Oscillation fault processing method and device for hydraulic power plant system

Abstract

The invention provides a hydraulic power plant system oscillation fault processing method and device, and relates to the technical field of power grid fault processing, and the method comprises the steps: monitoring the operation data of a hydraulic power plant, and determining an oscillation state according to the operation data; determining an oscillation type and an oscillating unit in response to oscillation represented by the operation data; determining oscillation reasons and implementing corresponding emergency measures, and adjusting operation parameters of a speed regulator, an excitation system and an auxiliary engine system in the target unit; and rechecking the target unit to determine the running state. Oscillation is found in time by monitoring operation data of the hydraulic power plant, corresponding fault processing measures are taken, effective monitoring and management of the power plant are achieved, normal operation of the power plant is prevented from being affected by faults, and operation safety of the power plant is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power grid fault processing, and in particular to a method and device for processing system oscillation faults in a hydropower plant. Background Art

[0002] During the power generation process of a hydropower plant, when the load of the generator suddenly changes, the rotor has inertia and cannot immediately stabilize at the new power angle value, causing the power angle to swing around the new stable value. This phenomenon is called generator oscillation. Broadband electromagnetic oscillation may endanger the normal operation of renewable energy power generation equipment. For example, sub- / super-synchronous oscillation may cause damage to the crowbar circuit of the wind turbine, causing system stability and power quality problems, and endangering the safe operation of the power system. At present, the detection of oscillation in the same power grid is not timely enough, resulting in insufficient timely handling of faults. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first objective of the present application is to propose a method for handling system oscillation faults in a hydropower plant.

[0005] The second object of the present application is to provide a device.

[0006] The third objective of the present application is to provide an electronic device.

[0007] A fourth objective of the present application is to provide a computer-readable storage medium.

[0008] A fifth object of the present application is to provide a computer program product.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a method for handling system oscillation faults in a hydropower plant, comprising:

[0010] monitoring operating data of the hydropower plant and determining an oscillation state based on the operating data;

[0011] In response to the operating data indicating the occurrence of oscillation, determining the type of oscillation and the unit where the oscillation occurs;

[0012] Determine the cause of the oscillation and implement corresponding emergency measures, and adjust the operating parameters of the speed governor, excitation system, and auxiliary system in the target unit;

[0013] The target unit is reviewed to determine the operating status.

[0014] Optionally, determining the oscillation type includes:

[0015] The occurrence of synchronous oscillation is determined in response to at least one of the following conditions occurring:

[0016] The unit enters island mode and the frequency modulation function operates frequently;

[0017] The oil pump of the speed governor oil pressure device of the unit is frequently started, the speed governor oil pump is started for a long time, the speed governor oil pressure device oil pump runs overtime, the start and stop action signal is activated frequently, and the guide vane and blade opening fluctuates frequently;

[0018] The generator stator current and rotor current indications fluctuate around normal values;

[0019] The generator voltage and bus voltage fluctuate and remain at a high level;

[0020] The active and reactive power of the generator fluctuate around normal values, the vibration of the unit is small, and the vibration rhythm is in sync with the meter fluctuation;

[0021] The generator frequency fluctuates around the normal value, the oscillation period is clear, and the fluctuation frequency is generally within the range.

[0022] Optionally, determining the oscillation type includes:

[0023] The occurrence of asynchronous oscillation is determined in response to at least one of the following conditions occurring:

[0024] The unit enters island mode and the frequency modulation function operates frequently;

[0025] The oil pump of the speed governor oil pressure device of the unit is frequently started, the speed governor oil pump is started for a long time, the speed governor oil pressure device oil pump runs overtime, and the start-stop action signal is activated frequently; the guide vane and blade opening fluctuate frequently;

[0026] The generator stator current and rotor current indications fluctuate around normal values;

[0027] The generator voltage and bus voltage fluctuate and remain at a high level;

[0028] The active and reactive power of the generator fluctuate around normal values, the unit vibration is small, and the vibration rhythm is in sync with the meter fluctuation; the generator frequency fluctuates around normal values, and the oscillation cycle is clear;

[0029] The units cannot maintain synchronous operation, the frequency changes greatly, the oscillation period is unclear, and a certain frequency difference appears, accompanied by multiple protection actions.

