CN108134398A - Inhibition fired power generating unit sub-synchronous oscillation method based on current signal feedback - Google Patents
Inhibition fired power generating unit sub-synchronous oscillation method based on current signal feedback Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention belongs to subsynchronous oscillation of electrical power system analyses and suppression technology field, and in particular to a kind of inhibition fired power generating unit sub-synchronous oscillation method based on current signal feedback.Including：Is obtained by current phase angle, abc dq transformation is carried out by angle of transformation of current phase angle, obtains subsynchronous frequency current deviation signal into horizontal lock for AC line current signal based on phaselocked loop；Design static synchronous series compensator SSSC controllers, based on subsynchronous frequency current deviation signal, the damping control circuit of each subsynchronous frequency component is generated by being added in the q axis control loops of the controller, static synchronous series compensator SSSC outputs is made to add subsynchronous voltage to frequency, a positive damping torque is generated in generating set electromagnetic torque.Selecting frequency deviation signal of the present invention can correctly reflect the state of system, enable static synchronous series compensator SSSC according to the severity of sub-synchronous oscillation to be inhibited, realize the purpose for inhibiting sub-synchronous oscillation as extraction signal.
Description
Technical field
The invention belongs to subsynchronous oscillation of electrical power system analyses and suppression technology field, and in particular to one kind is believed based on electric current
Number feedback inhibition fired power generating unit sub-synchronous oscillation method.
Background technology
Subsynchronous Oscillation of Turbine-generator Set (Subsynchronous Oscillation, SSO) is to influence unit and electricity
An important factor for net safe and stable operation, it is that a kind of mechanical-electric coupling oscillation being present between electric power networks and generating set is existing
As.When studying sub-synchronous oscillation SSO, the big axis of generating set is by the equivalent lumped mass block into several elastic connections.Power generation
Each mass block of shaft system of unit is in synchronous rotary, if there is disturbance, it may occur that with respect to torsional oscillation.If system is to this at this time
The damping of torsional oscillation is negative, and generator unit shaft system can constantly torsional oscillation, and torsional oscillation can gradually enhance amplification, eventually lead to shafting
Fatigue damage even be broken.
Turbo-generator Set may cause shaft system of unit with conventional high-tension DC transmission system (LCC-HVDC) interaction
Subsynchronous oscillation, be lost shaft system of unit mechanical life.Large-capacity power electronic device near fired power generating unit may also can draw
Send out the sub-synchronous oscillation of unit, such as Static Var Compensator SVC, static reacance synchronizing generator SVG.
Invention content
In view of the above-mentioned problems, the present invention proposes a kind of inhibition fired power generating unit sub-synchronous oscillation fed back based on current signal
Method, including：
Step 1：Line current phase angle is obtained, with electricity into horizontal lock to AC line current signal based on principle of phase lock loop
It flows phase angle and abc-dq transformation is carried out to three-phase AC line electric current for angle of transformation, obtain subsynchronous frequency current signal, realize and hand over
The extraction of subsynchronous frequency current signal in Flow Line；
Step 2：Static synchronous series compensator SSSC controllers are designed, are believed with the subsynchronous frequency current that step 1 obtains
Number for input signal, on the reference current value in the idle control loop of the static synchronous series compensator SSSC controllers
The additional damping control circuit for generating each subsynchronous frequency component for each subsynchronous frequency component of natural torsional oscillation, passes through
Additional longitudinal forces circuit makes static synchronous series compensator SSSC outputs add subsynchronous voltage to frequency；
Step 3：It is tested according to time-domain-simulation, determines each subsynchronous frequency in static synchronous series compensator SSSC controllers
The parameter in the damping control circuit of component, the parameter in the circuit include the optimal compensation of the subsynchronous frequency of each natural torsional oscillation mode
Phase angle, best phase shift link time constant and best gain constant；The damping control of each subsynchronous frequency component is returned
Road makes static synchronous series compensator SSSC outputs add subsynchronous voltage to frequency, and one is generated in generating set electromagnetic torque
Positive damping torque achievees the purpose that inhibit sub-synchronous oscillation.
