CN106194570A - The method reducing the alert rate of Turbine Governor System Feedback of Power fault misdescription - Google Patents

The method reducing the alert rate of Turbine Governor System Feedback of Power fault misdescription Download PDF

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Publication number
CN106194570A
CN106194570A CN201610645717.0A CN201610645717A CN106194570A CN 106194570 A CN106194570 A CN 106194570A CN 201610645717 A CN201610645717 A CN 201610645717A CN 106194570 A CN106194570 A CN 106194570A
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unit
sampling
power
value
fault
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蔡龙
黎平
张伟
王书华
王东
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JIANGXI HONGPING PUMPED STORAGE CO Ltd
State Grid Corp of China SGCC
State Grid Xinyuan Co Ltd
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JIANGXI HONGPING PUMPED STORAGE CO Ltd
State Grid Corp of China SGCC
State Grid Xinyuan Co Ltd
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Priority to CN201610645717.0A priority Critical patent/CN106194570A/en
Publication of CN106194570A publication Critical patent/CN106194570A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B15/00—Controlling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/1016—Purpose of the control system in variable speed operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

本发明涉及一种降低水轮机调速系统功率反馈故障误报警率的方法，主要是通过在机组有功功率故障判断逻辑中增加机组频率判据：当机组有功波动采样值达到功率变送器采样越线值时，同时对机组频率采样进行判断，若在采样设定时间内机组频率变化超过机组频率变化设定值，则视为有功波动，不判断功率变送器故障，若在采样设定时间内机组频率变化未超过机组频率变化设定值，则判断功率变送器采样故障，机组有功闭环调节退出，同时切至“开度模式”。从而有效降低了调速系统功率反馈故障误报警率，提高系统的稳定性。

The invention relates to a method for reducing the false alarm rate of power feedback faults in a hydraulic turbine speed control system, mainly by adding a unit frequency criterion in the unit active power failure judgment logic: when the unit active power fluctuation sampling value reaches the power transmitter sampling line At the same time, the unit frequency sampling is judged. If the unit frequency change exceeds the unit frequency change setting value within the sampling setting time, it will be regarded as active power fluctuation, and the power transmitter failure will not be judged. If the unit frequency change within the sampling setting time If the frequency change of the unit does not exceed the set value of the frequency change of the unit, it is judged that the sampling fault of the power transmitter is faulty, the closed-loop adjustment of the active power of the unit is exited, and at the same time, it is switched to the "opening mode". Thereby effectively reducing the false alarm rate of the power feedback fault of the speed control system and improving the stability of the system.

Description

降低水轮机调速系统功率反馈故障误报警率的方法Method for reducing false alarm rate of power feedback failure in hydraulic turbine speed regulation system

技术领域technical field

本发明涉及水轮机调节技术，具体涉及一种降低水轮机调速系统功率反馈故障误报警率的方法。The invention relates to a hydraulic turbine regulation technology, in particular to a method for reducing the false alarm rate of power feedback faults in a hydraulic turbine speed regulation system.

背景技术Background technique

水电站的运行过程中，功率调节的任何环节出现故障，都有可能使运行的机组出力出现异常波动，影响机组的稳定运行。较为常见的是：一洞两机布置的水力单元，其中一台机组甩负荷引起水锤效应导致另外的一台机组负荷波动。During the operation of the hydropower station, if any link of power regulation fails, it may cause abnormal fluctuations in the output of the operating unit and affect the stable operation of the unit. The more common one is: a hydraulic unit with two machines in one hole, where the load shedding of one unit causes the water hammer effect to cause the load fluctuation of the other unit.

特别对于长引水系统，同一水力单元的两台机组相互间水力干扰较大。当其中一台机组跳闸，导叶快速关闭，甩负荷机组的蜗壳压力迅速上升，被扰动机组由于调压井对水锤效应的吸收作用未发生突变，但是在引水系统来水量不变，甩负荷机组耗水量减小的情况下，被扰动机组的水头就会累积升高。直接影响被扰动机组的出力波动超过功率变送器采样越线值，调速系统报功率变送器故障。Especially for the long water diversion system, the hydraulic interference between the two units of the same hydraulic unit is relatively large. When one of the units trips, the guide vane closes quickly, and the volute pressure of the load shedding unit rises rapidly. The disturbed unit does not undergo a sudden change due to the absorption of the water hammer effect by the surge well, but the water flow in the water diversion system remains unchanged, and the shedding When the water consumption of the load unit decreases, the head of the disturbed unit will increase cumulatively. If the output fluctuation directly affecting the disturbed unit exceeds the sampling cross-line value of the power transmitter, the speed control system will report a failure of the power transmitter.

目前，大多数水轮机调速系统中，收到功率变送器故障报警后，将自动切至“开度模式”。这样在开度模式下，默认为稳定运行前的开度不变，由于水头累积升高，导致机组出力不断增加，可能会出现机组过负荷、振动加大、系统不稳等故障。At present, most turbine speed control systems will automatically switch to the "opening mode" after receiving a power transmitter failure alarm. In this way, in the opening mode, the default is that the opening before stable operation remains unchanged. Due to the cumulative increase of the water head, the unit output continues to increase, and failures such as unit overload, increased vibration, and system instability may occur.

