CN107508311A - The method and system of the lifting operational efficiency of parallel connection type wind electric converter - Google Patents
The method and system of the lifting operational efficiency of parallel connection type wind electric converter Download PDFInfo
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- CN107508311A CN107508311A CN201710548296.4A CN201710548296A CN107508311A CN 107508311 A CN107508311 A CN 107508311A CN 201710548296 A CN201710548296 A CN 201710548296A CN 107508311 A CN107508311 A CN 107508311A
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- 230000005611 electricity Effects 0.000 claims description 5
- 238000009790 rate-determining step (RDS) Methods 0.000 claims description 4
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a kind of method level system of the lifting operational efficiency of parallel connection type wind electric converter, including：According to the efficiency value of each operating point of converter in parallel connection type wind electric converter, using NUMERICAL MATCH METHOD FOR, the efficiency curve and efficiency function of parallel connection type wind electric converter are obtained；Pass through the optimum efficiency and optimal power allocation ratio under each operating point of optimization object function off-line calculation parallel connection type wind electric converter；Look-up table is made in the optimal power allocation ratio that off-line calculation is obtained, and sets the power-division ratios under each operating point of parallel connection type wind electric converter.By optimizing the power distribution between each parallel connection converter, the whole efficiency lifting of parallel connection type current transformer is realized.This method only needs to modify to the control strategy of parallel connection type current transformer, and without increasing other equipment, and dynamic response is fast, and control flexibility ratio is high.
Description
Technical field
The present invention relates to electroporation field, in particular it relates to the side of the lifting operational efficiency of parallel connection type wind electric converter
Method and system.
Background technology
At present, Renewable Energy Development is rapid, especially wind-powered electricity generation and photovoltaic.With increasingly mature, the wind-powered electricity generation of wind power technology
Worldwide extensive development.With continually developing for land wind power resources, wind-powered electricity generation starts to sea to develop from land, sea
Upper Wind turbines high capacity is development trend.High reliability is the requirement most basic to offshore wind farm current transformer, multiple transformer
The mode of parallel running can greatly improve the reliability of wind electric converter, so offshore wind farm current transformer typically uses different transform
Device mode in parallel is realized.
Under traditional control method, parallel converter system uses power-sharing mode operation more, and this pattern is applied to negative
Carry the application scenario of power stability.For wind electric converter, random, the wave characteristic of wind energy cause the load on converter
Power swing is very big, and its average load power is less than the 50% of rated power.The operational efficiency of current transformer depends on it and loads work(
Rate, under different operating point, its efficiency variance is larger, especially low load operating point, and its efficiency is more much lower than rated efficiency.Power is equal
Sub-control system is not suitable for parallel connection type wind electric converter system, it is necessary to propose new operation control strategy, lifts its overall operation efficiency.
At present, the research both at home and abroad for lifting current transformer efficiency is concentrated in the lifting of single inverter efficiency, mainly
Have using New Type Power Devices, optimization converter topology, optimization modulation system and control algolithm etc..For in parallel under fluctuating power
The method for improving of type converter system operational efficiency is there is not yet report.Such as Publication No. CN105870957A patent of invention is public
A kind of dynamic direct current bus voltage control method for improving back-to-back converter efficiency is opened, the invention passes through dynamic regulation direct current
Busbar voltage reference value, make current transformer is adaptive to be operated in minimum direct current busbar voltage, so as to reduce power electronic devices
Electric stress simultaneously improves current transformer efficiency.This method is only applicable to the improved efficiency of single current transformer, does not apply to and is imitated with parallel system
The lifting of rate, and dynamic regulation bus set-point, voltage pulsation on DC capacitor can be caused larger, increase electric capacity stress, can drop
The reliability of low electric capacity, system.
The content of the invention
For in the prior art the defects of, it is an object of the invention to provide a kind of parallel connection type wind electric converter lifting operation
The method of efficiency.
The method that lifting operational efficiency is combined according to the adaptive optimization of parallel connection type wind electric converter provided by the invention, bag
Include：
Numerical fitting step：According to the efficiency value of each operating point of converter in parallel connection type wind electric converter, intended using numerical value
Conjunction method, obtain the efficiency curve and efficiency function of parallel connection type wind electric converter；
Optimization object function step：By under each operating point of optimization object function off-line calculation parallel connection type wind electric converter
Optimum efficiency and optimal power allocation ratio；
Look-up table making step：Look-up table is made in the optimal power allocation ratio that off-line calculation is obtained, and sets parallel connection type wind
Power-division ratios under each operating point of electric converter.
Preferably, the optimization object function step passes through optimization object function off-line calculation with 1 ‰ power resolution
Optimum efficiency and optimal power allocation ratio under each operating point of parallel connection type wind electric converter.
