CN202888833U - Power quality control system merged with active electric power filter and reactive compensation device - Google Patents
Power quality control system merged with active electric power filter and reactive compensation device Download PDFInfo
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- CN202888833U CN202888833U CN2012202764213U CN201220276421U CN202888833U CN 202888833 U CN202888833 U CN 202888833U CN 2012202764213 U CN2012202764213 U CN 2012202764213U CN 201220276421 U CN201220276421 U CN 201220276421U CN 202888833 U CN202888833 U CN 202888833U
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Abstract
The utility model discloses a power quality control system merged with an active electric power filter and a reactive compensation device. The power quality control system is composed of an active electric power filter and a reactive compensation device, and is characterized in that the active electric power filter and the reactive compensation device are connected in parallel via a breaker and then are respectively connected to a three-phase line of an electrical network. The system exhibits both the advantage of low cost of a conventional reactive power compensation device and the advantage of fine compensation performance of a conventional active electric power filter. Harmonic waves and reactive power in the system can be compensated dynamically, and a running state of equipment is adjusted based on a real-time system parameter to avoid self-excited oscillation.
Description
Technical field
The utility model relates to harmonic wave inhibition and reactive power compensation technology field in the electric power quality, more particularly, relates to a kind of quality of power supply control system that merges Active Power Filter-APF and reactive-load compensator.
Background technology
Along with the development of national economy and the raising of living standards of the people, power electronic equipment is widely used in field of industrial production.The variation of matter has occured in modern power load structure, and the access of various non-linear and time variation power consumption equipments such as inverter, rectifier, electric furnace arrangement for producing steel, rolling mill etc. causes its day by day significantly negative effect to the quality of power supply.According in November, 2008 European Union's quality of power supply survey report show, only annually in Europe pollute the economic loss that causes just up to 1,500 hundred million dollars because of the quality of power supply and electrical equipment.Although domesticly yet there are no the investigation that launches around power quality problem, predictably, the quality of power supply is directly connected to the overall benefit of national economy, how to improve the quality of power supply and has become a urgent important topic that solves.
Active Power Filter-APF can not only suppress Harmonious Waves in Power Systems effectively as a kind of novel electric power electric device, also has to a certain extent the function of reactive power dynamic compensation concurrently.Its basic principle is according to harmonic wave and fundamental reactive current in the real-time detected electrical network, by the rule action of control switch pipe, produces the offset current of an equal and opposite in direction, opposite direction.According to Kirchhoff's current law (KCL), the offset current that the harmonic current in the electrical network and reactive current are just produced by active electric filter device " counteracting " has promoted the quality of power supply in the electrical network to a certain extent.
Although active electric filter device can compensating power on principle, inevitably promoted the capacitance grade of device, this is a larger burden at cost and reliability.Although traditional reactive power compensation device cost is low, stability high, its dynamic compensation ability is a problem that can not be ignored.Therefore how the distributor capacitance grade reduces dynamic response time, improves on the problems such as cost performance and operational reliability to have important practical significance.
Chinese patent " hybrid active electric filter and control method thereof " (application number: 200610070553.X) provide a kind of hybrid active electric filter and control method thereof.Its structure is: it is composed in series filter branches by active filter and passive filter, and this branch road is in parallel with the nonlinear load that needs filtering, and it comprises that also power network current detects with current detector I and offset current detector II; Current detector I one termination electrical network input circuit, the other end is connected to source filter; Current detector II one termination filter branches, the other end is connected to source filter.Yet though this application provides the Active Power Filter-APF with certain compensation effect, but the compensation effect of the method is limited.
In view of this, be necessary to provide a kind of quality of power supply control system that merges Active Power Filter-APF and reactive-load compensator, to overcome defects.
Summary of the invention
The purpose of this utility model provides a kind of quality of power supply control system that merges Active Power Filter-APF and reactive-load compensator, it has the low and good advantage of Active Power Filter-APF compensation performance of traditional reactive power compensation device cost simultaneously, can carry out dynamic compensation to the harmonic wave in the system and reactive power, simultaneously avoid self-oscillation according to real-time system parameter adjustment controls running status, have good cost performance.
The technical scheme that the utility model adopts is: a kind of quality of power supply control system that merges Active Power Filter-APF and reactive-load compensator, formed by Active Power Filter-APF and reactive power compensator two parts, it is characterized in that, be connected to respectively on the three-phase line of electrical network by circuit breaker after Active Power Filter-APF and the reactive power compensator parallel connection.
