CN105633969A - Active power filter power source harmonic compensation system and method - Google Patents
Active power filter power source harmonic compensation system and method Download PDFInfo
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- CN105633969A CN105633969A CN201610191185.8A CN201610191185A CN105633969A CN 105633969 A CN105633969 A CN 105633969A CN 201610191185 A CN201610191185 A CN 201610191185A CN 105633969 A CN105633969 A CN 105633969A
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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
- Y02E40/20—Active power filtering [APF]
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses an active power filter power source harmonic compensation system. The active power filter power source harmonic compensation system includes a filtering unit, a voltage harmonic detection unit, a harmonic impedance calculation unit, a voltage harmonic compensation calculation unit, a load current harmonic detection unit and a comprehensive compensation unit; the filtering unit is connected with the output end of a power grid; the voltage harmonic detection unit is connected with the output end of the grid; the harmonic impedance calculation unit is connected with the output end of the filtering unit; the voltage harmonic compensation calculation unit is connected with the voltage harmonic detection unit and the harmonic impedance calculation unit; the load current harmonic detection unit is connected with a load through a current transformer; and the comprehensive compensation unit is connected with the voltage harmonic compensation calculation unit and the load current harmonic detection unit. According to the active power filter power source harmonic compensation system of the invention, harmonic current led by a filter itself is calculated, and a circuit is compensated based on load-side harmonic current, and therefore, the filtering performance of the power source filter can be improved.
Description
Technical field
The present invention relates to wave filter power supply, in particular to a kind of active filter supply harmonic make-up system and method.
Background technology
Active power filtering device mainly act as the harmonic current of compensates electric load, exports reverse harmonic current by being arranged on the harmonic current of the current transformer detection load of load-side as instruction control wave filter, and then makes grid side electric current without harmonic wave.
When carrying out active power filtering device and design, in order to reduce the high frequency ripple that wave filter itself exports, general employing LCL output filtering mode. Due to the introducing of electric capacity filtering C, certain low frequency capacitive reactance characteristic will be presented at electrical network access point, when electrical network on load voltage, the inflow of wattless current will be caused, when particularly electrical network voltage has a harmonic distortion, certain harmonic current will be introduced, deepen the distortion of power network current. In at present most industry spot, owing to band load is heavier, on-the-spot environment voltage distortion is also comparatively serious, and active power filtering device can the harmonic current of compensating load; That is, power filter self also can produce harmonic current when carrying out filtering, but the harmonic current that wave filter self is introduced all is not compensated by prior art so that power filter filtering performance is poor.
Summary of the invention
The invention reside in the above-mentioned deficiency overcoming prior art, it is provided that a kind of can to wave filter self introduce harmonic current compensate so that power filter filtering performance improve active filter supply harmonic make-up system and method.
In order to realize foregoing invention object, the technical solution used in the present invention is:
A kind of active filter supply harmonic make-up system, comprises filter unit, voltage harmonic detecting unit, harmonic wave impedance computation unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit,
Described filter unit connects electrical network output terminal, carries out filtering for the voltage inputted by electrical network;
Described voltage harmonic detecting unit connects electrical network output terminal, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and N subharmonic voltage;
Described harmonic wave impedance computation unit connects described filter unit output terminal, is impedance during N for calculating described filter unit at harmonic order;
Described voltage harmonic compensation calculation unit connects described voltage harmonic detecting unit and described harmonic wave impedance computation unit, for according to described fundamental voltage and N subharmonic voltage, described be impedance during N at harmonic order, calculate corresponding N subharmonic electric current, and each harmonic electric current of the N subharmonic electric current of described correspondence is synthesized wave filter harmonic current;
Load current harmonic detecting unit connects load by current transformer, and for detecting the N subharmonic electric current flowing through load, each harmonic electric current of the N subharmonic electric 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 carried out superposition, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated;
Wherein N be greater than 1 positive integer.
Further, described filter unit comprises the first inductance, the 2nd inductance, electric capacity, and described first inductance is connected with described 2nd inductance, and described first inductance also connects electrical network output terminal, and described Capacitance parallel connection and described first inductance are between described 2nd inductance.
