CN106300386B - Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG - Google Patents
Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG Download PDFInfo
- Publication number
- CN106300386B CN106300386B CN201510317896.0A CN201510317896A CN106300386B CN 106300386 B CN106300386 B CN 106300386B CN 201510317896 A CN201510317896 A CN 201510317896A CN 106300386 B CN106300386 B CN 106300386B
- Authority
- CN
- China
- Prior art keywords
- power grid
- control amount
- deviation
- voltage
- reactive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000010355 oscillation Effects 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 31
- 230000003068 static effect Effects 0.000 claims description 17
- 230000005764 inhibitory process Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 abstract description 8
- 238000011217 control strategy Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 125000002619 bicyclic group Chemical group 0.000 description 7
- 238000013016 damping Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- 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]
Landscapes
- Control Of Eletrric Generators (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of a power grid based on SVG (scalable vector graphics), which comprises the following steps: collecting three-phase voltage of a power grid; tracking the three-phase voltage of the power grid to obtain the frequency of the power grid; filtering the power grid frequency to obtain a frequency actual value for inhibiting subsynchronous oscillation of the power grid; the actual frequency value for inhibiting the sub-synchronous oscillation of the power grid is differed from the reference frequency value for inhibiting the sub-synchronous oscillation of the power grid to form a power grid frequency deviation value, and the power grid frequency deviation value is subjected to proportional-integral control to obtain a control quantity corresponding to the power grid frequency deviation value; and performing closed-loop control on the control quantity corresponding to the power grid frequency deviation value to obtain compensation voltage for inhibiting subsynchronous oscillation of the power grid, so that the subsynchronous oscillation of the power grid is inhibited. The control method can dynamically and effectively inhibit the subsynchronous oscillation of the power grid.
Description
Technical field
The present invention relates to power network reactive power compensation technical fields, and in particular to one kind is based on SVG (Static Var
Generator, static reactive generator) dynamic inhibit power grid sub-synchronous oscillation Frequency servo method.
Background technique
China has a vast territory, and the energy and expanding economy are geographically in contrary distribution, extremely uneven, thus carries out great Rong
Amount, transmit electricity at a distance it is imperative.But there is power limited in high pressure, remote conveying power technology.
In the prior art, general that high pressure, the presence of remote conveying power technology are solved using fixed series compensation technology of transmission of electricity
Power limited problem solve China's electric power and send out limitation problem to realize electric power netting safe running and economic electric transmission.But
Fixed series compensation technology of transmission of electricity is also brought to some wind power plants subsynchronous while improving transmission line of electricity conveying capacity
The problem of vibrating (SSO, SubsynchronousOscillation), and sub-synchronous oscillation will seriously affect wind-power electricity generation system
The stable operation of system.
For the sub-synchronous oscillation for solving the problems, such as power grid, following several sides for inhibiting power grid sub-synchronous oscillations are mainly used at present
Method: supplementary excitation damping control inhibits method, block filter that method, subsynchronous additional longitudinal forces is inhibited to inhibit method and static
Reactive-load compensator inhibits method.But above-mentioned suppressing method does not use full-control type power device, thus to time in transmission system
The inhibitory effect of synchronized oscillation is very limited.
Summary of the invention
The technical problem to be solved by the present invention is to provide one kind and be based on for the drawbacks described above in the presence of the prior art
SVG and dynamic, effectively inhibit power grid sub-synchronous oscillation Frequency servo method.
Solving technical solution used by present invention problem is:
The present invention provides a kind of Frequency servo method for inhibiting power grid sub-synchronous oscillation based on SVG dynamic, the control
Method processed includes the following steps:
Step 1) acquires power grid three-phase voltage；
Step 2) carries out tracking processing to the power grid three-phase voltage, to obtain mains frequency；
Step 3) is filtered the mains frequency, practical with the frequency for the power grid sub-synchronous oscillation that is inhibited
Value；
Step 4) by it is described inhibit power grid sub-synchronous oscillation frequency actual value and inhibit power grid sub-synchronous oscillation frequency
Reference value makes the difference, formed mains frequency deviation, and to the mains frequency deviation carry out proportional plus integral control, with obtain with
The corresponding control amount of the mains frequency deviation；
Step 5) carries out closed-loop control to control amount corresponding with the mains frequency deviation, with the power grid that is inhibited
The offset voltage of synchronized oscillation, to inhibit the sub-synchronous oscillation of power grid.
Preferably, in the step 1), the acquisition of power grid three-phase voltage is realized using the voltage sensor built in SVG.
