CN101908769A - Control device and method for suppressing subsynchronous oscillation - Google Patents
Control device and method for suppressing subsynchronous oscillation Download PDFInfo
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Abstract
The invention relates to a multi-machine stabilization device and a multi-machine stabilization method for suppressing subsynchronous oscillation in a power system. The device comprises a speed measurement cabinet, a controller, a three-phase TCR and a step-down transformer which are connected to the conventional power grid and connected in turn. In the control method, the variation quantity of the rotation speed signals of a plurality of generator sets is used as control quantity, current flowing through the TCR is modulated by changing a thyristor conduction angle in the TCR system through controller operation, and finally the rotation speed of the generator is influenced so as to fulfill the aim of suppressing the subsynchronous oscillation. The device has the advantages of convenient control, simple structure, low cost and the like in the aspect of suppressing the subsynchronous oscillation; moreover, when the plurality of generator sets are arranged at the site, a signal processing unit can be expanded, and relevant components in other controllers are kept unchanged.
Description
Technical field
The present invention relates to suppress in a kind of electric power system the multimachine control device and the method for sub-synchronous oscillation.
Background technology
Along with power system development, putting into operation of superhigh pressure, long-distance transmission line and heavy-duty generator group, and measures such as circuit series capacitor compensation of taking in order to improve stability of power system and ability to transmit electricity and direct current transportation, except incident great economic benefit, brought new problem also for the safe and stable operation of electric power system, subsynchronous oscillation of electrical power system is exactly one of its problem.
Series capacitor compensation may cause the subsynchronous resonance of electric power system, and then causes the axle system of turbo generator set to damage.Sub-synchronous oscillation can cause by distorting stress axle system is damaged.Due to the damage of axle system can be accumulated by long low amplitude value torsional oscillation, also can be by due to the high amplitude torsional oscillation of short time.
At present, utilize TCR+FC type SVC technology to suppress sub-synchronous oscillation at home and abroad and also belong to blank, therefore, be necessary many generating sets time a kind of apparatus and method that suppress the sub-synchronous oscillation problem of invention in fact, to overcome the defective of prior art at big power station.
Summary of the invention
The objective of the invention is to invent a kind of apparatus and method that the sub-synchronous oscillation problem of two or two above generating sets is suppressed simultaneously.This device and control method are that the variable quantity with the tach signal of many generating sets is a controlled quentity controlled variable, the via controller computing is by changing the thyristor angle of flow in the TCR system, the electric current that flows through among the modulation TCR finally influences generator speed, reaches the purpose that suppresses sub-synchronous oscillation.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of subsynchronous oscillation of generator set dynamic stabilization device is characterized in that, this device comprises speed measuring cabinet, controller, three-phase TCR and step-down transformer in the traditional electrical network of access, that link to each other successively;
Its middle controller comprises first controller and second controller, and three-phase TCR comprises the first three-phase TCR and the second three-phase TCR; Described first controller links to each other with the first three-phase TCR, and described second controller links to each other with the second three-phase TCR, and in parallel mutually between the two;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of the tach signal of each generating set in many generating sets to first controller and second controller respectively;
Described first controller and second controller include signal processing unit and main control unit, and described first controller links to each other with the described first three-phase TCR, the second three-phase TCR with second controller, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit, weighted sum 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 filter unit, phasing unit, ratio amplifying unit, weighted sum unit 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 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;
Its middle controller comprises first controller and second controller, and three-phase TCR comprises the first three-phase TCR and the second three-phase TCR; Described first controller links to each other with the first three-phase TCR, and described second controller links to each other with the second three-phase TCR, and in parallel mutually between the two;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of the tach signal of each generating set in many generating sets to first controller and second controller respectively;
Described first controller and second controller include signal processing unit and main control unit, and described first controller links to each other with the described first three-phase TCR, the second three-phase TCR with second controller, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit, weighted sum 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 filter unit, phasing unit, ratio amplifying unit, weighted sum unit 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) filled up the technological gap that utilizes the SVC technology to suppress sub-synchronous oscillation, suppressed having control convenient, simple in structure aspect the sub-synchronous oscillation, advantage such as with low cost.
