CN101170259A - DC voltage balance control system for mixed multi-level static synchronization compensator - Google Patents
DC voltage balance control system for mixed multi-level static synchronization compensator Download PDFInfo
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- CN101170259A CN101170259A CNA2007101503949A CN200710150394A CN101170259A CN 101170259 A CN101170259 A CN 101170259A CN A2007101503949 A CNA2007101503949 A CN A2007101503949A CN 200710150394 A CN200710150394 A CN 200710150394A CN 101170259 A CN101170259 A CN 101170259A
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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]
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
A DC voltage balance control system for a composite multi-level static synchronous compensator is characterized in that the system comprises a rectification circuit, DC energy storage units, a protection circuit, a composite nine-level inverter, a DC isolation unit and a three-coil isolation transformer. The invention has the advantages: 1. the system adopts a composite multi-level structure as the main circuit topology of STATCOM, integrates the advantages of the clamp-type and the cascade-type capacitor structures, improves the capacity of the device, reduces necessary components, and provides convenience in packaging and redundant running, so as to achieve reactive compensation; 2. the system can fulfill automatic balance for the voltage on the DC energy storage units, so that the voltage on two DC voltage-dividing capacitors remains consistent and equals half of the output voltage of the rectification circuit; therefore, switch components in the composite multi-level inverter can adopt low-voltage and small-current power components.
Description
(1) technical field:
The invention belongs to electric power system STATCOM (STATCOM) equipment technical field, particularly a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator.
(2) background technology:
Power industry is the extensive use field of STATCOM as mainstay of the national economy industry.STATCOM can realize quickly and smoothly absorbing the purpose of perception and capacitive reactive power in electric power system, it has advantages such as the starting nothing is impacted, regulated continuously, response is quick, floor space is little, all has very big advantage at aspects such as regulating system voltage, correcting power factors, balanced load, filtering harmonic waves, having become reactive power compensator of new generation with keen competition at present, is one of important composition parts of flexible AC transmitting system (FACTS).The main circuit of STATCOM device generally adopts multiple inverter configuration or many level structure.Wherein, many level structure is divided into three kinds of diode clamp formula, capacitor-clamped formula and tandem types again.The mixed multi-level structure combines the characteristics of capacitor-clamped formula and tandem type, has following advantage: 1) level number is many more, and harmonic wave of output voltage content is few more; 2) can realize the equilibrating compensation of unbalanced load; 3) with respect to traditional many level structure, required device reduces at double, is easy to encapsulation; 4) realize redundancy running easily; 5) meritorious all controlled with reactive power flow, thereby can be used for high voltage direct current transmission and frequency control.One of key technology of mixed multi-level STATCOM device is the Balance Control of its each capacitor-clamped inversion unit dc voltage.
(3) summary of the invention:
The objective of the invention is to propose a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator, make power device of inverter can adopt the device for power switching of low voltage small electric current capacity, thereby reduce the cost of inverter in the mixed multi-level static synchronization compensator greatly.
Technical scheme of the present invention: a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator is characterized in that this system is made up of rectification circuit, dc energy storage unit, protective circuit, mixing nine electrical level inverters, DC-isolation unit and three winding isolation transformers; Said rectification circuit output end connects two dc energy storage units, and total direct voltage that rectification circuit is exported is divided into two direct voltage sources, is connected with a capacitor-clamped three-level inverter circuit by a protective circuit respectively then; Two synthetic one of tri-level inversion circuit bank are mixed nine electrical level inverters; Two inverter circuit outputs connect a DC-isolation unit respectively, and its ac output voltage is coupled into an alternating voltage by three winding isolation transformers.
Rectifier bridge and smoothing reactor that above-mentioned said rectification circuit is a direct voltage by one group of AC voltage conversion with collection constitute; Direct voltage is connected to the charging input end of dc energy storage unit through smoothing reactor.
Above-mentioned said dc energy storage unit is made of dc partial voltage electric capacity and auxiliary control circuit; Two dc energy storage units are divided into two direct voltage sources with total direct voltage of rectification circuit output, two dc partial voltage electric capacity one ends wherein link together the direct current negative terminal that is parallel to first inverter circuit and the direct current anode of second inverter circuit, the other end is received respectively on DC power supply positive bus-bar and the DC power supply negative busbar.
