CN102157940A - Device for eliminating voltage harmonics of power system - Google Patents
Device for eliminating voltage harmonics of power system Download PDFInfo
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- CN102157940A CN102157940A CN2011100743886A CN201110074388A CN102157940A CN 102157940 A CN102157940 A CN 102157940A CN 2011100743886 A CN2011100743886 A CN 2011100743886A CN 201110074388 A CN201110074388 A CN 201110074388A CN 102157940 A CN102157940 A CN 102157940A
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- 238000006243 chemical reaction Methods 0.000 claims description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a device for eliminating voltage harmonics of a power system, which comprises a harmonic voltage source detection device, a fundamental wave filter, a high frequency transformer, an AC (Alternating Current) power source, a power unit, a rectifying unit, a filtering unit and a controller, wherein the fundamental wave filter is formed by connecting a reactor 1, a reactor 2 and a capacitor in series; the harmonic voltage source detection device collects the real-time harmonic voltage of the system and inputs a harmonic voltage signal to the controller; the controller calculates out a voltage which is equal to the harmonic voltage in magnitude and opposite to the harmonic voltage in direction; the power unit inputs the voltage into an LC (Loop Circuit) branch, formed by connecting the reactors and the capacitor in series, through the high frequency transformer, and the voltage and the harmonic voltage are superposed so that the output harmonic voltage becomes zero and the effect of filtering out the harmonic voltage in a power grid is achieved; and the controller is connected with the AC power source, the rectifying unit and the power unit respectively. In the device, based on the superposition principle, the purpose of eliminating the influence of a power-side higher harmonic voltage source to a load can be achieved by connecting the harmonic voltage sources in series, and the response speed is high.
Description
Technical field
The present invention relates to a kind of device that is used to remove the power system voltage harmonic wave.
Background technology
The voltage harmonic of electric power system is present in the electric power system of each electric pressure, and harmonic wave can cause that supply line's loss increases, and damages electric equipment, reduces the reliability of powering.Therefore standard GB/T 14549-93 " quality of power supply public electric wire net harmonic wave " has strict demand to the voltage harmonic content of different electric pressure electric power systems.Make that voltage harmonic content satisfies this request of national standard in the electric power system of each electric pressure, for the harmonic wave that suppresses electrical network two kinds of solutions are arranged at present: make load not produce harmonic wave, or compensate by appropriate device.
1) essence that makes load not produce the method for harmonic wave is by transforming load, make it not inject harmonic wave to electric power system, or the harmonic content of injecting is very little, thereby can not make voltage harmonic content on the associated bus be no more than the requirement of standard GB/T14549-93 " quality of power supply public electric wire net harmonic wave ".This method is a kind of solution the most intuitively, but transform load and be not suitable for all loads, and some load can't produce harmonic wave by transformation at all less, is not general especially therefore.
2) compensating by appropriate device is a kind of solution that has development prospect.
Uninterrupted power supply (ups) Unity can be used for being connected between power supply and the harmonic source load, except guaranteeing power supply when the line voltage fault to sensitive loads, can also the compensation harmonic source fractional harmonic that produces of load, reduce to be injected into the harmonic content of line voltage.
More than the effect of removing voltage harmonic of removing power system voltage harmonic device of two kinds of methods also be not fine, and the response time awaits to improve.
Summary of the invention
The purpose of this invention is to provide a kind of device that is used to remove the power system voltage harmonic wave, this device can reach by the series connection harmonic voltage source based on principle of stacking eliminates the purpose of mains side higher harmonic voltage source to the load influence, and response speed is fast.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of device that is used to remove the power system voltage harmonic wave, the first-harmonic filter, high frequency transformer, AC power, power cell, rectification unit, filter unit, the controller that comprise the harmonic voltage source checkout gear, form by reactor one, reactor two, capacitors in series, the harmonic voltage source checkout gear has two, an input that is arranged on this device, be used for detecting the voltage source that contains harmonic wave, the output that another is arranged on this device is used for detecting the voltage source of removing behind the harmonic wave; Two harmonic voltage source checkout gears are all with the voltage source signal input controller that detects;
The harmonic voltage source checkout gear collects the real-time harmonic voltage of system, with the harmonic voltage signal input controller, by controller calculate one with harmonic voltage equal and opposite in direction, voltage that direction is opposite, import the LC branch road that constitutes by reactor, capacitors in series through high frequency transformer by power cell, this voltage and harmonic voltage are superimposed, making the harmonic wave output voltage is zero, reaches the effect of filtering mains by harmonics voltage; Controller is connected with AC power, rectification unit, power cell respectively.
