CN101499667A - Apparatus for inhibiting secondary synchronous resonance of turbo generator set - Google Patents
Apparatus for inhibiting secondary synchronous resonance of turbo generator set Download PDFInfo
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- CN101499667A CN101499667A CNA2008102262126A CN200810226212A CN101499667A CN 101499667 A CN101499667 A CN 101499667A CN A2008102262126 A CNA2008102262126 A CN A2008102262126A CN 200810226212 A CN200810226212 A CN 200810226212A CN 101499667 A CN101499667 A CN 101499667A
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- subsynchronous resonance
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- 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
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides a device which uses a controllable high-voltage shunt reactor to inhibit sub-synchronous resonance of a power system and can solve the sub-synchronous resonance problem by a method that a sub-synchronous resonance inhibition module based on the rotation speed measurement of a unit shafting is added in a controller of the controllable high-voltage shunt reactor. The basic structure of the device comprises three parts: a shaft rotation speed measurement system (comprising a shaft rotation speed sensor and a signal processing and transmitting part), an inhibition control system concerning the sub-synchronous resonance and a controllable high-voltage shunt reactor device. The validity of the device is validated by the numerical simulation to a certain planning system.
Description
Technical field
The present invention proposes a kind of device that suppresses hyposynchronous resonance of power system, belongs to the electricity net safety stable control of power science, particularly uses controllable high-voltage shunt reactor to suppress the device of Large Steam Turbine Sets subsynchronous resonance.
Background technology
In electric power system, turbo generator set is mended connecting system through string may cause Steam Turbine axle system and the interactional subsynchronous resonance of electrical network electrical system (sub-synchronous resonance, SSR) phenomenon.Can damage generator shaft system when this electro-machanical resonance phenomena is serious in a short time; Even resonance is lighter, also can significantly consume the mechanical endurance of axle.
After twice torsional oscillation of 1970 and U.S. Mohave plant generator arbor in 1971 system destroyed, the subsynchronous resonance problem caused extensive concern.The essential measure that solves subsynchronous resonance is the risk that takes into full account subsynchronous resonance in the systems organization stage, avoids the generation of subsynchronous resonance from network configuration.External electric network composition is more perfect, has rarely had the report about the subsynchronous resonance problem in recent years.Domestic imbalance owing to the energy and Load distribution, it is comparatively common that the remote thermoelectricity of radial big capacity is sent structure, mends the risk that has subsynchronous resonance at this network configuration installing string.Successively attempted the measure that generating set installing pole-face damping winding, station step-up transformer neutral point installing block filter, additional excitation damping control, controlled bypass resistance, controlled series compensation, dynamic stability device etc. suppress subsynchronous resonance both at home and abroad, all there is certain limitation in above-mentioned measure, for example cost height, weak effect, performance difficulty etc.
Summary of the invention
Send system's subsynchronous resonance problem at thermoelectricity, and the deficiency of existing solution, the present invention proposes a kind of device that suppresses the Steam Turbine subsynchronous resonance, it is characterized in that comprising:
Axle speed measuring system: at first measure the turbo generator set rotating speed, and relatively obtain velocity deviation through signal processing link and unit synchronous speed by shaft speed transducer; Axle speed error signal after handling is input to the inhibition control system;
Inhibition control system at subsynchronous resonance: after the input of described axle speed error signal, therefrom pick out the shafting torsional vibration of turbo-generator set feature, adopt subsynchronous resonance to suppress the online volume controlled order that calculates the high pressure controllable parallel reactors of strategy, and described volume controlled command signal is coordinated to join in the controllable high-voltage shunt reactor device;
Controllable high-voltage shunt reactor device: according to the capacity of the described volume controlled command signal dynamic adjustments high pressure controlled parallel reactor device of importing, reactive power, voltage, active power and the rotating speed of corresponding dynamic adjustment electric power system turbo generator set, reach and suppress the fluctuation of generating unit speed, avoid because mechanical electric coupling causes shaft system of unit at its characteristic frequency generation subsynchronous resonance in subsynchronous frequency range.
