CN107895957A - A kind of subsynchronous resonance and reactive power complex control system and method - Google Patents
A kind of subsynchronous resonance and reactive power complex control system and method Download PDFInfo
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- CN107895957A CN107895957A CN201711346553.2A CN201711346553A CN107895957A CN 107895957 A CN107895957 A CN 107895957A CN 201711346553 A CN201711346553 A CN 201711346553A CN 107895957 A CN107895957 A CN 107895957A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention provides a kind of subsynchronous resonance and reactive power complex control system and method, collect the difficulty of areas comprehensive control for current large-scale wind power, according to the initial detecting signal of subsynchronous resonance signal, the busbar voltage of wind-powered electricity generation compensated transmission system and reactive power, judge the state of wind-powered electricity generation compensated transmission system, and then according to the priority orders of event handling.Pass through subsynchronous resonance provided by the invention and reactive power integrated control method and system, make full use of capacity, the distribution of dynamic regulation place capacity, improve utilization rate of equipment and installations, the safe and stable operation of wind-powered electricity generation compensated transmission system is ensured, solve the difficult double risks with subsynchronous resonance of voltage-regulation in the prior art simultaneously, need to collect area installation dynamic passive compensation equipment in wind-powered electricity generation, a problem of other resonance suppresses equipment to be also installed simultaneously, equipment investment is greatly saved, saves transformer station's floor space.
Description
Technical field
The present invention relates to wind-powered electricity generation-compensated transmission system field, more particularly to a kind of subsynchronous resonance and reactive power synthesis
Control system and method.
Background technology
In terms of reactive power/voltage control, foreign scholar point out Wind turbines be incorporated into the power networks caused by voltage pulsation come from its ripple
Dynamic power output, and the fluctuation of power output is mainly missed by the quick shift and tower shadow effect of wind speed, wind shear, driftage
Caused by the factors such as difference.Domestic scholars cause Network Voltage Deviation and the principle of voltage pulsation to carry out in wind power plant access power network
Analysis, it is proposed that the method for the wind farm grid-connected caused system voltage fluctuation of analysis is calculated with probabilistic loadflow, and is ground above-mentioned
On the basis of studying carefully, the Reactive Compensation in Wind Farm Optimizing Suggestions for suppressing voltage pulsation are given.
State Grid Jibei Electric Power Co., Ltd. also collects regional voltage frequent fluctuation problem for wind-powered electricity generation and tentatively grind
Study carefully.Point out that Guyuan, Chengde area integrated wind plant focus primarily upon power network end, have thin away from load center, grid structure
It is weak, send out distance the features such as be cause wind power plant node voltage fluctuate quite sensitive the reason for one of, and to wind power plant adjust
The common factors for easily causing electric voltage exception to fluctuate such as main transformer tap, switched capacitor, blower fan low-voltage off-grid, air-drop transformer
Also initial analysis is had been carried out.
In terms of resonance braking measure, domestic and foreign scholars have carried out the braking measure research of three aspects, respectively change electricity
Network operation mode, blower fan lateral inhibition measure and grid side braking measure.Foreign scholar is in blower fan grid side converter voltage control loop
Middle additional longitudinal forces discuss to suppress resonance and how to select feedback signal and the optimal point of addition of determination.Utilize FACTS
(flexible AC transmitting system) controller suppresses the extensive concern that resonance also result in domestic and foreign scholars, it is proposed that STATCOM is (quiet
Only synchronous compensator), SVC (static passive compensation device) or UPFC (THE UPFC) additional longitudinal forces method.
The measure that Guyuan area uses at present is to occur to exit a set of string benefit during resonance, but the frequent operation mended to string is easy
Equipment damage is caused, and unnecessary impact is produced to power network, deteriorates the quality of power supply, therefore interim operation measures can only be used as.
Ji north DianKeYuan and Tsing-Hua University have also carried out the research in terms of a large amount of braking measures, it is proposed that blower fan side-embedded suppression filter
Ripple device and grid side-active energy absorption-type suppressor, and the simulating, verifying based on Guyuan system its validity.
In summary, collect regional reactive power/voltage control to wind-powered electricity generation both at home and abroad at present and resonance is administered and all achieves one respectively
A little achievements in research, but the two is all independent development.Large-scale wind power collects area to face voltage-regulation difficult and time same at present
The double risks of resonance are walked, according to prior art, it is necessary to which collecting area in wind-powered electricity generation installs dynamic passive compensation equipment additional, while also
An other resonance is installed suppresses equipment, significant wastage equipment investment and transformer station's floor space.
The content of the invention
The present invention provides a kind of subsynchronous resonance and reactive power complex control system and method, to ensure that wind-powered electricity generation collects ground
The power network safety operation in area provides feasible scheme.
To achieve these goals, the invention provides a kind of subsynchronous resonance and reactive power complex control system, bag
Include：Signal measurement apparatus, static reacance generator and subsynchronous resonance suppressor；
The signal measurement apparatus, for obtaining the bus electricity comprising subsynchronous resonance signal, wind-powered electricity generation-compensated transmission system
The initial detecting signal of pressure and reactive power, and judge based on the initial detecting signal state of wind-powered electricity generation-compensated transmission system,
To carry out the sequential adjustment of the busbar voltage, the reactive power and the subsynchronous resonance signal；
The static reacance generator, for receiving the regulation busbar voltage and the institute that the signal measurement apparatus is sent
The signal of reactive power is stated, the first signal after regulation is sent to the bus of wind-powered electricity generation-compensated transmission system；
The subsynchronous resonance suppressor, the suppression subsynchronous resonance sent for receiving the signal measurement apparatus
The signal of signal, the secondary signal after suppression is sent to the static reacance generator.