Be parallel with the by-pass switch that shields between the input of the described first-harmonic filter of forming by reactor one, reactor two, capacitors in series and the output, the equipment that between capacitor and output, the is provided with switch that puts into operation.
Compared with prior art, the invention has the beneficial effects as follows:
Based on principle of stacking, by the series connection harmonic voltage source, can reach and eliminate mains side higher harmonic voltage source the load influence, response speed is fast.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structure chart of single group insulating power supply;
Fig. 3 is the structure chart of many group insulating power supplies;
Fig. 4 is the structure chart of uncontrollable rectification unit;
Fig. 5 is the structure chart of two level PWM rectification units;
Fig. 6 is the structure chart of three-level pwm rectification unit;
Fig. 7 is the structure chart of two level PWM inverters;
Fig. 8 is the structure chart of three-level pwm inverter;
Fig. 9 is the structure chart of the multi-electrical level inverter of H bridge unit plural serial stage;
Figure 10 is the theory diagram of controller.
Embodiment
See Fig. 1, a kind of device that is used to remove the power system voltage harmonic wave, comprise harmonic voltage source checkout gear 1, harmonic voltage source checkout gear 2, by reactor 3, reactor 4, the first-harmonic filter that capacitor 5 is composed in series successively, high frequency transformer 6, AC power 7, power cell 8, rectification unit 9, filter unit C, controller 10, harmonic voltage source checkout gear 1 is arranged on the input of this device, be used for detecting the voltage source that contains harmonic wave, harmonic voltage source checkout gear 2 is arranged on the output of this device, be used for detecting the voltage source of removing behind the harmonic wave, two harmonic voltage source checkout gears are all with the voltage source signal input controller 10 that detects; Controller 10 also is connected with AC power 7, rectification unit 9, power cell 8 respectively.
Harmonic voltage source checkout gear 1 collects the real-time harmonic voltage of system, with harmonic voltage signal input controller 10, by controller 10 calculate one with harmonic voltage equal and opposite in direction, voltage that direction is opposite, import the LC branch road that constitutes by reactor 4, capacitor 5 series connection through high frequency transformer 6 by power cell 8, this voltage and harmonic voltage are superimposed, making the harmonic wave output voltage is zero, reaches the effect of filtering mains by harmonics voltage.AC power 7 provides power supply for control unit 10, rectification unit, filter unit C, power cell 8.The parameter that controller 10 is gathered rectification unit 9, the output DC stream of control rectification unit 9 is with the output result of guaranteed output unit 8.
This device has protection and bypass functionality, is parallel with by-pass switch 11 between the input of the first-harmonic filter that is composed in series by reactor 3, reactor 4, capacitor 5 and the output, and the equipment that is provided with between capacitor 5 and the output switch 13 that puts into operation.By control by-pass switch 11, the equipment switch 13 that puts into operation that equipment is out of service when device has fault, equipment is had protective effect.
The controller 10 of this device is finished following function:
1) harmonic voltage of the system that collects by harmonic voltage source checkout gear 1 of collection analysis;
2) parameter by comprehensive series reactor 3, reactor 4, capacitor 5, high frequency transformer 6 draws the harmonic current (or comprehensive electric current each harmonic electric current sum) that power cell 8 is produced;
3) gather and analyze the target harmonic current of harmonic voltage that harmonic voltage source checkout gear 2 obtains and power cell 8 and adjust by calculating, the harmonic voltage that makes harmonic voltage source checkout gear 2 is for " 0 " or satisfy burden requirement;
4) gather the parameter of rectification unit 9, and control the output dc voltage of rectification unit 9, the output result of guaranteed output unit 8;
5) protection and bypass functionality, the running status of checkout gear, by control by-pass switch 11 and the equipment switch 13 that puts into operation that equipment is out of service when device has fault.
