CN101877568A - Dynamic stabilization device and stabilization method for subsynchronous oscillation of generator set - Google Patents
Dynamic stabilization device and stabilization method for subsynchronous oscillation of generator set Download PDFInfo
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Abstract
The invention relates to a dynamic stabilization device and a method for subsynchronous oscillation of a large generator set. The device comprises a speed measuring cabinet, a controller, a three-phase TCR and a step-down transformer; the speed measuring cabinet is connected with the generator set and outputs deviation values of speed signals of the generator set to the controller; the controller comprises a signal processing unit and a main control unit, the controller is connected with the three-phase TCR, and the signal processing unit comprises a filtering unit, a phase correction unit, a scale amplifying unit and an arithmetic unit; an output end of the three-phase TCR is connected with the step-down transformer; and the step-down transformer is connected with a high-voltage bus in a power grid. The device and the method fill the technical gap of inhibiting the subsynchronous oscillation by utilizing SVC technology and have the advantages of convenient control, simple structure, low cost and the like in terms of inhibiting the subsynchronous oscillation. When a plurality of generator sets exist on site, the speed signals of a plurality of machines can be acquired by expanding the signal processing unit of the controller.
Description
Technical field
The present invention relates to a kind of Generator Set sub-synchronous oscillation dynamic stabilization device and antihunt means of being used for.
Background technology
China's electrical network is used less to " string is mended " technology in a period of time in the past, even adopt " string is mended " technology, its technology height is also lower, not because the sub-synchronous oscillation problem took place the situation that network system works the mischief, therefore do not launch actual research at the inhibition problem of sub-synchronous oscillation in addition yet.But, now along with long significantly rising apart from the large capacity transmission demand, for improving " string is mended " technology and direct current transportation technology that ability to transmit electricity and power transmission efficiency extensively adopt, make the sub-synchronous oscillation problem become serious threat China power grid security, and press for the important difficult problem of solution.
Therefore, be necessary to invent a kind of subsynchronous oscillation of generator set dynamic stabilization device and method in fact to overcome the defective of prior art.
Summary of the invention
The object of the present invention is to provide a kind of subsynchronous oscillation of generator set dynamic stabilization device and method based on TCR+FC type SVC device, these apparatus and method can effectively suppress the sub-synchronous oscillation problem of network system.
To achieve these goals, the present invention is achieved through the following technical solutions:
A kind of subsynchronous oscillation of generator set dynamic stabilization device, it comprises speed measuring cabinet, controller, three-phase TCR and the step-down transformer that links to each other successively;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of generating set tach signal to controller;
Described controller comprises signal processing unit and main control unit, and described controller links to each other with described three-phase TCR, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit and arithmetic element;
Described three-phase TCR output termination step-down transformer;
Described step-down transformer is connected with the electrical network high voltage bus;
The deviate of described generating set tach signal converses the thyristor trigger angle of three-phase TCR by described arithmetic element after filtering, phasing, ratio amplification, weighted sum are handled; Described main control unit is that synchronizing signal is controlled this thyristor trigger angle with the PT signal, makes to produce reactive current based on the subsynchronous mode modulation of generator speed signal among the three-phase TCR.
A kind of subsynchronous oscillation of generator set dynamic stabilization methods, the speed measuring cabinet that this method will link to each other successively, controller, three-phase TCR and step-down transformer insert in traditional electrical network;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of generating set tach signal to controller;
Described controller comprises signal processing unit and main control unit, and described controller links to each other with described three-phase TCR, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit and arithmetic element;
Described three-phase TCR output termination step-down transformer;
Described step-down transformer is connected with the electrical network high voltage bus;
The deviate of described generating set tach signal converses the thyristor trigger angle of three-phase TCR by described arithmetic element after filtering, phasing, ratio amplification, weighted sum are handled; Described main control unit is that synchronizing signal is controlled this thyristor trigger angle with the PT signal, makes to produce reactive current based on the subsynchronous mode modulation of generator speed signal among the three-phase TCR.
