CN103149436A - Inter-harmonic detection system of three-phase active power distribution network - Google Patents
Inter-harmonic detection system of three-phase active power distribution network Download PDFInfo
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Abstract
The invention discloses an inter-harmonic detection system of a three-phase active power distribution network. The inter-harmonic detection system comprises a three-phase current testing module, a module for transforming three-phase static coordinates to two-phase static coordinates, an inter-harmonic phase-locked loop circuit to be determined, a module for transforming the two-phase static coordinates to two-phase synchronous inter-harmonic frequency rotating coordinates to be determined, a low pass filter, a module for transforming the two-phase synchronous inter-harmonic frequency rotating coordinates to be determined to the two-phase static coordinates, and a module for transforming the two-phase static coordinates to three-phase static coordinates. The inter-harmonic detection system, provided by the invention, is very effective on the inter-harmonic voltage and the inter-harmonic current of a power distribution system. The invention is a system with simple structure, clear conception, and simpler dynamic and static inter-harmonic detection and inter-harmonic cancellation.
Description
Technical field
The present invention relates to a kind of three-phase active power distribution network test detection technique, particularly a kind of distribution system between harmonic detecting system.
Background technology
At present, the three-phase active power distribution network also can claim active little electrical network, but the current transformer that wherein comprises a large amount of feedback powers, these equipment are except producing a large amount of harmonic currents, also have a large amount of between harmonic current, electrical network is formed larger pollution, cause that not only system effectiveness reduces, and also might cause voltage ripple of power network and flickering.Therefore, carry out dynamically to the three-phase active power distribution network between harmonic compensation and eliminate extremely important, the wherein online detection of crucial technology to 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 larger error, reduce effect.The online test method of harmonic current between engineering application at present, the computation process very complicated.
Publication number is 101493482 Chinese invention patent (application number is 200810068451.3), and this invention is a kind of " single-phase harmonic current detecting method " just, can not test the three-phase distribution net, can not test a harmonic wave; And the corresponding tested object of the present invention for " three-phase distribution net " corresponding be three-phase, the object that both were suitable for is completely different; What the present invention tested is a harmonic voltage, electric current, test be the electric weight of different frequency.
Above patented method does not still have to solve the problem of the online test method computation process very complicated of harmonic current between present engineering uses.
Summary of the invention
The present invention be directed to the deficiency of present technology, proposed a kind of comparatively easy three-phase active power distribution network between harmonic detecting system, this system can solve the problem of the online detection of the middle harmonic current of active 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 used in the present invention is:
Harmonic detecting system between a kind of three-phase active power distribution network, described system comprises:
Three-phase current test module, this module are tested electric current to be detected and are obtained three-phase current signal i
a, i
b, i
cPerhaps voltage signal, and this test result is passed to the three phase static coordinate to two-phase static coordinate conversion module;
The three phase static coordinate is to two-phase static coordinate conversion module, and this module receives the signal of three-phase current test module, and to described three-phase current signal i
a, i
b, i
cCarry out conversion, namely transform to two-phase static coordinate signal i from the three phase static coordinate signal
α, i
β, and the signal that this conversion obtains is passed to the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation module of two synchronised;
The two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation module of two synchronised, and this module receives two-phase static coordinate signal i
α, i
βAfter, further this signal is carried out conversion, it is transformed to be measured harmonic frequency rotational coordinates signal i of two synchronised from two-phase static coordinate signal
d, i
q, and the result that conversion obtains is passed to low-pass filter;
To be measured Harmonic phase locking loop circuit control the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation module of two synchronised, to be measured harmonic frequency rotational coordinates of two synchronised to two-phase static coordinate conversion module the phase-locking when the signal conversion;
Low-pass filter is respectively to described rotational coordinates signal i
d, i
qCarry out filtering, obtain the DC component signal
This DC component signal
Output to be measured harmonic frequency rotational coordinates of two synchronised to two-phase static coordinate conversion module;
To be measured harmonic frequency rotational coordinates of two synchronised is to two-phase static coordinate conversion module, and this module is with described DC component signal
Transform to two-phase static coordinate signal to be measured harmonic frequency rotational coordinates signal of two synchronised, and result is outputed to the two-phase static coordinate to three phase static transformation of coordinates module;
The two-phase static coordinate is to three phase static transformation of coordinates module, this module proceeds to the conversion of three phase static coordinate signal to be measured harmonic frequency rotational coordinates of two synchronised to the two-phase static coordinate signal that two-phase static coordinate conversion module obtains, and obtains to be measured harmonic current i in three-phase current
af, i
bf, i
cf
Preferably, described two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation module of two synchronised, and concrete transform method is:
Preferably, described two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation module of two synchronised, the measuring current space vector is converted on synchronous to be measured harmonic frequency rotational coordinates dq at the component on two-phase static coordinate α β, turning to of synchronous to be measured harmonic frequency rotating coordinate system dq is identical with to be measured harmonic frequency phase sequence, and synchronous rotational speed is to be measured the corresponding synchronous rotational speed of harmonic frequency.
