CN205453129U - Active filter power harmonic compensation system - Google Patents
Active filter power harmonic compensation system Download PDFInfo
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- CN205453129U CN205453129U CN201620254561.9U CN201620254561U CN205453129U CN 205453129 U CN205453129 U CN 205453129U CN 201620254561 U CN201620254561 U CN 201620254561U CN 205453129 U CN205453129 U CN 205453129U
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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
- Y02E40/20—Active power filtering [APF]
Abstract
The utility model discloses an active filter power harmonic compensation system, including filtering unit, voltage harmonic detection unit, harmonic impedance calculating unit, voltage harmonic compensation calculating unit, load current harmonic detection unit, synthesize compensation unit, filtering unit connection electric wire netting output, voltage harmonic detection unit connection electric wire netting output, harmonic impedance calculating unit connects filtering unit output, voltage harmonic compensation calculating unit connects voltage harmonic detection unit with harmonic impedance calculating unit, the load current harmonic detection unit passes through current transformer connected load, it connects to synthesize compensation unit voltage harmonic compensation calculating unit the load current harmonic detection unit. The utility model discloses an active filter power harmonic compensation system calculates through the harmonic current who introduces wave filter self to the integrated load side harmonic current compensate the circuit, makes power filter filtering performance improve.
Description
Technical field
This utility model relates to wave filter power supply, compensates system particularly to a kind of active filter supply harmonic.
Background technology
Active Power Filter-APF primarily serves the purpose of the harmonic current compensating electrical load, and the harmonic current detecting load by being arranged on the current transformer of load-side controls, as instruction, the harmonic current that wave filter output is reverse, and then makes grid side electric current without harmonic wave.
When carrying out Design of Active Power Filter, in order to reduce the high frequency ripple of wave filter output itself, the general LCL of employing exports filtering mode.Due to the introducing of capacitor filtering C, certain low frequency capacitive reactance characteristic will be presented, when electrical network on-load voltage at electrical network access point, the inflow of reactive current will be caused, when particularly line voltage has harmonic distortion, it will introduce certain harmonic current, deepen the distortion of power network current.In most industry spot, owing to band carries heavier, site environment voltage distortion is the most serious, and Active Power Filter-APF can compensate for the harmonic current of load；That is, power-supply filter self also can produce harmonic current being filtered when, but the harmonic current that wave filter self is not introduced by prior art compensates so that power-supply filter filtering performance is poor.
Utility model content
This utility model is to overcome the above-mentioned deficiency of prior art, it is provided that a kind of can to wave filter self introduce harmonic current compensate so that power-supply filter filtering performance improve active filter supply harmonic compensate system.
In order to realize above-mentioned utility model purpose, the technical solution adopted in the utility model is:
A kind of active filter supply harmonic compensates system, including filter unit, voltage harmonic detector unit, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, and comprehensive compensation unit,
Described filter unit connects electrical network outfan, for being filtered the voltage of electrical network input；
Described voltage harmonic detector unit connects electrical network outfan, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and n times harmonic voltage；
Described harmonic impedance computing unit connects described filter unit outfan, is impedance during N for calculating described filter unit at overtone order；
Described voltage harmonic compensation calculation unit connects described voltage harmonic detector unit and described harmonic impedance computing unit, for according to described fundamental voltage and n times harmonic voltage, described be impedance during N at overtone order, calculate corresponding n times harmonic current, and the individual harmonic current of the n times harmonic current of described correspondence is synthesized wave filter harmonic current；
Load current harmonic detecting unit connects load by current transformer, flows through the n times harmonic current of load for detection, and the individual harmonic current of the n times harmonic current described load produced synthesizes load harmonic current；
Described comprehensive compensation unit connects described voltage harmonic compensation calculation unit, described load current harmonic detecting unit, for described wave filter harmonic current, described load harmonic current are overlapped, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated；
Wherein N is the positive integer more than 1.
Further, described filter unit includes that the first inductance, the second inductance, electric capacity, described first inductance are connected with described second inductance, and described first inductance is also connected with electrical network outfan, and described electric capacity is parallel between described first inductance and described second inductance.
