CN203039369U - Controllable series compensation device for inhibiting subsynchronous resonance of system in power transmission line - Google Patents
Controllable series compensation device for inhibiting subsynchronous resonance of system in power transmission line Download PDFInfo
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- CN203039369U CN203039369U CN201320016727XU CN201320016727U CN203039369U CN 203039369 U CN203039369 U CN 203039369U CN 201320016727X U CN201320016727X U CN 201320016727XU CN 201320016727 U CN201320016727 U CN 201320016727U CN 203039369 U CN203039369 U CN 203039369U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses a controllable series compensation device for inhibiting subsynchronous resonance of a system in a power transmission line. The controllable series compensation device in the utility model can realize smooth control of impedance by controlling a trigger angle of a thyristor, and compared with fixed series compensation, can improve the transmission capability of the system, control tidal currents of the system, inhibit system oscillation, and improve transient stability of the system more effectively, achieving the functions of reducing circuit reactance, improving system stability, and improving power distribution.
Description
Technical field
The utility model relates to the power transmission and distribution technical field, is specifically related to a kind of controlled series compensation device that suppresses system's subsynchronous resonance for transmission line.
Background technology
Because distributed pole is unbalanced on China's generating resource distribution and the power load geographical position, big capacity, long distance power transmission, the realization nationwide integrated power grid is interconnected will to be the characteristics of China's power network development.Improving power system transient stability and increasing through-put power, improve system damping, suppress rapidly to vibrate, suppress subsynchronous resonance after the system failure is the main purpose that China's series compensation is used.But adopt the fixed series capacitor compensation technology may cause subsynchronous resonance (SSR).Slight subsynchronous resonance can reduce the life-span of turbonator shafting, and serious subsynchronous resonance can cause the turbonator shafting fracture, threatens the safe and stable operation of unit and electric power system.
In December, 1970 and be positioned in October, 1971 the Nevada ,Usa downstate Mohave thermal power plant generator unit shaft system since serial compensation capacitance caused subsynchronous resonance twice, the subsynchronous resonance problem just causes extensive concern, has carried out a series of investigation.Along with series compensation device in the world many countries extensive use, the braking measure of subsynchronous resonance is also paid attention to widely, develops the technology of multiple inhibition subsynchronous resonance, mainly contains:
One, uses the controllable series compensation technology.
Two, static block filter, static block filter can effectively reduce dynamo-electric moment of torsion interaction and transient state moment enlarge-effect theoretically, but the shortcoming of this method is that expense height, floor space are big, its blockage effect also depends on the prediction of torsion frequency and the measurement of generator parameter, and torsion frequency changes to some extent with the variation of situations such as load, has excited serious resonance on the contrary if parameter is improper.
Three, additional excitation damping control, it is not very big system that this technology mainly is suitable for the subsynchronous resonance risk, plays certain booster action, but for the bigger system of subsynchronous resonance risk, its effect is limited.
Four, use Static Var Compensator (SVC) and suppress subsynchronous resonance, the effect of SVC inhibition subsynchronous resonance is relevant with compensation capacity, also relevant with running situation and control strategy, and improper as strategy, the effect of damping subsynchronous resonance will be far short of what is expected.
The utility model content
In view of this, the purpose of this utility model is based on the controllable series compensation technology, the controlled series compensation device that provides a kind of transmission line to suppress system's subsynchronous resonance, thus subsynchronous resonance suppressed better, improve system transmissions ability and the stability of electrical power trans mission/distribution system.
According to an aspect of the present utility model, provide a kind of transmission line to suppress the controlled series compensation device of system's subsynchronous resonance, described device comprises: series capacitor bank, damping device and thyristor valve, wherein,
In parallel with described series capacitor bank again behind described damping device and the described thyristor valve tandem.
Preferably, described series capacitor bank is made up of by series system many capacitors;
Described damping device is used for amplitude and the frequency of the discharging current of the described series capacitor bank of restriction, makes its very fast decay, the residual charge of the described series capacitor bank that also is used for releasing rapidly; And
Described thyristor valve changes the electric current that flows through its place branch road constantly by controlling its conducting, thereby changes the equivalent impedance of described controlled series compensation device.
Preferably, described damping device is embodied as inductance.
Preferably, described thyristor valve adopts horizontal type structure, comprises two thyristors of reverse parallel connection.
