CN108233397A - A kind of control method and system of photovoltaic generation power oscillation damping - Google Patents
A kind of control method and system of photovoltaic generation power oscillation damping Download PDFInfo
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- CN108233397A CN108233397A CN201711384887.9A CN201711384887A CN108233397A CN 108233397 A CN108233397 A CN 108233397A CN 201711384887 A CN201711384887 A CN 201711384887A CN 108233397 A CN108233397 A CN 108233397A
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention relates to a kind of control methods and system of photovoltaic generation power oscillation damping, and the active power amplitude of collected photovoltaic electric station grid connection point is input in the Controlling model of low-frequency oscillation restraining device pre-established, calculate control output signal value；The reference value of the control output signal value and the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system is overlapped, participates in the control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system；The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag links, proportional component and amplitude limit link.Photovoltaic generation additional longitudinal forces method of the technical solution provided by the invention effectively to inhibit low-frequency oscillation of electric power system, using the Reactive-power control allowance and Reactive-power control ability of photovoltaic generating system come power oscillation damping, utilization of the existing method to active power is avoided, avoids influencing the generating capacity of photovoltaic system.
Description
Technical field
The present invention relates to the control methods and system of a kind of photo-voltaic power generation station, and in particular to a kind of photovoltaic generation inhibits low frequency
The control method and system of oscillation.
Background technology
In recent years, photovoltaic generation is worldwide rapidly developed, and a large amount of centralization large-sized photovoltaic power stations are in succession simultaneously
Net or in planning construction, such as Canadian Ontario photovoltaic plants (100MW), Yuma County, the AZ power stations in the U.S.
Golmud power station (300MW) of (250MW), China etc., these power stations are often in the end of system, normal open long-distance circuit
It send to load center.Low frequency oscillations Producing reason is typically due to the Negative damping effect Damping of system, often appear in it is weak contact,
At a distance, on heavy load transmission line of electricity, some researches show that there are one to electricity grid oscillating for the access of photovoltaic generation high permeability
Fixing is rung.
As the problem of photovoltaic generation accesses power grid on a large scale, and photovoltaic generation influences low frequency oscillations, also begins to cause
Concern.Existing research at present lays particular emphasis on influence of the analysis photovoltaic generation to low-frequency oscillation of electric power system mode, a small amount of related light
The research of volt power generation power oscillation damping lays particular emphasis on the method based on active modulation, i.e., is pressed down using active power as photovoltaic generation
The input signal of low-frequency oscillation controller processed, it (is photovoltaic maximum power in certain document first to reduce active power operating point
Half), to ensure that photovoltaic system has enough active adjusting allowances to participate in inhibiting low-frequency oscillation of electric power system.What this drop was contributed
The method of operation reduces the active of photovoltaic output to a certain extent, also changes the steady-state operation during low frequency oscillations
Point, it is possible to cause new oscillation when photovoltaic plant switches back into maximal power tracing operational mode, influence the hair of photovoltaic system
Electric energy power, it is therefore necessary to be improved.
Invention content
To solve above-mentioned deficiency of the prior art, the object of the present invention is to provide a kind of photovoltaic generation power oscillation dampings
Control method and system, effectively inhibit low-frequency oscillation of electric power system photovoltaic generation additional longitudinal forces method, utilize photovoltaic
The Reactive-power control allowance and Reactive-power control ability of electricity generation system carry out power oscillation damping, avoid profit of the existing method to active power
With, avoid influence photovoltaic system generating capacity.
The purpose of the present invention is what is realized using following technical proposals：
The present invention provides a kind of control method of photovoltaic generation power oscillation damping, thes improvement is that：
The active power amplitude of collected photovoltaic electric station grid connection point is input to the low-frequency oscillation pre-established and inhibits dress
In the Controlling model put, control output signal value is calculated；
The reference value of the control output signal value and the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system is overlapped,
Participate in the control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag rings
Section, proportional component and amplitude limit link.
