CN103633655A - Public bus energy exchange-based H-bridge cascade topological structured SSSC (static synchronous suppressed carrier) device - Google Patents
Public bus energy exchange-based H-bridge cascade topological structured SSSC (static synchronous suppressed carrier) device Download PDFInfo
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- CN103633655A CN103633655A CN201310585593.8A CN201310585593A CN103633655A CN 103633655 A CN103633655 A CN 103633655A CN 201310585593 A CN201310585593 A CN 201310585593A CN 103633655 A CN103633655 A CN 103633655A
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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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The invention relates to a static synchronous cascade compensator in the field of power electronics, in particular to a public bus energy exchange-based H-bridge cascade topological structured SSSC (static synchronous suppressed carrier) device. The device is connected with an H-bridge link unit controller and comprises N cascade H-bridge link units and a public bus; the N H-bridge link units are connected with the public bus. The invention provides the public alternating current bus and public direct current bus energy exchange-based H-bridge cascade SSSC topological structure and the SSSC is started in a separated excitation mode. The device can effectively avoid the imbalanced direct current voltage, so the SSSC can be normally started under various work conditions, the operation stability of the device under the condition of the fault of a power grid is improved and the link unit controller is conveniently powered.
Description
Technical field
The present invention relates to the STATCOM of field of power electronics, be specifically related to a kind of SSSC device of the H bridge Cascade Topology Structure structure based on common bus energy exchange.
Background technology
Static Series Synchronous Compensator SSSC is mainly comprised of current transformer, DC capacitor, controller and coupling transformer, through over-coupled transformer, is connected on transmission line.Basic principle is to circuit, to inject one to differ the sinusoidal controllable voltage of 90 ° with its current phase, and can change flexibly amplitude and phase place, fraction injecting voltage and line current are in order to compensate the loss of inverter, most of injecting voltage plays the effect of capacitive or emotional resistance in series circuit, be equivalent to can quick adjustment equiva lent impedance, thereby realize, system is controlled, had good operation and dynamic property.
The topological structure of SSSC is varied, and the tandem type SSSC topological structure of prior art as shown in Figure 3, comprises traditional three-phase bridge structure, multiple inverter configuration, H bridge tandem type structure etc.Three-phase bridge structure is suitable for the device that capacity is less, is not suitable under large capacity high condition and applies; Multiple inverter configuration adopts multiplex transformer, and this scheme exists the problems such as volume of transformer is large, cost is high, running wastage is large.H bridge tandem type structure is suitable for high-voltage large-capacity SSSC, but because the time delay of triggering signal is different with each H bridge loss, the change of current chain of SSSC there will be direct voltage uneven, controls comparatively complexity, when there is departure, can impact AC output.
Summary of the invention
For avoiding the unbalanced problem of H bridge chain section DC capacitor, the SSSC device that the object of this invention is to provide a kind of H bridge Cascade Topology Structure structure based on common bus energy exchange, this device can effectively avoid direct voltage unbalanced, SSSC all can normally be started under various operating modes, improved the device operation stability in electric network fault situation, facilitated as link units power supply simultaneously.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of SSSC device of the H bridge Cascade Topology Structure structure based on common bus energy exchange, described SSSC is STATCOM, adopt H bridge tandem type structure, its improvements are, described device is connected with H bridge chain section cell controller, described device comprises H bridge chain section unit and the common bus of N cascade, and described N H bridge chain section unit is all connected with common bus.
Further, when common bus is public exchange bus, described H bridge chain section unit comprises H bridge chain section and isolating transformer, in the direct current capacitor side of described H bridge chain section, is parallel with rectifier, and described rectifier is connected with public exchange bus by isolating transformer; Described direct current capacitor starts by rectifier charging, and for maintaining the DC voltage balance of H bridge chain section unit.
Further, described H bridge chain section comprises four brachium pontis, and described four brachium pontis form by IGBT module, and described IGBT module is comprised of IGBT device and diode antiparallel with it.
Further, when common bus is common DC bus, described H bridge chain section unit comprises H bridge chain section and DC/DC current transformer, and the direct current capacitor of described H bridge chain section is connected with common DC bus by DC/DC current transformer; Described direct current capacitor passes through DC/DC current transformer charge initiation, and for maintaining the DC voltage balance of H bridge chain section unit.
