CN201146389Y - Power system stabilizer for transforming plant - Google Patents
Power system stabilizer for transforming plant Download PDFInfo
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- CN201146389Y CN201146389Y CNU2007200926161U CN200720092616U CN201146389Y CN 201146389 Y CN201146389 Y CN 201146389Y CN U2007200926161 U CNU2007200926161 U CN U2007200926161U CN 200720092616 U CN200720092616 U CN 200720092616U CN 201146389 Y CN201146389 Y CN 201146389Y
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Abstract
The utility model discloses a power system stabilizer for a substation, which is composed of a detection unit, a low-frequency power generation unit and an output transformer, the detection unit is connected with a power grid, voltage and current signals of the detection power grid simultaneously detect the voltage and the current of the output transformer; the low-frequency power generation unit is connected between the detection unit and the output transformer to process the detected signals for generating a trigger pulse signal and outputting the current needed by inhibiting the low-frequency oscillation; the output transformer is also connected with the power grid, thus isolating the output transformer and the power grid, and further carrying out the voltage transformation to ensure the safe working voltage. When in emergence of the low-frequency oscillation, the power system stabilizer injects the reverse low-frequency power with 0.1 to 5.0Hz to the power grid, thus cutting off a spread path of the low-frequency oscillation signals by eliminating the low-frequency voltage or the low-frequency current in a power system and further eliminating the low-frequency oscillation within the frequency range of 0.1 to 5.0Hz generated by the weak damping of the system.
Description
Technical field:
The utility model relates to electric power system, particularly is used for suppressing the device of the low frequency oscillation that electric power system occurs.
Background technology:
Because power grid security concerns national economy, in recent years, the U.S., Canada, countries such as Russia have caused serious accident because of large-area power-cuts, China is in July, 2006, because Central China Power Grid 500 kilovolt fault trips, cause Henan Power Plant off-the-line, cause the Central China Power Grid low frequency oscillation, cause Henan, Hubei tens million of family residents be affected, Standing Committee of the Chinese People's Political Consultative Conference, the academician of the Chinese Academy of Sciences, the professor Lu Qiang of Tsing-Hua University points out " China's electrical network still exists the threat of low frequency oscillation at present; threaten to have one, the alarm of power grid security can not be removed with regard to one day " in Chinese People's Political Consultative Conference's meeting.But, be easy to cause that electric power system is the low-frequency oscillation of feature with the underdamping in the electric power system of heavy load, weak contact and under the situation of employing quick-response excitation, high gain voltage adjuster.In order to suppress the low-frequency oscillation of electric power system, usually the method that adopts is to set up a kind of additional control that is called power system stabilizer, PSS (PSS) in the exciter control system of generator, adopt the rotating speed deviation, frequency departure, the accelerating power deviation, a signal in the electrical power deviation or several signal (being generally two) are as the additional input of field regulator, to produce damping torque, improve the stability of electric power system, proposed by regulating the rotating speed deviation in " a kind of new approaches of power system stabilizer, PSS design ", the size of electrical power deviation proportionality coefficient suppresses low-frequency oscillation, weakening the low-frequency oscillation of electric power system, guarantee that stabilization of power grids aspect has played positive effect, but can't fundamentally eliminate low-frequency oscillation; The control of linear optimal excitation has appearred subsequently, the control method of non-linear exciter control, as publication number is in the Chinese patent disclosed " ambiguity type power system stabilizer parameter self-optimization method and self-optimization device " of CN1801569A, just disclosed a kind of by detecting synchronous generator rotor rotating speed and synchronous speed, both rotating speed deviations are as input signal, determine the mathematic(al) structure of fuzzy control, and utilize and improve the stability of electric power system from the control device of optimizing, owing to be by realizing in the exciter control system of introducing generator, these control methods and the device low-frequency oscillation that also just decayed can not fundamentally be eliminated low-frequency oscillation.