The quality of power supply control system of aforesaid fusion Active Power Filter-APF and reactive-load compensator is characterized in that, described Active Power Filter-APF is comprised of dc bus capacitor and discharge loop, three-phase bridge circuit, charge circuit, output filter circuit; Electric current is given described dc bus capacitor charging through the resistance via of described charge circuit and the commutating circuit of described three-phase bridge circuit inside; Move and boost to described dc bus capacitor by moving the upper brachium pontis of described three-phase bridge circuit, voltage stabilization namely puts into operation; Described dc bus capacitor and discharge loop are connected with the DC side of described three-phase bridge circuit, are used for the impulse level of combination producing different duty; This impulse level is incorporated into the power networks by the LC current filtering that described output filter circuit forms, and generates corresponding offset current.
The quality of power supply control system of aforesaid fusion Active Power Filter-APF and reactive-load compensator, it is characterized in that, described reactive power compensator is by several capacitor switching the electric circuit constitutes, after system starts, according to the real-time compound mode of controlling different capacitor switching circuit without the distribution of work.
The beneficial effects of the utility model are:
1, Active Power Filter-APF is well combined with reactive power compensation device, topological structure is simple, is easy to realize.
2, optimize the distribution of reactive power, used Active Power Filter-APF to promote the dynamic compensation characteristic of reactive power.
3, brought into play fully the advantage of Active Power Filter-APF and reactive power compensation device, on operation stability and cost performance, good lifting has been arranged.
Description of drawings
Fig. 1 is the structural representation that the utility model merges the quality of power supply control system of Active Power Filter-APF and reactive-load compensator.
Fig. 2 is the control block diagram of quality of power supply control system of the present utility model.
Fig. 3 is the Current Control block diagram of quality of power supply control system of the present utility model.
Embodiment
Below by embodiment, the utility model is described in further detail by reference to the accompanying drawings.
Label declaration in the accompanying drawing: 1, dc bus capacitor and discharge loop, 2, three-phase bridge circuit, 3, charge circuit, 4, output filter circuit, 5, Active Power Filter-APF, 6, the capacitor switching circuit, 7, reactive power compensator, 8, the load-side current transformer, 9, the node voltage instrument transformer, 10, signal processing unit, 11, phase locked-loop unit, 12, current regulator, 13, dq decoupling zero unit, 14, signal processing unit, 15, signal processing unit, 16, abc-dq multi-coordinate converter unit, 17, abc-dq multi-coordinate converter unit, 18, voltage control loop, 19, the SVPWM modulating unit, 20, the offset current generating unit, 21, current transformer, 22 are surveyed in compensation, 5 subharmonic current PI controllers, 23,7 subharmonic current PI controllers, 24,11 subharmonic current PI controllers, 25,13 subharmonic current PI controllers, 26,5 subharmonic rotating coordinate transformation unit, 27,7 subharmonic rotating coordinate transformation unit, 28,11 subharmonic rotating coordinate transformation unit, 29,13 subharmonic rotating coordinate transformation unit, 30, d axle comprehensive unit, 31, q axle comprehensive unit, 32, the current PI controller, 33, the reactive current control unit, 34, the DC voltage control unit.
As shown in Figure 1, electrical network is connected with respectively active power filter 5 and reactive power compensator 7 by a circuit breaker.Active Power Filter-APF 5 is comprised of dc bus capacitor and discharge loop 1, three-phase bridge circuit 2, charge circuit 3, output filter circuit 4.In soft start-up process, electric current through the commutating circuit of charge circuit 3 resistance vias and three-phase bridge circuit 2 inside to capacitor charging; After capacitance voltage was stable gradually, the upper brachium pontis by action three-phase bridge circuit 2 moved and boosts to dc bus capacitor, when voltage stabilization can put into operation during to a certain set point.During normal operation, dc bus capacitor and discharge loop 1 are connected with the DC side of three-phase bridge circuit 2, are used for the impulse level of combination producing different duty; This impulse level is incorporated into the power networks by the LC current filtering that output filter circuit 4 forms, and generates corresponding offset current.Reactive power compensator 7 is comprised of several capacitor switching circuit 6, after system starts, according to the real-time compound mode of controlling different capacitor switching circuit 6 without the distribution of work.