Advantage of the present invention is:
Controllable high-voltage shunt reactor is used to solve the reactive balance and the overvoltage problem of ultra-high/extra-high voltage transmission system originally, at present China's two cover 500kV controllable high-voltage shunt reactors that put into operation are also planned to use controllable high-voltage shunt reactor at 750kV, 1000kV electrical network; Controlled height resists the application in the ultra-high/extra-high voltage electrical network will be more and more widely.
Controllable high-voltage shunt reactor adopts power electronic technology, but its capacity dynamic adjustments, and the present invention proposes to add the way solution subsynchronous resonance problem that subsynchronous resonance suppresses module in the controllable high-voltage shunt reactor controller.The tach signal that employing is measured at steam-electric generating set shafting is as input signal, after suitably handling, therefrom pick out the shafting torsional vibration of turbo-generator set feature, adopt subsynchronous resonance to suppress the online volume controlled order that calculates the high pressure controllable parallel reactors of strategy, the capacity of dynamic adjustments high pressure controllable parallel reactors, unit is idle, voltage, meritorious, the corresponding dynamic adjustment of rotating speed, thereby suppress the fluctuation of generating unit speed, reach and avoid because mechanical electric coupling causes shaft system of unit at its characteristic frequency generation subsynchronous resonance in subsynchronous frequency range.The control strategy that the present invention proposes is superimposed upon on the high pressure controllable parallel reactors basic controlling strategy, can not influence the basic function of the anti-compensating reactive power of controlled height, inhibition voltage fluctuation and over-voltage.It is little to have the present invention that high pressure controllable parallel reactors major parameter is changed, and cost increases few.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of device of the present invention;
Fig. 2 is the system wiring figure of simulating, verifying device of the present invention;
Fig. 3 is a subsynchronous resonance phenomenon oscillogram when not adopting braking measure;
Fig. 4 adopts device of the present invention that subsynchronous resonance is suppressed the effect oscillogram.
Embodiment
Controllable high-voltage shunt reactor is used to solve the reactive balance and the overvoltage problem of ultra-high/extra-high voltage transmission system originally, at present China's two cover 500kV controllable high-voltage shunt reactors that put into operation are also planned to use controllable high-voltage shunt reactor in 750kV, 1000kV electrical network.
Conventional controllable high-voltage shunt reactor adopts power electronic technology, but its capacity dynamic adjustments; The present invention proposes to solve the subsynchronous resonance problem by the way that adds subsynchronous resonance inhibition module in the controllable high-voltage shunt reactor controller.Adopting on the suitable control strategy basis, the high pressure controllable parallel reactors can increase the electrical damping of subsynchronous frequency range, thereby reaches the effect that suppresses subsynchronous resonance.Concrete grammar is: adopt the tach signal of measuring at steam-electric generating set shafting as input signal, after suitably handling, therefrom pick out the shafting torsional vibration of turbo-generator set feature, utilize subsynchronous resonance to suppress the online volume controlled order that calculates the high pressure controllable parallel reactors of strategy again, the capacity of dynamic adjustments high pressure controllable parallel reactors, thereby it is idle dynamically to adjust unit, voltage, meritorious, rotating speed, reach and suppress the fluctuation of generating unit speed, avoid because mechanical electric coupling causes shaft system of unit at its characteristic frequency generation subsynchronous resonance in subsynchronous frequency range.
The basic structure of device of the present invention mainly comprises a speed measuring system (comprising shaft speed transducer and signal processing, hop), forms at the inhibition control system and controllable high-voltage shunt reactor device three parts of subsynchronous resonance as shown in Figure 1.
