Coordination control device and variable-speed pump turbine

Abstract

The invention provides a coordination control device and a variable-speed pump turbine. Comprising a first coordination controller which serves as a main coordination controller, receives control input information in a communication and / or hard wiring mode, and outputs a coordination instruction to an alternating current excitation system and a speed regulator system according to the control input information, so that the alternating current excitation system and the speed regulator system operate in a coordinated mode; the second coordination controller serves as a standby coordination controller and is connected with the first coordination controller, and the second coordination controller is used for tracking control state information of the first coordination controller in real time and keeping the control state information consistent with the control state of the first coordination controller, so that the second coordination controller is switched into the main coordination controller, and the second coordination controller is switched into the standby coordination controller. And when the first coordination controller is switched to the standby coordination controller, the second coordination controller can continuously calculate and output a coordination instruction based on the tracked control state information and the received control input information so as to realize undisturbed switching of coordination control.

Description

Technical Field

[0001] The present application relates to the technical field of pumped storage, and in particular to a coordinated control device and a variable speed water pump turbine. Background Art

[0002] With the development of cross-regional interconnected AC and DC power grids in my country, factors such as failures in large-capacity transmission channels and power fluctuations caused by large-scale access to new energy sources have brought new challenges to grid control measures. In particular, the periodic shortage of spare capacity in the operation of AC and DC power grids will pose a major threat to the safe and reliable operation of the power grid.

[0003] Pumped storage power stations have the functions of peak-shaving, frequency-shaving, phase-shaving and emergency standby, and are an effective means to solve the peak-shaving and safe and reliable operation of the power grid, playing an important role in the economic and stable operation of the power grid. At present, all the pumped storage units in operation are fixed-speed pumped storage units, which can only adopt the "start-full load-stop" control mode under the pump working condition, which cannot meet the requirements of the power grid for continuous, accurate and rapid adjustment of active power.

[0004] Variable speed pumped storage units have important operational advantages in the power grid. They can solve the frequency instability problem caused by the large-scale grid connection of renewable energy power generation, and the problem that fixed speed units (water pump working conditions) cannot adjust the input power. They can achieve high-speed regulation of active power through automatic frequency control and improve the frequency regulation accuracy of the power grid. At the same time, variable speed units also have a certain degree of asynchronous operation capability, and have better stable operation performance than conventional synchronous motors, which is conducive to improving the stability of the power system.

[0005] For variable speed pumped storage units or variable speed water pumps, rapid adjustment of the output / input active power on the stator side of the unit can be achieved through AC excitation control, and adjustment of the input / output mechanical power on the water pump / turbine side of the unit can be achieved through speed governor control.

[0006] However, AC excitation control belongs to fast electromagnetic control, while speed regulator control belongs to slow mechanical control. There are problems of mutual influence and coordination between AC excitation control and speed regulator control, which will directly affect the operation stability of the entire variable-speed pumped storage unit or variable-speed water pump. Therefore, it is necessary to study a device or system that can realize the coordinated control of AC excitation and speed regulator of variable-speed units, so that it can calculate and find the optimal operating point of the variable-speed unit according to the load instructions issued by the monitoring system (from the power grid dispatch), the power grid frequency adjustment needs and the current reservoir head / lift conditions, and output coordination instructions to the AC excitation and speed regulator respectively, so as to realize the rapid power adjustment of the variable-speed unit while ensuring the efficient and stable operation of the unit.

[0007] At present, the research on the coordinated control of variable-speed units mainly focuses on the implementation strategies or methods of coordinated control. For example, CN109659931A discloses a coordinated control method for variable-speed units based on a radial basis function interpolation model, which automatically calculates the optimal speed and optimal guide vane opening value of the unit according to the unit operation characteristic curve, and sends them to the AC excitation and speed governor; CN109308005A discloses a coordinated control method for variable-speed pumped-storage units based on working condition optimization, which determines the optimal speed under the current working condition based on the principle of maximum efficiency according to the comprehensive characteristic curve of the turbine; CN111555679A discloses an AC excitation variable-speed pumped-storage unit control system, in which active power control adopts AC excitation stator power control + speed limit control + auxiliary optimal speed control and speed governor optimal speed control. The active power control strategy of the unit realizes the rapid adjustment of the active power of the variable speed pumped storage unit, while preventing the unit speed from exceeding the operating range; CN112003310A relates to a coordinated control method of a speed governor and a converter during the working condition conversion process of a variable speed pumped storage unit. During the working condition conversion transition process, the speed governor and the converter are coordinated to enable the unit to achieve safe, rapid and gentle working condition conversion, and the connection between each conversion stage is smooth; CN112904721A discloses a coordinated control method of a variable speed pumped storage unit, which automatically interpolates the mechanical speed and guide vane opening corresponding to the optimal working point of efficiency through the operating head and output setting value of the variable speed pumped storage unit, thereby realizing the coordinated adjustment of the speed control system and the AC excitation system, and ensuring that the variable speed pumped storage unit operates in a high efficiency working condition area. However, technical information on the design of a coordinated controller from the perspective of device working reliability and interface flexibility and adaptability has not yet been reported.