[0030] Optionally, the determining the cause of the oscillation and implementing corresponding emergency measures includes:

[0031] If oscillation occurs during the start-up or shutdown operation of the unit, the operation should be suspended immediately;

[0032] If the generator set is connected to the grid asynchronously, the asynchronously connected generator set should be disconnected immediately;

[0033] If the synchronous oscillation is caused by forced oscillation due to abnormalities in the generator set speed governor or excitation regulator, the fault should be eliminated immediately. If it cannot be eliminated in a short time, the abnormally operating generator set should be de-energized.

[0034] Optionally, the determining the cause of the oscillation and implementing corresponding emergency measures includes:

[0035] Immediately increase the reactive power output of the generator to keep the bus voltage within the allowable upper limit;

[0036] If the frequency increases, reduce the active output of the unit to lower the frequency, but the frequency must not be lower than 49.5HZ, and at the same time ensure the normal power supply of the factory electricity;

[0037] If the frequency decreases, immediately increase the active output of the unit to the maximum value until the oscillation is eliminated;

[0038] When the frequency or voltage drops to a level that threatens the safety of the auxiliary power supply, the units (partially or completely) can be disconnected. The units that provide auxiliary power supply should be deloaded first and then disconnected from the system through the high-voltage side circuit breaker of the main transformer. The disconnected units can operate with auxiliary power supply.

[0039] If it occurs when the unit is connected to the grid, causing system oscillation, the generator will be de-energized immediately;

[0040] If the system oscillation is caused by the generator demagnetization, the demagnetization protection action will be performed to monitor the normal shutdown of the disconnected unit;

[0041] When the 230kV system forms a ring-type operating system with the system side, if oscillation occurs due to the ring-opening operation, the ring will be closed immediately through synchronization.

[0042] Optionally, the reviewing the target unit to determine the operating status includes:

[0043] Check the operation of secondary equipment such as the speed governor, excitation system, auxiliary system, whether the governor guide vanes and blades are twitching, the start-up of the oil pressure device, and whether the oil pipeline is leaking;

[0044] If the governor oil tank pressure of the unit drops to 5.3MPa and the oil pressure is still decreasing or the governor oil tank oil level is below 900mm and is still decreasing, apply to switch the governor control mode of the unit to the "manual" position;

[0045] If the switch of important load equipment trips, quickly restore power supply;

[0046] Check whether the governor guide vanes and blades are twitching, whether the oil pressure device is started, whether the oil pipeline is leaking, etc.;

[0047] After discovering oil leakage in the oil pipeline, carry out emergency treatment promptly if the treatment conditions are met;

[0048] Check the vibration of the turbine unit.

[0049] Optionally, the method further comprises implementing the following preventive measures:

[0050] The power system stabilizer formed by the additional control of the excitation control system or other methods is used to compensate for the negative damping torque and suppress the oscillation. The power system stabilizer is normally put into operation;

[0051] The excitation system setting parameters should be adapted to the operation requirements of different interconnection modes of inter-regional AC interconnected power grids, and should be able to provide positive damping for the system setting frequency range;

[0052] In the power system, measures such as fast protection, strong excitation, automatic voltage regulator, and fast excitation system are adopted to reduce the oscillation of the system;

[0053] During operation, avoid making the capacity of the generator greater than the charging power of the no-load line; avoid starting the generator with an no-load line and closing the circuit breaker to the no-load line at full voltage.