In one embodiment, the subsynchronous resonance suppressor includes：Wave filter, phase shift link, reference value calculator.
The invention provides a kind of subsynchronous resonance and reactive power complex control system, including including：Signal measurement fills
Put, static reacance generator and subsynchronous resonance suppressor.The signal measurement apparatus, believe for obtaining comprising subsynchronous resonance
Number, the initial detecting signal of the busbar voltage of wind-powered electricity generation-compensated transmission system and reactive power, and be based on the initial detecting signal
The state of wind-powered electricity generation-compensated transmission system is judged, to carry out the busbar voltage, the reactive power and the subsynchronous resonance
The sequential adjustment of signal.The static reacance generator, the regulation bus sent for receiving the signal measurement apparatus
The signal of voltage and the reactive power, the first signal after regulation is sent to the bus of wind-powered electricity generation-compensated transmission system.It is described
Subsynchronous resonance suppressor, the signal of the suppression subsynchronous resonance signal sent for receiving the signal measurement apparatus,
Secondary signal after suppression is sent to the static reacance generator.Subsynchronous resonance provided by the invention and reactive power are comprehensive
Control system is closed, on the basis of original static reacance generator, adds subsynchronous resonance suppressor and signal measurement apparatus,
Solve the double risks of voltage-regulation difficulty and subsynchronous resonance in the prior art and install dynamic additional, it is necessary to collect area in wind-powered electricity generation
Reactive-load compensation equipment, while a problem of other resonance suppresses equipment to be also installed, equipment investment is greatly saved, saves power transformation
Stand floor space.
According to above-mentioned subsynchronous resonance and reactive power complex control system, present invention also offers a kind of subsynchronous resonance
And reactive power integrated control method, including：
Obtain the initial inspection for including subsynchronous resonance signal, the busbar voltage of wind-powered electricity generation-compensated transmission system and reactive power
Survey signal；
The state of wind-powered electricity generation-compensated transmission system is judged according to the initial detecting signal；
If the state of the wind-powered electricity generation-compensated transmission system is abnormality, the wind-powered electricity generation-compensated transmission system is carried out
Abnormality processing.
In one embodiment, the state that wind-powered electricity generation-compensated transmission system is judged according to the initial detecting signal, bag
Include：
According to the priority orders of event handling by the subsynchronous resonance signal in the initial detecting signal, wind-powered electricity generation-string
The busbar voltage and reactive power of benefit transmission system are compared with corresponding reference value, to judge wind-powered electricity generation-compensated transmission system
State it is whether abnormal.
In one embodiment, the event handling includes subsynchronous phenomenon suppression/elimination, and wind-powered electricity generation-string mends transmission of electricity
The regulation of the busbar voltage and reactive power of system, the priority orders are big for the priority of subsynchronous phenomenon suppression/elimination
In the priority that the busbar voltage and reactive power of wind-powered electricity generation-compensated transmission system are adjusted；
According to the priority orders of the event handling by the subsynchronous resonance signal in the initial detecting signal, wind
The busbar voltage and reactive power of electricity-compensated transmission system compared with corresponding reference value, including：
By the subsynchronous resonance signal compared with corresponding reference value, judge whether subsynchronous resonance phenomenon is different
Often, when synchronous resonant phenomenon is normal or the subsynchronous signal is suppressed or is eliminated and then wind-powered electricity generation-string is mended into transmission of electricity
The busbar voltage of the busbar voltage and reactive power of system judgement wind-powered electricity generation-compensated transmission system compared with corresponding reference value
And whether reactive power is abnormal.
In one embodiment, it is described to the wind-powered electricity generation-compensated transmission system progress abnormality processing, including：To described time
Synchronous resonant signal is suppressed or eliminated, and the busbar voltage or reactive power of wind-powered electricity generation-compensated transmission system are adjusted
Section.
In one embodiment, it is described the subsynchronous resonance signal is suppressed or eliminate including：
Calculate the capacity needed for the suppression subsynchronous resonance signal；
Startup subsynchronous resonance suppressor sends suppression electric current and the subsynchronous resonance signal is suppressed or eliminated.
In one embodiment, the busbar voltage or reactive power to wind-powered electricity generation-compensated transmission system is adjusted, bag
Include：
Check whether the capacity of subsynchronous resonance and reactive power complex control system is sufficient；
If it is, control static reacance generator is actuated for the smooth adjustment of busbar voltage and reactive power.
In one embodiment, if subsynchronous resonance and reactive power complex control system off-capacity, in addition to：
While the static reacance generator starts, compensation capacity is asked not to other wind-powered electricity generations-compensated transmission system
The part of foot.
The invention provides a kind of subsynchronous resonance and reactive power integrated control method, by obtaining comprising subsynchronous humorous
The initial detecting signal for signal, wind-powered electricity generation-compensated transmission system busbar voltage and the reactive power of shaking, believe according to the initial detecting
The state of wind-powered electricity generation-compensated transmission system number is judged, if the state of the wind-powered electricity generation-compensated transmission system is abnormality, to institute
State wind-powered electricity generation-compensated transmission system and carry out abnormality processing.Pass through subsynchronous resonance provided by the invention and reactive power Comprehensive Control
Method, by the priority orders to event handling, capacity is made full use of, the distribution of dynamic regulation place capacity, improves equipment
Utilization rate, the safe and stable operation of wind-powered electricity generation-compensated transmission system is ensured.