2) device of every inhibition sub-synchronous oscillation can suppress the sub-synchronous oscillation of the generating set more than two or two simultaneously.
3) two of forming of two controllers device that suppresses sub-synchronous oscillations can be realized the inhibition to the sub-synchronous oscillation of two or many 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 by the spread signal processing unit, 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 structured flowchart of embodiment 1;
Fig. 2 a is the detailed block diagram of first controller of embodiment 1;
Fig. 2 b is the detailed block diagram of second controller of embodiment 1;
Fig. 3 is the structured flowchart of embodiment 2.
Embodiment
Embodiment 1
Be example to connect two generating sets below, further narrate the specific embodiment of the present invention in conjunction with the accompanying drawings.
Please in conjunction with consulting Fig. 1, Fig. 2 a, Fig. 2 b, this subsynchronous oscillation of generator set dynamic stabilization device comprises: the speed measuring cabinet 3, first controller 4, second controller 5, the first three-phase TCR 6, the second three-phase TCR 7 that insert in traditional electrical network and link to each other in turn.The described speed measuring cabinet 3 and first step-down transformer 8, second step-down transformer 9.Above-mentioned each parts are articulated in traditional power transmission network according to Fig. 1, structural representation shown in Figure 2.
The described first three-phase TCR 6 also links to each other with high-tension electricity filter FC respectively with the second three-phase TCR 7, and high-tension electricity filter FC also provides capacitive reactive power except filter action is arranged in the present invention, and the datum mark of operation is provided for TCR.
Described speed measuring cabinet 3 is used for measuring the tach signal that generating set sends, and then tach signal is exported to first controller 4, second controller 5.Described first controller 4, second controller 5 comprise 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. 1,2a, 2b, generator A and generator B link to each other with the 500KV high voltage transmission line of electrical network by step-up transformer separately, speed measuring cabinet 3 is measured the tach signal of generator A and generator B simultaneously, and with the tach signal W_a1 that records, W_b1 inserts described first controller 4, and tach signal W_a2, W_b2 are inserted described second controller 5.
Described speed measuring cabinet 3 is with tach signal W_a1, W_b1 inserts the K1 unit of described first controller 4 with optical cable---in the optical-electrical converter, the control signal of first controller 4 inserts the signal input part of the first three-phase TCR6, (the PT signal is the output signal of voltage transformer to the PT signal of 35kV bus I, effect is to measure the 35KV busbar voltage and provide synchronous for equipment operation) insert the signal input part of first controller 4, the first three-phase TCR6 is via step-down transformer access 500kV bus.In like manner the connected mode of tach signal W_a2, W_b2 and described second controller 5 as can be known repeats no more.
Signal will pass through following treatment step in described first controller 4:
1. photoelectric conversion unit K1, the two-way analog signal W_a1 of speed measuring cabinet 3, W_b1 inserts first controller 4 by optical-electrical converter, and is output into digital signal Wa1, Wb1.
2. comparing unit K2 will obtain Wa1 in this unit, and the generator speed value W0 of Wb1 and standard compares, and obtain separately deviate Δ Wa1 and Δ Wb1.
3. respectively hang oneself low pass, high pass filter K3 of low pass, high-pass filter unit K3, deviate Δ Wa1 and deviate Δ Wb1 filters low frequency and high-frequency signal.
4. band-pass filter unit K4 passes through the signal that this element can obtain corresponding each subsynchronous mode.
5. phasing unit K5, the phasing unit 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.This area it will be understood by those skilled in the art that here and repeats no more.
6. ratio amplifying unit K6, this element are the weight setting part that the final weighted sum of each subsynchronous mode is handled.
7. the weighted sum unit K7 and the unit K8 that averages 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 unit K7.In conjunction with shown in Figure 2, averaging through the unit K8 that averages after weighted sum unit K7 separately at Bra1 and Brb1 obtains admittance controlled quentity controlled variable correction value Δ Br, and then enters the K9 unit.