Further, described H bridge chain section comprises four brachium pontis, and described four brachium pontis form by IGBT module, and described IGBT module is comprised of IGBT device and diode antiparallel with it.
Further, described device is the power supply of H bridge chain section unit, and adopts common bus energy exchange to control DC capacitor voltage.
Further, Static Series Synchronous Compensator SSSC device is in series with on the transmission line of reactor as the access of reactive voltage source, its injecting voltage
with line current
90 ° of phase angle differences;
When carrying out capacitive compensation, injecting voltage
90 ° of hysteresis line currents, with the voltage drop opposite direction in line impedance, increase the amplitude of line current, in the situation that not changing merit angular difference, circuit transmission power are increased;
When carrying out perception compensation, injecting voltage
90 ° of leading line currents, identical with the voltage drop direction in line impedance, the amplitude of line current is reduced, and then reduce transmission power.
Compared with the prior art, the beneficial effect that the present invention reaches is:
(1) device provided by the invention solves the unbalanced problem of H bridge chain section DC capacitor, can effectively avoid direct voltage unbalanced, SSSC all can normally be started under various operating modes, improved the device operation stability in electric network fault situation, facilitate as the power supply of link units controller simultaneously, direct voltage is balanced, makes H bridge output AC voltage stable.
(2) the separate excitation Starting mode of SSSC can start smoothly when line voltage is lower;
(3) mode by public (exchanging and direct current) bus rectifier power supply has improved the device operation stability in SSSC electric network fault situation;
(4) by the mode of public (exchanging and direct current) bus rectifier power supply, facilitate the energy of getting of link units controller, do not need other extraneous power supply, conveniently get energy.
Accompanying drawing explanation
Fig. 1 is SSSC connecting system schematic diagram provided by the invention;
Fig. 2 (a) is the uncompensated vectogram of SSSC provided by the invention;
Fig. 2 (b) is the vectogram of SSSC capacitive compensation provided by the invention;
Fig. 2 (c) is the vectogram of SSSC perception provided by the invention compensation;
Fig. 3 is the tandem type SSSC topological structure of prior art;
Fig. 4 is the H bridge tandem type SSSC topological structure schematic diagram based on the energy exchange of public exchange bus provided by the invention;
Fig. 5 is the H bridge tandem type SSSC topological structure schematic diagram based on common DC bus energy exchange provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
SSSC device provided by the invention adopts common bus energy exchange to control H bridge chain section direct voltage.STATCOM SSSC device is in series with on the transmission line of reactor as reactive voltage source access, SSSC connecting system schematic diagram as shown in Figure 1, its injecting voltage
with line current
90 ° of phase angle differences; The control of voltage magnitude is not subject to the impact of line current.During capacitive compensation, injecting voltage
90 ° of hysteresis line currents, with the voltage drop opposite direction in line impedance, increase the amplitude of line current, thereby in the situation that not changing merit angular difference, circuit transmission power are increased; During perception compensation, injecting voltage
90 ° of leading line currents, identical with the voltage drop direction in line impedance, the amplitude of line current is reduced, thereby transmission power is reduced.A in Fig. 2, b, it is uncompensated that c is respectively, vectogram when capacitive compensation and perception compensation.
Described device is connected with H bridge chain section cell controller, and described device comprises H bridge chain section unit and the common bus of N cascade, and described N H bridge chain section unit is all connected with common bus.Described N >=2.
When common bus is public exchange bus, described H bridge chain section unit comprises H bridge chain section and isolating transformer, in the direct current capacitor side of described H bridge chain section, is parallel with rectifier, and described rectifier is connected with public exchange bus by isolating transformer; Described direct current capacitor starts by rectifier charging, and for maintaining the DC voltage balance of H bridge chain section unit.H bridge topological structure based on the energy exchange of public exchange bus as shown in Figure 4.
This kind of structure do not need to measure direct voltage, automatically realizes direct voltage balanced by DC capacitor and energy exchange between ac bus, simplified sampled point and control flow.SSSC all can normally be started under various operating modes, improved the device operation stability in electric network fault situation, facilitate as the power supply of link units controller simultaneously.
