CN115693724B - Control method for double grid-connected mode variable speed constant frequency pumped storage power station - Google Patents
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Abstract
The invention provides a control method for a double-grid-connected mode variable-speed constant-frequency pumped storage power station, and relates to the technical field of pumped storage power stations. The method comprises the following steps: and acquiring and determining the operation mode of the target pumped storage power station according to the single-pole double-throw switch position signal. When the operation mode is the bypass mode state, the regulation control of the target pumped storage power station is completed through the monitoring system, the excitation system and the speed regulation system, wherein the monitoring system, the excitation system and the speed regulation system are regulated through pulses. When the operation mode is the converter operation mode, the rotating speed of the generator motor and the power of the water pump turbine are regulated by controlling the full-power converter. The method selects the operation mode of the target pumped storage power station through a single-pole double-throw switch. And then, according to the operation mode of the target pumped storage power station, different control schemes are selected in a targeted manner to regulate and control the target pumped storage power station, so that the safe and stable operation of the target pumped storage power station is realized, and the water discarding loss is reduced.
Description
Technical Field
The invention relates to the technical field of pumped storage power stations, in particular to a control method for a double grid-connected mode variable speed constant frequency pumped storage power station.
Background
The pumped storage unit can be divided into a constant speed unit and a variable speed unit, and the current domestic pumped storage power station mainly comprises a large constant speed unit and is mainly concentrated in a large load area for peak shaving of a main network. Because the constant-speed pumped storage unit cannot adjust the input power when the water pump is in a working condition, the requirement of the power grid for quickly and accurately adjusting the system frequency is not met. Compared with the traditional constant-speed pumped storage unit, the variable-speed pumped storage unit has the irreplaceable advantages that: the system automatic control capacity can be provided, the system is suitable for a wider water head range, the operation efficiency is improved, the high-speed adjustment of active power is realized, and the operation stability of a unit is improved; the water pump working condition starting device can be omitted, and the water pump working condition starting device can be matched with the automatic control of the frequency of the power system, so that the water pump working condition starting device can be adjusted in a large range.
The variable-speed pumped storage unit mainly realizes variable-speed control by two modes of speed regulation of a double-fed converter or speed regulation of a full-power converter, and the full-power variable-speed pumped storage unit refers to that a generator motor stator is connected with a power grid through the full-power converter and a main transformer, and the unit power is transmitted through the converter; the doubly-fed variable-speed pumped storage unit refers to a generator motor, wherein a rotor of the generator motor is connected with a power grid through a doubly-fed converter, a stator of the generator motor is connected with the power grid through a main transformer, most of power is transmitted from the stator to the main transformer, and a small part of power is transmitted through the doubly-fed converter. Besides the generator motor and the water pump turbine, the main technical difficulties of the full-power variable-speed pumped storage unit are software design, cooperative control algorithm and reliability of power elements, so that various operation indexes of the full-power variable-speed pumped storage unit are required to be checked in actual working conditions and operation time.
Disclosure of Invention
The invention aims to provide a control method for a double-grid-connected mode variable-speed constant-frequency pumped storage power station, which can be used for adjusting and controlling the target pumped storage power station by pertinently selecting different control schemes according to the operation mode of the target pumped storage power station, so that the safe and stable operation of the target pumped storage power station is realized, and the water discarding loss is reduced.
Embodiments of the present invention are implemented as follows:
the embodiment of the application provides a control method for a double grid-connected mode variable speed constant frequency pumped storage power station, which comprises the following steps:
acquiring and determining an operation mode of a target pumped storage power station according to a single-pole double-throw switch position signal;
when the operation mode is a bypass mode state, the regulation control of the target pumped storage power station is completed through a monitoring system, an excitation system and a speed regulation system, wherein the monitoring system, the excitation system and the speed regulation system are regulated through pulses;
when the operation mode is the converter operation mode, the rotating speed of the generator motor and the power of the water pump turbine are regulated by controlling the full-power converter.
In some embodiments of the present invention, when the operation mode is the converter operation mode, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full power converter includes:
when the operation mode is the converter operation mode, the method is according to the formulaThe output frequency is regulated through a full-power converter to change the rotating speed of a generator motor, and meanwhile, the opening degree of a guide vane is regulated through the regulation of the rotating kinetic energy of a rotor and a speed regulator to coordinate the power of a target pumped storage power station, wherein J T For equivalent moment of inertia, ω n Is angular velocity, Ω m For the mechanical speed of the generator rotor, P M For mechanical power, P E For electromagnetic power, K f Is the coefficient of friction.