The utility model content:
Technical problem to be solved in the utility model provides a kind of transformer station power system stabilizer, PSS at above deficiency exactly, this stabilizer is the ruuning situation of detection of grid automatically, when low-frequency oscillation appears in electrical network, inject reverse low frequency power to electrical network, eliminate low-frequency voltage or low-frequency current in the electric power system, cut off the propagation path of oscillating signal, thereby fundamentally eliminate the low-frequency oscillation that produces owing to system's underdamping.
Technical solution adopted in the utility model is:
A kind of transformer station power system stabilizer, PSS is made of detecting unit, low frequency power generating unit and output transformer, and detecting unit is connected with electrical network, and the voltage and current signal of detection of grid detects the voltage and the electric current of output transformer simultaneously; The low frequency power generating unit is connected between detecting unit and the output transformation C, and the signal that detects is handled, and produce the pulse signal that triggers, and output suppresses the required electric current of low frequency oscillation; Output transformer also is connected with electrical network, first output transformer and electrical network is isolated, and second carries out voltage transformation, guarantees the operating voltage of safety.
Detecting unit and electrical network also connect.
Detecting unit is made of first current transformer, second current transformer and voltage transformer, and first current transformer is connected with the primary side of output transformer, is used for the detection of grid electric current; Second current transformer is connected with the secondary side of output transformer with voltage transformer, is used to detect the output current and the line voltage of low frequency power generating unit.
Detecting unit is connected in series with electrical network, and detecting unit is first current transformer that is connected with the primary side of output transformer.
The low frequency power generating unit is made of the inductance capacitance that produces circuit, inverter circuit and inverter circuit output along the signal acquisition circuit that connects, data processing and pulse triggering signal successively, signal acquisition circuit with signal processing after, flow to data processing and pulse triggering signal generation circuit and carry out the A/D conversion, follow the tracks of the variation of detection of grid frequency, when low frequency power oscillation appears in electrical network, produce the trigger impulse of eliminating the electrical network low frequency power oscillation, change the size and the frequency of output current by the switching that drives inverter circuit.
Output transformer is three-phase transformer or three single-phase transformers.
The beneficial effect that the utility model can reach is:
1, of the present utility model is that (0.1～5.0Hz) voltage or low frequency (during 0.1～5.0Hz) current signal, inject reverse low frequency power to electrical network, thereby fundamentally eliminate low-frequency oscillation by low frequency occurs when electrical network.
2, the utility model is not to be installed in the exciter control system of generator, uses as a cover self-contained unit but be contained in transformer station, and it has nothing to do with the excitation control of generator.
3, the utility model can use separately, also can be used, can not eliminate the shortcoming of low-frequency oscillation of electric power system to improve existing power system stability device (PSS) to reduce with the power system stabilizer, PSS (PSS) in the existing exciter control system that is installed in generator.
4,, therefore slower with power system stabilizer, PSS (PSS) tracking velocity by the power plant of regulator generator excitation because the exciter control system of generator has hysteresis effect; And the utility model adopts instantaneous reactive power theory to detect low frequency power oscillation, does not have time-delay, and tracking velocity is fast.
5, the utility model can also carry out the part reactive power compensation; When low-frequency oscillation does not appear in electrical network, can be used for the mains by harmonics filtering.
Description of drawings:
Fig. 1 is a logic block-diagram of the present utility model.
Structural representation when Fig. 2 uses for the utility model is connected to the grid.
Structural representation when Fig. 3 seals in the electrical network use for the utility model.
Embodiment:
The utility model will be further described below in conjunction with accompanying drawing:
At first explanation is: this transformer station's power system stabilizer, PSS, constitute by detecting unit A, low frequency power generating unit B and output transformer C, detecting unit A is connected with electrical network, and the voltage and current signal of detection of grid detects voltage and the electric current of output transformer C simultaneously; Low frequency power generating unit B is connected between detecting unit A and the output transformer C, and the signal that detects is handled, and produces the pulse signal that triggers, and output suppresses the required electric current of low frequency oscillation; Output transformer C also is connected with electrical network, first output transformer C and electrical network is isolated, and second carries out voltage transformation, guarantees the operating voltage of safety.
