specifically includes:

[0033] First, according to the current load and water level of the hydropower unit, calculate the time when the reservoir enters the highest water level operation state and the load that needs to be adjusted, or calculate the gate opening height;

[0034] Then, prompts are given based on the calculated parameters, and the corresponding adjustment mode is selected to perform load increase adjustment or gate opening control.

[0035] In some embodiments, the time for the reservoir to enter the highest water level operation state is calculated as follows:

[0036]

[0037] Where V represents the total capacity of the reservoir; V T represents the current capacity of the reservoir at time T; Q 1i represents the discharge flow at time i; Δt is the interval time;

[0038] The downstream flow rate is equal to the difference between the water flow rate at the corresponding moment and the power generation flow rate and the ecological flow rate;

[0039] The gate opening height is calculated as follows:

[0040] Q=CKH N

[0041] Among them, Q represents the downstream flow, which is equal to the sum of the downstream flow and the ecological flow; C represents the gate opening height; K is a constant, which depends on the unit of measurement of the flow; H represents the current power generation head; N is an index.

[0042] The application proposes a hybrid variable speed pumped storage and chemical energy storage coordinated control system and method, which utilizes the energy storage capacity of the hydropower unit and the variable speed pumped storage unit, and performs segmented interconnection operation of 10% of the chemical energy storage, as well as redundant standby and mutual supply between hydropower and chemical energy storage, thereby realizing the reasonable allocation of energy under different power generation conditions, reducing carbon emissions, saving energy, improving the utilization rate of energy storage units, and ensuring the stable operation of the power grid;

[0043] The application proposes a hybrid variable speed pumped storage and chemical energy storage coordinated control system and method. When photovoltaic flashover occurs during photovoltaic module power generation, the variable speed pumped storage unit's fast response characteristics are preferentially used to instantaneously fill the load flashover to ensure load stability.

[0044] The application proposes a hybrid variable-speed pumped storage and chemical energy storage coordinated control system and method, which adopts a segmented energy storage device. On the one hand, redundant standby can be achieved to avoid the impact of maintenance or abnormal power failure of the chemical energy storage device on the entire system; on the other hand, when the energy storage and power supply of a certain energy storage module are insufficient, another energy storage module can be put into use as a backup power supply; at the same time, each energy storage module is composed of a number of batteries, which can be combined in any way to achieve energy storage and power supply of different power sizes, thereby improving the scope of application and flexibility of the chemical energy storage device; on the other hand, it also avoids the abnormal shutdown of normal batteries, improves the use efficiency of the batteries and extends the service life of the batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0046] Figure 1 A schematic diagram of the coordinated control system architecture provided in an embodiment of the present application;

[0047] Figure 2 A flow chart of dynamic load adjustment of a hydropower unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] Hereinafter, the term "include" or "may include" used in various embodiments of the present application indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. In addition, as used in various embodiments of the present application, the terms "include", "have" and their cognates are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the presence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items.

[0049] In various embodiments of the present application, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed at the same time. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0050] The expressions (such as "first", "second", etc.) used in the various embodiments of the present application may modify the various constituent elements in the various embodiments, but may not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present application, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0051] It should be noted that if it is described that one component element is “connected” to another component element, the first component element may be directly connected to the second component element, and a third component element may be “connected” between the first component element and the second component element. Conversely, when one component element is “directly connected” to another component element, it can be understood that there is no third component element between the first component element and the second component element.

[0052] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0053] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0054] Example:

[0055] In the existing hydro-photovoltaic-storage joint dispatching system, the instantaneous flashover generated by the photovoltaic module will cause unstable load power supply; in addition, the abnormal shutdown of the normal energy storage unit will affect its utilization efficiency. In view of this, this embodiment proposes a hybrid variable-speed pumped storage and chemical energy storage coordinated control system. The coordinated control system proposed in this embodiment utilizes the energy storage capacity of the hydropower unit and the variable-speed pumped storage unit, and performs segmented interconnection operation of 10% of the chemical energy storage, as well as redundant standby and mutual supply between hydropower and chemical energy storage, so as to achieve reasonable energy distribution under different power generation conditions, reduce carbon emissions, save energy, improve the utilization rate of energy storage units, and ensure stable operation of the power grid.