发明内容Contents of the invention

本发明的目的在于克服现有技术的不足之处，提供一种既提高机组运行稳定性又能在机组调速器功率反馈“真正故障”时及时动作的方法。The purpose of the present invention is to overcome the disadvantages of the prior art, and provide a method that can not only improve the operation stability of the unit, but also act in time when the power feedback of the governor of the unit is "real failure".

本发明的目的通过以下技术方案来实现。降低水轮机调速系统功率反馈故障误报警率的方法，其步骤为：The object of the present invention is achieved through the following technical solutions. The method for reducing the false alarm rate of power feedback faults in the speed regulating system of hydraulic turbines, the steps are as follows:

(1)通过数据分析的方法，将机组有功功率正常波动采样值与机组有功功率故障采样值进行区分；(1) Through the method of data analysis, the normal fluctuation sampling value of the active power of the unit is distinguished from the sampling value of the active power failure of the unit;

(2)根据调速系统的静特性，在功率反馈故障判据中增加频率判据；(2) According to the static characteristics of the speed control system, the frequency criterion is added to the power feedback fault criterion;

(3)若机组有功波动采样值达到功率变送器采样越线值时，同时对机组频率采样进行判断；(3) If the active power fluctuation sampling value of the unit reaches the sampling cross-line value of the power transmitter, the frequency sampling of the unit is judged at the same time;

(4)根据步骤(3)，若在采样设定时间内机组频率变化超过机组频率变化设定值，则视为有功波动，功率变送器无故障；若在采样设定时间内机组频率变化未超过机组频率变化设定值，则判断功率变送器采样故障，机组有功闭环调节退出，同时切至“开度模式”。(4) According to step (3), if the unit frequency change exceeds the set value of unit frequency change within the sampling setting time, it is regarded as active power fluctuation, and the power transmitter is not faulty; if the unit frequency changes within the sampling setting time If the unit frequency change setting value is not exceeded, it is judged that the power transmitter has a sampling failure, and the unit active power closed-loop adjustment exits, and at the same time switches to the "opening mode".

进一步，所述静特性是指机组在发电工况稳定运行时，机组的频率随负荷波动而波动。Further, the static characteristic refers to that when the unit is running stably in the power generation condition, the frequency of the unit fluctuates with the load fluctuation.

进一步，所述采样值是调速系统对机组功率或机组频率的数据进行采集的数值。Further, the sampled value is the value collected by the speed control system for the data of the unit power or the unit frequency.

进一步，所述采样越线值是指调速系统对机组有功功率进行采样时能够自动识别功率变送器采样故障的最小值。Further, the sampling cross-line value refers to the minimum value that can automatically identify the sampling failure of the power transmitter when the speed control system samples the active power of the unit.

进一步，所述采样设定时间小于机组有功功率反馈故障报警的采样时间，且大于接力器不动时间。Further, the sampling setting time is less than the sampling time of the unit active power feedback fault alarm, and greater than the servomotor immobility time.

进一步，所述机组频率变化设定值根据机组调差率、功率变送器采样越线值进行计算。Further, the set value of the frequency change of the unit is calculated according to the deviation rate of the unit and the sampling crossing value of the power transmitter.

本发明的通过在机组有功功率故障判断逻辑中增加机组频率判据，有效降低了调速系统功率反馈故障误报警率，提高系统的稳定性。The present invention effectively reduces the false alarm rate of the power feedback failure of the speed regulating system by adding the unit frequency criterion in the judgment logic of the active power failure of the unit, and improves the stability of the system.

附图说明Description of drawings

图1是水轮机调节系统静特性关系图。Figure 1 is a diagram of the static characteristics of the water turbine regulating system.

具体实施方式detailed description

下面通过具体实施例对本发明作进一步详述，降低水轮机调速系统功率反馈故障误报警率的方法，其步骤为：The present invention is described in further detail below by specific embodiments, and the method for reducing the false alarm rate of the power feedback failure of the hydraulic turbine speed control system, the steps are:

(1)选定采样设定时间：机组有功功率反馈故障报警的采样时间50ms，调速器接力器不动时间为120ms。根据选定原则，选取采样设定时间为100ms。(1) Selected sampling setting time: the sampling time for unit active power feedback fault alarm is 50ms, and the time for governor servomotor not to move is 120ms. According to the selection principle, the sampling setting time is selected as 100ms.

(2)选定机组频率变化设定值Δf：机组调差率ep＝4％，功率变送器采样越线值设定为额定负荷的10％，机组额定频率为fr＝50Hz。则根据水轮机调节系统静特性(如图1所示)有：(2) Select the frequency change setting value Δf of the unit: the differential rate of the unit e p = 4%, the sampling cross-line value of the power transmitter is set to 10% of the rated load, and the rated frequency of the unit is f r = 50Hz. According to the static characteristics of the water turbine regulating system (as shown in Figure 1), there are:

其中，ΔP为功率变送器采样越线值，Pr为实施例中机组额定负荷。Among them, ΔP is the sampling cross-line value of the power transmitter, and P r is the rated load of the unit in the embodiment.