Further, described filter unit also includes resistance, described resistance and described capacitances in series, described harmonic impedance computing unit for calculating described first inductance, described electric capacity, the circuit of described second inductance composition are impedance during N at overtone order.
This utility model provides a kind of active filter supply harmonic compensation method simultaneously, comprises the following steps:
The individual harmonic current of the electric current of load, and the individual harmonic current superposition to the described electric current flowing through load are flow through in detection, obtain load harmonic current；
Calculate the individual harmonic current that filter circuit produces, and the individual harmonic current superposition that described filter circuit is produced, obtain filter circuit harmonic current；
Described load harmonic current is added with described wave filter harmonic current and obtains comprehensive harmonic current, according to described comprehensive harmonic current, load is compensated.
Further, the individual harmonic current that described calculating filter circuit produces includes:
Detect each harmonic voltage of described filter circuit input；
Detect the impedance that each harmonic voltage of described filter circuit is corresponding；
According to the electric current that the impedance computation filter circuit each harmonic that described each harmonic voltage is corresponding with described each harmonic voltage is corresponding.
Further, stating filter circuit and include that the first inductance, the second inductance, electric capacity, described first inductance are connected with described second inductance, described first inductance is also connected with electrical network outfan, and described electric capacity the first inductance in parallel and described is between described second inductance.
Further, described filter circuit also includes resistance, described resistance and described capacitances in series, the impedance detecting each harmonic voltage of described filter circuit corresponding is, detects described first inductance, described electric capacity, the circuit of described inductance composition are impedance during N at overtone order.
Further, described each harmonic voltage and described individual harmonic current use fft algorithm to calculate, and the computing formula of harmonic impedance is:
Wherein L1For the inductance value of described first inductance, C is the capacitance of described electric capacity, and R is the resistance value of described resistance, and w is each harmonic angular frequency.
Further, as R=0, the computing formula of described harmonic impedance is used for calculating impedance of fundamental frequency, and calculates fundamental reactive current according to fundamental voltage with described impedance of fundamental frequency, compensates load.
Compared with prior art, the beneficial effects of the utility model
A kind of active filter supply harmonic of the present utility model is compensated system and is calculated by the harmonic current introducing wave filter self, and circuit is compensated by integrated load side harmonic current so that power-supply filter filtering performance improves.
Accompanying drawing explanation
It is that a kind of active filter supply harmonic of the present utility model compensates system module block diagram shown in Fig. 1.
It is that a kind of active filter supply harmonic of the present utility model compensates system construction drawing shown in Fig. 2.
It it is a kind of active filter supply harmonic compensation method FB(flow block) of the present utility model shown in Fig. 3.
It is that the single harmonic component voltage decomposition in a specific embodiment of the present utility model calculates schematic diagram with harmonic impedance shown in Fig. 4.
Detailed description of the invention
Below in conjunction with detailed description of the invention, this utility model is described in further detail.But this should not being interpreted as, the scope of the above-mentioned theme of this utility model is only limitted to below example, and all technology realized based on this utility model content belong to scope of the present utility model.
It is that a kind of active filter supply harmonic of the present utility model compensates system module block diagram shown in Fig. 1, including filter unit, voltage harmonic detector unit, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit
Described filter unit connects electrical network outfan, for being filtered the voltage of electrical network input；
Described voltage harmonic detector unit connects electrical network outfan, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and n times harmonic voltage；
Described harmonic impedance computing unit connects described filter unit outfan, is impedance during N for calculating described filter unit at overtone order；
Described voltage harmonic compensation calculation unit connects described voltage harmonic detector unit and described harmonic impedance computing unit, for according to described fundamental voltage and n times harmonic voltage, described be impedance during N at overtone order, calculate corresponding n times harmonic current, and the individual harmonic current of the n times harmonic current of described correspondence is synthesized wave filter harmonic current；
Load current harmonic detecting unit connects load by current transformer, flows through the n times harmonic current of load for detection, and the individual harmonic current of the n times harmonic current described load produced synthesizes load harmonic current；
Described comprehensive compensation unit connects described voltage harmonic compensation calculation unit, described load current harmonic detecting unit, for described wave filter harmonic current, described load harmonic current are overlapped, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated；
Wherein N is the positive integer more than 1.
