CN106972511A - The directly driven wind-powered sub-synchronous oscillation suppression method optimized based on net side control loop - Google Patents
The directly driven wind-powered sub-synchronous oscillation suppression method optimized based on net side control loop Download PDFInfo
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- CN106972511A CN106972511A CN201710279406.1A CN201710279406A CN106972511A CN 106972511 A CN106972511 A CN 106972511A CN 201710279406 A CN201710279406 A CN 201710279406A CN 106972511 A CN106972511 A CN 106972511A
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- synchronous oscillation
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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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Abstract
A kind of directly driven wind-powered sub-synchronous oscillation suppression method optimized based on net side control loop, is comprised the following steps：Step 1: in direct-drive type blower fan net side control loop, by measuring the component i for obtaining inverter control loop current in d axlesgdAndCorrection igd′；Step 2: to the correction electric current i of control loopgd' be filtered, obtain electric current igd' in subsynchronous component igdsub；Step 3: the time delay caused according to filtering, obtains feeding back to the voltage signal U of outer voltage after phase compensationsub；Step 4: building PI controllers, the voltage signal U of outer voltage will be fed back tosubWith DC capacitor voltage Udc, DC reference voltage UrefCollectively as the input quantity of outer shroud PI controllers, sub-synchronous oscillation suppression is carried out.The present invention can suppress without extra equipment and complicated controlling unit to the vibration of each subsynchronous frequency range, widely applicable.
Description
Technical field
The invention belongs to field of power, it is related to wind-electricity integration operation and control technology, and in particular to one kind is based on net
The directly driven wind-powered sub-synchronous oscillation suppression method of side control loop optimization.
Background technology
At present, grid-connected send outside of the extensive centralization of wind-powered electricity generation has become most commonly used wind-powered electricity generation and sends form, direct-drive type wind outside
The advantages of machine relies on its simple in construction, high efficiency and high reliability is increasingly becoming one of type of main flow.
But cluster wind-powered electricity generation string reissues transmission system and there is larger sub-synchronous oscillation risk, therefore direct-drive type blower fan is handed over weak
When flowing power network interaction, the oscillation of power for subsynchronous frequency range (2~50Hz) that happened occasionally in system, and sub-synchronous oscillation
The consequence such as blower fan off-grid and crowbar circuit damage can be caused, the safe operation of power network is seriously threatened.
Permanent magnet direct-drive Wind turbines shafting nature torsion frequency is relatively low (1-10Hz), and permanent magnet direct-drive wind turbine passes through
Double PWM converters isolates with power system back-to-back, thus the sub-synchronous oscillation that occurs of direct-drive wind power grid-connection with it is traditional it is secondary together
Step vibration is different, and it is a kind of vibration of electromagnetic power, is not related between the torsional oscillation of rotor axial system and blower fan and network system
Series compensation device.Therefore, it is traditional to extract and utilize the braking measure in tach signal based on subsynchronous component simultaneously
It is not applied for the suppression of direct drive wind power sub-synchronous oscillation.The inherent mechanism not ten of sub-synchronous oscillation occurs for direct-drive type blower fan
Clearly demarcated true, its frequency range for occurring sub-synchronous oscillation is also difficult to predict.Current sub-synchronous oscillation braking measure typically passes through
Control to SVG or SVC produces the electric current of suppression sub-synchronous oscillation, and is injected into system to eliminate sub-synchronous oscillation, but this
A little braking measures generally require the equipment and complicated control process of costliness, while there is also control strategy mismatch, response
The problems such as slow and effect is not notable, it is difficult to fundamentally solve the sub-synchronous oscillation of direct drive wind power.
The content of the invention
It is an object of the invention to optimized for above-mentioned the problems of the prior art there is provided one kind based on net side control loop
Directly driven wind-powered sub-synchronous oscillation suppression method, do not influence it is normal it is grid-connected on the basis of, suppress the work(of all subsynchronous frequency ranges
Rate vibrates.
To achieve these goals, the technical solution adopted by the present invention comprises the following steps：
Step 1: in direct-drive type blower fan net side control loop, inverter control loop current is obtained in d axles by measuring
Component igdAndCorrection igd′；
Step 2: to the correction electric current i of control loopgd' be filtered, obtain electric current igd' in subsynchronous component
igdsub；
Step 3: the time delay caused according to filtering, obtains feeding back to the voltage signal of outer voltage after phase compensation
Usub；
Step 4: building PI controllers, the voltage signal U of outer voltage will be fed back tosubWith DC capacitor voltage Udc, it is straight
Flow reference voltage UrefCollectively as the input quantity of outer shroud PI controllers, sub-synchronous oscillation suppression is carried out.
Described direct-drive type blower fan is permanent magnet direct-driven blower fan.
Filtering in the step 2 uses second order Butterworth bandpass filter.