When common bus is common DC bus, described H bridge chain section unit comprises H bridge chain section and DC/DC current transformer, and the direct current capacitor of described H bridge chain section is connected with common DC bus by DC/DC current transformer; Described direct current capacitor passes through current transformer charge initiation, and for maintaining the DC voltage balance of H bridge chain section unit.H bridge tandem type SSSC topological structure based on common DC bus energy exchange as shown in Figure 5.
This kind of structure with based on public exchange bus SSSC topological structure, compare, saved isolating transformer, the mode of connection is simple, reaches the object of dc-voltage balance simultaneously.
Described H bridge chain section comprises four brachium pontis, and described four brachium pontis form by IGBT module, and described IGBT module is comprised of IGBT device and diode antiparallel with it.
The invention provides the H bridge tandem type SSSC topological structure based on public exchange bus and common DC bus energy exchange, SSSC, by separate excitation Starting mode, can realize by common bus energy exchange the direct voltage equilibrium of SSSC.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. the SSSC device of the H bridge Cascade Topology Structure structure based on common bus energy exchange, described SSSC is STATCOM, adopt H bridge tandem type structure, it is characterized in that, described device is connected with H bridge chain section cell controller, described device comprises H bridge chain section unit and the common bus of N cascade, and described N H bridge chain section unit is all connected with common bus.
2. the SSSC device of H bridge Cascade Topology Structure structure as claimed in claim 1, it is characterized in that, when common bus is public exchange bus, described H bridge chain section unit comprises H bridge chain section and isolating transformer, direct current capacitor side at described H bridge chain section is parallel with rectifier, and described rectifier is connected with public exchange bus by isolating transformer; Described direct current capacitor starts by rectifier charging, and for maintaining the DC voltage balance of H bridge chain section unit.
3. the SSSC device of H bridge Cascade Topology Structure structure as claimed in claim 2, it is characterized in that, described H bridge chain section comprises four brachium pontis, and described four brachium pontis form by IGBT module, and described IGBT module is comprised of IGBT device and diode antiparallel with it.
4. the SSSC device of H bridge Cascade Topology Structure structure as claimed in claim 1, it is characterized in that, when common bus is common DC bus, described H bridge chain section unit comprises H bridge chain section and DC/DC current transformer, and the direct current capacitor of described H bridge chain section is connected with common DC bus by DC/DC current transformer; Described direct current capacitor passes through DC/DC current transformer charge initiation, and for maintaining the DC voltage balance of H bridge chain section unit.
5. the SSSC device of H bridge Cascade Topology Structure structure as claimed in claim 4, it is characterized in that, described H bridge chain section comprises four brachium pontis, and described four brachium pontis form by IGBT module, and described IGBT module is comprised of IGBT device and diode antiparallel with it.
6. the SSSC device of the H bridge Cascade Topology Structure structure as described in any one in claim 1-5, is characterized in that, described device is the power supply of H bridge chain section unit, and adopts common bus energy exchange to control DC capacitor voltage.
7. the SSSC device of the H bridge Cascade Topology Structure structure as described in any one in claim 1-5, is characterized in that, Static Series Synchronous Compensator SSSC device is in series with on the transmission line of reactor as the access of reactive voltage source, its injecting voltage
with line current
90 ° of phase angle differences;
When carrying out capacitive compensation, injecting voltage
90 ° of hysteresis line currents, with the voltage drop opposite direction in line impedance, increase the amplitude of line current, in the situation that not changing merit angular difference, circuit transmission power are increased;
When carrying out perception compensation, injecting voltage
90 ° of leading line currents, identical with the voltage drop direction in line impedance, the amplitude of line current is reduced, and then reduce transmission power.
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| CN201310585593.8A CN103633655A (en) | 2013-11-19 | 2013-11-19 | Public bus energy exchange-based H-bridge cascade topological structured SSSC (static synchronous suppressed carrier) device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108599219A (en) * | 2018-01-29 | 2018-09-28 | 太原理工大学 | A kind of chain type STATCOM DC bus-bar voltage control device and methods |
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Application publication date: 20140312 |