In addition, the subsynchronous resonance restraining device that increases the present invention's proposition in high pressure controllable parallel reactors engineering should be coordinated mutually with high pressure controllable parallel reactors original function.Controlled height is anti-can frequently adjust capacity, and the system that satisfies constantly variation increases the steady stability nargin of system to idle demand; From the angle of dynamic stability, the node voltage that controllable reactance is controlled is as required regulated, and suppresses the voltage fluctuation in the transient process, improves the dynamic electric voltage enabling capabilities.The control strategy that the present invention proposes restraining device is superimposed upon on the high pressure controllable parallel reactors basic controlling strategy, regulate capacity synchronizing frequency (generally being several hertz to the forties hertz) fluctuation in due order of high-voltage shunt reactor, its stable state that causes (or low frequency) capacity fluctuation is 0 substantially, this capacity fluctuation is very little to the influence of the voltage fluctuation of stable state or low frequency variations, therefore can not influence the basic function of anti-compensating reactive power of controlled height and inhibition voltage fluctuation.If the installing of high pressure controllable parallel reactors on the line, then has the function of over-voltage.From the over-voltage angle, under the line failure condition, require the high pressure controllable parallel reactors to be adjusted to heap(ed) capacity rapidly in the time of the route protection action.As if circuit heterogeneous fault takes place, it is cut that then circuit and string thereof are mended the while, do not need high pressure controllable parallel reactors operation inhibition subsynchronous resonance function on this circuit; If circuit generation single-phase fault owing to non-fault phase circuit, string benefit still are in running status, advises that then the high pressure controllable parallel reactors suppresses the also operation simultaneously of subsynchronous resonance device, plays the effect of inhibition subsynchronous resonance.
The capacity command of the present invention's output is proportional to the subsynchronous model frequency rotating speed of shaft system of unit deviation, and under stable situation, owing to suppressed the unit subsynchronous resonance after adopting this device, shaft system of unit rotating speed deviation is near 0, and then Shu Chu capacity command also approaches 0.Be that the present invention is 0 to the anti-stable state capacity requirement of controlled height substantially.Under the transient state disturbance, system operation or fault may cause that all axle system is by its characteristic frequency torsional oscillation, then produce corresponding model's rotating speed deviation, corresponding control system output capacity of the present invention adjusting command, therefore the present invention requires the high pressure controllable parallel reactors that certain transient state capacity regulating ability is arranged, in particular cases may exceed original high pressure controllable parallel reactors ability to work scope at some, in design, can do suitably to adjust according to the requirement that suppresses subsynchronous resonance.For example, might as well establish the original working range demand of high pressure controllable parallel reactors is Q
L～Q
H, the scope of capacity regulating in short-term that the present invention needs is-Q
S～+Q
S, then if adopt the present invention, new high pressure controllable parallel reactors should have (Q
L-Q
S)～(Q
H+ Q
S) the short-term operation ability.Because equipment itself has certain short-time overload capacity, and the present invention's requirement ± Q
SCapacity requirement higher pressure controllable parallel reactors rated capacity is much smaller in short-term, and there therefore should have the present invention that high pressure controllable parallel reactors major parameter is changed to be little, and cost increases few.
The subsynchronous resonance problem only may occur in large electric power plant and send system on the one hand; Controllable high-voltage shunt reactor technical difficulty height, cost height on the other hand, actual at home and abroad at present engineering is few.Therefore this method experimental condition is difficult for possessing.But can adopt its validity of method validation of numerical simulation.With certain 750kV transmission system is example, and this system wiring figure as shown in Figure 2.If this system's sending end inserts the risk that then there is subsynchronous resonance in extensive thermoelectricity; its numerical simulation waveform as shown in Figure 3; among the figure as can be seen between the shaft system of unit mass moment of torsion be divergent trend; in 10 second time, promptly developed into nominal torque 23 times; the shaft system of unit machinery ability to bear that surpasses far away, typical subsynchronous resonance phenomenon has appearred in system.The controllable high-voltage shunt reactor of 5 300Mvar of this system planning installing.On this basis, can consider in controllable parallel reactors, to increase the subsynchronous resonance inhibit feature that the present invention proposes.After adopting the present invention, system's subsynchronous resonance simulation waveform and does not take measures to compare as shown in Figure 4, and moment of torsion is much smaller between the shaft system of unit mass, and is convergent tendency, shows that it is effective that the present invention suppresses subsynchronous resonance.