Harmonic voltage source checkout gear 1 and harmonic voltage source checkout gear 2 are any devices that can accurately transmit and characterize voltage and harmonic content thereof, and it should have higher response speed and very little error; Can adopt voltage sensor.
Reactor 3 and reactor 4 are industrial reactance device, its reactance be not more than system impedance 10% and constitute the 50Hz filters with capacitor 5, to guarantee the stability of system.
Reactor 4 and capacitor 5 comprehensive formation LC branch roads, resonance point is lower than the minimum number of filtering harmonic wave, generally selects below 3 times.
The switch that the operating frequency of high frequency transformer 6 the is higher than inverter operating frequency of helping build, preferably more than 2 times, capacity is greater than the total capacity sum of each harmonic.
The switching device of power cell 8 is generally selected the full-control type device of IGBT or higher switching frequency, adopts H bridge or other topological modes, with electric current as controlled target.
The specific embodiment of the present invention can have the independent assortment of multiple power supply type, rectification topology, inversion topological, and the present invention mainly narrates following several:
Mode 1: single group insulating power supply+uncontrollable rectification unit+two level PWM inverters, see Fig. 2, Fig. 4, Fig. 7.
Mode 2: single group insulating power supply+uncontrollable rectification unit+three-level pwm inverter, see Fig. 2, Fig. 4, Fig. 8.
Mode 3: single group insulating power supply+two level PWM rectification units+two level PWM inverters, see Fig. 2, Fig. 5, Fig. 7.
Mode 4: single group insulating power supply+two level PWMs rectification unit+three-level pwm inverter, see Fig. 2, Fig. 5, Fig. 8.
Mode 5: single group insulating power supply+three-level pwm rectification unit+two level PWM inverters, see Fig. 2, Fig. 6, Fig. 7.
Mode 6: single group insulating power supply+three-level pwm rectification unit+three-level pwm inverter, see Fig. 2, Fig. 6, Fig. 8.
Mode 7: organize insulating power supply+uncontrollable rectification unit+H bridge cascaded multilevel inverter more, see Fig. 3, Fig. 4, Fig. 9.
Mode 8: organize insulating power supply+two level PWMs rectification unit+H bridge cascaded multilevel inverter more, see Fig. 3, Fig. 5, Fig. 9.
Mode 9: organize insulating power supply+three-level pwm rectification unit+H bridge cascaded multilevel inverter more, see Fig. 3, Fig. 6, Fig. 9.
Fig. 4 is the structure chart of the uncontrollable full-bridge rectification of three-phase unit, constitutes the uncontrollable full-bridge rectification structure of three-phase by diode D1, D2, D3, D4, D5, D6, the filter unit that after the rectification signal input is made of capacitor C, signal input power unit 8 after the filtering.
Fig. 5 is two level PWM rectification unit structure charts, form two level PWM rectifications with diode (D1, D2, D3, D4, D5, D6) inverse parallel respectively by six IGBT full-control type devices (IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6), signal is through filter unit C input power unit 8 after the rectification.
Fig. 6 is a three-level pwm rectification unit structure chart, whenever forms by 4 IGBT devices, and IGBT device series connection in twos, each IGBT device is diode of inverse parallel respectively; The mid point of two series IGBTs is by diode (D1, D2; D3, D4; D5, D6) link together, and diode (D1, D2; D3, D4; D5, D6) mid point and dc capacitor C1, C2 mid point couple together, and makes the direct clamper of neutral point current potential, so this rectification topology is also referred to as neutral point clamper type three-level PWM rectifier.
