CN115693724A - Control method for double-grid-connected mode variable-speed constant-frequency pumped storage power station - Google Patents
Control method for double-grid-connected mode variable-speed constant-frequency pumped storage power station Download PDFInfo
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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 position signal of the single-pole double-throw switch. And when the operation mode is a bypass mode state, completing the adjustment control of the target pumped storage power station 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 adjusted 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 adjusted by controlling the full-power converter. The method selects the operation mode of the target pumped storage power station through the 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 adjust 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 loss of abandoned water 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 two types of constant speed units and variable speed units, and at present, domestic pumped storage power stations mainly use large constant speed units, mainly concentrate on a large load area and are used for peak shaving of a main network. The constant-speed pumped storage unit cannot adjust input power when the water pump works, and does not meet the requirement that the power grid can quickly and accurately adjust the system frequency. Compared with the traditional constant-speed pumped-storage unit, the variable-speed pumped-storage unit has the irreplaceable advantages that: the capacity of the system can be automatically controlled, 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 frequency of the power system can be automatically controlled in a matched mode, 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 double-fed converter speed regulation or full-power converter speed regulation, the full-power variable-speed pumped storage unit means that a stator of a generator motor is connected with a power grid through a full-power converter and a main transformer, and the power of the unit is transmitted through the converter; the double-fed variable-speed pumped storage unit is characterized in that a rotor of a generator motor is connected with a power grid through a double-fed converter, a stator is connected with the power grid through a main transformer, most of power is transmitted to the main transformer through the stator, and less of power is transmitted through the double-fed converter. Except for a generator motor and a water pump and a water turbine, the main technical difficulty of the full-power variable-speed pumped storage unit is software design, a cooperative control algorithm and the reliability of a power element, so that various operation indexes of the full-power variable-speed pumped storage unit need to be tested under 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 adjust and control a target pumped storage power station by selecting different control schemes according to the operation mode of the target pumped storage power station, realizes safe and stable operation of the target pumped storage power station and reduces water loss.
The embodiment of the invention is realized by the following steps:
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 the operation mode of a target pumped storage power station according to the position signal of the single-pole double-throw switch;
when the operation mode is a bypass mode state, completing the regulation control of the target pumped storage power station 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 adjusted by controlling the full-power converter.
In some embodiments of the present invention, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full-power converter when the operation mode is the converter operation mode includes:
when the operation mode is the converter operation mode, according to the formula
Adjusting the output frequency through a full-power converter to change the rotating speed of a generator motor, and adjusting the opening of a guide vane through the adjustment 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 Is equivalent rotational inertia of the unit, omega n Is angular velocity, omega m Mechanical speed of generator rotor, P M Is mechanical power, P E Is electromagnetic power, K f Is the coefficient of friction.
In some embodiments of the present invention, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full-power converter when the operation mode is the converter operation mode includes:
when the target pumped storage power station is in the working condition of converter mode power generation and in the running process, 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 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 monitoring system adopts a layered distributed star dual-network structure, and the unit local control unit LCU of the target pumped storage power station adopts a hot standby redundancy configuration with dual CPUs;
and establishing the connection between the double CPUs and the monitoring system.
In some embodiments of the present invention, when the operation mode is the converter operation mode, the cooperative controller issues the adjustment instruction to the full-power converter, where the cooperative controller adopts an analog quantity adjustment manner.
In some embodiments of the present invention, the step of issuing a regulation command to the full-power converter through the cooperative controller when the operation mode is the converter operation mode includes:
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 the AO module;
the speed regulator regulates the opening of the guide vane according to the regulating instruction so as to regulate the power of the water pump turbine;
the full-power converter sends stator voltage to the generator motor according to the adjusting instruction, simultaneously sends excitation voltage to the excitation system, and the excitation system sends excitation current to the generator motor according to the excitation 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 a target pumped storage power station is in the operation process of the converter mode power generation working condition, if the speed governor controls the opening of the guide vane and the full-power converter controls the frequency, the converter mode power generation working condition is a fast frequency mode, and if the speed governor controls the frequency and the full-power converter controls the power, the converter mode power generation working condition is 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 of: and acquiring and determining the operation mode of the target pumped storage power station according to the position signal of the single-pole double-throw switch. And when the operation mode is in a bypass mode state, completing the regulation control of the target pumped storage power station 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. The bypass mode can ensure normal power generation operation of the target pumped storage power station when the full-power converter is overhauled, and the loss of abandoned water 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 adjusted 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 the 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 firstly 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 adjust 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 loss of abandoned water is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
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;
fig. 2 is a schematic diagram of a main connection of a pumped storage unit in a dual grid-connected mode 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 operation according to an embodiment of the present invention;
fig. 5 is a schematic structural block diagram of an electronic device according to an embodiment of the present invention.