Further：The active power amplitude by collected photovoltaic electric station grid connection point be input to pre-establish it is low
In the Controlling model of frequency vibration suppression device, control output signal value is calculated, including：
Perunit value is calculated according to the active power amplitude and preset active power reference value；
The perunit value is input in blocking link and obtains high pass filtered signals；
The high pass filtered signals are input to after first lead-lag link and obtain a phase shift output signal；
The phase shift output signal signal is input to after second lead-lag link and obtains secondary phase shift output
Signal；
The secondary phase shift output signal is input to after proportional component and obtains ratio enlargement signal；
The ratio enlargement signal is input to after amplitude limit link and obtains control output signal value.
Further：The perunit value calculates according to the following formula：
ΔPu=Δ P/Pref
In formula：PrefFor the active power reference value of photovoltaic electric station grid connection point, Δ P is active power departure Δ P, Δ P=
Pref- P, P survey amplitude for active power.
Further：The described perunit value is input in blocking link obtains high pass filtered signals, including：
By perunit value Δ PuInput blocking linkObtain high pass filtered signals Δ Pw,Its
In：TwFor blocking time constant.
Further：It is described the high pass filtered signals are input to first lead-lag link after once moved
Phase output signal, including：
By high pass filtered signals Δ PwInput first lead-lag linkObtain a phase shift output signal Δ
PT1,Wherein T1 and T2 is time constant.
Further：Described be input to the phase shift output signal signal must after second lead-lag link
Include to secondary phase shift output signal：
By a phase shift output signal Δ PT1Input second lead-lag linkObtain secondary phase shift output
Signal delta PT2,Wherein T3 and T4 is time constant.
Further：Two are obtained after the phase shift output signal signal is input to second lead-lag link
Secondary phase shift output signal, including：
By secondary phase shift output signal Δ PT2Proportional component K is inputted, obtains ratio enlargement signal delta PK, Δ PK=K Δs PT2。
Further：The described ratio enlargement signal is input to after amplitude limit link obtains control output signal value packet
It includes：
By ratio enlargement signal delta PKInput saturation link obtains control output signal value Δ Pout；If control output signal
It is worth Δ Pout>Limit_max then controls output signal value Δ P 'out=Limit_max；If control output signal value Δ Pout<
Limit_min then controls output signal value Δ P 'out=Limit_min.
Further：Described by the control output signal value and the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system
Reference value is overlapped, and after the control of REACTIVE POWER/VOLTAGE CONTROL ring for participating in photovoltaic generating system, is further included：It establishes electromechanical temporary
The grid-connected simulation analysis model of state verifies the validity of the control method.
Further：It is described to establish the grid-connected simulation analysis model of electromechanical transient, it verifies the validity of the control method, wraps
It includes：
Establish the grid-connected simulation analysis model of electromechanical transient of photovoltaic plant access electric system；
The grid-connected simulation analysis model of the electromechanical transient of the foundation is carried out respectively using photovoltaic generation power oscillation damping
Control method and do not use photovoltaic generation power oscillation damping control method model analysis, examine the control method
Validity；
The grid-connected simulation analysis model of the electromechanical transient of the foundation is carried out respectively using photovoltaic generation power oscillation damping
Control method and do not use photovoltaic generation power oscillation damping control method time-domain-simulation analysis, examine the controlling party
The validity of method.
Further：The grid-connected simulation analysis model of the electromechanical transient of the foundation is carried out respectively using photovoltaic generation to inhibit
The control method of low-frequency oscillation and do not use photovoltaic generation power oscillation damping control method model analysis, examine the control
The validity of method processed includes：
Using photovoltaic generation power oscillation damping control method when, the feature in the grid-connected simulation analysis model of electromechanical transient
Root is moved to the Left half-plane of complex plane, and damping ratio increases, then the control method is effective；Otherwise it is invalid.
Further：The grid-connected simulation analysis model of the electromechanical transient of the foundation is carried out respectively using photovoltaic generation to inhibit
The control method of low-frequency oscillation and do not use photovoltaic generation power oscillation damping control method time-domain-simulation analysis, inspection institute
The validity for stating control method includes：After the control method of photovoltaic generation power oscillation damping, electromechanical transient is grid-connected imitative
The oscillatory occurences of true analysis model is inhibited, then the control method is effective；Otherwise it is invalid.
