CN108493958A - The broadband oscillation of generation of electricity by new energy station inhibits equipment and its control method - Google Patents
The broadband oscillation of generation of electricity by new energy station inhibits equipment and its control method Download PDFInfo
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- CN108493958A CN108493958A CN201810250954.6A CN201810250954A CN108493958A CN 108493958 A CN108493958 A CN 108493958A CN 201810250954 A CN201810250954 A CN 201810250954A CN 108493958 A CN108493958 A CN 108493958A
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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
Abstract
It is vibrated the invention discloses a kind of generation of electricity by new energy station broadband and inhibits equipment and its control method, which includes mainly analysis of Impedance Characteristic unit, three-phase cascade multi-level converter and 10kV/35kV coupling transformers.Analysis of Impedance Characteristic unit is used to analyze the impedance operator of generation of electricity by new energy station and power grid, it is diagnosed to be generation of electricity by new energy station by impedance analysis method and is easy the impedance frequency range that the by of being interacted with power grid is vibrated, and obtains the desired output impedance of three-phase cascade multi-level converter.Three-phase cascade multi-level converter is connected to by 10kV/35kV coupling transformers on the 35kV busbares of generation of electricity by new energy station, and DC voltage outer shroud PI controls, submodule Pressure and Control and the quasi- PR controls of current inner loop are used.The stability of generation of electricity by new energy station can be improved in the present invention, and reduction electric system abandons wind and abandons light rate, promotes the consumption of new energy.
Description
Technical field
The present invention relates to the small disturbance stability control field in generation of electricity by new energy, especially a kind of generation of electricity by new energy station is wide
Frequency band oscillation inhibits equipment and its control method.
Background technology
As the environmental problems such as the increasingly depleted of fossil energy and global warming are aggravated, the development and utilization of new energy
As it is sought that source structure adjusts, realizes the optimal selection of sustainable development.In analysis generation of electricity by new energy station access electricity
When net, stabilization that the impedance operator of power grid equips the power electronics such as wind-force, photovoltaic combining inverter in generation of electricity by new energy station
Operation and control have an important influence on.Ideally, power grid should show as ideal voltage source, and generation of electricity by new energy equipment is answered
Control is ideal current source, to avoid any impedance coupling interaction problem.However in practice, the new energy hair of China's large capacity
The mostly foundation of electric field station is from far-off regions in desert, grassland and mountain area etc., and farther out apart from major network, the light current net that high impedance is presented in power grid is special
Sign.Coupling interaction is occurred for the impedance for leading to light current net and the impedance of generation of electricity by new energy equipment by this, influences grid-connected power generation system
Stable operation, the serious extensive development for restricting new energy and application.
The small disturbance stability sex chromosome mosaicism of research generation of electricity by new energy station access network system has important practical significance.Mesh
Before, when power grid generation broadband oscillation problem is accessed in generation of electricity by new energy station, most common way is exactly to cut away new energy in engineering
Source power generating equipment ensures the safety of electric system.But this method cannot be solved the problems, such as substantially, can cause the big of new energy
Amount waste, and further increasing with generation of electricity by new energy installed capacity, this method cannot be applicable in, and also limit new energy
The permeability of source power generation improves.In addition it is exactly to change new energy electricity in generation of electricity by new energy station to also have a kind of common braking measure
The output impedance of new energy electric power electronics is reconstructed in the control method of power electronics so that generation of electricity by new energy field
Stand access power grid equivalent loop gain meet Nyquist stability criterion, to ensure that the safety and stability of system is surely run.
For theoretically, this method is quite effective.But in Practical Project practice, since generation of electricity by new energy has been rapidly developed,
Has new energy electric power electronics installed capacity enormous amount, and type is various, if carried out to every power electronics equipment
Control transformation, then cost is huge and difficulty is very big.Therefore, existing to access network system for generation of electricity by new energy station
Small disturbed stability way to solve the problem Shortcomings, it is difficult to solve actual oscillation problem, there is an urgent need for break through a kind of broadband
It is excellent to vibrate inhibition, the simple generation of electricity by new energy station broadband oscillation suppression method of engineering practice.
Invention content
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, it is wide to provide a kind of generation of electricity by new energy station
Frequency band oscillation inhibits equipment and its control method to be made up in new energy to meet the requirement of generation of electricity by new energy station stable operation
Power generation station broadband vibrates special plug-in equipment and the blank in control method.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of generation of electricity by new energy station broadband
Oscillation inhibits equipment, including analysis of Impedance Characteristic unit；The analysis of Impedance Characteristic unit is converted with three-phase cascading multiple electrical level
Device connects；The three-phase cascade multi-level converter respectively passes through the original of a filter module and coupling transformer per phase output terminal
Side connects, and the secondary side of the coupling transformer is connected on the 35kV busbares of generation of electricity by new energy station；How electric the three-phase cascade connection type is
The flat each phase of converter includes n cascade single-phase H bridges DC/AC converters.