The step 1 specifically includes：
Step 1.1：Exchange of the lock phase feedback principle to static synchronous series compensator SSSC installation places based on phaselocked loop
Line current signal obtains line current phase angle theta into horizontal lock0,
AC line current signal is：
Wherein, ImFor AC line current signal amplitude；θ1For actual phase,T is the time, ω1For reality
Frequency,For AC line current signal a phase initial phase angles,
Application lock phase feedback principle is to AC line current into horizontal lock, output current phase angleω0It is right
Should in the synchronous angular velocity of power frequency 50Hz,Output phase is mutually fed back for lock, phase and practical phase are measured when normal steady state is run
Meet relationship θ between position0=θ1；
Step 1.2：The line current phase angle theta being calculated with step 1.10For angle of transformation to three-phase AC line electric current into
Row abc-dq is converted, and obtains iqAs output signal, extraction and conversion to extracted subsynchronous frequency current signal are completed,
Three-phase AC line current signal is with θ0Abc-dq transformation is carried out for angle of transformation, is obtained：
Obtained q axis components are：
By iq(t) amplitude is removed, and obtains output signal and is：
The step 2 specifically includes：The subsynchronous frequency current output variable i obtained from step 1q(t) it inputs static same
Walk series compensator SSSC, the reference current value in idle control loop in static synchronous series compensator SSSC controllers
The upper additional damping control circuit for generating each subsynchronous frequency component, according to the subsynchronous frequency of fired power generating unit shafting nature torsional oscillation
Number determines damping control feeder number, and each damping control circuit corresponds to a subsynchronous frequency of natural torsional oscillation, each to damp
Control loop includes filtering link, blocking link, gain link, phase compensation link composition, to corresponding shafting nature torsional oscillation
Subsynchronous frequency signal carries out feedback control,
Each damping control circuit is for the subsynchronous frequency component f of each natural torsional oscillationi, generated by feedback control additional
Electromagnetic torque Δ T'eSo that itself and Δ TeResultant vector Δ Te" phase angle difference with generator unit shaft system slip Δ ω is in 90 ° of models
In enclosing, a positive damping torque will be generated so as to be fastened in generator rotor shaft, achievees the purpose that inhibit sub-synchronous oscillation.
The step 3 specifically includes：
Step 3.1：Determine the optimal compensation phase angle of each subsynchronous frequency of generator unit shaft system nature torsional oscillation
It establishes generating set and sends power system electromagnetic transient simulation model outside through static synchronous series compensator SSSC, send
Each generating set is held to obtain static synchronous series compensator SSSC using multiple mass model by test and inhibit sub-synchronous oscillation control
The optimal compensation phase angle in device processedfiI-th of natural torsional oscillation for fired power generating unit shafting is subsynchronous
Frequency, fired power generating unit share the n subsynchronous frequency of natural torsional oscillation.
Specific method is：
Respectively with 10 ° for interval, 36 angle, θs are set in the range of 0-360 °j, j=1,2,3 ..., 36, substitute into step
2 obtained static synchronous series compensator SSSC inhibit the phase shift link in sub-synchronous oscillation controller, compare this 36 angles
The inhibition of degree determines best compensation phase angle degree θbest.1；
In θbest.1In the range of positive and negative each inclined 5 ° of angle, best angle is measured again for interval with 1 °；
Determine best compensation phase angle degree θbest.final, θbest.finalThe as subsynchronous frequency of generating set nature torsional oscillation
f1Corresponding the optimal compensation angle；
Test obtains the optimal compensation phase angle of other subsynchronous frequencies of each natural torsional oscillation mode successively
Step 3.2：Determine the damping control circuit of subsynchronous frequency component in static synchronous series compensator SSSC most
Good phase shift link time constant
The structure of static synchronous series compensator SSSC phase compensations is：
For subsynchronous frequency fi, phase supplement link in αiWith TiRespectively：
Wherein, ωi=2 π × fi, fiFor i-th of subsynchronous frequency of natural torsional oscillation；αiWith TiIt is calculated according to formula (6), (7)
It arrives；
Step 3.3：Determine the damping control circuit of each subsynchronous frequency component in static synchronous series compensator SSSC
Optimum gain coefficient
For subsynchronous frequency fi, static synchronous series compensator SSSC inhibit sub-synchronous oscillation controller in gain coefficient
KwiFor：
Wherein, Uq.maxMaximum value for q axis output reference voltages；iq.maxThe subsynchronous frequency current obtained for step 1 is defeated
Go out variable iq(t) maximum current value；I=1,2 ..., n, fired power generating unit shares the n subsynchronous frequency of natural torsional oscillation；Krel.iFor
Safety factor, Krel.iValue is 0.8 or 0.2.