In some embodiments of the present invention, when the operation mode is the converter operation mode, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full power converter includes:
when the target pumped storage power station is in the working condition operation process of the current transformer mode power generation, the product of the flow, the water head and the efficiency of the water turbine is in direct proportion to the output of the water turbine;
when the target pumped storage power station is in the working condition operation process of the converter mode water pump, the product of the flow rate and the lift of the water pump is in direct proportion to the input power of the water pump, and meanwhile, the input power of the water pump is in inverse proportion to the efficiency of the water pump.
In some embodiments of the present invention, the above-mentioned monitoring system adopts a layered distributed star-shaped dual-network structure, and a unit site control unit LCU of the target pumped storage power station adopts a hot standby redundancy configuration of dual CPUs;
and establishing connection between the double CPUs and the monitoring system.
In some embodiments of the present invention, when the operation mode is a converter operation mode, an adjustment instruction is issued to the full-power converter through the cooperative controller, where the cooperative controller adopts an analog quantity adjustment mode.
In some embodiments of the present invention, when the operation mode is a current transformer operation mode, the step of issuing, by the cooperative controller, a regulation command to the full-power current transformer includes:
after the monitoring system issues the adjusting instruction to the cooperative controller, the cooperative controller respectively issues the adjusting instruction to the speed regulator and the full-power converter through the AO molding module;
the speed regulator adjusts the opening of the guide vane according to the adjusting instruction so as to adjust the power of the water pump turbine;
the full-power converter sends stator voltage to the generator motor according to the regulating command, and simultaneously sends exciting voltage to the exciting system, and the exciting system sends exciting current to the generator motor according to the exciting voltage.
In some embodiments of the present invention, the control method for a dual grid-connected mode variable speed constant frequency pumped storage power station further includes:
when the target pumped storage power station is in the operation process of the current transformer mode power generation working condition, if the speed regulator controls the opening degree of the guide vane and the full-power current transformer controls the frequency, the current transformer mode power generation working condition is in a fast frequency mode, and if the speed regulator controls the frequency and the full-power current transformer controls the power, the current transformer mode power generation working condition is in a fast power mode.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a control method for a double grid-connected mode variable speed constant frequency pumped storage power station, which comprises the following steps: and acquiring and determining the operation mode of the target pumped storage power station according to the single-pole double-throw switch position signal. When the operation mode is the bypass mode state, the regulation control of the target pumped storage power station is completed through the monitoring system, the excitation system and the speed regulation system, wherein the monitoring system, the excitation system and the speed regulation system are regulated through pulses. The bypass mode can ensure the normal power generation operation of the target pumped storage power station when the full-power converter is overhauled, and the water discarding loss is reduced. When the operation mode is the converter operation mode, the rotating speed of the generator motor and the power of the water pump turbine are regulated by controlling the full-power converter. The fluctuation of photovoltaic or wind power generation can be smoothed through the operation mode of the converter, the impact of grid connection of photovoltaic or wind power generation on a power grid is reduced, and the utilization efficiency of solar energy and wind energy is improved. The method comprises the steps of selecting an operation mode of a target pumped storage power station through a single-pole double-throw switch. And then, according to the operation mode of the target pumped storage power station, different control schemes are selected in a targeted manner to regulate and control the target pumped storage power station, so that the safe and stable operation of the target pumped storage power station is realized, and the water discarding loss is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method for a variable speed constant frequency pumped storage power station in a dual grid-connected mode according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main connection of a dual grid-connected mode pumped storage unit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an adjustment provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a variable speed power generation operating mode according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of an electronic device according to an embodiment of the present invention.
Icon: 101-memory; 102-a processor; 103-communication interface.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like, if any, are used solely for distinguishing the description and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the element defined by the phrase "comprising one … …" do not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
In the description of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that the product of the application is commonly put in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.
