CN103475011A - STATCOM-and-TCSC combined subsynchronous oscillation restraining method - Google Patents

STATCOM-and-TCSC combined subsynchronous oscillation restraining method Download PDF

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CN103475011A
CN103475011A CN201310441098XA CN201310441098A CN103475011A CN 103475011 A CN103475011 A CN 103475011A CN 201310441098X A CN201310441098X A CN 201310441098XA CN 201310441098 A CN201310441098 A CN 201310441098A CN 103475011 A CN103475011 A CN 103475011A
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statcom
tcsc
current
synchronous oscillation
sub
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陈甜妹
肖湘宁
郭春林
杨琳
张剑
罗超
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North China Electric Power University
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North China Electric Power University
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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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    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The invention discloses a STATCOM-and-TCSC combined subsynchronous oscillation restraining method in the field of electrical power system control. According to the technical scheme, the motion limitation value of a STATCOM and an adjusting strategy of a TCSC are determined, the modal rotary speed of a power generator is extracted and the maximum value is taken; the current at the power generator end is extracted, the parameters of a current to be compensated are obtained, whether the motion condition of the STATCOM is met is judged, if the motion condition is met, the coordination control of the STATCOM and the TCSC is achieved through the reset and set of a state flag. The STATCOM uses the PWM modulation technology to generate the objective current according to action commands and the parameters of the current to be compensated. The TCSC carries out slight adjustment on a firing angle or an impedance reference value according to adjustment commands and the adjusting strategy. Finally, the TCSC is adjusted to be in a suitable state, the STATCOM is locked, and the subsynchronous oscillation is restrained. According to the STATCOM-and-TCSC combined subsynchronous oscillation restraining method, performance advantages of the STATCOM and the TCSC are sufficiently developed, and the subsynchronous oscillation problem can be rapidly and radically restrained.

Description

A kind of STATCOM combines the method that suppresses sub-synchronous oscillation with TCSC
Technical field
The invention belongs to field of power system control, be specifically related to a kind of STATCOM and combine the method that suppresses sub-synchronous oscillation with TCSC.
Background technology
The fixed series capacitor compensation technology is to improve the circuit transmission capacity, strengthens the very economical mode of the stability of a system, but, when circuit string benefit degree is unreasonable, can cause the sub-synchronous oscillation problem of generator.U.S. Mohave power plant two starter/generator group rotor damage accidents make this problem obtain work about electric power person's great attention, multiple inhibition method has been proposed, comprising installing STATCOM (Static Compensator), TCSC (Thyristor Controlled Series Capacitor) device.STATCOM also is connected in system, usually is equivalent to a current source, fast response time, utilize advanced PWM modulation technique, can generate required waveform arbitrarily, when carrying out the sub-synchronous oscillation inhibition, generate subsynchronous electric current, offset the subsynchronous electric current of generator end, play inhibitory action; The TCSC series connection in the line, by controlling the Trigger Angle of thyristor, change its equivalent reactance, thereby change the resonance frequency of system, make its no longer with the mode torsion frequency complementation of generator, fundamentally suppress by the unreasonable caused sub-synchronous oscillation problem of fixed series compensation degree.
Existing document, when research sub-synchronous oscillation problem, is all only considered separately the inhibition of a kind of FACTS (Flexible Ac Transmission System) device, seldom considers the synergy of multiple FACTS device.STATCOM and TCSC are having advantage separately aspect the inhibition sub-synchronous oscillation: STATCOM device fast response time, the TCSC device can fundamentally be eliminated the condition that sub-synchronous oscillation causes, if both can be joined together, can improve response speed, can fundamentally make sub-synchronous oscillation be inhibited again, but yet there are no relevant achievement in research.
Summary of the invention
The object of the invention is to, propose a kind of STATCOM and combine the method that suppresses sub-synchronous oscillation with TCSC, give full play to STATCOM and TCSC performance advantage separately, system sub-synchronous oscillation problem can be resolved rapidly and fundamentally.