[0056] Specific as Figure 1 As shown, the coordinated control system proposed in this embodiment includes:

[0057] Hydropower unit, the hydropower unit (such as Figure 1 The output of 1G, 2G, etc.) is connected to the power grid through a switch (such as Figure 1 The low-voltage busbar connected to the power grid is the 10.5KV busbar; the low-voltage busbar is connected to the high-voltage busbar, i.e. the 220KV busbar, through a transformer, etc.

[0058] Variable speed pumped storage unit, the variable speed pumped storage unit (such as Figure 1 The output of 3G (etc.) is connected to the grid through a switch;

[0059] A photovoltaic module, the output of which is connected to a power grid and a chemical energy storage device respectively through a double-pole double-throw switch;

[0060] A chemical energy storage device, the chemical energy storage device comprising at least two energy storage sections, each of which is composed of a number of batteries connected in series, and each battery is controlled by a corresponding switch to be put into use; the energy storage device connects at least two energy storage modules to the power grid through a connecting switch;

[0061] And, a monitoring device (not shown in the figure), which is used to monitor, collect and process relevant parameters such as hydropower units, variable speed pumped storage units, photovoltaic modules, chemical energy storage devices and loads, and coordinate control according to corresponding coordinated control methods.

[0062] Among them, during the flood season, hydropower units, variable-speed pumped storage units and photovoltaic modules are used as the main power supply equipment, and hydropower units are used as the main energy storage equipment of photovoltaic modules; chemical energy storage devices are used as backup energy storage equipment for photovoltaic modules and backup power supply for the system; when photovoltaic flashover occurs during power generation, the fast response characteristics of variable-speed pumped storage units are used first to instantaneously fill the load flashover;

[0063] During the dry season, hydropower units, variable-speed pumped storage units, photovoltaic modules and chemical energy storage devices serve as the main power supply equipment; chemical energy storage devices serve as the main energy storage equipment of photovoltaic modules, hydropower units serve as backup energy storage equipment of photovoltaic modules, and variable-speed pumped storage units serve as fast energy storage equipment of photovoltaic modules; when photovoltaic flashover occurs during power generation, the fast response characteristics of variable-speed pumped storage units are preferentially used to instantaneously fill the load flashover.

[0064] Furthermore, the photovoltaic module is connected to the grid and the chemical energy storage device through the double-pole double-throw switch QS1. Among them, when the QS1a switch is closed and the QS1b switch is open, the photovoltaic power generation is first sent to the grid through the chemical energy storage device, thus avoiding the impact of direct photovoltaic power generation on the grid; when the QS1a switch is open and the QS1b switch is closed, the photovoltaic power generation is conventionally sent to the grid and sent out on the same line as the hydropower unit, forming a water-solar bundled delivery method. At this time, the hydropower unit, as the energy storage device of the photovoltaic component, avoids the fluctuation of the load on the grid side, and distributes the pressure of load adjustment to the transporter side, which is more conducive to reducing the risk of grid load fluctuation and the isolated king phenomenon caused by excessive load fluctuation. In addition, it is also conducive to the maintenance and regular testing of the chemical energy storage device, and does not affect the quality of photovoltaic power generation; when the QS1a switch is closed and the QS1b switch is closed, and the output of the chemical energy storage device is closed with the switch on the grid side, when the grid needs a peak load, photovoltaic, hydropower, and chemical energy storage can all be used as power supply equipment to generate electricity to the grid to meet the peak load demand. In addition, when the photovoltaic panels are under maintenance, the chemical energy storage device can also be used as a backup power source to generate electricity for the grid.

