CN103091554B - 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 PDF

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CN103091554B
CN103091554B CN201310066178.1A CN201310066178A CN103091554B CN 103091554 B CN103091554 B CN 103091554B CN 201310066178 A CN201310066178 A CN 201310066178A CN 103091554 B CN103091554 B CN 103091554B
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voltage
harmonic
bus
current
micro
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CN103091554A (en
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程艳
孙树敏
高峰
丁广乾
李广磊
毛庆波
张用
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shandong Electric Power Co Ltd
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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

Line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method
Technical field
The present invention relates to a kind of micro-capacitance sensor stable state harmonic analysis method, particularly line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method.
Background technology
Micro-capacitance sensor is as a part for bulk power grid, and its voltage and current provided should be the simple alternating current amount containing few harmonic wave in the ideal case.But, along with using and the increase of consumer of nonlinear material containing electric arc and ferromagnetic material etc. of the various fairings containing non-linear electric components such as semiconductors, large-capacity transducer, large-scale ac-dc conversion device and other power electronic equipment, a large amount of harmonic injection electrical networks.Generation ofharmonic, is a kind of pollution to the quality of power supply of micro-capacitance sensor, reduces power supply quality, brings harm to the safe, stable of connected bulk power grid and economical operation simultaneously.Harmonic wave makes the electrical equipment in micro-capacitance sensor produce extra harmonic loss, reduces the efficiency of electrical energy production, transmission and utilization; The normal work of the various electrical equipment of harmonic effects, easily make it produce the phenomenons such as overheated, vibration & noise, and make insulation ag(e)ing, serviceable life shortens, and even breaks down or damages; Harmonic wave can cause micro-capacitance sensor and bulk power grid local parallel resonant or series resonance, harmonic content is amplified, causes the equipment burnouts such as capacitor, even cause 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, even cause systematic failures, the safe operation of serious threat electric system; Harmonic wave makes electrical measurement occur comparatively big error, and power supply department correctly cannot measure the electricity consumption situation of each user, causes electric energy metrical chaotic; For communication facilities and the electronic equipment of electric system outside, harmonic wave can produce interference, even in extreme situations, also can threaten the safety of communication facilities and personnel.
Therefore, micro-capacitance sensor frequency analysis normally runs particularly important for micro-capacitance sensor.Measure fast and accurately and analyze the harmonic wave in micro-capacitance sensor, micro-capacitance sensor harmonic wave situation can be grasped exactly, for power supply department or power consumer judge and improve the quality of power supply to provide foundation, be convenient to the automatic adjustment of micro-capacitance sensor running status, be conducive to safe, stable, the Effec-tive Function ensureing micro-capacitance sensor.
Chinese scholars has done large quantity research for frequency analysis.Mainly contain frequency domain analysis, be temporal analysis and Time-Frequency Analysis method.The humorous wave method of existing micro-capacitance sensor is the harmonic wave situation only paying close attention to micro-capacitance sensor and Iarge-scale system points of common connection place, existing micro-capacitance sensor harmonic analysis method needs to install and measure device to obtain the voltage and current signal of points of common connection at points of common connection place, uses the harmonic wave situation of this voltage and current signal analysis points of common connection.Along with the raising that power consumer in the injection of harmonic wave a large amount of in micro-capacitance sensor and micro-capacitance sensor requires for the quality of power supply, analyze the harmonic wave situation of each classification bus in micro-capacitance sensor and Iarge-scale system points of common connection and micro-capacitance sensor and the improvement of harmonic wave is more and more subject to people's attention.The harmonic distortion situation measuring each bus in micro-capacitance sensor is the important prerequisite of harmonic wave control, and existing harmonic analysis method needs at the voltage and current signal measuring each bus.On each bus, additionally need install and measure device to record the voltage and current signal of each bus for this reason, for existing harmonic analysis method provides calculating data, considerably increase equipment investment.
Summary of the invention
Object of the present invention overcomes the above problems exactly, provides a kind of based on line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method.In existing micro-capacitance sensor, distributed power source is positioned at line end, exporting, having installed measurement mechanism, can be realized the synchro measure of the voltage and current signal of line end by high precision time dissemination system at its grid-connected interface for better controlling distributed power source.The voltage and current signal measured carries out communication by energy management system.The present invention with line end voltage and current synchro measure data for reference, each harmonic parameter is calculated according to fast Fourier analysis method or wavelet transformation, in conjunction with micro-capacitance sensor network equation, energy management system can the harmonic wave situation of each bus of many buses micro-capacitance sensor under indirect calculation stable situation.The present invention, utilizes the measurement data of existing line end to carry out frequency analysis, avoids and installs additional detections device at each bus of micro-capacitance sensor, save great amount of investment.
For realizing above object, the present invention adopts following technical scheme:
Based on many buses micro-capacitance sensor stable state harmonic analysis method of line end synchro measure signal, comprise the following steps:
A kind of line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method, its step is:
Step one, gathers the voltage and current synchronizing signal of micro-capacitance sensor line end check point, and obtains check point and be adjacent line impedance information between bus;
Step 2, according to obtaining the amplitude of voltage and current synchronizing signal, initial phase combined circuit end point detection point is adjacent line impedance information between bus, 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 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 one, use the first-harmonic of FFT decomposition computation each point, the amplitude of each harmonic voltage and current and initial phase.
Beneficial effect of the present invention: the present invention adopts line end synchro measure signal indirect calculation micro-capacitance sensor harmonic wave situation, not only can grasp the harmonic wave situation of each bus in micro-capacitance sensor, for micro-capacitance sensor harmonic wave control provides important evidence, also avoid and each bus be installed the extra measuring equipment monitoring quality of power supply in micro-capacitance sensor, save great amount of investment.
Accompanying drawing explanation
Fig. 1 is many buses micro-capacitance sensor basic block diagram.
Embodiment
With reference to the accompanying drawings adopted technical scheme is further elaborated below.
As shown in Figure 1, distributed electrical source current I s1and I s2be positioned at micro-capacitance sensor line end power supply, existing micro-capacitance sensor is at its grid-connected place S 1point and S 2point has all installed measurement mechanism, can obtain grid-connected place S 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, the amplitude of each harmonic voltage and current and initial phase;
In conjunction with S 1the amplitude of voltage and current of point and initial phase and S 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 2the amplitude of voltage and current of point and initial phase and S 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 bus connecting line.
The voltage of bus B1, B2 of obtaining from above-mentioned calculating and flow through the electric current phasor of bus connection line, therefrom can obtain each voltage, the first-harmonic of electric current and each harmonic effective value, 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.Composition graphs 1 of the present invention uses Matlab software to emulate, because in micro-capacitance sensor, harmonic wave is mainly odd harmonic, calculate for simplifying, this emulation is only considered 13 times and following odd harmonic, and the reason due to transformer can not consider the integer multiple subharmonic of 3, simulation result and this method result of calculation are in table 1, table 2 and table 3.
Table 1 bus 2 place harmonic voltage situation calculated value 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 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 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
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but 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 amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (2)