[0054] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a hydropower plant system oscillation fault processing device, comprising:

[0055] A monitoring module, used for monitoring the operation data of the hydropower plant and determining the oscillation state according to the operation data;

[0056] a fault determination module, for determining the type of oscillation and the unit where the oscillation occurs in response to the operation data indicating the occurrence of oscillation;

[0057] An emergency module, used to determine the cause of the oscillation and implement corresponding emergency measures, and adjust the operating parameters of the governor, excitation system, and auxiliary system in the target unit;

[0058] The review module is used to review the target unit to determine the operating status.

[0059] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0060] The memory stores computer-executable instructions;

[0061] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0062] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0063] To achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, which implements any method in the first aspect when executed by a processor.

[0064] The hydropower plant system oscillation fault handling method, device, electronic equipment and storage medium provided in the present application timely detect oscillations by monitoring the hydropower plant operation data and implement corresponding fault handling measures, thereby achieving effective monitoring and management of the power plant, avoiding faults from affecting the normal operation of the power plant, and improving the safety of the power plant operation.

[0065] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0067] Figure 1 A schematic flow chart of a method for handling system oscillation faults in a hydropower plant provided in an embodiment of the present application;

[0068] Figure 2 A schematic structural diagram of a hydropower plant system oscillation fault processing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0070] During the power generation process of a hydropower plant, when the load of the generator suddenly changes, the rotor has inertia and cannot immediately stabilize at the new power angle value, causing the power angle to swing around the new stable value. This phenomenon is called generator oscillation. Broadband electromagnetic oscillation may endanger the normal operation of renewable energy power generation equipment. For example, sub- / super-synchronous oscillation may cause damage to the crowbar circuit of the wind turbine, causing system stability and power quality problems, and endangering the safe operation of the power system. At present, the detection of oscillation in the same power grid is not timely enough, resulting in insufficient timely handling of faults.

[0071] To address this problem, the present application provides a method for handling system oscillation faults in a hydropower plant. Figure 1 The flowchart of a method for handling a hydropower plant system oscillation fault provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method comprises the following steps:

[0072] Step 101, monitoring the operation data of the hydropower plant, and determining the oscillation state according to the operation data;

[0073] Step 102, in response to the operating data indicating that oscillation occurs, determining the type of oscillation and the unit where the oscillation occurs;

[0074] Step 103, determining the cause of the oscillation and implementing corresponding emergency measures, adjusting the operating parameters of the speed governor, excitation system, and auxiliary system in the target unit;

[0075] Step 104: review the target unit to determine its operating status.

[0076] In this embodiment, due to the weakness of the local power grid, when the unit PSS is not put into use; the 230kV system voltage is too low; the large load equipment is connected to the power grid; the switches along the power station transmission line are operated or tripped due to a fault; an accident occurs at the Sanghe Power Station; the unit phase leading operation exceeds the limit; the unit speed governor and excitation system fail, it is possible to cause system synchronous oscillation. During synchronous oscillation, each unit still maintains synchronous operation, the active and reactive power of the generator fluctuate around the normal value, the frequency fluctuates in the range of 0.2-2.0Hz, the unit vibration is small, and no unit protection action is taken.

[0077] The damage that oscillation may cause is: the higher the upper or lower limit of the system voltage, the higher the system frequency, threatening the safety of electrical equipment; the factory load cannot operate normally; the auxiliary equipment operates abnormally, causing the unit to shut down unexpectedly; the governor guide vanes and blades twitch frequently, the oil pressure device starts frequently, and the oil pipeline leaks.

[0078] Possible signs before an accident are: whether it is low-frequency oscillation or synchronous or asynchronous oscillation caused by system failure or operation, the accident occurs and develops very quickly, and the signs before the accident are not obvious. However, in the following situations, system oscillation-related accidents should be anticipated: transmission line operation with heavy load; 230kV system voltage is low; 230kV system voltage is high; 230kV system is operated; 230kV new equipment is connected to the grid for trial operation.

[0079] Optionally, determining the oscillation type includes: determining that synchronous oscillation occurs in response to at least one of the following situations:

[0080] 1. It was found on site that the unit entered the island mode and the frequency modulation function was frequently activated.