The invention provides a kind of subsynchronous resonance and reactive power complex control system and method, for extensive at present
Wind-powered electricity generation collects the difficulty of areas comprehensive control, according to subsynchronous resonance signal, wind-powered electricity generation-compensated transmission system busbar voltage and idle
The initial detecting signal of power, judge the state of wind-powered electricity generation-compensated transmission system, and then according to the priority orders of event handling.
By subsynchronous resonance provided by the invention and reactive power integrated control method and system, capacity, dynamic regulation are made full use of
The distribution of place capacity, utilization rate of equipment and installations is improved, the safe and stable operation of wind-powered electricity generation-compensated transmission system has been ensured, has solved simultaneously
Voltage-regulation is difficult in the prior art and the double risks of subsynchronous resonance install dynamic reactive additional, it is necessary to collect area in wind-powered electricity generation
Equipment is compensated, while a problem of other resonance suppresses equipment to be also installed, is greatly saved equipment investment, transformer station is saved and accounts for
Ground area.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is a kind of subsynchronous resonance provided by the invention and the structural representation of reactive power complex control system；
Fig. 2 is the subsynchronous resonance of one embodiment of the invention and the structural representation of reactive power complex control system；
Fig. 3 is the converters schematic diagram of one embodiment of the invention；
Fig. 4 is the converters equivalent circuit diagram of one embodiment of the invention；
Fig. 5 is the converters voltage and current relationship figure of one embodiment of the invention；
Fig. 6 is the flow chart of a kind of subsynchronous resonance and reactive power integrated control method provided by the invention；
Fig. 7 is the flow chart of the subsynchronous resonance and reactive power integrated control method of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
For needing to collect area installation dynamic passive compensation equipment in wind-powered electricity generation in the prior art, while also to install in addition
One resonance suppresses equipment, and the problem of significant wastage equipment investment and transformer station's floor space, the invention provides a kind of time
Synchronous resonant and reactive power complex control system, as shown in figure 1, the subsynchronous resonance and reactive power complex control system 1
Including：Signal measurement apparatus, static reacance generator and subsynchronous resonance suppressor.
Fig. 2 is the subsynchronous resonance and reactive power complex control system structural representation of the embodiment of the application one, wherein 1
It is wind-powered electricity generation-compensated transmission system bus for subsynchronous resonance and reactive power complex control system, 2,3 be static reacance
Device, 4 be subsynchronous resonance suppressor, and 5 be the busbar voltage and reactive power controller of static reacance generator.As shown in Fig. 2
Subsynchronous resonance and reactive power complex control system 1 are at static reacance generator 3 (Static Var Generator, SVG)
On the basis of add subsynchronous resonance (SubSynchronousResonance, SSR) suppressor 4 and signal measurement apparatus, and
SVG busbar voltage and the branch road of reactive power controller 5 are not changed, and the present invention makes static reacance generator while has nothing concurrently
Work(and voltage-regulation and the function of sub-synchronous oscillation suppressor (SubSynchronous Resonance Damper, SSD).It is secondary
The initial detecting signals such as synchronous resonant signal, the busbar voltage of wind-powered electricity generation-compensated transmission system and reactive power by one group of wind-powered electricity generation-
Voltage, the current transformer of compensated transmission system bus 2 introduce signal measurement apparatus.Signal measurement apparatus is by comparing detected value
Judge whether wind-powered electricity generation-compensated transmission system state is normal with reference value.When unusual condition occurs in system, signal measurement apparatus is excellent
First selection suppresses subsynchronous resonance signal.Signal measurement apparatus calculates the capacity suppressed needed for subsynchronous resonance signal first, with
Start subsynchronous resonance suppressor afterwards and send suppression electric current.When subsynchronous resonance phenomenon is inhibited or eliminated, signal measurement
Device and then the voltage of bus 2 and reactive power signals for handling wind-powered electricity generation-compensated transmission system.When busbar voltage or reactive power need
When adjusting, signal measurement apparatus need to check place capacity, and in the case where capacity is enough, signal measurement apparatus makes SVG start
And then smoothly adjust reactive power；In off-capacity, signal measurement apparatus sends information, subsynchronous resonance and reactive power
While the SVG of complex control system starts, the part of the reactive power compensator compensation capacity deficiency on other buses is asked.When
When subsynchronous resonance does not occur for subsynchronous resonance and reactive power complex control system, signal measurement apparatus directly handles bus electricity
Pressure, reactive power detection signal, all told are used to adjust busbar voltage and reactive power.Now, subsynchronous resonance and idle
Power complex control system plays SVG effect completely.Above-mentioned reactive power compensator refers to the equipment with no-power compensation function,
Such as synchronous capacitor, SVC, static reacance generator etc., static reacance generator are one of which, one
As be connected in parallel on the bus of wind-powered electricity generation-compensated transmission system.
