CN203149014U - Inter-harmonic wave detection apparatus for electric power distribution system - Google Patents

Inter-harmonic wave detection apparatus for electric power distribution system Download PDF

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Publication number
CN203149014U
CN203149014U CN 201320090817 CN201320090817U CN203149014U CN 203149014 U CN203149014 U CN 203149014U CN 201320090817 CN201320090817 CN 201320090817 CN 201320090817 U CN201320090817 U CN 201320090817U CN 203149014 U CN203149014 U CN 203149014U
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China
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phase
module
signal
static coordinate
phase static
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CN 201320090817
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Inventor
吴建国
杨文焕
李荣高
钱侃
邵建军
王健林
徐长贵
刘永平
张宇
陈海需
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TONGSHENG ELECTRICITY POWER Co Ltd
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TONGSHENG ELECTRICITY POWER Co Ltd
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Abstract

The utility model discloses an inter-harmonic wave detection apparatus for an electric power distribution system. The apparatus comprises a three phase current signal acquisition module, a signal processing module, and an output display module, wherein three phase stationary coordinate to two phase stationary coordinate transformation processing operation, two phase stationary coordinate to two phase synchronous inter-harmonic wave frequency rotation coordinate transformation processing operation, low pass filtering processing operation, two phase synchronous inter-harmonic wave frequency rotation coordinate to two phase stationary coordinate transformation processing operation and two phase stationary coordinate to three phase stationary coordinate transformation processing operation are orderly performed on three phase current signals by the signal processing module. The inter-harmonic wave detection apparatus for an electric power distribution system is highly effective in detection of inter-harmonic wave voltage and currents of the electric power distribution system. The inter-harmonic wave detection apparatus for an electric power distribution system is characterized by simple structure, clear concept, and simple moving and stationary inter-harmonic wave detection and simple elimination of inter-harmonic waves.

