CN107508311B - The method and system of the promotion operational efficiency of parallel connection type wind electric converter - Google Patents
The method and system of the promotion operational efficiency of parallel connection type wind electric converter Download PDFInfo
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Abstract
The present invention provides a kind of method grade systems of the promotion operational efficiency of parallel connection type wind electric converter, it include: the efficiency value according to 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 obtains, 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, realize that the whole efficiency of parallel connection type current transformer is promoted.This method only needs the control strategy to parallel connection type current transformer to modify, 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 fields, and in particular, to the side of the promotion operational efficiency of parallel connection type wind electric converter
Method and system.
Background technique
Currently, 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 develop from land to sea, 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 generally uses different transform
The mode of device parallel connection is realized.
Under traditional control method, parallel converter system mostly uses power-sharing mode operation, and this mode is suitable for negative
Carry the application of power stability.For wind electric converter, random, the wave characteristic of wind energy make the load on converter
Power swing is very big, and average load power is lower than the 50% of rated power.The operational efficiency of current transformer depends on it and loads function
Rate, under different operating point, efficiency variance is larger, especially low load operating point, and 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, needs to propose new operation control strategy, promotes its overall operation efficiency.
Currently, being concentrated in the promotion of single inverter efficiency for the research for promoting current transformer efficiency both at home and abroad, 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 the patent of invention of Publication No. CN105870957A is public
A kind of dynamic direct current bus voltage control method for improving back-to-back converter efficiency is opened, which passes through dynamic regulation direct current
Busbar voltage reference value, the work for keeping current transformer adaptive is in minimum direct current busbar voltage, 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, is not suitable for and imitates with parallel system
The promotion of rate, and dynamic regulation bus given value, it is larger to will cause voltage fluctuation on DC capacitor, increases capacitor stress, can drop
The reliability of low capacitor, system.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of promotion of parallel connection type wind electric converter operations
The method of efficiency.
The method that the adaptive optimization combination of the parallel connection type wind electric converter provided according to the present invention promotes operational efficiency, packet
It includes:
Numerical fitting step: quasi- using numerical value according to the efficiency value of each operating point of converter in parallel connection type wind electric converter
Conjunction method obtains 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 obtains, 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, further includes:
Adaptive optimization combines rate-determining steps: the power instruction of each converter under any operating condition is obtained by searching for table,
Realize adaptive optimization combination control.
Preferably, optimization object function are as follows:
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it be input power is PINWhen parallel system gross efficiency, PIN,iFor converter
The input power of i, i=1,2...n.
Preferably, the constraint condition of optimization object function are as follows:
PRFor the rated power of single inverter.
A kind of system of the promotion operational efficiency of the parallel connection type wind electric converter provided according to the present invention, comprising:
Numerical fitting module: quasi- using numerical value according to the efficiency value of each operating point of converter in parallel connection type wind electric converter
Conjunction method obtains 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 obtains, 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, further includes:
Adaptive optimization combines rate-determining steps: the power instruction of each converter under any operating condition is obtained by searching for table,
Realize adaptive optimization combination control.
Preferably, optimization object function are as follows:
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
ηT(PIN,1,PIN,2,…PIN,i…PIN,n) it be input power is PINWhen parallel system gross efficiency, PIN,iFor converter
The input power of i, i=1,2...n.
Preferably, the constraint condition of optimization object function are as follows:
PRFor the rated power of single inverter.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, it realizes that the optimum organization of each converter controls by the control technology of current transformer itself, does not need to increase any auxiliary
Help equipment；
2, it can be realized the load adaptive optimization of each parallel connection converter；
3, fast response time.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram 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 promotion 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 graph of two converter parallel systems；
Fig. 7 is the power distribution figure of two converter parallel system optimum organization；
Fig. 8 is the static efficiency curve graph of power-sharing, the lower parallel system of adaptive optimization combination control；
Fig. 9 is the static power distribution diagram of power-sharing, lower two converters of adaptive optimization combination control；
Figure 10 is wind power graph；
Figure 11 is the dynamic efficiency curve graph of power-sharing, 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.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
The present invention be directed to parallel connection type wind electric converters to propose a kind of adaptive optimization combination control method, each by optimizing
Power distribution between parallel connection converter realizes that the whole efficiency of parallel connection type current transformer is promoted.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, to promote parallel connection type change
Flow the whole efficiency of device system.
