CN103091554A - Steady-state harmonic wave analyzing method for line terminal synchronous measurement signal multi-bus micro-grid - Google Patents
Steady-state harmonic wave analyzing method for line terminal synchronous measurement signal multi-bus micro-grid Download PDFInfo
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- CN103091554A CN103091554A CN2013100661781A CN201310066178A CN103091554A CN 103091554 A CN103091554 A CN 103091554A CN 2013100661781 A CN2013100661781 A CN 2013100661781A CN 201310066178 A CN201310066178 A CN 201310066178A CN 103091554 A CN103091554 A CN 103091554A
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Abstract
The invention relates to a steady-state harmonic wave analyzing method for a line terminal synchronous measurement signal multi-bus micro-grid. The fact of additionally installing detecting devices on all buses of the micro-grid is avoided and a large amount of investment is saved. The steady-state harmonic wave analyzing method comprises the steps of collecting voltage and current synchronous signals of a micro-grid line terminal detecting point and obtaining line impedance information between the detecting point and a bus adjacent to the detecting point; according to obtained amplitude and initial phase of the voltage and current synchronous signals and by combining the impedance information between the line terminal detecting point and the bus adjacent to the line terminal detecting point, calculating the voltage phasor of the bus adjacent to the line terminal detecting point by the utilization of the Kirchhoff law; by combining voltage phasors of two adjacent buses and line impedance information between the buses, calculating the current phasor in a bus connecting line according to the Ohm law; by combining the voltage and current phasors of all the buses, obtaining effective values of fundamental waves and all sub-harmonic waves and calculating the harmonic wave situations of all the buses by the utilization of the calculation formula of harmonic wave voltage ratio, harmonic wave current ratio, voltage harmonic wave total distortion rate, and current harmonic wave total distortion rate.
Description
Technical field
The present invention relates to a kind of little Power System Steady-state harmonic analysis method, particularly the little Power System Steady-state harmonic analysis method of the many buses of line end synchro measure signal.
Background technology
Little electrical network is as the part of large electrical network, and its voltage and current that provides should be the simple alternating current amount that contains few harmonic wave in the ideal case.Yet, along with the increase of consumer of using and contain the nonlinear material of electric arc and ferromagnetic material etc. of the various fairings, large-capacity transducer, large-scale ac-dc conversion device and other the power electronic equipment that contain the non-linear electric component such as semiconductor, a large amount of harmonic waves injects electrical network.The generation of harmonic wave is a kind of pollution to the quality of power supply of little electrical network, has reduced power supply quality, simultaneously safe, the stable and economical operation of the large electrical network that is connected is brought harm.Harmonic wave makes the electrical equipment in little electrical network produce extra harmonic loss, has reduced the efficient of electrical energy production, transmission and utilization; The normal operation of the various electrical equipments of harmonic effects makes easily that its generation is overheated, the phenomenons such as vibration and noise, and makes insulation ag(e)ing, shortens serviceable life, even breaks down or damages; Harmonic wave can cause little electrical network and the local parallel resonance of large electrical network or series resonance, and harmonic content is amplified, and causes the equipment burnouts such as capacitor, even causes major accident; Harmonic wave also can cause relay protection aut.eq. malfunction relevant with it or tripping, makes its action lose selectivity, causes reliability to reduce, and even causes systematic failures, the safe operation of serious threat electric system; Harmonic wave makes the electric measurement result larger error occur, and power supply department can't correctly measure each user's electricity consumption situation, causes electric energy metrical chaotic; For communication facilities and the electronic equipment of electric system outside, harmonic wave can produce interference, even in the situation that extreme, and the safety that also can threaten communication facilities and personnel.
Therefore, little electric harmonic analysis is particularly important for the normal operation of little electrical network.Measure fast and accurately and analyze the harmonic wave in little electrical network, can grasp exactly little mains by harmonics situation, for the judgement of power supply department or power consumer with improve the quality of power supply foundation is provided, be convenient to the automatic adjusting of little operation of power networks state, be conducive to ensure safe, stable, the efficient operation of little electrical network.
Chinese scholars has been done large quantity research for frequency analysis.Mainly contain frequency domain analysis, be temporal analysis and Time-Frequency Analysis method.Existing little mains by harmonics method is only to pay close attention to the harmonic wave situation at little electrical network and large system's points of common connection place, existing little electric harmonic analysis method need to install and measure at the points of common connection place device to obtain the voltage and current signal of points of common connection, uses the harmonic wave situation of this voltage and current signal analysis points of common connection., analyzes the harmonic wave situation of little electrical network and large system's points of common connection and interior each classification bus of little electrical network and the improvement of harmonic wave more and more is subject to people's attention for the raising that the quality of power supply requires along with power consumer in the injection of a large amount of harmonic waves in little electrical network and little electrical network.The harmonic distortion situation of measuring each bus in little electrical network is the important prerequisite of harmonic wave control, and existing harmonic analysis method need to be at the voltage and current signal of measuring each bus.Need additionally to install and measure device to record the voltage and current signal of each bus for this reason on each bus, for existing harmonic analysis method provides computational data, greatly increased equipment investment.