The analysis of Impedance Characteristic unit uses impedance analysis method, special according to the impedance of generation of electricity by new energy station and power grid
Property obtains the desired output impedance of three-phase cascade multi-level converter
In the present invention, n=15~40.
The coupling transformer is the Y-Y type coupling transformers of 10kV/35kV.
Correspondingly, vibrating the controlling party for inhibiting equipment the present invention also provides a kind of above-mentioned generation of electricity by new energy station broadband
Method comprising following steps：
1) in the starting point in each sampling period, to the exchange side three-phase voltage u of three-phase cascade multi-level convertera、
ub、ucWith three-phase output current iLa、iLb、iLc, and each single-phase H bridges DC/AC of three-phase cascade multi-level converter is converted
The DC voltage u of deviceAx、uBx、uCxIt is sampled respectively, wherein subscript A, B and C indicates A phases, B phases and C phases, subscript x respectively
Indicate the serial number of single-phase H bridges DC/AC converters, x=1 ... n, n are the quantity of the single-phase H bridges DC/AC converters of each phase；
2) the DC voltage average value u of each single-phase H bridges DC/AC converters of each phase is calculatedavga、uavgb、uavgc, will be straight
Flow side voltage command signalRespectively with uavga、uavgb、uavgcIt is poor to make, and gained difference is sent to PI controllers, obtains three
The watt current amplitude of phase instructs
3) the watt current amplitude of three-phase is instructedCorresponding and sin θ respectivelyPLL、sin(θPLL-2π/3)、
sin(θPLL+ 2 π/3) it is multiplied, obtain the watt current instantaneous value instruction of three-phaseWherein θPLLFor voltage uaPhase
Position；
4) by voltage ua、ub、ucRespectively divided byObtain the current instantaneous value instruction of three-phase virtual impedance branchIt willRespectively and Addition obtains the three of three-phase cascade multi-level converter
Phase output current instructs
5) three-phase output current is instructedRespectively with three-phase output current iLa、iLb、iLcIt is poor to make, and by institute
It obtains difference and is sent to quasi- PR controllers, obtain the modulation wave signal u of three-phasera、urb、urc；
6) by the DC voltage average value u of each single-phase H bridges DC/AC converters of three-phaseavga、uavgb、uavgcRespectively with three
The DC voltage u of each single-phase H bridges DC/AC converters of phaseAx、uBx、uCxIt is poor to make, and gained difference is multiplied by ratio system respectively
Product, is then multiplied by three-phase output current i by number K respectivelyLa、iLb、iLcObtain each single-phase H bridges DC/AC converter direct currents of three-phase
The modulation wave signal Δ u that side voltage is divided equallyAx、ΔuBx、ΔuCx；
7) by ura、urb、urcWith Δ uAx、ΔuBx、ΔuCxCorresponding respectively to be added, each single-phase H bridges DC/AC for obtaining three-phase becomes
The modulation wave signal u of parallel operationrax、urbx、urcx；
8) to urax、urbx、urcxPhase-shifting carrier wave Multilevel modulation is carried out with triangular carrier, obtains each single-phase H bridges of three-phase
The pwm signal of switching tube in DC/AC converters controls opening and turning off for switching tube.
In step 2), the transmission function of PI controllers is：Wherein Kpi_pFor the ratio of PI controllers
Example coefficient, Kpi_iFor the integral coefficient of PI controllers, Kpi_pTake 0.01~50, Kpi_iTake 0.1~200.
In step 5), the transmission function of quasi- PR controllers is：Wherein KpSubject to PR
The proportionality coefficient of control, KiSubject to PR control integral coefficient, ωcFor resonant bandwidth, ω0For electrical network angular frequency, KpTake 0.1~
10, KiTake 1~200, ωcTake 0.1~1000.
Compared with prior art, the advantageous effect of present invention is that：Present invention accomplishes generation of electricity by new energy station is steady
Surely the requirement of light current net is accessed, it is simple and practical, it makes up and vibrates special plug-in equipment and control in generation of electricity by new energy station broadband
Blank in method；The equipment of the present invention can actively adjust the impedance operator of entire generation of electricity by new energy station so that new energy is sent out
The equivalent loop gain of electric field station access power grid meets Nyquist stability criterion, to inhibit the width of generation of electricity by new energy station
Frequency band oscillation problem.The stability of generation of electricity by new energy station can be improved in the present invention, and reduction electric system abandons wind and abandons light rate, promotes
The consumption of new energy.
