CN105181014A - Subsynchronous oscillation monitoring system and method - Google Patents
Subsynchronous oscillation monitoring system and method Download PDFInfo
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- CN105181014A CN105181014A CN201510541939.3A CN201510541939A CN105181014A CN 105181014 A CN105181014 A CN 105181014A CN 201510541939 A CN201510541939 A CN 201510541939A CN 105181014 A CN105181014 A CN 105181014A
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Abstract
The invention discloses a subsynchronous oscillation monitoring system and method The invention discloses subsynchronous oscillation monitoring system and a method. The system comprises data processing device and at least one of the following : a rotation speed testing speed device which is connected to the motor and is used for measuring the rotation structure of the engine, a electric quantity sensor which is connected to the secondary side of a voltage reduction transformer which is connected to the outlet port of the generator and is used for measuring the electric quantity on the secondary side of a voltage reduction transformer, wherein the data processing device is connected to the rotation speed measurement device and/or electric quantity sensor, which is used for early alarming and producing fault signal on the condition that the generator rotation speed / or the electric quantity on the secondary side of the voltage reduction transformer. The invention performs real-time monitoring on the rotation speed of the generator and the electric quantity of the secondary side of the voltage reduction transformer which is connected to the outlet port of the generator, and performs early warning or faulted signal under an abnormal so as to determine whether the subsynchronous oscillation exist . Through the technical scheme provided by the invention, the better monitoring synchronization monitoring oscillator effect.
Description
Technical field
The present invention relates to sub-synchronous oscillation monitoring technology, particularly, relate to a kind of sub-synchronous oscillation monitoring system and method.
Background technology
Sub-synchronous oscillation is one of power system stability problem; along with the development of countries in the world electric system; particularly along with China's high voltage, Large Copacity, the continuous construction of AC-HVDC of long distance and generating electricity by way of merging two or more grid systems of scale regenerative resource; the new problem brought by traditional sub-synchronous oscillation and new sub-synchronous oscillation phenomenon are occurred in succession, and this brings again new challenge to the stability study of electric system.Such as, Large-scale fire-electricity unit cluster through HVDC (High Voltage Direct Current) transmission line with exchange the Series compensation lines mixed send time, the convergence type sub-synchronous oscillation problem frequently surmounting generator shaft system accumulation threshold may be caused, and then cause the axle system of Turbo-generator Set to damage.
At present, malfunction monitoring protective device has been installed additional to monitor sub-synchronous oscillation situation in many power plant, but the most function ratio of device is more single, and measuring accuracy is inadequate, can not reach the effect of well monitoring sub-synchronous oscillation.
Summary of the invention
The object of this invention is to provide a kind of sub-synchronous oscillation monitoring system and method, for solving the problem of effectively monitoring sub-synchronous oscillation.
To achieve these goals, the invention provides a kind of sub-synchronous oscillation monitoring system, this system comprises data processing equipment and following at least one: speed equipment, is connected with generator, for measuring the rotating speed of described generator; And electric parameters sensor, be connected to the secondary side of the step-down transformer be connected with described generator outlet, for measuring the electric parameters of the secondary side of this step-down transformer, wherein, described data processing equipment is connected with described speed equipment and/or described electric parameters sensor, for sending early warning or fault-signal when the electric parameters exception of the rotating speed of described generator and/or the secondary side of described step-down transformer.
Preferably, described data processing equipment comprises: electric parameters conversion equipment, and be connected to described electric parameters sensor, the electric parameters for the secondary side by measured step-down transformer is normalized to preset range; A/d conversion device, is connected to described electric parameters conversion equipment, for carrying out AD conversion to the electric parameters after standardization; And treating apparatus, with described AD conversion equipment connection, send early warning or fault-signal for when electric parameters exception after AD conversion, described electric parameters is abnormal to be in outside predetermined electric parameters scope for described electric parameters.
Preferably, described data processing equipment comprises: difference calculating module, with described speed equipment connection, for the rotating speed of measured generator and desired speed are asked poor, obtains rotating speed deviate; Modal filter, is connected with described difference calculating module, for filtering described rotating speed deviate, to obtain torsional oscillation component; And treating apparatus, be connected with described modal filter, for sending early warning or fault-signal when described torsional oscillation component is greater than predetermined torsional oscillation component.
Preferably, described data processing equipment comprises: calculation element, for calculating active power and/or reactive power according to described electric parameters; And treating apparatus, being connected with described calculation element, sending early warning or fault-signal for being in described active power outside predetermined active power scope and/or described reactive power is in outside predetermined reactive power scope.
Preferably, described data processing equipment comprises: treating apparatus, with described speed equipment connection, for sending early warning or fault-signal when the rotating speed of described generator is in outside the predetermined range of speeds.
