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Control method for canceling specified harmonics of three-level midpoint clamp photovoltaic inverter

A specific harmonic elimination, photovoltaic inverter technology, applied in the direction of electrical components, AC power input to DC power output, output power conversion devices, etc. The overall performance of the photovoltaic inverter has no system problems, and it is easy to realize online control, reduce total harmonic distortion, and improve the output waveform.

Active Publication Date: 2015-05-06
丹阳博亚新材料技术服务有限公司
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  • Application Information

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Problems solved by technology

There is no systematic and effective method for selecting the initial value, and researchers generally use the trial and error method, which is very inefficient
And the traditional specific harmonic elimination control method only starts from the perspective of eliminating specific low-order harmonics, without considering the overall performance of the photovoltaic inverter
For the three-level neutral-point clamped photovoltaic inverter, while eliminating specific harmonics, the key technical issue of the three-level neutral-point clamped inverter-the neutral point voltage balance problem is not considered

Method used

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  • Control method for canceling specified harmonics of three-level midpoint clamp photovoltaic inverter
  • Control method for canceling specified harmonics of three-level midpoint clamp photovoltaic inverter
  • Control method for canceling specified harmonics of three-level midpoint clamp photovoltaic inverter

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Embodiment Construction

[0027] A three-level neutral-point clamped photovoltaic inverter specific harmonic elimination control method includes the following steps:

[0028] ①Establish the mathematical model of the specific harmonic elimination control method of the three-level neutral point clamp photovoltaic inverter:

[0029] The single-phase voltage waveform of the three-level mid-point clamped photovoltaic inverter satisfies the 1 / 4 period symmetry. According to Dirichlet's theorem, the waveform can be decomposed into the following Fourier series:

[0030] U AN ( ωt ) = A 0 2 + Σ n = 1 ∞ [ A n sin ( nωt ) + B ...

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Abstract

The invention discloses a control method for canceling specified harmonics of a three-level midpoint clamp photovoltaic inverter. The control method comprises the following steps of: firstly, establishing a mathematical model of the control method for the specified harmonics of the three-level midpoint clamp photovoltaic inverter and solving the following nonlinear transcendental equations; secondly, establishing a midpoint current mathematical model of the three-level midpoint clamp photovoltaic inverter; and thirdly, solving by adopting a continuous space ant colony algorithm. According to the control method disclosed by the invention, the control method for canceling the specified harmonics of the three-level midpoint clamp photovoltaic inverter is combined with midpoint voltage balance; the midpoint voltage balance can be effectively controlled while the specified low-order harmonics are canceled, so that an output waveform is greatly improved and the total harmonic distorsion is reduced.

Description

technical field [0001] The invention relates to a control method for eliminating specific harmonics of a three-level midpoint clamping photovoltaic inverter. Background technique [0002] The specific harmonic elimination control method of the three-level mid-point clamped photovoltaic inverter can properly control the PWM voltage waveform of the inverter through the optimal selection of the switching time, so that there is no certain harmonic in the output voltage of the inverter. specific (lower) harmonics. [0003] The difficulty of the specific harmonic elimination control method is mainly that a set of nonlinear transcendental equations must be solved. The traditional method is to use the Newton iteration method. This method needs a set of initial values ​​to solve the nonlinear equation system. Whether or not it directly determines whether the algorithm converges, so the selection of the initial value should be as close as possible to the solution of the equation. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12H02M7/487
Inventor 胡存刚王建成刘三山
Owner 丹阳博亚新材料技术服务有限公司
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