Signal measurement apparatus, as shown in Fig. 2 the initial detecting signal of the bus for obtaining wind-powered electricity generation-compensated transmission system,
And initial detecting signal is based on, send first signal to the static reacance generator and sent out to subsynchronous resonance suppressor
Send the secondary signal.Wherein, initial detecting signal includes subsynchronous resonance signal, wind-powered electricity generation-compensated transmission system busbar voltage
With reactive power etc., the present invention is not limited.Signal measurement apparatus major function is to choose suitable feedback signal as secondary
The input signal of synchronous resonant suppressor, the feedback signal should include the information of wind-powered electricity generation-compensated transmission system subsynchronous resonance suppression
And it is easy to extract and measures.Feedback signal includes the current signal i of wind-powered electricity generation-compensated transmission systemLWith the electricity at serial compensation capacitance both ends
Press signal vC。
Static reacance generator 3, as shown in Fig. 2 initial detecting signal is sent by reception signal measurement apparatus, according to first
Beginning detection signal carries out the regulation of busbar voltage and reactive power, and the signal after regulation is sent into wind-powered electricity generation-compensated transmission system
Bus in, realize the static reacance adjustment effect to wind-powered electricity generation-compensated transmission system.
Subsynchronous resonance suppressor 4, as shown in Fig. 2 the initial detecting signal sent by reception signal measurement apparatus, suppression
Subsynchronous resonance processed, the second Regulate signal is sent to the static reacance generator.Subsynchronous resonance suppressor is connected in parallel on static
In reacance generator, the basic functional principle of subsynchronous resonance suppressor is, by rationally designing subsynchronous resonance suppressor, to make
It produces the reference current signal directly proportional to wind-powered electricity generation-compensated transmission system voltage subsynchronous component, and the reference current signal is defeated
Enter to the real subsynchronous electric current of generation in static reacance generator is connected in parallel on, the subsynchronous electric current is injected into wind-powered electricity generation-string mends
In transmission system, inhibitory action is played to the subsynchronous resonance in wind-powered electricity generation-compensated transmission system.In time that subsynchronous resonance occurs
At synchronizing frequency, the subsynchronous resonance suppressor being connected in parallel in static reacance generator should be equivalent to pure electricity in the line in parallel
Resistance, consumption resonant energy suppress subsynchronous resonance, and at power frequency, subsynchronous resonance of the parallel connection type in static reacance generator
Suppressor is equivalent to open a way, and ensures that the power frequency working condition of wind-powered electricity generation-compensated transmission system is constant.
In one embodiment, as shown in Fig. 2 subsynchronous resonance suppressor 4 is specially subsynchronous damper, subsynchronous resistance
Buddhist nun's device is made up of units such as wave filter, phase shift link and reference value calculators.
Due to signal measurement apparatus output signal include wind-powered electricity generation-compensated transmission system in subsynchronous resonance information and
Be easy to extract and measure, thus subsynchronous damper choose measurement apparatus output signal in subsynchronous component as subsynchronous resistance
Buddhist nun's device input signal.The output signal of signal measurement apparatus has the current signal i of series compensated transmission lineLWith serial compensation capacitance both ends
Voltage signal vC, by the signal of signal measurement apparatus processing, it is input to filter cell.The function of filter cell is to filter out
Subsynchronous current component i in the current signal of the series compensated transmission line of wind-powered electricity generation-compensated transmission systemSSROr wind-powered electricity generation-string mends transmission of electricity
The voltage signal v at the serial compensation capacitance both ends of systemSSRIn subsynchronous component.Filter cell is realized using composite filter group
Filter function.Composite filter group is made up of power frequency bandstop filter and low frequency bandpass filter.Composite filter group can be accurate
Subsynchronous component really is extracted, and can avoids subsynchronous damper from exporting unwanted power frequency component.
The transmission function of power frequency bandstop filter is
The transmission function of low frequency bandpass filter is
ξBRRepresent the damping ratio of bandstop filter；
ξBPRepresent the damping ratio of bandpass filter；
ωBRRepresent the gating frequency of bandstop filter；
ωBPRepresent the gating frequency of bandpass filter；
The function of phase shift link unit is compensated because composite filter design is unreasonable, caused that target pattern is vibrated
Phase shift caused by signal.If wave filter design is unreasonable, SSR inhibitions can be influenceed, it is therefore desirable in subsynchronous damper
In phase shift link unit do appropriate compensation.
The typical expression formula of phase shift link unit is as follows：
Ts represents time constant；
N is positive integer, represents n phase shift link unit series connection.
In order to improve wind-powered electricity generation-compensated transmission system to SSR inhibition, it is necessary to be carried out to the parameter of subsynchronous damper
Design.Main target is by rationally designing phase shift link time constant value, and compensating filter link produces to subsynchronous signal
Phase shift, while ensure the stable operation of whole closed-loop system after wind-powered electricity generation-compensated transmission system input.
By the signal of phase shift link, input reference unit calculator.The function of reference value unit calculator is to calculate
Go out the reference current signal directly proportional to wind-powered electricity generation-compensated transmission system voltage subsynchronous component.Typical expression formula is as follows：
If consume resonant energy caused by negative resistance, wind-powered electricity generation-compensated transmission system using the subsynchronous damper of design
With regard to that can keep stable.Subsynchronous damper injects subsynchronous electric current to wind-powered electricity generation-compensated transmission system, can be equivalent to the electric current of parallel connection
Source i.At subsynchronous frequency, its impedance operator sees below formula：
Subsynchronous damper reasonable in design can make the X ≈ 0 in above formula, R ＞ 0, and R obtain maximum, so as to for wind-powered electricity generation-
Compensated transmission system provides positive damping.