Preferably, this system also comprises: record ripple plate, is connected to described data processing equipment, for recording and showing the electric parameters of the rotating speed of described generator and/or the secondary side of described step-down transformer.
Correspondingly, present invention also offers a kind of sub-synchronous oscillation monitoring method, the method comprises: the rotating speed measuring generator and the electric parameters of the secondary side of step-down transformer be connected with described generator outlet; And send early warning or fault-signal when the electric parameters exception of the rotating speed of described generator and/or the secondary side of described step-down transformer.
Preferably, early warning is sent when the electric parameters exception of the secondary side of described step-down transformer or fault-signal comprises: the electric parameters of the secondary side of measured step-down transformer is normalized to preset range; AD conversion is carried out to the electric parameters after standardization; And sending early warning or fault-signal when electric parameters exception after AD conversion, described electric parameters is abnormal to be in outside predetermined electric parameters scope for described electric parameters, and described electric parameters exception is in outside predetermined electric parameters scope for described electric parameters.
Preferably, early warning is sent when the rotating speed exception of described generator or fault-signal comprises: the rotating speed of measured generator and desired speed are asked poor, obtains rotating speed deviate; Described rotating speed deviate is filtered, to obtain torsional oscillation component; And send early warning or fault-signal when described torsional oscillation component is greater than predetermined torsional oscillation component.
Preferably, the method also comprises: calculate active power and reactive power according to described electric parameters; And to be in outside predetermined active power scope and/or described reactive power is in outside predetermined reactive power scope in described active power and to send early warning or fault-signal.
Preferably, early warning is sent when the rotating speed exception of described generator or fault-signal comprises: send early warning or fault-signal when the rotating speed of described generator is in outside the predetermined range of speeds.
Preferably, the method also comprises: record and show the electric parameters of the rotating speed of described generator and/or the secondary side of described step-down transformer.
Pass through technique scheme, the present invention carries out Real-Time Monitoring to the rotating speed of generator and the electric parameters of the secondary side of step-down transformer that is connected with generator outlet, early warning or fault-signal is sent when its exception, thus can judge whether to there is sub-synchronous oscillation, the effect of well monitoring sub-synchronous oscillation can be reached by technical scheme provided by the invention.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the block diagram of sub-synchronous oscillation monitoring system provided by the invention;
Fig. 2 is the block diagram comprising the sub-synchronous oscillation monitoring system of the concrete process structure of data processing equipment provided by the invention; And
Fig. 3 is the process flow diagram of sub-synchronous oscillation monitoring method provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the block diagram of sub-synchronous oscillation monitoring system provided by the invention, as shown in Figure 1, this system comprises data processing equipment, and speed equipment and/or electric parameters sensor, that is sub-synchronous oscillation monitoring system provided by the invention only can comprise speed equipment or only comprise electric parameters sensor, also can comprise speed equipment and electric parameters sensor.
Speed equipment is connected with generator, for measuring the rotating speed of generator.Electric parameters sensor is connected to the secondary side of the step-down transformer be connected with generator outlet, for measuring the electric parameters of the secondary side of this step-down transformer.Data processing equipment is connected with speed equipment and/or electric parameters sensor, for sending early warning or fault-signal when the electric parameters exception of the rotating speed of generator and/or the secondary side of step-down transformer.Specifically, when data processing equipment is only connected to speed equipment, this data processing equipment sends early warning or fault-signal when the rotating speed exception of generator, when data processing equipment is only connected to electric parameters sensor, this data processing equipment sends early warning or fault-signal when the electric parameters exception of the secondary side of step-down transformer, when data processing equipment is connected to speed equipment and electric parameters sensor, this data processing equipment sends early warning or fault-signal when the electric parameters of the rotating speed of generator and the secondary side of step-down transformer is all abnormal.Here, those skilled in the art are to be understood that, generally, if there is sub-synchronous oscillation, the electric parameters of the rotating speed of generator and the secondary side of step-down transformer all there will be exception, but also likely occur as special circumstances such as speed equipment or electric parameters sensor faults, so, in practical operation, even if data processing equipment is all connected with speed equipment and electric parameters sensor, also early warning or fault-signal can just be sent when only the rotating speed of generator or one in the electric parameters of the secondary side by means of only step-down transformer occur abnormal.
Wherein, need to process just to carry out abnormal judgement to it to the electric parameters of the rotating speed of generator and the secondary side of step-down transformer, thus for different physical quantitys, data processing equipment is processed by different devices, sets forth this partial content below in conjunction with Fig. 2.Fig. 2 is the block diagram comprising the sub-synchronous oscillation monitoring system of the concrete process structure of data processing equipment provided by the invention.
