CN103605002A - Harmonic impedance measurement apparatus of electric power system - Google Patents
Harmonic impedance measurement apparatus of electric power system Download PDFInfo
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- CN103605002A CN103605002A CN201310565115.0A CN201310565115A CN103605002A CN 103605002 A CN103605002 A CN 103605002A CN 201310565115 A CN201310565115 A CN 201310565115A CN 103605002 A CN103605002 A CN 103605002A
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Abstract
The invention relates to a harmonic impedance measurement apparatus of an electric power system. A transformer T is connected with a public electric network P; the harmonic impedance measurement apparatus NHID is connected to an A phase, a B phase and a C phase of a low-voltage side of the transformer T. The NHID is composed of a harmonic injector ID, a control unit CD, a power source unit SU and a measurement calculation unit MCM; the harmonic injector ID includes a direct-current energy storage capacitor C, large-power electronic power switches from S1 to S6, and a three-phase boosting transformer Ts1. And the whole injection process is completely controllable. According to the invention, precise measurement and calculation can be carried out to obtain the harmonic impedance of the system and reliable harmonic impedance parameters can be provided for harmonic treatment.
Description
Technical field
The present invention relates to a kind of Harmonious Waves in Power Systems impedance measurement device.
Background technology
Power Electronic Technique has obtained development at full speed in recent years, strong support is provided to the technology such as the improvement of power system power supply performance and EHV transmission and direct current transportation, is applied in more and more widely the every field of national economy.But in electrical network, power electronic equipment, as a nonlinear load, becomes harmonic source important in electrical network.
In order to control the harmonic pollution in utility network, standard GB/T/T 14549-93 < < quality of power supply utility network harmonic wave > > has stipulated user's harmonic emissions limit value, need the key issue solving is how at PCC, system and user's harmonic emission level reasonably to be assessed, main still around system and user's harmonic impedance is estimated to launch for the estimation of harmonic emission level.For cleaning system, normally utilize circuit resonance principle installing filter to suppress higher hamonic wave.In the situation that obtaining Harmonious Waves in Power Systems impedance, can better design the parameter with Optimal Filter, to reach the filter effect meeting the demands.
Due to the vital role of harmonic impedance for harmonic wave control and harmonic management, correlation technique and device that therefore necessary exploitation harmonic impedance is measured.Conventional harmonic impedance measuring method is mainly the Return Law and undulate quantity method etc. at present, but they are all easily subject to the interference of background harmonics, in the situation that background harmonics fluctuation is larger, and the likely distortion of its assessment result.
Characteristic harmonics refers to the harmonic wave that system produces while normally moving, and it is that frequency is the intrinsic harmonic signal of fundamental frequency integral multiple, and uncharacteristic harmonics i.e. the frequency harmonics of other except characteristic harmonics.
Summary of the invention
The object of this invention is to provide a kind of measurement Harmonious Waves in Power Systems impedance measurement device.The key issue solving is in the situation that not affecting the normal operation of electric system, and accurate measurement calculates system harmonic impedance, for harmonic wave control provides reliable harmonic impedance parameter.
In harmonic impedance is measured, select rational injection device can make measurement result degree of accuracy higher and drop to minimum on the impact of electrical network, the present invention solves its technical matters, the technical scheme adopting is, transformer T connects utility network P, harmonic impedance measurement device NHID connection transformer T low-pressure side A, B, C three-phase; Harmonic impedance measurement device NHID is by harmonic wave injector ID, control module CD, power supply unit SU and measure computing unit MCM and form; Harmonic wave injector ID is by DC energy storage capacitor C, high-power electric and electronic switch S 1 ~ S6, and three-phase voltage increasing transformer Ts1 forms, and its injection process is completely controlled.
Principle of work of the present invention is:
The T of electric substation is by utility grid, and power supply provides DC support power supply to harmonic wave injector ID, and assurance DC energy storage capacitor C powers on and is pressed in normal range, while measuring harmonic impedance, first control module CD sends instruction to harmonic wave injector ID, harmonic wave injector ID is to transformer T low-pressure side A, B, C three-phase injects the uncharacteristic harmonics of characteristic frequency ± 10Hz scope successively, measure computing unit MCM successively to decanting point near transformer T low-pressure side A1, B1, C1 voltage and current data and close load side A2, B2, C2 data are carried out survey record, respectively to A1, B1, C1 measurement point and A2, B2, the data analysis of C2 measurement point is calculated, can obtain respectively system impedance and user's impedance of near 20 the non-characteristic frequencies of characteristic frequency, 20 non-characteristic frequency impedances that obtain are obtained to system and user characteristics frequency impedance by method of interpolation.
compared with prior art, the invention has the beneficial effects as follows:
One, the present invention is with respect to traditional Return Law and undulate quantity method, harmonic wave injector is all completely adjustable in each harmonic frequency and amplitude, avoid in some frequency range relative harmonic content too low and cause that harmonic impedance assesses inaccurate situation, measured spectral range very wide.