Technical scheme of the present invention is that a kind of STATCOM combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that the method comprises the following steps:
Step 1: determine STATCOM action limit value;
Step 2: determine that TCSC adjusts strategy;
Step 3: the STATCOM state flag bit resets; The state flag bit of STATCOM device is set
Figure 579719DEST_PATH_IMAGE001
, in sub-synchronous oscillation inhibit feature blocking;
Step 4: extract the mode rotating speed;
Step 5: the maximum of asking the mode rotating speed;
Step 6: obtain current parameters to be compensated; Electric current to generator end carries out fft analysis, obtains amplitude and the phase place of the current component of the maximum mode speed-frequency of frequency and generator complementation;
Step 7: judge whether to meet the STATCOM operation condition, if satisfy condition, perform step 8; Otherwise jump to step 10;
The coordination of step 8:STATCOM and TCSC is controlled;
Step 9:STATCOM generates target current;
Step 10:STATCOM locking, TCSC is no longer adjusted;
Figure 111195DEST_PATH_IMAGE002
.
It is, according to the control method of TCSC, to adopt different fine-tuning modes that described TCSC adjusts strategy.If what TCSC adopted is to determine trigger angle control (open loop control), the command value of Trigger Angle is finely tuned; If what TCSC adopted is that constant impedance is controlled, the impedance command value is finely tuned.The Trigger Angle amount trimmed can be set to
Figure 188872DEST_PATH_IMAGE003
, the amount trimmed of impedance can be set to
Figure 96786DEST_PATH_IMAGE004
, wherein
Figure 576308DEST_PATH_IMAGE005
for TCSC first-harmonic equivalent reactance,
Figure 262374DEST_PATH_IMAGE006
capacitor value for electric capacity in the TCSC structure.Amount trimmed can be arranged to other suitable values according to the actual conditions of system.
Describedly judge whether to meet the STATCOM operation condition, its judgment criterion is, when
Figure 92926DEST_PATH_IMAGE007
the time, the STATCOM action; Otherwise STATCOM sub-synchronous oscillation inhibit feature locking.
Figure 7793DEST_PATH_IMAGE008
for maximum mode rotating speed,
Figure 872981DEST_PATH_IMAGE009
for the STATCOM action limit value of setting.
The coordination of described STATCOM and TCSC is controlled, and its method is: to the instruction of STATCOM sending action and current parameters to be compensated; If
Figure 480679DEST_PATH_IMAGE002
, needing to send and adjust order to TCSC simultaneously, the adjustment strategy definite according to step 2 adjusted, and by the set of STATCOM Status Flag,
Figure 798528DEST_PATH_IMAGE010
; Otherwise to TCSC, do not send and adjust order.
Described STATCOM generates target current, and its method is to be by frequency
Figure 267818DEST_PATH_IMAGE011
, amplitude is
Figure 987512DEST_PATH_IMAGE012
, phase place is
Figure 766112DEST_PATH_IMAGE013
the sinusoidal current ripple
Figure 305678DEST_PATH_IMAGE014
as modulating wave, carry out the PWM modulation, be met the switch actuating signals of requirement.
Figure 93506DEST_PATH_IMAGE015
be respectively frequency, amplitude and the phase place of electric current to be compensated.As STATCOM except taking on the sub-synchronous oscillation inhibit feature, while also thering is other function (as reactive power compensation), only need by
Figure 651395DEST_PATH_IMAGE016
as modulating wave, wherein
Figure 866475DEST_PATH_IMAGE017
current-order for other functions.
The sub-synchronous oscillation that the present invention proposes is combined the inhibition method, having given full play to the performance advantage of STATCOM and TCSC device: STATCOM can respond fast to the subsynchronous frequency component transfinited, play the effect of " taking stopgap measures ", suppress the sub-synchronous oscillation divergence speed, gain time for TCSC adjusts to suitable running status; TCSC, by command value is transferred to desired value, is offset system frequency, fundamentally eliminates the condition that sub-synchronous oscillation occurs, and plays the effect of " effecting a permanent cure "; Both coordinations realize with set by resetting of flag bit Flag.The method can reduce STATCOM device action time, improves device lifetime, and can be fast, essence ground suppresses the sub-synchronous oscillation problem.
The accompanying drawing explanation
Fig. 1 is TCSC and STATCOM structural representation.