As shown in Figure 2, data processing equipment can comprise electric parameters conversion equipment and AD (modulus) conversion equipment, electric parameters conversion equipment is connected to electric parameters sensor, electric parameters for the secondary side by measured step-down transformer is normalized to preset range (for the ease of calculating), a/d conversion device is connected to electric parameters conversion equipment, for carrying out AD conversion to the electric parameters after standardization, treating apparatus and AD conversion equipment connection, early warning or fault-signal is sent for when electric parameters exception after AD conversion, wherein electric parameters is extremely for electric parameters is in outside predetermined electric parameters scope.That is, can judge to there is sub-synchronous oscillation when electric parameters exception.
It should be noted that, the electric parameters described in the present invention can be voltage, electric current, those skilled in the art are to be understood that, " electric parameters is in outside predetermined electric parameters scope " as described herein should be independent contrast, that is, when electric parameters is voltage, electric parameters is extremely for voltage is in outside predetermined voltage range, when electric parameters is electric current, electric parameters is extremely for electric current is in outside predetermined voltage range, when electric parameters comprises voltage and current, electric parameters is extremely in outside predetermined voltage range for voltage and/or electric current is in outside predetermined voltage range.Certainly, the present invention is not limited thereto, electric parameters here also can comprise other electric parameters beyond voltage, electric current.
As shown in Figure 2, data processing equipment can also comprise difference calculating module, modal filter and treating apparatus, difference calculating module and speed equipment connection, for the rotating speed of measured generator and desired speed are asked poor, obtains rotating speed deviate; Modal filter is connected with difference calculating module, for filtering rotating speed deviate, to obtain torsional oscillation component; Treating apparatus is connected with modal filter, torsional oscillation component for exporting in modal filter sends early warning or fault-signal when being greater than predetermined torsional oscillation component, that is, the torsional oscillation component exported in modal filter can judge to there is sub-synchronous oscillation when being greater than predetermined torsional oscillation component.
Here modal filter can be an arrowband type bandpass filter, can be with to lead to by 1 second order Butterworth and form with the cascade of 2 second order Butterworth rejection filters, by paid close attention to mode can be leached to the tuning modal filter that makes of modal filter, reduce the interference of other mode, the bandwidth of modal filter is traditionally arranged to be 3Hz.The torsional oscillation component causing sub-synchronous oscillation can be by what make modal filter export to modal filter tuning.
As shown in Figure 2, data processing equipment can also comprise calculation element and treating apparatus.The electric parameters that calculation element is used for obtaining according to electric parameters sensor measurement calculates active power and/or reactive power; Treating apparatus is connected with calculation element, early warning or fault-signal is sent for being in active power outside predetermined active power scope and/or reactive power is in outside predetermined reactive power scope, that is, be in outside predetermined active power scope and/or reactive power is in outside predetermined reactive power scope in active power and can judge to there is sub-synchronous oscillation.
Specifically, when calculation element calculates active power, treating apparatus sends early warning or fault-signal when active power is in outside predetermined active power scope; When calculation element calculates reactive power, treating apparatus sends early warning or fault-signal when reactive power is in outside predetermined reactive power scope; When calculation element calculates active power and reactive power, treating apparatus is in outside predetermined active power scope and/or reactive power is in outside predetermined reactive power scope in active power and sends early warning or fault-signal.
In addition, it will be appreciated by those skilled in the art that, when electric parameters comprises voltage and current, calculation element just can calculate active power and reactive power.
As shown in Figure 2, data processing equipment only can also comprise treating apparatus, this treating apparatus and speed equipment connection, for sending early warning or fault-signal when the rotating speed of generator is in outside the predetermined range of speeds, that is, can judge to there is sub-synchronous oscillation when the rotating speed of generator is in outside the predetermined range of speeds.
Describe respectively for the electric parameters exception of the secondary side of the step-down transformer measured by electric parameters sensor by Fig. 2 above, torsional oscillation component is abnormal, concrete in the abnormal four kinds of situations of the rotating speed of active power and/or reactive power exception and generator judges whether that the technology that there is sub-synchronous oscillation is described, in any one situation of above description, all describe data processing equipment and include treating apparatus, it should be noted that, such description is only for the ease of understanding, as seen in Figure 2, treating apparatus described in above four kinds of situations is same treating apparatus, certainly, technician also can set the treating apparatus of respective numbers according to the actual requirements, such as, for each situation, a treating apparatus is set respectively.
In addition, the invention provides sub-synchronous oscillation monitoring system and can also comprise record ripple plate, be connected to data processing equipment (specifically treating apparatus can be connected to), for recording and showing the electric parameters of the rotating speed of generator and/or the secondary side of step-down transformer.Specifically, record ripple plate can record and the rotating speed etc. of electric parameters after showing AD conversion, torsional oscillation component, active power and/or reactive power exception and generator.