Advantageous effect
The present invention chooses SSSC installation place line current subsynchronous component signals as input variable, can correctly reflect electricity
Sub-synchronous oscillation state in Force system, sub-synchronous oscillation problem is more serious, and input variable signal is bigger, so that static same
Step series compensator SSSC can be inhibited according to the severity of sub-synchronous oscillation；It designs SSSC and inhibits sub-synchronous oscillation
Damping control circuit in controller, the filtered link of each subsynchronous modal frequency signal, blocking link, gain link, phase
Control signal is obtained after the compensation tache of position, control signal controls reference current value by the idle control loops of SSSC, most
A positive electrical damping torque is provided for system eventually, inhibits the development of sub-synchronous oscillation, realizes the mesh for inhibiting sub-synchronous oscillation
's.
Description of the drawings
Fig. 1 is large turbine-generator set through static synchronous series compensator SSSC transmitting system figures；
Fig. 2 turbonator shafting elasticity multimass block models schematic diagrames；
Fig. 3 is the torsion relation schematic diagram of single mass block；
Fig. 4 is into horizontal lock and to extract subsynchronous frequency current signal to AC line current signal based on principle of phase lock loop
Schematic diagram；
Fig. 5 is the structure diagram that static synchronous series compensator SSSC inhibits sub-synchronous oscillation controller；
Fig. 6 is added on the reference current value in idle control loop for static synchronous series compensator SSSC and is generated each time
The damping control circuit diagram of synchronizing frequency component；
Fig. 7 is the phase-frequency characteristic figure of static synchronous series compensator SSSC control loops；
Unit modal graph when Fig. 8 does not put into damping control circuit for static synchronous series compensator SSSC；
Fig. 9 is that static synchronous series compensator SSSC puts into the unit modal graph behind damping control circuit.
Specific embodiment
Below in conjunction with the accompanying drawings, it elaborates to embodiment.
Embodiment 1
As shown in Figure 1, for typical large turbine-generator set through static synchronous series compensator SSSC transmitting systems
It is analyzed, four 600MW firepower Turbo-generator Sets completely send out 2400MW, and the power plants generating electricity unit is by neighbouring high voltage direct current
The sub-synchronous oscillation SSO of shafting may occur for the influence of the factors such as HVDC, exchange string benefit, threaten shaft system of unit safety.The electricity
Factory's generating set is sent out and static synchronous series compensator SSSC is equipped on circuit, and present invention application is sent out static same on circuit
Walk inhibition of the series compensator SSSC realizations to subsynchronous oscillation of generator set.
When studying sub-synchronous oscillation SSO, the big axis of generating set is by the equivalent lumped mass block into several elastic connections.
Each mass block of generator unit shaft system is in synchronous rotary, if there is disturbance, it may occur that with respect to torsional oscillation.If system at this time
Damping to this torsional oscillation is negative, and generator unit shaft system can constantly torsional oscillation, and torsional oscillation can gradually enhance amplification, eventually lead to
The fatigue damage of shafting is even broken.
Turbonator shafting elasticity multimass block models as shown in Fig. 2, lumped mass number of blocks be n, each mass block
Rotary inertia is Mi (i=1,2 ..., n), and each stiffness of a shaft section is ki (i=1,2 ..., n-1), and each mass block of steam turbine is defeated
Enter machine torque for Ti (i=1,2 ..., n), generator output electromagnetic torque is Te, and each mass block mechanical damping is Di,j(i
=1,2 ..., n-1；J=1,2 ..., n-1；(i≤j)), mechanical damping includes mutual between mass block self-damping and adjacent mass
Damping.
The torsion relationship of any of which mass block as shown in figure 3, in described Fig. 3 the left side shaft torque Ki-1,i(θi-1-θi) and
The input quantity Ti of external torque is unidirectional, and accelerating torqueDamping torque D on mass blockiωiIt is and right
The axis square K on sidei,i+1(θi-θi+1) it is negative direction.
