CN109217335A - A kind of low-frequency oscillation damping control method of offshore wind farm VSC-HVDC output system - Google Patents
A kind of low-frequency oscillation damping control method of offshore wind farm VSC-HVDC output system Download PDFInfo
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- CN109217335A CN109217335A CN201810962582.XA CN201810962582A CN109217335A CN 109217335 A CN109217335 A CN 109217335A CN 201810962582 A CN201810962582 A CN 201810962582A CN 109217335 A CN109217335 A CN 109217335A
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- 238000012857 repacking Methods 0.000 claims description 13
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/386—
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of low-frequency oscillation damping control methods of offshore wind farm VSC-HVDC output system；Specially at sea wind-powered electricity generation needs to add damping controller and carrys out power oscillation damping through in VSC-HVDC output system, in alternating current-direct current combined hybrid system, direct current system is operated under rated power state, and AC system is caused low-frequency oscillation by large disturbances.The present invention only needs only to need a proportional component and filtering link plus the prime control based on frequency in the DC voltage control of VSC-HVDC converter station；The variation of frequency signal is transmitted on DC voltage when generating low-frequency oscillation after AC network disturbs, DC voltage can cause active power to change accordingly in variation, the low-frequency oscillation of dfamped alternating current system, it can not only keep the stable operation of converter station, the AC system low-frequency oscillation connected simultaneously to it provides preferable damping, has ensured the safe and stable operation and power grid friendly of VSC-HVDC direct current system.
Description
Technical field
The invention belongs to safe operation of power system fields, (are based on more particularly, to a kind of offshore wind farm VSC-HVDC
The D.C. high voltage transmission of voltage source converter, Voltage Source Converter based High Voltage Direct
Current Transmission) output system AC electric power systems low-frequency oscillation damping control method.
Background technique
Low-frequency oscillation is the build-in attribute of electric system, and lasting oscillation will limit the transmission capacity of transmission line of electricity, seriously
When result even in system sectionalizing.The frequency range of low-frequency oscillation is generally 0.1~2Hz, is directed to send out in a power plant
Oscillation between motor and power grid other parts, referred to as Local oscillating (about 1~2Hz)；Be related between region more generators it
Between oscillation, referred to as inter-area oscillations (about 0.1~0.7Hz).
The commonly used measure of power oscillation damping is to install power system stability additional for the field regulator of synchronous generator
Device (power system stabilization, PSS) provides positive damping torque for generator.With power electronics skill in recent years
The fast development of art and the addition of wind-powered electricity generation and photovoltaic, HVDC transmission system (high voltage DC, HVDC) are extensive
For increasing line transmission capacity, reducing line loss, improve stability of power system and safety.With this variation, tradition resistance
Buddhist nun's control means will be difficult to the independent new change coping with Operation of Electric Systems characteristic and occurring.Joining sufficiently to excavate generation of electricity by new energy
With the potentiality in terms of damping frequencies oscillation, the power grid to offshore wind farm VSC-HVDC output system is needed to provide new damping control
Scheme.
Summary of the invention
For the Improvement requirement of the prior art, the present invention provides a kind of exchanges of offshore wind farm VSC-HVDC output system
Low-frequency oscillation of electric power system damping control schemes, using the output power regulating power of blower, by wind-power electricity generation through VSC-
The increased additional longitudinal forces of HVDC output system increase system damping, improve the safe and stable operation ability of system.
The present invention provides a kind of AC electric power systems low-frequency oscillation damping controls of offshore wind farm VSC-HVDC output system
Method processed, includes the following steps:
(1) the grid entry point three-phase voltage U of DC transmission system inverter side converter station is acquiredabc, three-phase current iabcAnd direct current
Voltage Udc；
(2) for the voltage signal Uabc, obtain what DC transmission system inverter side converter station was connected by phaselocked loop
AC network frequencies omegag；
For the voltage signal UabcWith the three-phase current iabc, calculated by instantaneous power and obtain DC transmission system
The reactive power Q of inverter side converter station output；
(3) according to the AC network frequencies omegagObtain the DC voltage reference of DC transmission system inverter side converter station
Value Udc_ref；
(4) according to the direct voltage reference value Udc_refWith the DC voltage detection value Udc, direct current system inverter side changes
Flow the reactive power reference qref Q at stationrefIt converts to obtain electric current d repacking measured value i with reactive power calculating value Q and alternating current dqdWith
Q repacking measured value iqDriving signal S is calculatedabc, and the current transformer of VSC-HVDC inverter side converter station is driven to realize that low frequency shakes
The damping control swung.