Icon: 101-a memory; 102-a processor; 103-communication interface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 presence of an element defined by the phrase "comprising a … …" does not preclude the presence of additional like 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", etc. are used to indicate an orientation or positional relationship based on that shown in the drawings or that the application product is usually placed in use, the description is merely for convenience and simplicity, and it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Examples
Referring to fig. 1, fig. 1 is a flowchart illustrating 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 the operation mode of a target pumped storage power station according to the position signal of the single-pole double-throw switch;
specifically, the target pumped-storage power station has both a bypass mode and a converter mode. The bypass mode is a quasi-synchronization grid-connected mode, and the converter mode is a full-power converter grid-connected mode.
Referring to fig. 2, fig. 2 is a schematic diagram of a main connection of a pumped-storage unit in a dual grid-connected mode 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 circuit breaker, a main transformer, a generator electric distribution device, a 35kV high-voltage device, auxiliary electrical equipment and the like. The outlet of the generator motor is provided with a single-pole double-throw switch, and a contact a of the single-pole double-throw switch is electrically connected with an outlet circuit 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 operating mode of the target pumped-storage power plant can be determined based on the position of the single pole double throw switch.
S120: when the operation mode is a bypass mode state, completing the regulation control of the target pumped storage power station 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, only has a constant-speed power generation function, and mainly aims to ensure normal power generation operation of a target pumped storage power station and reduce water loss when the full-power converter is overhauled. The bypass mode is additionally arranged, so that the safe and economic operation of the full-power variable-speed pumping and storage unit can be effectively guaranteed. Under the bypass mode, the monitoring system, the excitation system and the speed regulating system are used for completing the startup and shutdown process and power regulation and control, wherein the monitoring system, the excitation system and the speed regulating system are regulated through pulses, the speed regulator has two control functions of an opening degree mode and a power mode, and the full-power converter and the cooperative controller quit working in 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 adjusted by controlling the full-power converter.
Specifically, the converter operation mode is a main operation mode of a target pumped storage power station, and the converter operation mode has two operation modes of variable-speed power generation and variable-speed water pumping under the mode, so that fluctuation of photovoltaic or wind power generation can be smoothed, impact of photovoltaic or wind power generation grid connection on a power grid is reduced, and utilization efficiency of solar energy and wind energy is improved. Under the converter operating mode, the full-power converter is used as a pumping and storage unit starting and phase-changing device, so that the variable-frequency starting of the unit is realized, and the phase sequence of the unit is kept consistent with that of the power system under the unit power generation working condition and the water pump working condition.
In the implementation process, the method firstly selects the operation mode of the target pumped storage power station through the 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 adjust 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 loss of abandoned water is reduced.
It should be noted that, in the bypass mode, only the bypass power generation condition switching control command is allowed to be generated. And when the converter is in the running mode, only allowing to send a speed change mode working condition conversion control command.
In some embodiments of this embodiment, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full-power converter when the operation mode is the converter operation mode includes:
when the operation mode is the converter operation mode, according to the formula
Adjusting output frequency through a full-power converter to change the rotating speed of a generator motor, and adjusting the opening degree of a guide vane through adjustment of rotor rotation kinetic energy and a speed regulator to coordinate the power of a target pumped storage power station, wherein J T Is equivalent rotational inertia of the unit, omega n Is angular velocity, omega m Mechanical speed of generator rotor, P M Is mechanical power, P E Is electromagnetic power, K f Is the coefficient of friction.