The frequency of oscillation of shafting refers in the case where external torque is zero, the natural vibration pattern of shafting.Ignoring machine
In the case that tool damps, the twist motion equation of each mass block is：
Meanwhile
For the shafting containing n mass block, convolution (1), (2), twist motion equation is 2n：
Write formula (3) as matrix formAnd X=[ω 1 ... ω n, θ 1 ... θ n] is enabled,
Then the matrix form of formula (3) is：
For formula (4) class standard state equationIts general solution isWherein, pi=
αi±jωi, α is fade performance, and ω is frequency of oscillation, uiFor piCorresponding right feature vector.For there is the axis of n mass block
, there be n-1 non-zero characteristics root in system, correspond to n-1 shafting torsional oscillation mode, in addition there is 10 value tag root, corresponding shafting rigid body
Therefore mode, the natural mode shape of shafting is obtained by formula (4).Step 1：Extract the letter that subsynchronous oscillation of generator set inhibits
Number
Static synchronous series compensator SSSC inhibits the input signal of sub-synchronous oscillation controller that should include sub-synchronous oscillation
Characteristic information, the signal that can usually take include：1) generator unit shaft system slip Δ ω, static synchronous series compensator SSSC
Installation place a phases busbar voltage, line current, power etc., meanwhile, as the quiet of inhibition subsynchronous oscillation of generator set SSO problems
Series compensator SSSC is only synchronized, input signal should have the feature of realizability and validity.
According to the two indices of realizability and validity, simultaneously because power plant is typically remote from Static Synchronous Series compensation
Device SSSC installation stations, so shafting slip Δ ω can be interfered because of remote conveyor, and usually Static Synchronous Series are mended
Device SSSC sending ends side is repaid nearby there are during multiple power plant, there may be certain interference between slip signal；Static Synchronous Series
Compensator SSSC installation places busbar voltage, power are then since there are larger fluctuations；Simultaneously because Static Synchronous Series compensate
The effect of device SSSC may cause part subsynchronous information to lose and be not suitable for as input signal.
By being analyzed above it is found that static synchronous series compensator SSSC installation places AC line current signal is easy to adopt
Collection, signal characteristic it is apparent, can reflect multiple sub-synchronous oscillation modal components of the multiple Power Plants of sending end, meet more than can be real
Existing property and validity two indices, are best input signals, therefore take static synchronous series compensator SSSC installation places AC line
Road current signal is as input signal.
The method that static synchronous series compensator SSSC is controlled on the spot takes installation place AC line current signal as defeated
Enter signal.Engineering is in practice, secondary same in line current, busbar voltage even more serious sub-synchronous oscillation SSO occurs
Component is walked still much smaller than power frequency component, the detectability of subsynchronous signal is brought greatly for static synchronous series compensator SSSC
Influence, especially when microvariations failure occurs, subsynchronous signal, which is easily submerged in noise, to be difficult to extract, so signal carries
Take link be the key that static synchronous series compensator SSSC design in and difficult point.Meanwhile generator unit shaft system generation is subsynchronous
During oscillation, subsynchronous/supersynchronous current weight, voltage can be generated simultaneously, since supersynchronous analysis frequency is larger, impedance is larger,
The supersynchronous component subsynchronous component that compares is smaller, therefore mainly detects subsynchronous frequency component.
The purpose of static synchronous series compensator SSSC signal extractions is the subsynchronous letter needed for extraction from AC line current
Number, and the signal that can be converted to reflection system mode and control easy to implement is transferred to next link, while extracting
The harmful effect to signal is reduced in journey.
Due to including subsynchronous information in frequency departure signal, it can correctly reflect the state of system, frequency offset energy
The size of subsynchronous component in enough correct reaction systems, sub-synchronous oscillation problem is more serious, and frequency departure is bigger, so that
Static synchronous series compensator SSSC is inhibited according to the severity of sub-synchronous oscillation.Power frequency content is remote in line current
More than subsynchronous component, if taking frequency, subsynchronous component information may be blanked.According to conditions above, it is believed that signal carries
It to construct frequency departure is best to take link, can preferably reach inhibition.
By analyzing above, the present invention select to take line current signal, and as link input signal is extracted, power frequency is inclined
Difference then becomes the key of this link as output for the measurement of frequency departure.