Description of the drawings
Fig. 1 is that broadband oscillation in one embodiment of the invention generation of electricity by new energy station inhibits equipment special system construction drawing；
Fig. 2 is the control block diagram that broadband oscillation in one embodiment of the invention generation of electricity by new energy station inhibits equipment special；
Fig. 3 is that the broadband oscillation of new energy station input generation of electricity by new energy station inhibits the grid-connected current after equipment special imitative
True oscillogram.
Fig. 4 is that the broadband oscillation of new energy station input generation of electricity by new energy station inhibits the grid-connected voltage after equipment special imitative
True oscillogram.
Specific implementation mode
As shown in Figure 1, broadband oscillation in generation of electricity by new energy of embodiment of the present invention station inhibits equipment special system construction drawing
Including analysis of Impedance Characteristic unit, three-phase cascade multi-level converter and 10kV/35kV coupling transformers.The impedance operator
Analytic unit uses impedance analysis method, how electric obtains three-phase cascade connection type according to the impedance operator of generation of electricity by new energy station and power grid
The desired output impedance of flat converterEach phase of the three-phase cascade multi-level converter includes n cascade lists
Phase H bridge DC/AC converters；SMA1、SMA2…SMAnThe 1st of expression three-phase cascade multi-level converter A phases is to n-th respectively
Single-phase H bridges DC/AC converters；SMB1、SMB2…SMBnThe 1st to n-th of three-phase cascade multi-level converter B phases is indicated respectively
A single-phase H bridges DC/AC converters；SMC1、SMC2…SMCnThe 1st of three-phase cascade multi-level converter C phases is indicated respectively to arrive
N-th of single-phase H bridges DC/AC converter.The topologies of the single-phase H bridges DC/AC converters mainly have 4 IGBT power tubes and
DC bus capacitor is constituted.Each phase output of three-phase cascade multi-level converter meets inductor filter module Lf.Inductor filter mould
Block LfBeing vibrated generation of electricity by new energy station broadband by 10kV/35kV coupling transformers inhibits equipment special to be linked into 35kV mothers
On line.Generation of electricity by new energy station is either wind power plant can also be photovoltaic plant, or other new energy station.ua、
ub、ucFor the exchange side three-phase voltage of three-phase cascade multi-level converter；iLa、iLb、iLcIt is converted for three-phase cascading multiple electrical level
The exchange side three-phase output current of device.
Fig. 2 is the control block diagram that broadband oscillation in generation of electricity by new energy station inhibits equipment special, and generation of electricity by new energy station is wide
Frequency band oscillation inhibits the rate-determining steps of equipment special as follows：
1) in the starting point in each sampling period, to the exchange side three-phase voltage u of three-phase cascade multi-level convertera、
ub、ucWith three-phase output current iLa、iLb、iLc, and each single-phase H bridges DC/AC converters to three-phase DC voltage uAx、
uBx、uCxIt is sampled respectively, wherein subscript A, B and C indicates that A phases, B phases and C phases, subscript x indicate that single-phase H bridges DC/AC becomes respectively
The serial number of parallel operation, x=1 ... n, n are the quantity of the single-phase H bridges DC/AC converters of each phase；
2) the DC voltage average value u of each single-phase H bridges DC/AC converters of each phase is calculatedavga、uavgb、uavgc, will be straight
Flow side voltage command signalWith uavga、uavgb、uavgcIt is poor to make, and gained difference is sent to PI controllers, obtains three-phase
Watt current amplitude instructs
3) the watt current amplitude of three-phase is instructedRespectively with sin θPLL、sin(θPLL-2π/3)、sin
(θPLL+ 2 π/3) being multiplied obtains the watt current instantaneous value instruction of three-phaseWherein θPLLFor voltage uaPhase；
4) by voltage ua、ub、ucRespectively divided byObtain the current instantaneous value instruction of three-phase virtual impedance branchIt willRespectively andAddition obtains three-phase cascade multi-level converter
Three-phase output current instruction
5) three-phase output current is instructedRespectively with three-phase output current iLa、iLb、iLcIt is poor to make, and by institute
It obtains difference and is sent to quasi- PR controllers, obtain the modulation wave signal u of three-phasera、urb、urc；
6) by the DC voltage average value u of each single-phase H bridges DC/AC converters of three-phaseavga、uavgb、uavgcRespectively with three
The DC voltage u of each single-phase H bridges DC/AC converters of phaseAx、uBx、uCxIt is poor to make, and gained difference is multiplied by ratio system respectively
Product, is then multiplied by three-phase output current i by number K respectivelyLa、iLb、iLcObtain each single-phase H bridges DC/AC converter direct currents of three-phase
The modulation wave signal Δ u that side voltage is divided equallyAx、ΔuBx、ΔuCx；
7) by modulation wave signal ura、urb、urcWith modulation wave signal Δ uAx、ΔuBx、ΔuCxIt is separately summed to obtain three-phase
The modulation wave signal u of each single-phase H bridges DC/AC convertersrax、urbx、urcx；
8) to urax、urbx、urcxPhase-shifting carrier wave Multilevel modulation is carried out with triangular carrier, obtains each single-phase H bridges of three-phase
The pwm signal of switching tube in DC/AC converters controls opening and turning off for switching tube.