Preferably, the step 2) specifically:
The power grid three-phase voltage is transformed into active voltage actual value and reactive voltage actual value by step 21)；
Step 22) carries out tracking processing to the reactive voltage actual value using phaselocked loop, to obtain the mains frequency.
Preferably, the step 21) specifically:
Make the power grid three-phase voltage under three-phase static coordinate system by abc/dq coordinate transform, obtains two-phase rotation and sit
The active voltage actual value and reactive voltage actual value under mark system.
Preferably, in the step 3), the mains frequency is filtered using modal filter, the mould
State filter includes sequentially connected low-pass filter, high-pass filter and bandpass filter, or including sequentially connected height
Bandpass filter, low-pass filter and bandpass filter.
Preferably, in the step 3), during the bandpass filter with the sub-synchronous oscillation frequency of its input signal is
Frequency of heart.
Preferably, in the step 3), the frequency range of the frequency actual value for inhibiting power grid sub-synchronous oscillation is 2
~50Hz.
Preferably, the step 5) specifically:
Step 51) makes control amount corresponding with the mains frequency deviation successively pass through direct current pressure ring and watt current
Ring processing, to form the first control amount；And control amount corresponding with the mains frequency deviation is made successively to pass through idle function
Rate ring and the processing of reactive current ring, to form the second control amount；
First control amount and second control amount are transformed into the control for inhibiting power grid sub-synchronous oscillation by step 52)
Amount；
Step 53) carries out pulse width modulation to the control amount for inhibiting power grid sub-synchronous oscillation, corresponding to generate
Driving signal, and the power electronic devices that turns off in SVG is controlled, to generate the compensation for inhibiting power grid sub-synchronous oscillation
Voltage, to inhibit the sub-synchronous oscillation of power grid.
Preferably, the step 51) specifically:
Will control amount corresponding with the mains frequency deviation as the additional given value of DC voltage, in the direct current
Addition DC voltage given value in additional given value is pressed, it is given to total DC voltage to obtain total DC voltage given value
Value and DC voltage actual value make the difference, and form active power offset value, carry out proportional integration control to the active power deviation
System will the control amount conduct corresponding with active power deviation to obtain control amount corresponding with active power deviation
Watt current given value makes the difference the watt current given value and watt current actual value, forms active current deviation value, right
The watt current deviation carries out proportional plus integral control, will to obtain control amount corresponding with the watt current deviation
The control amount is as the first control amount；And
Will control amount corresponding with the mains frequency deviation as the additional given value of reactive power, in the idle function
Reactive power given value is added in the additional given value of rate, it is given to total reactive power to obtain total reactive power given value
Value and reactive power actual value make the difference, and form reactive power deviation, carry out proportional integration control to the reactive power deviation
System will the control amount conduct corresponding with reactive power deviation to obtain control amount corresponding with reactive power deviation
Reactive current given value makes the difference the reactive current given value and reactive current actual value, forms reactive current deviation, right
The reactive current deviation carries out proportional plus integral control, will to obtain control amount corresponding with the reactive current deviation
The control amount is as the second control amount.
Preferably, the step 52) specifically:
First control amount and second control amount under two-phase rotating coordinate system is set to pass through dq/abc coordinate transform,
Obtain the control amount of the inhibition power grid sub-synchronous oscillation under three-phase static coordinate system.
The utility model has the advantages that
Dynamic of the present invention inhibits the Frequency servo method of power grid sub-synchronous oscillation in the bicyclic (electric current of existing SVG
Inner ring+DC voltage outer ring/reactive power outer ring) decouple addition mains frequency closed loop equivalent damping control plan in PI control strategy
Slightly, specifically, the frequency reference of the frequency actual value for inhibiting power grid sub-synchronous oscillation and inhibition power grid sub-synchronous oscillation is done
Difference forms mains frequency deviation, passes it through proportional plus integral control and forms control amount corresponding with the mains frequency deviation,
Using the control amount as the additional given value (rated value) of existing SVG DC voltage outer ring and reactive power outer ring, that is, right
It is idle for existing SVG using the control amount as the additional given value of its DC voltage for existing SVG DC voltage outer ring
For power outer ring, using the control amount as the additional given value of its reactive power, then by the bicyclic decoupling PI control of existing SVG
Corresponding control amount is generated after strategy processing, pulse width modulation is carried out to generate corresponding driving signal to the control amount, and
The power electronic devices that turns off in SVG is controlled, to generate the offset voltage for inhibiting power grid sub-synchronous oscillation, thus structure
PI control strategy is decoupled at current inner loop+DC voltage middle ring/reactive power middle ring+mains frequency outer ring tricyclic, and then existing
There is the sub-synchronous oscillation effectively compensated on the basis of SVG control strategy in (inhibition) power grid.As it can be seen that the present invention is existing
The control algolithm that online dynamic inhibits power grid sub-synchronous oscillation is increased on the basis of the bicyclic decoupling PI control strategy of SVG, and existing
There is SVG using full-control type power device, thus effectively can provide positive damping for wind power plant, effectively improves wind-force hair
The stability of electric system.