[0081] 2. The oil pump of the speed governor oil pressure device of the unit starts frequently, the speed governor oil pump starts for a long time, the speed governor oil pressure device oil pump runs for timeout, and the start and stop action signal is activated frequently; the guide vane and blade opening fluctuates frequently.

[0082] 3. The stator current and rotor current indications of the generator fluctuate around normal values.

[0083] 4. The generator voltage and bus voltage fluctuate and remain at a high level (generally not less than 80%).

[0084] 5. The active and reactive power of the generator fluctuate around the normal value, the unit vibrates slightly, and the vibration rhythm is in sync with the meter fluctuation. The generator frequency fluctuates around the normal value, the oscillation cycle is clear, and the fluctuation frequency is generally in the range of 0.2-2.0HZ.

[0085] If the personnel discover the power grid system oscillation, they should immediately report it to the duty person in charge, who will report it to the dispatcher (NCC) and ask about the system situation. Report to the duty leader of the operation and maintenance department, notify the on-call person in charge and the heads of each maintenance team to organize personnel to enter the factory for inspection and handling.

[0086] The person in charge on duty directs the implementation of emergency measures, which include determining the cause of oscillation and implementing corresponding emergency measures, including:

[0087] 1. Immediately increase the generator excitation to raise the voltage (but do not endanger the safety of the equipment). If necessary, appropriately reduce the generator active power.

[0088] 2. If oscillation occurs during the start-up or shutdown operation of the unit, the operation should be stopped immediately.

[0089] 3. If the generator set is connected to the grid asynchronously, the asynchronously connected generator set should be de-energized immediately.

[0090] 4. If the synchronous oscillation is caused by forced oscillation due to abnormalities in the speed governor or excitation regulator of the generator set, the fault should be eliminated immediately. If it cannot be eliminated in a short time, the abnormally operating generator set should be de-energized.

[0091] 5. Notify the mechanical personnel to check whether the governor guide vanes and blades are twitching, the start-up status of the oil pressure device, whether the oil pipeline is leaking, etc., and report the on-site inspection results to the person in charge of emergency response.

[0092] 6. Notify secondary personnel to check the operation of secondary equipment such as the speed governor, excitation system, and auxiliary system, and report the on-site inspection results to the person in charge of emergency response.

[0093] Monitor the elimination of oscillations and the operation of the units, report to the dispatching personnel on duty, and wait for dispatching instructions.

[0094] If the system oscillates violently during this period, causing the protection to trip the 230kV Sesan1, Sesan2, Rata1, Rata2, lines, and the unit frequency protection to operate, the entire plant's power supply to the outside is blocked or the entire plant is out of power, then refer to the line tripping or unit black start disposal card for execution.

[0095] Monitor the upstream water level, report on-site accidents to the water situation center in a timely manner, and make preparations for flood discharge in the dam area.

[0096] Report the accident handling situation to the on-duty leader of the Operation and Maintenance Department.

[0097] Review the target unit to determine the operating status, including:

[0098] On-call staff:

[0099] 1. Immediately go to the site to check the operation of secondary equipment such as the speed governor, excitation system, auxiliary system, whether the guide vanes and blades of the speed governor are twitching, the start-up of the oil pressure device, whether the oil pipeline is leaking, etc., and report the on-site inspection results to the person in charge of emergency response.

[0100] 2. If the unit governor oil tank pressure drops to 5.3MPa and the oil pressure is still dropping, or the governor oil tank oil level is below 900mm and is still dropping, apply to switch the unit governor control mode to the "manual" position, and monitor and stand by the governor cabinet.

[0101] 3. When discovering that the switch of important load equipment has tripped, immediately report to the person in charge on duty and quickly restore power supply.

[0102] 4. Make emergency preparations for 230kV four-circuit line tripping accidents and flood discharge in the dam area.