8. function unit K9, admittance controlled quentity controlled variable correction value Δ Br is obtained synthetic equivalent admittance controlled quentity controlled variable Br with the benchmark admittance Br0 summation of mending flat FC capacity, should become the thyristor trigger angle through function F (α) by synthetic equivalent admittance controlled quentity controlled variable Br, first controller 4 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
It is identical with the flow process that above-mentioned tach signal W_a1, W_b1 inserts described first controller 4 that tach signal W_a2, W_b2 insert the later entire process flow process of described second controller 5, therefore repeats no more.
By above-mentioned treatment step, flow through the reactive current of the subsynchronous component modulation that obtains by the generator speed signal among the first three-phase TCR6 and the second three-phase TCR7, 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.
Embodiment 2
Be example to connect four generating sets below, further narrate the specific embodiment of the present invention in conjunction with the accompanying drawings.Only introduce below with embodiment 1 in the part of difference to some extent.
See also Fig. 3, because 4 generators are arranged, be generator A, generator B, generator C, generator D, therefore described speed measuring cabinet 3 need be measured the tach signal of 4 generating sets simultaneously, then tach signal W_a1, W_b1, W_c1, W_d1 are exported to first controller 4, export tach signal W_a2, W_b2, W_c2, W_d2 to second controller 5.Other method for subsequent processing repeat no more with embodiment 1.
Two embodiment that more than enumerate are two kinds of situations in a plurality of embodiments, in fact can control separate units, Liang Tai, four generating sets by first controller 4 and second controller 5, or four above units of control according to actual needs etc.It will be understood by those skilled in the art that in control, can realize also can realizing by the more control device is set by the signal processing unit of extending controller to many generating sets.Therefore, the various execution modes within the spirit of the present invention all belong to scope disclosed by the invention.
Claims (10)
1. a control device that suppresses sub-synchronous oscillation is characterized in that, this device comprises speed measuring cabinet, controller, three-phase TCR and step-down transformer in the traditional electrical network of access, that link to each other successively;
Its middle controller comprises first controller and second controller, and three-phase TCR comprises the first three-phase TCR and the second three-phase TCR; Described first controller links to each other with the first three-phase TCR, and described second controller links to each other with the second three-phase TCR, and in parallel mutually between the two;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of the tach signal of each generating set in many generating sets to first controller and second controller respectively;
Described first controller and second controller include signal processing unit and main control unit, and described first controller links to each other with the described first three-phase TCR, the second three-phase TCR with second controller, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit, weighted sum 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 filter unit, phasing unit, ratio amplifying unit, weighted sum unit 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, 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 synthetic equivalent admittance controlled quentity controlled variable; To synthesize the equivalent admittance controlled quentity controlled variable and become the trigger angle of 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 synthetic 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. a control method that suppresses sub-synchronous oscillation 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;
Its middle controller comprises first controller and second controller, and three-phase TCR comprises the first three-phase TCR and the second three-phase TCR; Described first controller links to each other with the first three-phase TCR, and described second controller links to each other with the second three-phase TCR, and in parallel mutually between the two;
Described speed measuring cabinet links to each other with generating set, and exports the deviate of the tach signal of each generating set in many generating sets to first controller and second controller respectively;
Described first controller and second controller include signal processing unit and main control unit, and described first controller links to each other with the described first three-phase TCR, the second three-phase TCR with second controller, and described signal processing unit also comprises filter unit, phasing unit, ratio amplifying unit, weighted sum 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 filter unit, phasing unit, ratio amplifying unit, weighted sum unit 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.
7. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 6 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.
8. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 7, 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.
9. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 8 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.
10. subsynchronous oscillation of generator set dynamic stabilization methods according to claim 9, 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 synthetic equivalent admittance controlled quentity controlled variable; To synthesize the equivalent admittance controlled quentity controlled variable and become the trigger angle of 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 synthetic 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.
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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 |
| CN105181014A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Subsynchronous oscillation monitoring system and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325335B (en) * | 2008-07-24 | 2010-09-08 | 清华大学 | Hyposynchronous damped control system |
| CN201430567Y (en) * | 2009-06-03 | 2010-03-24 | 中国神华能源股份有限公司 | Control device for suppressing subsynchronous oscillation |
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Cited By (3)
| 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 |
| CN105181014A (en) * | 2015-08-28 | 2015-12-23 | 中国神华能源股份有限公司 | Subsynchronous oscillation monitoring system 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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