Embodiment 1: as shown in Figure 1: detecting unit A and electrical network also connect, detecting unit A is made of the first current transformer 1a, the second current transformer 1b and voltage transformer 2, the first current transformer 1a is connected with the primary side of output transformer C, is used for the detection of grid electric current; The second current transformer 1b is connected with the secondary side of voltage transformer 2 with output transformer C, is used to detect output current and the line voltage of low frequency power generating unit B.In order clearly to represent its structure, only provided the phase forming circuit of three-phase output transformer C, the many windings of secondary side (number of windings N＞1) of the every phase of three-phase output transformer C, each secondary winding inductance capacitance through being connected to inverter circuit 5 outputs 6 respectively connects inverter circuit 5,3 pairs of electric currents of signal acquisition circuit, voltage signal carries out isolated variable, data processing and pulse triggering signal produce circuit 4 (not detecting low-frequency oscillation occurs) when operate as normal and do not produce trigger impulse, when detecting low-frequency oscillation and occur, produce the trigger impulse of eliminating low-frequency oscillation, by inject the reverse low-frequency current signal of 0.1～5.0Hz to electrical network, the propagation path of electrical network medium and low frequency power oscillation signal is cut off, eliminate the low frequency power oscillation in the electrical network.
This transformer station can use separately with power system stabilizer, PSS, is used to eliminate the low frequency power oscillation of electric power system, also can be used for the mains by harmonics filtering on the basis of the low frequency power oscillation of eliminating electric power system or uses as controlled reactor.When only being used to eliminate the low frequency power oscillation of electric power system, (electrical network does not have low frequency power oscillation) only has detecting unit A in work under the normal condition, when the capacitance voltage in parallel with inverter circuit 5 equals set point, low frequency power generating unit B is not producing trigger impulse, this moment, output transformer C was because the secondary side no current flows through, and was equivalent to unloaded hanging net operation; When detecting electrical network and be lower than low frequency power oscillation and take place, the data processing of low frequency power generating unit B and pulse triggering signal produce size and the frequency of circuit 4 according to detected low frequency power oscillation signal, produce the modulation signal that suppresses low frequency power oscillation, this signal is through carrier modulation rear drive inverter circuit 5, by leading to of inverter circuit 5, stopping pregnancy is given birth to and is suppressed the required output transformer C secondary side current of low frequency power oscillation, and then change the low-frequency current that primary side injects electrical network, thereby make the low-frequency current signal in the electrical network reduce (when the power system stabilizer, PSS underpower) or the low-frequency current signal in the electrical network can not be transmitted to opposite side.When power system stabilizer, PSS has other function simultaneously, normal operation detecting unit A and low frequency power generating unit B operate as normal, produce the trigger impulse in the inverter circuit 5, output transformer C secondary side has electric current to flow through, when low frequency power oscillation takes place, the electric current of output transformer C primary side has just increased the required electric current of elimination low-frequency oscillation on the basis of former operating current, the inductance capacitance 6 that is connected to the inverter circuit output is used for filtering HF switch interference signal.
Embodiment 2: as shown in Figure 2: in output transformer C serial connection and the electrical network, detecting unit A is the first current transformer 1a that is connected with the primary side of output transformer C.In order clearly to represent its structure, only provided the phase forming circuit of three-phase output transformer C, output transformer C secondary side is simplex winding (N=1), each secondary winding inductance capacitance through being connected to inverter circuit 5 outputs 6 respectively connects inversion electricity 5 tunnel, 3 pairs of electric currents of signal acquisition circuit, voltage signal carries out isolated variable, data processing and pulse triggering signal produce circuit 4 (not detecting low-frequency oscillation occurs) when operate as normal, only produce the trigger impulse that is used for the filtering high order harmonic component as controlled reactor, when detecting low-frequency oscillation and occur, produce the trigger impulse of eliminating low-frequency oscillation and filtering high order harmonic component, thereby cut off the transfer path of oscillating signal.