Fig. 7 is the structure chart of two level PWM inverter power units, form two level PWM inversions with diode (D1, D2, D3, D4, D5, D6) inverse parallel respectively by six IGBT full-control type devices (IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6), the LC branch road that signal is made of reactor 4, capacitor 5 series connection through high frequency transformer 6 inputs after the inversion.
Fig. 8 is a three-level pwm inverter power unit structure chart, whenever forms by 4 IGBT devices, and IGBT device series connection in twos, each IGBT device is diode of inverse parallel respectively; The mid point of two series IGBTs is by diode (D1, D2; D3, D4; D5, D6) link together, and diode (D1, D2; D3, D4; D5, D6) mid point and dc capacitor C1, C2 mid point couple together, and makes the direct clamper of neutral point current potential.
Fig. 9 is the structure chart of the multi-electrical level inverter power cell of H bridge plural serial stage, and the H bridge of being made up of a plurality of full-control type device inverse parallel diodes is composed in series.
Figure 10 is controller principle figure, controller is made up of fpga chip, cpu chip, A/D chip, voltage signal or current signal enter cpu chip after the A/D conversion, enter fpga chip after cpu chip is handled, the control signal of output rectification unit, power cell after fpga chip is handled.
Claims (6)
1. device that is used to remove the power system voltage harmonic wave, it is characterized in that, the first-harmonic filter, high frequency transformer, AC power, power cell, rectification unit, filter unit, the controller that comprise the harmonic voltage source checkout gear, form by reactor one, reactor two, capacitors in series, the harmonic voltage source checkout gear has two, an input that is arranged on this device, be used for detecting the voltage source that contains harmonic wave, the output that another is arranged on this device is used for detecting the voltage source of removing behind the harmonic wave; Two harmonic voltage source checkout gears are all with the voltage source signal input controller that detects;
The harmonic voltage source checkout gear collects the real-time harmonic voltage of system, with the harmonic voltage signal input controller, by controller calculate one with harmonic voltage equal and opposite in direction, voltage that direction is opposite, import the LC branch road that constitutes by reactor, capacitors in series through high frequency transformer by power cell, this voltage and harmonic voltage are superimposed, making the harmonic wave output voltage is zero, reaches the effect of filtering mains by harmonics voltage; Controller is connected with AC power, rectification unit, power cell respectively.
2. a kind of device that is used to remove the power system voltage harmonic wave according to claim 1; it is characterized in that; be parallel with the by-pass switch that shields between the input of the described first-harmonic filter of forming by reactor one, reactor two, capacitors in series and the output, the equipment that between capacitor and output, the is provided with switch that puts into operation.
3. a kind of device that is used to remove the power system voltage harmonic wave according to claim 1 and 2 is characterized in that described rectification unit can be the uncontrollable full-bridge rectification of three-phase, two level PWM rectifications or three-level pwm rectifier structure.
4. a kind of device that is used to remove the power system voltage harmonic wave according to claim 1 and 2 is characterized in that, described power cell can be the multi-electrical level inverter structure of two level PWM inverters, three-level pwm inverter or H bridge plural serial stage.
5. a kind of device that is used to remove the power system voltage harmonic wave according to claim 1 and 2 is characterized in that, described AC power can be single group insulating power supply or organizes the insulating power supply structure more.