Specifically, in the converter operation mode, the pumped storage unit realizes the regulation of the rotating speed of the generator motor and the power of the water pump and the water turbine by controlling the full-power converter according to the principle of a formula
As shown. The machine side of the full-power converter is connected with the machine set stator, the network side is connected with a 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 embodiments of this embodiment, the step of adjusting the rotation speed of the generator motor and the power of the pump turbine by controlling the full-power converter when the operation mode is the converter operation mode includes:
when the target pumped storage power station is in the operation process of the converter mode power generation working condition, 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 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 variable speed unit is in the operation process of the converter mode power generation working condition, 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 of the water turbine are increased or reduced, the output of the water turbine is increased or reduced along with the flow and the water head of the water turbine; when the flow rate and the water head of the water turbine are kept unchanged, and the efficiency of the water turbine is increased or reduced, the output of the water turbine is increased or reduced along with the efficiency of the water turbine.
When the pumped storage variable speed 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 and the lift of the water pump and 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 of the water pump is increased or reduced, the input power of the water pump is increased or reduced; when the flow and the water head of the water pump are kept unchanged, and the efficiency of the water pump is increased or reduced, the input power of the water pump is reduced or increased.
In some embodiments of this embodiment, the monitoring system adopts a hierarchical distributed star-shaped dual-network structure, and the unit local control unit LCU of the target pumped storage power station adopts a hot standby redundant configuration with dual CPUs;
and establishing the connection between the double CPUs and the monitoring system.
Specifically, in order to ensure reliable network communication between a 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 double-network structure, a unit Local Control Unit (LCU) adopts hot standby redundant configuration of double CPUs, each CPU is provided with two network cards, network links of four channels are formed between the unit local LCU and a communication object, only a main network of a main CPU performs data interaction with the equipment, and the rest links are in a hot standby state. When the main link fails, the link switching is automatically carried out, and the switched link immediately carries out the interaction of data. In 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 not only ensures the reliability of communication, but also ensures the uniqueness of downlink information.
In some embodiments of this embodiment, when the operation mode is the converter operation mode, the coordinated controller issues an adjustment instruction to the full-power converter, where the coordinated controller adopts an analog adjustment mode.
Specifically, the cooperative controller can realize rapidity and accuracy of a rapid power regulation or rapid frequency regulation process in a converter operation mode by adopting an analog quantity regulation mode.
In some embodiments of this embodiment, the step of issuing a regulation command to the full-power converter through the cooperative controller when the operation mode is the converter operation mode includes:
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 the AO module;
the speed regulator regulates the opening of the guide vane according to the regulating instruction so as to regulate the power of the water pump turbine;
the full-power converter sends stator voltage to the generator motor according to the adjusting instruction, simultaneously sends excitation voltage to the excitation system, and the excitation system sends excitation current to the generator motor according to the excitation voltage.
Specifically, after the monitoring system sends the instruction to the cooperative controller, the cooperative controller sends the regulation instruction (power, rotating speed/opening degree and rotating speed) to the speed regulator through an AO module and a 4-20mA signal; and sending an adjusting instruction (power, rotating speed/opening degree and rotating speed) to the full-power converter by an AO (analog-to-digital) module in a 4-20mA signal, and adjusting the full-power converter and an excitation system in a communication mode. In the analog quantity adjusting mode, the monitoring system and each subsystem do not form a control closed loop, but the control closed loop is completed by the PID adjusting function of the full-power converter, the speed adjusting system or the excitation system, and the adjusting schematic diagram is shown in fig. 3.
In some embodiments 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 converter mode power generation working condition, if the speed regulator controls the opening of the guide vane and the full-power converter controls the frequency, the converter mode power generation working condition is a fast frequency mode, and if the speed regulator controls the frequency and the full-power converter controls the power, the converter mode power generation working condition is a fast power mode.
Specifically, the converter mode power generation working condition adopts an operation mode of variable guide vane opening and variable rotating speed control, 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 master control opening of the speed regulator and the master 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 main control frequency of the speed regulator and the main control power of the full-power converter are in a fast power mode, hundred-millisecond response of the power can be realized, and a schematic diagram of the variable-speed power generation working condition is shown in fig. 4.
In some embodiments of the present invention, under the converter mode water pump condition, there are two modes of constant opening degree variable speed and variable opening degree variable speed. In the water pumping adjustment process of the water pump, the speed regulator takes the opening degree of the guide vane as a main control target and is the only control target, and the speed regulator is not influenced by the input force and the rotating speed of the unit and controls the input force and the rotating speed through the full-power converter. The cooperative controller of the pumped storage variable speed unit calculates the optimal efficiency rotating speed value and the optimal guide vane opening value by combining the power command signal, the water head signal and the output signal of the power grid frequency change through the frequency response regulator with the operation curve parameters of the water pump turbine and 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 power of the unit is adaptive to the current total power command signal, the rotating speed command signal is compared with the actual rotating speed of the unit and acts on the regulator, and the regulator controls the motor to enable the rotating speed of the unit to be adaptive to the rotating speed command signal.