[0065] In addition, when the hydropower unit needs to be overhauled and the factory power supply is needed, the QS1a switch and the QS1b switch can be closed. At this time, the chemical energy storage device can be used as the factory power supply. In addition, when the hydropower unit has redundant load, the electricity can also be stored in the chemical energy storage device. For daily adjustment power stations, the utilization efficiency of water resources can be improved and the water abandonment rate of the power station can be reduced.

[0066] Furthermore, the chemical energy storage device connects at least two energy storage sections to the grid via a tie switch QS2, such as Figure 1 As shown in , the chemical energy storage device includes two energy storage sections, which can be redundant with each other, and the switching of the two energy storage sections can be realized by switching control of the connecting switch. It should be noted that Figure 1This is only an exemplary description and does not limit the number of energy storage segments in the chemical energy storage device. That is, in other optional implementations, three or even more energy storage segments can also be set. This embodiment can achieve backup in the event of overall failure, abnormality or maintenance of a certain energy storage module by controlling the chemical energy storage device in sections, thereby avoiding the impact of power outages of the chemical energy storage device on the entire system; and when the energy storage power supply of a certain energy storage segment is insufficient, another energy storage segment can be used as a backup power source.

[0067] In addition, each energy storage section is composed of several batteries connected in series, and each battery is connected in parallel with a switch, and the corresponding battery is controlled by controlling the switch. On the one hand, this setting can arbitrarily combine batteries to achieve energy storage and power supply of different power sizes, which improves the application range and flexibility of chemical energy storage devices; on the other hand, when it is monitored that the current voltage value of the battery does not meet the voltage threshold requirement, the battery is isolated, and the battery is inspected and charged and discharged without affecting the normal operation of the remaining batteries, avoiding abnormal shutdown of normal batteries, improving the use efficiency of the battery and extending the service life of the battery.

[0068] Based on the above coordinated control system, this embodiment further proposes a coordinated control method, which specifically includes:

[0069] During the day, the photovoltaic components generate electricity at full capacity, and hydropower is used as the main power source for photovoltaic adjustment (i.e., according to the requirements of the total load, the load of the hydropower unit is adjusted according to the photovoltaic load). When the water level is too high (i.e., the power generation of the hydropower components is too large, resulting in surplus photovoltaic power generation), the principle of not abandoning water in run-of-river power stations is given priority, and the surplus photovoltaic power is used as the power source for the entire plant and stored through chemical energy storage devices at the same time (the surplus photovoltaic power is used as the power source for the plant, and when there is surplus, it is stored through chemical energy storage devices); at night, the hydropower generates electricity at full capacity, and the chemical energy storage device is used to supply the power source or backup power source for the power station and the gate, saving the power cost of the power station, while enabling the power station to save the use of diesel generators, etc., and reduce carbon emissions. At the same time, during the photovoltaic power generation process, when photovoltaic flashover occurs instantaneously, the fast response characteristics of the full-power variable-speed pumped storage unit are used first to instantaneously fill the load flashover, and the unfilled load is instantly supplemented by the conventional hydropower unit. When the load cannot be filled during the maintenance of the conventional hydropower unit, the chemical energy storage device is used to fill the peak.

[0070] At night, because photovoltaic power cannot generate electricity, hydropower units are used to generate electricity to pull the reservoir water level to the lowest level, and the lowest water level is maintained throughout the night. The reservoir can be adjusted to 1 to 2 meters below the dead water level during the day. During the day, when the sun comes out, the hydropower load is dynamically adjusted according to the total load requirements and the photovoltaic load. In particular, during the flood season, the maximum output of hydropower and photovoltaic power can be used as the benchmark for operation.

[0071] When the hydropower unit needs to be shut down for maintenance, the chemical energy storage device is used as the power supply for the plant; or when the hydropower unit has redundant load, the redundant power can be stored in the chemical energy storage device. For daily adjustment power stations, the utilization efficiency of water resources can be improved and the water abandonment rate of the power station can be reduced. When the power grid needs a peak load, photovoltaic, hydropower and chemical energy storage are all used as power supply equipment to generate electricity for the power grid to meet the peak load requirements.