By taking n converter is in parallel as an example, power conversion schematic diagram is as shown in Fig. 2, ηT(PIN) it be input power is PINWhen
The gross efficiency of parallel system, PIN、POUTRespectively total input of parallel system, output power, PIN,i、POUT,iRespectively converter i
Input, output power, ηi(PIN,i) it is input power PIN,iWhen converter i efficiency, the gross efficiency of parallel connection type current transformer are as follows:
Since each converter is all the same, ηi(P) (i=1,2 ... n), when η (P) indicates that input power is P by=η (P)
The transducer effciency of time means that the transducer effciency when input power is P of converter i with subscript, because each
The efficiency curve of converter is identical, so just indicating that P, η here is to front P with η (P)in、ηiSimplification, parallel connection type unsteady flow
The gross efficiency of device can simplify are as follows:
Establish optimization object function:
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}
Constraint condition are as follows:
The rated power of single inverter is PR, for simplifying the analysis, using mark system, then 0≤Pn≤1.In order to realize
The adaptive optimization of parallel connection type current transformer total power section combines, with the 1 ‰ each operating point of power resolution off-line calculation system
Under optimum efficiency and its optimal power allocation ratio.
Optimization efficiency, power-division ratios curve by taking two converters are in parallel as an example, under adaptive optimization combination control
As shown in figure 5, look-up table is made in the power-division ratios that offline optimization is obtained, the power distribution under each operating point of system is set
Than being convenient for 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 objective function off-line calculation parallel system and its most
Excellent power-division ratios, power resolution are 1 ‰.
Look-up table production: 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 condition is obtained by searching for table, is realized
Adaptive optimization combination control, improves the whole efficiency of system.
As shown in Figure 1, interface network voltage is 690V/50Hz by taking 3MW/4MVA parallel connection type wind electric converter as an example, by
The converter of 2 2MVA is formed in parallel, and the DC bus capacitance of each converter is 38.8mF, DC bus-bar voltage given value
For 1100V, switching frequency 3kHz, LCL filter parameter are as follows: current transformer side inductance is 100 μ H, median filter capacitor is
668.4 μ F, power grid equivalent inductance are 170 μ H, and power module uses the SKiiP1814GB17E4-3DUW of Semikron company.
According to the parameter of above-mentioned parallel connection type wind electric converter, simulation analysis system is established based on Matlab/Simulink, is tested
Demonstrate,prove quiet, the dynamic property of adaptive optimization combination control method:
(1) static: the efficiency optimization under each operating point of current transformer；
(2) dynamic: adaptive optimal system efficiency under fluctuating power.
According to the single inverter efficiency curve of Fig. 4, converter is obtained using MATLAB curve-fitting tool cftool
Fitting efficiency function passes through the optimal power allocation ratio under each operating point of objective function off-line calculation system, optimization algorithm stream
Journey is as shown in Figure 5, wherein program calculates the intermediate variable generated and includes:
P1_optIndicate the optimal power allocation value of converter 1；
P2_optIndicate the optimal power allocation value of converter 2；
g_optIndicate majorized function optimal value；
P indicates system operating power value；
P1iIndicate i-th of operating point of converter 1；
P2iIndicate i-th of operating point of converter 2；
ηiIt indicates under i-th of operating point, the efficiency of parallel system；
P1Indicate the power assignment value of converter 1 when system input power is P；
P2Indicate the power assignment value of converter 2 when system input power is P；
ηopIndicate the optimum efficiency of parallel system when system input power is P.
As shown in fig. 6, according to the optimal power allocation in Fig. 5, parallel system is run the optimum efficiency curve of parallel system
Efficiency optimization.The power-division ratios of parallel system optimum organization are as shown in fig. 7, system load power is lower than 0.329pu, at system
In single-unit operation mode；Bearing power is higher than 0.329pu, and the power optimization of each converter distributes.
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 lower than the 38% of rated power, adaptive optimization combination control can be effective
Promote the operational efficiency of parallel system.
(2) when the bearing power of current transformer is lower than the 32.9% of rated power, under adaptive optimization combination control tactics,
Only one converter actual motion of parallel system, the Optimal Control Strategy can be according to bearing power situation combined converters
Run quantity.