Preferably, in addition to：
Adaptive optimization combines rate-determining steps：The power instruction of each converter under any operating mode is obtained by look-up table,
Realize adaptive optimization combination control.
Preferably, optimization object function is：
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it is that input power is PINWhen parallel system gross efficiency, PIN,iFor converter
I input power, i=1,2...n.
Preferably, the constraints of optimization object function is：
PRFor the rated power of single inverter.
According to a kind of system of the lifting operational efficiency of parallel connection type wind electric converter provided by the invention, including：
Numerical fitting module：According to the efficiency value of each operating point of converter in parallel connection type wind electric converter, intended using numerical value
Conjunction method, obtain the efficiency curve and efficiency function of parallel connection type wind electric converter；
Optimization object function module：By under each operating point of optimization object function off-line calculation parallel connection type wind electric converter
Optimum efficiency and optimal power allocation ratio；
Look-up table makes module：Look-up table is made in the optimal power allocation ratio that off-line calculation is obtained, and sets parallel connection type wind
Power-division ratios under each operating point of electric converter.
Preferably, the optimization object function step passes through optimization object function off-line calculation with 1 ‰ power resolution
Optimum efficiency and optimal power allocation ratio under each operating point of parallel connection type wind electric converter.
Preferably, in addition to：
Adaptive optimization combines rate-determining steps：The power instruction of each converter under any operating mode is obtained by look-up table,
Realize adaptive optimization combination control.
Preferably, optimization object function is：
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it is that input power is PINWhen parallel system gross efficiency, PIN,iFor converter
I input power, i=1,2...n.
Preferably, the constraints of optimization object function is：
PRFor the rated power of single inverter.
Compared with prior art, the present invention has following beneficial effect：
1st, the optimum organization for realizing each converter by the control technology of current transformer in itself controls, it is not necessary to increases any auxiliary
Help equipment；
2nd, the load adaptive optimization of each parallel connection converter can be realized；
3rd, fast response time.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the structural representation of parallel converters system；
Fig. 2 is the power conversion schematic diagram of parallel converters；
Fig. 3 is the flow chart of the method for the lifting operational efficiency of parallel connection type wind electric converter；
Fig. 4 is the efficiency curve diagram of single current transformer；
Fig. 5 is the algorithm flow chart of optimization object function；
Fig. 6 is the optimization efficiency curve map of two converter parallel systems；
Fig. 7 is the power distribution figure of two converter parallel system optimum organization；
Fig. 8 is power-sharing, the static efficiency curve map of the lower parallel system of adaptive optimization combination control；
Fig. 9 is power-sharing, the static power distribution diagram of lower two converters of adaptive optimization combination control；
Figure 10 is wind power；
Figure 11 is power-sharing, the dynamic efficiency curve map of the lower parallel system of adaptive optimization combination control；
Figure 12 is the dynamic power distribution diagram of each parallel connection converter under power-sharing, adaptive optimization combination control.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, some changes and improvements can also be made.These belong to the present invention
Protection domain.
The present invention be directed to parallel connection type wind electric converter to propose a kind of adaptive optimization combination control method, each by optimizing
Power distribution between parallel connection converter, realize the whole efficiency lifting of parallel connection type current transformer.This method is only needed to parallel connection type unsteady flow
The control strategy of device is modified, and without increasing other equipment, and dynamic response is fast, and control flexibility ratio is high.
Parallel connection type current transformer refer to several independent three-phase voltage source converters (VSC) share ac bus composition be
System, as shown in figure 1, each converter can independently carry out active and reactive current decoupled control.Undulating according to wind power
The bearing power that condition, Automatic Combined converter operation number and each converter of real-time optimization undertake, becomes so as to lift parallel connection type
Flow the whole efficiency of device system.
By taking n converter parallel connection as an example, its power conversion schematic diagram is as shown in Fig. 2 ηT(PIN) it is that input power is PINWhen
The gross efficiency of parallel system, PIN、POUTRespectively total input of parallel system, power output, PIN,i、POUT,iRespectively converter i
Input, power output, ηi(PIN,i) it is input power PIN,iWhen converter i efficiency, the gross efficiency of parallel connection type current transformer is：
Due to each converter all same, therefore ηi(P) (i=1,2 ... n), when η (P) expression input powers are P by=η (P)
The transducer effciency of time, the converter i transducer effciency when input power is P is meant that with subscript, because each
The efficiency curve of converter is identical, so just representing that P, η here are to above P with η (P)in、ηiSimplification, parallel connection type unsteady flow
The gross efficiency of device can be reduced to：
Establish optimization object function：
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}
Constraints is：
The rated power of single inverter is PR, for simplifying the analysis, using perunit system, then 0≤Pn≤1.In order to realize
The adaptive optimization combination of parallel connection type current transformer total power section, with the 1 ‰ each operating point of power resolution off-line calculation system
Under optimum efficiency and its optimal power allocation ratio.