Compared with prior art, the invention has the beneficial effects as follows:
1) the present invention efficiently solves the sub-synchronous oscillation problem that exists in the electrical network, has filled up the technological gap that utilizes the SVC technology to suppress sub-synchronous oscillation, is suppressing have control convenient, simple in structure, with low cost aspect the sub-synchronous oscillation.
2) every sub-synchronous oscillation dynamic stabilization device can suppress the sub-synchronous oscillation of separate unit or many generating sets simultaneously.
3) two sub-synchronous oscillation dynamic stabilization devices of two controller compositions can be realized the inhibition to the sub-synchronous oscillation of two generating sets, when a device that suppresses sub-synchronous oscillation during in maintenance or fault, can guarantee that still subsynchronous oscillation of generator set is effectively controlled, the operation of not influence system.
4) when there are many generating sets at the scene, can finish the collection of multimachine tach signal by the signal processing unit of extending controller, the associated components in other controllers is constant.
Description of drawings
In order to understand the present invention better, please refer to the following drawings:
Fig. 1 is the phase structure schematic diagram of subsynchronous oscillation of generator set dynamic stabilization device;
Fig. 2 is the overall structure figure of subsynchronous oscillation of generator set dynamic stabilization device;
Fig. 3 is the structure chart of controller.
Embodiment
Further narrate the specific embodiment of the present invention below in conjunction with accompanying drawing.
See Fig. 1, Fig. 2, a kind of subsynchronous oscillation of generator set dynamic stabilization device comprises speed measuring cabinet 3, controller 4, three-phase TCR 5, step-down transformer 6, is articulated in the power transmission network in power plant according to Fig. 1, structural representation shown in Figure 2.
Described speed measuring cabinet 3 is used for measuring the tach signal that generating set sends, and then tach signal is exported to controller 4.Described controller 4 comprises signal processing unit and the main control unit that is made of filter unit, phasing unit, ratio amplifying unit, arithmetic element; Obtain deviate after tach signal and rated rotational frequency signal compare, this deviate converses the thyristor trigger angle of three-phase TCR by arithmetic element after filtering, phasing, ratio amplification, weighted sum are handled; Main control unit is a synchronizing signal control thyristor trigger angle with the PT signal, makes to produce reactive current based on the subsynchronous mode modulation of generator speed signal among the TCR.
Describe the course of work of the present invention in detail below in conjunction with Fig. 3, two-way tach signal Wa1, the Wb1 of generator 1 inserts speed measuring cabinet 3, generator 1 links to each other with the 500kV bus via step-up transformer 2, the two-way output signal W_a1 of speed measuring cabinet 3, W_b1 passes through the optical-electrical converter access controller 4 of K1 link with optical cable, the control signal of controller 4 inserts the signal input part of three-phase TCR 5, the signal input part of the PT access controller 4 of 35kV bus I, three-phase TCR5 inserts the 500kV bus via step-down transformer 6.
Signal will pass through following treatment step in the described controller 4:
1. opto-electronic conversion link K1, the two-way output signal W_a1 of speed measuring cabinet 3, W_b1 is by optical-electrical converter access controller 4.
2. comparing element K2 obtains Wa1 and W0 deviate Δ Wa1 in this link, and Wb1 and W0 deviate Δ Wb1.
3. respectively hang oneself low pass, high pass filter K3 of low pass, high pass filter link K3, deviate Δ Wa1 and deviate Δ Wb1 filters low frequency and high-frequency signal.
4. band pass filter link K4 passes through the signal that this link can obtain corresponding each subsynchronous mode.
5. phasing link K5, the phasing link of corresponding each subsynchronous model frequency, relevant with the time-delay and the system parameters of the entire process of signal, the value of phasing need pass through Theoretical Calculation, and experiment is proofreaied and correct and detection is finally determined.
6. ratio amplifying element K6, this link is the weight setting part that the final weighted sum of each subsynchronous mode is handled.