As shown in Fig. 2 by the signal of reference value computing unit, the impulse generator of static reacance generator is input to.
Because wind-powered electricity generation-compensated transmission system capacity is generally large, in order to ensure the control effect of subsynchronous damper, to its capacity requirement
Also it is higher, generally it is also contemplated that certain design capacity.There are multiple choices at present to realize high-voltage large-capacity, more commonly used knot
Structure has devices in series, using transformer multiple inverter configuration and chain structure, and chain structure is used in the present embodiment.Chain structure has
Have by the way that multiple elementary cells are together in series, directly obtain very high ac output voltage, and be easy to modularized design
And Redundant Control, substantially increase reliability.
In one embodiment, as shown in Fig. 2 static reacance generator 3 includes busbar voltage and reactive power controller
5th, the unit such as impulse generator and converters.
Busbar voltage and reactive power controller 5, when subsynchronous phenomenon is inhibited or eliminated, processing wind-powered electricity generation-string is mended
The busbar voltage and reactive power of transmission system.When busbar voltage or reactive power need regulation, busbar voltage and idle work(
Rate controller need to check subsynchronous resonance and the capacity of reactive power complex control system, in the case where capacity is enough, bus
Voltage and reactive power controller make SVG start and then smoothly adjust reactive power；In off-capacity, busbar voltage and nothing
While work(power controller sends letter startup SVG information, the reactive power compensator compensation capacity deficiency on other buses is asked
Part.When subsynchronous resonance does not occur for subsynchronous resonance and reactive power complex control system, busbar voltage and idle work(
Rate controller directly handles the busbar voltage and reactive power of wind-powered electricity generation-compensated transmission system, and all told is used to adjust bus electricity
Pressure and reactive power.Now, subsynchronous resonance and reactive power complex control system play SVG effect completely.
Impulse generator, for generating the voltage signal required for converters, sine wave is become into pulse side
Ripple.
Converters, for subsynchronous damper to be generated to the reference directly proportional to system voltage subsynchronous component
Current signal produces real subsynchronous electric current, and the subsynchronous electric current is injected into the bus 2 of wind-powered electricity generation-compensated transmission system,
Damping action is played to the SSR of wind-powered electricity generation-compensated transmission system.
Converters are specially a kind of fully-controlled type active type reacance generator, send to dynamic and absorb idle
Power.Fig. 3 is the structural representation of converters.Fig. 3 is converters schematic diagram.As shown in figure 3, electric power
Electronic converter is by multiple IGBT (Insulated Gate Bipolar Transistor) in parallel with capacitor group of 6 components
Into from commutation bridge circuit 7, it is connected in parallel on from commutation bridge circuit 7 by reactor in wind-powered electricity generation-compensated transmission system.Reactor 8
Effectively higher hamonic wave derived from suppression converters switching frequency ripple current can be suppressed, make Technics of Power Electronic Conversion
The reactive power of device output can be more smooth, prevents from breaking down because of dash current.Bridge circuit connects to form more level knots
Structure, bridge circuit control each angle of flow to produce the staircase waveform close to sine wave.
Fig. 4 is converters equivalent circuit diagram.As shown in figure 4, L in the equivalent circuit diagram of converters
For link reactor, R be equivalent bridge circuit and reactor loss, U1, I be respectively the output voltage of bridge circuit, electricity
Stream, USFor the voltage of wind-powered electricity generation-compensated transmission system.Wherein, bridge circuit can be equivalent to that amplitude and phase be controllable and wind
The alternating-current voltage source of electricity-compensated transmission system same frequency.Adjust AC output voltage phase and amplitude, it is possible to control electric power
Electronic converter absorbs and sent reactive power.
Fig. 5 is converters electric current and voltage relationship figure.As shown in figure 5, the electric current of converters, electricity
In pressure relationTo link reactor impedance angle；δ is U1And USPhase difference.ULFor voltage vector on inductance L and resistance R and；I is
The electric current on inductance L and resistance R is flowed through, I is also the electric current that converters absorb from wind-powered electricity generation-compensated transmission system side.
Work as U1＞ USWhen, as shown in Figure 5 a, electric current is ahead of voltage, and converters are in capacitive mode of operation, electricity
Power electronic converter sends reactive power；Work as U1＜ USWhen, as shown in Figure 5 b, electric current I lags behind voltage U1, Technics of Power Electronic Conversion
Device is in perceptual mode of operation, and converters are from wind-powered electricity generation-compensated transmission system absorbing reactive power.
The sub-synchronous oscillation suppressor for suppressing resonance is integrated in a set of equipment by the present apparatus with SVG, passes through a set of measurement
Device obtains the signal of SSD needs and voltage, the current signal of SVG controls simultaneously, and by signal measurement apparatus reasonably
Coordinate two big functions, reduce equipment investment, reduce occupation area of equipment, improve utilization rate of equipment and installations.
In the embodiment of the present invention, there is provided one kind is based on subsynchronous resonance proposed by the present invention and reactive power Comprehensive Control
The method of system, its FB(flow block) is as shown in fig. 6, comprise the following steps：
S11：Obtain comprising the first of subsynchronous resonance signal, the busbar voltage of wind-powered electricity generation-compensated transmission system and reactive power
Beginning detection signal；
S12：The state of wind-powered electricity generation-compensated transmission system is judged according to the initial detecting signal；
S13：If the state of the wind-powered electricity generation-compensated transmission system is abnormality, to the wind-powered electricity generation-compensated transmission system
Carry out abnormality processing.