Fig. 4 show based on principle of phase lock loop to AC line current signal into horizontal lock and extracts subsynchronous frequency current
Signal schematic representation, described Fig. 4 are mainly made of two parts, and first part is mutually to be fed back to static synchronous series compensator by lock
SSSC installation places AC line current obtains current phase angle θ into horizontal lock0, this part is mainly completed in line current signal
The extraction of subsynchronous frequency signal；Second part is with θ0Abc-dq transformation is carried out for dq angle of transformation, finally takes iqBelieve as output
Number, the extraction to subsynchronous frequency current signal and conversion are mainly completed in this part, and detailed process is as follows.
Phase-locked loop pll input enables the line current signal be for three-phase AC line current signal：
Wherein, ImFor AC line current signal amplitude；θ1For actual phase,ω1For actual frequency,
For AC line current signal A phase initial phase angles, t is the time；
Line current is exported into horizontal lock based on lock phase feedback principleω0For power frequency 50Hz,For
Lock mutually feeds back output phase.Operation principle is mutually fed back by the lock of phase-locked loop pll it is found that during stable state, measures phase and actual phase
Between meet relationship θ0=θ1；When breaking down, θ0≠θ1, but since subsynchronous component is usually smaller, therefore θ can be approximately considered0≈
θ1。
Lock mutually feeds back output phase θ0Output to next link, three-phase AC line current signal using this output phase as
Abc-dq angle of transformation is converted, and abc-dq transformation is as follows：
Q axis signals, which are calculated, is：
The amplitude of q axis signals is cast out, and is as final output signal：
From expression formula as can be seen that first, (ω is included in formula0-ω1) component, the frequency departure of as required construction, partially
Subsynchronous information is included in difference；Secondly, this process also completes the frequency conversion of exchange AC- direct currents DC.Step 2：It designs static
Synchronous series compensator SSSC inhibits sub-synchronous oscillation controller
Static synchronous series compensator SSSC inhibits sub-synchronous oscillation controller action as shown in figure 5, can both pass through tune
Current reference value processed, the positive electrical damping that subsynchronous frequency range can be also provided by modulation control angle realize that inhibition is subsynchronous
The purpose of oscillation, reasonable design can play good inhibition.
(1) static synchronous series compensator SSSC inhibits the fundamental circuit of sub-synchronous oscillation
Static synchronous series compensator SSSC inhibits the physical arrangement of sub-synchronous oscillation controller as shown in fig. 6, based on step
Rapid 1 obtained subsynchronous frequency current signal, in the idle control loop of the static synchronous series compensator SSSC controllers
In reference current value on add the damping control circuit for generating each subsynchronous frequency component, it is same for each natural torsional oscillation time
Synchronizing frequency component makes the additional subsynchronous frequency electricity of static synchronous series compensator SSSC outputs by additional longitudinal forces circuit
Pressure generates a positive damping torque in generating set electromagnetic torque, achievees the purpose that inhibit sub-synchronous oscillation.
It is controlled since static synchronous series compensator SSSC is consequently exerted on dq axis, for more generating sets of sending end
Sub-synchronous oscillation inhibition is carried out, therefore selects multiple modal frequency parallel-connection structures.The output variable i obtained from step 1q(t) it is defeated
Enter the idle control loop in SSSC control strategies, inhibit sub-synchronous oscillation by the way that reactive power is controlled to generate damping, by attached
Add-back road generates additional electromagnetic torque Δ T'e, so that itself and Δ TeResultant vector Δ Te" with generator unit shaft system slip Δ
The phase angle difference of ω is in the range of 90 °, so as to which system will generate a positive damping torque, reaches the mesh for inhibiting sub-synchronous oscillation
's.
(2) setting of the fundamental circuit parameter of static synchronous series compensator SSSC controllers
When designing static synchronous series compensator SSSC inhibition sub-synchronous oscillation controllers, need to calculate to be compensated frequency
Then phase difference at rate between SSSC input elements and electromagnetic torque passes through static synchronous series compensator SSSC phasings
Link compensates this phase；In the delayed phase that static synchronous series compensator SSSC structures and required compensation is determined,
To obtain the fundamental circuit parameter of static synchronous series compensator SSSC controllers.