In addition, the present invention have the advantages that it is simple, be easily achieved, be at low cost, together compared to existing other inhibitions power grids time
The control strategy for walking oscillation can be such that SVG is rapidly exported more according to the real-time offset voltage for inhibiting power grid sub-synchronous oscillation
Add accurate active power and reactive power, to can effectively solve the sub-synchronous oscillation problem in power grid.
Detailed description of the invention
Fig. 1 is the Frequency servo side of the dynamic inhibition power grid sub-synchronous oscillation described in the embodiment of the present invention based on SVG
The flow chart of method；
Fig. 2 is the sub-process figure of step S200 in Fig. 1；
Fig. 3 is a kind of structural schematic diagram of modal filter described in the embodiment of the present invention；
Fig. 4 is another structural schematic diagram of modal filter described in the embodiment of the present invention；
Fig. 5 is the sub-process figure of step S500 in Fig. 1；
Fig. 6 is the Frequency servo side of the dynamic inhibition power grid sub-synchronous oscillation described in the embodiment of the present invention based on SVG
The application schematic diagram of method；
Fig. 7 a is using control method of the present invention and not using the active of the SVG output of control method of the present invention
The waveform diagram of power；
Fig. 7 b is using control method of the present invention and not using the idle of the SVG output of control method of the present invention
The waveform diagram of power；
Fig. 8 is using control method of the present invention and not using the motor torque of the SVG of control method of the present invention
Waveform diagram.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawings and examples to this
Invention is described in further detail.
In recent years, flexible AC transmitting system (FACTS, Flexible Alternative Current
Transmission Systems) it has obtained relatively broad application and develops.SVG based on full-control type power device (IGBT)
With its flexible control performance and quick dynamic characteristic, the favor of user is received, to be widely used in flexible AC
Transmission system.SVG (Static Var Generator, static reactive generator) be it is a kind of it is in parallel, can be carried out reactive compensation
Full-control type exchange transmission & distribution electric installation, can be adjusted in capacitive and perceptual range, fast response time, the present invention presses down using it
There is the sub-synchronous oscillation of power grid processed better damping to effectively improve to provide positive damping for wind power plant
The stability of wind generator system.The control strategy that the present invention uses includes: practical to the frequency for inhibiting power grid sub-synchronous oscillation
The filtering of value is screened, and the design of modal filter is realized, the design of mains frequency closed loop equivalent damping control strategy, and is based on
SVG inhibits the whole control scheme of power grid sub-synchronous oscillation, and below by specific embodiment, the present invention will be described in detail.
Embodiment:
As shown in Figure 1, the present embodiment provides a kind of, the online dynamic based on SVG inhibits the frequency of power grid sub-synchronous oscillation to close
Ring control method comprising following steps:
S100. power grid three-phase voltage u is acquireda,ub,uc。
Preferably, power grid three-phase voltage u is realized using the voltage sensor built in SVGa,ub,ucAcquisition.
S200. to power grid three-phase voltage ua,ub,ucTracking processing is carried out, to obtain mains frequency f.Using existing frequency
Rate tracking technique is to power grid three-phase voltage ua,ub,ucTracking processing is carried out to automatically track mains frequency to realize.
Preferably, as shown in Fig. 2, step S200 includes the following steps:
S201. by power grid three-phase voltage ua,ub,ucIt is transformed into active voltage actual value udWith reactive voltage actual value uq。
Preferably, step S201 specifically: make the power grid three-phase voltage u under three-phase static coordinate systema,ub,ucPass through abc/
Dq coordinate transform obtains the active voltage actual value u under two-phase rotating coordinate systemdWith reactive voltage actual value uq。
Specifically, to power grid three-phase voltage ua,ub,ucThree-phase-two-phase (3s/2r) coordinate transform is carried out, i.e., in three phase static
It is converted between coordinate system abc and two-phase rotating coordinate system dq, to obtain active voltage actual value udWith reactive voltage reality
Actual value uq.Formula used by three-phase-two-phase coordinate transform is as follows:
Parameter alpha in above formula is d axis and a axle clamp angle.