1, in the step 2) of the control method, the transmission function of PI controls is：Wherein Kpi_p
For the proportionality coefficient of PI controllers, Kpi_pTake 0.01~50, Kpi_iFor the integral coefficient of PI controllers, Kpi_iTake 0.1~200.
2, in the step 5) of the control method, the transmission function of quasi- PR controls is：
Wherein KpSubject to PR control proportionality coefficient, KpTake 0.1~10, KiSubject to PR control integral coefficient, KiTake 1~200, ωcFor
Resonant bandwidth, ωcTake 0.1~1000, ω0For electrical network angular frequency.
Fig. 3 and Fig. 4 is respectively after the broadband oscillation of new energy station input generation of electricity by new energy station inhibits equipment special
Grid-connected current simulation waveform and grid-connected voltage simulation waveform.In figure, iga、igb、igcFor generation of electricity by new energy station three-phase simultaneously
Net electric current；uga、ugb、ugcFor the three-phase grid voltage of generation of electricity by new energy station；0.6 second moment generation of electricity by new energy station broadband
Oscillation inhibits equipment special to put into operation.It can be seen that the broadband oscillation suppression of new energy station input generation of electricity by new energy station
After equipment special processed, oscillatory occurences can be solved, it was demonstrated that this is reorganized and outfit and its validity of control method.
Claims (9)
1. a kind of broadband oscillation in generation of electricity by new energy station inhibits equipment, which is characterized in that including analysis of Impedance Characteristic unit；Institute
Analysis of Impedance Characteristic unit is stated to connect with three-phase cascade multi-level converter；The three-phase cascade multi-level converter is per phase
Output end is respectively connected by the primary side of a filter module and coupling transformer, and the secondary side of the coupling transformer is connected to new energy
It generates electricity on the 35kV busbares of station；The each phase of three-phase cascade multi-level converter includes n cascade single-phase H bridges DC/
AC converters.
2. broadband oscillation in generation of electricity by new energy station according to claim 1 inhibits equipment, which is characterized in that the impedance
Specificity analysis unit uses impedance analysis method, and three-phase cascade connection type is obtained according to the impedance operator of generation of electricity by new energy station and power grid
The desired output impedance of multi-level converter
3. broadband oscillation in generation of electricity by new energy station according to claim 1 inhibits equipment, which is characterized in that n=15~
40。
4. broadband oscillation in generation of electricity by new energy station according to claim 1 inhibits equipment, which is characterized in that the coupling
Transformer is the Y-Y type coupling transformers of 10kV/35kV.