The present invention also provides a kind of control systems of photovoltaic generation power oscillation damping, the improvement is that：Including：
Control output computing module, shakes for the photovoltaic electric station grid connection of setting point parameter to be input to the low frequency pre-established
It swings in the Controlling model of restraining device, calculates control output signal value；
REACTIVE POWER/VOLTAGE CONTROL ring computing module, for the control output signal value to be superimposed upon photovoltaic generating system
In REACTIVE POWER/VOLTAGE CONTROL ring reference value, REACTIVE POWER/VOLTAGE CONTROL ring is carried out as new reference value, and to the new reference value
Operation；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag rings
Section, proportional component and amplitude limit link.
The amplitude limit link computing module, including：
Setup unit, for calculating perunit according to the active power amplitude and preset active power reference value
Value；
Input unit obtains high pass filtered signals for the perunit value to be input in blocking link；
First obtains unit, for obtaining one after the high pass filtered signals are input to first lead-lag link
Secondary phase shift output signal；
Second obtaining unit, for the phase shift output signal signal to be input to second lead-lag link
After obtain secondary phase shift output signal；
Third obtaining unit obtains ratio enlargement letter for the secondary phase shift output signal to be input to after proportional component
Number；
4th obtaining unit obtains control output signal for the ratio enlargement signal to be input to after amplitude limit link
Value.
The system also includes：Module is established, for establishing the grid-connected simulation analysis model of electromechanical transient, verifies the control
The validity of method.
Further：It is described to establish module, including：
Construction unit, for establishing the grid-connected simulation analysis model of electromechanical transient of photovoltaic plant access electric system；
First authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic
Generate electricity power oscillation damping control method and do not use photovoltaic generation power oscillation damping control method model analysis, examine
Test the validity of the control method；
Second authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic
Generate electricity power oscillation damping control method and do not use photovoltaic generation power oscillation damping control method time-domain-simulation divide
The validity of the control method is examined in analysis.
Further：First authentication unit is additionally operable to：
Using photovoltaic generation power oscillation damping control method when, the feature in the grid-connected simulation analysis model of electromechanical transient
Root is moved to the Left half-plane of complex plane, and damping ratio increases, then the control method is effective；Otherwise it is invalid.
Further：First authentication unit is additionally operable to：
After the control method of photovoltaic generation power oscillation damping, the oscillation of the grid-connected simulation analysis model of electromechanical transient
Phenomenon is inhibited, then the control method is effective；Otherwise it is invalid.
Compared with the immediate prior art, technical solution provided by the invention has an advantageous effect in that：
1) the active power amplitude of collected photovoltaic electric station grid connection point is input to the low frequency pre-established and shaken by the present invention
It swings in the Controlling model of restraining device, calculates control output signal value；By the control output signal value and photovoltaic generating system
The reference value of REACTIVE POWER/VOLTAGE CONTROL ring be overlapped, participate in the control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system；Institute
It states the Controlling model of low-frequency oscillation restraining device pre-established and includes blocking link, two lead-lag links, proportional components
And amplitude limit link, effectively inhibit the photovoltaic generation additional longitudinal forces method of low-frequency oscillation of electric power system, utilize photovoltaic generation system
The Reactive-power control allowance and Reactive-power control ability of system carry out power oscillation damping, avoid utilization of the existing method to active power, keep away
Exempt from the generating capacity of influence photovoltaic system.
2) damping frequencies oscillation controller is superimposed by the REACTIVE POWER/VOLTAGE CONTROL ring in photovoltaic generating system, with routine
Thermoelectricity, Hydropower Unit power oscillation damping mechanism are similar, clear physics conception, easy to be easy-to-use, convenient for the electricity of different knowledge hierarchies
Lixing industrial engineering (IE) teacher and researcher are grasped and are used.Avoid shadow of the existing method using active power to generating capacity
It rings, while technical performance is ensured, effectively increases photovoltaic plant economic benefit.
