CN102651550A - Sub-synchronous oscillation suppression method based on controllable series compensation additional impedance deviation control - Google Patents
Sub-synchronous oscillation suppression method based on controllable series compensation additional impedance deviation control Download PDFInfo
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- CN102651550A CN102651550A CN2012101078502A CN201210107850A CN102651550A CN 102651550 A CN102651550 A CN 102651550A CN 2012101078502 A CN2012101078502 A CN 2012101078502A CN 201210107850 A CN201210107850 A CN 201210107850A CN 102651550 A CN102651550 A CN 102651550A
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Abstract
The invention provides a sub-synchronous oscillation suppression method based on controllable series compensation additional impedance deviation control, which belongs to the field of power grid application research. The suppression method comprises the following steps of: constructing a controllable series compensation control system model; selecting an input signal of a controller; analyzing a rotating speed deviation and an impedance deviation; and controlling the impedance deviation. The method is simple and intuitional, has high reliability, and is easy to implement; power grid application is facilitated, and the method has a better application prospect; and in various running ways of a system, the controllable series compensation additional impedance deviation control has a better suppression effect on sub-synchronous oscillation.
Description
Technical field
The invention belongs to electrical network application study field, specifically relate to a kind of sub-synchronous oscillation suppression method based on controlled series compensation additional impedance Deviation Control.
Background technology
Controlled series compensation can carry out large-scale continuous control to line power.From the viewpoint of system, the principle of variable series compensation just makes through suitably changing trigger angle α that the fundamental frequency voltage on the fixed capacitor is improved in the series compensation circuit, and the voltage that this has improved has changed the effective value of series connection condensance.As shown in Figure 1, the controlled series compensation main circuit comprises that capacitor C, shunt reactor LS, bidirectional thyristor and capacitance-resistance absorb branch road.
Sub-synchronous oscillation is a kind of phenomenon that is different from other power system oscillations that is caused by the electric power system mechanical electric coupling; Since this phenomenon possibly directly cause large steam turbine-generator set rotor axle system heavy damage, jeopardize the safe operation of electric power system, so this phenomenon Study is the focus of electric power system always.
In the past; Experts and scholars are existing to the research that contains series compensation system inhibition subsynchronous resonance both at home and abroad; And do not appear in the newspapers on the sub-synchronous oscillation phenomenon electric power system news at home and abroad that causes for controlled series compensation, publication, be necessary the inhibition method of this phenomenon is done with research.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art, the present invention provides a kind of sub-synchronous oscillation suppression method based on controlled series compensation additional impedance Deviation Control, this method simple, intuitive, and reliability is high, is easy to carry out; Help electrical network and use, have application promise in clinical practice; Under the various operational modes of system, controlled series compensation additional impedance Deviation Control can both obtain the better inhibited effect to sub-synchronous oscillation.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
Based on the sub-synchronous oscillation suppression method of controlled series compensation additional impedance Deviation Control, said inhibition method may further comprise the steps:
The input signal of step 2. selection control;
The said impedance deviation of step 4. control.
In the said step 1, the controlled series compensation control system comprises measuring unit, controller regulation and control unit, trigger element and controlled series compensation main circuit unit; Said measuring unit is transferred to said controller regulation and control unit with the signal of gathering, and the triggering signal of regulating and control cell processing through said controller is transferred to the said trigger element that is connected with the controlled series compensation main circuit unit.
Said measuring unit is with the I side bus voltage U of gathering controlled series compensation
1, J side bus voltage U
2, A phase current i
a, B phase current i
bWith C phase current i
cMeasure impedance.
In controlled series compensation open loop control, said controller regulation and control unit triggers according to fixing trigger angle.
In the controlled series compensation closed-loop control, obtain input impedance with said order impedance stack after the impedance deviation process proportional plus integral control that said controller regulation and control unit will order impedance and measurement impedance ratio to obtain, obtain trigger angle after tabling look-up and trigger.
Said controlled series compensation main circuit unit comprises A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually.Said A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually include capacitor, shunt reactor, bidirectional thyristor and capacitance-resistance absorption branch road; Said bidirectional thyristor and capacitance-resistance absorb after the branch road parallel connection with after said shunt reactor is connected, and be parallelly connected with said capacitor again.
In the said step 2, selecting to measure the impedance deviation signal is the input signal of controller.
In the said step 3, said rotating speed deviation and impedance deviation are carried out the Prony Algorithm Analysis.
The parameter of said Prony method analysis comprises model frequency, amplitude, phase angle and damping.
In the said step 4; The comparison command impedance obtains said impedance deviation with the measurement impedance; After the filtering of impedance deviation signal process, phase shift, amplification and the amplitude limiting processing; Stack obtains input impedance with said order impedance and through the impedance deviation after the proportional plus integral control, obtains output impedance after looking into impedance meter.
Compared with prior art, beneficial effect of the present invention is:
1. this method simple, intuitive, reliability is high, is easy to carry out;
2. help electrical network and use, have application promise in clinical practice;
3. can adapt to the various operational modes of electrical network.