Fig. 2 is the single system structure chart for instance analysis.
Fig. 3 is that STATCOM combines inhibition sub-synchronous oscillation method flow diagram with TCSC.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
It in Fig. 1, is the structural representation of TCSC and STATCOM device.The capacitor value of TCSC device capacitive branch is , for power frequency 50HZ (or 60HZ), TCR props up the two-way anti-parallel thyristor of route and inductance is in series.Two reverse thyristors are T1 and T2, and inductance value is L.By controlling the Trigger Angle of T1 and T2, the equivalent reactance that can regulate TCSC.The TCSC both end voltage is
Figure 382405DEST_PATH_IMAGE020
, electric current is , the TCR branch current is
Figure 42066DEST_PATH_IMAGE022
, the capacitive branch electric current is
Figure 906117DEST_PATH_IMAGE023
.Right
Figure 189331DEST_PATH_IMAGE024
with
Figure 746214DEST_PATH_IMAGE025
carry out the FFT decomposition, can obtain respectively its effective value and phase angle:
Figure 996935DEST_PATH_IMAGE026
, with
Figure 802397DEST_PATH_IMAGE028
,
Figure 530182DEST_PATH_IMAGE029
.The first-harmonic equiva lent impedance of TCSC is
Figure 753353DEST_PATH_IMAGE030
, impedance factor
Figure 975518DEST_PATH_IMAGE031
.STATCOM passes through inductance L sin connecting system in parallel, output voltage is
Figure 233324DEST_PATH_IMAGE032
, electric current is
Figure 866431DEST_PATH_IMAGE033
, access point voltage is
Figure 842477DEST_PATH_IMAGE034
.
Fig. 2 is the single system structure chart for instance analysis.Generator G is connected with Infinite bus system by serial supplementary line, and the circuit string is mended by fixed series compensation X cwith controlled series compensation TCSC, form, STATCOM is connected on generator end, is equivalent to a current source.If generator G has
Figure 852021DEST_PATH_IMAGE035
individual mode, model frequency is , corresponding subsynchronous frequency is
Figure 283188DEST_PATH_IMAGE037
, be designated as
Figure 480952DEST_PATH_IMAGE038
.
Fig. 3 is that STATCOM combines the flow chart that suppresses the sub-synchronous oscillation method with TCSC, for the state flag bit of STACOM device, for coordinating the control of STACOM and TCSC.When system is disturbed, and circuit string benefit degree can cause the sub-synchronous oscillation problem when unreasonable, and STATCOM combines the basic step that suppresses the sub-synchronous oscillation method and is with TCSC.
Step 1: the action limit value of determining STATCOM.In order to guarantee the safety of generator amature, mode all has been installed on rotor axial system and has monitored warning device, when the mode rotating speed surpasses setting value
Figure 261006DEST_PATH_IMAGE040
the time, can form fatigue accumulation to rotor, the warning device action.In order to judge whether fast to occur sub-synchronous oscillation, STATCOM moves limit value
Figure 501494DEST_PATH_IMAGE041
should meet:
Figure 199935DEST_PATH_IMAGE042
, wherein
Figure 551282DEST_PATH_IMAGE043
under normal circumstances, the maximum of all mode rotating speeds;
Figure 638187DEST_PATH_IMAGE044
it is the warning limit value of all mode rotating speeds.For convenient application, can by
Figure 783998DEST_PATH_IMAGE009
be set as , as
Figure 376970DEST_PATH_IMAGE046
, .If necessary, can, according to actual conditions, this value be adjusted.
Step 2: determine that TCSC adjusts strategy.If TCSC is for to determine trigger angle control, amount trimmed can be set to
Figure 149940DEST_PATH_IMAGE003
; If TCSC is constant impedance, control, amount trimmed can be set to
Figure 544012DEST_PATH_IMAGE048
,
Figure 237162DEST_PATH_IMAGE049
for impedance factor.
Step 3: the STATCOM state flag bit resets. , STATCOM does not move, and does not carry out the sub-synchronous oscillation inhibition.