[0008] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present application and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0009] In order to solve at least one of the above problems, the present application proposes a coordinated control device and a variable speed water pump turbine.

[0010] According to the first aspect of the present application, at least one embodiment of the present application provides a coordinated control device for a variable speed pump-turbine, comprising: a first coordinated controller, as a main coordinated controller, receiving control input information by communication and / or hard wiring, and outputting coordination instructions to an AC excitation system and a speed regulator system according to the control input information, so as to coordinate the operation of the AC excitation system and the speed regulator system, and feeding back the current coordinated control state to a monitoring system; wherein the control input information includes instructions issued by the monitoring system of the unit of the variable speed pump-turbine, feedback information on the operating state of the unit, the AC excitation system of the variable speed pump-turbine and / or the speed regulator system. Or the operating status feedback information of the speed regulator system, the head / lift signal obtained from the outside and the main switch position contact signal; a second coordination controller, as a backup coordination controller, is connected to the first coordination controller, and the second coordination controller is used to track the control status information of the first coordination controller in real time, and keep consistent with the control status of the first coordination controller, so that when the second coordination controller is switched to the main coordination controller and the first coordination controller is switched to the backup coordination controller, the second coordination controller can continue to calculate the output coordination instructions based on the tracked control status information and the received control input information to achieve disturbance-free switching of coordinated control.

[0011] For example, in some embodiments of the present application, the first coordination controller includes a first control host, the second coordination controller includes a second control host, and the first control host is connected to the second control host, wherein: the first control host is used to calculate and output the coordination instruction based on the control input information; and the second control host is used to receive control status information of the first coordination controller sent by the first control host.

[0012] For example, in some embodiments of the present application, the first control host and the second control host respectively include: an analog input interface for receiving instructions issued by the monitoring system, operating status feedback information of the unit, externally input head / lift signals, and operating status feedback information of the AC excitation system and the speed regulator system; a switch input interface for receiving instructions issued by the monitoring system, externally input main switch position contact signals, and operating status feedback information of the AC excitation system and the speed regulator system; an analog output interface for outputting the coordination instructions to the AC excitation system and the speed regulator system; a switch output interface for outputting the coordination instructions to the AC excitation system and the speed regulator system, and feeding back the current coordination control status to the monitoring system; a communication module for realizing the interaction of control status information between the first control host and the second control host; a processor for calculating and obtaining coordination instructions based on control input information; and a power supply module for supplying power to the communication module and the processor.

[0013] For example, in some embodiments of the present application, the first coordination controller also includes a first extended IO unit, and the second coordination controller also includes a second extended IO unit: the first extended IO unit is connected to the first control host, and the second extended IO unit is connected to the second control host; the first extended IO unit or the second extended IO unit is used to receive the control input information and forward it to the first control host or the second control host; the first extended IO unit or the second extended IO unit is also used to forward the coordination instructions issued by the first control host or the second control host to the AC excitation system and the speed regulator system, and feedback the current coordination control status to the monitoring system.

[0014] For example, in some embodiments of the present application, the first extended IO unit and the second extended IO unit respectively include: an analog input interface for receiving instructions issued by the monitoring system, operating status feedback information of the unit, externally input head / lift signals, and operating status feedback information of the AC excitation system and the speed regulator system; a switch input interface for receiving instructions issued by the monitoring system, externally input main switch position contact signals, and operating status feedback information of the AC excitation system and the speed regulator system; an analog output interface for outputting the coordination instructions to the AC excitation system and the speed regulator system; a switch output interface for outputting the coordination instructions to the AC excitation system and the speed regulator system, and feeding back the current coordination control status to the monitoring system; a communication module for forwarding the received control input information to the connected control host, and receiving the coordination instructions issued by the corresponding control host; a power supply module for supplying power to the communication module.