A kind of active filter supply harmonic of the present utility model is compensated system and is calculated by the harmonic current introducing wave filter self, and circuit is compensated by integrated load side harmonic current so that power-supply filter filtering performance improves.
In a specific embodiment referring to Fig. 2, described filter unit includes the first inductance, the second inductance, electric capacity, described first inductance is connected with described second inductance, and described first inductance is also connected with electrical network outfan, and described electric capacity the first inductance in parallel and described is between described second inductance.
Described filter unit also includes resistance, described resistance and described capacitances in series, described harmonic impedance computing unit for calculating described first inductance, described electric capacity, the circuit of described inductance composition are impedance during N at overtone order.
Active Power Filter-APF uses LCL filtering mode, after importing system power bus, will not introduce harmonic current because of the distortion of industry spot line voltage, and compensation effect is more preferable.
This utility model provides a kind of active filter supply harmonic compensation method simultaneously, comprises the following steps:
The individual harmonic current of the electric current of load, and the individual harmonic current superposition to the described electric current flowing through load are flow through in detection, obtain load harmonic current；
Calculate the individual harmonic current that filter circuit produces, and the individual harmonic current superposition that described filter circuit is produced, obtain filter circuit harmonic current；
Described load harmonic current is added with described wave filter harmonic current and obtains comprehensive harmonic current, according to described comprehensive harmonic current, load is compensated.
Further, the individual harmonic current that described calculating filter circuit produces includes:
Detect each harmonic voltage of described filter circuit input；
Detect the impedance that each harmonic voltage of described filter circuit is corresponding；
According to the electric current that the impedance computation filter circuit each harmonic that described each harmonic voltage is corresponding with described each harmonic voltage is corresponding.
Further, stating filter circuit and include that the first inductance, the second inductance, electric capacity, described first inductance are connected with described second inductance, described first inductance is also connected with electrical network outfan, and described electric capacity is parallel between described first inductance and described second inductance.
Further, described filter circuit also includes resistance, described resistance and described capacitances in series, the impedance detecting each harmonic voltage of described filter circuit corresponding is, detects described first inductance, described electric capacity, the circuit of described second inductance composition are impedance during N at overtone order.
Further, described each harmonic voltage and described individual harmonic current use fft algorithm to calculate, and the computing formula of harmonic impedance is:
Wherein L1For the inductance value of described first inductance, C is the capacitance of described electric capacity, and R is the resistance value of described resistance, and w is each harmonic angular frequency.
Further, as R=0, the computing formula of described harmonic impedance is used for calculating impedance of fundamental frequency, and calculates fundamental reactive current according to fundamental voltage with described impedance of fundamental frequency, compensates load.
Embodiment 1:
Present embodiment illustrates the electrical network for 50Hz frequency, the calculating of 5 subharmonic currents that Active Power Filter-APF is introduced into, concrete is the fundamental voltage V1n=1 and quintuple harmonics voltage decomposited referring to Fig. 4, Fig. 4
V2n=5.Harmonic impedance loop is made up of L1, C and R, and its impedance isFor Active Power Filter-APF, L1, C and R are Fixed Design parameters, are used directly for calculating its impedance parameter value for every subharmonic.W is each harmonic angular frequency, therefore w=2 π f, and f is harmonic frequency.
5 subharmonic current computational methods are:
Harmonic impedanceL1, C and the R parameter of bringing wave filter design into will obtain 5 subharmonic impedance Z 5, thus be given by the harmonic current that can calculate 5 timesBy given for this subharmonic current comprehensive with 5 subharmonic currents of load-side current transformer detection, it is simply that whole power system 5 subharmonic currents altogether after there was added active power filter.By that analogy, the individual harmonic current that Active Power Filter-APF introduces can calculate and comprehensively in this way.