Flow as shown in Figure 6 understands that present invention basis includes subsynchronous resonance signal, busbar voltage and reactive power
Initial detecting signal judges the state of wind-powered electricity generation-compensated transmission system, and in the abnormal state shape of the wind-powered electricity generation-compensated transmission system
During state, abnormality processing is carried out to the wind-powered electricity generation-compensated transmission system.The present invention can obtain subsynchronous resonance signal, wind simultaneously
The busbar voltage and reactive power of electricity-compensated transmission system, realize that Simultaneous Monitoring and processing subsynchronous resonance, wind-powered electricity generation-string benefit are defeated
The busbar voltage and reactive power fluctuation of electric system, have the work(of busbar voltage and reactive power/voltage control and subsynchronous resonance improvement concurrently
Can, provide reliable support to ensure that wind-powered electricity generation collects regional power network safety operation.
In above-mentioned steps S11, the subsynchronous resonance signal in initial detecting signal corresponds to subsynchronous resonance phenomenon, bus electricity
The busbar voltage that pressure signal corresponds to wind-powered electricity generation-compensated transmission system is horizontal, and reactive power signals correspond to reactive power level.
In one embodiment, in above-mentioned steps S12, judge that wind-powered electricity generation-string mends transmission of electricity system according to the initial detecting signal
During the state of system, can according to the priority orders of event handling by the subsynchronous resonance signal in the initial detecting signal,
Bus voltage signal and reactive power signals are compared with corresponding reference value, to judge the shape of wind-powered electricity generation-compensated transmission system
Whether state is abnormal.
Event handling includes subsynchronous phenomenon suppression/elimination (corresponding to subsynchronous resonance signal), and wind-powered electricity generation-string mend it is defeated
Busbar voltage and the reactive power regulation of electric system (correspond to the busbar voltage and reactive power water of wind-powered electricity generation-compensated transmission system
It is flat).
Priority orders are more than the bus electricity of wind-powered electricity generation-compensated transmission system for the priority of subsynchronous phenomenon suppression/elimination
Pressure and the priority of reactive power regulation, the present invention are not limited.In the present embodiment, signal measurement apparatus is needed institute first
Subsynchronous resonance signal is stated compared with corresponding reference value, judges whether subsynchronous resonance phenomenon is abnormal.
When subsynchronous resonance phenomenon is normal in wind-powered electricity generation-compensated transmission system, or subsynchronous resonance phenomenon is abnormal, and in wind
After subsynchronous signal is suppressed or eliminated described in electricity-compensated transmission system, signal measurement apparatus is again by wind power plant bus
The busbar voltage and reactive power of voltage and reactive power judgement wind-powered electricity generation-compensated transmission system compared with corresponding reference value
It is whether abnormal.
In one embodiment, in above-mentioned steps S13, the state of wind-powered electricity generation-compensated transmission system includes time for abnormality
The busbar voltage horizontal abnormality and reactive power horizontal abnormality of synchronous resonant abnormal signal, wind-powered electricity generation-compensated transmission system.Exception
Reason includes subsynchronous resonance signal is suppressed or eliminated, and the busbar voltage or idle to wind-powered electricity generation-compensated transmission system
Power is adjusted.
If signal measurement apparatus detects subsynchronous resonance signal, subsynchronous resonance signal is suppressed or eliminated,
Signal measurement apparatus calculates the capacity suppressed needed for subsynchronous resonance first, if subsynchronous resonance and reactive power Comprehensive Control system
The capacity of system is sufficient, then starts subsynchronous damper and send the electric current for suppressing subsynchronous resonance signal, so as to realize to subsynchronous
The suppression or elimination of resonance signal.
If the busbar voltage or reactive power horizontal abnormality of wind-powered electricity generation-compensated transmission system, to wind-powered electricity generation-compensated transmission system
Busbar voltage or reactive power be adjusted, signal measurement apparatus first checks for subsynchronous resonance and reactive power Comprehensive Control
Whether the capacity of system is sufficient.If subsynchronous resonance and the remaining capacity of reactive power complex control system are sufficient, signal
Measurement apparatus realizes the smooth adjustment to busbar voltage and reactive power by starting static reacance generator；If capacity is not
Foot, while static reacance generator starts, subsynchronous resonance and reactive power complex control system ask other wind-powered electricity generation-strings
Mend the part of the reactive power compensation device compensation capacity deficiency on transmission system bus.
According to above-mentioned steps, the signal measurement apparatus in the present embodiment can make full use of capacity, improve subsynchronous resonance
And the utilization rate of reactive power complex control system.Meanwhile detection information disposal ability, dynamic are strengthened by signal measurement apparatus
Adjust the distribution of subsynchronous resonance and reactive power complex control system capacity.
Fig. 7 is another embodiment of the present invention subsynchronous resonance and reactive power integrated control method.As shown in Figure 7, there is provided
The subsynchronous resonance and reactive power integrated control method of another embodiment, comprises the following steps：
S21：Obtain the initial detecting signal of subsynchronous resonance signal.