5. the generation of electricity by new energy station broadband oscillation described in a kind of one of Claims 1 to 4 inhibits the control method of equipment,
It is characterized in that, includes the following steps：
1) in the starting point in each sampling period, to the exchange side three-phase voltage u of three-phase cascade multi-level convertera、ub、uc
With three-phase output current iLa、iLb、iLc, and to each single-phase H bridges DC/AC converters of three-phase cascade multi-level converter
DC voltage uAx、uBx、uCxIt is sampled respectively, wherein subscript A, B and C indicates that A phases, B phases and C phases, subscript x indicate respectively
The serial number of single-phase H bridges DC/AC converters, x=1 ... n, n are the quantity of the single-phase H bridges DC/AC converters of each phase；
2) the DC voltage average value u of each single-phase H bridges DC/AC converters of each phase is calculatedavga、uavgb、uavgc, by DC side
Voltage command signalRespectively with uavga、uavgb、uavgcIt is poor to make, and gained difference is sent to PI controllers, obtains three-phase
Watt current amplitude instructs
3) the watt current amplitude of three-phase is instructedCorresponding and sin θ respectivelyPLL、sin(θPLL-2π/3)、sin
(θPLL+ 2 π/3) it is multiplied, obtain the watt current instantaneous value instruction of three-phaseWherein θPLLFor voltage uaPhase；
4) by voltage ua、ub、ucRespectively divided byObtain the current instantaneous value instruction of three-phase virtual impedance branchIt willRespectively and Addition obtains the three of three-phase cascade multi-level converter
Phase output current instructs
5) three-phase output current is instructedRespectively with three-phase output current iLa、iLb、iLcIt is poor to make, and by gained difference
Quasi- PR controllers are sent to, the modulation wave signal u of three-phase is obtainedra、urb、urc；
6) by the DC voltage average value u of each single-phase H bridges DC/AC converters of three-phaseavga、uavgb、uavgcRespectively with three-phase
The DC voltage u of each single-phase H bridges DC/AC convertersAx、uBx、uCxIt is poor to make, and gained difference is multiplied by Proportional coefficient K respectively,
Then product is multiplied by three-phase output current i respectivelyLa、iLb、iLcObtain each single-phase H bridges DC/AC converters DC side electricity of three-phase
The modulation wave signal Δ u that pressure is divided equallyAx、ΔuBx、ΔuCx；
7) by ura、urb、urcWith Δ uAx、ΔuBx、ΔuCxIt is corresponding respectively to be added, obtain each single-phase H bridges DC/AC converters of three-phase
Modulation wave signal urax、urbx、urcx；
8) to urax、urbx、urcxPhase-shifting carrier wave Multilevel modulation is carried out with triangular carrier, obtains each single-phase H bridges DC/AC of three-phase
The pwm signal of switching tube in converter controls opening and turning off for switching tube.
6. according to the method described in claim 5, it is characterized in that, in step 2), the transmission function of PI controllers is：Wherein Kpi_pFor the proportionality coefficient of PI controllers, Kpi_iFor the integral coefficient of PI controllers.
7. according to the method described in claim 6, it is characterized in that, Kpi_pTake 0.01~50, Kpi_iTake 0.1~200.
8. according to the method described in claim 5, it is characterized in that, in step 5), the transmission function of quasi- PR controllers is：Wherein KpSubject to PR control proportionality coefficient, KiSubject to PR control integral coefficient, ωc
For resonant bandwidth, ω0For electrical network angular frequency.
9. according to the method described in claim 8, it is characterized in that, KpTake 0.1~10, KiTake 1~200, ωcTake 0.1~
1000。
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| CN110957759A (en) * | 2019-11-20 | 2020-04-03 | 合肥工业大学 | Control method of cascade impedance adapter for stabilizing grid-connected inverter system |
| CN112436537A (en) * | 2020-11-11 | 2021-03-02 | 许继电气股份有限公司 | Broadband oscillation suppression method for flexible direct current sending system of offshore wind farm |
| CN112736982A (en) * | 2021-03-30 | 2021-04-30 | 湖南大学 | Broadband oscillation suppression method and system for new energy grid-connected converter |
| CN113497455A (en) * | 2020-03-19 | 2021-10-12 | 新疆金风科技股份有限公司 | Method and device for regulating and controlling converter of wind turbine generator in wind power plant |
| WO2023061448A1 (en) * | 2021-10-13 | 2023-04-20 | 南京南瑞继保电气有限公司 | Method and apparatus for suppressing broadband oscillation of converter, and electronic device and storage medium |
| CN117096894A (en) * | 2023-10-18 | 2023-11-21 | 国网湖北省电力有限公司 | Broadband oscillation suppression control method, system and medium |
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| CN112736982B (en) * | 2021-03-30 | 2021-06-25 | 湖南大学 | Broadband oscillation suppression method and system for new energy grid-connected converter |
| WO2023061448A1 (en) * | 2021-10-13 | 2023-04-20 | 南京南瑞继保电气有限公司 | Method and apparatus for suppressing broadband oscillation of converter, and electronic device and storage medium |
| CN117096894A (en) * | 2023-10-18 | 2023-11-21 | 国网湖北省电力有限公司 | Broadband oscillation suppression control method, system and medium |
| CN117096894B (en) * | 2023-10-18 | 2024-01-02 | 国网湖北省电力有限公司 | Broadband oscillation suppression control method, system and medium |
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| CN108493958B (en) | 2021-07-02 |
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