[0015] For example, in some embodiments of the present application, the first coordination controller and the second coordination controller are connected through at least two independent communication channels.

[0016] For example, in some embodiments of the present application, the power input, signal input interface and signal output interface of the first coordination controller and the second coordination controller are completely independent, and the first coordination controller and the second coordination controller have no common components.

[0017] For example, in some embodiments of the present application, when the coordination control device receives an external switching instruction: first, the second coordination controller is upgraded to an active coordination controller; and then the first coordination controller is downgraded to a standby coordination controller.

[0018] For example, in some embodiments of the present application, the coordination control device is used to determine whether to switch the first coordination controller to a backup coordination controller and switch the second coordination controller to a main coordination controller based on the operating status score values ​​of the first coordination controller and the second coordination controller: when the operating status score value of the first coordination controller is lower than the operating status score value of the second coordination controller, first upgrade the second coordination controller to the main coordination controller, and then downgrade the first coordination controller to the backup coordination controller; when the operating status score value of the first coordination controller is higher than or equal to the operating status score value of the second coordination controller, the main coordination controller and the backup coordination controller are not switched.

[0019] For example, in some embodiments of the present application, when the first coordination controller or the second coordination controller receives control input information in a hard-wired manner and outputs coordination instructions in a hard-wired manner, the first coordination controller and the second coordination controller use dual-path redundant wiring to connect the monitoring system, the AC excitation system and the speed regulator system.

[0020] For example, in some embodiments of the present application, when the first coordination controller or the second coordination controller receives control input information in a communication manner and outputs coordination instructions in a communication manner, the first coordination controller and the second coordination controller use dual-channel redundant communication to connect the monitoring system, the AC excitation system and the speed regulator system.

[0021] For example, in some embodiments of the present application, when the first coordination controller or the second coordination controller receives control input information by communication and hard wiring, and outputs coordination instructions by communication and hard wiring, the first coordination controller and the second coordination controller connect the monitoring system, the AC excitation system and the speed regulator system in the form of at least one communication and at least one hard wiring redundancy.

[0022] According to the second aspect of the present application, at least one embodiment of the present application provides a variable speed pump turbine, comprising: a coordination control device as described in any one of the first aspect; a monitoring system for issuing instructions to the coordination control device to control the coordination control device to enter, exit or switch the coordination controller; an AC excitation system for uploading operating status feedback information to the coordination control device, and receiving coordination instructions issued by the coordination control device to adjust the electromagnetic power of the variable speed unit; a speed regulator system for uploading operating status feedback information to the coordination control device, and receiving coordination instructions issued by the coordination control device to adjust the mechanical power of the variable speed unit; the coordination control device outputs coordination instructions to the AC excitation system and the speed regulator system to achieve coordinated operation of the AC excitation system and the speed regulator system.

[0023] The present application provides a coordination control device for a variable speed pump turbine, which adopts a configuration of a completely identical and completely independent one main and one standby coordination controller. The two coordination controllers have no shared components, and the controllers are 100% redundant. When a single controller fails or exits, it does not affect the operation of the variable speed pump turbine unit. In addition, the standby coordination controller tracks and synchronizes the control state and control output of the main coordination controller in real time through redundant communication, so that the main and standby coordination controllers can operate without disturbance when switching the unit. In the event of a single coordination controller failure or different degrees of abnormality / failure of the two coordination controllers, the coordination controller with the best operating state can still be selected as the main controller to take over the coordination control of the unit, thereby ensuring the safety of the unit operation to the greatest extent possible. The input and output of important control signals are doubled, reducing the possibility of misadjustment and misadjustment caused by abnormality of a single signal. By setting an extended IO unit and adopting a communication and hard wiring compatible method, the coordination control device can flexibly adapt to the different signal access requirements and access scales of different power stations (conventional pumped storage power stations or digital pumped storage power stations). The operational reliability of the variable speed unit coordination controller is guaranteed, which is beneficial to the safe and stable operation of the variable speed pumped storage unit or variable speed water pump.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By describing in detail exemplary embodiments thereof with reference to the accompanying drawings, the above and other objects, features and advantages of the present application will become more apparent. The accompanying drawings described below are only some embodiments of the present application, and are not intended to limit the present application.