Examples
Referring to fig. 1, fig. 1 is a flowchart of a control method for a dual grid-connected mode variable speed constant frequency pumped storage power station according to an embodiment of the present invention. The embodiment of the application provides a control method for a double grid-connected mode variable speed constant frequency pumped storage power station, which comprises the following steps:
s110: acquiring and determining an operation mode of a target pumped storage power station according to a single-pole double-throw switch position signal;
specifically, the target pumped storage power station is provided with a bypass mode and a converter mode at the same time. The bypass mode is a quasi-synchronous grid-connected mode, and the converter mode is a grid-connected mode through a full-power converter.
Referring to fig. 2, fig. 2 is a schematic diagram of a main connection of a dual-grid-connected mode pumped storage unit according to an embodiment of the present invention. The main electrical equipment of the target pumped storage power station comprises a generator motor, a bypass switch, a full-power converter, an outlet breaker, a main transformer, a generator voltage distribution device, a 35kV high-voltage device, station electrical equipment and the like. The power generation motor is provided with a single-pole double-throw switch at the outlet, and the contact a of the single-pole double-throw switch is electrically connected with an outlet breaker through a full-power converter and a separation blade 1; the b contact of the single-pole double-throw switch is directly and electrically connected with the outlet breaker through a bypass bus. The operational mode of the target pumped-storage power station can be determined based on the position of the single pole double throw switch.
S120: when the operation mode is a bypass mode state, the regulation control of the target pumped storage power station is completed through a monitoring system, an excitation system and a speed regulation system, wherein the monitoring system, the excitation system and the speed regulation system are regulated through pulses;
specifically, the bypass mode is a standby working mode and only has a constant-speed power generation function, and the main purpose is to ensure normal power generation operation of the target pumped storage power station and reduce water discarding loss when the full-power converter is overhauled. The bypass mode is additionally arranged, so that the safe and economical operation of the full-power variable-speed pumping and accumulating unit can be effectively ensured. In the bypass mode, the on-off process and the power regulation control are completed through the monitoring system, the excitation system and the speed regulating system, wherein the monitoring system, the excitation system and the speed regulating system are regulated through pulses, the speed regulator has the opening mode and the power mode, and the full-power converter and the cooperative controller are out of operation during the period.
S130: when the operation mode is the converter operation mode, the rotating speed of the generator motor and the power of the water pump turbine are regulated by controlling the full-power converter.
Specifically, the operation mode of the converter is a main operation mode of the target pumped storage power station, and the mode has two operation modes of variable-speed power generation and variable-speed pumping, so that fluctuation of photovoltaic or wind power generation can be smoothed, impact of grid connection of photovoltaic or wind power generation on a power grid can be reduced, and the utilization efficiency of solar energy and wind energy can be improved. Under the operation mode of the converter, the full-power converter is used as a starting and phase-changing device of the pumping and accumulating unit, so that the variable-frequency starting of the unit is realized, and meanwhile, the phase sequence of the unit under the power generation working condition and the water pump working condition is kept consistent with that of the electric power system.
In the implementation process, the method firstly selects the operation mode of the target pumped storage power station through a single-pole double-throw switch. And then, according to the operation mode of the target pumped storage power station, different control schemes are selected in a targeted manner to regulate and control the target pumped storage power station, so that the safe and stable operation of the target pumped storage power station is realized, and the water discarding loss is reduced.
In the bypass mode, only the bypass power generation operation mode switching control command is allowed to be generated. When the converter is in the running mode, only the control command for switching the working condition of the speed changing mode is allowed to be sent.
In some implementations of this embodiment, when the operation mode is the converter operation mode, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full power converter includes:
when the operation mode is the converter operation mode, the method is according to the formulaThe output frequency is regulated through a full-power converter to change the rotating speed of a generator motor, and meanwhile, the opening degree of a guide vane is regulated through the regulation of the rotating kinetic energy of a rotor and a speed regulator to coordinate the power of a target pumped storage power station, wherein J T For equivalent moment of inertia, ω n Is angular velocity, Ω m For the mechanical speed of the generator rotor, P M For mechanical power, P E For electromagnetic power, K f Is the coefficient of friction.
Specifically, in the running mode of the converter, the pumped storage unit realizes the adjustment of the rotation speed of the generator motor and the power of the water pump turbine by controlling the full-power converter, and the principle is as shown in the public lawAndAs shown. The full-power converter machine side is connected with the machine set stator, the grid side is connected with the power grid system, when the power requirement of the power grid changes, the machine set converter changes the rotating speed of the generator motor by adjusting the output frequency, and the coordinated power control of the variable-speed pumped storage machine set is realized by adjusting the rotating kinetic energy of the rotor and the opening degree of the guide vane by the speed regulator.