Further, described filter unit also comprises resistance, described resistance and described capacitances in series, described harmonic wave impedance computation unit for calculate described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
The present invention provides a kind of active filter supply harmonic equalising means simultaneously, comprises the following steps:
The each harmonic electric current of the electric current of load is flow through in detection, and each harmonic electric current superposition to the described electric current flowing through load, obtain load harmonic current;
The each harmonic electric current that calculation of filtered circuit produces, and each harmonic electric current superposition produced by described filtering circuit, obtain filtering 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, each harmonic electric current that described calculation of filtered circuit produces comprises:
Detect each harmonic voltage of described filtering circuit input terminus;
Detect the impedance that each harmonic voltage of described filtering circuit is corresponding;
The electric current corresponding according to the impedance computation filtering circuit each harmonic that described each harmonic voltage and described each harmonic voltage are corresponding.
Further, stating filtering circuit and comprise the first inductance, the 2nd inductance, electric capacity, described first inductance is connected with described 2nd inductance, and described first inductance also connects electrical network output terminal, and described Capacitance parallel connection and described first inductance are between described 2nd inductance.
Further, described filtering circuit also comprises resistance, described resistance and described capacitances in series, the impedance detecting each harmonic voltage of described filtering circuit corresponding is, detect described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
Further, described each harmonic voltage and described each harmonic electric current adopt fft algorithm to calculate, and the calculation formula of humorous wave resistance 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 radian frequency.
Further, as R=0, the calculation formula of described humorous wave resistance is for calculating impedance of fundamental frequency, and calculates fundamental reactive current according to fundamental voltage and described impedance of fundamental frequency, load is compensated.
Compared with prior art, the useful effect of the present invention
A kind of active filter supply harmonic make-up system of the present invention is by calculating the harmonic current that wave filter self is introduced, and circuit is compensated by comprehensive load-side harmonic current so that power filter filtering performance improves.
Accompanying drawing explanation
It it is a kind of active filter supply harmonic make-up system module frame chart of the present invention shown in Fig. 1.
It it is a kind of active filter supply harmonic make-up system structure iron of the present invention shown in Fig. 2.
It it is a kind of active filter supply harmonic equalising means FB(flow block) of the present invention shown in Fig. 3.
It is the single harmonic component voltage decomposition in a specific embodiment of the present invention and harmonic wave impedance computation schematic diagram shown in Fig. 4.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail. But this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, and all technology realized based on content of the present invention all belong to the scope of the present invention.
It it is a kind of active filter supply harmonic make-up system module frame chart of the present invention shown in Fig. 1, comprise filter unit, voltage harmonic detecting unit, harmonic wave impedance computation unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit
Described filter unit connects electrical network output terminal, carries out filtering for the voltage inputted by electrical network;
Described voltage harmonic detecting unit connects electrical network output terminal, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and N subharmonic voltage;
Described harmonic wave impedance computation unit connects described filter unit output terminal, is impedance during N for calculating described filter unit at harmonic order;
Described voltage harmonic compensation calculation unit connects described voltage harmonic detecting unit and described harmonic wave impedance computation unit, for according to described fundamental voltage and N subharmonic voltage, described be impedance during N at harmonic order, calculate corresponding N subharmonic electric current, and each harmonic electric current of the N subharmonic electric current of described correspondence is synthesized wave filter harmonic current;
Load current harmonic detecting unit connects load by current transformer, and for detecting the N subharmonic electric current flowing through load, each harmonic electric current of the N subharmonic electric 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 carried out superposition, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated;
Wherein N be greater than 1 positive integer.
A kind of active filter supply harmonic make-up system of the present invention is by calculating the harmonic current that wave filter self is introduced, and circuit is compensated by comprehensive load-side harmonic current so that power filter filtering performance improves.
In a specific embodiment referring to Fig. 2, described filter unit comprises the first inductance, the 2nd inductance, electric capacity, described first inductance is connected with described 2nd inductance, and described first inductance also connects electrical network output terminal, and described Capacitance parallel connection and described first inductance are between described 2nd inductance.
Described filter unit also comprises resistance, described resistance and described capacitances in series, described harmonic wave impedance computation unit for calculate described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
Active power filtering device adopts LCL filtering mode, after importing system power bus, can not introduce harmonic current because of the distortion of industry spot electrical network voltage, and compensation effect is better.