S202. using phaselocked loop (PLL, Phase Locked Loop) to reactive voltage actual value uqTracking processing is carried out,
To obtain mains frequency f.Since PHASE-LOCKED LOOP PLL TECHNIQUE belongs to the prior art, its structure and principle are repeated no more.
S300. mains frequency f is filtered, with the frequency actual value Δ f for the power grid sub-synchronous oscillation that is inhibited.
Wherein, the frequency range for inhibiting the frequency actual value Δ f of power grid sub-synchronous oscillation is 2~50Hz.
In step S300, mains frequency f is filtered using modal filter, modal filter includes successively
Low-pass filter, high-pass filter and the bandpass filter (as shown in Figure 3) of connection, or including sequentially connected high-pass filtering
Device, low-pass filter and bandpass filter (as shown in Figure 4).Preferably, bandpass filter is with the subsynchronous vibration of its input signal
Swinging frequency is center frequency.
Preferably, in modal filter, the cutoff frequency of low-pass filter is higher than the higher cut-off frequency of bandpass filter
Rate, the cutoff frequency of high-pass filter is lower than the lower-cut-off frequency of bandpass filter, so that low-pass filter and high-pass filtering
Device has first filtered out most of useless signal, using the narrow-band filtering of bandpass filter, effectively filters out and inhibits power grid
The ingredient of synchronized oscillation filters out the frequency actual value Δ f for inhibiting power grid sub-synchronous oscillation.
By taking sub-synchronous oscillation frequency values are 24Hz as an example, select the cutoff frequency of low-pass filter for 40Hz, high-pass filtering
The cutoff frequency of device is 10Hz, and the centre frequency of bandpass filter is 24Hz, then the transmission function G of low-pass filter1, high pass filter
The transmission function G of wave device2With the transmission function G of bandpass filter3It is as follows respectively:
S400. the frequency actual value Δ f for inhibiting power grid sub-synchronous oscillation and the frequency for inhibiting power grid sub-synchronous oscillation are joined
Examine value Δ frefMake the difference, formed mains frequency deviation, and to mains frequency deviation carry out proportional plus integral control, with obtain with
The corresponding control amount of mains frequency deviation.Wherein, inhibit the frequency reference Δ f of power grid sub-synchronous oscillationrefIt can be by this field
Technical staff is according to the actual conditions self-setting of power grid.
S500. closed-loop control is carried out to control amount corresponding with mains frequency deviation, it is subsynchronous with the power grid that is inhibited
The offset voltage of oscillation, to inhibit the sub-synchronous oscillation of power grid.
Specifically, as shown in figure 5, step S500 includes the following steps:
Pass through control amount corresponding with mains frequency deviation successively at direct current pressure ring and watt current ring
Reason, to form the first control amount；And control amount corresponding with mains frequency deviation is made successively to pass through reactive power ring and nothing
Function electric current loop processing, to form the second control amount.
Specifically, step S501 specifically:
Will control amount corresponding with mains frequency deviation as the additional given value Δ u of DC voltagedc_ref, in direct current
Press additional given value Δ udc_refMiddle addition DC voltage given value udc_ref, to obtain total DC voltage given value, to total direct current
Voltage given value and DC voltage actual value udcMake the difference, form active power offset value Δ P, to active power deviation Δ P into
Row proportional plus integral control will be P pairs of Δ with active power deviation to obtain control amount corresponding with active power deviation Δ P
The control amount answered is as watt current given value Id_ref, by watt current given value Id_refWith watt current actual value idIt makes the difference,
Active current deviation value is formed, proportional plus integral control is carried out to watt current deviation, to obtain and watt current deviation pair
The control amount answered, using the control amount as the first control amount；And
Will control amount corresponding with mains frequency deviation as the additional given value Δ Q of reactive powerm_ref, in reactive power
Additional given value Δ Qm_refMiddle addition reactive power given value Qm_ref, to obtain total reactive power given value, to total reactive power
Given value and reactive power actual value QmIt makes the difference, forms reactive power deviation Δ Q, reactive power deviation Δ Q is compared
Example integration control will be corresponding with reactive power deviation Δ Q to obtain control amount corresponding with reactive power deviation Δ Q
Control amount is as reactive current given value Iq_ref, by reactive current given value Iq_refWith reactive current actual value iqIt makes the difference, is formed
Reactive current deviation carries out proportional plus integral control to reactive current deviation, corresponding with reactive current deviation to obtain
Control amount, using the control amount as the second control amount.