6. a kind of device that is used to remove the power system voltage harmonic wave according to claim 1 and 2, it is characterized in that, described controller is made up of fpga chip, cpu chip, A/D chip, voltage signal or current signal enter cpu chip after the A/D conversion, after handling, cpu chip enters fpga chip, the control signal of output rectification unit, power cell after fpga chip is handled.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100743886A CN102157940B (en) | 2011-03-28 | 2011-03-28 | Device for eliminating voltage harmonics of power system |
| PCT/CN2012/071512 WO2012130004A1 (en) | 2011-03-28 | 2012-02-23 | Device for eliminating voltage harmonics in power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100743886A CN102157940B (en) | 2011-03-28 | 2011-03-28 | Device for eliminating voltage harmonics of power system |
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| CN102157940A true CN102157940A (en) | 2011-08-17 |
| CN102157940B CN102157940B (en) | 2013-07-24 |
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| CN2011100743886A Active CN102157940B (en) | 2011-03-28 | 2011-03-28 | Device for eliminating voltage harmonics of power system |
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| WO (1) | WO2012130004A1 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377235A (en) * | 2011-11-02 | 2012-03-14 | 东南大学 | Cascaded converter-based multifunctional high-speed switch device |
| WO2012130004A1 (en) * | 2011-03-28 | 2012-10-04 | 荣信电力电子股份有限公司 | Device for eliminating voltage harmonics in power system |
| CN103236800A (en) * | 2013-05-14 | 2013-08-07 | 武汉大学 | Novel topological structure voltage source type inverter and adjusting method |
| CN104052325A (en) * | 2014-06-05 | 2014-09-17 | 上海交通大学 | Design method of cascading multi-level inverter with minimized wide-range voltage distortion |
| CN104300562A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase voltage |
| CN104300563A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase currents and handling negative sequence |
| CN104333035A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Photovoltaic power distribution system capable of suppressing power grid voltage unbalance |
| CN104934983A (en) * | 2015-04-23 | 2015-09-23 | 深圳市今朝时代新能源技术有限公司 | Multifunctional electric energy quality controller and electric energy quality control method |
| CN112165074A (en) * | 2020-09-18 | 2021-01-01 | 广东电网有限责任公司广州供电局 | Transformer neutral point protection device, system and circuit breaker |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
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| CN107707106B (en) * | 2017-11-03 | 2020-12-08 | 国网四川省电力公司电力科学研究院 | Resolution device for harmonic invasion in power standard detection |
| CN113130176B (en) * | 2021-04-23 | 2023-02-21 | 山东泰开检测有限公司 | High-voltage harmonic transformer |
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| CN2678226Y (en) * | 2004-01-07 | 2005-02-09 | 浙江大学 | Series mixed active power filter with fundamental bypass channel |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012130004A1 (en) * | 2011-03-28 | 2012-10-04 | 荣信电力电子股份有限公司 | Device for eliminating voltage harmonics in power system |
| CN102377235A (en) * | 2011-11-02 | 2012-03-14 | 东南大学 | Cascaded converter-based multifunctional high-speed switch device |
| CN103236800B (en) * | 2013-05-14 | 2015-04-15 | 武汉大学 | Novel topological structure voltage source type inverter and adjusting method |
| CN103236800A (en) * | 2013-05-14 | 2013-08-07 | 武汉大学 | Novel topological structure voltage source type inverter and adjusting method |
| CN104052325B (en) * | 2014-06-05 | 2016-07-06 | 上海交通大学 | The method for designing of the cascade multilevel inverter that voltage distortion minimizes on a large scale |
| CN104052325A (en) * | 2014-06-05 | 2014-09-17 | 上海交通大学 | Design method of cascading multi-level inverter with minimized wide-range voltage distortion |
| CN104300563A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase currents and handling negative sequence |
| CN104333035A (en) * | 2014-10-28 | 2015-02-04 | 国网辽宁省电力有限公司朝阳供电公司 | Photovoltaic power distribution system capable of suppressing power grid voltage unbalance |
| CN104300562A (en) * | 2014-10-28 | 2015-01-21 | 国网辽宁省电力有限公司朝阳供电公司 | Method for solving unbalance of three-phase voltage |
| CN104934983A (en) * | 2015-04-23 | 2015-09-23 | 深圳市今朝时代新能源技术有限公司 | Multifunctional electric energy quality controller and electric energy quality control method |
| CN104934983B (en) * | 2015-04-23 | 2018-04-27 | 深圳市今朝时代股份有限公司 | Multifunctional electric energy quality controller and electric energy quality control method |
| CN112165074A (en) * | 2020-09-18 | 2021-01-01 | 广东电网有限责任公司广州供电局 | Transformer neutral point protection device, system and circuit breaker |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012130004A1 (en) | 2012-10-04 |
| CN102157940B (en) | 2013-07-24 |
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