Step 4: extract the mode rotating speed.Rotating speed to generator
Figure 68163DEST_PATH_IMAGE050
carry out signals collecting, then to the rotating speed departure
Figure 683952DEST_PATH_IMAGE051
carry out mode filtering, extract each mode amount
Figure 446371DEST_PATH_IMAGE036
.
Step 5: the maximum of asking the mode rotating speed.Relatively mode rotating speed size, seek out maximum
Figure 96795DEST_PATH_IMAGE008
, establish .
Step 6: obtain current parameters to be compensated.Extract the electric current of generator end
Figure 904400DEST_PATH_IMAGE053
, it is carried out to the FFT decomposition, obtain frequency and be the amplitude of current component
Figure 975442DEST_PATH_IMAGE055
and phase place .Electric current to be compensated is
Figure 926397DEST_PATH_IMAGE057
.
Step 7: judge whether to meet the STATCOM operation condition, if satisfy condition, perform step 8; Otherwise jump to step 10.Relatively
Figure 765040DEST_PATH_IMAGE008
with
Figure 403439DEST_PATH_IMAGE009
size, if
Figure 934914DEST_PATH_IMAGE007
, meet operation condition, proceed to next step; Otherwise perform step 10.
The coordination of step 8:STATCOM and TCSC is controlled.To the instruction of STATCOM sending action, reach ,
Figure 654925DEST_PATH_IMAGE054
, value; If
Figure 820513DEST_PATH_IMAGE002
, send and adjust order to TCSC simultaneously, otherwise to TCSC, do not send and adjust order.After being adjusted order, TCSC is adjusted the instruction references value.If adopting, TCSC determines trigger angle control, to the Trigger Angle reference value adjusted, amount trimmed is set to
Figure 831512DEST_PATH_IMAGE003
, after adjustment, the Trigger Angle reference value is
Figure 431120DEST_PATH_IMAGE059
; If TCSC adopts constant impedance to control, adjust the impedance factor reference value , amount trimmed is set to , after adjustment, the impedance factor reference value
Figure 91537DEST_PATH_IMAGE062
.After TCSC has adjusted, by the set of STATCOM Status Flag,
Figure 811231DEST_PATH_IMAGE010
.
Step 9:STATCOM generates target current.By amplitude, be
Figure 589831DEST_PATH_IMAGE055
, frequency is
Figure 129397DEST_PATH_IMAGE054
, phase place is
Figure 651645DEST_PATH_IMAGE056
the sinusoidal current ripple
Figure 475114DEST_PATH_IMAGE014
as modulating wave, carry out the PWM modulation, be met the switch actuating signals of requirement.As STATCOM except taking on subsynchronous inhibit feature, while also thering is other function (as reactive power compensation), only need by
Figure 424615DEST_PATH_IMAGE016
as modulating wave, wherein
Figure 717056DEST_PATH_IMAGE017
current-order for other functions.
Step 10:STATCOM locking, TCSC is no longer adjusted.After TCSC Trigger Angle (or equiva lent impedance) is adjusted to desired value, system sub-synchronous oscillation problem is suppressed well, and mode rotating speed component is very little, lower than the action set point of STATCOM
Figure 777416DEST_PATH_IMAGE009
, now TCSC maintains the instruction references value after adjustment, and STACOM no longer produces the sub-synchronous oscillation offset current,
Figure 471703DEST_PATH_IMAGE002
.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, anyly is familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (5)

1. a STATCOM combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that the method comprises the following steps:
Step 1: determine STATCOM action limit value;
Step 2: determine that TCSC adjusts strategy;
Step 3: the STATCOM state flag bit resets; The state flag bit of STATCOM device is set
Figure 268726DEST_PATH_IMAGE001
, in sub-synchronous oscillation inhibit feature blocking;
Step 4: extract the mode rotating speed;
Step 5: the maximum of asking the mode rotating speed;
Step 6: obtain current parameters to be compensated; Electric current to generator end carries out fft analysis, obtains amplitude and the phase place of the current component of the maximum mode speed-frequency of frequency and generator complementation;
Step 7: judge whether to meet the STATCOM operation condition, if satisfy condition, perform step 8; Otherwise jump to step 10;
The coordination of step 8:STATCOM and TCSC is controlled;
Step 9:STATCOM generates target current;
Step 10:STATCOM locking, TCSC is no longer adjusted,
Figure 517305DEST_PATH_IMAGE001
.