In above-mentioned steps S21, subsynchronous resonance and reactive power complex control system are by rationally designing subsynchronous damping
Device, it is set to produce the reference current signal directly proportional to wind-powered electricity generation-compensated transmission system voltage subsynchronous component, reference current letter
Number it is input in the high-power power electronic converter being connected in parallel at wind-powered electricity generation-compensated transmission system outlet bus and produces real time
Synchronizing current, the subsynchronous electric current is injected into wind-powered electricity generation-compensated transmission system, the SSR of wind-powered electricity generation-compensated transmission system is played
Damping action.
S22：Obtain the initial detecting signal of wind-powered electricity generation-compensated transmission system busbar voltage and reactive power.
The busbar voltage of wind-powered electricity generation-compensated transmission system is the voltage of wind-powered electricity generation-compensated transmission system exit bus；Idle work(
Rate is sent when being in capacitive mode of operation by SVG.
S23：According to above-mentioned steps S21 and S22, initial detecting signal is introduced into subsynchronous resonance suppressor and static reacance
Generator.
The subsynchronous resonance detection signal of acquisition, wind-powered electricity generation-compensated transmission system busbar voltage and reactive power information are led to
Cross one group of voltage, current transformer introduces the subsynchronous resonance suppressor and static reacance generator of wind-powered electricity generation-compensated transmission system
Busbar voltage and reactive power controller.
S24：When unusual condition occurs in the wind-powered electricity generation-compensated transmission system, preferentially judgement is the signal measurement apparatus
No generation subsynchronous resonance.
Whether signal measurement apparatus is abnormal after detecting serial compensation capacitance and voltage first compared with reference value, if wind-powered electricity generation-
Compensated transmission system is abnormal, then subsynchronous resonance phenomenon occurs for wind-powered electricity generation-compensated transmission system.
S25：When above-mentioned steps S24 occurs, capacity needed for subsynchronous damper is calculated.
If subsynchronous resonance occurs for wind-powered electricity generation-compensated transmission system, signal measurement apparatus calculates suppression subsynchronous resonance first
Required capacity, necessary condition is provided to start subsynchronous damper work.
S26：Start subsynchronous damper and send suppression electric current.
As shown in figure 5, subsynchronous damper main function is the feedback signal chosen according to signal measurement apparatus, pass through letter
Number treatment technology extracts the power system subsynchronous component of needs, and then produces time for suppressing wind-powered electricity generation-compensated transmission system SSR
Synchronizing current reference signal.
S27：Judge whether subsynchronous resonance phenomenon is inhibited or eliminates.
If subsynchronous resonance phenomenon does not suppress or eliminated, continue to monitor wind-powered electricity generation-compensated transmission system, reenter above-mentioned
In step S23；If subsynchronous resonance phenomenon suppresses or eliminated, signal measurement apparatus continues to examine according to event handling order
Survey the busbar voltage and reactive power signals of wind-powered electricity generation-compensated transmission system.
S28：Signal measurement apparatus judges whether wind-powered electricity generation-compensated transmission system busbar voltage and reactive power level conform to
Ask.
On the basis of above-mentioned steps S27, when subsynchronous phenomenon is inhibited or eliminated, signal measurement apparatus judges wind
Whether the busbar voltage or reactive power level of electricity-compensated transmission system meet the requirements.If wind-powered electricity generation-compensated transmission system bus electricity
Pressure and reactive power level meet the requirements, then signal measurement apparatus enters and continues to monitor, and is transferred to step S33.
S29：Check subsynchronous resonance and reactive power complex control system residual capacity.
When wind-powered electricity generation-compensated transmission system busbar voltage or reactive power it is horizontal it is undesirable need regulation when, signal is surveyed
Amount device checks that subsynchronous resonance and reactive power complex control system residual capacity, signal measurement apparatus judge that residual capacity is
It is no to be sufficiently used for starting static reacance generator.If subsynchronous resonance and reactive power complex control system residual capacity deficiency,
Then ask the reactive power compensator on other buses；If subsynchronous resonance and reactive power complex control system residual capacity are filled
Foot, then start static reacance generator.
S30：Start static reacance generator.
According to step S29, when subsynchronous resonance and reactive power complex control system residual capacity abundance, signal measurement
Device makes SVG start, and then SVG smoothly adjusts reactive power, then signal measurement apparatus, which enters, continues monitoring state, is transferred to step
Rapid S33.
S32：To the part of other wind-powered electricity generations-compensated transmission system bus request compensation capacity deficiency.
According to step S29, if subsynchronous resonance and reactive power complex control system residual capacity deficiency are signal measurements
Device sends information, asks the portion of the reactive power compensator compensation capacity deficiency on the bus of other wind-powered electricity generation-compensated transmission systems
Point, then go to step S23.Wherein, reactive power compensator refers to the equipment with no-power compensation function, such as synchronous capacitor, quiet
Only reactive-load compensator, static reacance generator etc., the present invention is not limited.
S31：By the regulation of signal measurement apparatus, make subsynchronous resonance and reactive power complex control system busbar voltage
And reactive power level meets the requirements, then signal measurement apparatus continues monitoring system, is transferred to step S33.
S33：Signal measurement apparatus continues to monitor wind-powered electricity generation-compensated transmission system, is transferred to step S23.
Summary step, present invention design on the basis of SVG add subsynchronous resonance suppressor particular location
Synchronous damper, circuit parameter and control strategy by redesigning signal measurement apparatus etc., thing is distinguished by logic control
Part priority, subsynchronous resonance and reactive power complex control system capacity are made full use of, the distribution of dynamic regulation capacity, makes its simultaneous
Have busbar voltage and Reactive Power Control and the function of subsynchronous resonance improvement, to ensure that wind-powered electricity generation collects wind-powered electricity generation-string benefit in area
Transmission system safe and stable operation provides reliable support.