Further, step (3) specifically includes:
AC network frequency reference signal is subtracted into the AC network frequencies omegagAfter carry out low-pass filtering, through low pass filtered
Signal after wave is added using after gain adjustment with the basic reference signal of DC voltage, obtains VSC-HVDC DC transmission system
The direct voltage reference value U of inverter side converter stationdc_ref。
Wherein, AC network frequency reference signal can be 1, and the basic reference signal of DC voltage can be 1.
Further, step (4) specifically includes:
To the direct voltage reference value Udc_refWith the DC voltage detection value UdcAlternating current is obtained after carrying out PI control
Flow d axis reference value id_ref；Wherein, PI controller includes scale coefficient kp_dcWith integral coefficient ki_dc, in real system
The two parameters need to be adjusted according to real system, input the relationship with output are as follows:
To the reactive power reference qref Q of direct current system inverter side converter stationrefPI control is carried out with reactive power calculating value Q
Alternating current q axis reference value i is obtained afterwardsq_ref；Wherein, PI controller includes proportionality coefficient kp_qWith integral coefficient ki_q, practical to be
The two parameters in system need to be adjusted according to real system, input the relationship with output are as follows:
To the alternating current d axis reference value id_ref, the alternating current q axis reference value iq_refWith the alternating current
The electric current d repacking measured value i that dq is converteddWith q repacking measured value iqThe driving signal S is obtained after carrying out current controlabc；Its
In, current control includes d shaft current and the control of q shaft current, a PI controller (usually using same set of parameter) is respectively corresponded,
Parameter includes a proportionality coefficient kp_iWith integral coefficient ki_i, the two parameters in real system need to carry out according to real system
It adjusts, the relationship of input and output are as follows:Resulting UD, q_conThrough
It crosses a PWM modulation unit and generates the driving signal Sabc。
In general, contemplated above technical scheme through the invention, it is only necessary in the direct current of VSC-HVDC converter station
Voltage control only needs a proportional component and filtering link plus the prime control based on frequency.It is disturbed in AC network
When generating low-frequency oscillation afterwards, which is transmitted to the variation of frequency signal on DC voltage, and DC voltage is in variation
Active power can be caused to change accordingly, the low-frequency oscillation of dfamped alternating current system can not only keep the stable operation of converter station,
The AC system low-frequency oscillation connected simultaneously to it provides preferable damping, has ensured VSC-HVDC direct current system
Safe and stable operation and power grid friendly.
Detailed description of the invention
Fig. 1 is measurement system diagram of the offshore wind farm through VSC-HVDC output system；
Fig. 2 is the control structure figure of VSC-HVDC direct current system inverter side converter station；
Fig. 3 is the control structure figure of additional longitudinal forces；
Fig. 4 is the synchronous generator speed oscillation comparison diagram using different control modes；
Fig. 5 is the synchronous generator oscillation of power comparison diagram using different control modes.
Specific embodiment
It is right below in conjunction with attached drawing and embodiment in order to be more clearly understood that the purpose of the present invention, technical solution and advantage
The present invention is described in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention,
It is not intended to limit the present invention.
The bridge-type MMC alternating voltage of the embodiment of the present invention promotes operation method and includes the following steps:
(1) the grid entry point three-phase voltage U of DC transmission system inverter side converter station is acquiredabc, three-phase current iabc, direct current
Press UdcFor input signal；
(2) for grid entry point three-phase voltage U collectedabc, the change of current of DC transmission system inverter side is obtained by phaselocked loop
It stands the frequencies omega of connected AC networkg；For grid entry point three-phase voltage U collectedabc, three-phase current iabc, pass through wink
When power calculator obtain DC transmission system inverter side converter station output reactive power Q；Three-phase current iabcIt is converted by dq
Obtain alternating current d repacking measured value idWith q repacking measured value iq；
(3) the AC network frequencies omega exported by phaselocked loopgVSC-HVDC direct current transportation is obtained by damping controller
The direct voltage reference value U of system inverter side converter stationdc_ref；
Wherein, step (3) specifically includes: damping controller is made of two parts, and one is low-pass filtering link, another
A is gain link, and AC network frequency reference signal (usually 1) subtracts the AC network frequencies omega of phaselocked loop outputgAfterwards,
Be input to low-pass filtering link, low-pass filtering link output signal is input to gain link again, output signal again with DC voltage
After basic reference signal (usually 1) is added, the DC voltage ginseng of VSC-HVDC DC transmission system inverter side converter station is obtained
Examine value Udc_ref。
(4) according to obtained direct voltage reference value Udc_refWith DC voltage UdcDetected value, the direct current system inverter side change of current
The reactive power reference qref Q to standrefIt converts to obtain electric current d repacking measured value i with reactive power calculating value Q and alternating current dqdAnd q
Repacking measured value iqDriving signal S is calculatedabc, and the current transformer of VSC-HVDC inverter side converter station is driven to realize that low frequency shakes
The damping control swung.