Above-mentioned said protective circuit is made of IGBT, diode and absorption circuit; The diode inverse parallel absorbs circuit and IGBT and is connected in parallel at the two ends of IGBT; The drain electrode of the negative electrode of diode and IGBT is connected to the direct current anode of first inverter circuit in first protective circuit, and the source electrode of the anode of diode and IGBT is connected to the direct current negative terminal of second inverter circuit in second protective circuit.
Above-mentioned said mixing nine electrical level inverters are made of two tri-level inversion circuits cascadings; Between the tandem tap device of each inverter circuit clamping capacitance is arranged all; The direct current negative terminal of first inverter circuit is received the direct current anode of second inverter circuit and the intermediate interconnection node of two dc partial voltage electric capacity.
No. 2 terminals of preceding two windings are received the right ac output end of two inverter circuits respectively in three winding isolation transformers of the inverter circuit output in the above-mentioned said mixing nine electrical level inverters part, and the 3rd winding is connected to output in the electric power system; No. 1 terminals of preceding two windings are end of the same name.
Above-mentioned said DC-isolation unit is used for the DC component of the square wave alternating-current voltage of inverter circuit output is filtered out by one, constitutes to prevent the saturated DC-isolation electric capacity of isolating transformer; DC-isolation electric capacity one end in two DC-isolation unit is received the left ac output end of two inverter circuits respectively; The other end is received No. 1 terminals of preceding two windings in three winding isolation transformers respectively.
Operation principle of the present invention is: rectification circuit is a direct voltage with the AC voltage conversion of gathering.Two dc energy storage units are divided into the direct voltage source that two voltages equate with total direct voltage of rectification circuit output, and auxiliary control circuit wherein is used to prevent the voltage fluctuation of two dc partial voltage electric capacity.Two protective circuits are used for the charging current size of control dc bus capacitor when inverter circuit works in rectifier system, prevent overcurrent; IGBT current tail can occur when turn-offing, and the absorption electric capacity in the absorption circuit can weaken the inhibitory action to turn-off power loss.Two electric capacity clamper tri-level inversion circuit are realized from direct current to the transformation that exchanges, two DC-isolation electric capacity that its ac output end connects are used for the DC component of the square wave alternating-current voltage of two inverter circuit outputs is filtered out, and are saturated to prevent isolating transformer.At last by one three winding isolation transformer with two square wave alternating-current voltage isolation, be coupled into an alternating voltage and output in the electric power system.
Superiority of the present invention is: 1, adopt the main circuit topology of mixed multi-level structure as STATCOM, combine the advantage of capacitor-clamped formula and tandem type structure, not only improved installed capacity greatly, and required device reduces at double, be easy to encapsulation, also be convenient to redundancy running, can reach the purpose of reactive power compensation well; 2, DC voltage balance control system can be realized the function of voltage swing on the autobalance dc energy storage unit, make two voltages on the dc partial voltage electric capacity keep identical and be half of Output Voltage in Rectified Circuits, thereby make the switching device of mixed multi-level inverter can adopt the power device of the little electric current of low pressure.As when total DC power supply voltage is no more than 2500V, the switching device of mixed multi-level inverter can be selected the IGBT module of 1700V/50A for use, thereby greatly reduces the cost of two-way inverter.
(4) description of drawings:
Accompanying drawing 1 is the related a kind of overall structure block diagram that is used for the DC voltage balance control system of mixed multi-level static synchronization compensator of the present invention.
Accompanying drawing 2 is the related a kind of rectification circuit structure chart that is used for the DC voltage balance control system of mixed multi-level static synchronization compensator of the present invention.
Accompanying drawing 3 is the related a kind of dc energy storage unit auxiliary control circuit structure chart that is used for the DC voltage balance control system of mixed multi-level static synchronization compensator of the present invention.
Accompanying drawing 4 is the related a kind of protective circuit structure chart that is used for the DC voltage balance control system of mixed multi-level static synchronization compensator of the present invention.
Accompanying drawing 5 is the related a kind of mixing nine electrical level inverter structure charts that are used for the DC voltage balance control system of mixed multi-level static synchronization compensator of the present invention.