Wherein, watt current actual value idWith reactive current actual value iqIt can obtain in the following way: (using built in SVG
Current sensor) acquisition power grid three-phase current ia,ib,ic；Make the power grid three-phase current i under three-phase static coordinate systema,ib,ic
By abc/dq coordinate transform, the watt current actual value i under two-phase rotating coordinate system is obtaineddWith reactive current actual value iq.Tool
Body, to power grid three-phase current ia,ib,icThree-phase-two-phase (3s/2r) coordinate transform is carried out, i.e., in three-phase static coordinate system abc
It is converted between two-phase rotating coordinate system dq, to obtain watt current actual value idWith reactive current actual value iq.Three
Formula used by phase-two-phase coordinate transform is as follows:
Parameter alpha in above formula is d axis and a axle clamp angle.
In the present embodiment, direct current pressure ring, reactive power ring, watt current ring and reactive current ring belong to existing SVG
Bicyclic (current inner loop+DC voltage outer ring/reactive power outer ring) decoupling PI control strategy, therefore above-mentioned DC voltage given value
udc_ref, DC voltage actual value udc, reactive power given value Qm_ref, reactive power actual value Qm, watt current actual value id、
Reactive current actual value iqIt is the known parameters in the bicyclic decoupling PI control strategy of existing SVG, which is not described herein again.
S502., first control amount and the second control amount are transformed into the control amount for inhibiting power grid sub-synchronous oscillation.
Preferably, the first control amount and the second control amount under two-phase rotating coordinate system is made to pass through dq/abc coordinate transform,
Obtain the control amount of the inhibition power grid sub-synchronous oscillation under three-phase static coordinate system.
Specifically, to the first control amount kdWith the second control amount kqTwo-phase-three-phase (2r/3s) coordinate transform is carried out, i.e., two
It is converted between cordic phase rotator system dq and three-phase static coordinate system abc, thus the control for the power grid sub-synchronous oscillation that is inhibited
Amount k processeda,kb,kc.Formula used by two-phase-three-phase coordinate transform is as follows:
Parameter alpha in above formula is d axis and a axis phase angle (angle).
S503. pulse width modulation is carried out to the control amount for inhibiting power grid sub-synchronous oscillation, to generate corresponding driving letter
Number, and the power electronic devices (full-controlled switch pipe, such as IGBT) that turns off in SVG is controlled, i.e. control is corresponding
Full-controlled switch pipe movement, to generate the offset voltage for inhibiting power grid sub-synchronous oscillation, to inhibit the sub-synchronous oscillation of power grid.
In practical applications, step S100 to step S500 moves in circles, and in other words, often collects one group of power grid three
Phase voltage ua,ub,uc, just it is handled according to method described in step S200 to step S500, to generate corresponding inhibition
The offset voltage of power grid sub-synchronous oscillation exports SVG according to the real-time offset voltage for inhibiting power grid sub-synchronous oscillation accurate
Active power and reactive power, so as to dynamic, effectively inhibit the sub-synchronous oscillation of power grid.Moreover, the present embodiment institute
State control method can be by being added mains frequency closed loop equivalent damping control strategy in the bicyclic decoupling PI control strategy of existing SVG
It realizes, to save cost to a certain extent.
In the present embodiment, digital signal processor (DSP, Digital Signal is can be used in the control method
Processing) realize there is online, real-time perfoming digital operation.When real using the voltage sensor built in SVG
When the acquisition of existing power grid three-phase voltage, since the signal of voltage sensor output can not be identified directly by DSP, the control
It also needs to carry out step S200 again after the signal that voltage sensor exports first is converted into the readable signal of DSP in method.
Inhibit the frequency of power grid sub-synchronous oscillation using the dynamic based on SVG that DSP is realized below with reference to Fig. 6 detailed description
Closed loop control method.In Fig. 6, PLL indicates that phase-locked loop module, PI indicate pi controller (i.e. PI controller), and PWM is indicated
Pulse width modulation module (i.e. PWM module).