Invention has been described according to specific exemplary embodiment herein.It will be conspicuous carrying out suitable replacement to one skilled in the art or revise under not departing from the scope of the present invention.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by appended claim definition.
Claims (1)
1, a kind of device that suppresses the Steam Turbine subsynchronous resonance is characterized in that comprising:
Axle speed measuring system: at first measure the turbo generator set rotating speed, and relatively obtain velocity deviation through signal processing link and unit synchronous speed by shaft speed transducer; Axle speed error signal after handling is input to the inhibition control system;
Inhibition control system at subsynchronous resonance: after the input of described axle speed error signal, therefrom pick out the shafting torsional vibration of turbo-generator set feature, adopt subsynchronous resonance to suppress the online volume controlled order that calculates the high pressure controllable parallel reactors of strategy, and described volume controlled command signal is coordinated to join in the controllable high-voltage shunt reactor device;
Controllable high-voltage shunt reactor device: according to the capacity of the described volume controlled command signal dynamic adjustments high pressure controlled parallel reactor device of importing, reactive power, voltage, active power and the rotating speed of corresponding dynamic adjustment electric power system turbo generator set, reach and suppress the fluctuation of generating unit speed, avoid because mechanical electric coupling causes shaft system of unit at its characteristic frequency generation subsynchronous resonance in subsynchronous frequency range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262126A CN101499667A (en) | 2008-11-07 | 2008-11-07 | Apparatus for inhibiting secondary synchronous resonance of turbo generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102262126A CN101499667A (en) | 2008-11-07 | 2008-11-07 | Apparatus for inhibiting secondary synchronous resonance of turbo generator set |
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| CN101499667A true CN101499667A (en) | 2009-08-05 |
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| CNA2008102262126A Pending CN101499667A (en) | 2008-11-07 | 2008-11-07 | Apparatus for inhibiting secondary synchronous resonance of turbo generator set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570950A (en) * | 2012-01-18 | 2012-07-11 | 四方蒙华电（北京）自动化技术有限公司 | Subsynchronous damping control system and subsynchronous damping control method for generator terminals |
| CN106410820A (en) * | 2016-01-20 | 2017-02-15 | 清华大学 | Broadband additional sub/super synchronous oscillation control method and control system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5262677A (en) * | 1991-10-24 | 1993-11-16 | Ramirez Alberto R | Reactor subsynchronous tuning scheme |
| CN1438749A (en) * | 2003-03-19 | 2003-08-27 | 浙江大学 | Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network |
-
2008
- 2008-11-07 CN CNA2008102262126A patent/CN101499667A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5262677A (en) * | 1991-10-24 | 1993-11-16 | Ramirez Alberto R | Reactor subsynchronous tuning scheme |
| CN1438749A (en) * | 2003-03-19 | 2003-08-27 | 浙江大学 | Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network |
Non-Patent Citations (1)
| Title |
|---|
| 武云生等: "静止无功补偿器抑制发电机次同步振荡的效果仿真研究", 《陕西电力》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570950A (en) * | 2012-01-18 | 2012-07-11 | 四方蒙华电（北京）自动化技术有限公司 | Subsynchronous damping control system and subsynchronous damping control method for generator terminals |
| CN102570950B (en) * | 2012-01-18 | 2014-04-30 | 四方蒙华电（北京）自动化技术有限公司 | Subsynchronous damping control system and subsynchronous damping control method for generator terminals |
| CN106410820A (en) * | 2016-01-20 | 2017-02-15 | 清华大学 | Broadband additional sub/super synchronous oscillation control method and control system |
| CN106410820B (en) * | 2016-01-20 | 2019-02-05 | 清华大学 | Additional secondary/supersynchronous oscillation control method of broadband and control system |
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Application publication date: 20090805 |