In summary, the subsynchronous resonance of the embodiment of the present invention and reactive power integrated control method and device, for mesh
Preceding large-scale wind power collects the difficulty of areas comprehensive control, according to subsynchronous resonance signal, wind-powered electricity generation-compensated transmission system bus electricity
The initial detecting signal of pressure and reactive power, judge the state of wind-powered electricity generation-compensated transmission system, and then according to the preferential of event handling
Level order, subsynchronous resonance and the capacity of reactive power complex control system are made full use of, the distribution of dynamic regulation capacity, makes its simultaneous
Have busbar voltage and Reactive Power Control and a function that subsynchronous resonance is administered, realize and reasonably handle subsynchronous resonance and idle
Power, reliable support is provided to ensure that wind-powered electricity generation collects regional power network safety operation.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (9)
1. a kind of subsynchronous resonance and reactive power complex control system, it is characterised in that including：It is signal measurement apparatus, static
Reacance generator and subsynchronous resonance suppressor；
The signal measurement apparatus, for obtain comprising subsynchronous resonance signal, wind-powered electricity generation-compensated transmission system busbar voltage and
The initial detecting signal of reactive power, and judge based on the initial detecting signal state of wind-powered electricity generation-compensated transmission system, to enter
The sequential adjustment of the row busbar voltage, the reactive power and the subsynchronous resonance signal；
The static reacance generator, for receiving the regulation busbar voltage and the nothing that the signal measurement apparatus is sent
The signal of work(power, the first signal after regulation is sent to the bus of wind-powered electricity generation-compensated transmission system；
The subsynchronous resonance suppressor, the suppression subsynchronous resonance signal sent for receiving the signal measurement apparatus
Signal, the secondary signal after suppression is sent to the static reacance generator.
2. system according to claim 1, it is characterised in that the subsynchronous resonance suppressor includes：Wave filter, phase shift
Link, reference value calculator.
3. the method for subsynchronous resonance according to claim 1 and reactive power complex control system, it is characterised in that bag
Include：
The initial detecting comprising subsynchronous resonance signal, the busbar voltage of wind-powered electricity generation-compensated transmission system and reactive power is obtained to believe
Number；
The state of wind-powered electricity generation-compensated transmission system is judged according to the initial detecting signal；
If the state of the wind-powered electricity generation-compensated transmission system is abnormality, the wind-powered electricity generation-compensated transmission system is carried out abnormal
Processing.
4. according to the method for claim 3, it is characterised in that described that wind-powered electricity generation-string is judged according to the initial detecting signal
The state of transmission system is mended, including：
It is according to the priority orders of event handling that the subsynchronous resonance signal in the initial detecting signal, wind-powered electricity generation-string benefit is defeated
The busbar voltage and reactive power of electric system are compared with corresponding reference value, to judge the shape of wind-powered electricity generation-compensated transmission system
Whether state is abnormal.
5. according to the method for claim 4, it is characterised in that the event handling includes：Subsynchronous phenomenon suppresses/disappeared
Remove, and the regulation of the busbar voltage and reactive power of wind-powered electricity generation-compensated transmission system；The priority orders are subsynchronous phenomenon
The priority of suppression/elimination is more than the busbar voltage of wind-powered electricity generation-compensated transmission system and the priority of reactive power regulation；
According to the priority orders of the event handling by the subsynchronous resonance signal in the initial detecting signal, wind-powered electricity generation-string
Mend transmission system busbar voltage and reactive power compared with corresponding reference value, including：
By the subsynchronous resonance signal compared with corresponding reference value, judge whether subsynchronous resonance phenomenon is abnormal, when
Synchronous resonant phenomenon is normal or the subsynchronous signal is suppressed or eliminated and then by wind-powered electricity generation-compensated transmission system
Busbar voltage and reactive power judgement wind-powered electricity generation-compensated transmission system compared with corresponding reference value busbar voltage and nothing
Whether work(power is abnormal.
6. according to the method for claim 5, it is characterised in that described that exception is carried out to the wind-powered electricity generation-compensated transmission system
Processing, including：The subsynchronous resonance signal is suppressed or eliminated, and the bus electricity to wind-powered electricity generation-compensated transmission system
Pressure or reactive power are adjusted.
7. according to the method for claim 6, it is characterised in that described that the subsynchronous resonance signal is suppressed or disappeared
Except including：
Calculate the capacity needed for the suppression subsynchronous resonance signal；
Startup subsynchronous resonance suppressor sends suppression electric current and the subsynchronous resonance signal is suppressed or eliminated.
8. according to the method for claim 6, it is characterised in that the busbar voltage to wind-powered electricity generation-compensated transmission system or
Reactive power is adjusted, including：
Check whether the capacity of subsynchronous resonance and reactive power complex control system is sufficient；
If it is, control static reacance generator is actuated for the smooth adjustment of busbar voltage and reactive power.
9. according to the method for claim 8, it is characterised in that if subsynchronous resonance and reactive power complex control system
Off-capacity, in addition to：
While the static reacance generator starts, compensation capacity deficiency is asked to other wind-powered electricity generations-compensated transmission system
Part.
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