With embodiment 1: output transformer C seals in electrical network except that being used to eliminate the low frequency power oscillation of electric power system, also can be used as the mains by harmonics filtering.When only being used to eliminate the low frequency power oscillation of electric power system, when low frequency power oscillation did not appear in electrical network, low frequency power generating unit B did not produce trigger impulse (making the secondary zero load) or produces and keeps transformer fe in-core fundamental flux and approach zero trigger impulse (falling to reduce the transformer based wave pressure); When detecting the generation of electrical network low frequency power oscillation, size and the frequency of low frequency power generating unit B according to detected low frequency power oscillation signal, produce the modulation signal that suppresses low frequency power oscillation, this signal drives inverter circuit 5, switching by inverter circuit 5 produces the required output transformer C secondary side current of inhibition low frequency power oscillation, and then change output transformer C primary side terminal voltage, when this terminal voltage size equated with the low-frequency disturbance source size, the low-frequency oscillation current signal in the electrical network just no longer can transmit.
Claims (6)
1, a kind of transformer station power system stabilizer, PSS, it is characterized in that: constitute by detecting unit (A), low frequency power generating unit (B) and output transformer (C), detecting unit (A) is connected with electrical network, the voltage and current signal of detection of grid detects the voltage and the electric current of output transformer (C) simultaneously; Low frequency power generating unit (B) is connected between detecting unit (A) and the output transformer (C), and the signal that detects is handled, and produces the pulse signal that triggers, and output suppresses the required electric current of low frequency oscillation; Output transformer (C) also is connected with electrical network, first output transformer (C) and electrical network is isolated, and second carries out voltage transformation, guarantees the operating voltage of safety.
2, transformer station as claimed in claim 1 power system stabilizer, PSS is characterized in that: detecting unit (A) also connects with electrical network.
3, transformer station as claimed in claim 2 power system stabilizer, PSS, it is characterized in that: detecting unit (A) is made of first current transformer (1a), second current transformer (1b) and voltage transformer (2), first current transformer (1a) is connected with the primary side of output transformer (C), is used for the detection of grid electric current; Second current transformer (1b) is connected with the secondary side of voltage transformer (2) with output transformer (C), is used to detect the output current and the line voltage of low frequency power generating unit (B).
4, transformer station as claimed in claim 1 power system stabilizer, PSS, it is characterized in that: detecting unit (A) is connected in series with electrical network, and detecting unit (A) is first current transformer (1a) that is connected with the primary side of output transformer (C).
5, as claim 1 or 2 or 3 or 4 described transformer station power system stabilizer, PSSs, it is characterized in that: low frequency power generating unit (B) is by successively along the signal acquisition circuit (3) that connects, data processing and pulse triggering signal produce circuit (4), the inductance capacitance (6) of inverter circuit (5) and inverter circuit (5) output constitutes, signal acquisition circuit (3) is with after the signal processing, flow to data processing and pulse triggering signal generation circuit (4) and carry out the A/D conversion, follow the tracks of the variation of detection of grid frequency, when low frequency power oscillation appears in electrical network, produce the trigger impulse of eliminating the electrical network low frequency power oscillation, by driving the logical of inverter circuit (5), the size and the frequency of breaking and changing output current.