Wherein, step (4) specifically includes: according to obtained direct voltage reference value Udc_refWith DC voltage detection value Udc,
The two signals are input to a PI controller, output obtains the reactive power reference qref of alternating current system inverter side converter station
QrefThe two signals are input to a PI controller by (usually 0) and reactive power calculating value Q, and output obtains alternating current
Q axis reference value iq_ref；Obtained alternating current d axis reference value id_ref, alternating current q axis reference value iq_refWith alternating current dq
Transformation obtains electric current d repacking measured value idWith q repacking measured value iqIt is input to current controller, driving signal S is calculatedabc。
In order to enable those skilled in the art to better understand the present invention, combined with specific embodiments below to a kind of sea of the invention
The AC electric power systems low-frequency oscillation damping control method of upper wind-powered electricity generation VSC-HVDC output system is described in detail.
Fig. 1 shows a typical system diagram of the offshore wind farm through VSC-HVDC output system: the system is by a sea
Upper wind power plant, a VSC-HVDC DC transmission system, the AC network containing a synchronous generator are constituted.Marine wind electric field with
The rectification side converter station of VSC-HVDC DC transmission system connects, and inverter side converter station is connect with AC network.Offshore wind farm
Field converts wind energy into electric energy, and the rectification side converter station of VSC-HVDC DC transmission system converts the alternating current of marine wind electric field
For direct current, by the way that direct current is converted to alternating current by inverter side converter station again after DC power transmission line, in this way by sea turn
The power transmission of electric field is to AC network.The rectification side converter station of VSC-HVDC DC transmission system, which uses, determines alternating current voltage frequency
It is controlled with amplitude, inverter side converter station, which uses, determines DC voltage and idle control.Required damping controller is mounted on VSC-
The inverter side converter station of HVDC direct current system.Grid entry point AC three-phase voltage U in figureabc, three-phase current iabc, DC voltage Udc,
It is the signal for needing to acquire relevant to the embodiment of the present invention.
Fig. 2 shows the controls of the VSC-HVDC direct current system inverter side converter station of the damping controller of present example offer
Structure chart processed: the controller include DC voltage control, damping controller, Reactive Power Control, current control, phaselocked loop and
Instantaneous power calculator and dq transformation.Phaselocked loop passes through grid entry point AC three-phase voltage UabcThe frequency of AC network is calculated
ωgAnd phase thetaPLL, frequencies omega that damping controller passes through AC networkgObtain direct voltage reference value Udc_ref.Instantaneous power meter
Calculate the three-phase voltage U that device will obtainabc, three-phase current iabc, convert to obtain the α axis component U of network voltage using CLARKEα, β axis
Component Uβ, and instantaneous reactive power Q is calculated according to formula (1):
Direct voltage reference value Udc_refWith DC voltage detection value UdcD is obtained by the PI controller of DC voltage control
Shaft current reference value id_ref；Reactive power Q and reactive power reference qref QrefPI controller by idle control obtains q axis electricity
Flow reference value iq_ref；D shaft current reference value id_refWith q shaft current reference value iq_refThe d axis electricity converted with alternating current dq
Flow id, q shaft current iqCurrent transformer driving signal is obtained through overcurrent controller, drives the unsteady flow of VSC-HVDC inverter side converter station
Device.
Fig. 3 shows the specific control structure figure of additional damping controller.In figure 2 it can be seen that additional longitudinal forces
For device in the prime of DC voltage controller, primary structure is a low-pass filtering link and a gain link.AC network
Frequencies omegagAfter subtracting each other with frequency reference (usually 1), low-pass filtering link is first passed through, then by gain link, with direct current
Voltage reference reference value (usually 1) obtains actual direct voltage reference value U after being addeddc_ref.Additional damping controller it is defeated
Enter output relation are as follows:
The effect of low-pass filtering link is to filter off the frequencies omega of AC networkgHigh-frequency signal, gain link is adjustable practical
The damping of damping controller.Additional damping controller is according to the frequencies omega of AC networkgVariation adjust DC voltage ginseng
Examine value Udc_ref.The inverter side control of VSC-HVDC can adjust actual DC voltage according to the variation of direct voltage reference value, from
And corresponding active power variation, the variation of dfamped alternating current frequency, to reach power oscillation damping can be generated in exchange side
Effect.