1) the optimal compensation phase angle of each subsynchronous frequency of generator unit shaft system nature torsional oscillation is determined
Detailed generating set is established based on PSCAD/EMTDC software platforms to send outside through static synchronous series compensator SSSC
Power system electromagnetic transient simulation model, each generating set of transmitting terminal use multiple mass model.Static Synchronous is obtained by test
Series compensator SSSC inhibits the optimal compensation phase angle in sub-synchronous oscillation controllerFired power generating unit
The subsynchronous frequency of shared n natural torsional oscillation.
Specific method is：
1. to determineFor, respectively with 10 ° for interval, 36 angle, θs are set in the range of 0-360 °j, j=1,
2,3 ..., 36, the phase shift link in the SSSC inhibition sub-synchronous oscillation controllers in PSCAD/EMTDC models is substituted into, compares this
The inhibition of 36 angles determines best compensation phase angle degree θbest.1。
2. in θbest.1In the range of positive and negative each inclined 5 ° of angle, best angle is measured again for interval with 1 °, i.e.,：
Determine best compensation phase angle degree θbest.final, the as subsynchronous frequency f of generating set nature torsional oscillation1It is corresponding
The optimal compensation angle.
3. test obtains the optimal compensation phase angle of other subsynchronous frequencies of each natural torsional oscillation successively
2) determine that static synchronous series compensator SSSC inhibits phase shift link time best in sub-synchronous oscillation controller
Constant
First-order lead, the structure of delay component generally use of static synchronous series compensator SSSC phase compensations are as follows：
For the subsynchronous frequency f of natural torsional oscillationi, phase supplement link in αiWith TnRespectively：
Wherein, ωi=2 π × fi, fiFor i-th of subsynchronous frequency of natural torsional oscillation；αiWith TiIt is calculated according to formula (10), (11)
It obtains；
3) determine that static synchronous series compensator SSSC inhibits gain constant best in sub-synchronous oscillation controller
For the subsynchronous frequency f of natural torsional oscillationi, static synchronous series compensator SSSC inhibit sub-synchronous oscillation controller in
Gain coefficient Kw.iFor：
Wherein, Uq.maxMaximum value for q axis output reference voltages；iq.maxThe subsynchronous frequency current obtained for step 1 is defeated
Go out variable iq(t) maximum current value；I=1,2,3 ..., n, fired power generating unit shares the n subsynchronous frequency of natural torsional oscillation；Krel.i
For safety factor.
Krel.iFor safety factor, for the torsional oscillation mode frequency component that risk is larger, 0.8 is taken；For the smaller torsion of risk
Shake modal frequency component, takes 0.2.
Embodiment 2
In the present embodiment first, Yi Liang power plant using typical generator group as shown in fig. 1 through static synchronous series compensator
SSSC delivery systems, first factory total capacity are 1200MW (2 × 600MW), and second factory total capacity is 1200MW (2 × 600MW), is passed through
500kV circuits send power outside, set send out be installed on circuit the power system capacity of static synchronous series compensator SSSC as
300MW, voltage class 500kV.There are subsynchronous risk, first factory shaft system of unit includes 2 for system Zhong Jia factories, second brand-name computer group
Torsional mode, natural torsion frequency are followed successively by 19.07Hz (mode 1), 23.65Hz (mode 2)；Second factory shaft system of unit includes 2
A torsional mode, natural torsion frequency are followed successively by 12.66Hz (mode 1), 21.28Hz (mode 2).
Static synchronous series compensator SSSC according to the present invention inhibits sub-synchronous oscillation controller design method, is controlled
The transmission function of link processed,
Transfer function Hdamp(s) phase-frequency characteristic is as shown in fig. 7, offset angle and offset angle needed for each mode, such as table 1
It is shown：
1 static synchronous series compensator SSSC controller phase compensation lists of table
| Modal frequency (Hz) | 12.66 | 19.07 | 21.28 | 23.65 |
| Need offset angle | -66.1 | -82.38 | -97.3 | -121.75 |
| Compensate phase angle | -62.1 | -83.1 | -94.5 | -124 |
| Gain | 8.5 | 8.5 | 8.5 | 34.0 |
By Fig. 7 and table 1 it is found that in phase on subsynchronous modal frequency, phase-frequency characteristic meets close to optimal phase shift target
Static synchronous series compensator SSSC design requirements.
Static synchronous series compensator SSSC inhibitions are emulated using PSCAD/EMTDC tools, are existed to system
Large disturbances, the different operating modes of microvariations and static synchronous series compensator SSSC different gains feelings are undergone under the various methods of operation
Condition has carried out simulation analysis.