Figure 10 is Wind turbines 70 minutes wind power curve, 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, each converter of parallel system when fluctuating wind power,
Comparative analysis is visible:
(1) adaptive optimization combination control tactics are able to ascend the whole 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.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (4)
1. a kind of method of the promotion operational efficiency of parallel connection type wind electric converter characterized by comprising
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 obtains 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 obtains, setting parallel connection type wind-powered electricity generation becomes
Flow the power-division ratios under each operating point of device；
Wherein, the gross efficiency of parallel connection type current transformer are as follows:
ηT(PIN) it be input power is PINWhen parallel system gross efficiency, PIN、POUTRespectively total input, the output of parallel system
Power, PIN,i、POUT,iThe respectively input of converter i, output power, ηi(PIN,i) it is input power PIN,iWhen converter i effect
Rate,
Since each converter is all the same, ηi(P) (i=1,2 ... n), and η (P) is indicated when input power is P by=η (P)
Transducer effciency means that the transducer effciency when input power is P of converter i with subscript, each converter
Efficiency curve is identical, indicates that P, η here is to front P with η (P)IN、ηiSimplification, the gross efficiency of parallel connection type current transformer simplifies
Are as follows:
Establish optimization object function:
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
Constraint condition are as follows:
The rated power of single inverter is PR, using mark system, then 0≤Pn≤ 1, with 1 ‰ power resolution off-line calculation
Optimum efficiency and optimal power allocation ratio under each operating point of parallel connection type wind electric converter.
2. the method for the promotion operational efficiency of parallel connection type wind electric converter according to claim 1, which is characterized in that also wrap
It includes:
Adaptive optimization combines rate-determining steps: obtaining the power instruction of each converter under any operating condition by searching for table, realizes
Adaptive optimization combination control.
3. a kind of system of the promotion operational efficiency of parallel connection type wind electric converter characterized by comprising
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 obtains 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 obtains, setting parallel connection type wind-powered electricity generation becomes
Flow the power-division ratios under each operating point of device；
Wherein, the gross efficiency of parallel connection type current transformer are as follows:
ηT(PIN) it be input power is PINWhen parallel system gross efficiency, PIN、POUTRespectively total input, the output of parallel system
Power, PIN,i、POUT,iThe respectively input of converter i, output power, ηi(PIN,i) it is input power PIN,iWhen converter i effect
Rate,
Since each converter is all the same, ηi(P) (i=1,2 ... n), and η (P) is indicated when input power is P by=η (P)
Transducer effciency means that the transducer effciency when input power is P of converter i with subscript, each converter
Efficiency curve is identical, indicates that P, η here is to front P with η (P)IN、ηiSimplification, the gross efficiency of parallel connection type current transformer simplifies
Are as follows:
Establish optimization object function:
G=max { ηT(PIN,1,PIN,2,…PIN,i…PIN,n)}；
Constraint condition are as follows:
The rated power of single inverter is PR, using mark system, then 0≤Pn≤ 1, with 1 ‰ power resolution off-line calculation
Optimum efficiency and optimal power allocation ratio under each operating point of parallel connection type wind electric converter.
4. the system of the promotion operational efficiency of parallel connection type wind electric converter according to claim 3, which is characterized in that also wrap
It includes:
Adaptive optimization combines rate-determining steps: obtaining the power instruction of each converter under any operating condition by searching for table, realizes
Adaptive optimization combination control.
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| CN108988400B (en) * | 2018-07-03 | 2021-04-27 | 中国科学院广州能源研究所 | Power distribution method for multi-machine parallel power electronic transformer and electronic equipment |
| CN108923937A (en) * | 2018-07-23 | 2018-11-30 | 广东电网有限责任公司 | A kind of similar port power distribution method of electric energy router group system and device |
| CN109787291B (en) * | 2019-03-26 | 2021-06-11 | 阳光电源股份有限公司 | Modular cascade multilevel converter, module switching method thereof and controller |
| 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 |
| 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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Effective date of registration: 20231107 Address after: 201109 floor 3, building B, No. 940 Jianchuan Road, Minhang District, Shanghai Patentee after: Shanghai Zhonglv New Energy Technology Co.,Ltd. Address before: 200240 room 110 and 111, building 3, No. 600, Jianchuan Road, Minhang District, Shanghai Patentee before: Shanghai Jiaotong University Intellectual Property Management Co.,Ltd. Patentee before: Cai Xu |