For the alternating current of further description offshore wind farm VSC-HVDC output system provided in an embodiment of the present invention
Force system low-frequency oscillation damping control method is described in detail as follows now in conjunction with attached drawing and Case Simulation:
Fig. 1 is the offshore wind farm using Matlab/Simulink simulation software through the test system of VSC-HVDC output system
System figure；Fig. 2 is the control structure figure of VSC-HVDC direct current system inverter side converter station；Fig. 3 is the control knot of additional longitudinal forces
Composition；Fig. 4 is the synchronous generator speed oscillation comparison diagram using different control modes；Fig. 5 is using different control modes
Synchronous generator oscillation of power comparison diagram.
It is defeated through VSC-HVDC direct current that referring to Fig.1~Fig. 2, Fig. 4~Fig. 5 are set forth that whether there is or not the offshore wind farms of damping control
The synchronous generator speed oscillation after disturbance and oscillation of power situation of system out.Occur it can be seen from Fig. 4-Fig. 5 in system
After disturbance, there is the oscillation of the system revolving speed and power of damping control convergent faster, illustrate that damping controller plays inhibition
The effect of oscillation.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of AC electric power systems low-frequency oscillation damping control method of offshore wind farm VSC-HVDC output system, feature exist
In including the following steps:
(1) the grid entry point three-phase voltage U of DC transmission system inverter side converter station is acquiredabc, three-phase current iabcAnd DC voltage
Udc；
(2) for the voltage signal Uabc, the exchange that DC transmission system inverter side converter station is connected is obtained by phaselocked loop
Mains frequency ωg；
For the voltage signal UabcWith the three-phase current iabc, calculated by instantaneous power and obtain DC transmission system inversion
The reactive power Q of side converter station output；
(3) according to the AC network frequencies omegagObtain the direct voltage reference value of DC transmission system inverter side converter station
Udc_ref；
(4) according to the direct voltage reference value Udc_refWith the DC voltage detection value Udc, direct current system inverter side converter station
Reactive power reference qref QrefIt converts to obtain electric current d repacking measured value i with reactive power calculating value Q and alternating current dqdWith q axis
Detected value iqDriving signal S is calculatedabc, and drive the current transformer of VSC-HVDC inverter side converter station to realize low-frequency oscillation
Damping control.
2. AC electric power systems low-frequency oscillation damping control method as described in claim 1, which is characterized in that step (3) tool
Body includes:
AC network frequency reference signal is subtracted into the AC network frequencies omegagAfter carry out low-pass filtering, after low-pass filtered
Signal is added using after gain adjustment with the basic reference signal of DC voltage, obtains VSC-HVDC DC transmission system inverter side
The direct voltage reference value U of converter stationdc_ref。
3. AC electric power systems low-frequency oscillation damping control method as claimed in claim 2, which is characterized in that the alternating current
Net frequency reference signal is 1, and the basic reference signal of DC voltage is 1.
4. AC electric power systems low-frequency oscillation damping control method as described in any one of claims 1-3, which is characterized in that step
Suddenly (4) specifically include:
To the direct voltage reference value Udc_refWith the DC voltage detection value UdcAlternating current d is obtained after carrying out PI control
Axis reference value id_ref；
To the reactive power reference qref Q of direct current system inverter side converter stationrefIt is obtained after carrying out PI control with reactive power calculating value Q
Obtain alternating current q axis reference value iq_ref；
To the alternating current d axis reference value id_ref, the alternating current q axis reference value iq_refIt is converted with the alternating current dq
Obtained electric current d repacking measured value idWith q repacking measured value iqThe driving signal S is obtained after carrying out current controlabc。
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| CN110323775A (en) * | 2019-07-29 | 2019-10-11 | 国网经济技术研究院有限公司 | A kind of damping control method improving soft straight power grid DC port stability |
| CN110829478A (en) * | 2019-10-30 | 2020-02-21 | 浙江大学 | Low-frequency alternating-current uncontrolled rectification power transmission system of offshore wind power plant |
| CN111594384A (en) * | 2020-07-22 | 2020-08-28 | 中国电力科学研究院有限公司 | Control method and master control system for voltage source type wind turbine generator system |
| CN111668856A (en) * | 2020-03-31 | 2020-09-15 | 中国南方电网有限责任公司 | Current control-based high-frequency oscillation suppression method and system for flexible direct current transmission system |
| CN111697595A (en) * | 2020-06-18 | 2020-09-22 | 华中科技大学 | Frequency dynamic optimization control method and system of virtual synchronous fan |
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| CN112103985A (en) * | 2020-09-29 | 2020-12-18 | 国网江苏省电力有限公司电力科学研究院 | Cascade type hybrid direct current inversion side robust control method, device and system |
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