Description

Harmonic wave pick-up unit between distribution system
Technical field
The utility model relates to a kind of power distribution network test detection technique, particularly a kind of distribution system between the harmonic wave pick-up unit.
Background technology
At present, comprise the current transformer that can feed back electric energy in a large number in little electrical network, these equipment are except producing a large amount of harmonic currents, also have a large amount of between harmonic current, electrical network is formed bigger pollution, cause that not only system effectiveness reduces, also change to cause voltage ripple of power network and flickering.Therefore, carry out dynamically to little electrical network between harmonic compensation and eliminate extremely importantly, wherein Guan Jian technology is to the online detection of harmonic current between system.On-line testing and the existing proven technique of elimination for harmonic current.But use existing harmonic current method of testing can reveal a large amount of between harmonic components, cause than mistake, reduce effect.The online detection of harmonic current between engineering application at present, the computation process very complicated.
Publication number is the Chinese utility model patent (application number is 200920350431.5) of 201583584U, this utility model relates to a kind of harmonic current detection filter device of Active Power Filter-APF, this device comprises: two-phase coordinate system transformation module, and being used for the threephase load current transformation is two phase coordinate systems; Low-pass filtering module; Three-phase coordinate system transformation module, being used for the fundametal compoment current transformation after low-pass filtering module is handled is the fundametal compoment electric current of the threephase load electric current under three phase coordinate systems; The PWM generation module; Subtracter is used for the fundametal compoment current subtraction with threephase load electric current and the output of three-phase coordinate system transformation module, obtains the harmonic signal electric current.But the apparatus structure of this patent can't be for the online detection of harmonic current between present power distribution network testing engineering.
The utility model content
The utility model is the deficiency at present technology, proposed a kind of comparatively easy distribution system between the harmonic wave pick-up unit, this system can solve the problem of the online detection of the middle harmonic current of little electrical network, can be used for dynamic and static harmonic wave test and a harmonic compensation.
For achieving the above object, the technical solution adopted in the utility model is:
Harmonic wave pick-up unit between a kind of distribution system, described device comprises: three-phase current signal acquisition module, signal processing module and output display module, described three-phase current signal acquisition module output terminal connects described signal processing module input end, described signal processing module output terminal is connected to described output display module, wherein:
Described three-phase current signal acquisition module is gathered the three-phase current signal of electric current to be measured, and this signal is outputed to described signal processing module;
Described signal processing module to the described three-phase current signal of input carry out successively the three phase static coordinate to two-phase static coordinate conversion process, two-phase static coordinate between two synchronised between the processing of harmonic frequency rotating coordinate transformation, low-pass filtering treatment, two synchronised the harmonic frequency rotational coordinates to two-phase static coordinate conversion process and two-phase static coordinate to the three phase static coordinate transform processing;
Described output display module is exported demonstration with the result of described signal processing module.
Preferably, described signal processing module comprises:
The first two-phase static coordinate conversion module is used for three-phase current signal acquisition module gained three-phase current signal from the three phase static coordinate transform to the two-phase static coordinate, and the result is outputed to the rotating coordinate transformation module;
Phase-locked loop circuit is used for control rotating coordinate transformation module, the phase-locking of the second two-phase static coordinate conversion module when the signal conversion;
The rotating coordinate transformation module is used for the output signal of the first two-phase static coordinate conversion module is transformed to harmonic frequency rotational coordinates signal between two synchronised, and the result that conversion obtains is outputed to two low-pass filters;
Two low-pass filters are used for harmonic frequency rotational coordinates signal between described two synchronised is carried out filtering, obtain the DC component signal, and this signal is outputed to the second two-phase static coordinate conversion module;
The second two-phase static coordinate conversion module is used for the DC component signal that obtains is transformed to two-phase static coordinate signal, and the result is outputed to the three phase static coordinate transformation module;
The three phase static coordinate transformation module, the signal that is used for the second two-phase static coordinate conversion module is obtained transforms to the three phase static coordinate signal, obtain in the three-phase current between harmonic current.
Preferably, described three-phase current signal acquisition module is current sensor or signal acquisition circuit.
Preferably, described signal processing module is the Programmable Logic Device chip.
The beneficial effects of the utility model are: the utility model is harmonic current detection system in the middle of a kind of power distribution network, carry out synchronously to the electric current of testing between the harmonic frequency rotating coordinate transformation.Therefore, the utility model system architecture is simple, and operand is few, is specially adapted to online harmonic technology of power distribution network.
Description of drawings
Fig. 1 is the utility model one embodiment device structured flowchart.
Among the figure: three-phase current signal acquisition module 1, the first two-phase static coordinate conversion module 2, phase-locked loop circuit 3, rotating coordinate transformation module 4, low-pass filter 5 and 6, the second two-phase static coordinate conversion module 7, three phase static coordinate transformation module 8, output display module 9.
Embodiment
Below in conjunction with drawings and Examples the technical solution of the utility model is further explained, but following content is not used in restriction protection domain of the present utility model.
As shown in Figure 1, apparatus structure block diagram for the utility model one embodiment, described device comprises: three-phase current signal acquisition module 1, signal processing module and output display module 9, described three-phase current signal acquisition module 1 output terminal connects described signal processing module input end, described signal processing module output terminal is connected to described output display module 9, wherein:
Described three-phase current signal acquisition module 1 is gathered the three-phase current signal of electric current to be measured, and this signal is outputed to described signal processing module;
Described signal processing module to the described three-phase current signal of input carry out successively the three phase static coordinate to two-phase static coordinate conversion process, two-phase static coordinate between two synchronised between the processing of harmonic frequency rotating coordinate transformation, low-pass filtering treatment, two synchronised the harmonic frequency rotational coordinates to two-phase static coordinate conversion process and two-phase static coordinate to the three phase static coordinate transform processing;
Described output display module 9 is exported demonstration with the result of described signal processing module.
In the present embodiment, described signal processing module comprises:
The first two-phase static coordinate conversion module 2 is used for three-phase current signal acquisition module 1 gained three-phase current signal from the three phase static coordinate transform to the two-phase static coordinate, and the result is outputed to rotating coordinate transformation module 4;
Phase-locked loop circuit 3 is used for control rotating coordinate transformation module 4, the phase-locking of the second two-phase static coordinate conversion module 7 when the signal conversion;
Rotating coordinate transformation module 4 is used for the output signal of the first two-phase static coordinate conversion module 2 is transformed to harmonic frequency rotational coordinates signal between two synchronised, and the result that conversion obtains is outputed to two low-pass filters;
Two low-pass filters 5 and 6 are used for harmonic frequency rotational coordinates signal between described two synchronised is carried out filtering, obtain the DC component signal, and this signal is outputed to the second two-phase static coordinate conversion module 7;
The second two-phase static coordinate conversion module 7 is used for the DC component signal that obtains is transformed to two-phase static coordinate signal, and the result is outputed to three phase static coordinate transformation module 8;
Three phase static coordinate transformation module 8, the signal that is used for the second two-phase static coordinate conversion module 7 is obtained transforms to the three phase static coordinate signal, obtain in the three-phase current between harmonic current.
In the present embodiment, described two-phase static coordinate is to harmonic frequency rotating coordinate transformation module between two synchronised.Module adopts the matrixing mode to carry out.
In the present embodiment, described rotating coordinate transformation module, with the measuring current space vector between the component on the two-phase static coordinate α β is converted synchronously on the harmonic frequency rotational coordinates dq, synchronously harmonic frequency rotating coordinate system dq turn to identical with a harmonic frequency phase sequence, synchronous rotational speed be between the corresponding synchronous rotational speed of harmonic frequency.
In the utility model, all can adopt hardware to realize that wherein: the three-phase current signal acquisition module can adopt current sensor with upper-part or module, also can adopt existing signal acquisition circuit to realize.Signal processing module can adopt the logic combination circuit of realizing above-mentioned functions, also can adopt single-chip microcomputer, and is more excellent, adopts the Programmable Logic Device chip.The output display module can be general display, also can be other visualization devices.
The said apparatus that present embodiment provides is very effective, simple in structure to harmonic voltage between distribution system, the online detection of electric current by nextport hardware component NextPort, is the comparatively easy device that dynamic and static harmonic wave detects and a harmonic wave is eliminated.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.