[0072] Furthermore, if Figure 2 As shown in FIG. 1 , according to the total load requirement, the process of dynamically adjusting the hydropower load according to the photovoltaic load specifically includes:

[0073] Obtain the current reservoir inflow, power generation flow and ecological flow in real time, and determine whether load adjustment is needed based on this.

[0074] Specifically, when the inflow flow is equal to the sum of the power generation flow and the ecological flow, that is, the inflow flow is equal to the sum of the power generation flow and the ecological flow, it indicates that the reservoir flow is balanced at this time and no load adjustment is required.

[0075] When the incoming water flow is less than the sum of the power generation flow and the ecological flow, it means that the inflow is insufficient. At this time, the hydropower unit needs to be adjusted to reduce the load. Specifically, if the current water level is a dead water level, according to the current load calculation of the hydropower station, the reservoir needs to enter the limit water level operation in h hours. According to the optimal power generation efficiency of the hydropower unit and the safe and stable operation of the unit, the load of the XX unit with the best load condition will be reduced to mMW and corresponding prompts will be given. It should be noted that the load reduction adjustment can be manually adjusted by the on-duty operator or automatically adjusted by the system. It can be adjusted immediately when receiving the corresponding prompt, or it can be adjusted with a delay. In addition, the prompt will be automatically closed after the corresponding operation is performed, and will not affect the on-site monitoring.

[0076] The calculation process of the time when the reservoir enters the extreme water level operation state and the load that needs to be adjusted is as follows:

[0077]

[0078]

[0079] Where V represents the total capacity of the reservoir; V k represents the current capacity of the reservoir at time k; Q 1i represents the discharge flow at time i; Δt is the interval time; hh is the time when the current storage capacity reaches full capacity; Q f is the power generation flow; P 1i Indicates the water consumption rate at time i, which is generally a fixed value; m i is the power generation at time i.

[0080] Furthermore, when the system detects that the load of the hydropower unit has not been adjusted and the incoming water flow is less than the sum of the power generation flow and the ecological flow, the above-mentioned load reduction adjustment prompt is performed at a preset time interval (for example, once every 10 minutes).

[0081] When the inflow flow is greater than the sum of the power generation flow and the ecological flow, the downstream flow is calculated based on this. The downstream flow is equal to the difference between the inflow flow and the power generation flow and the ecological flow, expressed as:

[0082] Q1=Q0-Q f -Q s

[0083] Among them, Q1 represents the downstream flow; Q0 represents the incoming water flow; Q f Indicates the power generation flow; Q s Represents ecological flow, where the ecological flow is set according to requirements.

[0084] The downlink traffic is expressed as:

[0085] Q=CKH N

[0086] Among them, Q represents the downstream flow, which is equal to the sum of the downstream flow and the ecological flow; C represents the gate opening height; K is a constant, which depends on the unit of measurement of the flow; H represents the current power generation head; N is an index, generally between 1.5 and 2.

[0087] The relationship between reservoir capacity and time is:

[0088]

[0089] Where V represents the total capacity of the reservoir; V T represents the current capacity of the reservoir at time T; Q 1i It represents the discharge flow at time i; Δt is the interval time.

[0090] Calculate the gate opening height according to the above formula.

[0091] Therefore, when the system monitors that the incoming water flow is greater than the sum of the power generation flow and the ecological flow, that is, the current inflow into the reservoir is too large, and the hydropower unit has not yet reached the maximum load operation, it is necessary to adjust the load of the hydropower unit and give corresponding prompts. Specifically, the relevant control parameters are calculated based on the current water level and the current load of the hydropower unit, and the load is adjusted based on the relevant control parameters: the reservoir will enter the highest water level operation at T hours. According to the optimal power generation efficiency of the unit and the safe and stable operation of the unit, it is recommended to increase the load of the power station XX unit to XXMW. When the system monitors that the incoming water flow is greater than the sum of the power generation flow and the ecological flow, that is, the current inflow into the reservoir is too large, and the hydropower unit is currently operating at the highest load, it is necessary to open the gate to release the flow (that is, the gate opening value is the gate opening height calculated above) to maintain the balanced operation of the reservoir flow and give corresponding prompts.