1. line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method, is characterized in that, its step is:
Step one, in micro-grid connection, place installs and measures device, and measurement mechanism gathers the voltage and current synchronizing signal of micro-capacitance sensor line end check point, and obtains check point and be adjacent line impedance information between bus;
Step 2, according to obtaining the amplitude of voltage and current synchronizing signal, initial phase combined circuit end point detection point is adjacent line impedance information between bus, 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 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. line end synchro measure signal many buses micro-capacitance sensor stable state harmonic analysis method as claimed in claim 1, is characterized in that, in described step one, uses the first-harmonic of FFT decomposition computation each point, the amplitude of each harmonic voltage and current and initial phase.
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Publication number Priority date Publication date Assignee Title
CN103809023B (en) * 2014-01-26 2016-08-24 西南交通大学 Synchronized harmonic phasor measuring method based on binary search
CN105337279B (en) * 2014-08-12 2018-04-06 国家电网公司 The analysis method and device of current and voltage harmonic during micro-capacitance sensor access power distribution network
CN104360153B (en) * 2014-10-22 2017-02-08 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
CN104502795B (en) * 2014-11-26 2017-11-14 国家电网公司 A kind of intelligent failure diagnosis method suitable for micro-capacitance sensor
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
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
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102270854A (en) * 2011-08-05 2011-12-07 华北电力大学 Island detecting method based on positive feedback of voltage harmonic distortion
CN102324745A (en) * 2011-09-20 2012-01-18 山西合创电力科技有限公司 Control method and device of hybrid type active power dynamic filter in intelligent power grid
CN102323488A (en) * 2011-05-30 2012-01-18 武汉大学 Anti-jamming measuring method for power transmission line positive-sequence capacitance based on harmonic component
GB2483910A (en) * 2010-09-24 2012-03-28 Qingchang Zhong Controlling inverters to maintain total harmonic distortion of output voltage and current
CN102841251A (en) * 2012-08-14 2012-12-26 华北电力大学 Electric car charging station harmonic wave detection method in microgrid

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9379640B2 (en) * 2011-06-23 2016-06-28 The Board Of Trustees Of The University Of Illinois Scalable single-stage differential power converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2483910A (en) * 2010-09-24 2012-03-28 Qingchang Zhong Controlling inverters to maintain total harmonic distortion of output voltage and current
CN102323488A (en) * 2011-05-30 2012-01-18 武汉大学 Anti-jamming measuring method for power transmission line positive-sequence capacitance based on harmonic component
CN102270854A (en) * 2011-08-05 2011-12-07 华北电力大学 Island detecting method based on positive feedback of voltage harmonic distortion
CN102324745A (en) * 2011-09-20 2012-01-18 山西合创电力科技有限公司 Control method and device of hybrid type active power dynamic filter in intelligent power grid
CN102841251A (en) * 2012-08-14 2012-12-26 华北电力大学 Electric car charging station harmonic wave detection method in microgrid

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PCC处谐波分析的新方法;陈彬等;《继电器》;20060501;第34卷(第9期);第60-63、86页 *
基于FFT的高精度谐波检测算法;薛蕙等;《中国电机工程学报》;20021231;第22卷(第12期);第106-110页 *
基于PCC的大系统与微电网静态建模仿真;陈井锐等;《电力系统保护与控制》;20110801;第39卷(第15期);第19页第3节和图4 *

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