As shown in Figure 2, electrical network load-side electric current, voltage detect by load-side current transformer 8 and node voltage instrument transformer 9 respectively, and the small-signal of detection is carried out the Signal Pretreatment links such as level conversion, anti-aliasing filter by signal processing unit 10.Also for the output of installing provides the frequency clock benchmark, this is realized by phase locked-loop unit 11 voltage signal except utilizing instantaneous reactive power theory calculating instantaneous reactive.Input control system calculated in real time after compensation side current signal carried out level conversion, anti-aliasing filter by signal processing unit 14.Digital signal after analog-to-digital conversion becomes mixed and disorderly distorted signal into first-harmonic and each harmonic signal orderly, that differentiate easily by abc-dq multi-coordinate converter unit 16.Specific subharmonic in the distorted signal directly can be changed into DC component by abc-dq multi-coordinate converter unit 16, other remaining signals then are converted into alternating current component, can realize the separation of first-harmonic and each harmonic signal by a simple digital filter.Compensate and survey current transformer 21 by signal processing unit 15 detection offset currents sizes, this compensating current signal is inputted abc-dq multi-coordinate converter unit 17 and is followed the tracks of control with the load-side detection signal of corresponding secondary frequencies according to current regulator 12.In order to reduce the coupling of dq axle to the negative influence that control performance brings, in control, carry out the dq decoupling zero by the 13 pairs of loops in dq decoupling zero unit.For the effect that guarantees to compensate, need to dynamically control the Active Power Filter-APF DC side, this control signal is added in the command signal of dq axle by voltage control loop 18.The command signal of output generates 6 road PWM ripple signals and switching status signal to offset current generating unit 20 by SVPWM modulating unit 19, reaches the compensation effect to mains by harmonics and reactive power.
As shown in Figure 3,5 subharmonic current PI controllers, 22,7 subharmonic current PI controllers, 23,11 subharmonic current PI controllers, 24,13 subharmonic current PI controllers 25 carry out the adjusting of PI current inner loop to 5 in the electrical network, 7,11 and 13 subharmonic respectively.Signal after 28,13 subharmonic rotating coordinate transformation unit 29,27,11 subharmonic rotating coordinate transformation unit, 26,7 subharmonic rotating coordinate transformation unit, 5 subharmonic rotating coordinate transformation unit are regulated PI respectively is rotated changes in coordinates, with regulated value by each time independently the rotating coordinate system unification transform under the first-harmonic rotating coordinate system.D axle comprehensive unit 30 and q axle comprehensive unit 31 integrate the unified calculation of being convenient to subsequent algorithm with the regulated value under the first-harmonic rotational coordinates of each harmonic respectively.Reactive current control unit 33 take the input reactive power breach rate and reactive power breach rate of change as reference, rule by inner setting makes up cover reactive power compensation device and an Active Power Filter-APF coordinated operation state, it is directly controlled the combination of switching of reactive power compensator and switching mode, utilizes reactive current to be added to for the idle breach of Active Power Filter-APF and realizes in the electric current loop.DC voltage control unit 34 is to utilize in electric current loop active power of stack to compensate the dc voltage fluctuation that causes because of own loss and running status.Fundamental active current and fundamental reactive current are converted into the level amount by current PI controller 32, with the compensation of harmonic signal stack realization to harmonic wave in the electrical network and reactive power.
Provide the operating procedure of whole system below in conjunction with above-mentioned explanation:
Step 1, system survey 21 pairs of operation of power networks real-time statuss of current transformer by load-side current transformer 8, node voltage instrument transformer 9, compensation and carry out signal sampling.
Step 2, sampled signal are carried out level conversion, anti-aliasing filter etc. by signal processing unit 10, signal processing unit 14, signal processing unit 15 respectively.
Step 3, to utilize instantaneous reactive power theory to calculate instantaneous meritorious, instantaneous reactive, apparent power.
Step 4, load-side electric current and compensation side electric current are carried out the dq conversion, isolate the subharmonic such as 5,7,11,13.
Step 5, the harmonic signal of correspondence is carried out the PI interative computation.
Step 9, the active current of reactive current and voltage being calculated outer shroud superpose with fundamental signal, and carry out first-harmonic PI interative computation.
The above is preferred embodiment of the present utility model only, is not limited to the utility model.The content that is not described in detail in this specification belongs to the known prior art of this area professional and technical personnel.