2. a kind of STATCOM according to claim 1 combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that: described TCSC adjusts strategy and is, control method according to TCSC, adopt different fine-tuning modes, if what TCSC adopted is to determine trigger angle control (open loop control), the command value of Trigger Angle is finely tuned; If what TCSC adopted is that constant impedance is controlled, the impedance command value to be finely tuned, the Trigger Angle amount trimmed can be set to
Figure 201310441098X100001DEST_PATH_IMAGE002
, the amount trimmed of impedance can be set to
Figure 722634DEST_PATH_IMAGE003
, wherein
Figure 201310441098X100001DEST_PATH_IMAGE004
for TCSC first-harmonic equivalent reactance,
Figure 740268DEST_PATH_IMAGE005
for the capacitor value of electric capacity in the TCSC structure, amount trimmed can be arranged to other suitable values according to the actual conditions of system.
3. a kind of STATCOM according to claim 1 combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that: describedly judge whether to meet the STATCOM operation condition, its judgment criterion is, when
Figure 201310441098X100001DEST_PATH_IMAGE006
the time, the STATCOM action; Otherwise the locking of STATCOM sub-synchronous oscillation inhibit feature,
Figure 516725DEST_PATH_IMAGE007
for maximum mode rotating speed,
Figure 201310441098X100001DEST_PATH_IMAGE008
for the STATCOM action limit value of setting.
4. a kind of STATCOM according to claim 1 combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that: the coordination of described STATCOM and TCSC is controlled, and its method is: to the instruction of STATCOM sending action and current parameters to be compensated; If
Figure 721442DEST_PATH_IMAGE001
, needing to send and adjust order to TCSC simultaneously, the adjustment strategy definite according to step 2 adjusted, and by the set of STATCOM Status Flag,
Figure 389184DEST_PATH_IMAGE009
; Otherwise to TCSC, do not send and adjust order.
5. a kind of STATCOM according to claim 1 combines the method that suppresses sub-synchronous oscillation with TCSC, it is characterized in that: described STATCOM generates target current, and its method is to be by frequency
Figure 201310441098X100001DEST_PATH_IMAGE010
, amplitude is
Figure 245013DEST_PATH_IMAGE011
, phase place is
Figure 201310441098X100001DEST_PATH_IMAGE012
the sinusoidal current ripple
Figure 441639DEST_PATH_IMAGE013
as modulating wave, carry out the PWM modulation, be met the switch actuating signals of requirement, be respectively frequency, amplitude and the phase place of electric current to be compensated, as STATCOM except taking on the sub-synchronous oscillation inhibit feature, while also thering is other function (as reactive power compensation), only need by
Figure 147034DEST_PATH_IMAGE015
as modulating wave, wherein
Figure 201310441098X100001DEST_PATH_IMAGE016
current-order for other functions.
CN201310441098XA 2013-09-25 2013-09-25 STATCOM-and-TCSC combined subsynchronous oscillation restraining method Pending CN103475011A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107611998A (en) * 2017-09-22 2018-01-19 中国南方电网有限责任公司 One kind suppresses power network subsynchronous resonance method and device based on STATCOM binary channels
CN107895957A (en) * 2017-12-15 2018-04-10 华北电力科学研究院有限责任公司 A kind of subsynchronous resonance and reactive power complex control system and method
US10819262B2 (en) 2017-09-21 2020-10-27 General Electric Company Power generation system, system for suppressing sub-synchronous oscillation and method for controlling operation of power system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10819262B2 (en) 2017-09-21 2020-10-27 General Electric Company Power generation system, system for suppressing sub-synchronous oscillation and method for controlling operation of power system
CN107611998A (en) * 2017-09-22 2018-01-19 中国南方电网有限责任公司 One kind suppresses power network subsynchronous resonance method and device based on STATCOM binary channels
CN107895957A (en) * 2017-12-15 2018-04-10 华北电力科学研究院有限责任公司 A kind of subsynchronous resonance and reactive power complex control system and method

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