CN103199553A - Method for fast eliminating power system ferroresonance - Google Patents
Method for fast eliminating power system ferroresonance Download PDFInfo
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- CN103199553A CN103199553A CN2013100920555A CN201310092055A CN103199553A CN 103199553 A CN103199553 A CN 103199553A CN 2013100920555 A CN2013100920555 A CN 2013100920555A CN 201310092055 A CN201310092055 A CN 201310092055A CN 103199553 A CN103199553 A CN 103199553A
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Abstract
Power system ferroresonance is a nonlinearity electromagnetic phenomenon. Ferroresonance can be simulated by change of operation methods of a power system and operation of system equipment. Long-time overvoltage and overcurrent produced by the ferroresonance threaten the safety of the power system greatly. The method for fast eliminating the power system ferroresonance comprises a first step of giving a model of providing one-phase ferroresonance equivalent linear timevariant and a state equation of an equivalent circuit according to a transformer substation wiring diagram of the ferroresonance, and a second step of eliminating the one-phase ferromagnetic resonance phenomena by utilizing of a simplest controller, and a third step of verifying correctness of a conclusion through experiments.
Description
Technical field
The present invention relates to the quick removing method of electric power system ferro resonance, belong to the electrical engineering field.
Background technology
Ferro resonance is a kind of nonlinear electromagnetic phenomenon.Greater than
In the electric power system of electric pressure neutral point effective grounding, because of the change of operational mode or the tripping operation voluntarily of circuit breaker, to in a certain zone, form resonant tank by the voltage transformer of the equalizing capacitance of circuit breaker, line mutual-ground capacitor etc. and neutral ground, cause ferro-resonance over-voltage, because electromagnetic potential transformer core sataration, when system parameters meets specified conditions, the instrument transformer two ends will produce resonance overvoltage, and life period is very long, bring grave danger to power system security, threaten electric power netting safe running.Therefore, ferro resonance is people's question of common concern always, studies it to preventing device damage and ensureing that electric power netting safe running has important meaning.
People have proposed the measure of a lot of elimination resonance from different angles, have obtained a lot of achievements in research.Directly in the system, obtain a lot of useful experimental datas and rule at neutral point, proposed the measure of different elimination resonance.And the method for ferromagnetic harmonic elimination is rarely had report.
The present invention adopts simple controller, can realize the quick elimination of electric power system ferro resonance.
Summary of the invention
The invention provides the quick removing method of a kind of electric power system ferro resonance, this method at first according to ferro resonance transformer station winding diagram as shown in Figure 1, the model that becomes when providing single-phase ferro resonance equivalent linear as shown in Figure 2, and provide the state equation of its equivalent electric circuit, utilize simple controllers to eliminate single-phase resonance phenomena in ferromagnetic then, verify the correctness of conclusion by experiment.
The technical scheme concrete steps that the present invention proposes comprise: the actual ferro-resonance circuit in the electric power system can turn to a single-phase ferro-resonance circuit and analyze, and establishes the electric current that flows through transformer inductance to be
,
Be the transformer magnetic linkage, then excitation property is expressed as follows by a septic equation:
System's differential equation is after the circuit model normalization:
In the formula,
Wherein,
Be supply voltage;
Be equalizing capacitance;
Be system's equivalence direct-to-ground capacitance;
Be magnetizing inductance;
Be core loss.
Its harmonic elimination controller is
Wherein,
For the adaptive updates rule also can be expressed as
In the formula,
Be positive constant, utilize above-mentioned adaptive controller can realize the quick elimination of electric power system ferro resonance.
Technique effect of the present invention: the quick technology for eliminating scheme of above-mentioned a kind of electric power system ferro resonance that the present invention proposes, this method is at first according to ferro resonance transformer station winding diagram, the model that becomes when providing single-phase ferro resonance equivalent linear and the state equation that provides its equivalent electric circuit, utilize simple controllers to eliminate single-phase resonance phenomena in ferromagnetic then, verify the correctness of conclusion by experiment.
Description of drawings
Fig. 1 is ferro resonance transformer station winding diagram.
Fig. 2 is single-phase ferro resonance equivalent electric circuit.