In some implementations of this embodiment, when the operation mode is the converter operation mode, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full power converter includes:
when the target pumped storage power station is in the working condition operation process of the current transformer mode power generation, the product of the flow, the water head and the efficiency of the water turbine is in direct proportion to the output of the water turbine;
when the target pumped storage power station is in the working condition operation process of the converter mode water pump, the product of the flow rate and the lift of the water pump is in direct proportion to the input power of the water pump, and meanwhile, the input power of the water pump is in inverse proportion to the efficiency of the water pump.
Specifically, when the pumped storage speed change unit is in the working condition of converter mode power generation, the output of the water turbine is in direct proportion to the product of the flow, the water head and the efficiency of the water turbine. When the efficiency of the water turbine is kept unchanged and the flow and the water head are increased or reduced, the output of the water turbine is increased or reduced correspondingly; when the flow and the water head of the water turbine are kept unchanged, the efficiency of the water turbine is increased or reduced, and the output of the water turbine is increased or reduced accordingly.
When the pumped storage speed change unit is in the working condition of the converter mode water pump, the input power of the water pump is respectively in direct proportion to the product of the flow rate and the lift of the water pump, and is in inverse proportion to the efficiency of the water pump. When the efficiency of the water pump is kept unchanged and the product of the flow and the lift is increased or reduced, the input power of the water pump is also increased or reduced; when the flow and the water head of the water pump are kept unchanged, the efficiency of the water pump is increased or reduced, and the input power of the water pump is also reduced or increased.
In some implementations of the present embodiments, the monitoring system employs a hierarchical distributed star-shaped dual-network structure, and a unit site control unit LCU of the target pumped storage power station employs a hot standby redundancy configuration of dual CPUs;
and establishing connection between the double CPUs and the monitoring system.
Specifically, in order to ensure reliable network communication between the monitoring system and important equipment such as a cooperative controller, a full-power converter, a speed regulation system, an excitation system, a protection system and the like, the monitoring system adopts a layered distributed star-shaped dual-network structure, an on-site control unit LCU of the machine adopts hot standby redundant configuration of dual CPUs, each CPU is provided with two network cards, network links of four channels between the on-site LCU of the machine and a communication object are realized, only a main network of a main CPU interacts data with the equipment, and the other three links are in a hot standby state. When the main link fails, the link is automatically switched, and the switched link immediately executes data interaction. During the period, the two sets of CPUs are communicated with the upper computer of the computer monitoring system, but only the main CPU executes the control instruction issued by the upper computer, so that the structure ensures the reliability of communication and the uniqueness of downlink information.
In some implementations of this embodiment, when the operation mode is the converter operation mode, an adjustment instruction is issued to the full-power converter through the cooperative controller, where the cooperative controller adopts an analog adjustment mode.
Specifically, the cooperative controller adopts an analog quantity adjusting mode to realize the rapidity and accuracy of a rapid power adjusting or rapid frequency adjusting process in the running mode of the converter.
In some implementations of this embodiment, when the operation mode is the converter operation mode, the step of issuing, by the cooperative controller, the adjustment command to the full-power converter includes:
after the monitoring system issues the adjusting instruction to the cooperative controller, the cooperative controller respectively issues the adjusting instruction to the speed regulator and the full-power converter through the AO molding module;
the speed regulator adjusts the opening of the guide vane according to the adjusting instruction so as to adjust the power of the water pump turbine;
the full-power converter sends stator voltage to the generator motor according to the regulating command, and simultaneously sends exciting voltage to the exciting system, and the exciting system sends exciting current to the generator motor according to the exciting voltage.
Specifically, after the monitoring system issues an instruction to the cooperative controller, the cooperative controller issues an adjusting instruction (power, rotating speed/opening degree and rotating speed) to the speed regulator through the AO molding module in a signal of 4-20 mA; and sending the adjusting instructions (power, rotating speed/opening degree and rotating speed) to the full-power converter through the AO molding module in a 4-20mA signal, and adjusting the full-power converter and the excitation system in a communication mode. In the analog quantity regulation mode, the monitoring system and each subsystem do not form a control closed loop, but the control closed loop is completed by the PID regulation function of the full-power converter, the speed regulation system or the excitation system, and the regulation schematic diagram is shown in figure 3.