By taking two converter parallel connections as an example, optimization efficiency, power-division ratios curve under the combination control of its adaptive optimization
As shown in figure 5, the power-division ratios that offline optimization is obtained are made look-up table, the power distribution under each operating point of initialization system
Than being easy to online adaptive optimum organization, improving the speed of control algolithm.
As shown in figure 3, this method is as follows the step of specific implementation：
Numerical fitting：According to the efficiency value of each operating point of converter, using NUMERICAL MATCH METHOD FOR, obtain its efficiency curve with
Efficiency function.
Optimization object function：By the optimum efficiency under each operating point of object function off-line calculation parallel system and its most
Excellent power-division ratios, power resolution are 1 ‰.
Look-up table makes：Look-up table is made in the power-division ratios that offline optimization is obtained, and sets each work of parallel system
Power-division ratios under point, improve the speed of control algolithm.
Adaptive optimization combination control：The power instruction of each converter under any operating mode is obtained by look-up table, realized
Adaptive optimization combination control, improve the whole efficiency of system.
As shown in figure 1, by taking 3MW/4MVA parallel connection type wind electric converters as an example, its interface line voltage is 690V/50Hz, by
2 2MVA converter is formed in parallel, and the DC bus capacitance of each converter is 38.8mF, DC bus-bar voltage set-point
It is for 1100V, switching frequency 3kHz, LCL filter parameter：Current transformer side inductance is 100 μ H, median filter electric capacity is
668.4 μ F, power network equivalent inductance are 170 μ H, and power model uses the SKiiP1814GB17E4-3DUW of Semikron companies.
According to the parameter of above-mentioned parallel connection type wind electric converter, simulation analysis system is established based on Matlab/Simulink, tested
Demonstrate,prove quiet, the dynamic property of adaptive optimization combination control method：
(1) it is static：Efficiency optimization under each operating point of current transformer；
(2) dynamic：Adaptive optimal system efficiency under fluctuating power.
According to Fig. 4 single inverter efficiency curve, converter is obtained using MATLAB curve-fitting tools cftool
Fitting efficiency function, pass through the optimal power allocation ratio under each operating point of object function off-line calculation system, optimized algorithm stream
Journey is as shown in figure 5, wherein, intermediate variable caused by program calculating includes：
P1_optRepresent the optimal power allocation value of converter 1；
P2_optRepresent the optimal power allocation value of converter 2；
g_optRepresent majorized function optimal value；
P represents system operating power value；
P1iRepresent i-th of operating point of converter 1；
P2iRepresent i-th of operating point of converter 2；
ηiRepresent under i-th of operating point, the efficiency of parallel system；
P1Represent the power assignment value of converter 1 when system input power is P；
P2Represent the power assignment value of converter 2 when system input power is P；
ηopRepresent the optimum efficiency of parallel system when system input power is P.
The optimum efficiency curve of parallel system is as shown in fig. 6, optimal power allocation in Fig. 5, parallel system operation
Efficiency optimization.The power-division ratios of parallel system optimum organization are as shown in fig. 7, system load power is less than 0.329pu, at system
In unit operation pattern；Bearing power is higher than 0.329pu, the power optimization distribution of each converter.
Fig. 8, Fig. 9 are respectively the static effect of parallel system under power-sharing control and adaptive optimization combination control tactics
Rate curve, static power distribution, comparative analysis are visible：
(1) when the bearing power of current transformer is less than the 38% of rated power, adaptive optimization combination control can be effective
Lift the operational efficiency of parallel system.
(2) when the bearing power of current transformer is less than the 32.9% of rated power, under adaptive optimization combination control tactics,
Parallel system only has a converter actual motion, and the Optimal Control Strategy can be according to bearing power situation combined converter
Run quantity.
Figure 10 is the Wind turbines wind power curve of 70 minutes, and Figure 11, Figure 12 are respectively power-sharing control and adaptive
Under optimum organization control strategy, the dynamic power distribution of the dynamic efficiency curve of parallel system, each converter when fluctuating wind power,
Comparative analysis is visible：
(1) adaptive optimization combination control tactics can lift the overall effect of the parallel connection type converter system under fluctuating power
Rate.
(2) adaptive optimization combined strategy can be according to wind power swing situation, and Automatic Combined converter operation number is simultaneously
The bearing power that each converter of real-time optimization undertakes.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or change within the scope of the claims, this not shadow
Ring the substantive content of the present invention.In the case where not conflicting, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
- A kind of 1. method of the lifting operational efficiency of parallel connection type wind electric converter, it is characterised in that including：Numerical fitting step：According to the efficiency value of each operating point of converter in parallel connection type wind electric converter, numerical fitting side is utilized Method, obtain the efficiency curve and efficiency function of parallel connection type wind electric converter；Optimization object function step：By under each operating point of optimization object function off-line calculation parallel connection type wind electric converter most Excellent efficiency and optimal power allocation ratio；Look-up table making step：Look-up table is made in the optimal power allocation ratio that off-line calculation is obtained, and setting parallel connection type wind-powered electricity generation becomes Flow the power-division ratios under each operating point of device.
