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A current separation method, device and equipment for a single-phase circuit

A single-phase circuit, current separation technology, applied in voltage/current isolation, measuring device, measuring only current, etc., can solve problems such as limited application range

Active Publication Date: 2021-11-12
PINGDINGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 201510012017.3 proposes a method for separating active and reactive currents, but this method is only suitable for low harmonic environments and has limited application range

Method used

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  • A current separation method, device and equipment for a single-phase circuit
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  • A current separation method, device and equipment for a single-phase circuit

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Embodiment Construction

[0023] The core of the present invention is to provide a current separation method, device and equipment for a single-phase circuit, which will be combined with the following figure 1 The present invention is described in further detail.

[0024] Step 1: Collect the load current i through the current and voltage sampling circuits respectively Lα and grid voltage v Sα ;

[0025] Step 2: According to the set sampling frequency of the ADC module, adopt the first-in-first-out method and combine the transfer characteristics of the data between the arrays, and obtain the i Lα , v Sα i lagged by π / 2 Lβ , v sβ . The specific implementation process is as follows:

[0026] Assume that the sampling values ​​of the current and voltage of the kth time are respectively i Lα (k), v Sα (k),

[0027] i Lα = i Lα (k), i Lβ = i Lα (k-50);

[0028] v Sα =v Sα (k), v Sβ =v Sα (k-50);

[0029] Step 3: Calculate the kth instantaneous active power p(k) by the following formula, p(...

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Abstract

The invention discloses a current separation method, device and equipment for a single-phase circuit. By constructing the current and voltage components that are orthogonal to the single-phase grid current and grid voltage, the instantaneous values ​​of active and reactive power of the single-phase circuit are calculated. According to the principle that the active and reactive currents are determined by the steady-state components of active power and reactive power respectively, on the basis of calculating the steady-state components of active power, the active and reactive currents of the load current are calculated. On the basis of obtaining the sum of active power and reactive power fluctuation components, the harmonic current in grid current is obtained. The separation method proposed by the invention has the advantages of not relying on a phase-locked circuit, and can quickly and accurately separate the active current, reactive current and harmonic current of the single-phase grid current.

Description

technical field [0001] The invention relates to a power system, in particular to a current separation method, device and equipment for a single-phase circuit. Background technique [0002] With the extensive use of more and more single-phase power electronic equipment, such as the use of single-phase rectifier power supply locomotives in electrified railways, the wide application of switching power supplies, and the use of various household appliances such as microwave ovens, televisions and air conditioners, the power grid The harmonic content increases. How to quickly and accurately separate the active, reactive and harmonic currents in the grid current has become an urgent problem to be solved. Patent 201510012017.3 proposes a method for separating active and reactive currents, but this method is only suitable for low harmonic environments and has limited application range. While the widely used i p -i q In the detection method, it is necessary to use a phase-locked l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R19/06G01R15/14
CPCG01R15/146G01R19/0092G01R19/06
Inventor 李杰余亚东田野王帅
Owner PINGDINGSHAN UNIVERSITY