Setting simulation time is 15s, and first brand-name computer group, second brand-name computer group are full hair, and 4s moment rectification sides ac bus occurs
Singlephase earth fault, trouble duration 0.08s.Fig. 8 a, b are respectively that static synchronous series compensator SSSC is not under failure
Put into damping control circuit Xia Jia factories, second brand-name computer group Modal Decay figure；Fig. 9 a, b are respectively the Static Synchronous Series benefit under failure
Repay device SSSC input damping controls circuit Xia Jia factories, second brand-name computer group Modal Decay figure.
Compare Fig. 8,9 it is found that not put into each Modal Decay during static synchronous series compensator SSSC slow；It puts into static same
After walking series compensator SSSC, each equal Fast Convergent of modal frequency component, it is shown that static synchronous series compensator SSSC is to secondary
Synchronized oscillation has good inhibiting effect.
In the present invention, will in the control strategy of static synchronous series compensator SSSC add subsynchronous oscillation damping it is anti-
Road is fed back to, the subsynchronous oscillation signal of acquisition fired power generating unit shafting carries out feedback control and inhibits sub-synchronous oscillation.It is opposite based on lock
The subsynchronous frequency signal of feedback principle extraction line current is simultaneously converted, and design static synchronous series compensator SSSC inhibits secondary same
Oscillating controller is walked, the filtered link of sub-synchronous oscillation signal, blocking link, gain link, phase compensation link are controlled
Signal processed, control signal are controlled by idle control loop, finally provide a positive electrical resistance for electric generating set rotor
Buddhist nun's torque inhibits the development of sub-synchronous oscillation, realizes the purpose for inhibiting sub-synchronous oscillation.
This embodiment is merely preferred embodiments of the present invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (5)
1. the inhibition fired power generating unit sub-synchronous oscillation method based on current signal feedback, which is characterized in that including：
Step 1：Line current phase angle is obtained, with electric current phase into horizontal lock to AC line current signal based on principle of phase lock loop
Angle carries out abc-dq transformation for angle of transformation to three-phase AC line electric current, obtains subsynchronous frequency current signal, realizes AC line
The extraction of subsynchronous frequency current signal in road；
Step 2：Design static synchronous series compensator SSSC controllers, using the subsynchronous frequency current signal that step 1 obtains as
Input signal is added on the reference current value in the idle control loop of the static synchronous series compensator SSSC controllers
The damping control circuit of each subsynchronous frequency component is generated, for each subsynchronous frequency component of natural torsional oscillation, by additional
Damping control circuit makes static synchronous series compensator SSSC outputs add subsynchronous voltage to frequency；
Step 3：It is tested according to time-domain-simulation, determines each subsynchronous frequency component in static synchronous series compensator SSSC controllers
Damping control circuit parameter, the parameter in the circuit includes the optimal compensation phase of the subsynchronous frequency of each natural torsional oscillation mode
Angle, best phase shift link time constant and best gain constant；The damping control circuit of each subsynchronous frequency component makes
Static synchronous series compensator SSSC outputs add subsynchronous voltage to frequency, generated in generating set electromagnetic torque one it is positive
Damping torque achievees the purpose that inhibit sub-synchronous oscillation.