6, transformer station as claimed in claim 5 power system stabilizer, PSS, it is characterized in that: output transformer (C) is three-phase transformer or three single-phase transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200926161U CN201146389Y (en) | 2007-11-09 | 2007-11-09 | Power system stabilizer for transforming plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200926161U CN201146389Y (en) | 2007-11-09 | 2007-11-09 | Power system stabilizer for transforming plant |
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| Publication Number | Publication Date |
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| CN201146389Y true CN201146389Y (en) | 2008-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200926161U Expired - Lifetime CN201146389Y (en) | 2007-11-09 | 2007-11-09 | Power system stabilizer for transforming plant |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102231526A (en) * | 2011-06-28 | 2011-11-02 | 辽宁荣信众腾科技有限公司 | Method for suppressing low-frequency oscillation of voltage of power distribution network |
| WO2012055322A1 (en) * | 2010-10-26 | 2012-05-03 | 国家电网公司 | Method, apparatus and system for suppressing low frequency oscillation in power system |
| CN102944778A (en) * | 2012-11-05 | 2013-02-27 | 电子科技大学 | Portable detecting device for low-frequency oscillation of electric system |
| CN106532747A (en) * | 2016-12-29 | 2017-03-22 | 岭东核电有限公司 | Method and device for screening power oscillation caused by power system stabilizer abnormality |
| CN108206529A (en) * | 2017-12-29 | 2018-06-26 | 国网江苏省电力有限公司经济技术研究院 | A kind of method for inhibiting low-frequency oscillation of electric power system |
| CN110867865A (en) * | 2019-11-28 | 2020-03-06 | 漳州科华技术有限责任公司 | Oscillation processing method for switching power supply to access weak power grid and related components |
| CN110768275B (en) * | 2019-11-28 | 2021-08-06 | 漳州科华技术有限责任公司 | Input oscillation management method and device of switching power supply and related components |
-
2007
- 2007-11-09 CN CNU2007200926161U patent/CN201146389Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012055322A1 (en) * | 2010-10-26 | 2012-05-03 | 国家电网公司 | Method, apparatus and system for suppressing low frequency oscillation in power system |
| US9450411B2 (en) | 2010-10-26 | 2016-09-20 | State Grid Corporation Of China | Method, apparatus and system for suppressing low frequency oscillation in power system |
| CN102231526A (en) * | 2011-06-28 | 2011-11-02 | 辽宁荣信众腾科技有限公司 | Method for suppressing low-frequency oscillation of voltage of power distribution network |
| CN102231526B (en) * | 2011-06-28 | 2013-11-06 | 辽宁荣信众腾科技有限公司 | Method for suppressing low-frequency oscillation of voltage of power distribution network |
| CN102944778A (en) * | 2012-11-05 | 2013-02-27 | 电子科技大学 | Portable detecting device for low-frequency oscillation of electric system |
| CN102944778B (en) * | 2012-11-05 | 2015-06-24 | 电子科技大学 | Portable detecting device for low-frequency oscillation of electric system |
| CN106532747A (en) * | 2016-12-29 | 2017-03-22 | 岭东核电有限公司 | Method and device for screening power oscillation caused by power system stabilizer abnormality |
| CN106532747B (en) * | 2016-12-29 | 2019-03-15 | 岭东核电有限公司 | A kind of power system stabilizer, PSS leads to the investigation method and device of oscillation of power extremely |
| CN108206529A (en) * | 2017-12-29 | 2018-06-26 | 国网江苏省电力有限公司经济技术研究院 | A kind of method for inhibiting low-frequency oscillation of electric power system |
| CN108206529B (en) * | 2017-12-29 | 2021-04-30 | 国网江苏省电力有限公司经济技术研究院 | Method for inhibiting low-frequency oscillation of power system |
| CN110867865A (en) * | 2019-11-28 | 2020-03-06 | 漳州科华技术有限责任公司 | Oscillation processing method for switching power supply to access weak power grid and related components |
| WO2021104077A1 (en) * | 2019-11-28 | 2021-06-03 | 漳州科华技术有限责任公司 | Oscillation processing method for accessing switching power supply to weak power grid and related components |
| CN110867865B (en) * | 2019-11-28 | 2021-08-06 | 漳州科华技术有限责任公司 | Oscillation processing method for switching power supply to access weak power grid and related components |
| CN110768275B (en) * | 2019-11-28 | 2021-08-06 | 漳州科华技术有限责任公司 | Input oscillation management method and device of switching power supply and related components |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081105 |