- 2. the method for the lifting operational efficiency of parallel connection type wind electric converter according to claim 1, it is characterised in that described Optimization object function step is each by optimization object function off-line calculation parallel connection type wind electric converter with 1 ‰ power resolution Optimum efficiency and optimal power allocation ratio under operating point.
- 3. the method for the lifting operational efficiency of parallel connection type wind electric converter according to claim 1, it is characterised in that also wrap Include：Adaptive optimization combines rate-determining steps：The power instruction of each converter under any operating mode is obtained by look-up table, realized Adaptive optimization combination control.
- 4. the method for the lifting operational efficiency of parallel connection type wind electric converter according to claim 1, it is characterised in that optimization Object function is：G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it is that input power is PINWhen parallel system gross efficiency, PIN,iFor converter i's Input power, i=1,2 ..., n.
- 5. the method for the lifting operational efficiency of parallel connection type wind electric converter according to claim 4, it is characterised in that optimization Bound for objective function is：<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> </mrow> </msub> <mo>=</mo> <mstyle> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mstyle> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> <mo>&le;</mo> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>&le;</mo> <msub> <mi>P</mi> <mi>R</mi> </msub> </mtd> </mtr> </mtable> </mfenced>PRFor the rated power of single inverter.
- A kind of 6. system of the lifting operational efficiency of parallel connection type wind electric converter, it is characterised in that including：Numerical fitting module：According to the efficiency value of each operating point of converter in parallel connection type wind electric converter, numerical fitting side is utilized Method, obtain the efficiency curve and efficiency function of parallel connection type wind electric converter；Optimization object function module：By under each operating point of optimization object function off-line calculation parallel connection type wind electric converter most Excellent efficiency and optimal power allocation ratio；Look-up table makes module：Look-up table is made in the optimal power allocation ratio that off-line calculation is obtained, and setting parallel connection type wind-powered electricity generation becomes Flow the power-division ratios under each operating point of device.
- 7. the system of the lifting operational efficiency of parallel connection type wind electric converter according to claim 6, it is characterised in that described Optimization object function step is each by optimization object function off-line calculation parallel connection type wind electric converter with 1 ‰ power resolution Optimum efficiency and optimal power allocation ratio under operating point.
- 8. the system of the lifting operational efficiency of parallel connection type wind electric converter according to claim 6, it is characterised in that also wrap Include：Adaptive optimization combines rate-determining steps：The power instruction of each converter under any operating mode is obtained by look-up table, realized Adaptive optimization combination control.
- 9. the system of the lifting operational efficiency of parallel connection type wind electric converter according to claim 6, it is characterised in that optimization Object function is：G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it is that input power is PINWhen parallel system gross efficiency, PIN,iFor converter i's Input power, i=1,2...n.
- 10. the system of the lifting operational efficiency of parallel connection type wind electric converter according to claim 9, it is characterised in that excellent Changing bound for objective function is：<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> </mrow> </msub> <mo>=</mo> <mstyle> <munderover> <mo>&Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>n</mi> </munderover> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mstyle> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> <mo>&le;</mo> <msub> <mi>P</mi> <mrow> <mi>I</mi> <mi>N</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>&le;</mo> <msub> <mi>P</mi> <mi>R</mi> </msub> </mtd> </mtr> </mtable> </mfenced>PRFor the rated power of single inverter.
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| CN109787291A (en) * | 2019-03-26 | 2019-05-21 | 阳光电源股份有限公司 | Modularization cascade multilevel converter and its module switching method and controller |
| CN111193286A (en) * | 2020-01-15 | 2020-05-22 | 云南电网有限责任公司电力科学研究院 | Coordination control method for combined converter in photovoltaic direct-current boosting and collecting system |
| CN111193286B (en) * | 2020-01-15 | 2023-04-07 | 云南电网有限责任公司电力科学研究院 | Coordination control method for combined converter in photovoltaic direct-current boosting and collecting system |
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| CN111431397B (en) * | 2020-04-23 | 2022-06-03 | 西安捷航电子科技有限公司 | Efficiency optimization method of converter parallel system based on parameter optimization method |
| CN113270892A (en) * | 2021-06-08 | 2021-08-17 | 上海电气风电集团股份有限公司 | Wind turbine generator set, control method and device thereof, electronic equipment and storage medium |
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