Power grid three-phase voltage u is acquired using the voltage sensor built in SVG in real timea,ub,uc；Make under three-phase static coordinate system
Power grid three-phase voltage ua,ub,ucBy abc/dq coordinate transform, the active voltage actual value under two-phase rotating coordinate system is obtained
udWith reactive voltage actual value uq, by reactive voltage actual value uqOutput is to PLL, by PLL to reactive voltage actual value uqCarry out with
Track processing obtains mains frequency f, and exports to modal filter, successively carries out low pass filtered to mains frequency f by modal filter
Wave, high-pass filtering and bandpass filtering treatment will inhibit power grid with the frequency actual value Δ f for the power grid sub-synchronous oscillation that is inhibited
The frequency actual value Δ f of the sub-synchronous oscillation and frequency reference Δ f for inhibiting power grid sub-synchronous oscillationrefIt makes the difference, forms power grid frequency
Rate deviation；Mains frequency deviation is exported respectively to two PI controllers, by the two PI controllers (referred to as PI1 and
PI2 proportional plus integral control) is carried out to mains frequency deviation respectively, to obtain two respectively and the corresponding control of mains frequency deviation
Amount processed, one of them and the corresponding control amount of mains frequency deviation are as the additional given value Δ u of DC voltagedc_ref, in direct current
Press additional given value Δ udc_refMiddle addition DC voltage given value udc_ref, to obtain total DC voltage given value, to total direct current
Voltage given value and DC voltage actual value udcIt makes the difference, forms active power offset value Δ P, and export to PI controller (referred to as
PI3), proportional plus integral control is carried out to active power deviation Δ P by the PI controller, obtained and active power deviation Δ
The corresponding control amount of P, will control amount corresponding with active power deviation Δ P as watt current given value Id_ref, will be active
Given value of current value Id_refWith watt current actual value idIt makes the difference, forms active current deviation value, and export to PI controller (referred to as
PI5), proportional plus integral control is carried out to watt current deviation by the PI controller, obtained corresponding with watt current deviation
Control amount, using the control amount as the first control amount；And another and the corresponding control amount of mains frequency deviation are as nothing
The additional given value Δ Q of function powerm_ref, in the additional given value Δ Q of reactive powerm_refMiddle addition reactive power given value Qm_ref, with
Total reactive power given value is obtained, to total reactive power given value and reactive power actual value QmIt makes the difference, it is inclined to form reactive power
Difference DELTA Q, and export to PI controller (referred to as PI4), ratio product is carried out to reactive power deviation Δ Q by the PI controller
Sub-control system will control amount conduct corresponding with reactive power deviation to obtain control amount corresponding with reactive power deviation
Reactive current given value Iq_ref, by reactive current given value Iq_refWith reactive current actual value iqIt makes the difference, it is inclined to form reactive current
Difference, and export to PI controller (referred to as PI6), proportional integration control is carried out to reactive current deviation by the PI controller
System, to obtain control amount corresponding with reactive current deviation, using the control amount as the second control amount；Make two cordic phase rotators
The first control amount and the second control amount under system obtain the inhibition power grid under three-phase static coordinate system by dq/abc coordinate transform
The control amount of sub-synchronous oscillation, and export to PWM module；PWM module is same to power grid time is inhibited in such a way that pulse width is modulated
The control amount of step oscillation is modulated, and to generate corresponding driving signal, and it is dynamic to control corresponding full-controlled switch pipe in SVG
Make, to generate the offset voltage for inhibiting power grid sub-synchronous oscillation, so that dynamic inhibits the sub-synchronous oscillation of power grid.It needs to illustrate
It is DC voltage given value udc_ref, DC voltage actual value udc, reactive power given value Qm_ref, reactive power actual value Qm、
Watt current actual value id, reactive current actual value iqIt is the known parameters in the bicyclic decoupling PI control strategy of existing SVG.