Summary of the invention
Purpose of the present invention overcomes the above problems exactly, provides a kind of based on the little Power System Steady-state harmonic analysis method of the many buses of line end synchro measure signal.Distributed power source is positioned at line end in existing little electrical network, for better controlling distributed power source output, at its interface that is incorporated into the power networks, measurement mechanism has been installed, and can realize the synchro measure of the voltage and current signal of line end by the high precision time dissemination system.The voltage and current signal that measures can carry out communication by energy management system.The present invention is take line end voltage and current synchro measure data as reference, calculate the each harmonic parameter according to fast Fourier analysis method or wavelet transformation, in conjunction with little electrical network network equation, but the harmonic wave situation of little each bus of electrical network of many buses under energy management system indirect calculation stable situation.The present invention utilizes the measurement data of existing line end to carry out frequency analysis, has avoided at each bus of little electrical network, the additional detections device being installed, and has saved great amount of investment.
For realizing above purpose, the present invention adopts following technical scheme:
Based on the little Power System Steady-state harmonic analysis method of many buses of line end synchro measure signal, comprise the following steps:
The little Power System Steady-state harmonic analysis method of the many buses of a kind of line end synchro measure signal, its step is:
Step 1 gathers the voltage and current synchronizing signal of little power network line end point detection point, and obtains check point and be adjacent line impedance information between bus;
Step 2 is adjacent the line impedance information between bus according to the amplitude that obtains the voltage and current synchronizing signal, initial phase combined circuit end point detection point, utilizes the voltage phasor of the adjacent bus of Kirchhoff's law computational scheme end point detection point;
Step 3 in conjunction with line impedance information between the voltage phasor of two adjacent buses and bus, utilizes Ohm law to calculate electric current phasor in the bus connecting line;
Step 4 in conjunction with each busbar voltage and electric current phasor, obtains first-harmonic and each harmonic effective value, utilizes harmonic voltage containing rate, harmonic current containing ratio, total harmonic distortion and current harmonics resultant distortion rate computing formula to calculate each bus harmonic wave situation.
In described step 1, use the first-harmonic of FFT decomposition computation each point, amplitude and the initial phase of each harmonic voltage and current.
Beneficial effect of the present invention: the present invention adopts the little mains by harmonics situation of line end synchro measure signal indirect calculation, not only can grasp the harmonic wave situation of each bus in little electrical network, for little power network harmonic wave management provides important evidence, also avoid installing on each bus the extra measuring equipment monitoring quality of power supply in little electrical network, saved great amount of investment.
Description of drawings
Fig. 1 is the little electrical network basic block diagram of many buses.
Embodiment
The below further sets forth the technical scheme that adopts with reference to the accompanying drawings.
As shown in Figure 1, distributed electrical source current I
S1And I
S2Be positioned at little power network line end power supply, existing little electrical network is at its S of place that is incorporated into the power networks
1Point and S
2Point has all been installed measurement mechanism, and the S of place can obtain being incorporated into the power networks
1Point and S
2The voltage and current synchronizing signal of point uses FFT decomposition method or Wavelet Transformation Algorithm to calculate the first-harmonic of each point, amplitude and the initial phase of each harmonic voltage and current;
In conjunction with S
1Amplitude and initial phase and the S of the voltage and current of point
1Point bus B adjacent with it
1Between line impedance Z
1, use Kirchhoff's law to calculate and S
1The adjacent bus B of point
1Voltage phasor; In conjunction with S
2Amplitude and initial phase and the S of the voltage and current of point
2Point bus B adjacent with it
2Between line impedance Z
3, use Kirchhoff's law to calculate and S
2The adjacent bus B of point
2Voltage phasor;
Due in conjunction with two adjacent bus B
1And B
2Voltage phasor and bus between line impedance Z
2, use Ohm law to calculate electric current phasor in the bus connecting line.
The voltage of bus B1, the B2 that obtains from above-mentioned calculating and flow through the electric current phasor of bus connection line, therefrom can obtain first-harmonic and the each harmonic effective value of each voltage, electric current, use harmonic voltage containing rate, harmonic current containing ratio, total harmonic distortion and current harmonics resultant distortion rate computing formula to calculate each bus harmonic wave situation.The present invention uses Matlab software to carry out emulation in conjunction with Fig. 1, because harmonic wave in little electrical network is mainly odd harmonic, calculate for simplifying, this emulation is only considered 13 times and following odd harmonic, and because the reason of transformer can not considered 3 integer multiple subharmonic, simulation result and this method result of calculation see Table 1, table 2 and table 3.