Two, the present invention injects uncharacteristic harmonics in system, less to the normal influence on system operation of system, and can not be subject to the interference of background harmonics, and simultaneously because signal to noise ratio (S/N ratio) is very high, installed capacity requires relatively little, has reduced investment and operating cost.
Three, in the present invention, measuring the ingredient that computing unit can be used as electric substation's electric energy quality monitoring system realizes the Real-time Collection of electric substation's current and voltage data and analysis.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
Fig. 2 is the structural representation of the harmonic wave injector (ID) of the embodiment of the present invention.
Embodiment
Embodiment
Fig. 1,2 illustrates, and a kind of embodiment of the present invention is:
A kind of measurement Harmonious Waves in Power Systems impedance means.Transformer T connects utility network P, harmonic impedance measurement device NHID connection transformer T low-pressure side A, B, C three-phase.Harmonic impedance measurement device NHID is by harmonic wave injector ID, control module CD, power supply unit SU and measure computing unit MCM and form.
Fig. 1 illustrates, and the course of work of the present invention and principle of work are: electric system characteristic harmonics is 3 times (150Hz), 5 times (250Hz), 7 times (350Hz) etc.When measuring 3 (150Hz) harmonic impedances of electrical network, first control module CD sends instruction to harmonic wave injector ID, harmonic wave injector ID injects 149Hz uncharacteristic harmonics to transformer T low-pressure side A, B, C three-phase, measure computing unit MCM decanting point is carried out to survey record near transformer T low-pressure side A1, B1, C1 three-phase voltage and current data and decanting point near load side A2, B2, C2 three-phase voltage and current data, A1, B1, C1 three-phase voltage and current data are carried out to analytical calculation and draw 149Hz system impedance Z
31and A2, B2, C2 three-phase voltage and current data are carried out to analytical calculation draw 149Hz user's side impedance Z
31 ,.Control module CD sends instruction again to harmonic wave injector ID, harmonic wave injector ID injects 151Hz uncharacteristic harmonics to transformer (T) low-pressure side A, B, C three-phase, measure computing unit MCM electric current and voltage data are carried out to survey record, analysis meter is calculated 151Hz system impedance Z
32with user's side impedance Z
32 ,.In like manner, system harmonic impedance and the user-side harmonic impedance of 140Hz ~ 148Hz, 152Hz ~ 159Hz can be obtained, by method of interpolation, 3 (150Hz) harmonic impedance Z of system can be obtained
3with user's side 3 subharmonic impedance Z
3 ,.In like manner, can obtain the characteristic harmonics impedance of other 5 times or 7 inferior systems and user's side.
Fig. 2 illustrates, in the present invention harmonic wave injector ID by DC energy storage capacitor C, high-power electric and electronic switch S 1 ~ S6, three-phase voltage increasing transformer Ts1 forms.DC energy storage capacitor C is used for storing power supply unit energy, to S1 ~ S6, provides work required direct supply.S1 ~ S6 is operated in inverter mode, and it is reverse into the adjustable three-phase alternating current of frequency by single-phase electricity.S1 ~ S6 is IGCT(integrated gate commutated thyristor) or IGBT (igbt).
Claims (1)
1. a Harmonious Waves in Power Systems impedance measurement device, is characterized in that:
Transformer (T) connects utility network (P), harmonic impedance measurement device (NHID) connection transformer (T) low-pressure side A, B, C three-phase; Harmonic impedance measurement device NHID is by harmonic wave injector (ID), control module (CD), power supply unit (SU) and measure computing unit (MCM) and form; Harmonic wave injector (ID) is by DC energy storage capacitor C, high-power electric and electronic switch S 1 ~ S6, and three-phase voltage increasing transformer (Ts1) forms, and its injection process is completely controlled.