[0026] Figure 1 A schematic diagram of a coordinated control device for a variable speed pump turbine is shown according to an exemplary embodiment;

[0027] Figure 2 Another embodiment of a schematic diagram showing an exemplary coordinated control device for a variable speed pump turbine is shown;

[0028] Figure 3 A communication connection diagram of a variable speed pump turbine is shown according to an exemplary embodiment. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0030] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices, etc. may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0031] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations or steps, nor do they have to be executed in the order described. For example, some operations or steps can be decomposed, and some operations or steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0032] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0033] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present application, and therefore cannot be used to limit the scope of protection of the present application.

[0034] Figure 1 A schematic diagram of a coordinated control device for a variable speed pump turbine is shown according to an exemplary embodiment.

[0035] like Figure 1 As shown, the coordinated control device for a variable speed pump turbine includes a first coordinated controller 10 and a second coordinated controller 20. The first coordinated controller 10 is a main coordinated controller, which operates in main mode, and the second coordinated controller 20 is a standby coordinated controller, which operates in standby mode.

[0036] The first coordination controller receives control input information by communication and / or hard wiring, and outputs coordination instructions to the AC excitation system and the speed regulator system according to the control input information, so as to coordinate the operation of the AC excitation system and the speed regulator system. When the first coordination controller is used as the main coordination controller, it also feeds back the current coordination control state to the monitoring system.

[0037] According to some embodiments, the control input information includes instructions issued by the monitoring system of the variable speed pump-turbine unit, feedback information on the operating status of the unit, feedback information on the operating status of the AC excitation system of the variable speed pump-turbine and / or the governor system of the variable speed pump-turbine, head / lift signals obtained from the outside, and main switch position contact signals.

[0038] Among them, the unit's operating status feedback information includes the unit's speed, guide vane opening, and unit voltage and current signals.

[0039] The second coordination controller is used to track the control status information of the first coordination controller in real time and keep consistent with the control status of the first coordination controller, so that when the second coordination controller is switched to the main coordination controller and the first coordination controller is switched to the backup coordination controller, the second coordination controller can continue to calculate the output coordination instructions based on the tracked control status information and the received control input information to achieve disturbance-free switching of coordinated control.

[0040] This application adopts a completely identical and completely independent configuration of one main and one standby coordination controller. The two coordination controllers have no shared components, achieving 100% redundancy of the controllers. When a single controller fails or exits, it does not affect the operation of the variable speed pump turbine unit. In addition, the standby coordination controller tracks and synchronizes the control state and control output of the main coordination controller in real time through redundant communication, so that the main and standby coordination controllers can operate without disturbance when switching the units.

[0041] According to an exemplary embodiment, the first coordination controller 10 includes a first control host 101, and the second coordination controller 20 includes a second control host 201. The first control host 101 is used to calculate and obtain coordination instructions according to control input information and output coordination instructions to the AC excitation system and the speed regulator system. The first control host 101 is connected to the second control host 201, and a fast communication line is set between the first control host 101 and the second control host 201 to transmit control data. The control data includes control state information.

[0042] According to some embodiments, the first coordination controller 10 is connected to the second coordination controller 20 through at least two independent communication channels. The communication line between the active coordination controller and the standby coordination controller adopts redundant multi-channel communication to ensure that the active coordination controller and the standby coordination controller can send data to each other and receive data sent by each other through any communication channel.

[0043] According to some embodiments, the first control host 101 and the second control host 201 respectively include an analog input interface (AI), a switch input interface (BI), an analog output interface (AO), a switch output interface (BO), a communication module (COM), a processor (CPU or DSP) and a power module (PWR). Among them, the analog input interface is used to receive the instructions issued by the monitoring system, the operating status feedback information of the unit, the head / lift signal input from the outside, and the operating status feedback information of the AC excitation system and the speed regulator system. The switch input interface is used to receive the instructions issued by the monitoring system, the main switch position contact signal input from the outside, and the operating status feedback information of the AC excitation system and the speed regulator system. The analog output interface is used to output coordination instructions to the AC excitation system and the speed regulator system. The switch output interface is used to output coordination instructions to the AC excitation system and the speed regulator system, and feedback the current coordination control state to the monitoring system. The communication module is used to realize the control state information interaction between the first control host 101 and the second control host 201. For example, the first control host 101 sends the control state information of the local control host to the second control host 201 through the communication module, and the second control host 201 sends the control state information of the local control host to the first control host 101 through the communication module. The processor is used to calculate and obtain the coordination instruction according to the control input information to realize the coordinated operation of the AC excitation system and the speed regulator system. The power supply module is used to supply power to the communication module and the processor.