7. weighted sum link K7 and amplifying element K8 all detect by the mode of weighted sum through the sub-synchronous oscillation modal components that all generator unit shaft systems produced after the weighted sum link K7.In conjunction with shown in Figure 3, just Bra 1 and Brb1 also need to average after weighted sum link K7 separately and obtain equivalent admittance controlled quentity controlled variable Br, then through amplifying element K8, enter the K9 link again.
8. function link K9, the equivalent admittance controlled quentity controlled variable Br that obtains becomes the thyristor trigger angle through function F (α), controller is a synchronizing signal control thyristor trigger angle with the PT signal, make and flow through reactive current among the TCR by the subsynchronous component modulation of generator speed signal, finally influence generator speed, reach the purpose that suppresses sub-synchronous oscillation.
It is Br=(2 π-2 α+Sin2 α)/π ω L that described function F (α) is closed, and according to this functional relation, can calculate the trigger angle of thyristor by the admittance value Br of thyristor-controlled reactor TCR.
In the formula:
The equivalent admittance value of Br-thyristor-controlled reactor TCR
α-thyristor trigger angle
ω-work frequency
The inductance value of L-Controlled Reactor
Owing to flow through the reactive current of the subsynchronous component modulation that is obtained by the generator speed signal among the three-phase TCR, this electric current input 500KV high-voltage fence bus has finally changed generator speed, and then has reached the purpose that suppresses sub-synchronous oscillation.
The foregoing description is only for the usefulness that the present invention is described, and be not to be limitation of the present invention, the those of ordinary skill in relevant technologies field, without departing from the present invention, can also make various variations and modification, therefore, all technical schemes that are equal to also should belong to category disclosed by the invention.
Claims (14)
1. a subsynchronous oscillation of generator set dynamic stabilization device is characterized in that, this device comprises speed measuring cabinet, controller, three-phase TCR and the step-down transformer that links to each other successively;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of generating set tach signal to controller;
Described controller comprises signal processing unit and main control unit, and described controller links to each other with described three-phase TCR, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit and arithmetic element;
Described three-phase TCR output termination step-down transformer;
Described step-down transformer is connected with the electrical network high voltage bus;
The deviate of described generating set tach signal converses the thyristor trigger angle of three-phase TCR by described arithmetic element after filtering, phasing, ratio amplification, weighted sum are handled; Described main control unit is that synchronizing signal is controlled this thyristor trigger angle with the PT signal, makes to produce reactive current based on the subsynchronous mode modulation of generator speed signal among the three-phase TCR.
2. subsynchronous oscillation of generator set dynamic stabilization device according to claim 1 is characterized in that, the deviate of generating set tach signal is to obtain deviate after real-time tach signal of generating set and rated rotational frequency signal compare.
3. subsynchronous oscillation of generator set dynamic stabilization device according to claim 2, it is characterized in that, described filter unit comprises low pass, the high pass filter that the variable quantity of tach signal is filtered low frequency, high-frequency signal through low pass, high pass filter, and each subsynchronous mode signal carried out bandpass filtering treatment respectively, obtain the band pass filter of subsynchronous modal components.
4. subsynchronous oscillation of generator set dynamic stabilization device according to claim 3 is characterized in that, described phasing unit be used for the accepting filter subsynchronous mode signal of unit output carries out phasing with subsynchronous mode signal; Described ratio unit is used for the subsynchronous mode signal that phasing is handled is carried out the ratio processing and amplifying.
5. subsynchronous oscillation of generator set dynamic stabilization device according to claim 4 is characterized in that, described arithmetic element is used for that the subsynchronous mode signal after phasing, the ratio processing and amplifying is weighted the summation processing and obtains the equivalent admittance controlled quentity controlled variable; The trigger angle that should equivalence admittance controlled quentity controlled variable becomes thyristor by function F (α) computing;
It is Br=(2 π-2 α+Sin2 α)/π ω L that described function F (α) is closed, wherein
The equivalent admittance controlled quentity controlled variable of Br-thyristor-controlled reactor TCR
α-thyristor trigger angle
ω-work frequency
The inductance value of L-Controlled Reactor.