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| CN201310565115.0A CN103605002A (en) | 2013-11-13 | 2013-11-13 | Harmonic impedance measurement apparatus of electric power system |
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| CN201310565115.0A CN103605002A (en) | 2013-11-13 | 2013-11-13 | Harmonic impedance measurement apparatus of electric power system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198843A (en) * | 2014-08-14 | 2014-12-10 | 西南交通大学 | Power grid impedance frequency property testing method and device |
| CN104502764A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | Method for detecting fault of high-voltage frequency inverter before power on |
| CN104615827A (en) * | 2015-02-05 | 2015-05-13 | 贵州电网公司电网规划研究中心 | Capacitor resonance electromagnetic transient model |
| CN105510719A (en) * | 2015-11-30 | 2016-04-20 | 云南电网有限责任公司玉溪供电局 | Three-phase power grid harmonic impedance measurement method |
| CN107576847A (en) * | 2017-09-07 | 2018-01-12 | 西南交通大学 | A kind of vehicular tractive power supply system impedance frequency characteristic measurement apparatus and its measuring method |
| CN108196127A (en) * | 2018-01-22 | 2018-06-22 | 华北电力大学 | HVDC transmission system harmonic impedance scan method and device |
| CN110058084A (en) * | 2019-04-15 | 2019-07-26 | 南方电网科学研究院有限责任公司 | A kind of the harmonic impedance measuring system and method for converter power transformer |
| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN111505439A (en) * | 2020-04-21 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | Impedance frequency sweeping device for direct current system, control method thereof and storage medium |
| CN117310293A (en) * | 2023-11-28 | 2023-12-29 | 广东电网有限责任公司 | Power grid impedance measurement method and device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198843B (en) * | 2014-08-14 | 2017-01-11 | 西南交通大学 | Power grid impedance frequency property testing method and device |
| CN104198843A (en) * | 2014-08-14 | 2014-12-10 | 西南交通大学 | Power grid impedance frequency property testing method and device |
| CN104502764A (en) * | 2014-12-19 | 2015-04-08 | 上海发电设备成套设计研究院 | Method for detecting fault of high-voltage frequency inverter before power on |
| CN104502764B (en) * | 2014-12-19 | 2017-09-15 | 上海发电设备成套设计研究院 | A kind of fault detection method on high voltage frequency converter before electricity |
| CN104615827A (en) * | 2015-02-05 | 2015-05-13 | 贵州电网公司电网规划研究中心 | Capacitor resonance electromagnetic transient model |
| CN104615827B (en) * | 2015-02-05 | 2016-10-19 | 贵州电网公司电网规划研究中心 | A kind of capacitor resonant tank electrical-magnetic model |
| CN105510719A (en) * | 2015-11-30 | 2016-04-20 | 云南电网有限责任公司玉溪供电局 | Three-phase power grid harmonic impedance measurement method |
| CN107576847B (en) * | 2017-09-07 | 2024-04-26 | 西南交通大学 | Impedance frequency characteristic measuring device and measuring method for vehicle-mounted traction power supply system |
| CN107576847A (en) * | 2017-09-07 | 2018-01-12 | 西南交通大学 | A kind of vehicular tractive power supply system impedance frequency characteristic measurement apparatus and its measuring method |
| CN108196127A (en) * | 2018-01-22 | 2018-06-22 | 华北电力大学 | HVDC transmission system harmonic impedance scan method and device |
| CN108196127B (en) * | 2018-01-22 | 2019-12-24 | 华北电力大学 | Harmonic impedance scanning method and device for high-voltage direct-current transmission system |
| CN110058084B (en) * | 2019-04-15 | 2021-06-08 | 南方电网科学研究院有限责任公司 | Harmonic impedance measurement system and method of converter transformer |
| CN110058084A (en) * | 2019-04-15 | 2019-07-26 | 南方电网科学研究院有限责任公司 | A kind of the harmonic impedance measuring system and method for converter power transformer |
| CN111077372A (en) * | 2019-12-24 | 2020-04-28 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and system for measuring harmonic impedance of alternating current-direct current power transmission system |
| CN111505439A (en) * | 2020-04-21 | 2020-08-07 | 国网江苏省电力有限公司电力科学研究院 | Impedance frequency sweeping device for direct current system, control method thereof and storage medium |
| CN117310293A (en) * | 2023-11-28 | 2023-12-29 | 广东电网有限责任公司 | Power grid impedance measurement method and device |
| CN117310293B (en) * | 2023-11-28 | 2024-03-01 | 广东电网有限责任公司 | Power grid impedance measurement method and device |
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Application publication date: 20140226 |