计算可得：组频率变化设定值Δf＝0.2Hz,为保障判据的灵敏性，适当留取一定裕度，选取Δf＝0.1Hz。It can be obtained by calculation: the set value of group frequency change Δf=0.2Hz, in order to ensure the sensitivity of the criterion, a certain margin is properly reserved, and Δf=0.1Hz is selected.

当机组频率波动在0.1Hz范围内，调速系统检测判据在5个采样设定时间内，检测到功率变化累积超过10％Pr，则判断功率变送器故障。机组有功闭环调节退出，同时切至“开度模式”。When the unit frequency fluctuates within the range of 0.1 Hz and the detection criterion of the speed control system is within 5 sampling setting time, and the accumulated power change is detected to exceed 10% P r , it is judged that the power transmitter is faulty. The active power closed-loop adjustment of the unit exits and switches to the "opening mode" at the same time.

当机组频率波动超过0.1Hz，调速系统检测判据在10个采样设定时间内，不进行功率采样故障判断。When the frequency fluctuation of the unit exceeds 0.1Hz, the detection criterion of the speed control system is within the set time of 10 samples, and no power sampling fault judgment is performed.

当功率变送器测量值大于115％Pr，直接判定功率变送器故障。机组有功闭环调节退出，同时切至“开度模式”。When the measured value of the power transmitter is greater than 115% P r , it is directly determined that the power transmitter is faulty. The active power closed-loop adjustment of the unit exits and switches to the "opening mode" at the same time.

通过运用该方法改进调速系统功率反馈故障判据，遇电网事故且机组出力快速变化时，未再出现功率变送器误判情况。By using this method to improve the power feedback fault criterion of the speed control system, when the power grid accident occurs and the output of the unit changes rapidly, the misjudgment of the power transmitter does not occur again.

Claims (6)

1. the method reducing the alert rate of Turbine Governor System Feedback of Power fault misdescription, it is characterised in that the steps include:
(1) by the method for data analysis, unit active power normal fluctuation sampled value is sampled with unit active power fault Value makes a distinction；
(2) according to the static characteristic of governing system, Feedback of Power failure criterion increases frequency criterion；
(3) if unit meritorious fluctuation sampled value reaches power transducer sampling more line value, unit frequency sampling is carried out simultaneously Judge；
(4) according to step (3), if machine class frequency varies more than machine class frequency change setting value within the sampling setting time, then regard For meritorious fluctuation, power transducer fault-free；If the change of machine class frequency changes not less than machine class frequency within the sampling setting time Setting value, then judge power transducer sample fault, unit gain merit closed loop regulation exit, be switched to " aperture pattern " simultaneously.
Method the most according to claim 1, it is characterised in that described static characteristic refers to that unit is in generating operation mode stable operation Time, the frequency of unit fluctuates with load fluctuation.
Method the most according to claim 1, it is characterised in that described sampled value is that governing system is to the power of the assembling unit or unit The numerical value that the data of frequency are acquired.
Method the most according to claim 1, it is characterised in that described sampling more line value is that governing system is to unit wattful power When rate is sampled, it is possible to automatically identify the minima of power transducer sampling fault.
Method the most according to claim 1, it is characterised in that described sampling sets the time less than unit active power feedback The sampling time of fault alarm, and more than the servomotor dead time.
Method the most according to claim 1, it is characterised in that it is poor that described machine class frequency change setting value is adjusted according to unit Rate, power transducer sampling more line value calculates.
CN201610645717.0A 2016-08-08 2016-08-08 The method reducing the alert rate of Turbine Governor System Feedback of Power fault misdescription Pending CN106194570A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN109340038A (en) * 2018-09-14 2019-02-15 中国长江电力股份有限公司 A kind of power soft fault judgment method based on the judgement of continuous slope change threshold
CN112666418A (en) * 2021-01-14 2021-04-16 中国长江电力股份有限公司 Power transmitter fault diagnosis method based on water head, opening and active power joint curve
CN114427511A (en) * 2022-01-12 2022-05-03 中国长江电力股份有限公司 Hydropower unit power feedback and main feedback signal fault cooperative judgment method

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109340038A (en) * 2018-09-14 2019-02-15 中国长江电力股份有限公司 A kind of power soft fault judgment method based on the judgement of continuous slope change threshold
CN109340038B (en) * 2018-09-14 2020-02-07 中国长江电力股份有限公司 Power gradual change fault judgment method based on continuous slope change threshold judgment
CN112666418A (en) * 2021-01-14 2021-04-16 中国长江电力股份有限公司 Power transmitter fault diagnosis method based on water head, opening and active power joint curve
CN114427511A (en) * 2022-01-12 2022-05-03 中国长江电力股份有限公司 Hydropower unit power feedback and main feedback signal fault cooperative judgment method
CN114427511B (en) * 2022-01-12 2023-07-14 中国长江电力股份有限公司 Hydropower unit power feedback and main connection feedback signal fault collaborative judgment method

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Application publication date: 20161207