CN1438749A - Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network - Google Patents
Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network Download PDFInfo
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- CN1438749A CN1438749A CN03115937A CN03115937A CN1438749A CN 1438749 A CN1438749 A CN 1438749A CN 03115937 A CN03115937 A CN 03115937A CN 03115937 A CN03115937 A CN 03115937A CN 1438749 A CN1438749 A CN 1438749A
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- transformer
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- transmission line
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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
The structure of the device is as follows. One end of the primary winding of the transformer through the cascaded compensation capacitance is connected to the transmission line of the first electric network; the other end of the primary winding of the transformer is connected to the transmission line of the second electric network. The resistance is connected to the two end of the primary winding or secondary winding of the transformer. The electric induction coil cascaded to the capacitance is parallel connected to the two ends of the secondary winding of the transformer. The invented device can restrain subsynchronous resonance on electric networks caused by series compensation and raise the compensating ratio to more than 90%. The invention increases transmission capacity, raises stability of entire electric networks as well as lowers the cost for operating equipment and electric networks.
Description
Technical field
The present invention relates to a kind of compensator with series capaci tance that can suppress the electrical network subsynchronous resonance.
Background technology
Along with high pressure length apart from the applying of ac transmission network, the inductive reactance of power transmission line becomes the main factor of restriction circuit ability to transmit electricity.The method that solves this bottleneck at present has four kinds: one, increase erects power transmission lines, and improves the ability to transmit electricity from the sending end to the receiving end, and this kind method is costly, because the investment of one thousands of kilometers high voltage transmission line is tens billion of units.Two, on the way or be subjected to the in parallel or series connection fixed capacity compensation arrangement of electric terminals at power transmission line, this kind method can effectively reduce the influence of power transmission line inductive reactance, but will reduce the stability of whole network system greatly, as: may cause the subsynchronous resonance between cluster engine and the electrical network, cause unit to damage, even mains breakdown etc.Three, insert the thyristor controlled series capacitor device in the power transmission line loop, this kind method can effectively reduce the influence of power transmission line inductive reactance, and can change the equivalent impedance of power network line as required at any time, thereby guarantees the stability of network system.But this method price is comparatively expensive.Four, at power transmission line on the way or be subjected to electric terminals and connect static reacance generator or Static Var Compensator, according to the load needs, dynamic adjustments is idle.Thereby effectively reduce the influence of power transmission line inductive reactance, guarantee the stability of network system simultaneously.But this method same price costliness.
Summary of the invention
The object of the present invention is to provide a kind of compensator with series capaci tance that can suppress the electrical network subsynchronous resonance.By resonance of serial connection in the power transmission line circuit the series circuit of work frequency increase network system in subsynchronous frequency range on the occasion of resistance, thereby improve the stability of network system and the compensativity of traditional series capacitor compensation.
The technical solution used in the present invention is as follows:
Scheme 1: in the middle of each the root power transmission line between first electrical network and second electrical network, insert resistance, transformer, the compensator with series capaci tance that inductance and another electric capacity are formed respectively by series compensation capacitance; One end of the former limit of transformer winding behind series compensation capacitance, is connect the power transmission line of first electrical network; The power transmission line of another termination second electrical network of the former limit of transformer winding; Resistance is attempted by the two ends of the former limit of transformer winding; Be attempted by the two ends of transformer secondary winding behind inductance coil and another capacitance series.
Scheme 2: in the middle of each the root power transmission line between first electrical network and second electrical network, insert resistance, transformer, the compensator with series capaci tance that inductance and another electric capacity are formed respectively by series compensation capacitance; One end of the former limit of transformer winding behind series compensation capacitance, is connect the power transmission line of first electrical network; The power transmission line of another termination second electrical network of the former limit of transformer winding; Resistance is attempted by the two ends of transformer secondary winding; Be attempted by the two ends of transformer secondary winding behind inductance coil and another capacitance series.
Said series compensation capacitance is fixed compensation capacitor or variable backoff electric capacity.
The present invention compares with background technology, has the following advantages:
1) for traditional series compensation circuit, can improve the compensativity of series compensation greatly, the compensativity of series compensation is brought up to more than 90%, thereby improved the ability to transmit electricity of power transmission line greatly, save the electric power investment;
2) relatively controllable series compensation circuit, static reacance generator or Static Var Compensator can reduce the cost of device greatly;
3) can improve the stability of whole electrical network greatly, save the power grid operation cost.
The present invention can be widely used in the transmission line of ac high-voltage long distance electricity or need power consumer of series compensation etc.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present invention;
Fig. 2 is an another kind of structural principle schematic diagram of the present invention.
Embodiment
As shown in Figure 1, on the wall scroll power transmission line between first electrical network 1 and second electrical network 2 with an end of the former limit of transformer Tb winding behind series compensation capacitance C1, connect the power transmission line of first electrical network; The power transmission line of another termination second electrical network of the former limit of transformer Tb winding; Resistance R is attempted by the two ends of the former limit of transformer Tb winding; Be attempted by the two ends of transformer Tb secondary winding after inductance coil L1 and another capacitor C 2 serial connections.