2. the inhibition fired power generating unit sub-synchronous oscillation method according to claim 1 based on current signal feedback, feature
It is, the step 1 specifically includes：
Step 1.1：Lock phase feedback principle based on phaselocked loop is to the alternating current circuit of static synchronous series compensator SSSC installation places
Current signal obtains line current phase angle theta into horizontal lock0,
AC line current signal is：
Wherein, ImFor AC line current signal amplitude；θ1For actual phase,T is the time, ω1For practical frequency
Rate,For AC line current signal a phase initial phase angles,
Application lock phase feedback principle is to AC line current into horizontal lock, output current phase angleω0To correspond to
The synchronous angular velocity of power frequency 50Hz,Mutually feed back output phase for lock, measured when normal steady state is run phase and actual phase it
Between meet relationship θ0=θ1；
Step 1.2：The line current phase angle theta being calculated with step 1.10Three-phase AC line electric current is carried out for angle of transformation
Abc-dq is converted, and obtains iqAs output signal, extraction and conversion to extracted subsynchronous frequency current signal are completed,
Three-phase AC line current signal is with θ0Abc-dq transformation is carried out for angle of transformation, is obtained：
Obtained q axis components are：
By iq(t) amplitude is removed, and obtains output signal and is：
3. the inhibition fired power generating unit sub-synchronous oscillation method according to claim 1 based on current signal feedback, feature
It is, the step 2 specifically includes：The subsynchronous frequency current output variable i obtained from step 1q(t) Static Synchronous string is inputted
Join compensator SSSC, it is attached on the reference current value in idle control loop in static synchronous series compensator SSSC controllers
Add the damping control circuit for generating each subsynchronous frequency component, according to the number of the subsynchronous frequency of fired power generating unit shafting nature torsional oscillation
Determine damping control feeder number, each damping control circuit corresponds to a subsynchronous frequency of natural torsional oscillation, each damping control
Circuit includes filtering link, blocking link, gain link, phase compensation link composition, same to corresponding shafting nature torsional oscillation time
Synchronizing frequency signal carries out feedback control,
Each damping control circuit is for the subsynchronous frequency component f of each natural torsional oscillationi, additional electromagnetic is generated by feedback control
Torque Δ T 'eSo that itself and Δ TeResultant vector Δ Te" phase angle difference with generator unit shaft system slip Δ ω is in 90 ° of ranges
It is interior, a positive damping torque will be generated so as to be fastened in generator rotor shaft, achievees the purpose that inhibit sub-synchronous oscillation.
4. the inhibition fired power generating unit sub-synchronous oscillation method according to claim 1 based on current signal feedback, feature
It is, the step 3 specifically includes：
Step 3.1：Determine the optimal compensation phase angle of each subsynchronous frequency of generator unit shaft system nature torsional oscillation
It establishes generating set and sends power system electromagnetic transient simulation model outside through static synchronous series compensator SSSC, transmitting terminal is each
Generating set uses multiple mass model, and obtaining static synchronous series compensator SSSC by test inhibits sub-synchronous oscillation controller
In the optimal compensation phase angleI=1,2 ..., n, fiI-th of subsynchronous frequency of natural torsional oscillation for fired power generating unit shafting
Rate, fired power generating unit share the n subsynchronous frequency of natural torsional oscillation.
Specific method is：
Respectively with 10 ° for interval, 36 angle, θs are set in the range of 0-360 °j, j=1,2,3 ..., 36, it substitutes into obtained by step 2
To static synchronous series compensator SSSC inhibit sub-synchronous oscillation controller in phase shift link, compare the suppression of this 36 angles
Effect processed determines best compensation phase angle degree θbest.1；
In θbest.1In the range of positive and negative each inclined 5 ° of angle, best angle is measured again for interval with 1 °；
Determine best compensation phase angle degree θbest.final, θbest.finalThe as subsynchronous frequency f of generating set nature torsional oscillation1It is right
The optimal compensation angle answered；
Test obtains the optimal compensation phase angle of other subsynchronous frequencies of each natural torsional oscillation mode successivelyI=1,
2,...,n；
Step 3.2：Determine the best phase in the damping control circuit of subsynchronous frequency component in static synchronous series compensator SSSC
Move link time constant
The structure of static synchronous series compensator SSSC phase compensations is：
For subsynchronous frequency fi, phase supplement link in αiWith TiRespectively：
Wherein, ωi=2 π × fi, fiFor i-th of subsynchronous frequency of natural torsional oscillation；αiWith TiIt is calculated according to formula (6), (7)；
Step 3.3：Determine the best of the damping control circuit of each subsynchronous frequency component in static synchronous series compensator SSSC
Gain coefficient
For subsynchronous frequency fi, static synchronous series compensator SSSC inhibit sub-synchronous oscillation controller in gain coefficient Kw.i
For：
Wherein, Uq.maxMaximum value for q axis output reference voltages；iq.maxThe subsynchronous frequency current obtained for step 1 exports change
Measure iq(t) maximum current value；I=1,2 ..., n, fired power generating unit shares the n subsynchronous frequency of natural torsional oscillation；Krel.iIt is reliable
Coefficient.
5. the inhibition fired power generating unit sub-synchronous oscillation method according to claim 4 based on current signal feedback, feature
It is, Krel.iValue is 0.8 or 0.2.
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