3) has versatility, the low-frequency oscillation inhibition of easy expanded application to wind generator system and other similar systems is asked
Topic, has a extensive future.
Description of the drawings
Fig. 1 is a photovoltaic plant access system example structure diagram in specific embodiment provided by the invention；
Fig. 2 is the Controlling model figure of low-frequency oscillation restraining device in the embodiment of the present invention；
Fig. 3 is time domain when not throwing/put into low-frequency oscillation controller in the embodiment of the present invention under system generation Short-circuit Working Condition
Simulation result comparison diagram；
Fig. 4 is the flow chart of the control method of photovoltaic generation power oscillation damping provided by the invention；
Fig. 5 is Δ P provided by the inventionoutIt is superimposed upon showing for the reference value of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system
It is intended to.
Specific embodiment
The specific embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Put into practice them.Other embodiments can include structure, logic, it is electrical, process and other change.Embodiment
Only represent possible variation.Unless explicitly requested, otherwise individual component and function are optional, and the sequence operated can be with
Variation.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The range of bright embodiment includes equivalent obtained by the entire scope of claims and all of claims
Object.Herein, these embodiments of the invention can individually or generally be represented that this is only with term " invention "
For convenience, it and if in fact disclosing the invention more than one, is not meant to automatically limit ranging from appointing for the application
What single invention or inventive concept.
Embodiment one,
The present invention provides a kind of control method of the photovoltaic generation power oscillation damping based on idle modulation, and flow chart is as schemed
Shown in 4, including：
S11, the active power amplitude of collected photovoltaic electric station grid connection point is input to the low-frequency oscillation suppression pre-established
In the Controlling model of device processed, control output signal value is calculated；
S12, the reference value of the control output signal value and the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system is folded
Add, participate in the control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag rings
Section, proportional component and amplitude limit link.
The photovoltaic electric station grid connection point parameter of the setting, including：
Measure the wattful power of the active power amplitude of obtained photovoltaic electric station grid connection point and the photovoltaic electric station grid connection point of setting
Rate reference value.
The photovoltaic electric station grid connection of setting point parameter is input to the low-frequency oscillation restraining device that pre-establishes in step S11
In Controlling model, control output signal value is calculated, including：
Perunit value is calculated according to active power amplitude and active power reference value；
The perunit value is input in blocking link and obtains high pass filtered signals；
The high pass filtered signals are input to after first lead-lag link and obtain a phase shift output signal；
The phase shift output signal signal is input to after second lead-lag link and obtains secondary phase shift output
Signal；
The secondary phase shift output signal is input to after proportional component and obtains ratio enlargement signal；
The ratio enlargement signal is input to after amplitude limit link and obtains control output signal value.
Wherein：Step S11 after assignment includes：
Step 1：Measure the active power amplitude P of photovoltaic electric station grid connection point；
Step 2：By active power reference value (initial value) P of photovoltaic electric station grid connection pointrefSubtract the active power for measuring and obtaining
Value P, obtains departure Δ P, and by departure Δ P divided by active power reference value Pref, obtain perunit value Δ Pu；
Step 3：By Δ PuInput blocking linkObtain signal delta Pw, wherein：TwFor blocking time constant；
Step 4：By Δ PwInput first lead-lag linkObtain signal delta PT1, when wherein T1 and T2 are
Between constant；
Step 5：By Δ PT1Input second lead-lag linkObtain signal delta PT2, when wherein T3 and T4 are
Between constant；
Step 6：By Δ PT2Proportional component K is inputted, obtains signal delta PK；
Step 7：By ratio enlargement signal delta PKInput saturation link (upper limit Limit_max, lower limit Limit_
Min), control output signal value Δ P is obtainedout；If control output signal value Δ Pout>Limit_max then controls output signal value
ΔP’out=Limit_max；If control output signal value Δ Pout<Limit_min then controls output signal value Δ P 'out=
Limit_min。
Step 8：By Δ PoutIt is superimposed upon in the reference value of REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system, as shown in figure 5,
Wherein, Vmea is the measured value of photovoltaic generating system set end voltage, and Vref is the reference value of photovoltaic generating system set end voltage, Tr
It is time of measuring constant, TC is control time constant, and Kpv, Kiv are proportionality coefficient and integral coefficient respectively, and Qmax1, Qmin1 divide
It is not the upper and lower bound of integral element output, Qmax2, Qmin2 are the upper and lower bound of control output respectively, and Qcmd is nothing
The output of work(/ voltage control loop.ΔP’outThe model calculation of photovoltaic generating system is participated in, electric system low frequency is inhibited to shake to play
The effect swung.