In some implementations of this embodiment, the control method for a dual grid-connected mode variable speed constant frequency pumped-storage power station further includes:
when the target pumped storage power station is in the operation process of the current transformer mode power generation working condition, if the speed regulator controls the opening degree of the guide vane and the full-power current transformer controls the frequency, the current transformer mode power generation working condition is in a fast frequency mode, and if the speed regulator controls the frequency and the full-power current transformer controls the power, the current transformer mode power generation working condition is in a fast power mode.
Specifically, the power generation working condition of the converter mode adopts an operation mode of controlling the opening degree and the variable rotation speed of the guide vane, and can be divided into a fast frequency mode and a fast power mode according to different control targets of the full-power converter and the speed regulator. When the main control opening of the speed regulator and the main control frequency of the full-power converter are in a fast frequency mode, the safety, stability and reliability of the unit in the power fast response process can be ensured. When the speed regulator is used for controlling the frequency and the full-power converter is used for controlling the power, the speed regulator is in a fast power mode, hundred-millisecond response of the power can be realized, and the principle diagram of the variable-speed power generation working condition is shown in figure 4.
In some implementations of this embodiment, under converter mode water pump conditions, there are two modes, a fixed opening variable speed and a variable opening variable speed. In the water pump pumping adjustment process, the speed regulator takes the opening of the guide vane as a main control target and is the only control target, and at the moment, the speed regulator is not influenced by the assembly force and the rotating speed, and the full-power converter is used for controlling the force and the rotating speed. The pump-storage speed-changing unit cooperative controller combines the power command signal, the water head signal and the output signal of the frequency response regulator from the power grid frequency change, the pump turbine running curve parameter and calculates the optimal efficiency rotating speed value and the optimal guide vane opening value by utilizing a cooperative control mathematical model. And the cooperative controller transmits the optimized guide vane opening value to the speed regulator to control the guide vane opening of the water pump turbine, so that the guide vane opening is optimal. The full-power converter realizes that the unit power is adapted to the current total power command signal, the rotation speed command signal is compared with the actual rotation speed of the unit to act on the regulator, and the regulator controls the motor to enable the rotation speed of the unit to be adapted to the rotation speed command signal.
Referring to fig. 5, fig. 5 is a schematic block diagram of an electronic device according to an embodiment of the present application. The electronic device comprises a memory 101, a processor 102 and a communication interface 103, wherein the memory 101, the processor 102 and the communication interface 103 are electrically connected with each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory 101 may be used to store software programs and modules that are stored within the memory 101 for execution by the processor 102 to perform various functional applications and data processing. The communication interface 103 may be used for communication of signaling or data with other node devices.
The Memory 101 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.
The processor 102 may be an integrated circuit chip with signal processing capabilities. The processor 102 may be a general purpose processor including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
It will be appreciated that the configuration shown in fig. 5 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 5, or have a different configuration than shown in fig. 5. The components shown in fig. 5 may be implemented in hardware, software, or a combination thereof.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. The control method for the double grid-connected mode variable speed constant frequency pumped storage power station is characterized by comprising the following steps of:
acquiring and determining an operation mode of a target pumped storage power station according to a single-pole double-throw switch position signal;
when the operation mode is in a bypass mode state, the regulation control of the target pumped storage power station is completed through a monitoring system, an excitation system and a speed regulation system, wherein the monitoring system, the excitation system and the speed regulation system are regulated through pulses;
when the operation mode is a converter operation mode, the rotating speed of the generator motor and the power of the water pump turbine are regulated by controlling the full-power converter;
wherein;
when the operation mode is a converter operation mode, the step of adjusting the rotation speed of the generator motor and the power of the water pump turbine by controlling the full-power converter comprises the following steps:
when the operation mode is the converter operation mode, the method is according to the formulaThe output frequency is regulated through a full-power converter to change the rotating speed of a generator motor, and meanwhile, the opening degree of a guide vane is regulated through the regulation of the rotating kinetic energy of a rotor and a speed regulator to coordinate the power of a target pumped storage power station, wherein J T For equivalent moment of inertia, ω n Is angular velocity, Ω m For the mechanical speed of the generator rotor, P M For mechanical power, P E For electromagnetic power, K f Is the coefficient of friction.