[0044] According to the example embodiment, the hardware configurations of the active coordination controller and the standby coordination controller are completely identical, the power input and signal input / output interfaces of the coordination controllers are completely independent, and the two sets of coordination controllers have no shared components.

[0045] The active coordination controller sends the operation information, control input, control intermediate state, control state, control result and output coordination instructions to the standby coordination controller, and the standby coordination controller also sends the operation information, control input and other information to the active coordination controller. Among them, the control input includes the instructions issued by the monitoring system, such as the switching instructions.

[0046] According to some embodiments, when the control host needs to process a large number of input and output signals, an extended IO unit may be added to the first coordination controller 10 and the second coordination controller 20 respectively. Figure 2 As shown, the first coordination controller 10 further includes a first extended IO unit 102, and the second coordination controller 20 further includes a second extended IO unit 202. The first extended IO unit 102 is connected to the first control host 101, and the second extended IO unit 202 is connected to the second control host 201.

[0047] The first extended IO unit 102 or the second extended IO unit 202 receives the control input information and sends it to the first control host 101 or the second control host 201 through the communication line. The first extended IO unit 102 or the second extended IO unit 202 is used to forward the coordination instruction issued by the first control host 101 or the second control host 201 to the AC excitation system and the speed regulator system, and feedback the current coordinated control state to the monitoring system.

[0048] According to some embodiments, the extended IO unit will also send its own operation information and alarm information to the corresponding control host. The control host will also issue the operation parameters of the extended IO unit according to the operation information, so that the extended IO unit can operate according to the operation parameters.

[0049] According to some embodiments, the first extended IO unit 102 and the second extended IO unit 202 respectively include an analog input interface (AI), a switch input interface (BI), an analog output interface (AO), a switch output interface (BO), a communication module (COM) and a power module (PWR). Among them, the analog input interface is used to receive instructions from the monitoring system, feedback information on the operating status of the unit, externally input head / lift signals, and feedback information on the operating status of the AC excitation system and the speed regulator system. The switch input interface is used to receive instructions from the monitoring system, externally input main switch position contact signals, and feedback information on the operating status of the AC excitation system and the speed regulator system. The analog output interface is used to output coordination instructions to the AC excitation system and the speed regulator system. The switch output interface is used to output coordination instructions to the AC excitation system and the speed regulator system, and to feedback the current coordination control state to the monitoring system. The communication module is used to forward the received control input information to the connected control host, and receive the coordination instruction issued by the corresponding control host, for example, the first extended IO unit 102 sends the received operation status feedback information of the unit, the operation status feedback information of the AC excitation system and the operation status feedback information of the speed regulator system to the first control host 101, and receives the coordination instruction issued by the first control host 101. The power supply module is used to supply power to the communication module.

[0050] According to an example embodiment, whether the extended IO unit is configured does not affect the operation and coordinated control calculation of the control host of the coordinated controller.

[0051] This application sets an extended IO unit and adopts a communication and hard wiring compatible method so that the coordination control device can flexibly adapt to the different signal access requirements and access scales of different power stations (conventional pumped storage power stations or digital pumped storage power stations).

[0052] According to some embodiments, the master and standby states of the coordination controller can be switched manually. When the coordination control device receives an external switching instruction, the external switching instruction is sent to the master coordination controller and the standby coordination controller respectively. In addition, the second coordination controller is first upgraded to the master coordination controller, and then the first coordination controller is downgraded to the standby coordination controller. The external switching instruction can be a manual switch.

[0053] According to some embodiments, the master and backup states of the coordination controller can be automatically switched based on the operating status score values ​​of the first coordination controller and the second coordination controller. In the case where the operating status score value of the first coordination controller is lower than the operating status score value of the second coordination controller, the second coordination controller is first upgraded to the master coordination controller, and then the first coordination controller is downgraded to the backup coordination controller. In the case where the operating status score value of the first coordination controller is higher than or equal to the operating status score value of the second coordination controller, the master coordination controller and the backup coordination controller are not switched.