Preferably, described device further comprises: metal oxide pressure-limiting device, pressure spark discharge device and bypass breaker, wherein,
Described metal oxide pressure-limiting device is in parallel with described series capacitor bank, is used for the overvoltage of the described series capacitor bank of restriction, with the main protection circuit as described series capacitor bank;
Described pressure spark discharge device is in parallel with described series capacitor bank, is used for rapid triggering and with described series capacitor bank bypass, with as the main protection circuit of described metal oxide pressure-limiting device and the backup protection circuit of described series capacitor bank;
Described bypass breaker is an isolating switch in parallel with described series capacitor bank, is used for carrying out described controlled series compensation device string and mends the input of function and the operation of withdrawing from.
Preferably; described metal oxide pressure-limiting device presents high value under normal operating condition; not conducting; and when causing described series capacitor bank overtension when the electric current overrun that flows through described series capacitor bank; described metal oxide pressure-limiting device conducting to be absorbing current energy, thereby plays the effect of the described series capacitor bank of protection.
According to technique scheme, the utility model adds series capacitor bank in the middle of transmission line, and the inductance parallel connection of being controlled by capacitor group and bidirectional thyristor constitutes the controlled series compensation circuit.Controlled series compensation device in the utility model can be realized level and smooth control to impedance by the triggering angle of control thyristor, the relative fixed string is mended, can more effectively improve system transmissions ability, control system trend, suppress system oscillation, improve power system transient stability, play and reduce line reactance, improve the stability of a system, improve the effect that power distributes.
Description of drawings
Fig. 1 is the controlled series compensation manipulated or operated apparatus that transmission line suppresses system's subsynchronous resonance in the utility model embodiment.
Embodiment
Because adopt the fixed series capacitor compensation technology in the electric power system of prior art, the capacitive reactance meeting of series capacitors group produces certain phase deviation at transmission line, thereby cause the subsynchronous resonance phenomenon.Thinking of the present utility model is: by comprising the controlled series compensation circuit arrangement of series capacitor bank, thereby realize compensation to institute's deviation phase.The relative fixed string is mended, and the utility model can more effectively improve system transmissions ability, control system trend, suppresses system oscillation, improve power system transient stability, plays to reduce line reactance, improve the stability of a system, improve the effect that power distributes.Above-mentioned utility model design is embodied in the introduction of following embodiment.
Fig. 1 is the controlled series compensation manipulated or operated apparatus that transmission line suppresses system's subsynchronous resonance in the utility model embodiment.As shown in Figure 1, the controlled series compensation device comprises: series capacitor bank C, metal oxide pressure-limiting device MOV, pressure spark discharge device GAP, damping device L, bypass breaker BPB and thyristor valve TSW etc.Wherein, series capacitor bank, thyristor valve and damping device are the Core Feature parts of this device, that is to say capacitor group and can form the controlled series compensation device by the damping device parallel connection of thyristor valve control.
Series capacitor bank C is a groundwork element in the controlled series compensation device, and it is made up of by series system many capacitors.Metal oxide pressure-limiting device MOV is in parallel with this capacitor group, is used for the overvoltage of limiting capacitance device group, is the main protection circuit of series capacitor bank.Metal oxide pressure-limiting device MOV presents high value under normal operating condition; not conducting; and when causing capacitor group overtension when the electric current overrun that flows through series capacitor bank; metal oxide pressure-limiting device MOV conducting to be absorbing current energy, thereby plays the effect of protection series capacitor bank.Force spark discharge device GAP in parallel with this capacitor group, it can rapid triggering and with the series capacitor bank bypass, it is the main protection circuit of metal oxide pressure-limiting device MOV and the backup protection circuit of series capacitor bank.Bypass breaker BPB is embodied as the isolating switch in parallel with described series capacitor bank, is used for carrying out the device string and mends the input of function and the operation of withdrawing from.In addition, bypass breaker BPB can make spark gap electric arc extinguish rapidly after closing a floodgate, and prevents that the spark gap arcing time is long.Damping device L is embodied as inductance, the amplitude and the frequency that are used for restriction series capacitor bank discharging current, make its very fast decay, thereby reduce discharging current to the infringement of capacitor group, bypass breaker and pressure spark discharge device GAP, also be used for the residual charge of rapid vent discharge container group.Thyristor valve TSW is important equipment in the controlled series compensation device, constantly can change the electric current that flows through its place reactor branch road by the conducting of controlling thyristor valve, thereby changes the equivalent impedance of controlled series compensation device.This thyristor valve adopts horizontal type structure, mainly comprises antiparallel bidirectional thyristor.
Above-mentioned controlled series compensation device can make direct impedance change continuously in perception or capacitive interval under the control of system trigger, with additional torque close with the speed error signal phase place of generation in generator, thus the low-frequency oscillation of effective damping system.