6. according to any described subsynchronous oscillation of generator set dynamic stabilization device of claim 1-5, it is characterized in that described subsynchronous oscillation of generator set dynamic stabilization device can be one or more.
7. according to any described subsynchronous oscillation of generator set dynamic stabilization device of claim 1-5, it is characterized in that described subsynchronous oscillation of generator set dynamic stabilization device can suppress the sub-synchronous oscillation of one or more generating set.
8. a subsynchronous oscillation of generator set dynamic stabilization methods is characterized in that, the speed measuring cabinet that this method will link to each other successively, controller, three-phase TCR and step-down transformer insert in traditional electrical network
Described speed measuring cabinet links to each other with generating set, and exports the deviate of generating set tach signal to controller;
Described controller comprises signal processing unit and main control unit, and described controller links to each other with described three-phase TCR, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit and arithmetic element;
Described three-phase TCR output termination step-down transformer;
Described step-down transformer is connected with the electrical network high voltage bus;
The deviate of described generating set tach signal converses the thyristor trigger angle of three-phase TCR by described arithmetic element after filtering, phasing, ratio amplification, weighted sum are handled; Described main control unit is that synchronizing signal is controlled this thyristor trigger angle with the PT signal, makes to produce reactive current based on the subsynchronous mode modulation of generator speed signal among the three-phase TCR.
9. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 8 is characterized in that, the deviate of generating set tach signal is to obtain deviate after real-time tach signal of generating set and rated rotational frequency signal compare.
10. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 9, it is characterized in that, described filter unit comprises low pass, the high pass filter that the variable quantity of tach signal is filtered low frequency, high-frequency signal through low pass, high pass filter, and each subsynchronous mode signal carried out bandpass filtering treatment respectively, obtain the band pass filter of subsynchronous modal components.
11. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 10 is characterized in that, described phasing unit be used for the accepting filter subsynchronous mode signal of unit output carries out phasing with subsynchronous mode signal; Described ratio unit is used for the subsynchronous mode signal that phasing is handled is carried out the ratio processing and amplifying.
12. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 11, it is characterized in that described arithmetic element is used for that the subsynchronous mode signal after phasing, the ratio processing and amplifying is weighted the summation processing and obtains the equivalent admittance controlled quentity controlled variable; The trigger angle that should equivalence admittance controlled quentity controlled variable becomes thyristor by function F (α) computing;
It is Br=(2 π-2 α+Sin2 α)/π ω L that described function F (α) is closed, wherein
The equivalent admittance controlled quentity controlled variable of Br-thyristor-controlled reactor TCR
α-thyristor trigger angle
ω-work frequency
The inductance value of L-Controlled Reactor.
13. any according to Claim 8-12 described subsynchronous oscillation of generator set dynamic stabilization methods is characterized in that described subsynchronous oscillation of generator set dynamic stabilization device can be one or more.
14. any according to Claim 8-12 described subsynchronous oscillation of generator set dynamic stabilization methods is characterized in that described subsynchronous oscillation of generator set dynamic stabilization device can suppress the sub-synchronous oscillation of one or more generating set.
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| CN2009101388102A CN101877568B (en) | 2009-04-30 | 2009-04-30 | Dynamic stabilization device and stabilization method for subsynchronous oscillation of generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158687A (en) * | 2015-08-28 | 2015-12-16 | 中国神华能源股份有限公司 | Power generator subsynchronous oscillation modal signal measuring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158687A (en) * | 2015-08-28 | 2015-12-16 | 中国神华能源股份有限公司 | Power generator subsynchronous oscillation modal signal measuring device and method |
| CN105158687B (en) * | 2015-08-28 | 2018-09-21 | 中国神华能源股份有限公司 | A kind of measuring apparatus and method of generator sub-synchronous oscillation mode signals |
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