CN101699760B - Dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator - Google Patents
Dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator Download PDFInfo
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Abstract
The invention relates to a dynamic power control system of a variable speed constant frequency doubly-fed asynchronous wind-driven generator. The dynamic power control system comprises a doubly-fed generator and is characterized in that the power control system contains a control unit, a PWM pulse generation unit, a converter and a detection unit. The dynamic power control system has the advantage that 1) the flexible grid connection is beneficial to realize; 2) the active power and reactive power of the generator can be independently regulated; 3) the capacity of the converter is reduced so as to reduce the cost of the converter; 4) the wind energy can be fully used; 5) the optimization of power control can be reached; and 6) the information fusion algorithm is easy to carry out without sacrificing the real-time property.
Description
(1) technical field:
The invention belongs to wind generator system control appliance technical field, particularly a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator.
(2) background technology:
Wind power generation is the most cheap, the most promising and inexhaustible, nexhaustible " green energy resource " in the regenerative resource.At present, the grid type wind power system mainly is made up of five models, that is: wind-field model, wind energy conversion system model, axle are model, asynchronous generator model and electric network model.Wherein the asynchronous generator model is the core of wind power system.Traditional wind-driven generator mainly adopts decides slurry apart from the constant-speed and constant-frequency mode, because this mode can only be fixed on a certain rotating speed, causes the wind resource waste, and wind energy utilization is low.Therefore present wind-driven generator mainly uses the doubly-fed variable-speed constant-frequency asynchronous wind driven generator, and variable speed constant frequency dual-feed asynchronous wind power generator also becomes the research focus in the wind generator system.
(3) summary of the invention:
The objective of the invention is to design a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator; It can overcome the deficiency of prior art; Make dual-feed asynchronous wind power generator under different wind speed, can export maximum active power; And, effectively protect double-fed wind power generator reaching the caloric value that critical wind velocity reduces generator.
Technical scheme of the present invention: a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator, comprise double-fed generator, it is characterized in that it is by control unit, pwm pulse generating unit, frequency converter and detecting unit; Wherein, the input of said control unit is connected with the output of detecting unit, and its output is connected with the input of pwm pulse generating unit; The output of said pwm pulse generating unit is connected with the input of frequency converter; The output of said frequency converter is connected with the input of the input of double-fed generator and detecting unit.
Above-mentioned said control unit be by current transformer constitute, slip electric current calculator, 3/2 coordinate converter, dsp chip, magnetic linkage/power calculator and 2/3 coordinate converter; Wherein, the current signal of the stator of the double-fed asynchronous generator that the input received current instrument transformer of said slip electric current calculator is gathered output, its output is connected with the input of 3/2 coordinate converter; The output of said 3/2 coordinate converter is connected with the input of dsp chip; The input of said 2/3 coordinate converter is connected with the output of magnetic linkage/power calculator; The input of said magnetic linkage/power calculator receives the current signal that voltage transformer is gathered; The input of said dsp chip is connected with the output of 3/2 coordinate converter and the output of 2/3 coordinate converter, and its output output pwm pulse control signal, sends the pwm pulse generating unit to.
Above-mentioned said DSP is the TMS320C6713B chip.
Above-mentioned said magnetic linkage/power calculator and slip electric current calculator are all selected 8086 single-chip microcomputers of Intel Company for use.
Operation principle of the present invention is: dual-feed asynchronous wind power generator is as controlled device; The active power of its output of this control system major control; Utilize current transformer and voltage transformer to detect the electric current and the voltage of its output; In slip electric current calculator, compare the slip electric current that draws at a time after utilizing magnetic linkage-power calculator with detected active power of output decoupling zero with the rotor current of importing; Regulate the slip electric current and just can under the situation that rotor current changes, keep the stable of exciting current; Thereby can guarantee the stable of dual-feed asynchronous wind power generator stator output frequency, can also guarantee in wind speed changes, to seek the maximization of dual-feed asynchronous wind power generator power output in addition; Frequency converter is mainly used in and produces main circuit slip electric current; Mainly form by rectifier and inverter; Frequency converter is chosen the frequency converter of obstructed capacity according to different double-fed asynchronous generators, and frequency converter and pwm signal converter interconnect, by pwm signal convertor controls frequency converter output current frequency.
Superiority of the present invention: 1. can realize the constant frequency generation under the different rotating speeds, be beneficial to realize that flexibility is incorporated into the power networks through regulating the slip power frequency; But the 2. active power of generator and reactive power independent regulation; 3. because slip power only accounts for the very little part of rated power, thereby reduced frequency inverter capacity greatly and reduced the frequency converter cost; 4. speed variant frequency constant dual feedback asynchronous generator dynamic power control system can reach the maximum use to wind energy when realizing variable speed constant frequency; 5. through to the control of slip power to reach the optimization of power control; 6. DSP selects TMS320C6713B for use, and its high performance chip characteristics makes it be easy to carry out information fusion algorithm and can not sacrifice its real-time.
(4) description of drawings:
Fig. 1 is the structured flowchart of the related a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator of the present invention.
Fig. 2 is the structured flowchart of control unit in the related a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator of the present invention.
Fig. 3 is system's control sketch map of the related a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator of the present invention.
(5) embodiment:
Embodiment: a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator (see figure 1), comprise double-fed generator, it is characterized in that it is by control unit, pwm pulse generating unit, frequency converter and detecting unit; Wherein, the input of said control unit is connected with the output of detecting unit, and its output is connected with the input of pwm pulse generating unit; The output of said pwm pulse generating unit is connected with the input of frequency converter; The output of said frequency converter is connected with the input of the input of double-fed generator and detecting unit.