As seen, the controlled series compensation in the utility model is to control to regulate compensativity by thyristor.Two thyristor reverse parallel connections and being connected in the reactor branch road, by changing the triggering angle of thyristor, can change the electric current that flows through the reactor branch road, make thyristor control capacitor loop present total impedance in perception or the interval variation continuously of capacitive, regulate the circuit trend to change the system electrical parameter.By suitable control, the controlled series compensation device can be realized the damping to low frequency oscillations.
According to above-mentioned embodiment introduction as can be known, controlled series compensation device in the utility model is realized level and smooth control to impedance by the triggering angle of control thyristor, the relative fixed string is mended, can more effectively improve system transmissions ability, control system trend, suppress system oscillation, improve power system transient stability, play and reduce line reactance, improve the stability of a system, improve the effect that power distributes.
Claims (6)
1. the controlled series compensation device of a transmission line inhibition system subsynchronous resonance is characterized in that,
Described device comprises: series capacitor bank, damping device and thyristor valve, wherein,
In parallel with described series capacitor bank again behind described damping device and the described thyristor valve tandem.
2. device according to claim 1 is characterized in that,
Described series capacitor bank is made up of by series system many capacitors;
Described damping device is used for amplitude and the frequency of the discharging current of the described series capacitor bank of restriction, makes its very fast decay, the residual charge of the described series capacitor bank that also is used for releasing rapidly; And
Described thyristor valve changes the electric current that flows through its place branch road constantly by controlling its conducting, thereby changes the equivalent impedance of described controlled series compensation device.
3. device according to claim 2 is characterized in that, described damping device is embodied as inductance.
4. device according to claim 2 is characterized in that, described thyristor valve adopts horizontal type structure, comprises two thyristors of reverse parallel connection.
5. device according to claim 1 is characterized in that, described device further comprises: metal oxide pressure-limiting device, pressure spark discharge device and bypass breaker, wherein,
Described metal oxide pressure-limiting device is in parallel with described series capacitor bank, is used for the overvoltage of the described series capacitor bank of restriction, with the main protection circuit as described series capacitor bank;
Described pressure spark discharge device is in parallel with described series capacitor bank, is used for rapid triggering and with described series capacitor bank bypass, with as the main protection circuit of described metal oxide pressure-limiting device and the backup protection circuit of described series capacitor bank;
Described bypass breaker is an isolating switch in parallel with described series capacitor bank, is used for carrying out described controlled series compensation device string and mends the input of function and the operation of withdrawing from.
6. device according to claim 5; it is characterized in that; described metal oxide pressure-limiting device presents high value under normal operating condition; not conducting; and when causing described series capacitor bank overtension when the electric current overrun that flows through described series capacitor bank; described metal oxide pressure-limiting device conducting to be absorbing current energy, thereby plays the effect of the described series capacitor bank of protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320016727XU CN203039369U (en) | 2013-01-11 | 2013-01-11 | Controllable series compensation device for inhibiting subsynchronous resonance of system in power transmission line |
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| CN201320016727XU CN203039369U (en) | 2013-01-11 | 2013-01-11 | Controllable series compensation device for inhibiting subsynchronous resonance of system in power transmission line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377695A (en) * | 2014-11-20 | 2015-02-25 | 清华大学 | Series capacitor compensation device, power transmission circuit and TRV suppressing method |
| GB2535583A (en) * | 2015-02-13 | 2016-08-24 | Beijing Sifang Automation Co | Method and device for sub-synchronous oscillation protection in wind farms |
| CN113949066A (en) * | 2021-11-03 | 2022-01-18 | 国网浙江省电力有限公司电力科学研究院 | Inductance series connection type device for restraining harmonic oscillation and control method thereof |
-
2013
- 2013-01-11 CN CN201320016727XU patent/CN203039369U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377695A (en) * | 2014-11-20 | 2015-02-25 | 清华大学 | Series capacitor compensation device, power transmission circuit and TRV suppressing method |
| GB2535583A (en) * | 2015-02-13 | 2016-08-24 | Beijing Sifang Automation Co | Method and device for sub-synchronous oscillation protection in wind farms |
| GB2535583B (en) * | 2015-02-13 | 2021-06-16 | Beijing Sifang Automation Co | Method and device for sub-synchronous oscillation protection in wind farms |
| CN113949066A (en) * | 2021-11-03 | 2022-01-18 | 国网浙江省电力有限公司电力科学研究院 | Inductance series connection type device for restraining harmonic oscillation and control method thereof |
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Granted publication date: 20130703 |
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