[0092] Similarly, the above load increase adjustment or gate operation can be manually adjusted by the on-duty operator or automatically adjusted by the system. It can be adjusted immediately upon receiving the corresponding prompt or it can be adjusted with a delay. In addition, the prompt will be automatically closed after the corresponding operation is performed, without affecting the on-site monitoring.

[0093] When the system detects that the load of the hydropower station has not been adjusted and the water flow into the reservoir is greater than the sum of the power generation flow and the ecological flow, the above-mentioned load increase adjustment prompt or gate opening prompt will be given at a preset time interval (for example, once every 10 minutes).

[0094] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0095] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0098] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A hybrid variable speed pumped storage and chemical energy storage coordinated control system, characterized in that: The coordinated control system comprises: A hydroelectric generator set, the output of which is connected to the power grid through a switch; A variable speed pumped storage unit, the output of which is connected to the power grid through a switch; Photovoltaic modules, the output of which is connected to the power grid, chemical energy storage device and power plant through double-pole double-throw switches; A chemical energy storage device, which is connected to the power grid through a connecting switch, and includes at least two energy storage sections, each of which is composed of a number of batteries connected in series, and each battery is controlled by a corresponding switch to be in use; and, a monitoring device, the monitoring device being used to realize data monitoring, collection, processing and coordinated control of the entire system; Among them, during the flood season, the hydroelectric unit, variable speed pumped storage unit and photovoltaic module are used as the main power supply equipment, the hydroelectric unit is also used as the main energy storage equipment of the photovoltaic module, and the chemical energy storage device is used as the backup energy storage equipment of the photovoltaic module. When the photovoltaic module generates electricity, when photovoltaic flashover occurs, the variable speed pumped storage unit is preferentially used to respond quickly to instantaneously fill the load flashover; During the dry season, the hydropower unit, variable speed pumped storage unit, photovoltaic module and chemical energy storage device serve as the main power supply equipment, the chemical energy storage device serves as the main energy storage device of the photovoltaic module, the hydropower unit serves as the backup energy storage device of the photovoltaic module, and the variable speed pumped storage unit serves as the fast energy storage device of the photovoltaic module. When photovoltaic flashover occurs during power generation, the fast response characteristics of the variable speed pumped storage unit are preferentially used to instantaneously fill the load flashover.

2. A hybrid variable speed pumped storage and chemical energy storage coordinated control system according to claim 1, characterized in that: When the switch between the output of the photovoltaic module and the power grid is open, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, the output of the photovoltaic module first passes through the chemical energy storage device and then is sent to the power grid, thereby avoiding the impact of photovoltaic flashover on the power grid; When the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is open, the output of the photovoltaic module is directly sent to the power grid and sent out along the same line as the hydropower unit, forming a water-solar bundled delivery mode. At this time, the hydropower unit serves as the energy storage device of the photovoltaic module; When the switch between the output of the photovoltaic module and the power grid is closed, the switch between the output of the photovoltaic module and the chemical energy storage device is closed, and the output of the chemical energy storage device is closed to the switch on the power grid side, if the power grid needs a peak load, the photovoltaic module, the hydropower unit and the chemical energy storage device all serve as power supply equipment to generate electricity to the power grid; when the photovoltaic module is undergoing maintenance, the chemical energy storage device serves as a backup power supply to generate electricity to the power grid.

