Harmonic suppression method and system for generator-side converter of eighteen-phase direct drive permanent magnet wind generator, and medium
A wind turbine and harmonic suppression technology, applied in electrical components, output power conversion devices, etc., can solve problems such as torque ripple, increased iron and copper consumption of generators, and impact on generator operation and life. The effect of preventing iron and copper consumption, prolonging operating life, and improving power generation efficiency
Inactive Publication Date: 2019-07-26
HUNAN UNIV
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Problems solved by technology
Since traditional multi-phase permanent magnet generators cannot be completely decoupled, high-performance control of the generator is difficult to achieve
On the other hand, the switching frequency of the PWM converter on the side of the offshore MW-level wind turbine is low, and the harmonic content of the input and output current is relatively high.
A large number of harmonics will increase the iron and copper consumption of the generator, cause torque ripple, reduce the power generation efficiency of the wind turbine, and have a serious impact on the operation and life of the generator
The 18-phase direct-drive permanent magnet wind turbine is a new type of wind turbine with high reliability, simple structure and easy modular assembly. The control of the machine-side converter is generally realized by using the traditional PI controller. However, the traditional PI controller cannot realize the harmonic suppression of the generator side converter
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[0027] Such as figure 1 As shown, the implementation steps of the harmonic suppression method for the machine-side converter of the 18-phase direct-drive permanent magnet wind turbine in this embodiment include:
[0028] 1) Obtain the rotational speed ω of the eighteen-phase direct-drive permanent magnet wind turbine and the sum of the d-axis response current and the sum of the q-axis response current of the six three-phase permanent magnet motor units;
[0029] 2) Input the rotational speed ω, the deviation between the d-axis command current and the sum of 1 / 6 of the d-axis response current, and the deviation between the q-axis command current and 1 / 6 of the sum of the q-axis response current into the proportional integral resonant controller to obtain the d-axis voltage u dref and q-axis voltage U qref ;
[0030] 3) Set the d-axis voltage U dref and q-axis voltage U qref After coordinate transformation, the α-axis voltage U αref and β-axis voltage U βref ;
[0031] 4...
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The invention discloses a harmonic suppression method and system for a generator-side converter of an eighteen-phase direct drive permanent magnet wind generator, and a medium. The harmonic suppression method for the generator-side converter provided by the invention has the steps of inputting a deviation of a rotation speed omega, a d shaft command current and 1/6 of the sum of d shaft response currents, and a deviation of a q shaft command current and the 1/6 of the sum of d shaft response currents into a proportional-integral resonant controller to acquire a d shaft voltage Udref and a q shaft voltage Uqref; and controlling the working condition of the generator-side converter of the eighteen-phase direct drive permanent magnet wind generator through adjusting and generating a switchingsignal. According to the method and system provided by the invention, the specified times of harmonic suppression are performed on the generator-side converter of the eighteen-phase direct drive permanent magnet wind generator, so that the purposes of eliminating stator current harmonics and improving current waveform are achieved, and thus the problem that iron consumption and copper consumptionof the generator are increased and the torque pulse is caused by the harmonics can be avoided, the generating efficiency of the wind generator unit can be effectively enhanced, and the service life of the generator can be prolonged.
Description
technical field [0001] The present invention relates to a harmonic suppression technology for a machine-side converter of a wind power generator, in particular to a harmonic suppression method, system and medium for a machine-side converter of an 18-phase direct-drive permanent magnet wind power generator, which can realize a new type of The machine-side converter of the 18-phase direct-drive permanent magnet wind turbine is used for harmonic suppression. Background technique [0002] Wind power is a strategic emerging industry for my country to seize the commanding heights of a new round of economic and technological competition and global energy transformation. According to statistics, my country's accumulative wind power installed capacity has reached 75.564 million kW, becoming the world's largest wind power generation country, with an annual power generation of more than 100 billion kWh, accounting for 2% of electricity demand, and the scale of wind power is still incre...
Claims
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IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 黄守道吴公平饶志蒙黄晟王梓萌罗德荣罗成伟
Owner HUNAN UNIV
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