Preferably, described three-phase current test module adopts and measures three-phase current signal i by current sensor
a, i
b, i
c
Beneficial effect of the present invention is: the present invention is a kind of to be measured harmonic current detection system in the three-phase distribution net of source that contain, and the curtage of testing is carried out synchronous to be measured harmonic frequency rotating coordinate transformation.Therefore, system architecture of the present invention is simple, and operand is few, is specially adapted to contain harmonic technology between source three-phase distribution net power distribution network online.
Description of drawings
Fig. 1 is one embodiment of the invention systematic schematic diagram;
Fig. 2 is one embodiment of the invention job step process flow diagram.
Embodiment
The technical solution of the present invention is further explained below in conjunction with drawings and Examples, but following content is not intended to limit the scope of the invention.
As shown in Figure 1, systematic schematic diagram for one embodiment of the invention, described system comprises three-phase current test module 1, the three phase static coordinate is to two-phase static coordinate conversion module 2, to be measured Harmonic phase locking loop circuit 3, the two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation module 4 of two synchronised, low-pass filter 5 and 6, to be measured harmonic frequency rotational coordinates of two synchronised is to two-phase static coordinate conversion module 7, and the two-phase static coordinate is to three phase static transformation of coordinates module 8.
As shown in Figure 2, be the present embodiment system works flow chart of steps, be specially:
The first step: three-phase current test module 1 measures three-phase current i from electrical network
a, i
b, i
c, and this result is outputed to the three phase static coordinate to two-phase static coordinate conversion module 2.
Containing source three-phase distribution net three-phase current by simple signals collecting is:
In formula, i
a, i
b, i
cBe the three-phase current of power distribution network, n is any greater than zero non-positive integer; i
a, i
b, i
cCan be measured by current sensor.
Second step: the three-phase current i that the three phase static coordinate obtains three-phase current test module 1 to two-phase static coordinate conversion module 2
a, i
b, i
cCarrying out the three phase static coordinate is abc → α β conversion to the conversion of two-phase static coordinate, obtains two-phase static coordinate signal i
α, i
βAnd this result is outputed to the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation module 4 of two synchronised.
Described three phase static coordinate is as follows to two-phase static coordinate conversion module 2 conversion processes:
In this module, synchronous to be measured harmonic frequency rotating coordinate transformation is that the measuring current space vector is converted on synchronous to be measured harmonic frequency rotational coordinates dq at the component on the static α β of two-phase.Wherein
And n=f/50.Synchronous to be measured harmonic frequency rotating coordinate system dq, it turns to identical with to be measured harmonic frequency phase sequence, and synchronous rotational speed is to be measured the corresponding synchronous rotational speed of harmonic frequency.Have according to the General Transformations relation:
Dq → α β transform method is:
The transform method of α β → dq is:
The transformation matrix of its α β → dq
Be the direct transform matrix, dq → α β transformation matrix
Be inverse-transform matrix.
The 3rd the step: the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation module 4 of two synchronised with the two-phase static coordinate signal i that obtains
α, i
βCarry out synchronous to be measured harmonic frequency rotational coordinates α β → dq conversion, obtain rotational coordinates i
d, i
q, and result is outputed to low-pass filter 5 and 6.
Described two-phase static coordinate in to be measured harmonic frequency rotating coordinate transformation module 4 of two synchronised, biphase current component i
α, i
βBe transformed to rotational coordinates i
d, i
q, process is:
In formula,
N is any greater than zero non-integer.