Step 9：Establish the simulation analysis example model of photovoltaic plant access electric system.
Step 10：For step 9 establish model carry out respectively photovoltaic generation power oscillation damping controller input before and
Model analysis after input obtains the characteristic root real part of system and damping ratio numerical value.If after controller input, characteristic root to putting down again
The Left half-plane movement in face (s planes), and damping ratio increases, and the useful effect of controller is just illustrated from frequency-domain analysis；It is no
Then illustrate that controller is invalid.
Step 11：For step 9 establish model carry out respectively photovoltaic generation power oscillation damping controller input before and
Time-domain-simulation analysis after input, i.e. setting disturb, and observe the effect of controller.If after controller input, oscillatory occurences obtains
Inhibit (number of oscillation is few, and oscillation is comparatively fast calmed down or decayed), the effective of controller is just illustrated from time-domain analysis
Effect；Otherwise illustrate that controller is invalid.
In the step 1, for photovoltaic electric station grid connection point, if photovoltaic plant there are booster stations, refer to booster stations high-voltage side bus
Or node, if photovoltaic plant refers to the output aggregation point of photovoltaic plant without booster stations.For the measurement data of acquisition, need to it
Low-pass filtering treatment is carried out, the cutoff frequency of wave filter is generally 10Hz or so.
The active power reference value of photovoltaic electric station grid connection point in the step 2 is generally the initial value under its steady state condition,
It can be provided by calculation of tidal current.
In the step 3, TwValue range be usually 4~8.
In the step 4, the phase calculation that the specific value of T1 and T2 compensate as needed determines.
In the step 5, the phase calculation that the specific value of T3 and T4 compensate as needed determines.
In the step 6, K is typically greater than 1 positive value, but is also smaller than 1.
In the step 7, Limit_max is generally 5%, Limit_min and is generally -5%.
In the step 8, typical electromechanical transient simulation model both at home and abroad, packet may be used in the model of photovoltaic generating system
Include the model issued or proposed in the electric power coordination committee of US West WECC, General Electric GE, chinese national standard.They are
Contain REACTIVE POWER/VOLTAGE CONTROL ring.
It, can be in common electric system simulation analysis software, such as DIgSILENT in the step 9
The simulation analysis example mould of photovoltaic plant access electric system is established in PowerFactory, PSS/E, PSASP, BPA, MATLAB
Type, example system may be used typical two regions, four machine system or rely on Practical Project system.
Setting disturbance is not required in the step 10, only needs to put into or do not put into controller respectively to carry out mode point
Analysis, common electric system simulation analysis software is provided with model analysis function, such as DIgSILENT PowerFactory, PSS/
E、PSASP、BPA。
In the step 11, disturbance setting is general it is contemplated that the shapes such as short circuit, one circuit of excision, voltage reference value step
Formula.