Referring to fig. 5, fig. 5 is a schematic structural block diagram of an electronic device according to an embodiment of the present disclosure. 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 to 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, and the processor 102 executes various functional applications and data processing by executing the software programs and modules stored in the memory 101. The communication interface 103 may be used for communicating signaling or data with other node devices.
The Memory 101 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The processor 102 may be an integrated circuit chip having signal processing capabilities. The Processor 102 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) 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 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 ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart 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, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent 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 or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to 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), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall 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 attributes 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 (7)
1. A control method for a double-grid-connected mode variable-speed constant-frequency pumped storage power station is characterized by comprising the following steps of:
acquiring and determining the operation mode of a target pumped storage power station according to the position signal of the single-pole double-throw switch;
when the operation mode is a bypass mode state, completing the regulation control of the target pumped storage power station 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;
and 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 adjusted by controlling the full-power converter.
2. The control method for a dual grid tie mode variable speed constant frequency pumped hydro power plant of claim 1 wherein the step of adjusting the speed of the generator motor and the power of the pump turbine by controlling the full power converter when the operating mode is the converter operating mode comprises:
when the operation mode is the converter operation mode, according to a formula
Adjusting output frequency through a full-power converter to change the rotating speed of a generator motor, and adjusting the opening degree of a guide vane through adjustment of rotor rotation kinetic energy and a speed regulator to coordinate the power of a target pumped storage power station, wherein J T Is equivalent rotational inertia of the unit, omega n Is angular velocity, Ω m Mechanical speed of generator rotor, P M Is mechanical power, P E Is electromagnetic power, K f Is the coefficient of friction.
3. The control method for a dual grid tie mode variable speed constant frequency pumped hydro power plant of claim 1 wherein the step of adjusting the speed of the generator motor and the power of the pump turbine by controlling the full power converter when the operating mode is the converter operating mode comprises:
when the target pumped storage power station is in the operation process of the converter mode power generation working condition, 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 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.
4. The control method for the dual grid-connected mode variable speed constant frequency pumped-storage power station as claimed in claim 1, wherein the monitoring system adopts a layered distributed star dual network structure, and the unit local control unit LCU of the target pumped-storage power station adopts a hot standby redundant configuration of dual CPUs;
and establishing the connection between the double CPUs and the monitoring system.
5. The control method for a dual grid-connected mode variable speed constant frequency pumped-storage power plant as claimed in claim 2, wherein when the operation mode is a converter operation mode, a regulation instruction is issued to the full power converter through a cooperative controller, wherein the cooperative controller adopts an analog quantity regulation mode.
6. The control method for a dual grid-tied mode variable speed constant frequency pumped-storage power plant as claimed in claim 5, wherein when the operation mode is a converter operation mode, the step of issuing a regulation command to the full power converter through the coordinated controller comprises:
after the monitoring system issues a regulating instruction to the cooperative controller, the cooperative controller issues the regulating instruction to the speed regulator and the full-power converter respectively through an AO module;
the speed regulator regulates the opening of the guide vane according to the regulating instruction so as to regulate the power of the water pump turbine;
and the full-power converter sends stator voltage to the generator motor according to the adjusting instruction, simultaneously sends excitation voltage to the excitation system, and the excitation system sends excitation current to the generator motor according to the excitation voltage.
7. The control method for a dual grid tie mode variable speed constant frequency pumped-hydro energy storage plant as claimed in claim 2, further comprising:
when a target pumped storage power station is in the operation process of a converter mode power generation working condition, if the speed regulator controls the opening of the guide vane and the full-power converter controls the frequency, the converter mode power generation working condition is a fast frequency mode, and if the speed regulator controls the frequency and the full-power converter controls the power, the converter mode power generation working condition is a fast power mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118100317A (en) * | 2024-04-23 | 2024-05-28 | 南方电网调峰调频发电有限公司储能科研院 | Double-fed variable-speed pumped storage unit cooperative control system and control method thereof |
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| 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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| 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 |
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