The 4th step: low-pass filter 5 and 6 is with described rotational coordinates i
d, i
qFiltering obtains DC component respectively
And with this DC component
Output to be measured harmonic frequency rotational coordinates of two synchronised to two-phase static coordinate conversion module 7.
The 5th step: to be measured harmonic frequency rotational coordinates of two synchronised arrives two-phase static coordinate conversion module 7 with described DC component signal
Transform to two-phase static coordinate signal to be measured harmonic frequency rotational coordinates signal of two synchronised, and result is outputed to the two-phase static coordinate to three phase static transformation of coordinates module 8.The two-phase static coordinate proceeds to the conversion of three phase static coordinate signal to be measured harmonic frequency rotational coordinates of 8 pairs of two synchronised of three phase static transformation of coordinates module to the two-phase static coordinate signal that two-phase static coordinate conversion module 7 obtains, and obtains to be measured harmonic current i in three-phase current
af, i
bf, i
cf
In the present embodiment, to be measured harmonic frequency rotational coordinates of two synchronised be to two-phase static coordinate conversion module 7, two-phase static coordinate to three phase static transformation of coordinates module 8, complete with
Carry out dq → α β → abc coordinate transform and obtain to be measured harmonic current i in three-phase current
af, i
bf, i
cf
In the present embodiment, to be measured Harmonic phase locking loop circuit 3 is used for completing the two-phase static coordinate to two the automatic controls that to be measured harmonic wave electrical signal phase is synchronous during to 7 work of two-phase static coordinate conversion module of to be measured harmonic frequency rotating coordinate transformation module 4 of two synchronised and to be measured harmonic frequency rotational coordinates of two synchronised.
In the present embodiment, all can adopt hardware to realize with upper-part or module, wherein: three-phase current test module 1 can adopt current sensor, also can adopt existing current testing circuit to realize.Each coordinate transformation module can adopt the logic combination circuit of realizing above-mentioned corresponding function, also can adopt single-chip microcomputer, and is more excellent, adopts the Programmable Logic Device chip.
The present embodiment is based on to be measured harmonic synchronous Rotating Transition of Coordinate and low-pass filtering sampling, carry out again inverse transformation, this system to contain source three-phase distribution net between harmonic voltage, electric current online detect very effective, simple in structure, be the comparatively easy system that dynamic and static harmonic wave detects and a harmonic wave is eliminated.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (3)
- A three-phase active power distribution network between harmonic detecting system, it is characterized in that, described system comprises:Three-phase current test module (1), this module is tested electric current to be detected, obtains three-phase current signal i a, i b, i c, and this test result is passed to the three phase static coordinate to two-phase static coordinate conversion module (2);The three phase static coordinate receives the signal of three-phase current test module (1) to two-phase static coordinate conversion module (2), and to described three-phase current signal i a, i b, i cCarry out conversion, the three phase static coordinate signal is transformed to two-phase static coordinate signal i α, i β, and the signal that this conversion obtains is passed to the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation modules of two synchronised (4);To be measured Harmonic phase locking loop circuit (3), control the two-phase static coordinate to be measured harmonic frequency rotating coordinate transformation modules of two synchronised (4), to be measured harmonic frequency rotational coordinates of two synchronised to two-phase static coordinate conversion module (7) phase-locking when the signal conversion.The two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation modules of two synchronised (4), and this module receives two-phase static coordinate signal i α, i βAfter, further this signal is carried out conversion, it is transformed to be measured harmonic frequency rotational coordinates signal i of two synchronised from two-phase static coordinate signal d, i q, and the result that conversion obtains is passed to low-pass filter (5) and (6);Low-pass filter (5) and (6), two low-pass filters (5) and (6) are respectively to described rotational coordinates signal i d, i qCarry out filtering, obtain the DC component signalThis DC component signal
Output to be measured harmonic frequency rotational coordinates of two synchronised to two-phase static coordinate conversion module (7);
To be measured harmonic frequency rotational coordinates of two synchronised is to two-phase static coordinate conversion module (7), and this module is with described DC component signalTransform to two-phase static coordinate signal to be measured harmonic frequency rotational coordinates signal of two synchronised, and result is outputed to the two-phase static coordinate to three phase static transformation of coordinates module (8);
The two-phase static coordinate is to three phase static transformation of coordinates module (8), this module proceeds to the conversion of three phase static coordinate signal to be measured harmonic frequency rotational coordinates of two synchronised to the two-phase static coordinate signal that two-phase static coordinate conversion module (7) obtains, and obtains to be measured harmonic current i in three-phase current af, i bf, i cf - Three-phase active power distribution network according to claim 1 between harmonic detecting system, it is characterized in that, described two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation modules of two synchronised (4), concrete transform method is:
N be between overtone order, for greater than zero non-integer.