Embodiment two
Fig. 1 is a photovoltaic plant access system example structure diagram, which is at home and abroad common use
In the access that photovoltaic plant is increased in two regions, the four machine system-based of research low-frequency oscillation problem.Fig. 2 is low-frequency oscillation suppression
The Controlling model figure of device processed, the Controlling model include a blocking link, two lead-lag links, a ratio enlargement
Link and an amplitude limit link, the inhibition available for different low-frequency oscillations.Table 1 is not throw/put into low-frequency oscillation controller
When modal analysis result contrast table, Fig. 4 is time domain when system occurs not throw/put into low-frequency oscillation controller under Short-circuit Working Condition
Simulation result comparison diagram.The input photovoltaic generating system based on idle modulation of the invention designed is can be seen that from table 1 and Fig. 4
After low-frequency oscillation controller, system damping is increased, and oscillation is inhibited, and system stability is improved.Verification
The validity and practicability of low-frequency oscillation suppression method proposed by the present invention, table 1 are as follows：
Modal analysis result contrast table during low-frequency oscillation controller is not thrown/put into table 1
Embodiment three,
Based on same inventive concept, the present invention also provides a kind of control system of photovoltaic generation power oscillation damping, packets
It includes：
Amplitude limit link computing module shakes for the photovoltaic electric station grid connection of setting point parameter to be input to the low frequency pre-established
It swings in the Controlling model of restraining device, calculates amplitude limit link signal value；
REACTIVE POWER/VOLTAGE CONTROL ring computing module, for the amplitude limit link signal value to be superimposed upon photovoltaic generating system
In REACTIVE POWER/VOLTAGE CONTROL ring reference value, as new reference value, and to the new reference value into being advanced into REACTIVE POWER/VOLTAGE control
Ring operation processed；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag rings
Section, proportional component and amplitude limit link.
The amplitude limit link computing module, including：
Setup unit, for calculating perunit according to the active power amplitude and preset active power reference value
Value；
Input unit obtains high pass filtered signals for the perunit value to be input in blocking link；
First obtains unit, for obtaining one after the high pass filtered signals are input to first lead-lag link
Secondary phase shift output signal；
Second obtaining unit, for the phase shift output signal signal to be input to second lead-lag link
After obtain secondary phase shift output signal；
Third obtaining unit obtains ratio enlargement letter for the secondary phase shift output signal to be input to after proportional component
Number；
4th obtaining unit obtains control output signal for the ratio enlargement signal to be input to after amplitude limit link
Value.
The system also includes：Module is established, for establishing the grid-connected simulation analysis model of electromechanical transient, verifies the control
The validity of method.
Further：It is described to establish module, including：
Construction unit, for establishing the grid-connected simulation analysis model of electromechanical transient of photovoltaic plant access electric system；
First authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic
Generate electricity power oscillation damping control method and do not use photovoltaic generation power oscillation damping control method model analysis, examine
Test the validity of the control method；
Second authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic
Generate electricity power oscillation damping control method and do not use photovoltaic generation power oscillation damping control method time-domain-simulation divide
The validity of the control method is examined in analysis.
Further：First authentication unit is additionally operable to：
Using photovoltaic generation power oscillation damping control method when, the feature in the grid-connected simulation analysis model of electromechanical transient
Root is moved to the Left half-plane of complex plane, and damping ratio increases, then the control method is effective；Otherwise it is invalid.
Further：First authentication unit is additionally operable to：
After the control method of photovoltaic generation power oscillation damping, the oscillation of the grid-connected simulation analysis model of electromechanical transient
Phenomenon is inhibited, then the control method is effective；Otherwise it is invalid.
The specific embodiment of the invention can equally be well applied to the access electric power such as wind power plant by taking photovoltaic plant access system as an example
The low-frequency oscillation of system inhibits problem.Inhibition electric power proposed by the present invention using photovoltaic generating system own reactive fan-out capability
Low frequency oscillations method avoids existing method using influence of the active power to generating capacity, is ensureing technical performance
Meanwhile effectively increase photovoltaic plant economic benefit.It is low by the REACTIVE POWER/VOLTAGE CONTROL ring superposition damping in photovoltaic generating system
Frequency oscillating controller, clear physics conception similar with conventional thermoelectricity, Hydropower Unit power oscillation damping mechanism is easy to be easy-to-use,
It grasps and uses convenient for the power industry engineer of different knowledge hierarchies and researcher.The method of the invention has general
Property, the low-frequency oscillation of easy expanded application to wind generator system and other similar systems inhibits problem, has a extensive future.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the application
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the application
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be 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 generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although with reference to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to the present invention specific embodiment into
Row modification either equivalent replacement these without departing from any modification of spirit and scope of the invention or equivalent replacement, applying
Within the claims of the pending present invention.