Description of drawings
Fig. 1 is a prior art controlled series compensation main circuit sketch map;
Fig. 2 is a controlled series compensation control system structural representation in the embodiment of the invention;
Fig. 3 is a controlled series compensation control system model sketch map in the embodiment of the invention;
Fig. 4 is a controlled series compensation main circuit unit sketch map in the embodiment of the invention;
Fig. 5 is an embodiment of the invention middle controller regulation and control unit regulation and control flow charts;
Fig. 6 is a control group deviation block diagram in the embodiment of the invention;
Fig. 7 is a control group deviation flow chart in the embodiment of the invention;
Fig. 8 is a control group Deviation Control link Parameter Map in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Like Fig. 2, based on the sub-synchronous oscillation suppression method of controlled series compensation additional impedance Deviation Control, said inhibition method may further comprise the steps:
The input signal of step 2. selection control;
The said impedance deviation of step 4. control.
In the said step 1, the controlled series compensation control system comprises measuring unit, controller regulation and control unit, trigger element and controlled series compensation main circuit unit; Said measuring unit is transferred to said controller regulation and control unit with the signal of gathering, and the triggering signal of regulating and control cell processing through said controller is transferred to the said trigger element that is connected with the controlled series compensation main circuit unit.
Said measuring unit is with the I side bus voltage U of gathering controlled series compensation
1, J side bus voltage U
2, A phase current i
a, B phase current i
bWith C phase current i
cMeasure impedance.
In controlled series compensation open loop control, said controller regulation and control unit triggers according to fixing trigger angle.
Like Fig. 4, said controlled series compensation main circuit unit comprises A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually.Said A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually include capacitor, shunt reactor, bidirectional thyristor and capacitance-resistance absorption branch road; Said bidirectional thyristor and capacitance-resistance absorb after the branch road parallel connection with after said shunt reactor is connected, and be parallelly connected with said capacitor again.
Like Fig. 5, in the controlled series compensation closed-loop control, obtain input impedance with said order impedance stack after the impedance deviation process proportional plus integral control that said controller regulation and control unit will order impedance and measurement impedance ratio to obtain, obtain trigger angle after tabling look-up and trigger.
In the said step 2, selecting to measure the impedance deviation signal is the input signal of controller.In the said step 3, said impedance deviation signal is carried out the Prony Algorithm Analysis.Below, explain above-mentioned analytic process through an instance.Certain has the system of sub-synchronous oscillation phenomenon, and the analysis result of controlled series compensation being measured impedance is as shown in table 1:
Table 1
The parameter of said Prony Algorithm Analysis comprises model frequency, amplitude, phase angle and damping.
From table 1, can find out; The sub-synchronous oscillation frequency that constitutes speed error signal and impedance deviation signal is mainly 20.777Hz and 12.474Hz, and wherein, the damping of 20.777Hz component is for negative; Its amplitude is also maximum; The performance of in real system, vibrating is the most serious, and in simulation process, the phase place of rotating speed deviation and each frequency component of impedance deviation remains unchanged.
Obtain said impedance deviation like impedance of Fig. 6 comparison command and measurement impedance; After the filtering of impedance deviation signal process, phase shift, amplification and the amplitude limiting processing; Stack obtains input impedance with said order impedance and through the impedance deviation after the proportional plus integral control, obtains output impedance after looking into impedance meter.
Like Fig. 7-8, the target of additional impedance Deviation Control is that the elimination frequency is the signal of 20.777Hz and 12.474Hz, and the f that frequency is is extracted in block diagram [1]～[5]
1Phase shift is amplified behind=20.777Hz the signal, and it is f that frequency is extracted in block diagram [6]～[10]
2Phase shift is amplified behind the signal of=12.474Hz, and both constitute additional impedance with the amplitude limit link of back (get ± 0.03) and control the back that superposes.The present invention tries out the combination of the most effectively phase shift and gain through phase shifting angle and the interior scanning of gain certain limit according to generator torque or rotating speed.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. based on the sub-synchronous oscillation suppression method of controlled series compensation additional impedance Deviation Control, it is characterized in that: said inhibition method may further comprise the steps:
Step 1. is built controlled series compensation control system model;
The input signal of step 2. selection control;
Step 3. is analyzed rotating speed deviation and impedance deviation;
The said impedance deviation of step 4. control.
2. sub-synchronous oscillation suppression method according to claim 1 is characterized in that: in the said step 1, the controlled series compensation control system comprises measuring unit, controller regulation and control unit, trigger element and controlled series compensation main circuit unit; Said measuring unit is transferred to said controller regulation and control unit with the signal of gathering, and the triggering signal of regulating and control cell processing through said controller is transferred to the said trigger element that is connected with the controlled series compensation main circuit unit.
3. sub-synchronous oscillation suppression method according to claim 2 is characterized in that: said measuring unit is with the I side bus voltage U of gathering controlled series compensation
1, J side bus voltage U
2, A phase current i
a, B phase current i
bWith C phase current i
cMeasure impedance.