Fig. 3 is the ferromagnetic vibration time-domain response of system (2).
Fig. 4 is system (2) chaos attractor.
Fig. 5 is that embodiment 1 resonance oscillations suppresses the back time-domain response; (a)
And
Time-domain response.
Fig. 6 is embodiment 1 resonance oscillations Adaptive Suppression
Response.
Embodiment
Embodiment:
Actual ferro-resonance circuit in the electric power system can turn to a single-phase ferro-resonance circuit and analyze, and establishes the electric current that flows through transformer inductance to be
,
Be the transformer magnetic linkage, then excitation property is expressed as follows by a septic equation:
System's differential equation is after the circuit model normalization:
In the formula
Wherein,
Be supply voltage;
Be equalizing capacitance;
Be system's equivalence direct-to-ground capacitance;
Be magnetizing inductance;
Be core loss.
Work as parameter
The time, system (2) time-domain response occurs and chaos attractor is distinguished as shown in Figure 3, Figure 4.
Its harmonic elimination controller is
Wherein,
For the adaptive updates rule also can be expressed as:
In the formula,
The time, utilizing above-mentioned adaptive controller, ferromagnetic harmonic wave is eliminated the result as shown in Figure 5, parameter
The automated response result as shown in Figure 6.
From Fig. 3, Fig. 5 as can be seen, the above-mentioned adaptive approach of this kind can effectively be eliminated the ferromagnetic harmonic characterisitic of electric power system.
This ferromagnetic output result is good.Use the result to show that this method has the good restraining degree for the noise level in the transformer and harmonic wave, compare with similar transformer, can obtain better transformation output effect.
Claims (3)
1. single-phase ferromagnetic harmonic elimination method, it is characterized in that: this method is at first according to ferro resonance transformer station winding diagram, the model that becomes when providing single-phase ferro resonance equivalent linear and the state equation that provides its equivalent electric circuit, utilize simple controllers to eliminate single-phase resonance phenomena in ferromagnetic then, verify the correctness of conclusion by experiment.
2. method according to claim 1, it is characterized in that: the actual ferro-resonance circuit in the electric power system can turn to a single-phase ferro-resonance circuit and analyze, and establishes the electric current that flows through transformer inductance to be
,
Be the transformer magnetic linkage, then excitation property is as follows by seven rank The Representation Equation:
System's differential equation is after the circuit model normalization:
(2)
In the formula
Wherein,
Be supply voltage;
Be equalizing capacitance;
Be system's equivalence direct-to-ground capacitance;
Be magnetizing inductance;
Be core loss.
3. method according to claim 1, it is characterized in that: its harmonic elimination controller is:
Wherein,
For the adaptive updates rule also can be expressed as:
In the formula,
Be positive constant, utilize above-mentioned adaptive controller can realize the quick elimination of electric power system ferro resonance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100920555A CN103199553A (en) | 2013-03-22 | 2013-03-22 | Method for fast eliminating power system ferroresonance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100920555A CN103199553A (en) | 2013-03-22 | 2013-03-22 | Method for fast eliminating power system ferroresonance |
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| CN103199553A true CN103199553A (en) | 2013-07-10 |
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| CN2013100920555A Pending CN103199553A (en) | 2013-03-22 | 2013-03-22 | Method for fast eliminating power system ferroresonance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445109A (en) * | 2018-05-04 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of quick removing method and device of Ferroresonance Overvoltage Caused by PT |
-
2013
- 2013-03-22 CN CN2013100920555A patent/CN103199553A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 代姚等: "应用T-S模糊方法对铁磁谐振过电压的混沌抑制", 《高电压技术》 * |
| 刘凡等: "基于常值脉冲法的铁磁谐振过电压混沌抑制", 《电网技术》 * |
| 杨庆等: "避雷器对具有混沌效应铁磁谐振过电压的影响", 《高电压技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445109A (en) * | 2018-05-04 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of quick removing method and device of Ferroresonance Overvoltage Caused by PT |
| CN110445109B (en) * | 2018-05-04 | 2022-03-29 | 南京南瑞继保电气有限公司 | Method and device for rapidly eliminating ferromagnetic resonance of voltage transformer |
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Application publication date: 20130710 |