Claims (18)
1. a kind of control method of photovoltaic generation power oscillation damping, it is characterised in that：
The active power amplitude of collected photovoltaic electric station grid connection point is input to the low-frequency oscillation restraining device that pre-establishes
In Controlling model, control output signal value is calculated；
The reference value of the control output signal value and the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system is overlapped, is participated in
The control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag links, ratio
Example link and amplitude limit link.
2. control method as described in claim 1, it is characterised in that：It is described by the active of collected photovoltaic electric station grid connection point
Power magnitude is input in the Controlling model of low-frequency oscillation restraining device pre-established, calculates control output signal value, including：
Perunit value is calculated according to the active power amplitude and preset active power reference value；
The perunit value is input in blocking link and obtains high pass filtered signals；
The high pass filtered signals are input to after first lead-lag link and obtain a phase shift output signal；
The phase shift output signal signal is input to after second lead-lag link and obtains secondary phase shift output letter
Number；
The secondary phase shift output signal is input to after proportional component and obtains ratio enlargement signal；
The ratio enlargement signal is input to after amplitude limit link and obtains control output signal value.
3. control method as claimed in claim 2, it is characterised in that：The perunit value calculates according to the following formula：
ΔPu=Δ P/Pref
In formula：PrefFor the active power reference value of photovoltaic electric station grid connection point, Δ P is active power departure Δ P, Δ P=Pref-
P, P survey amplitude for active power.
4. control method as claimed in claim 3, it is characterised in that：The described perunit value is input in blocking link obtains
To high pass filtered signals, including：
By perunit value Δ PuInput blocking linkObtain high pass filtered signals Δ Pw,Wherein：Tw
For blocking time constant.
5. control method as claimed in claim 4, it is characterised in that：It is described that the high pass filtered signals are input to first
A phase shift output signal is obtained after lead-lag link, including：
By high pass filtered signals Δ PwInput first lead-lag linkObtain a phase shift output signal Δ PT1,Wherein T1 and T2 is time constant.
6. control method as claimed in claim 5, it is characterised in that：It is described to input the phase shift output signal signal
Secondary phase shift output signal is obtained after to second lead-lag link to include：
By a phase shift output signal Δ PT1Input second lead-lag linkObtain secondary phase shift output signal
ΔPT2,Wherein T3 and T4 is time constant.
7. control method as claimed in claim 6, it is characterised in that：The phase shift output signal signal is input to
Secondary phase shift output signal is obtained after two lead-lag links, including：
By secondary phase shift output signal Δ PT2Proportional component K is inputted, obtains ratio enlargement signal delta PK, Δ PK=K Δs PT2。
8. control method as claimed in claim 7, it is characterised in that：It is described that the ratio enlargement signal is input to amplitude limit ring
Control output signal value is obtained after section to include：
By ratio enlargement signal delta PKInput saturation link obtains control output signal value Δ Pout；If control output signal value Δ
Pout>Limit_max then controls output signal value Δ P 'out=Limit_max；If control output signal value Δ Pout<Limit_
Min then controls output signal value Δ P 'out=Limit_min.
9. control method as described in claim 1, it is characterised in that：The control output signal value is sent out with photovoltaic described
The reference value of the REACTIVE POWER/VOLTAGE CONTROL ring of electric system is overlapped, and participates in the control of the REACTIVE POWER/VOLTAGE CONTROL ring of photovoltaic generating system
After system, further include：The grid-connected simulation analysis model of electromechanical transient is established, verifies the validity of the control method.
10. control method as claimed in claim 9, it is characterised in that：It is described to establish the grid-connected simulation analysis model of electromechanical transient,
Verify the validity of the control method, including：
Establish the grid-connected simulation analysis model of electromechanical transient of photovoltaic plant access electric system；
Carry out the control using photovoltaic generation power oscillation damping respectively to the grid-connected simulation analysis model of the electromechanical transient of the foundation
Method processed and do not use photovoltaic generation power oscillation damping control method model analysis, examine the effective of the control method
Property；
Carry out the control using photovoltaic generation power oscillation damping respectively to the grid-connected simulation analysis model of the electromechanical transient of the foundation
Method processed and do not use photovoltaic generation power oscillation damping control method time-domain-simulation analysis, examine the control method
Validity.
