Single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current

A cross-feedback, high-precision technology applied in AC networks to reduce harmonics/ripples, reactive power compensation, harmonic reduction devices, etc.

Inactive Publication Date: 2016-12-07
天津百利机械装备研究院有限公司
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Problems solved by technology

According to the principle of algorithm detection, harmonic and reactive power detection algorithms are mainly divided into harmonic detection algorithms based on instantaneous power and harmonic detection algorithms based on Fourier transform. The former has good dynamic characteristics, while the latter has higher precision, but there is a cycle delay

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  • Single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current
  • Single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current
  • Single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current

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Embodiment Construction

[0031] In order to further understand the content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0032] Such as Figure 1 to Figure 5 : A single-phase high-precision fast cross-feedback decoupling harmonic and reactive current extraction method,

[0033] 1) Set grid voltage and current mathematical expressions:

[0034] Let the grid voltage be formula (0)

[0035] u s (t)=U s cos wt (0)

[0036] The periodic non-sinusoidal grid current is with harmonics can be expressed by Fourier series as follows:

[0037] i s ( t ) = I p cos w t + I q sin w t + Σ n ...

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Abstract

The invention discloses a single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current. The single-phase high-accuracy fast cross-feedback decoupling extraction method for harmonic and reactive current is characterized by comprising the following steps that 1, network voltage us<t> and current information is<t> are extracted; 2, is<t> cos wt is passed through a first low-pass filter to obtain a first direct-current component; is<t> sin wt is passed through a second low-pass filter to obtain a second direct-current component; 3, the first direct-current component is feedback-decoupled with is<t> cos wt, and the first direct-current component is cross- decoupled with is<t> sin wt; the second direct-current component is feedback-decoupled with is<t> sin wt, and the first direct-current component is cross-decoupled with is<t> cos wt; 4, the first direct-current component after the cross-feedback decoupling is performed is convolved with cos wt to obtain ip<t>=Ip cos wt; the first direct-current component after the cross-feedback decoupling is performed is convolved with sin wt to obtain iq<t>=Iq sin wt; 5, ip<t> and iq<t> are magnified 2 times through a gain loop to obtain the magnitude of fundamental active current and the magnitude of reactive component current.

Description

technical field [0001] The invention belongs to the technical field of smart grids, and in particular relates to a single-phase high-precision fast cross-feedback decoupling harmonic and reactive current extraction method. Background technique [0002] With the rapid development of power electronics technology, a large number of harmonic currents brought by nonlinear devices such as rectifiers and inverters appear in the power grid. These harmonic currents greatly reduce the power quality of the power grid and bring various hazards to the power grid and power users, such as reducing the operating efficiency of the power grid and affecting the normal operation of electrical equipment such as transformers. In addition, in the new energy micro-grid that has been vigorously promoted in recent years, due to the large number of power electronic devices in the micro-grid and the volatility of distributed energy, the power quality problem of the micro-grid is more prominent. As a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/18Y02E40/30Y02E40/40
Inventor 孙强丁善忠刘文平杜楠吕治国张进水岳宝强
Owner 天津百利机械装备研究院有限公司
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