[0103] Mechanical professionals:

[0104] 1. After receiving the notification, check whether the governor guide vanes and blades are twitching, the start-up of the oil pressure device, whether the oil pipeline is leaking, etc., and report the on-site inspection results to the emergency person in charge.

[0105] 2. When oil pipeline leakage is discovered, emergency treatment should be carried out promptly if the treatment conditions are met.

[0106] 3. Check the vibration of the turbine unit and report any abnormality to the emergency manager immediately.

[0107] Secondary Professionals:

[0108] 1. Upon receiving the notification, promptly go to the site to check the operation of secondary equipment such as the speed governor, excitation system, and auxiliary system, and report the on-site inspection results to the emergency manager.

[0109] Check whether the power system stabilizer (PSS) is in normal operation. If any abnormality is found, report it immediately to the emergency manager for on-site emergency response.

[0110] Optionally, determining the oscillation type includes:

[0111] 1. It was found that the unit entered the island mode and the frequency modulation function was frequently activated.

[0112] 2. The oil pump of the speed governor oil pressure device of the unit starts frequently, the speed governor oil pump starts for a long time, the speed governor oil pressure device oil pump runs for timeout, and the start and stop action signal is activated frequently; the guide vane and blade opening fluctuates frequently.

[0113] 3. The stator current and rotor current indications of the generator fluctuate around normal values.

[0114] 4. The generator voltage and bus voltage fluctuate and remain at a high level (generally not less than 80%).

[0115] 5. The active and reactive power of the generator fluctuate around the normal value, the unit vibrates slightly, and the vibration rhythm is in sync with the meter fluctuation. The generator frequency fluctuates around the normal value, the vibration cycle is clear, and the fluctuation frequency is generally in the range of 0.2-2.0HZ.

[0116] 6. The units cannot maintain synchronous operation, the frequency changes greatly, the oscillation period is unclear, and a certain frequency difference appears, accompanied by multiple protection actions.

[0117] If the personnel discover the power grid system oscillation, they should immediately report it to the duty person in charge, who will report it to the dispatcher (NCC) and ask about the system situation. Report to the duty leader of the operation and maintenance department, notify the on-call person in charge and the heads of each maintenance team to organize personnel to enter the factory for inspection and handling.

[0118] Optionally, the determining the cause of the oscillation and implementing corresponding emergency measures includes:

[0119] 2. Initially take the following measures:

[0120] 1) Immediately increase the reactive output of the generator and try to keep the bus voltage within the allowable upper limit (252kV).

[0121] 2) If the frequency increases, reduce the active output of the unit to lower the frequency, but the frequency must not be lower than 49.5HZ, and at the same time, the normal power supply of the factory should be guaranteed;

[0122] 3) If the frequency decreases, immediately increase the active output of the unit to the maximum value until the oscillation is eliminated.

[0123] 4) When the system oscillates, the generator shall not be removed from the system without the permission of the dispatcher in principle.

[0124] 5) When the frequency or voltage drops to a level that threatens the safety of the power supply to the factory, the units (partially or completely) can be de-energized. Our factory will prioritize the units that carry the power supply to the factory (units 1, 2, and 4) by reducing the load and then de-energizing them from the system through the high-voltage side circuit breaker of the main transformer, and the de-energized units will operate with the power supply to the factory.

[0125] 6) If system oscillation occurs when the unit is connected to the grid, the generator should be de-energized immediately.

[0126] 7) If the system oscillation is caused by generator demagnetization, the demagnetization protection will be activated and the decoupled unit will be monitored and shut down normally.

[0127] 8) When the 230kV system of our plant forms a ring-type operating system with the system side, if oscillation occurs due to the ring-opening operation, the ring should be closed immediately through synchronization.

[0128] If the above measures are effective, the fluctuation of the indicated values ​​of the relevant parameters will slow down, the fluctuation amplitude will gradually decrease until it disappears, and the frequency difference will gradually decrease until it disappears.

