CN104022670A - Capacity-expandable three-phase H-bridge current source STATCOM device - Google Patents
Capacity-expandable three-phase H-bridge current source STATCOM device Download PDFInfo
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- CN104022670A CN104022670A CN201410268782.7A CN201410268782A CN104022670A CN 104022670 A CN104022670 A CN 104022670A CN 201410268782 A CN201410268782 A CN 201410268782A CN 104022670 A CN104022670 A CN 104022670A
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Abstract
The invention discloses a capacity-expandable three-phase H-bridge current source STATCOM device which comprises three H-bridge current source inversion power modules, a control circuit for generating PWM signals, a filter circuit and a load, wherein each H-bridge current source inversion power module is composed of one or more H-bridge current source inversion circuits connected in parallel, and the capacity of inverters can be expanded. Due to the fact that large inductors are connected to the direct current power supply sides of the current-type inverters, under the condition that the current direction is kept unchanged, the direction of the output current can be changed according to a switching sequence of two bridge arms of each H bridge, and bidirectional power conversion can be easily achieved.
Description
Technical field
The present invention relates to a kind of three-phase H bridge current source STATCOM device of expanding capacity, belong to electric automatization equipment technical field.
Background technology
At present, all based on voltage-source type inverse type with external come into operation STATCOM (STATCOM) at home, the inverter of voltage support is provided by DC bus capacitor, voltage official post STATCOM by between control inverter output voltage and system voltage absorb or send idle, thereby reach the object of idle adjusting.The easy overcurrent of voltage source inverter, device easily cause while being short-circuited that fault, the compensation capacities such as power network fluctuation flickering are not easy expansion.For the startup of converter, voltage source inverter needs extra startup current-limiting circuit or starts charging circuit.Current source inverter is due to the existence of AC capacitor, and power semiconductor can not bear higher voltage change ratio, and voltage source inverter is if do not taked certain safeguard measure, may produce higher voltage change ratio.
Summary of the invention
The invention provides a kind of three-phase H bridge current source STATCOM device of expanding capacity, the inductance by DC side is controlled electric current and STATCOM is absorbed and send idlely, reaches and regulates idle object.
The technical solution adopted in the present invention is as follows:
A three-phase H bridge current source STATCOM device of expanding capacity, comprises three H bridge current source inverter power models, control circuit, filter circuit and load; Described each H bridge current source inverter power model is composed in parallel by 1 or a plurality of H bridge current source inverter circuit; The output of described three H bridge current source inverter power models is in parallel with three phase network; Described three equal access control circuit of H bridge current source inverter power model; Described control circuit is for generation of pwm signal; Described filter circuit is comprised of three electric capacity, and three electric capacity are connected in parallel on respectively on three phase network; Described load is connected in parallel on three phase network.
Aforesaid each H bridge current source inverter circuit consists of 4 IGBT power devices without parasitic diode, the gate electrode drive signals of described each IGBT power device is connected respectively to the pwm signal output port of control circuit, and the DC side of described each H bridge current source inverter circuit connects an inductance.
The neutral point of aforesaid H bridge current source inverter power model and the neutral point of filter circuit are connected, and form three-phase three-wire system H bridge current source STATCOM device.
The neutral point of neutral point, the neutral point of filter circuit, the neutral point of load and the electrical network of aforesaid H bridge current source inverter power model is connected, and forms three-phase four-wire system current source STATCOM device.
The advantage that the present invention has is:
1) current source inverter is owing to connecting large inductance in its direct current supply side, maintaining the sense of current constant in the situation that, and two brachium pontis of H bridge can change output current direction by switching sequence, so be easy to realize the two-way changing of power;
2) each H bridge current source inverter power model can be composed in parallel by a plurality of H bridge current source inverter circuit, and capacity extension is very convenient, on engineering construction, can drop into according to load condition by stages;
3) current source inverter is equivalent to current source because of self, can not be short-circuited and the fault such as overcurrent, so current source inverter does not exist overcurrent and short-circuit protection, and general voltage source inverter device is difficulty comparatively.
