Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance

A technology of grid voltage and rotation vector, applied in the field of power system, can solve the problems of unbalance, inability to accurately detect sub-harmonic current, and interference of detection results by voltage and frequency offset.

Inactive Publication Date: 2015-04-08
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a phase-locked loop-free rotating vector detection (Rotating Vector Detection, RVD) method suitable for grid voltage distortion and unbalance, which solves the problems

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  • Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance
  • Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance
  • Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance

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Embodiment Construction

[0091] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0092] The invention is applicable to the phase-locked loop-free rotating vector detection method (Rotating Vector Detection, RVD) of grid voltage distortion and unbalance, by analyzing the vector characteristics of the grid voltage and current, and then according to the vector characteristics of the grid voltage and current. Respectively represented by a space vector, since the vertical projection of the vector on the symmetrical three-phase coordinate system is the instantaneous value of each phase variable, then as the instantaneous value of each phase variable changes, the corresponding vector also starts to rotate, so the vector contains All the information of grid voltage and current, including steady-state and transient amplitude, phase sequence, harmonics, etc., the instantaneous value expression of the undistorted and symmetrical posi...

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Abstract

The invention discloses a non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance. The method is completed according to the following steps that power grid voltage and load current instantaneous values under the distortion and imbalance state are acquired via voltage Hall components and parts and current Hall components and parts respectively; the power grid voltage and load current instantaneous values processed by a conditioning circuit are converted into digital signals by an A/D module and then inputted to a DSP processor; the digital values of the power grid voltage and load current instantaneous values are processed by the DSP processor so that a specific time of harmonic component is obtained via detection; and reactive and active components are obtained via detection by the DSP processor according to the specific time of harmonic component obtained via detection. According to the non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance, problems in the prior art that the detection process is complex, detection results are interfered by voltage frequency deviation and the specific time of harmonic current cannot be accurately detected are solved.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a phase-locked loop-free rotation vector detection method suitable for grid voltage distortion and imbalance. Background technique [0002] Due to the massive use of nonlinear or unbalanced loads such as motor speed control devices, electric welding machines, and electric arc furnaces in the current power grid, a large amount of reactive power, negative sequence and harmonic currents are absorbed into the power grid, resulting in current and common connection points (Point of Common Coupling (PCC) voltage is distorted or unbalanced, which causes problems related to power quality, such as the reduction of efficiency and power factor of the grid system, the malfunction of electronic equipment, and the reduction of service life. Compensation equipment is usually used to accurately detect the power grid. Power, negative sequence and harmonic components are suppressed to solve the...

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Application Information

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IPC IPC(8): G01R23/165G01R19/25
Inventor 张晓滨张攀段建东张辉杨波伍文俊程思雨
Owner XIAN UNIV OF TECH
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