[0129] Closely monitor the operation of the running units, with a focus on important parameters such as unit speed, frequency, voltage, speed control system oil pressure, oil level, etc., to ensure that the speed governor oil pressure is above 5.3MPa and the oil level is above 600mm; monitor the switches of important loads of the unit (excitation fan power supply, speed governor oil pressure device motor power supply, high top oil pump power supply, axial flow fan power supply, main shaft seal booster pump power supply, bearing lubricating oil circulation pump power supply, generator secondary cooling water circulation pump power supply) to prevent power failure of important loads; if a switch trip is found, immediately arrange personnel to quickly restore power supply;

[0130] If the governor oil tank pressure of the unit drops to 5.3MPa and the oil pressure is still decreasing or the governor oil tank oil level is below 900mm and is still decreasing, the duty officer shall apply to the NCC to switch the governor control mode of the unit to the "manual" position and arrange the operating personnel to monitor and stand by the governor cabinet;

[0131] After the system is stable, report the handling situation to the dispatcher (NCC) and switch the speed governor control mode of the unit to "automatic";

[0132] Notify the mechanical personnel to check whether the governor guide vanes and blades are twitching, the start-up status of the oil pressure device, and whether there is oil leakage in the oil pipeline.

[0133] Notify secondary personnel to check the operation of secondary equipment such as speed governor, excitation system, and auxiliary system.

[0134] If the system oscillates violently during this period, causing the protection to trip the line and disconnect the unit, refer to the line tripping or unit abnormal shutdown disposal card for execution;

[0135] If the system oscillates violently during this period, causing the protection to trip the 230kV Sesan1, Sesan2, Rata1, Rata2, and line, and the unit frequency protection to operate, causing the entire plant to be blocked from external power transmission or a power outage, refer to the line tripping or unit black start disposal card for execution;

[0136] Monitor the upstream water level, report on-site accidents to the water situation center in a timely manner, and make preparations for flood discharge in the dam area;

[0137] Report the accident handling situation to the on-duty leader of the Operation and Maintenance Department.

[0138] Review the target unit to determine the operating status, including:

[0139] On-call staff:

[0140] 1. If the oil pressure of the speed governor tank of the unit drops to 5.3MPa and the oil pressure is still decreasing, or the oil level of the speed governor tank is below 900mm and is still decreasing, apply to switch the speed governor control mode of the unit to "manual" position, and monitor and stand by the speed governor cabinet;

[0141] 2. Check the switches of important loads of the unit (power supply of the excitation fan, power supply of the motor of the speed regulator oil pressure device, power supply of the high-top oil pump, power supply of the axial fan, power supply of the main shaft seal booster pump, power supply of the bearing lubricating oil circulating oil pump, power supply of the generator secondary cooling water circulating pump) to prevent power loss to important loads; if the switch is found to be tripped, immediately report to the emergency person in charge and quickly restore power supply.

[0142] 3. Make emergency preparations for 230kV four-circuit line tripping accidents and flood discharge in the dam area.

[0143] Mechanical major:

[0144] 1. After receiving the notification, check whether the governor guide vanes and blades are twitching, the start-up of the oil pressure device, whether the oil pipeline is leaking, etc., and report the on-site inspection results to the emergency person in charge.

[0145] 2. When oil pipeline leakage is discovered, emergency treatment should be carried out promptly if the treatment conditions are met.

[0146] 3. Check the vibration of the turbine unit and report any abnormality to the emergency manager immediately.

[0147] Secondary Professionals:

[0148] 1. Upon receiving the notification, promptly go to the site to check the operation of secondary equipment such as the speed governor, excitation system, and auxiliary system, and report the on-site inspection results to the emergency manager.

[0149] 2. Check the protection action, check the switch station and unit fault recording action, analyze the cause of system oscillation, and report the inspection results to the emergency person in charge.

[0150] 3. Check whether the power system stabilizer (PSS) is in normal operation. If any abnormality is found, it should be reported to the emergency person in charge immediately and the abnormality should be handled on site.