4. sub-synchronous oscillation suppression method according to claim 2 is characterized in that: in controlled series compensation open loop control, said controller regulation and control unit triggers according to fixing trigger angle.
5. sub-synchronous oscillation suppression method according to claim 2; It is characterized in that: in the controlled series compensation closed-loop control; Obtain input impedance with said order impedance stack after the impedance deviation process proportional plus integral control that said controller regulation and control unit will order impedance and measurement impedance ratio to obtain, obtain trigger angle after tabling look-up and trigger.
6. sub-synchronous oscillation suppression method according to claim 2 is characterized in that: said controlled series compensation main circuit unit comprises A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually.
7. sub-synchronous oscillation suppression method according to claim 6; It is characterized in that: said A phase main circuit unit, B phase main circuit unit and C main circuit unit mutually include capacitor, shunt reactor, bidirectional thyristor and capacitance-resistance absorption branch road; Said bidirectional thyristor and capacitance-resistance absorb after the branch road parallel connection with after said shunt reactor is connected, and be parallelly connected with said capacitor again.
8. sub-synchronous oscillation suppression method according to claim 1 is characterized in that: in the said step 2, selecting to measure the impedance deviation signal is the input signal of controller.
9. sub-synchronous oscillation suppression method according to claim 1 is characterized in that: in the said step 3, said rotating speed deviation and impedance deviation are carried out the Prony Algorithm Analysis.
10. sub-synchronous oscillation suppression method according to claim 9 is characterized in that: the parameter of said Prony method analysis comprises model frequency, amplitude, phase angle and damping.
11. sub-synchronous oscillation suppression method according to claim 1; It is characterized in that: in the said step 4; The comparison command impedance obtains said impedance deviation with the measurement impedance; The impedance deviation signal through filtering, phase shift, amplification and amplitude limiting processing after, stack obtains input impedance with said order impedance and through the impedance deviation after the proportional plus integral control, obtains output impedance after looking into impedance meter.
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| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN108398600A (en) * | 2018-01-24 | 2018-08-14 | 青岛海洋科学与技术国家实验室发展中心 | Impedance spectrum measurement method and tester based on Prony state space algorithms |
| CN109038619A (en) * | 2018-08-16 | 2018-12-18 | 东北大学 | A kind of sub-synchronous oscillation inhibition device and method based on by-pass current compensation |
| CN109713685A (en) * | 2018-11-07 | 2019-05-03 | 华北电力大学 | It is a kind of to access the tuning on-line method for causing sub-synchronous oscillation suitable for VSC |
| CN111523231A (en) * | 2020-04-22 | 2020-08-11 | 中国华能集团清洁能源技术研究院有限公司 | Subsynchronous oscillation analysis method based on EEMD and Prony method |
| CN117498284A (en) * | 2023-10-26 | 2024-02-02 | 武汉大学 | Series compensation capacitor device based on short-circuit fault current intelligent self-driving |
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| CN101834446A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Sub-synchronous oscillation suppression method based on controlled series compensation |
| CN101969208A (en) * | 2010-09-29 | 2011-02-09 | 东南大学 | Method for inhibiting subsynchronous resonance of wind power system |
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| CN101447675A (en) * | 2008-12-12 | 2009-06-03 | 中国电力科学研究院 | Method for mitigating sub-synchronous resonance |
| CN101834446A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Sub-synchronous oscillation suppression method based on controlled series compensation |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN106130038B (en) * | 2016-06-24 | 2024-02-02 | 全球能源互联网研究院 | Power grid side subsynchronous oscillation suppression device for new energy base fed through series compensation |
| CN108398600A (en) * | 2018-01-24 | 2018-08-14 | 青岛海洋科学与技术国家实验室发展中心 | Impedance spectrum measurement method and tester based on Prony state space algorithms |
| CN108398600B (en) * | 2018-01-24 | 2020-03-31 | 青岛海洋科学与技术国家实验室发展中心 | Impedance spectrum measuring method and tester based on Prony state space algorithm |
| CN109038619A (en) * | 2018-08-16 | 2018-12-18 | 东北大学 | A kind of sub-synchronous oscillation inhibition device and method based on by-pass current compensation |
| CN109713685A (en) * | 2018-11-07 | 2019-05-03 | 华北电力大学 | It is a kind of to access the tuning on-line method for causing sub-synchronous oscillation suitable for VSC |
| CN109713685B (en) * | 2018-11-07 | 2021-01-29 | 华北电力大学 | Online positioning method suitable for VSC access-induced subsynchronous oscillation |
| CN111523231A (en) * | 2020-04-22 | 2020-08-11 | 中国华能集团清洁能源技术研究院有限公司 | Subsynchronous oscillation analysis method based on EEMD and Prony method |
| CN117498284A (en) * | 2023-10-26 | 2024-02-02 | 武汉大学 | Series compensation capacitor device based on short-circuit fault current intelligent self-driving |
| CN117498284B (en) * | 2023-10-26 | 2024-04-05 | 武汉大学 | Series compensation capacitor device based on short-circuit fault current intelligent self-driving |
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