By this compensation method, Active Power Filter-APF uses LCL filtering mode, after importing system power bus, harmonic current will not be introduced because of the distortion of industry spot line voltage, the compensation problem of the harmonic current that Active Power Filter-APF power supply introduces during effective solution load-side current detecting, compensation effect is more preferable, and does not increase any hardware cost.
Not just for harmonic current, this method can also calculate the fundamental wave reactive power that Active Power Filter-APF introduces, owing to when system designs, L1 and R is the least, therefore Active Power Filter-APF LCL loop mainly presents big capacitive reactance for first-harmonic, the watt current of negligible inflow when carrying out first-harmonic and calculating, namely ignore R (R=0), thenBy voltage harmonic detection module, use FFT to calculate fundamental voltage, finally calculated fundamental reactive current i1 by fundamental voltage with impedance of fundamental frequency Z1, fundamental reactive current i1 is given closed loop controller and compensates the fundamental reactive current that active electric power filter introduces.
This utility model can not only compensate the harmonic pollution of introducing, can also compensate the capacitive reactive power electric current of absorption simultaneously.
Above in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail, but this utility model is not restricted to above-mentioned embodiment, in the case of without departing from the spirit and scope of claims hereof, those skilled in the art may be made that various amendment or remodeling.
Claims (3)
1. an active filter supply harmonic compensates system, it is characterised in that include filter unit, voltage harmonic detector unit, harmonic impedance computing unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit,
Described filter unit connects electrical network outfan, for being filtered the voltage of electrical network input；
Described voltage harmonic detector unit connects electrical network outfan, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and n times harmonic voltage；
Described harmonic impedance computing unit connects described filter unit outfan, is impedance during N for calculating described filter unit at overtone order；
Described voltage harmonic compensation calculation unit connects described voltage harmonic detector unit and described harmonic impedance computing unit, for according to described fundamental voltage and n times harmonic voltage, described be impedance during N at overtone order, calculate corresponding n times harmonic current, and the individual harmonic current of the n times harmonic current of described correspondence is synthesized wave filter harmonic current；
Load current harmonic detecting unit connects load by current transformer, flows through the n times harmonic current of load for detection, and the individual harmonic current of the n times harmonic current described load produced synthesizes load harmonic current；
Described comprehensive compensation unit connects described voltage harmonic compensation calculation unit, described load current harmonic detecting unit, for described wave filter harmonic current, described load harmonic current are overlapped, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated；
Wherein N is the positive integer more than 1.
The most according to claim 1, a kind of active filter supply harmonic compensates system, it is characterized in that, described filter unit includes the first inductance, the second inductance, electric capacity, described first inductance is connected with described second inductance, described first inductance is also connected with electrical network outfan, and described electric capacity is parallel between described first inductance and described second inductance.
The most according to claim 2, a kind of active filter supply harmonic compensates system, it is characterized in that, described filter unit also includes resistance, described resistance and described capacitances in series, described harmonic impedance computing unit for calculating described first inductance, described electric capacity, the circuit of described second inductance composition are impedance during N at overtone order.
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| CN201620254561.9U CN205453129U (en) | 2016-03-29 | 2016-03-29 | Active filter power harmonic compensation system |
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| CN201620254561.9U CN205453129U (en) | 2016-03-29 | 2016-03-29 | Active filter power harmonic compensation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633969A (en) * | 2016-03-29 | 2016-06-01 | 四川英杰电气股份有限公司 | Active power filter power source harmonic compensation system and method |
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2016
- 2016-03-29 CN CN201620254561.9U patent/CN205453129U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633969A (en) * | 2016-03-29 | 2016-06-01 | 四川英杰电气股份有限公司 | Active power filter power source harmonic compensation system and method |
| CN105633969B (en) * | 2016-03-29 | 2018-02-16 | 四川英杰电气股份有限公司 | A kind of active filter supply harmonic compensation system and method |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20160810 Effective date of abandoning: 20180216 |
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| AV01 | Patent right actively abandoned |