[0054] According to some embodiments, the coordination controller performs multi-dimensional self-checks of the device software and hardware, communication status, control input, and coordination control results in real time, and comprehensively evaluates the operation status score (0 to 100 points) of the coordination controller, as shown in Table 1 below:

[0055]

[0056] Table 1

[0057] Table 1 above lists examples of deductions that affect the operation status of the coordination controller. When the coordination controller operates normally (including the normal operation of the control host and IO unit's own hardware and software, no abnormalities in external communications, normal measurement of external input signals, and the coordination control results meet the expected calculated values), the operation score of the coordination controller is a full score of 100. When an abnormality / fault condition as shown in Table 1 occurs, the operation score will be deducted. The lowest score of 0 means that the controller has a serious fault that cannot continue to operate (the controller must exit), and the highest score of 100 means that the controller is in a completely normal working state.

[0058] In the present application, when a single coordination controller fails or two coordination controllers have different degrees of abnormality / failure, the coordination controller with the best operating status can still be selected as the main controller to take over the coordination control of the unit, thereby ensuring the safety of unit operation to the greatest extent possible.

[0059] According to some embodiments, the coordination controller uses communication and / or hard wiring to exchange information with the monitoring system, AC excitation system and speed regulator system of the unit. If both communication and hard wiring exist, the first coordination controller and the second coordination controller use at least one communication and at least one hard wiring to connect the monitoring system, AC excitation system and speed regulator system in a redundant form. And the communication method is preferentially used, and the hard wiring method is a backup method for the communication method. The present application sets up a redundant line communication method to double the input and output of important control signals, reducing the possibility of misadjustment and misadjustment due to a single signal abnormality.

[0060] According to some embodiments, when the first coordination controller or the second coordination controller receives control input information by communication and outputs coordination instructions by communication according to the control input information, that is, the first coordination controller or the second coordination controller communicates with the monitoring system, AC excitation system and speed regulator system of the unit, each coordination controller adopts a dual redundant communication channel. And, an alarm is issued if any communication is abnormal or interrupted. If the dual communication is abnormal or interrupted, it affects the operating status score of this set of controllers. For example, the dual communication abnormality includes the inconsistency of the dual input or output, and an alarm will be issued.

[0061] According to some embodiments, the communication method includes a point-to-point method or a networking method, but the present application is not limited thereto.

[0062] Similarly, when the first coordination controller or the second coordination controller only receives control input information in a hard-wired manner and outputs coordination instructions in a hard-wired manner according to the control input information, that is, the first coordination controller and the second coordination controller exchange information with the monitoring system, AC excitation system and speed regulator system of the unit in a hard-wired manner, each coordination controller adopts a dual-channel redundant hard-wired form. In addition, an alarm is issued if any communication is abnormal or interrupted. If the dual-channel communication is abnormal or interrupted, it will affect the operating status score of this set of controllers.

[0063] For example, in conventional hydropower stations, the coordination controller can use fast fieldbus or Ethernet to communicate with the monitoring system of the unit, exchange control instructions and status information, and provide two redundant communication links with the monitoring system. Optical fiber point-to-point, Ethernet or fast fieldbus can be used to communicate with the AC excitation system and speed regulator system in real time, transmit coordination control instructions to the AC excitation system / speed regulator system and receive status feedback information of the AC excitation system / speed regulator system, and also use two redundant communication links with the AC excitation system / speed regulator system. In smart (digital) hydropower stations, the coordination controller can access digital quantities through SV and Goose networking. Each coordination controller is connected to the A / B redundant dual network at the same time, and exchanges data with the unit monitoring system, AC excitation coordination and speed regulator coordination.

[0064] The present application provides a coordination control device for a variable speed pump turbine, which adopts a configuration of a completely identical and completely independent one main and one standby coordination controller. The two coordination controllers have no shared components, and 100% redundancy of the controller is achieved. When a single set of controllers fails or exits, it does not affect the operation of the variable speed pump turbine unit. By setting an extended IO unit, the coordination control device can flexibly adapt to the different signal access requirements and access scales of different power stations (conventional pumped storage power stations or digital pumped storage power stations) by using a communication and hard wiring compatible method. And the input and output of important control signals are doubled, which reduces the possibility of misadjustment and misadjustment caused by single signal abnormality. The standby coordination controller tracks and synchronizes the control state and control output of the main coordination controller in real time through redundant communication, so that the main and standby coordination controllers can operate without disturbance when switching the unit. In the event of a single set of coordination controller failure or different degrees of abnormality / failure of the two sets of coordination controllers, the coordination controller with the best operating state can still be selected as the main controller to take over the coordination control of the unit, and the safety of the unit operation can be guaranteed to the greatest extent possible. The operational reliability of the variable speed unit coordination controller is guaranteed, which is beneficial to the safe and stable operation of the variable speed pumped storage unit or variable speed water pump.

[0065] Figure 3 A communication connection diagram of a variable speed pump turbine is shown according to an exemplary embodiment.

[0066] like Figure 3 As shown, the variable speed pump turbine includes a coordination control device 301 , a monitoring system 302 , an AC excitation system 303 and a speed governor system 304 .

[0067] According to the example embodiment, the monitoring system 302 is respectively connected to the coordination controller in the coordination control device 301, and is used to issue instructions to the coordination control device to control the coordination control device to enter, exit or switch the coordination controller;

[0068] The AC excitation system 303 is respectively connected to the coordination controller in the coordination control device 301, and is used to upload the operation status feedback information to the coordination control device, and receive the coordination command issued by the coordination control device to adjust the electromagnetic power of the variable speed unit;

[0069] The speed regulator system 304 is respectively connected to the coordination controller in the coordination control device 301, and is used to upload the operation status feedback information to the coordination control device, and receive the coordination command issued by the coordination control device to adjust the mechanical power of the variable speed unit;

[0070] The coordination control device outputs coordination instructions to the AC excitation system and the speed regulator system to achieve coordinated operation of the AC excitation system and the speed regulator system.

[0071] The coordination control device 301 is used to execute the coordination control method as described above, so the operation method of the coordination control device will not be described in detail here.

[0072] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in the present application, these principles can be applied to many other embodiments.

[0073] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0074] The exemplary embodiments of the present application are specifically shown and described above. It should be understood that the present application is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present application is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A coordinated control device for a variable speed pump turbine, It is characterized in that include: The first coordination controller, as a main coordination controller, receives control input information by communication and / or hard wiring, and outputs coordination instructions to the AC excitation system and the speed governor system according to the control input information, so as to coordinate the operation of the AC excitation system and the speed governor system, and feeds back the current coordination control state to the monitoring system; wherein the control input information includes instructions issued by the monitoring system of the variable speed pump-turbine unit, feedback information on the operation state of the unit, feedback information on the operation state of the AC excitation system and / or the speed governor system of the variable speed pump-turbine, and head / lift signals and main switch position contact signals obtained from the outside; The second coordination controller, as a backup coordination controller, is connected to the first coordination controller. The second coordination controller is used to track the control status information of the first coordination controller in real time and keep consistent with the control status of the first coordination controller, so that when the second coordination controller is switched to the main coordination controller and the first coordination controller is switched to the backup coordination controller, the second coordination controller can continuously calculate the output coordination instructions based on the tracked control status information and the received control input information to achieve disturbance-free switching of coordinated control.

2. The coordinated control device according to claim 1, It is characterized in that The first coordination controller includes a first control host, the second coordination controller includes a second control host, the first control host is connected to the second control host, wherein: The first control host is used to calculate and output the coordination instruction according to the control input information; The second control host is used to receive the control state information of the first coordination controller sent by the first control host.

3. The coordinated control device according to claim 2, It is characterized in that The first control host and the second control host respectively include: Analog input interface, used to receive instructions issued by the monitoring system, feedback information on the operating status of the unit, externally input head / lift signals, and feedback information on the operating status of the AC excitation system and the speed regulator system; A switch input interface, used to receive instructions from the monitoring system, external input main switch position contact signals, and operating status feedback information of the AC excitation system and the speed regulator system; An analog output interface, used for outputting the coordination instruction to the AC excitation system and the speed regulator system; A switch output interface, used to output the coordination instruction to the AC excitation system and the speed regulator system, and to feed back the current coordination control state to the monitoring system; A communication module, used to realize the exchange of control status information between the first control host and the second control host; A processor, used for calculating and obtaining coordination instructions according to control input information; A power module is used to supply power to the communication module and the processor.

4. The coordinated control device according to claim 2, It is characterized in that The first coordination controller further includes a first extended IO unit, and the second coordination controller further includes a second extended IO unit: The first extended IO unit is connected to the first control host, and the second extended IO unit is connected to the second control host; The first extended IO unit or the second extended IO unit is used to receive the control input information and forward it to the first control host or the second control host; The first extended IO unit or the second extended IO unit is also used to forward the coordination instructions issued by the first control host or the second control host to the AC excitation system and the speed regulator system, and feedback the current coordination control status to the monitoring system.

5. The coordinated control device according to claim 4, It is characterized in that The first extended IO unit and the second extended IO unit respectively include: Analog input interface, used to receive instructions issued by the monitoring system, feedback information on the operating status of the unit, externally input head / lift signals, and feedback information on the operating status of the AC excitation system and the speed regulator system; A switch input interface, used to receive instructions from the monitoring system, external input main switch position contact signals, and operating status feedback information of the AC excitation system and the speed regulator system; An analog output interface, used for outputting the coordination instruction to the AC excitation system and the speed regulator system; A switch output interface, used to output the coordination instruction to the AC excitation system and the speed regulator system, and to feed back the current coordination control state to the monitoring system; The communication module is used to forward the received control input information to the connected control host and receive the coordination instructions issued by the corresponding control host; A power module is used to supply power to the communication module.

6. The coordinated control device according to claim 1, It is characterized in that The first coordination controller is connected to the second coordination controller via at least two independent communication channels.

7. The coordinated control device according to claim 1, It is characterized in that The power input interface, signal input interface and signal output interface of the first coordination controller and the second coordination controller are completely independent, and the first coordination controller and the second coordination controller have no common components.

8. The coordinated control device according to claim 1, It is characterized in that When the coordination control device receives an external switching instruction: First, upgrade the second coordination controller to the main coordination controller; Then the first coordinating controller is downgraded to a standby coordinating controller.

9. The coordinated control device according to claim 1, It is characterized in that The coordination control device is used to determine whether to switch the first coordination controller to a standby coordination controller and switch the second coordination controller to a main coordination controller according to the operation status score values ​​of the first coordination controller and the second coordination controller: When the running status score value of the first coordination controller is lower than the running status score value of the second coordination controller, the second coordination controller is first upgraded to the main coordination controller, and then the first coordination controller is downgraded to the standby coordination controller; When the running status score value of the first coordinating controller is higher than or equal to the running status score value of the second coordinating controller, the active coordinating controller and the standby coordinating controller are not switched.

10. The coordinated control device according to claim 1, It is characterized in that When the first coordination controller or the second coordination controller receives control input information in a hard-wired manner and outputs coordination instructions in a hard-wired manner, the first coordination controller and the second coordination controller use dual-path redundant wiring to connect the monitoring system, the AC excitation system and the speed regulator system.

11. The coordinated control device according to claim 1, It is characterized in that When the first coordination controller or the second coordination controller receives control input information in a communication manner and outputs coordination instructions in a communication manner, the first coordination controller and the second coordination controller use dual-channel redundant communication to connect the monitoring system, the AC excitation system and the speed regulator system.

12. The coordinated control device according to claim 1, It is characterized in that When the first coordination controller or the second coordination controller receives control input information by communication and hard wiring, and outputs coordination instructions by communication and hard wiring, the first coordination controller and the second coordination controller connect the monitoring system, the AC excitation system and the speed regulator system in the form of at least one communication and at least one hard wiring redundancy.

13. A variable speed pump turbine, It is characterized in that include: The coordinated control device according to any one of claims 1 to 12; A monitoring system, used to send instructions to the coordination control device to control the coordination control device to enter, exit or switch the coordination controller; An AC excitation system, used to upload operating status feedback information to the coordination control device, and receive coordination instructions issued by the coordination control device to adjust the electromagnetic power of the variable speed unit; A speed regulator system, used to upload operating status feedback information to the coordination control device, and receive coordination instructions issued by the coordination control device to adjust the mechanical power of the variable speed unit; The coordination control device outputs coordination instructions to the AC excitation system and the speed regulator system to achieve coordinated operation of the AC excitation system and the speed regulator system.

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