The cut-off frequency of the second order Butterworth bandpass filter is 10Hz~40Hz.
First by the electric current subsynchronous component i of acquisition in described step threegdsubK times is enlarged into, ki is obtainedgdsub；Institute
The numerical values recited for stating k is determined according to the content of subsynchronous component.The value of the k is 5.
According to formula in the step 3Carry out phase compensation, T1And T2Numerical value by wave filter time delayses
It is determined that.
The T1Value be 0.01, T2Value be 0.001.
Compared with prior art, the present invention has following beneficial effect：By to the d in net side inverter control loop
Shaft current correction is filtered processing, and the subsynchronous component in d shaft current corrections is obtained first, then by this subsynchronous point
Amount carries out phase compensation, finally feedovers to outer voltage, with direct voltage reference value and DC voltage actual value collectively as d axles
Outer shroud input signal, after being adjusted through PI formed d shaft currents reference value, with regard to the subsynchronous component in controlling unit can be eliminated,
The suppression to sub-synchronous oscillation is realized by the optimization of net side control loop.Suppression of the present invention to sub-synchronous oscillation need not
Extra equipment and the controlling unit of complexity, operating process are simple and economical.Meanwhile, the present invention can be to each subsynchronous frequency
The vibration of section is suppressed, widely applicable, while not interfering with the normal operation of direct-drive wind power grid-connection.
Brief description of the drawings
The simulation model figure of Fig. 1 direct drive wind power one machine infinity bus systems；
Fig. 2 net side control loops of the present invention suppress sub-synchronous oscillation schematic diagram；
The current waveform figure of Fig. 3 direct-drive wind power grid-connections point；
Current spectrum analysis chart before Fig. 4 braking measure effects of the present invention；
Current spectrum analysis chart after Fig. 5 braking measure effects of the present invention；
The active power oscillogram of Fig. 6 blower fans output.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, Simulation Model is one machine infinity bus system, i.e., one 1.6MW/0.69kV direct-drive type blower fan leads to
Cross the Infinite bus system that 0.69/35kV casees become access 35kV.Detailed simulation parameter is as shown in the table.
Table 1：The parameter of analogue system
| Simulation system parameters | Numerical value |
| Blower fan rated capacity/MW | 1.6 |
| Blower fan rated voltage/kV | 0.69 |
| Filter inductance/H | 0.001 |
| Converter switches frequency/kHz | 5 |
| Connection electrical resistance/Ω | 3.57 |
| Couple inductance/H | 0.033 |
| Transformer short-circuit voltage percentage | 6% |
| Transformer rated capacity/MVA | 2 |
Referring to Fig. 2, under certain operating mode, sub-synchronous oscillation, subsynchronous frequency are there occurs in direct-drive wind power grid-connection operation
For 13.0Hz.Therefore, the inverter current correction under dq coordinate systems in net side control loop exists mutual with subsynchronous frequency
The 37.0Hz of benefit subsynchronous component.Therefore it is entered by the Butterworth bandpass filter (cut-off frequency 10-40Hz) of second order
Row filtering, obtains net side inverter current correction igd' in subsynchronous component igdsub, by the subsynchronous component of the electric current
igdsub5 times are enlarged into, then phase compensation is carried out to subsynchronous component and component of voltage, wherein T is converted into1=0.01, T2=
0.001, finally by the subsynchronous component of voltage U after processingsubDeliver in the comparing element of outer voltage and to be shaken with realizing to subsynchronous
The suppression swung.
In order to illustrate the accuracy of the inventive method, electromagnetism is carried out for the Infinite bus power system model of direct-drive wind power grid-connection
The time-domain-simulation of transient state, hyposynchronous braking measure is put into t=2s.Simulation result shows, within the 0-2s periods, straight to drive
Formula wind-powered electricity generation there occurs the sub-synchronous oscillation that frequency is 13.0Hz, and the sub-synchronous oscillation of grid entry point electric current disappears after 2s, and containing only
Have power frequency component, grid entry point current waveform as shown in figure 3, current spectrum analysis before and after braking measure effect respectively such as Fig. 4 and
Shown in Fig. 5.The active power of blower fan output, there is also larger 37.0Hz frequency component, is put into 0-2s in braking measure
Vibration is wholly absent afterwards, stable output power, and the active power waveform of blower fan output is as shown in Figure 6.
The inventive method only needs to be improved the net side control loop of direct-drive type blower fan, it becomes possible to realize to subsynchronous
The suppression function of vibration.Meanwhile, for information such as different sub-synchronous oscillation frequency, amplitudes, it is only necessary to reference to field working conditions and
Demand, adjusts the multiple of amplifying element and the time constant of compensation tache, just can reach the purpose for suppressing sub-synchronous oscillation.