2. The control method for a variable speed constant frequency pumped-hydro power plant in a dual grid-tie mode as set forth in claim 1, wherein the step of adjusting the rotational speed of the generator motor and the power of the water pump turbine by controlling the full power inverter when the operation mode is the inverter operation mode comprises:
when the target pumped storage power station is in the working condition operation process of the current transformer mode power generation, the product of the flow, the water head and the efficiency of the water turbine is in direct proportion to the output of the water turbine;
when the target pumped storage power station is in the working condition operation process of the converter mode water pump, the product of the flow rate and the lift of the water pump is in direct proportion to the input power of the water pump, and meanwhile, the input power of the water pump is in inverse proportion to the efficiency of the water pump.
3. The control method for the double grid-connected mode variable speed constant frequency pumped storage power station according to claim 1, wherein the monitoring system adopts a layered distributed star-shaped double-network structure, and a unit site control unit LCU of the target pumped storage power station adopts hot standby redundant configuration of double CPUs;
and establishing connection between the dual CPU and the monitoring system.
4. The control method for the double grid-connected mode variable speed constant frequency pumped storage power station according to claim 1, wherein when the operation mode is a converter operation mode, an adjustment command is issued to the full power converter through a cooperative controller, and the cooperative controller adopts an analog quantity adjustment mode.
5. The control method for a variable speed constant frequency pumped-storage power plant in dual grid-tie mode as set forth in claim 4, wherein when said operating mode is a converter operating mode, the step of issuing an adjustment command to said full power converter via a cooperative controller comprises:
after the monitoring system issues the adjusting instruction to the cooperative controller, the cooperative controller issues the adjusting instruction to the speed regulator and the full-power converter through an AO molding module;
the speed regulator adjusts the opening of the guide vane according to the adjusting instruction so as to adjust the power of the water pump turbine;
the full-power converter sends stator voltage to the generator motor according to the adjusting instruction, meanwhile sends exciting voltage to the exciting system, and the exciting system sends exciting current to the generator motor according to the exciting voltage.
6. The control method for a dual grid-tie mode variable speed constant frequency pumped-storage power plant of claim 1, further comprising:
when the target pumped storage power station is in the operation process of the current transformer mode power generation working condition, if the speed regulator controls the opening degree of the guide vane and the full-power current transformer controls the frequency, the current transformer mode power generation working condition is in a fast frequency mode, and if the speed regulator controls the frequency and the full-power current transformer controls the power, the current transformer mode power generation working condition is in a fast power mode.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155883A (en) * | 2014-06-12 | 2014-11-19 | 国家电网公司 | Starting control method for static frequency converter (SFC) of pump storage group |
| CN111355260A (en) * | 2020-02-11 | 2020-06-30 | 北京科诺伟业科技股份有限公司 | Full-power variable-speed reversible pumped storage unit converter power control method |
| CN112039089A (en) * | 2020-09-01 | 2020-12-04 | 国网四川省电力公司电力科学研究院 | Rapid power control and frequency oscillation suppression method for variable-speed constant-frequency pumped storage unit |
| CN114024339A (en) * | 2021-11-26 | 2022-02-08 | 国网四川省电力公司电力科学研究院 | Method for expanding full-power variable-speed pumped storage unit by utilizing cascade hydropower |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155883A (en) * | 2014-06-12 | 2014-11-19 | 国家电网公司 | Starting control method for static frequency converter (SFC) of pump storage group |
| CN111355260A (en) * | 2020-02-11 | 2020-06-30 | 北京科诺伟业科技股份有限公司 | Full-power variable-speed reversible pumped storage unit converter power control method |
| CN112039089A (en) * | 2020-09-01 | 2020-12-04 | 国网四川省电力公司电力科学研究院 | Rapid power control and frequency oscillation suppression method for variable-speed constant-frequency pumped storage unit |
| CN114024339A (en) * | 2021-11-26 | 2022-02-08 | 国网四川省电力公司电力科学研究院 | Method for expanding full-power variable-speed pumped storage unit by utilizing cascade hydropower |
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