The present invention provides a kind of active filter supply harmonic equalising means simultaneously, comprises the following steps:
The each harmonic electric current of the electric current of load is flow through in detection, and each harmonic electric current superposition to the described electric current flowing through load, obtain load harmonic current;
The each harmonic electric current that calculation of filtered circuit produces, and each harmonic electric current superposition produced by described filtering circuit, obtain filtering 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, each harmonic electric current that described calculation of filtered circuit produces comprises:
Detect each harmonic voltage of described filtering circuit input terminus;
Detect the impedance that each harmonic voltage of described filtering circuit is corresponding;
The electric current corresponding according to the impedance computation filtering circuit each harmonic that described each harmonic voltage and described each harmonic voltage are corresponding.
Further, stating filtering circuit and comprise the first inductance, the 2nd inductance, electric capacity, described first inductance is connected with described 2nd inductance, and described first inductance also connects electrical network output terminal, and described Capacitance parallel connection and described first inductance are between described 2nd inductance.
Further, described filtering circuit also comprises resistance, described resistance and described capacitances in series, the impedance detecting each harmonic voltage of described filtering circuit corresponding is, detect described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
Further, described each harmonic voltage and described each harmonic electric current adopt fft algorithm to calculate, and the calculation formula of humorous wave resistance 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 radian frequency.
Further, as R=0, the calculation formula of described humorous wave resistance is for calculating impedance of fundamental frequency, and calculates fundamental reactive current according to fundamental voltage and described impedance of fundamental frequency, load is compensated.
Embodiment 1:
Present embodiment illustrates the electrical network for 50Hz frequency, active power filtering device is by the calculating of 5 subharmonic electric currents of introducing, and concrete is the fundamental voltage V1n=1 decomposited and five subharmonic voltages referring to Fig. 4, Fig. 4
V2n=5. Harmonic wave impedance path is made up of L1, C and R, and its impedance isFor active power filtering device, L1, C and R are Fixed Design parameters, it is possible to be directly used in the impedance parameter value calculating it for every subharmonic. W is each harmonic radian frequency, and therefore w=2 �� f, f are harmonic frequency.
5 subharmonic Current calculation methods are:
Humorous wave resistanceL1, C and the R parameter of bringing filter designs into will obtain 5 subharmonic impedance Z 5, and the harmonic current that thus can calculate 5 times is givenBy comprehensive for 5 subharmonic electric currents of given for this harmonic current detection with load-side current transformer, whole power system 5 subharmonic electric currents altogether after being added with active power filter exactly. Analogizing with this, each harmonic electric current that active power filtering device is introduced can calculate and comprehensive in this way.
By this kind of equalising means, active power filtering device adopts LCL filtering mode, after importing system power bus, harmonic current can not be introduced because of the distortion of industry spot electrical network voltage, the compensation problem of the harmonic current that active power filtering device power supply is introduced during effective solution load-side current detecting, compensation effect is better, and does not increase any hardware cost.
Not only for harmonic current, present method can also calculate the fundamental wave reactive power that active power filtering device is introduced, owing to L1 and R during system design is less, therefore active power filtering device LCL loop mainly presents big capacitive reactance for base ripple, the wattful current of inflow can be ignored when carrying out base ripple and calculate, also it is exactly ignore R (R=0), thenBy voltage harmonic detection module, it may also be useful to FFT calculates fundamental voltage, finally calculate fundamental reactive current i1 by fundamental voltage and impedance of fundamental frequency Z1, fundamental reactive current i1 is given the fundamental reactive current that closed loop controller compensates active electric power filter and introduces.
The present invention 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, the specific embodiment of the present invention is described in detail, but the present invention is not restricted to above-mentioned enforcement mode, in the spirit and scope situation of claim not departing from the application, the technician of this area can make various amendment or remodeling.
Claims (9)
1. an active filter supply harmonic make-up system, it is characterised in that, comprise filter unit, voltage harmonic detecting unit, harmonic wave impedance computation unit, voltage harmonic compensation calculation unit, load current harmonic detecting unit, comprehensive compensation unit,
Described filter unit connects electrical network output terminal, carries out filtering for the voltage inputted by electrical network;
Described voltage harmonic detecting unit connects electrical network output terminal, for being decomposed by the voltage that electrical network inputs, obtains fundamental voltage and N subharmonic voltage;
Described harmonic wave impedance computation unit connects described filter unit output terminal, is impedance during N for calculating described filter unit at harmonic order;
Described voltage harmonic compensation calculation unit connects described voltage harmonic detecting unit and described harmonic wave impedance computation unit, for according to described fundamental voltage and N subharmonic voltage, described be impedance during N at harmonic order, calculate corresponding N subharmonic electric current, and each harmonic electric current of the N subharmonic electric current of described correspondence is synthesized wave filter harmonic current;
Load current harmonic detecting unit connects load by current transformer, and for detecting the N subharmonic electric current flowing through load, each harmonic electric current of the N subharmonic electric 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 carried out superposition, obtain comprehensive harmonic current, and according to described comprehensive harmonic current, load is compensated;
Wherein N be greater than 1 positive integer.
2. a kind of active filter supply harmonic make-up system according to claim 1, it is characterized in that, described filter unit comprises the first inductance, the 2nd inductance, electric capacity, described first inductance is connected with described 2nd inductance, described first inductance also connects electrical network output terminal, and described Capacitance parallel connection and described first inductance are between described 2nd inductance.
3. a kind of active filter supply harmonic make-up system according to claim 1, it is characterized in that, described filter unit also comprises resistance, described resistance and described capacitances in series, described harmonic wave impedance computation unit for calculate described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
4. an active filter supply harmonic equalising means, it is characterised in that, comprise the following steps:
The each harmonic electric current of the electric current of load is flow through in detection, and each harmonic electric current superposition to the described electric current flowing through load, obtain load harmonic current;
The each harmonic electric current that calculation of filtered circuit produces, and each harmonic electric current superposition produced by described filtering circuit, obtain filtering 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.
5. a kind of active filter supply harmonic equalising means according to claim 1, it is characterised in that, each harmonic electric current that described calculation of filtered circuit produces comprises:
Detect each harmonic voltage of described filtering circuit input terminus;
Detect the impedance that each harmonic voltage of described filtering circuit is corresponding;
The electric current corresponding according to the impedance computation filtering circuit each harmonic that described each harmonic voltage and described each harmonic voltage are corresponding.
6. a kind of active filter supply harmonic equalising means according to claim 5, it is characterized in that, state filtering circuit and comprise the first inductance, the 2nd inductance, electric capacity, described first inductance is connected with described 2nd inductance, described first inductance also connects electrical network output terminal, and described Capacitance parallel connection is between described first inductance and described 2nd inductance.
7. a kind of active filter supply harmonic equalising means according to claim 6, it is characterised in that, described filtering circuit also comprises resistance, described resistance and described capacitances in series;
The impedance that each harmonic voltage of the described filtering circuit of described detection is corresponding is, detect described first inductance, described electric capacity, described inductance composition circuit be impedance during N at harmonic order.
8. a kind of active filter supply harmonic equalising means according to claim 7, it is characterised in that,
Described each harmonic voltage and described each harmonic electric current adopt fft algorithm to calculate, and the calculation formula of humorous wave resistance 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 radian frequency.
9. a kind of active filter supply harmonic equalising means according to claim 8, it is characterized in that, as R=0, the calculation formula of described humorous wave resistance is for calculating impedance of fundamental frequency, and calculate fundamental reactive current according to fundamental voltage and described impedance of fundamental frequency, load is compensated.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106992765A (en) * | 2017-04-18 | 2017-07-28 | 河北工业大学 | The method of the lower reduction inductive circuit impedance value of harmonic current excitation |
| CN108390386A (en) * | 2018-05-18 | 2018-08-10 | 江苏伊莱尔电力科技有限公司 | A kind of Active Power Filter-APF supply harmonic compensation system and method |
| CN113067335A (en) * | 2021-04-12 | 2021-07-02 | 西安麦格米特电气有限公司 | Current compensation method and circuit adopting critical current control strategy |
| CN116260191A (en) * | 2023-05-16 | 2023-06-13 | 北京金风科创风电设备有限公司 | Grid-connected control method, device, equipment and medium of wind generating set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106992765A (en) * | 2017-04-18 | 2017-07-28 | 河北工业大学 | The method of the lower reduction inductive circuit impedance value of harmonic current excitation |
| CN108390386A (en) * | 2018-05-18 | 2018-08-10 | 江苏伊莱尔电力科技有限公司 | A kind of Active Power Filter-APF supply harmonic compensation system and method |
| CN113067335A (en) * | 2021-04-12 | 2021-07-02 | 西安麦格米特电气有限公司 | Current compensation method and circuit adopting critical current control strategy |
| CN116260191A (en) * | 2023-05-16 | 2023-06-13 | 北京金风科创风电设备有限公司 | Grid-connected control method, device, equipment and medium of wind generating set |
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| CN105633969B (en) | 2018-02-16 |
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