Above example is only the simulation embodiment that the present invention recommends, and its structure is not limited in any form with parameter
The system present invention.Art personnel made based on any modification in content of the invention principle, change and improve etc., will not shadow
The inventive nature content is rung, all should be in the scope of the present invention.
Claims (8)
1. a kind of directly driven wind-powered sub-synchronous oscillation suppression method optimized based on net side control loop, it is characterised in that including：
Step 1: in direct-drive type blower fan net side control loop, by measuring point for obtaining inverter control loop current in d axles
Measure igdAndCorrection igd′；
Step 2: to the correction electric current i of control loopgd' be filtered, obtain electric current igd' in subsynchronous component igdsub；
Step 3: the time delay caused according to filtering, obtains feeding back to the voltage signal U of outer voltage after phase compensationsub；
Step 4: building PI controllers, the voltage signal U of outer voltage will be fed back tosubWith DC capacitor voltage Udc, direct current ginseng
Examine voltage UrefCollectively as the input quantity of outer shroud PI controllers, sub-synchronous oscillation suppression is carried out.
2. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 1 based on net side control loop, it is special
Levy and be：Described direct-drive type blower fan is permanent magnet direct-driven blower fan.
3. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 1 based on net side control loop, it is special
Levy and be：Filtering in the step 2 uses second order Butterworth bandpass filter.
4. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 3 based on net side control loop, it is special
Levy and be：The cut-off frequency of the second order Butterworth bandpass filter is 10Hz~40Hz.
5. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 1 based on net side control loop, it is special
Levy and be：First by the electric current subsynchronous component i of acquisition in described step threegdsubK times is enlarged into, ki is obtainedgdsub；Institute
The numerical values recited for stating k is determined according to the content of subsynchronous component.
6. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 5 based on net side control loop, it is special
Levy and be：The value of the k is 5.
7. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 1 based on net side control loop, it is special
Levy and be：According to formula in the step 3Carry out phase compensation, T1And T2Numerical value it is true by the time delayses of wave filter
It is fixed.
8. the directly driven wind-powered sub-synchronous oscillation suppression method optimized according to claim 7 based on net side control loop, it is special
Levy and be：The T1Value be 0.01, T2Value be 0.001.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110739704A (en) * | 2019-10-28 | 2020-01-31 | 贵州电网有限责任公司 | control method for restraining low-frequency oscillation operation risk of power distribution network |
| CN111262244A (en) * | 2020-03-06 | 2020-06-09 | 西南交通大学 | High-speed rail low-frequency oscillation suppression method based on self-feedback correction device model control |
| CN112186758A (en) * | 2020-09-28 | 2021-01-05 | 西安热工研究院有限公司 | Sub-synchronous oscillation suppression method of direct-drive wind turbine generator capable of adaptively capturing frequency points |
| US20220021211A1 (en) * | 2020-07-15 | 2022-01-20 | North China Electric Power University | Method, system and storage medium for suppressing sub/super-synchronous oscillation for direct-drive wind turbine based on energy compensation |
| CN114123234A (en) * | 2021-09-30 | 2022-03-01 | 国网电力科学研究院有限公司 | Subsynchronous oscillation suppression method and system based on active oscillation current blocking and storage medium |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739704A (en) * | 2019-10-28 | 2020-01-31 | 贵州电网有限责任公司 | control method for restraining low-frequency oscillation operation risk of power distribution network |
| CN111262244A (en) * | 2020-03-06 | 2020-06-09 | 西南交通大学 | High-speed rail low-frequency oscillation suppression method based on self-feedback correction device model control |
| CN111262244B (en) * | 2020-03-06 | 2022-07-01 | 西南交通大学 | High-speed rail low-frequency oscillation suppression method based on self-feedback correction device model control |
| US20220021211A1 (en) * | 2020-07-15 | 2022-01-20 | North China Electric Power University | Method, system and storage medium for suppressing sub/super-synchronous oscillation for direct-drive wind turbine based on energy compensation |
| CN112186758A (en) * | 2020-09-28 | 2021-01-05 | 西安热工研究院有限公司 | Sub-synchronous oscillation suppression method of direct-drive wind turbine generator capable of adaptively capturing frequency points |
| CN112186758B (en) * | 2020-09-28 | 2022-12-09 | 西安热工研究院有限公司 | Sub-synchronous oscillation suppression method of direct-drive wind turbine generator capable of adaptively capturing frequency points |
| CN114123234A (en) * | 2021-09-30 | 2022-03-01 | 国网电力科学研究院有限公司 | Subsynchronous oscillation suppression method and system based on active oscillation current blocking and storage medium |
| CN114123234B (en) * | 2021-09-30 | 2024-06-11 | 国网电力科学研究院有限公司 | Subsynchronous oscillation suppression method, system and storage medium based on active oscillation current blocking |
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