[0151] In a possible embodiment, the preventive measures for power grid oscillation are:

[0152] The power system stabilizer formed by the additional control of the excitation control system or other methods is used to compensate for the negative damping torque and suppress the oscillation. The power system stabilizer is normally put into operation;

[0153] The excitation system setting parameters should be adapted to the operation requirements of different interconnection modes of inter-regional AC interconnected power grids, and should be able to provide positive damping for the system setting frequency range;

[0154] In the power system, measures such as fast protection, strong excitation, automatic voltage regulator, and fast excitation system are adopted to reduce the oscillation of the system;

[0155] During operation, avoid making the capacity of the generator greater than the charging power of the no-load line; avoid starting the generator with an no-load line and closing the circuit breaker to the no-load line at full voltage.

[0156] Put the generator out-of-step protection into operation and use it to disconnect the out-of-step generator from the system, or disconnect the two asynchronous parts of the system as required by the dispatching.

[0157] In order to implement the above-mentioned embodiment, the present application also proposes a hydropower plant system oscillation fault processing device. Figure 2 This is a schematic diagram of the structure of a hydropower plant system oscillation fault processing device provided in an embodiment of the present application. Figure 2 As shown, the device comprises:

[0158] A monitoring module 210, for monitoring the operation data of the hydropower plant and determining the oscillation state according to the operation data;

[0159] A fault determination module 220 is used to determine the type of oscillation and the unit where the oscillation occurs in response to the operation data indicating the oscillation occurs;

[0160] The emergency module 230 is used to determine the cause of the oscillation and implement corresponding emergency measures to adjust the operating parameters of the speed governor, excitation system, and auxiliary system in the target unit;

[0161] The review module 240 is used to review the target unit to determine the operating status.

[0162] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0163] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0164] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0165] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0166] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0167] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0168] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0169] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0170] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0171] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0172] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0173] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0174] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0175] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for handling system oscillation faults in a hydropower plant, characterized in that: The following steps are involved: monitoring operating data of the hydropower plant and determining an oscillation state based on the operating data; In response to the operating data indicating the occurrence of oscillation, determining the type of oscillation and the unit where the oscillation occurs; Determine the cause of the oscillation and implement corresponding emergency measures, and adjust the operating parameters of the speed governor, excitation system, and auxiliary system in the target unit; The target unit is reviewed to determine the operating status.

2. The method according to claim 1, characterized in that The determining of the oscillation type comprises: The occurrence of synchronous oscillation is determined in response to at least one of the following conditions occurring: The unit enters island mode and the frequency modulation function operates frequently; The oil pump of the speed governor oil pressure device of the unit is frequently started, the speed governor oil pump is started for a long time, the speed governor oil pressure device oil pump runs overtime, the start and stop action signal is activated frequently, and the guide vane and blade opening fluctuates frequently; The generator stator current and rotor current indications fluctuate around normal values; The generator voltage and bus voltage fluctuate and remain at a high level; The active and reactive power of the generator fluctuate around normal values, the vibration of the unit is small, and the vibration rhythm is in sync with the meter fluctuation; The generator frequency fluctuates around the normal value, the oscillation period is clear, and the fluctuation frequency is generally within the range.

3. The method according to claim 1, characterized in that The determining of the oscillation type comprises: The occurrence of asynchronous oscillation is determined in response to at least one of the following conditions occurring: The unit enters island mode and the frequency modulation function operates frequently; The oil pump of the speed governor oil pressure device of the unit is frequently started, the speed governor oil pump is started for a long time, the speed governor oil pressure device oil pump runs overtime, and the start-stop action signal is activated frequently; the guide vane and blade opening fluctuate frequently; The generator stator current and rotor current indications fluctuate around normal values; The generator voltage and bus voltage fluctuate and remain at a high level; The active and reactive power of the generator fluctuate around normal values, the unit vibration is small, and the vibration rhythm is in sync with the meter fluctuation; the generator frequency fluctuates around normal values, and the oscillation cycle is clear; The units cannot maintain synchronous operation, the frequency changes greatly, the oscillation period is unclear, and a certain frequency difference appears, accompanied by multiple protection actions.