- Three-phase active power distribution network according to claim 1 and 2 between harmonic detecting system, it is characterized in that, described two-phase static coordinate is to be measured harmonic frequency rotating coordinate transformation modules of two synchronised (4), that the measuring current space vector is converted on synchronous to be measured harmonic frequency rotational coordinates dq at the component on two-phase static coordinate α β, turning to of synchronous to be measured harmonic frequency rotating coordinate system dq is identical with to be measured harmonic frequency phase sequence, and synchronous rotational speed is to be measured the corresponding synchronous rotational speed of harmonic frequency.
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Cited By (5)
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| CN103364618A (en) * | 2013-07-26 | 2013-10-23 | 武汉大学 | Measuring method for harmonic voltage on direct current side of high-voltage direct current power transmission system |
| CN103474994A (en) * | 2013-07-30 | 2013-12-25 | 华北电力大学 | DC-side voltage control device and method for multiterminal uniform electric-energy quality controller |
| CN104181390A (en) * | 2014-08-18 | 2014-12-03 | 信元瑞电气有限公司 | Harmonic detection method based on zero-sequence current separation of three-phase four-wire system |
| CN104502705A (en) * | 2014-12-04 | 2015-04-08 | 西安理工大学 | Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance |
| CN113938073A (en) * | 2021-10-09 | 2022-01-14 | 广东汇天航空航天科技有限公司 | Motor position estimation method and device, controller, electric automobile and aerocar |
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| CN102221639A (en) * | 2011-04-06 | 2011-10-19 | 国电南瑞科技股份有限公司 | Positive and negative sequence current real-time detection method |
| CN102590646A (en) * | 2012-02-15 | 2012-07-18 | 上海大学 | Method for detecting positive sequence, negative sequence and harmonic current based on phase sequence filter |
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Patent Citations (3)
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| CN101893651A (en) * | 2010-06-18 | 2010-11-24 | 上海理工大学 | Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system |
| CN102221639A (en) * | 2011-04-06 | 2011-10-19 | 国电南瑞科技股份有限公司 | Positive and negative sequence current real-time detection method |
| CN102590646A (en) * | 2012-02-15 | 2012-07-18 | 上海大学 | Method for detecting positive sequence, negative sequence and harmonic current based on phase sequence filter |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364618A (en) * | 2013-07-26 | 2013-10-23 | 武汉大学 | Measuring method for harmonic voltage on direct current side of high-voltage direct current power transmission system |
| CN103364618B (en) * | 2013-07-26 | 2015-10-28 | 武汉大学 | A kind of HVDC (High Voltage Direct Current) transmission system DC side harmonics voltage measurement method |
| CN103474994A (en) * | 2013-07-30 | 2013-12-25 | 华北电力大学 | DC-side voltage control device and method for multiterminal uniform electric-energy quality controller |
| CN103474994B (en) * | 2013-07-30 | 2015-08-26 | 华北电力大学 | Multiterminal Unified Power Quality Controller DC voltage control device and method |
| CN104181390A (en) * | 2014-08-18 | 2014-12-03 | 信元瑞电气有限公司 | Harmonic detection method based on zero-sequence current separation of three-phase four-wire system |
| CN104502705A (en) * | 2014-12-04 | 2015-04-08 | 西安理工大学 | Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance |
| CN104502705B (en) * | 2014-12-04 | 2017-09-29 | 西安理工大学 | Suitable for line voltage distortion and unbalanced no phase-locked loop rotating vector detection method |
| CN113938073A (en) * | 2021-10-09 | 2022-01-14 | 广东汇天航空航天科技有限公司 | Motor position estimation method and device, controller, electric automobile and aerocar |
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