Accompanying drawing explanation
Fig. 1 three-phase three-wire system H of the present invention bridge current source STATCOM device schematic diagram;
Fig. 2 is three-phase four-wire system H bridge current source STATCOM device schematic diagram of the present invention;
Fig. 3 is the single H bridge of the present invention current source inverter circuit diagram;
Fig. 4 is several H bridge current source inverter circuit parallel-connection structure schematic diagrames of the present invention.
Embodiment
Now describe the present invention in detail with embodiment by reference to the accompanying drawings.
H bridge current source STATCOM device of the present invention comprises three H bridge current source inverter power models, produces control circuit, filter circuit and the load of pwm signal.
As shown in Figure 4, each H bridge current source inverter power model is composed in parallel by 1 or a plurality of H bridge current source inverter circuit, as shown in Figure 3, each H bridge current source inverter circuit consists of 4 IGBT power devices without parasitic diode, the gate electrode drive signals of each IGBT power device is connected respectively to the pwm signal output port of control circuit, and the DC side of each H bridge current source inverter circuit connects an inductance L.In Fig. 1 and Fig. 2, three H bridge current source inverter power models are respectively by 1 H bridge current source inverter the electric circuit constitute, the H bridge current source inverter circuit of inverted power module A is by IGBT power device Ta1, IGBT power device Ta2, IGBT power device Ta3 and IGBT power device Ta4 form H bridge, and the pwm signal output port of the equal access control circuit of the gate electrode drive signals of four IGBT power devices, the direct current supply side of inverter circuit connects inductance L; The H bridge current source inverter circuit of inverted power module B is by IGBT power device Tb1, IGBT power device Tb2, IGBT power device Tb3 and IGBT power device Tb4 form H bridge, and the pwm signal output port of the equal access control circuit of the gate electrode drive signals of four IGBT power devices, the direct current supply side of inverter circuit connects inductance L; The H bridge current source inverter circuit of inverted power module C is by IGBT power device Tc1, IGBT power device Tc2, IGBT power device Tc3 and IGBT power device Tb4 form H bridge, and the pwm signal output port of the equal access control circuit of the gate electrode drive signals of four IGBT power devices, the direct current supply side of inverter circuit connects inductance L.The parallel connection of a plurality of H bridge current source inverter circuit can be expanded inverter capacity.The output of three H bridge current source inverter power models is in parallel with three phase network.
Filter circuit is comprised of three electric capacity, and capacitor C 1 as in Figure 1 and Figure 2, and 3, three electric capacity of capacitor C 2 and capacitor C are connected in parallel on three phase network respectively.The harmonic current that filter circuit can filtering inverted power module produces, simultaneously for current in middle wire provides loop.
Load is connected in parallel on three phase network.
In the present invention, the neutral point 01 of H bridge current source inverter power model and the neutral point 02 of filter circuit being connected, can structure be three-phase three-wire system H bridge current source STATCOM device, as shown in Figure 1.
The neutral point 04 of the neutral point 03 of the neutral point 02 of the neutral point 01 of H bridge current source inverter power model, filter circuit, load and electrical network is connected, can forms three-phase four-wire system current source STATCOM device, as shown in Figure 2.
Operation principle of the present invention is:
Control circuit detects load and STATCOM three-phase current, produces instruction current, and send the pwm signal of power model by calculating.
H bridge current source inverter power model DC side adopts large inductance, when STATCOM output current is
i d time, open IGBT power device Ta1, Ta4, IGBT power device Tb1, Tb4, IGBT power device Tc1, Tc4, electrical network charges to inductance L by IGBT power device.
When STATCOM output current be-
i d time, open IGBT power device Ta2, Ta3, IGBT power device Tb2, Tb3, IGBT power device Tc2, Tc3, electrical network charges to inductance L by IGBT power device.
When STATCOM output current from
i d become at 0 o'clock, open IGBT power device Ta1, Ta3, IGBT power device Tb1, Tb3, IGBT power device Tc1, Tc3; When STATCOM output current from-
i d become at 0 o'clock, open IGBT power device Ta2, Ta4, IGBT power device Tb2, Tb4, IGBT power device Tc2, Tc4, inductance L is discharged by IGBT power device.
For three-phase three-wire circuit, when due to device or control that difference causes three-phase current that STATCOM sends and when non-vanishing, three-phase current sum flows into filter circuit neutral point from STATCOM neutral point, provides path to electric power.