4. The method according to claim 2, characterized in that: Determining the cause of the oscillation and implementing corresponding emergency measures include: If oscillation occurs during the start-up or shutdown operation of the unit, the operation should be suspended immediately; If the generator set is connected to the grid asynchronously, the asynchronously connected generator set should be disconnected immediately; If the synchronous oscillation is caused by forced oscillation due to abnormalities in the generator set speed governor or excitation regulator, the fault should be eliminated immediately. If it cannot be eliminated in a short time, the abnormally operating generator set should be de-energized.

5. The method according to claim 3, characterized in that: Determining the cause of the oscillation and implementing corresponding emergency measures include: Immediately increase the reactive power output of the generator to keep the bus voltage within the allowable upper limit; If the frequency increases, reduce the active output of the unit to lower the frequency, but the frequency must not be lower than 49.5HZ, and at the same time ensure the normal power supply of the factory; If the frequency decreases, immediately increase the active output of the unit to the maximum value until the oscillation is eliminated; When the frequency or voltage drops to a level that threatens the safety of the auxiliary power supply, the units (partially or completely) can be disconnected. The units that provide auxiliary power supply should be deloaded first and then disconnected from the system through the high-voltage side circuit breaker of the main transformer. The disconnected units can operate with auxiliary power supply. If it occurs when the unit is connected to the grid, causing system oscillation, the generator will be de-energized immediately; If the system oscillation is caused by the generator demagnetization, the demagnetization protection action will be performed to monitor the normal shutdown of the disconnected unit; When the 230kV system forms a ring-type operating system with the system side, if oscillation occurs due to the ring-opening operation, the ring will be closed immediately through synchronization.

6. The method according to claim 4 or 5, characterized in that: The step of reviewing the target unit to determine the operating status includes: Check the operation of secondary equipment such as the speed governor, excitation system, auxiliary system, whether the governor guide vanes and blades are twitching, the start-up of the oil pressure device, and whether the oil pipeline is leaking; If the governor oil tank pressure drops to 5.3MPa and is still decreasing, or the governor oil tank oil level is below 900mm and is still decreasing, apply to switch the governor control mode to "manual"; If the switch of important load equipment trips, quickly restore power supply; Check whether the governor guide vanes and blades are twitching, whether the oil pressure device is started, whether the oil pipeline is leaking, etc.; After discovering oil leakage in the oil pipeline, carry out emergency treatment promptly if the treatment conditions are met; Check the vibration of the turbine unit.

7. The method according to claim 1, characterized in that The method also includes implementing the following precautions: The power system stabilizer formed by the additional control of the excitation control system or other methods is used to compensate for the negative damping torque and suppress the oscillation. The power system stabilizer is normally put into operation; The excitation system setting parameters should be adapted to the operation requirements of different interconnection modes of inter-regional AC interconnected power grids, and should be able to provide positive damping for the system setting frequency range; In the power system, measures such as fast protection, strong excitation, automatic voltage regulator, and fast excitation system are adopted to reduce the oscillation of the system; During operation, avoid making the capacity of the generator greater than the charging power of the no-load line; avoid starting the generator with an no-load line and closing the circuit breaker to the no-load line at full voltage.

8. A hydropower plant system oscillation fault processing device, characterized in that: include: A monitoring module, used for monitoring the operation data of the hydropower plant and determining the oscillation state according to the operation data; a fault determination module, for determining the type of oscillation and the unit where the oscillation occurs in response to the operation data indicating the occurrence of oscillation; An emergency module, used to determine the cause of the oscillation and implement corresponding emergency measures, and adjust the operating parameters of the governor, excitation system, and auxiliary system in the target unit; The review module is used to review the target unit to determine the operating status.

9. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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