As shown in Figure 2, on the wall scroll power transmission line between first electrical network 1 and second electrical network 2 with an end of the former limit of transformer Tb winding behind series compensation capacitance C1, connect the power transmission line of first electrical network; The power transmission line of another termination second electrical network of the former limit of transformer Tb winding; Resistance R is attempted by the two ends of transformer Tb secondary winding; Be attempted by the two ends of transformer Tb secondary winding after inductance coil L1 and another capacitor C 2 serial connections.
Its operation principle is: the operation principle of this circuit is: series compensation capacitance C1 is serially connected in the power transmission line between first electrical network 1 and second electrical network 2 and carries out reactive power compensation with the inductive reactance of offsetting transmission line; Inductance L 1 is formed the series resonant circuit of resonance on work frequency point with capacitor C 2, this resonant circuit provides the approximate zero impedance channel with transformer Tb and resistance R for the electrical network fundamental current, for other harmonic currents provide high impedance channel, make whole electrical network in subsynchronous frequency range, show positive resistance characteristic simultaneously, thereby can effectively suppress the subsynchronous resonance that electrical network may cause because of series compensation, increase the stabilization of power grids.The present invention can use single-phase, and in the electrical network of three-phase and heterogeneous transmission of electricity, wherein series compensation capacitance can be variable backoff electric capacity, perhaps is the fixed capacity compensation.
Claims (4)
1. compensator with series capaci tance that can suppress the electrical network subsynchronous resonance, it is characterized in that: in the middle of each the root power transmission line between first electrical network (1) and second electrical network (2), insert respectively by series compensation capacitance (C1), resistance (R), transformer (Tb), the compensator with series capaci tance that inductance (L1) and another electric capacity (C2) are formed; This device comprises that a end with the former limit of transformer (Tb) winding behind series compensation capacitance (C1), connects the power transmission line of first electrical network (1); The power transmission line of another termination second electrical network (2) of the former limit of transformer (Tb) winding; Resistance (R) is attempted by the two ends of the former limit of transformer (Tb) winding; Be attempted by the two ends of transformer (Tb) secondary winding after inductance coil (L1) and another electric capacity (C2) serial connection.
2. a kind of compensator with series capaci tance that can suppress the electrical network subsynchronous resonance according to claim 1 is characterized in that: said series compensation capacitance (C1) is fixed compensation capacitor or variable backoff electric capacity.
3. compensator with series capaci tance that can suppress the electrical network subsynchronous resonance, it is characterized in that: in the middle of each the root power transmission line between first electrical network (1) and second electrical network (2), insert respectively by series compensation capacitance (C1), resistance (R), transformer (Tb), the compensator with series capaci tance that inductance (L1) and another electric capacity (C2) are formed; This device comprises that a end with the former limit of transformer (Tb) winding behind series compensation capacitance (C1), connects the power transmission line of first electrical network (1); The power transmission line of another termination second electrical network (2) of the former limit of transformer (Tb) winding; Resistance (R) is attempted by the two ends of transformer (Tb) secondary winding; Be attempted by the two ends of transformer (Tb) secondary winding after inductance coil (L1) and another electric capacity (C2) serial connection.
4. a kind of compensator with series capaci tance that can suppress the electrical network subsynchronous resonance according to claim 3 is characterized in that: said series compensation capacitance (C1) is fixed compensation capacitor or variable backoff electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03115937A CN1438749A (en) | 2003-03-19 | 2003-03-19 | Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03115937A CN1438749A (en) | 2003-03-19 | 2003-03-19 | Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network |
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| Publication Number | Publication Date |
|---|---|
| CN1438749A true CN1438749A (en) | 2003-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN03115937A Pending CN1438749A (en) | 2003-03-19 | 2003-03-19 | Series capacitor compensating device capable of inhibiting sub-syuchronous resonance of electric network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499667A (en) * | 2008-11-07 | 2009-08-05 | 中国电力科学研究院 | Apparatus for inhibiting secondary synchronous resonance of turbo generator set |
| CN101512864B (en) * | 2006-09-29 | 2012-01-11 | Abb技术有限公司 | Apparatus and method for transmission system |
| CN101552470B (en) * | 2008-12-12 | 2012-02-22 | 中国电力科学研究院 | Method for inhibiting sub-synchronous resonance on the basis of phase variation |
| CN105914760A (en) * | 2016-06-22 | 2016-08-31 | 西安华瑞网电设备有限公司 | Distribution network reactive power compensation control method and device capable of suppressing resonance |
-
2003
- 2003-03-19 CN CN03115937A patent/CN1438749A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101512864B (en) * | 2006-09-29 | 2012-01-11 | Abb技术有限公司 | Apparatus and method for transmission system |
| CN101499667A (en) * | 2008-11-07 | 2009-08-05 | 中国电力科学研究院 | Apparatus for inhibiting secondary synchronous resonance of turbo generator set |
| CN101552470B (en) * | 2008-12-12 | 2012-02-22 | 中国电力科学研究院 | Method for inhibiting sub-synchronous resonance on the basis of phase variation |
| CN105914760A (en) * | 2016-06-22 | 2016-08-31 | 西安华瑞网电设备有限公司 | Distribution network reactive power compensation control method and device capable of suppressing resonance |
| CN105914760B (en) * | 2016-06-22 | 2018-08-17 | 西安华瑞网电科技股份有限公司 | A kind of power distribution station power-less compensation control method and device can inhibit resonance |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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