The present invention has also carried out simulating, verifying to the control method, and simulation result is as shown in Fig. 7 a, Fig. 7 b and Fig. 8, figure
7a is using control method of the present invention and not using the waveform of the SVG of the control method of the present invention active power exported
Figure, Fig. 7 b are the reactive power that using control method of the present invention and the SVG of application control method of the present invention is not exported
Waveform diagram, Fig. 8 be using control method of the present invention and do not apply control method of the present invention SVG motor torque
Waveform diagram, and in analogous diagram solid line be application control method of the present invention obtained from simulation waveform, dotted line be it is existing
The simulation waveform of technology, it can be seen that control method of the present invention restrained effectively the wave of the active power of SVG output
The fluctuation of the output torque of the dynamic, fluctuation of reactive power and electrode, thus demonstrate the accuracy of control method of the present invention,
Simplification and reliability provide good reference value for engineer application.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a kind of Frequency servo method for inhibiting power grid sub-synchronous oscillation based on SVG dynamic, which is characterized in that the control
Method includes the following steps:
Step 1) acquires power grid three-phase voltage；
Step 2) carries out tracking processing to the power grid three-phase voltage, to obtain mains frequency；
Step 3) is filtered the mains frequency, with the frequency actual value for the power grid sub-synchronous oscillation that is inhibited；
Step 4) by it is described inhibit power grid sub-synchronous oscillation frequency actual value and inhibit power grid sub-synchronous oscillation frequency reference
Value makes the difference, formed mains frequency deviation, and to the mains frequency deviation carry out proportional plus integral control, with obtain with it is described
The corresponding control amount of mains frequency deviation；
Step 5) carries out closed-loop control to control amount corresponding with the mains frequency deviation, subsynchronous with the power grid that is inhibited
The offset voltage of oscillation, to inhibit the sub-synchronous oscillation of power grid；
The step 5) specifically:
Step 51) passes through control amount corresponding with the mains frequency deviation successively at direct current pressure ring and watt current ring
Reason, to form the first control amount；And control amount corresponding with the mains frequency deviation is made successively to pass through reactive power ring
It is handled with reactive current ring, to form the second control amount；
First control amount and second control amount are transformed into the control amount for inhibiting power grid sub-synchronous oscillation by step 52)；
Step 53) carries out pulse width modulation to the control amount for inhibiting power grid sub-synchronous oscillation, to generate corresponding driving
Signal, and the power electronic devices that turns off in SVG is controlled, to generate the compensation electricity for inhibiting power grid sub-synchronous oscillation
Pressure, to inhibit the sub-synchronous oscillation of power grid.
2. control method according to claim 1, which is characterized in that in the step 1), using the voltage built in SVG
The acquisition of sensor realization power grid three-phase voltage.
3. control method according to claim 1, which is characterized in that the step 2) specifically:
The power grid three-phase voltage is transformed into active voltage actual value and reactive voltage actual value by step 21)；
Step 22) carries out tracking processing to the reactive voltage actual value using phaselocked loop, to obtain the mains frequency.
4. control method according to claim 3, which is characterized in that the step 21) specifically:
Make the power grid three-phase voltage under three-phase static coordinate system by abc/dq coordinate transform, obtains two-phase rotating coordinate system
Under the active voltage actual value and reactive voltage actual value.
5. control method according to claim 1, which is characterized in that in the step 3), using modal filter pair
The mains frequency is filtered, the modal filter include sequentially connected low-pass filter, high-pass filter and
Bandpass filter, or including sequentially connected high-pass filter, low-pass filter and bandpass filter.
6. control method according to claim 5, which is characterized in that in the step 3), the bandpass filter with
The sub-synchronous oscillation frequency of its input signal is center frequency.
7. control method according to claim 1, which is characterized in that in the step 3), the inhibition power grid time is same
The frequency range for walking the frequency actual value of oscillation is 2~50Hz.
8. the method according to claim 1, wherein the step 51) specifically:
Will control amount corresponding with the mains frequency deviation as the additional given value of DC voltage, in the DC voltage volume
DC voltage given value is added in outer given value, to obtain total DC voltage given value, to total DC voltage given value and
DC voltage actual value makes the difference, and forms active power offset value, carries out proportional plus integral control to the active power deviation, with
Control amount corresponding with active power deviation is obtained, by the control amount corresponding with active power deviation as active electricity
Given value is flowed, the watt current given value and watt current actual value are made the difference, active current deviation value is formed, has to described
Function current deviation value carries out proportional plus integral control, to obtain control amount corresponding with the watt current deviation, by the control
Amount is used as the first control amount；And
Will control amount corresponding with the mains frequency deviation as the additional given value of reactive power, in the reactive power volume
Reactive power given value is added in outer given value, to obtain total reactive power given value, to total reactive power given value and
Reactive power actual value makes the difference, and forms reactive power deviation, carries out proportional plus integral control to the reactive power deviation, with
Control amount corresponding with reactive power deviation is obtained, by the control amount corresponding with reactive power deviation as idle electricity
Given value is flowed, the reactive current given value and reactive current actual value are made the difference, reactive current deviation is formed, to the nothing
Function current deviation value carries out proportional plus integral control, to obtain control amount corresponding with the reactive current deviation, by the control
Amount is used as the second control amount.
