Hydropower generator speed signal processing device

Abstract

This invention provides a hydro-generator speed signal processing device, relating to the field of hydropower station monitoring technology. The device includes a switch signal input module, an analog signal input module, and a signal processing module. The switch signal input module acquires the switch signals of the hydro-generator, while the analog signal input module acquires the analog speed signals. The signal processing module performs operational monitoring based on the switch signals and the analog speed signals, enabling real-time monitoring of the actual speed and status of the hydro-generator. Furthermore, the signal processing module can also implement emergency shutdown based on the switch signals and the analog speed signals. Compared to existing technologies, this invention adds switch signals as a reference factor for operational monitoring and emergency shutdown, making monitoring and shutdown more standardized, expanding the judgment range, enriching the judgment conditions, and improving the safety and reliability of the hydro-generator.

Description

Technical Field

[0001] This invention relates to the field of hydropower station monitoring technology, and more specifically, to a hydro-generator speed signal processing device. Background Technology

[0002] Rotational speed is a crucial signal for hydro-generators, serving as an important criterion for judgment under various operating conditions, including start-up, shutdown, normal operation, and emergency shutdown. According to relevant regulations, hydro-generators should be equipped with hydraulic machinery fault protection and emergency shutdown mechanisms in case of electrical overspeed.

[0003] The commonly used hydro-generator speed signal devices currently have the following shortcomings: they only realize the discrimination of speed signals, that is, they only use analog signals for discrimination. They cannot combine the discrimination with situations such as the main pressure distribution valve failing to operate and the guide vane opening being above the no-load degree. The discrimination conditions are too simple and the safety and reliability are poor. Summary of the Invention

[0004] The present invention aims to provide, for example, a hydro-generator speed signal processing device that can combine switching signals and analog signals to achieve operation monitoring and emergency shutdown of the hydro-generator, effectively ensuring the safe operation of the hydro-generator.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a hydro-generator speed signal processing device, comprising:

[0007] A switch signal input module used to acquire switch signals;

[0008] Analog signal input module for acquiring analog speed signals;

[0009] A signal processing module is communicatively connected to both the switch signal input module and the analog signal input module. The signal processing module is used to perform operation monitoring based on the switch signal and the speed analog signal, and to perform emergency shutdown based on the switch signal and the analog signal.

[0010] In an optional embodiment, the hydro-generator speed signal processing device further includes a voltage transformer signal input module, which is communicatively connected to the signal processing module and is used to acquire the voltage transformer signal at the generator terminal and to employ signal filtering and isolation measures.

[0011] In an optional implementation, the switching signal includes a failure-to-operate switching signal for characterizing whether the hydro-generator meets the requirement of the main pressure regulating valve failing to operate, and an opening switching signal for characterizing whether the hydro-generator meets the requirement of the guide vane opening degree above the no-load opening degree. The switching signal input module is used to acquire the failure-to-operate switching signal and the opening switching signal, and to employ signal filtering and isolation measures.

[0012] In an optional implementation, the analog signal includes a rotational speed signal characterizing the rotational speed of the gear disk of the hydro-generator, and the analog signal input module is used to acquire the rotational speed signal and employ signal filtering and isolation measures.

[0013] In an optional implementation, the signal processing module is used to generate an analog speed signal, a speed switch signal, an electrical overspeed switch signal, and a comprehensive switch signal based on the speed signal, the voltage inductance signal, the failure to operate switch signal, and the opening switch signal. The comprehensive switch signal is used to characterize that the speed of the hydro-generator is greater than or equal to a preset speed, the main pressure distribution valve fails to operate, and the guide vane opening is above the no-load opening.

[0014] In an optional embodiment, the hydro-generator speed signal processing device further includes an analog signal output module that is communicatively connected to the signal processing module. The analog signal output module is used to output the speed analog signal to achieve operation monitoring.

[0015] In an optional embodiment, the hydro-generator speed signal processing device further includes a switch signal output module that is communicatively connected to the signal processing module. The switch signal output module is used to output a speed switch signal to achieve operation monitoring; and the switch signal output module is also used to output the electrical overspeed switch signal and the comprehensive switch signal to achieve emergency shutdown.

[0016] In an optional implementation, the integrated switching signal is used to characterize that the speed of the hydro-generator is greater than or equal to 110% of the rated speed, the main pressure distribution valve fails to operate, and the guide vane is open above the no-load opening degree.

[0017] In an optional embodiment, the turbine generator speed signal processing device further includes a communication module, which has a communication interface that is connected to the signal processing module for uploading the speed signal to the hydropower station monitoring system.

[0018] In an optional embodiment, the hydro-generator speed signal processing device further includes a power supply module electrically connected to the signal processing module, the digital signal input module, the analog signal input module, the voltage inductance signal input module, the digital signal output module, the analog signal output module, and the communication module. The power supply module is used to provide power.

[0019] The beneficial effects of the embodiments of the present invention include, for example:

[0020] The hydro-generator speed signal processing device provided in this embodiment of the invention acquires relevant switching signals of the hydro-generator through a switch signal input module and analog signal input module to acquire relevant simulated speed signals of the hydro-generator. The signal processing module performs operation monitoring based on the switching signals and simulated speed signals, and monitors the actual speed and status of the hydro-generator in real time. At the same time, the signal processing module can also perform emergency shutdown based on the switching signals and simulated speed signals. Compared with the prior art, this invention adds the switching signal as a reference factor for operation monitoring and emergency shutdown, making monitoring and shutdown more standardized, expanding the judgment range, enriching the judgment conditions, and improving the safety and reliability of the hydro-generator. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The structural block diagram of the hydro-generator speed signal processing device provided by the present invention.

[0023] Icons: 100 - Hydropower generator speed signal processing device; 110 - Digital signal input module; 120 - Analog signal input module; 130 - Signal processing module; 140 - Voltage transformer signal input module; 150 - Digital signal output module; 160 - Analog signal output module; 170 - Communication module; 180 - Power supply module. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other. Specific Implementation

[0029] See Figure 1 This embodiment provides a hydro-generator speed signal processing device 100, which can be used for hydro-generator speed signal measurement and output. It can distinguish multiple signals, not only to distinguish the speed signal, but also to jointly distinguish multiple shutdown conditions, which greatly improves the safety and reliability of hydro-generator operation.

[0030] The hydro-generator speed signal processing device 100 provided in this embodiment includes a digital signal input module 110, an analog signal input module 120, a signal processing module 130, a voltage inductance signal input module 140, a digital signal output module 150, an analog signal output module 160, and a communication module 170. The digital signal input module 110 is used to acquire switching signals, and the analog signal input module 120 is used to acquire analog speed signals. The signal processing module 130 is communicatively connected to both the digital signal input module 110 and the analog signal input module 120, and is used to perform operation monitoring based on the switching signals and the analog speed signals, and to perform emergency shutdown based on the switching signals and the analog signals. The voltage transformer signal input module 140 is communicatively connected to the signal processing module 130. The voltage transformer signal input module 140 is used to acquire the signal of the machine terminal voltage transformer. The switch signal output module 150 and the analog signal output module 160 are both communicatively connected to the signal processing module 130. At the same time, the communication module 170 is communicatively connected to the signal processing module 130.

[0031] In this embodiment, the hydro-generator speed signal processing device 100 further includes a power supply module 180 electrically connected to the signal processing module 130, the digital signal input module 110, the analog signal input module 120, the voltage inductance signal input module 140, the digital signal output module 150, the analog signal output module 160, and the communication module 170. The power supply module 180 adopts a dual AC / DC 220V power input to convert AC / DC 220V to DC 12V to power each module.

[0032] In this embodiment, the switching signals include a failure-to-operate switching signal indicating whether the turbine generator meets the requirement of the main pressure regulating valve failing to operate, and an opening switching signal indicating whether the turbine generator meets the requirement of the guide vane opening degree above the no-load opening degree. The switching signal input module 110 is used to acquire the failure-to-operate switching signal and the opening switching signal, and employs signal filtering and isolation measures. Specifically, the switching signal input module 110 is communicatively connected to the turbine generator, and is used to acquire the main pressure regulating valve failure-to-operate signal and the guide vane opening degree above the no-load opening degree signal, and employs signal filtering and isolation measures to ensure signal accuracy and isolation of external faults.

[0033] In this embodiment, the analog signal includes a rotational speed signal characterizing the rotational speed of the gear disc of the hydro-generator. The analog signal input module 120 is used to acquire the rotational speed signal and employs signal filtering and isolation measures. Specifically, the analog signal input module 120 is communicatively connected to a speed sensor installed on the hydro-generator to acquire the gear disc speed sensor signal and employs signal filtering and isolation measures to ensure signal accuracy and isolation from external faults.

[0034] In this embodiment, the voltage transformer signal input module 140 is used to collect the signal from the machine-end voltage transformer and employs signal filtering and isolation measures to ensure the accuracy of the signal and the isolation of external faults.

[0035] In this embodiment, the signal processing module 130 generates an analog speed signal, a switching speed signal, an electrical overspeed switching signal, and a comprehensive switching signal based on the speed signal, voltage inductance signal, failure to operate switching signal, and opening degree switching signal. The comprehensive switching signal characterizes that the turbine generator speed is greater than or equal to a preset speed, the main pressure distribution valve fails to operate, and the guide vane opening is above the no-load level. Specifically, after receiving the speed signal, voltage inductance signal, failure to operate switching signal, and opening degree switching signal, the signal processor performs a judgment and generates the analog speed signal, the switching speed signal, the electrical overspeed switching signal, and the comprehensive switching signal. The analog speed signal is output by the analog signal output module 160, while the switching speed signal, the electrical overspeed switching signal, and the comprehensive switching signal are all output by the switching signal output module 150.

[0036] In this embodiment, the analog signal output module 160 is used to output an analog speed signal to achieve operation monitoring. Specifically, it can output an analog speed signal to the hydropower monitoring system to facilitate real-time monitoring of the turbine generator's speed.

[0037] In this embodiment, the switch signal output module 150 is used to output a speed switch signal for operation monitoring; and the switch signal output module 150 is also used to output an electrical overspeed switch signal and a comprehensive switch signal for emergency shutdown. Specifically, the comprehensive switch signal is used to characterize when the speed of the hydro-generator is greater than or equal to 110% of the rated speed, the main pressure regulating valve fails to operate, and the guide vane opening is above the no-load level. In this embodiment, the switch signal output module 150 can output a speed signal for operation monitoring; at the same time, it can output an electrical overspeed switch signal and an electrical overspeed signal and a switch signal output when the speed is greater than or equal to 110% while the main pressure regulating valve fails to operate and the guide vane opening is above the no-load level, for emergency shutdown.

[0038] It should be noted that the electrical overspeed switching signal here can be a switching signal used to characterize when the electrical speed exceeds 150%, indicating that the speed is too high and a shutdown is required. Similarly, when the electrical speed is greater than or equal to 110% and the main pressure regulating valve fails to operate while the guide vane is open above its no-load opening, this also indicates an abnormality and a shutdown is necessary.

[0039] In this embodiment, the communication module 170 has a communication interface that is communicatively connected to the signal processing module 130, used to upload the rotational speed signal to the hydropower station monitoring system. Specifically, the communication interface can be an Ethernet, RS485, or WiFi communication interface, used to upload the rotational speed signal to the hydropower station monitoring system.

[0040] The hydro-generator speed signal processing device 100 provided in this embodiment acquires the relevant switch signals of the hydro-generator through the switch signal input module 110 and the relevant simulated speed signals of the hydro-generator through the analog signal input module 120. The signal processing module 130 realizes operation monitoring based on the switch signals and the simulated speed signals, and monitors the actual speed and status of the hydro-generator in real time. At the same time, the signal processing module 130 can also realize emergency shutdown based on the switch signals and the simulated speed signals. Compared with the prior art, the present invention adds the switch signals as a reference factor for operation monitoring and emergency shutdown, making monitoring and shutdown more standardized, expanding the judgment range, enriching the judgment conditions, and improving the safety and reliability of the hydro-generator.

[0041] In summary, this application proposes a hydro-generator speed signal processing device 100 for measuring and outputting hydro-generator speed signals. This device collects various signals, including signals from the geared disc speed sensor, the generator terminal voltage transformer, the main pressure distribution valve failure signal, and the guide vane no-load opening signal, to achieve analog and digital output of speed signals for operational monitoring. It also outputs electrical overspeed digital signals and digital signals indicating electrical speed exceeding 110% while the main pressure distribution valve fails to operate and the guide vane no-load opening is above the specified value, for emergency shutdown. This device has multiple communication interfaces, including Ethernet, RS485, and WiFi, allowing direct communication with the power station monitoring system backend to promptly report speed information. Compared to commonly used hydro-generator speed signal devices, this device achieves combined discrimination of electrical speed exceeding 110% while the main pressure distribution valve fails to operate and the guide vane no-load opening is above the specified value, which is more conducive to the safe and stable operation of the hydropower station.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hydroelectric generator speed signal processing device, characterized by, The application relates to a water-turbine-generator-speed-signal processing device. The device comprises: a switch signal input module for acquiring a switch signal; an analog signal input module for acquiring a speed analog signal; a signal processing module in communication connection with the switch signal input module and the analog signal input module, the signal processing module being used for realizing operation monitoring and accident shutdown according to the switch signal and the speed analog signal; the water-turbine-generator-speed-signal processing device further comprises a voltage mutual inductance signal input module in communication connection with the signal processing module, the voltage mutual inductance signal input module being used for acquiring a generator terminal voltage mutual inductor signal and adopting signal filtering and isolation measures, and the signal processing module being further used for realizing operation monitoring and accident shutdown according to the filtered and isolated generator terminal voltage mutual inductor signal; the water-turbine-generator-speed-signal processing device further comprises a communication module with a communication interface in communication connection with the signal processing module, the communication interface being any one of an Ethernet, RS485 and WiFi communication interface, and being used for uploading the speed signal to a hydropower station monitoring system; 2. The hydrogenerator rotational speed signal processing device according to claim 1, characterized in that the water-turbine-generator-speed-signal processing device further comprises a power module in electrical connection with the signal processing module, the switch signal input module, the analog signal input module, the voltage mutual inductance signal input module and the communication module, and the power module being used for realizing power supply.

3. The hydrogenerator rotational speed signal processing device according to claim 2, characterized in that The switch signal comprises a refusal switch signal for representing whether the water-turbine-generator meets the main pressure valve refusal and an opening degree switch signal for representing whether the water-turbine-generator meets the guide vane no-load opening degree, the switch signal input module is used for acquiring the refusal switch signal and the opening degree switch signal and adopting signal filtering and isolation measures.

4. The hydroelectric generator speed signal processing device of claim 3, wherein, The speed analog signal comprises a speed signal for representing the speed of the water-turbine-generator, and the analog signal input module is used for acquiring the speed signal and adopting signal filtering and isolation measures.

5. The hydroelectric generator speed signal processing device of claim 4, wherein, The signal processing module is used for generating a speed analog signal, a speed switch signal, an electrical overspeed switch signal and a comprehensive switch signal according to the speed signal, the voltage mutual inductance signal, the refusal switch signal and the opening degree switch signal, wherein the comprehensive switch signal is used for representing whether the water-turbine-generator meets the conditions of the speed being greater than or equal to a preset speed, the main pressure valve refusal and the guide vane no-load opening degree.

6. The hydroelectric generator speed signal processing device of claim 4, wherein, The water-turbine-generator-speed-signal processing device further comprises an analog signal output module in communication connection with the signal processing module, the analog signal output module being used for outputting the speed analog signal to realize operation monitoring. The water-turbine-generator-speed-signal processing device further comprises a switch signal output module in communication connection with the signal processing module, the switch signal output module being used for outputting the speed switch signal to realize operation monitoring, and the switch signal output module being further used for outputting the electrical overspeed switch signal and the comprehensive switch signal to realize accident shutdown.

7. A hydrogenerator speed signal processing device according to any of claims 4-6, characterized in that The integrated switch quantity signal is used to represent whether the water turbine generator meets the conditions of the rotating speed being greater than or equal to 110% of the rated rotating speed, the main pressure distribution valve being in a state of refusal to act and the guide vane being in a state of open degree above no-load.

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