3. A hybrid variable speed pumped storage and chemical energy storage coordinated control system according to claim 2, characterized in that: When the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, if the hydropower unit needs to be supplied with factory power, the chemical energy storage device is used as the factory power supply; When the switch between the output of the photovoltaic module and the power grid is closed, and the switch between the output of the photovoltaic module and the chemical energy storage device is closed, if the hydropower unit has redundant load, the redundant electricity is stored in the chemical energy storage device.

4. A coordinated control method for a hybrid variable speed pumped storage and chemical energy storage coordinated control system based on any one of claims 1 to 3, characterized in that: The coordinated control method comprises: During the day, the photovoltaic module is controlled to generate electricity at full capacity, and the hydropower module is used as the main power source for photovoltaic power generation; when the water level is too high, the remaining power of the photovoltaic module is used as the power source for the plant, and the remaining photovoltaic power is stored through the chemical energy storage device, provided that the run-of-river power station does not abandon water. At night, the hydroelectric components are controlled to generate electricity at full capacity, and the chemical energy storage device is used as a factory power supply or a backup power supply to reduce the use of diesel generators.

5. The coordinated control method according to claim 4, characterized in that: During the power generation process of the photovoltaic module, when photovoltaic instantaneous flashover occurs, the fast response characteristics of the variable speed pumped storage unit are preferentially used to instantaneously fill the load flashover, and the unfilled load is instantly supplemented by the hydropower unit. When the load cannot be filled during the maintenance of the hydropower unit, the chemical energy storage device is used to fill it.

6. The coordinated control method according to claim 4, characterized in that: At night, since the photovoltaic modules cannot generate electricity, the hydropower unit is used to generate electricity to lower the reservoir water level to the lowest level, and the lowest water level operation state is maintained all night. During the day, according to the total load requirements, the load of the hydropower unit is dynamically adjusted according to the load of the photovoltaic modules.

7. The coordinated control method according to claim 6, characterized in that: The step of dynamically adjusting the load of the hydroelectric generator set according to the load of the photovoltaic module in accordance with the total load requirement specifically includes: Obtain the current reservoir water flow, power generation flow and ecological flow in real time; If the inflow flow is equal to the sum of the power generation flow and the ecological flow, it indicates that the reservoir flow is balanced and no load adjustment is performed; If the water flow is less than the sum of the power generation flow and the ecological flow, it indicates that the reservoir inflow is insufficient and the hydropower unit needs to be adjusted to reduce load; If the incoming water flow is greater than the sum of the power generation flow and the ecological flow, it indicates that the reservoir inflow is too large and the hydropower unit needs to be adjusted to increase the load or the gate needs to be opened for discharge control.

8. The coordinated control method according to claim 7, characterized in that: The load reduction adjustment process of the hydropower unit specifically includes: First, according to the current load and water level of the hydropower unit, the time when the reservoir enters the extreme water level operation state and the load that needs to be adjusted are calculated; Then, prompts are given based on the calculated parameters, and the corresponding adjustment mode is selected to perform load reduction adjustment.

9. The coordinated control method according to claim 7, characterized in that: The load adjustment process of the hydropower unit specifically includes: First, according to the current load and water level of the hydropower unit, calculate the time when the reservoir enters the highest water level operation state and the load that needs to be adjusted, or calculate the gate opening height; Then, prompts are given based on the calculated parameters, and the corresponding adjustment mode is selected to perform load increase adjustment or gate opening control.

10. The coordinated control method according to claim 9, characterized in that: The time for the reservoir to enter the highest water level operation state is calculated as follows: Where V represents the total capacity of the reservoir; V T represents the current capacity of the reservoir at time T; Q 1i represents the discharge flow at time i; Δt is the interval time; The downstream flow rate is equal to the difference between the water flow rate at the corresponding moment and the power generation flow rate and the ecological flow rate; The gate opening height is calculated as follows: Q=CKH N Among them, Q represents the downstream flow, which is equal to the sum of the downstream flow and the ecological flow; C represents the gate opening height; K is a constant, which depends on the unit of measurement of the flow; H represents the current power generation head; N is an index.

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