9. the method according to claim 1, wherein the step 52) specifically:
So that first control amount and second control amount under two-phase rotating coordinate system is passed through dq/abc coordinate transform, obtains
The control amount of the inhibition power grid sub-synchronous oscillation under three-phase static coordinate system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510317896.0A CN106300386B (en) | 2015-06-10 | 2015-06-10 | Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510317896.0A CN106300386B (en) | 2015-06-10 | 2015-06-10 | Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106300386A CN106300386A (en) | 2017-01-04 |
| CN106300386B true CN106300386B (en) | 2019-06-04 |
Family
ID=57658839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510317896.0A Active CN106300386B (en) | 2015-06-10 | 2015-06-10 | Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106300386B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732939B (en) * | 2017-10-19 | 2020-07-10 | 国家电网公司 | Subsynchronous oscillation suppression control method based on voltage source type converter decoupling control |
| CN107895957A (en) * | 2017-12-15 | 2018-04-10 | 华北电力科学研究院有限责任公司 | A kind of subsynchronous resonance and reactive power complex control system and method |
| DE102018116444A1 (en) | 2018-07-06 | 2020-01-09 | Wobben Properties Gmbh | Method of controlling a wind farm |
| CN111313436A (en) * | 2020-03-23 | 2020-06-19 | 云南电网有限责任公司 | Wind power system control method and device for avoiding resonance |
| CN114280363B (en) * | 2021-09-27 | 2024-05-10 | 金风科技股份有限公司 | Power grid frequency detection method and device and power grid frequency adjustment method and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333022A (en) * | 2014-11-17 | 2015-02-04 | 荣信电力电子股份有限公司 | Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2863999A1 (en) * | 2013-02-01 | 2014-08-07 | Abb Technology Ag | Method and apparatus for mitigating sub-synchronous resonance in power transmission system |
-
2015
- 2015-06-10 CN CN201510317896.0A patent/CN106300386B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333022A (en) * | 2014-11-17 | 2015-02-04 | 荣信电力电子股份有限公司 | Method for restraining subsynchronous oscillation caused by grid connection of draught fan based on SVG |
Non-Patent Citations (1)
| Title |
|---|
| 兼顾阻尼抑制和电压支撑的动态无功补偿装置控制方法;袁志昌等;《电力自动化设备》;20131010;第33卷(第10期);第74-78页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106300386A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106300386B (en) | Frequency closed-loop control method for dynamically inhibiting subsynchronous oscillation of power grid based on SVG | |
| CN105006834B (en) | Optimum virtual inertia control method based on virtual synchronous generator | |
| CN109149620B (en) | Self-energy-storage multi-terminal flexible-straight system control method and system | |
| CN110021953B (en) | Direct-current side voltage control method of flexible multi-state switch during power grid voltage unbalance | |
| CN105790270B (en) | Suppress the method and device of subsynchronous resonance by double-fed fan rotor side converter | |
| CN107317345A (en) | It is a kind of to be electrolysed the method that type load participates in island network FREQUENCY CONTROL | |
| CN103972899B (en) | A kind of STATCOM access point voltage compensating method | |
| CN106451470A (en) | Grid-side converter control method of dual-feed motor under voltage unbalance of power grid | |
| CN107919681A (en) | A kind of quasi- virtual synchronous machine control method | |
| CN109586337A (en) | VSC grid-connected system sub-synchronous oscillation methods of risk assessment based on Modeling In Frequency Domain | |
| CN110661273A (en) | Damping control method and system for inhibiting low-frequency oscillation and subsynchronous oscillation | |
| CN109449941A (en) | Voltage source operating mode active filter control method based on virtual impedance control | |
| CN106300385B (en) | Frequency closed-loop control method for dynamically inhibiting low-frequency oscillation of power grid based on SVG | |
| CN105514972B (en) | The PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults | |
| CN107017812A (en) | The device and control method of a kind of self-excitation asynchronous generator | |
| CN102570950B (en) | Subsynchronous damping control system and subsynchronous damping control method for generator terminals | |
| CN109149598B (en) | Subsynchronous oscillation suppression method and system based on power grid near-end phase locking | |
| CN105529732B (en) | A kind of Multi-end flexible direct current transmission system decoupling control method of local DC voltage feedback | |
| CN104779632B (en) | Based on the energy storage system control method under different mode in micro-capacitance sensor | |
| CN103259290B (en) | A kind of double-fed generator net side converter direct voltage control method of no phase-locked loop | |
| CN102651550A (en) | Sub-synchronous oscillation suppression method based on controllable series compensation additional impedance deviation control | |
| Chen | A control strategy of islanded microgrid with nonlinear load for harmonic suppression | |
| CN104393609B (en) | Static Synchronous generator failure traversing control method | |
| CN106300387A (en) | Given feedforward control method for dynamically inhibiting low-frequency oscillation of power grid based on SVG | |
| CN103490423B (en) | Wind-farm reactive instruction distribution method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |