CN105375530A - Parallel multi-level APF (active power filter) grid connection method - Google Patents
Parallel multi-level APF (active power filter) grid connection method Download PDFInfo
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- CN105375530A CN105375530A CN201510988715.7A CN201510988715A CN105375530A CN 105375530 A CN105375530 A CN 105375530A CN 201510988715 A CN201510988715 A CN 201510988715A CN 105375530 A CN105375530 A CN 105375530A
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- grid connection
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Control Of Electrical Variables (AREA)
Abstract
A parallel multi-level APF (active power filter) grid connection method comprises steps as follows: a KM2 is connected, and a power unit group is charged; the KM2 is disconnected, and PWM (pulse-width modulation) signals are sent to the power unit group; system voltage ua, ub and uc and device output voltage va, vb and vc are collected; S4, the va, the vb and the vc are subjected to operation by the aid of an adding device, Valpha and Vbeta are obtained, the ua, the ub and the uc are subjected to operation, Ualpha and Ubeta are obtained, and when P which is equal to the sum of Ualpha*Valpha and Ubeta*Vbeta is larger than a set value, phase positions and phase sequences of device CT and system CT are correct; the KM2 is connected, and the pulse of a power electronic device is opened after direct-current side voltage is stable; the pulse of the power electronic device is blocked after the direct-current side voltage is stable; a KM1 is connected; the pulse of the power electronic device is opened, and grid connection is finished. The parallel multi-level APF grid connection method has simple steps and is easy to operate, and when the method is used for judging the phase positions and the phase sequences of device output voltage and system voltage, the accuracy is high.
Description
Technical field
The present invention relates to technical field of electricity, particularly a kind of parallel connection type many level actives filter APF combination method.
Background technology
When power electronic equipment is connected with power distribution network, for making device reliably working, the voltage sent before needing assurance device grid-connected is identical with distribution network voltage phase sequence, frequency is identical, voltage is identical, phase place is identical, thus it is little to realize the grid-connected impact of accurate synchronizing, and motor synchronizing is convenient.The combination method that prior art is not relevant.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of parallel connection type many level actives filter APF combination method, it comprises the following steps:
S1: close KM2, power cell group is charged by the anti-paralleled diode of IGBT/IGCT/MOSFET/IECT;
S2: point KM2, send pwm signal to power cell group;
S3: acquisition system voltage ua, ub, uc and device output voltage va, vb, vc;
S4: obtain V α, V β to va, vb, vc computing by adder, obtains U α, U β to ua, ub, uc computing, when P=U α V α+U β V β is greater than set-point, indication device CT and system CT phase place and phase sequence correct;
S5: close KM2, waits for the pulse of opening power electronic device after direct current surveys voltage stabilization;
S6: the pulse of blocking power electronic device after DC-side Voltage Stabilization;
S7: close KM1;
S8: the pulse of opening power electronic device, grid-connectedly completes.
Preferably, described in
Vα＝Va-1/2(Vb+Vc)，Vβ＝(Vb-Vc)1.732/2
Uα＝Ua-1/2(Ua+Ub)，Uβ＝(Ub-Uc)1.732/2
。
The present invention has following beneficial effect:
Parallel connection type many level actives filter APF combination method step of the present invention is simple, do not need extra PT and oscilloscope, can realize, from dynamic circuit connector phase and grid-connected, easily operating, and the accuracy sending voltage and system voltage phase place by method judgment means of the present invention is high.
Certainly, implement arbitrary product of the present invention might not need to reach above-described all advantages simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described describing the required accompanying drawing used to embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The power electronic equipment principle schematic that Fig. 1 provides for the embodiment of the present invention;
The V α that Fig. 2 provides for the embodiment of the present invention, V β principle of operation figure;
The U α that Fig. 3 provides for the embodiment of the present invention, U β principle of operation figure;
Fig. 4 uses the P principle of operation figure that provides for the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of parallel connection type many level actives filter APF combination method, it comprises the following steps:
S1: close KM2, power cell group is charged by the anti-paralleled diode of IGBT/IGCT/MOSFET/IECT;
S2: point KM2, send pwm signal to power cell group;
S3: acquisition system voltage ua, ub, uc and device output voltage va, vb, vc;
S4: obtain V α, V β to va, vb, vc computing by adder, obtains U α, U β to ua, ub, uc computing, when P=U α V α+U β V β is greater than set-point, indication device CT and system CT phase place and phase sequence correct;
S5: close KM2, waits for the pulse of opening power electronic device after direct current surveys voltage stabilization;
S6: the pulse of blocking power electronic device after DC-side Voltage Stabilization;
S7: close KM1;
S8: the pulse of opening power electronic device, grid-connectedly completes.
Wherein V α=Va-1/2 (Vb+Vc), V β=(Vb-Vc) 1.732/2 as shown in Figure 2
U α=Ua-1/2 (Ua+Ub), U β=(Ub-Uc) 1.732/2 as shown in Figure 3,
As shown in Figure 4, P=U α V α+U β V β.
Parallel connection type many level actives filter APF combination method step of the present invention is simple, easily operates, and the accuracy sending voltage and system voltage phase place by method judgment means of the present invention is high.
The disclosed preferred embodiment of the present invention just sets forth the present invention for helping above.Preferred embodiment does not have all details of detailed descriptionthe, does not limit the embodiment that this invention is only described yet.Obviously, according to the content of this specification, can make many modifications and variations.This specification is chosen and is specifically described these embodiments, is to explain principle of the present invention and practical application better, thus makes art technical staff understand well and to utilize the present invention.The present invention is only subject to the restriction of claims and four corner and equivalent.
Claims (2)
1. parallel connection type many level actives filter APF combination method, is characterized in that, comprise the following steps:
S1: close KM2, power cell group is charged by the anti-paralleled diode of IGBT/IGCT/MOSFET/IECT;
S2: point KM2, send pwm signal to power cell group;
S3: acquisition system voltage ua, ub, uc and device output voltage va, vb, vc;
S4: obtain V α, V β to va, vb, vc computing by adder, obtains U α, U β to ua, ub, uc computing, when P=U α V α+U β V β is greater than set-point, indication device CT and system CT phase place and phase sequence correct;
S5: close KM2, waits for the pulse of opening power electronic device after direct current surveys voltage stabilization;
S6: the pulse of blocking power electronic device after DC-side Voltage Stabilization;
S7: close KM1;
S8: the pulse of opening power electronic device, grid-connectedly completes.
2. parallel connection type many level actives filter APF combination method as claimed in claim 1, is characterized in that, described in
Vα＝Va-1/2(Vb+Vc)，Vβ＝(Vb-Vc)1.732/2
Uα＝Ua-1/2(Ua+Ub)，Uβ＝(Ub-Uc)1.732/2
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510988715.7A CN105375530B (en) | 2015-12-24 | 2015-12-24 | The many level active filter APF combination methods of parallel connection type |
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|---|---|---|---|
| CN201510988715.7A CN105375530B (en) | 2015-12-24 | 2015-12-24 | The many level active filter APF combination methods of parallel connection type |
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| CN105375530A true CN105375530A (en) | 2016-03-02 |
| CN105375530B CN105375530B (en) | 2017-08-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11136864A (en) * | 1997-10-28 | 1999-05-21 | Matsushita Electric Works Ltd | System linkage inverter device |
| CN102148492A (en) * | 2010-12-21 | 2011-08-10 | 中国电力科学研究院 | Method for acquiring control input signal of subsynchronous oscillation suppression and control device |
| CN102611108A (en) * | 2012-03-09 | 2012-07-25 | 湖南大学 | Three-level three-phase four-wire active power filter and control method thereof |
| CN102684193A (en) * | 2011-12-15 | 2012-09-19 | 安徽省歙县科祺光伏有限公司 | Mixed type active filter |
| CN104505862A (en) * | 2014-12-31 | 2015-04-08 | 上海交通大学 | Micro-grid pre-synchronization control method based on mater-slave structure |
| CN104617581A (en) * | 2015-03-05 | 2015-05-13 | 太原理工大学 | Soft-start control method of four-bridge arm active power filter |
-
2015
- 2015-12-24 CN CN201510988715.7A patent/CN105375530B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11136864A (en) * | 1997-10-28 | 1999-05-21 | Matsushita Electric Works Ltd | System linkage inverter device |
| CN102148492A (en) * | 2010-12-21 | 2011-08-10 | 中国电力科学研究院 | Method for acquiring control input signal of subsynchronous oscillation suppression and control device |
| CN102684193A (en) * | 2011-12-15 | 2012-09-19 | 安徽省歙县科祺光伏有限公司 | Mixed type active filter |
| CN102611108A (en) * | 2012-03-09 | 2012-07-25 | 湖南大学 | Three-level three-phase four-wire active power filter and control method thereof |
| CN104505862A (en) * | 2014-12-31 | 2015-04-08 | 上海交通大学 | Micro-grid pre-synchronization control method based on mater-slave structure |
| CN104617581A (en) * | 2015-03-05 | 2015-05-13 | 太原理工大学 | Soft-start control method of four-bridge arm active power filter |
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