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 into DC power output, output power conversion devices, etc. Technical problems Midpoint voltage balance, no system, etc.

Active Publication Date: 2013-05-01
丹阳博亚新材料技术服务有限公司
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  • Abstract
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  • Claims
  • 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, wi

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

[0028] A specific harmonic elimination control method for a three-level neutral point clamped photovoltaic inverter, comprising the following steps:

[0029] ①Establish the mathematical model of the specific harmonic elimination control method of the three-level neutral point clamped photovoltaic inverter:

[0030] The single-phase voltage waveform of the three-level midpoint clamped photovoltaic inverter satisfies 1 / 4 cycle symmetry. According to the Diric hlet theorem, the waveform can be decomposed into the following Fourier series:

[0031] 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 specific harmonic elimination control method for a three-level midpoint clamp photovoltaic inverter. Background technique [0002] The specific harmonic elimination control method of the three-level neutral point clamped photovoltaic inverter properly controls the pulse width modulation voltage waveform of the inverter through the optimal selection of the switching time, so that there are no certain harmonics in the output voltage of the inverter. Specific self-lower) harmonics. [0003] The difficulty of the specific harmonic elimination control method is mainly that it must solve a set of nonlinear transcendental equations. The traditional method is to use the Newton iterative method. This method requires a set of initial values ​​to solve the nonlinear equations. The selection of the initial value is appropriate and Whether or not directly determines whether the algorithm converges, so the selection of the initial value s...

Claims

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Application Information

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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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