Table 1 bus 2 place's harmonic voltage situation calculated values and simulation value contrast
| Classification | Calculated value (%) | Simulation value (%) |
| HRU 5 | 12.94 | 12.95 |
| HRU 7 | 6.97 | 698 |
| HRU 11 | 0.96 | 0.96 |
| HRU 13 | 0.77 | 0.77 |
| THD u | 14.75 | 14.76 |
Table 2 bus 1 place's harmonic wave situation calculated value and simulation value contrast
| Classification | Calculated value (%) | Simulation value (%) |
| HRU 5 | 1104 | 1104 |
| HRU 7 | 5.67 | 5.67 |
| HRU 11 | 184 | 184 |
| HRU 13 | 112 | 112 |
| THD u | 12.59 | 12.60 |
Table 3 bus 1 place's harmonic current situation calculated value and simulation value contrast
| Classification | Calculated value (%) | Simulation value (%) |
| HRI 5 | 39.44 | 39.55 |
| HRI 7 | 19.14 | 19.20 |
| HRI 11 | 9.92 | 9.93 |
| HRI 13 | 4.82 | 4.83 |
| THD i | 45.20 | 45.33 |
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. the little Power System Steady-state harmonic analysis method of the many buses of line end synchro measure signal, is characterized in that, its step is:
Step 1 gathers the voltage and current synchronizing signal of little power network line end point detection point, and obtains check point and be adjacent line impedance information between bus;
Step 2 is adjacent the line impedance information between bus according to the amplitude that obtains the voltage and current synchronizing signal, initial phase combined circuit end point detection point, utilizes the voltage phasor of the adjacent bus of Kirchhoff's law computational scheme end point detection point;
Step 3 in conjunction with line impedance information between the voltage phasor of two adjacent buses and bus, utilizes Ohm law to calculate electric current phasor in the bus connecting line;
Step 4 in conjunction with each busbar voltage and electric current phasor, obtains first-harmonic and each harmonic effective value, utilizes harmonic voltage containing rate, harmonic current containing ratio, total harmonic distortion and current harmonics resultant distortion rate computing formula to calculate each bus harmonic wave situation.
2. the little Power System Steady-state harmonic analysis method of the many buses of line end synchro measure signal as claimed in claim 1, is characterized in that, in described step 1, uses the first-harmonic of FFT decomposition computation each point, amplitude and the initial phase of each harmonic voltage and current.
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| CN103809023A (en) * | 2014-01-26 | 2014-05-21 | 西南交通大学 | Grid synchronization harmonic phasor measurement method based on binary search |
| CN104360153A (en) * | 2014-10-22 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Method for detecting and analyzing harmonic waves of power grids in online manner |
| CN104502795A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Intelligent fault diagnosis method suitable for microgrid |
| CN105337279A (en) * | 2014-08-12 | 2016-02-17 | 国家电网公司 | Analysis method and apparatus for harmonic current and harmonic voltage of power grid in access to power distribution network |
| CN109100568A (en) * | 2018-06-25 | 2018-12-28 | 南方电网科学研究院有限责任公司 | Mains by harmonics general survey analysis method, device, equipment and medium |
| CN109541308A (en) * | 2019-01-25 | 2019-03-29 | 中国科学院电工研究所 | Harmonic analysis method based on distributed plesiochronous power grid measuring system |
| CN109617029A (en) * | 2018-12-24 | 2019-04-12 | 中国电力科学研究院有限公司 | A kind of electric network protection method and system based on harmonic protection device |
| CN110850203A (en) * | 2019-11-04 | 2020-02-28 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
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| CN104360153A (en) * | 2014-10-22 | 2015-02-18 | 江苏省电力公司淮安供电公司 | Method for detecting and analyzing harmonic waves of power grids in online manner |
| CN104502795A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Intelligent fault diagnosis method suitable for microgrid |
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| CN109617029B (en) * | 2018-12-24 | 2022-09-30 | 中国电力科学研究院有限公司 | Power grid protection method and system based on harmonic protection device |
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| CN109541308B (en) * | 2019-01-25 | 2020-12-04 | 中国科学院电工研究所 | Harmonic wave analysis method based on distributed quasi-synchronous power grid measurement system |
| CN110850203A (en) * | 2019-11-04 | 2020-02-28 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
| CN110850203B (en) * | 2019-11-04 | 2021-09-24 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
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