For three-phase four-line system, three-phase STATCOM can export the power network current imbalance that unsymmetrical current comes compensating load to cause.
Claims (4)
1. the three-phase H bridge current source STATCOM device that can expand capacity, is characterized in that, comprises three H bridge current source inverter power models, control circuit, filter circuit and load; Described each H bridge current source inverter power model is composed in parallel by 1 or a plurality of H bridge current source inverter circuit; The output of described three H bridge current source inverter power models is in parallel with three phase network; Described three equal access control circuit of H bridge current source inverter power model; Described control circuit is for generation of pwm signal; Described filter circuit is comprised of three electric capacity, and three electric capacity are connected in parallel on respectively on three phase network; Described load is connected in parallel on three phase network.
2. a kind of three-phase H bridge current source STATCOM device of expanding capacity according to claim 1, it is characterized in that, described each H bridge current source inverter circuit consists of 4 IGBT power devices without parasitic diode, the gate electrode drive signals of described each IGBT power device is connected respectively to the pwm signal output port of control circuit, and the DC side of described each H bridge current source inverter circuit connects an inductance.
3. a kind of three-phase H bridge current source STATCOM device of expanding capacity according to claim 1, it is characterized in that, the neutral point of described H bridge current source inverter power model and the neutral point of filter circuit are connected, and form three-phase three-wire system H bridge current source STATCOM device.
4. a kind of three-phase H bridge current source STATCOM device of expanding capacity according to claim 1, it is characterized in that, the neutral point of neutral point, the neutral point of filter circuit, the neutral point of load and the electrical network of described H bridge current source inverter power model is connected, and forms three-phase four-wire system current source STATCOM device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410268782.7A CN104022670A (en) | 2014-06-16 | 2014-06-16 | Capacity-expandable three-phase H-bridge current source STATCOM device |
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| CN201410268782.7A CN104022670A (en) | 2014-06-16 | 2014-06-16 | Capacity-expandable three-phase H-bridge current source STATCOM device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538977A (en) * | 2015-01-06 | 2015-04-22 | 东南大学 | Static synchronous compensation device |
| CN110556870A (en) * | 2019-10-17 | 2019-12-10 | 国网黑龙江省电力有限公司电力科学研究院 | Multifunctional non-isolated converter device for distribution network level distributed new energy grid connection |
| CN115513969A (en) * | 2022-11-22 | 2022-12-23 | 四川大学 | Low-capacitance cascaded H-bridge STATCOM and switch modulation and control method thereof |
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| US7518891B2 (en) * | 2005-08-02 | 2009-04-14 | Rockwell Automation Technologies, Inc. | Auxiliary circuit for use with three-phase drive with current source inverter powering a single-phase load |
| CN101908830A (en) * | 2010-06-02 | 2010-12-08 | 黑龙江科技学院 | 25 space vector-based current type multi-level inverter and control method thereof |
| CN103401453A (en) * | 2013-07-30 | 2013-11-20 | 浙江大学宁波理工学院 | Three-phase current type multi-level converter topology structure |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7518891B2 (en) * | 2005-08-02 | 2009-04-14 | Rockwell Automation Technologies, Inc. | Auxiliary circuit for use with three-phase drive with current source inverter powering a single-phase load |
| CN101908830A (en) * | 2010-06-02 | 2010-12-08 | 黑龙江科技学院 | 25 space vector-based current type multi-level inverter and control method thereof |
| CN103401453A (en) * | 2013-07-30 | 2013-11-20 | 浙江大学宁波理工学院 | Three-phase current type multi-level converter topology structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538977A (en) * | 2015-01-06 | 2015-04-22 | 东南大学 | Static synchronous compensation device |
| CN110556870A (en) * | 2019-10-17 | 2019-12-10 | 国网黑龙江省电力有限公司电力科学研究院 | Multifunctional non-isolated converter device for distribution network level distributed new energy grid connection |
| CN115513969A (en) * | 2022-11-22 | 2022-12-23 | 四川大学 | Low-capacitance cascaded H-bridge STATCOM and switch modulation and control method thereof |
| CN115513969B (en) * | 2022-11-22 | 2023-03-24 | 四川大学 | Low-capacitance cascaded H-bridge STATCOM and switch modulation and control method thereof |
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Application publication date: 20140903 |