11. control method as claimed in claim 10, it is characterised in that：To the grid-connected simulation analysis of the electromechanical transient of the foundation
Model carries out using the control method of photovoltaic generation power oscillation damping respectively and does not use photovoltaic generation power oscillation damping
The model analysis of control method examines the validity of the control method to include：
Using photovoltaic generation power oscillation damping control method when, characteristic root in the grid-connected simulation analysis model of electromechanical transient to
The Left half-plane movement of complex plane, and damping ratio increases, then the control method is effective；Otherwise it is invalid.
12. control method as claimed in claim 10, it is characterised in that：To the grid-connected simulation analysis of the electromechanical transient of the foundation
Model carries out using the control method of photovoltaic generation power oscillation damping respectively and does not use photovoltaic generation power oscillation damping
The time-domain-simulation analysis of control method, examines the validity of the control method to include：Low frequency is inhibited to shake according to photovoltaic generation
After the control method swung, the oscillatory occurences of the grid-connected simulation analysis model of electromechanical transient is inhibited, then the control method is effective；
Otherwise it is invalid.
13. a kind of control system of photovoltaic generation power oscillation damping, it is characterised in that：Including：
Control output computing module, for the photovoltaic electric station grid connection of setting point parameter to be input to the low-frequency oscillation pre-established suppression
In the Controlling model of device processed, control output signal value is calculated；
REACTIVE POWER/VOLTAGE CONTROL ring computing module, for by it is described control output signal value be superimposed upon photovoltaic generating system it is idle/
In voltage control loop reference value, REACTIVE POWER/VOLTAGE CONTROL ring operation is carried out as new reference value, and to the new reference value；
The Controlling model of low-frequency oscillation restraining device pre-established includes blocking link, two lead-lag links, ratio
Example link and amplitude limit link.
14. control system as claimed in claim 13, it is characterised in that：The amplitude limit link computing module, including：
Setup unit, for calculating perunit value according to the active power amplitude and preset active power reference value；
Input unit obtains high pass filtered signals for the perunit value to be input in blocking link；
First obtains unit, for once being moved after the high pass filtered signals are input to first lead-lag link
Phase output signal；
Second obtaining unit, must after second lead-lag link for the phase shift output signal signal to be input to
To secondary phase shift output signal；
Third obtaining unit obtains ratio enlargement signal for the secondary phase shift output signal to be input to after proportional component；
4th obtaining unit obtains control output signal value for the ratio enlargement signal to be input to after amplitude limit link.
15. control system as claimed in claim 13, it is characterised in that：The system also includes：Module is established, for establishing
The grid-connected simulation analysis model of electromechanical transient verifies the validity of the control method.
16. control system as claimed in claim 15, it is characterised in that：It is described to establish module, including：
Construction unit, for establishing the grid-connected simulation analysis model of electromechanical transient of photovoltaic plant access electric system；
First authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic generation
The control method of power oscillation damping and do not use photovoltaic generation power oscillation damping control method model analysis, inspection institute
State the validity of control method；
Second authentication unit is carried out respectively for the grid-connected simulation analysis model of electromechanical transient to the foundation using photovoltaic generation
The control method of power oscillation damping and do not use photovoltaic generation power oscillation damping control method time-domain-simulation analysis, inspection
Test the validity of the control method.
17. control system as claimed in claim 16, it is characterised in that：First authentication unit is additionally operable to：
Using photovoltaic generation power oscillation damping control method when, characteristic root in the grid-connected simulation analysis model of electromechanical transient to
The Left half-plane movement of complex plane, and damping ratio increases, then the control method is effective；Otherwise it is invalid.
18. control system as claimed in claim 16, it is characterised in that：First authentication unit is additionally operable to：
After the control method of photovoltaic generation power oscillation damping, the oscillatory occurences of the grid-connected simulation analysis model of electromechanical transient
It is inhibited, then the control method is effective；Otherwise it is invalid.
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