(5) embodiment:
Embodiment: a kind of DC voltage balance control system (see figure 1) that is used for mixed multi-level static synchronization compensator is characterized in that this system is made up of rectification circuit, dc energy storage unit, protective circuit, mixing nine electrical level inverters, DC-isolation unit and three winding isolation transformers; Said rectification circuit output end connects two dc energy storage units, and total direct voltage that rectification circuit is exported is divided into two direct voltage sources, is connected with a capacitor-clamped three-level inverter circuit by a protective circuit respectively then; Two synthetic one of tri-level inversion circuit bank are mixed nine electrical level inverters; Two inverter circuit outputs connect a DC-isolation unit respectively, and its ac output voltage is coupled into an alternating voltage by three winding isolation transformers.
Above-mentioned said rectification circuit (see figure 2) is made of one group of rectifier bridge (D1, D2, D3, D4) and smoothing reactor L; Rectifier bridge is a direct voltage with the AC voltage conversion of gathering, and direct voltage is the dc energy storage unit charging through the input that smoothing reactor L is connected to dc energy storage unit.
Above-mentioned said dc energy storage unit (see figure 3) is made of dc partial voltage capacitor C 1, C2 and an auxiliary control circuit; Two dc energy storage units are divided into two direct voltage sources with total direct voltage of rectification circuit output, two dc partial voltage capacitor C 1 wherein and C2 one end link together the direct current negative terminal that is parallel to first inverter circuit and the direct current anode of second inverter circuit, the other end is received respectively on DC power supply positive bus-bar and the DC power supply negative busbar.
Above-mentioned said protective circuit (see figure 4) is made of IGBT, diode D5, D6 and absorption circuit; Diode D5, D6 inverse parallel absorb circuit and IGBT and are connected in parallel at the two ends of IGBT; The drain electrode of the negative electrode of diode D1 and IGBT is connected to the direct current anode of first inverter circuit in first protective circuit, and the source electrode of the anode of diode D2 and IGBT is connected to the direct current negative terminal of second inverter circuit in second protective circuit.
Above-mentioned said mixing nine electrical level inverter (see figure 5)s are made of two tri-level inversion circuits cascadings; Between the tandem tap device of each inverter circuit clamping capacitance C5, C6, C7, C8 are arranged all; The direct current negative terminal of first inverter circuit is received the direct current anode of second inverter circuit and the intermediate interconnection node of two dc partial voltage electric capacity.
No. 2 terminals of preceding two windings are received the right ac output end of two inverter circuits respectively in three winding isolation transformers of the inverter circuit output in the above-mentioned said mixing nine electrical level inverters part, and the 3rd winding is connected to output in the electric power system; No. 1 terminals of preceding two windings are end of the same name.
Above-mentioned said DC-isolation unit is used for the DC component of the square wave alternating-current voltage of inverter circuit output is filtered out by one, constitutes to prevent the saturated DC-isolation capacitor C 3 of isolating transformer TR, C4; The left ac output end that DC-isolation capacitor C 3 in two DC-isolation unit and C4 one end are received two inverter circuits respectively; The other end is received No. 1 terminals of preceding two windings in three winding isolation transformers respectively.
Claims (7)
1. a DC voltage balance control system that is used for mixed multi-level static synchronization compensator is characterized in that this system is made up of rectification circuit, dc energy storage unit, protective circuit, mixing nine electrical level inverters, DC-isolation unit and three winding isolation transformers; Said rectification circuit output end connects two dc energy storage units, and total direct voltage that rectification circuit is exported is divided into two direct voltage sources, is connected with a capacitor-clamped three-level inverter circuit by a protective circuit respectively then; Two synthetic one of tri-level inversion circuit bank are mixed nine electrical level inverters; Two inverter circuit outputs connect a DC-isolation unit respectively, and its ac output voltage is coupled into an alternating voltage by three winding isolation transformers.
2. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that rectifier bridge and smoothing reactor that said rectification circuit is a direct voltage by one group of AC voltage conversion with collection constitute; Direct voltage is connected to the charging input end of dc energy storage unit through smoothing reactor.
3. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that said dc energy storage unit is made of dc partial voltage electric capacity and auxiliary control circuit; Two dc energy storage units are divided into two direct voltage sources with total direct voltage of rectification circuit output, two dc partial voltage electric capacity one ends wherein link together the direct current negative terminal that is parallel to first inverter circuit and the direct current anode of second inverter circuit, the other end is received respectively on DC power supply positive bus-bar and the DC power supply negative busbar.
4. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that said protective circuit is made of IGBT, diode and absorption circuit; The diode inverse parallel absorbs circuit and IGBT and is connected in parallel at the two ends of IGBT; The drain electrode of the negative electrode of diode and IGBT is connected to the direct current anode of first inverter circuit in first protective circuit, and the source electrode of the anode of diode and IGBT is connected to the direct current negative terminal of second inverter circuit in second protective circuit.
5. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that said mixing nine electrical level inverters are made of two tri-level inversion circuits cascadings; Between the tandem tap device of each inverter circuit clamping capacitance is arranged all; The direct current negative terminal of first inverter circuit is received the direct current anode of second inverter circuit and the intermediate interconnection node of two dc partial voltage electric capacity.
6. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that No. 2 terminals of preceding two windings in three winding isolation transformers of the inverter circuit output in the said mixing nine electrical level inverters part receive the right ac output end of two inverter circuits respectively, the 3rd winding is connected to output in the electric power system; No. 1 terminals of preceding two windings are end of the same name.
7. according to the said a kind of DC voltage balance control system that is used for mixed multi-level static synchronization compensator of claim 1, it is characterized in that said DC-isolation unit is used for the DC component of the square wave alternating-current voltage of inverter circuit output is filtered out by one, constitutes to prevent the saturated DC-isolation electric capacity of isolating transformer; DC-isolation electric capacity one end in two DC-isolation unit is received the left ac output end of two inverter circuits respectively; The other end is received No. 1 terminals of preceding two windings in three winding isolation transformers respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101503949A CN101170259A (en) | 2007-11-26 | 2007-11-26 | DC voltage balance control system for mixed multi-level static synchronization compensator |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101503949A CN101170259A (en) | 2007-11-26 | 2007-11-26 | DC voltage balance control system for mixed multi-level static synchronization compensator |
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| CN101170259A true CN101170259A (en) | 2008-04-30 |
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| CNA2007101503949A Pending CN101170259A (en) | 2007-11-26 | 2007-11-26 | DC voltage balance control system for mixed multi-level static synchronization compensator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599708B (en) * | 2009-06-26 | 2011-01-26 | 华中科技大学 | Method for controlling power balance of DC side of cascaded multilevel inverter |
| CN102222925A (en) * | 2011-06-15 | 2011-10-19 | 江苏省电力公司常州供电公司 | Phase current balance method for line current asymmetric compensation of D-STATCOM |
| CN104037786A (en) * | 2014-07-04 | 2014-09-10 | 湖南工业大学 | Cascading STATCOM steady-state zero-error control method |
| CN105119510A (en) * | 2015-08-27 | 2015-12-02 | 南方电网科学研究院有限责任公司 | Capacitance voltage balance method and system of hybrid cascade multilevel converter |
| WO2023087595A1 (en) * | 2021-11-19 | 2023-05-25 | 京清数电(北京)技术有限公司 | Bidirectional energy storage converter |
-
2007
- 2007-11-26 CN CNA2007101503949A patent/CN101170259A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599708B (en) * | 2009-06-26 | 2011-01-26 | 华中科技大学 | Method for controlling power balance of DC side of cascaded multilevel inverter |
| CN102222925A (en) * | 2011-06-15 | 2011-10-19 | 江苏省电力公司常州供电公司 | Phase current balance method for line current asymmetric compensation of D-STATCOM |
| CN104037786A (en) * | 2014-07-04 | 2014-09-10 | 湖南工业大学 | Cascading STATCOM steady-state zero-error control method |
| CN105119510A (en) * | 2015-08-27 | 2015-12-02 | 南方电网科学研究院有限责任公司 | Capacitance voltage balance method and system of hybrid cascade multilevel converter |
| CN105119510B (en) * | 2015-08-27 | 2018-01-09 | 南方电网科学研究院有限责任公司 | Capacitance voltage balance method and system of hybrid cascade multilevel converter |
| WO2023087595A1 (en) * | 2021-11-19 | 2023-05-25 | 京清数电(北京)技术有限公司 | Bidirectional energy storage converter |
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Open date: 20080430 |