Claims (4)

  1. A distribution system between the harmonic wave pick-up unit, it is characterized in that, described device comprises: three-phase current signal acquisition module (1), signal processing module and output display module (9), described three-phase current signal acquisition module (1) output terminal connects described signal processing module input end, described signal processing module output terminal is connected to described output display module (9), wherein:
    Described three-phase current signal acquisition module (1) is gathered the three-phase current signal of electric current to be measured, and this signal is outputed to described signal processing module;
    Described signal processing module to described three-phase current signal carry out successively the three phase static coordinate to two-phase static coordinate conversion process, two-phase static coordinate between two synchronised between the processing of harmonic frequency rotating coordinate transformation, low-pass filtering treatment, two synchronised the harmonic frequency rotational coordinates to two-phase static coordinate conversion process and two-phase static coordinate to the three phase static coordinate transform processing;
    Described output display module (9) is exported demonstration with the result of described signal processing module.
  2. Distribution system according to claim 1 between the harmonic wave pick-up unit, it is characterized in that described signal processing module comprises:
    The first two-phase static coordinate conversion module (2) is used for three-phase current signal acquisition module (1) gained three-phase current signal from the three phase static coordinate transform to the two-phase static coordinate, and the result is outputed to rotating coordinate transformation module (4);
    Phase-locked loop circuit (3) is used for control rotating coordinate transformation module (4), the phase-locking of the second two-phase static coordinate conversion module (7) when the signal conversion;
    Rotating coordinate transformation module (4) is used for the output signal of the first two-phase static coordinate conversion module (2) is transformed to harmonic frequency rotational coordinates signal between two synchronised, and the result that conversion obtains is outputed to low-pass filter;
    Two low-pass filters (5,6) are used for harmonic frequency rotational coordinates signal between described two synchronised is carried out filtering, obtain the DC component signal, and this signal is outputed to the second two-phase static coordinate conversion module (7);
    The second two-phase static coordinate conversion module (7) is used for the DC component signal that obtains is transformed to two-phase static coordinate signal, and the result is outputed to three phase static coordinate transformation module (8);
    Three phase static coordinate transformation module (8), the signal that is used for the second two-phase static coordinate conversion module (7) is obtained transforms to the three phase static coordinate signal, obtain in the three-phase current between harmonic current.
  3. 3. according to harmonic wave pick-up unit between each described distribution system of claim 1-2, it is characterized in that described three-phase current signal acquisition module (1) is current sensor or signal acquisition circuit.
  4. 4. according to harmonic wave pick-up unit between each described distribution system of claim 1-2, it is characterized in that described signal processing module is the Programmable Logic Device chip.
CN 201320090817 2013-02-28 2013-02-28 Inter-harmonic wave detection apparatus for electric power distribution system Expired - Lifetime CN203149014U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104076203A (en) * 2014-07-07 2014-10-01 国家电网公司 Ultralow-frequency inter-harmonic detection method with negative frequency influence considered

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104076203A (en) * 2014-07-07 2014-10-01 国家电网公司 Ultralow-frequency inter-harmonic detection method with negative frequency influence considered

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Granted publication date: 20130821