Fig. 3 is the process flow diagram of sub-synchronous oscillation monitoring method provided by the invention, and as shown in Figure 3, the method comprises: the rotating speed measuring generator and the electric parameters of the secondary side of step-down transformer be connected with generator outlet; Early warning or fault-signal is sent when the electric parameters exception of the rotating speed of generator and/or the secondary side of step-down transformer.
It should be noted that, the detail of sub-synchronous oscillation monitoring method provided by the invention and benefit and sub-synchronous oscillation monitoring system provided by the invention similar, in this, it will not go into details.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a sub-synchronous oscillation monitoring system, is characterized in that, this system comprises data processing equipment and following at least one:
Speed equipment, is connected with generator, for measuring the rotating speed of described generator; And
Electric parameters sensor, is connected to the secondary side of the step-down transformer be connected with described generator outlet, for measuring the electric parameters of the secondary side of this step-down transformer,
Wherein, described data processing equipment is connected with described speed equipment and/or described electric parameters sensor, for sending early warning or fault-signal when the electric parameters exception of the rotating speed of described generator and/or the secondary side of described step-down transformer.
2. system according to claim 1, is characterized in that, described data processing equipment comprises:
Electric parameters conversion equipment, be connected to described electric parameters sensor, the electric parameters for the secondary side by measured step-down transformer is normalized to preset range;
A/d conversion device, is connected to described electric parameters conversion equipment, for carrying out AD conversion to the electric parameters after standardization; And
Treating apparatus, with described AD conversion equipment connection, sends early warning or fault-signal for when electric parameters exception after AD conversion, and described electric parameters is abnormal to be in outside predetermined electric parameters scope for described electric parameters.
3. system according to claim 1, is characterized in that, described data processing equipment comprises:
Difference calculating module, with described speed equipment connection, for the rotating speed of measured generator and desired speed are asked poor, obtains rotating speed deviate;
Modal filter, is connected with described difference calculating module, for filtering described rotating speed deviate, to obtain torsional oscillation component; And
Treating apparatus, is connected with described modal filter, for sending early warning or fault-signal when described torsional oscillation component is greater than predetermined torsional oscillation component.
4. system according to claim 1, is characterized in that, described data processing equipment comprises:
Calculation element, for calculating active power and/or reactive power according to described electric parameters; And
Treating apparatus, is connected with described calculation element, sends early warning or fault-signal for being in described active power outside predetermined active power scope and/or described reactive power is in outside predetermined reactive power scope.
5. system according to claim 1, is characterized in that, described data processing equipment comprises:
Treating apparatus, with described speed equipment connection, for sending early warning or fault-signal when the rotating speed of described generator is in outside the predetermined range of speeds.
6. the system any one of claim 1 to 5 described in claim, is characterized in that, this system also comprises:
Record ripple plate, is connected to described data processing equipment, for recording and showing the electric parameters of the rotating speed of described generator and/or the secondary side of described step-down transformer.
7. a sub-synchronous oscillation monitoring method, is characterized in that, the method comprises:
The rotating speed measuring generator and the electric parameters of the secondary side of step-down transformer be connected with described generator outlet; And
Early warning or fault-signal is sent when the electric parameters exception of the rotating speed of described generator and/or the secondary side of described step-down transformer.
8. method according to claim 7, is characterized in that, sends early warning or fault-signal comprises when the electric parameters exception of the secondary side of described step-down transformer:
The electric parameters of the secondary side of measured step-down transformer is normalized to preset range;
AD conversion is carried out to the electric parameters after standardization; And
Send early warning or fault-signal when electric parameters exception after AD conversion, described electric parameters is abnormal to be in outside predetermined electric parameters scope for described electric parameters, and described electric parameters exception is in outside predetermined electric parameters scope for described electric parameters.
9. method according to claim 7, is characterized in that, sends early warning or fault-signal comprises when the rotating speed exception of described generator:
The rotating speed of measured generator and desired speed are asked poor, obtains rotating speed deviate;
Described rotating speed deviate is filtered, to obtain torsional oscillation component; And
Early warning or fault-signal is sent when described torsional oscillation component is greater than predetermined torsional oscillation component.
10. method according to claim 7, is characterized in that, the method also comprises:
Active power and reactive power is calculated according to described electric parameters; And
Be in outside predetermined active power scope and/or described reactive power is in outside predetermined reactive power scope in described active power and send early warning or fault-signal.
11. methods according to claim 7, is characterized in that, send early warning or fault-signal comprises when the rotating speed exception of described generator:
Early warning or fault-signal is sent when the rotating speed of described generator is in outside the predetermined range of speeds.
12. methods any one of claim 7 to 11 described in claim, it is characterized in that, the method also comprises:
Record and show the electric parameters of the rotating speed of described generator and/or the secondary side of described step-down transformer.
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