Above-mentioned said control unit (see figure 2) be by current transformer constitute, slip electric current calculator, 3/2 coordinate converter, dsp chip, magnetic linkage/power calculator and 2/3 coordinate converter; Wherein, the current signal of the stator of the double-fed asynchronous generator that the input received current instrument transformer of said slip electric current calculator is gathered output, its output is connected with the input of 3/2 coordinate converter; The output of said 3/2 coordinate converter is connected with the input of dsp chip; The input of said 2/3 coordinate converter is connected with the output of magnetic linkage/power calculator; The input of said magnetic linkage/power calculator receives the current signal that voltage transformer is gathered; The input of said dsp chip is connected with the output of 3/2 coordinate converter and the output of 2/3 coordinate converter, and its output output pwm pulse control signal, sends the pwm pulse generating unit to.
Above-mentioned said DSP is the TMS320C6713B chip; Its fast operation, precision height; Improved Harvard structure, advanced multibus and multi-stage pipeline mechanism, special-purpose hardware multiplier, instruction set efficiently; Make it be easy to carry out information fusion algorithm and can not sacrifice its real-time, therefore select TMS320C6713B control core for use.。
Above-mentioned said magnetic linkage/power calculator and slip electric current calculator are all selected 8086 single-chip microcomputers of Intel Company for use.
It is hardware foundation that above-mentioned said 3/2 coordinate converter is selected the built-in arithmetic unit of DSP for use, links to each other with slip electric current calculator, by slip electric current calculator input three-phase signal, becomes among the corresponding two phase signals input DSP through 3 changes in coordinates device.
It is hardware foundation that above-mentioned said 2/3 coordinate converter is also selected the built-in arithmetic unit of DSP for use, with magnetic linkage power calculator link to each other, by magnetic linkage power calculator input three-phase signal, through 3 the changes in coordinates device become among the corresponding two phase signals input DSP.。
Above-mentioned said magnetic linkage-power calculator is selected 8086 single-chip microcomputers of Intel Company for use,
Above-mentioned said slip electric current calculator is also selected 8086 single-chip microcomputers of Intel Company for use; Its input circuit links to each other with magnetic linkage-power calculator output interface circuit with 2/3 coordinate converter output interface circuit among the DSP, and its output circuit links to each other with 3/2 coordinate converter output interface circuit among the DSP.
Claims (3)
1. a dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator comprises double-fed generator, it is characterized in that it also comprises control unit, pwm pulse generating unit, frequency converter and detecting unit; Wherein, the input of said control unit is connected with the output of detecting unit, and its output is connected with the input of pwm pulse generating unit; The output of said pwm pulse generating unit is connected with the input of frequency converter; The output of said frequency converter is connected with the input of the input of double-fed generator and detecting unit; Said control unit is to be made up of current transformer, slip electric current calculator, 3/2 coordinate converter, dsp chip, magnetic linkage/power calculator and 2/3 coordinate converter; Wherein, the current signal of the stator of the double-fed asynchronous generator that the input received current instrument transformer of said slip electric current calculator is gathered output, its output is connected with the input of 3/2 coordinate converter; The output of said 3/2 coordinate converter is connected with the input of dsp chip; The input of said 2/3 coordinate converter is connected with the output of magnetic linkage/power calculator; The input of said magnetic linkage/power calculator receives the current signal that voltage transformer is gathered; The input of said dsp chip is connected with the output of 3/2 coordinate converter and the output of 2/3 coordinate converter, and its output output pwm pulse control signal, sends the pwm pulse generating unit to.
2. according to a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator described in the claim 1, it is characterized in that said DSP is the TMS320C6713B chip.
3. according to a kind of dynamic power control system of variable speed constant frequency doubly-fed asynchronous wind-driven generator described in the claim 1, it is characterized in that said magnetic linkage/power calculator and slip electric current calculator all select 8086 single-chip microcomputers of Intel Company for use.
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Inventor after: Yue Weipeng Inventor after: Ma Buyun Inventor after: Zhou Xuesong Inventor after: Wu Lei Inventor after: Ma Youjie Inventor after: Li Ji Inventor after: Xu Lijin Inventor after: Wen Hulong Inventor after: Zhang Shurui Inventor after: Yang Haishan Inventor before: Zhou Xuesong Inventor before: Wu Lei Inventor before: Ma Youjie Inventor before: Li Ji Inventor before: Xu Lijin Inventor before: Wen Hulong Inventor before: Zhang Shurui Inventor before: Yang Haishan |
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Free format text: CORRECT: INVENTOR; FROM: ZHOU XUESONG WU LEI MA YOUJIE LI JI XU LIJIN WEN HULONG ZHANG SHURUI YANG HAISHAN TO: YUE WEIPENG ZHOU XUESONG WU LEI MA YOUJIE LI JI XU LIJIN WEN HULONG ZHANG SHURUI YANG HAISHAN MA BUYUN Free format text: CORRECT: ADDRESS; FROM: 300384 NANKAI, TIANJIN TO: 100031 DONGCHENG, BEIJING |
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Effective date of registration: 20131206 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: State Grid Xinyuan Zhangjiakou Scenery Storage Demonstration Power Plant Co., Ltd. Address before: 300384 Nankai District Hongqi Road extension line, Tianjin, Tianjin University of Technology Patentee before: Tianjin University of Technology |