Claims (3)
1. quality of power supply control system that merges Active Power Filter-APF and reactive-load compensator, formed by Active Power Filter-APF and reactive power compensator two parts, it is characterized in that, be connected to respectively on the three-phase line of electrical network by circuit breaker after Active Power Filter-APF and the reactive power compensator parallel connection.
2. the quality of power supply control system of fusion Active Power Filter-APF according to claim 1 and reactive-load compensator, it is characterized in that described Active Power Filter-APF is comprised of dc bus capacitor and discharge loop, three-phase bridge circuit, charge circuit, output filter circuit; Electric current is given described dc bus capacitor charging through the resistance via of described charge circuit and the commutating circuit of described three-phase bridge circuit inside; Move and boost to described dc bus capacitor by moving the upper brachium pontis of described three-phase bridge circuit, voltage stabilization namely puts into operation; Described dc bus capacitor and discharge loop are connected with the DC side of described three-phase bridge circuit, are used for the impulse level of combination producing different duty; This impulse level is incorporated into the power networks by the LC current filtering that described output filter circuit forms, and generates corresponding offset current.
3. the quality of power supply control system of fusion Active Power Filter-APF according to claim 1 and reactive-load compensator, it is characterized in that, described reactive power compensator is by several capacitor switching the electric circuit constitutes, after system starts, according to the real-time compound mode of controlling different capacitor switching circuit without the distribution of work.
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| CN2012202764213U CN202888833U (en) | 2012-06-13 | 2012-06-13 | Power quality control system merged with active electric power filter and reactive compensation device |
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| CN2012202764213U CN202888833U (en) | 2012-06-13 | 2012-06-13 | Power quality control system merged with active electric power filter and reactive compensation device |
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| CN202888833U true CN202888833U (en) | 2013-04-17 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744396A (en) * | 2014-01-08 | 2014-04-23 | 国家电网公司 | Device applied to coordination control over SVG (static var generator) and APF (active power filter) |
| CN104852379A (en) * | 2015-05-14 | 2015-08-19 | 电子科技大学 | Instruction compensation control method of active power filter |
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
| CN104993486A (en) * | 2015-07-07 | 2015-10-21 | 上海华艾软件股份有限公司 | Active power filter |
| CN105449688A (en) * | 2015-12-17 | 2016-03-30 | 南京亚派科技股份有限公司 | Decoupling control system and method of hybrid reactive compensation system |
| CN107612296A (en) * | 2017-09-26 | 2018-01-19 | 中原工学院 | A kind of multi-mode electric power system based on three-phase bridge |
| CN110168384A (en) * | 2017-09-08 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of harmonic detecting method and Active Power Filter-APF |
-
2012
- 2012-06-13 CN CN2012202764213U patent/CN202888833U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744396A (en) * | 2014-01-08 | 2014-04-23 | 国家电网公司 | Device applied to coordination control over SVG (static var generator) and APF (active power filter) |
| CN103744396B (en) * | 2014-01-08 | 2016-04-20 | 国家电网公司 | A kind of device being applied to SVG, APF cooperation control |
| CN104852379A (en) * | 2015-05-14 | 2015-08-19 | 电子科技大学 | Instruction compensation control method of active power filter |
| CN104852379B (en) * | 2015-05-14 | 2017-02-22 | 电子科技大学 | Instruction compensation control method of active power filter |
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
| CN104917181B (en) * | 2015-06-30 | 2018-06-26 | 华为技术有限公司 | Idle and harmonic compensation method, device and system |
| CN104993486A (en) * | 2015-07-07 | 2015-10-21 | 上海华艾软件股份有限公司 | Active power filter |
| CN105449688A (en) * | 2015-12-17 | 2016-03-30 | 南京亚派科技股份有限公司 | Decoupling control system and method of hybrid reactive compensation system |
| CN110168384A (en) * | 2017-09-08 | 2019-08-23 | 深圳欣锐科技股份有限公司 | A kind of harmonic detecting method and Active Power Filter-APF |
| CN107612296A (en) * | 2017-09-26 | 2018-01-19 | 中原工学院 | A kind of multi-mode electric power system based on three-phase bridge |
| CN107612296B (en) * | 2017-09-26 | 2019-02-26 | 中原工学院 | A kind of multi-mode power supply system based on three-phase bridge |
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Granted publication date: 20130417 Termination date: 20130613 |