CN111193251B - Analysis method for voltage sag of full-compensation system - Google Patents
Analysis method for voltage sag of full-compensation system Download PDFInfo
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- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Abstract
According to the analysis method for the voltage drop of the full compensation system, the primary side current of the voltage regulator and each sequence component of the fault phase current are gradually reduced to the primary side of the phase power supply generator, a primary side composite sequence network diagram of the phase power supply generator is established, the relation between the transformation ratio of the voltage regulator and the leakage reactance and load impedance of the phase power supply generator, the phase power supply phase compensator and the voltage regulator is obtained, the transformation ratio of the voltage regulator is calculated, and therefore the full compensation reference transformation ratio of the ground fault arc is achieved. The voltage sag analysis method is suitable for voltage sag calculation of the earth fault current compensation system of the self-generated power supply phase power supply, provides a theoretical basis for implementation of the earth fault current compensation system of the self-generated power supply phase power supply, and provides a simple, convenient and accurate compensation analysis method for engineering application of the earth fault current compensation system of the self-generated power supply phase power supply.
Description
Technical Field
The application relates to the technical field of power grid electric power, in particular to an analysis method for voltage sag of a full-compensation system.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80% of the total faults of the power distribution network, the safe operation of the power distribution network and equipment is seriously influenced, and the safe processing of the earth fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, the fault current is reduced by adopting an arc suppression coil grounding mode. The arc suppression coil can reduce the fault current to a certain extent, and the system can take the trouble to operate for 2 hours, but the arc suppression coil can not realize full compensation, and the fault point still has the residual current that is less than 10A, and the existence of residual current can cause the person to electrocute, the conflagration accident to and threaten the safe and stable operation of electric wire netting and equipment seriously. When the capacitance current of the system is large, a small-resistance grounding mode is mostly adopted, when a single-phase grounding fault occurs, the zero sequence current of the fault line is amplified, and the relay protection device quickly cuts off the fault line.
Currently, in order to be able to thoroughly eliminate the single-phase earth fault hazard, the reliability of power supply is guaranteed simultaneously. The related technology provides a technology for realizing single-phase earth fault current full compensation by using a phase power supply converter and a voltage regulator, a line power supply on a bus is changed into a reverse phase power supply through the line phase converter, and the overvoltage of a fault phase is suppressed by combining a neutral point of a switching switch access system, so that the purpose of full compensation is achieved.
However, the method does not relate to a method for calculating and adjusting the voltage ratio of the voltage regulator when the voltage regulator is used as the voltage regulator, and the optimal voltage regulator transformation ratio cannot be determined, so that a compensation analysis method for the full compensation reference transformation ratio of the ground fault arc is realized.
Disclosure of Invention
The application provides an analysis method for voltage sag of a full-compensation system, which aims to solve the problem that the optimal voltage regulator transformation ratio cannot be determined in the self-generated power phase power supply ground fault arc extinguishing technology, so that the compensation analysis method for the full-compensation reference transformation ratio of ground fault arc is realized.
The technical scheme adopted by the application for solving the technical problems is as follows:
a method for analyzing voltage sag of a full compensation system comprises the following steps:
when a single-phase earth fault is determined, under a complete compensation state, the initial value of the three-phase voltage of the system and each sequence component of the fault phase voltage are determined;
calculating each sequence component of secondary side current and fault phase current of a phase compensator of a phase power supply;
calculating primary side phase current and fault phase current sequence components of a phase compensator of the phase power supply;
calculating each phase current of the primary side of the phase power supply generator and each sequence component of the fault phase current;
reducing the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the primary side of the phase power supply generator to obtain an expression of voltage, current and impedance;
calculating the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the secondary side of the phase power supply generator to obtain the secondary side output voltage of the phase power supply phase compensator;
and obtaining a voltage regulator change ratio k according to the secondary side output voltage of the phase power supply phase compensator and the voltage obtained by the load in a complete compensation state, and realizing the full compensation reference transformation ratio of the ground fault arc.
Optionally, the calculating of the secondary side current and fault phase current sequence components of the phase compensator of the phase power supply includes calculating primary side current and fault phase current sequence components of the voltage regulator.
Optionally, the method is used for a three-phase transformer system including a phase power supply generator and a phase power supply phase compensator both in delta/Y connection;
the method is used for a self-generated power phase power supply ground fault current compensation system.
Optionally, the voltage drop value of the ground fault current compensation system for self-generating the phase power supply includes a phase power supply generator, a phase power supply phase compensator, a voltage regulator, and a loss of the load device.
Optionally, the leakage reactance parameters of the phase power supply generator, the phase power supply phase compensator, and the voltage regulator are calculated according to the short-circuit impedance voltage of the transformer.
Optionally, the obtaining a voltage regulator change ratio k according to the secondary side output voltage of the phase power supply phase compensator and the voltage obtained by the load in the complete compensation state to realize a full compensation reference transformation ratio of the ground fault arc includes:
and setting the change ratio of the voltage regulator to be variable ratio fine adjustment when the system normally operates, determining the optimal voltage regulator change ratio, and realizing the full compensation reference change ratio of the ground fault arc.
The technical scheme provided by the application comprises the following beneficial technical effects:
according to the analysis method for the voltage drop of the full compensation system, the primary side current of the voltage regulator and each sequence component of the fault phase current are gradually reduced to the primary side of the phase power supply generator, a primary side composite sequence network diagram of the phase power supply generator is established, the relation between the transformation ratio of the voltage regulator and the leakage reactance and load impedance of the phase power supply generator, the phase power supply phase compensator and the voltage regulator is obtained, the transformation ratio of the voltage regulator is calculated, and therefore the full compensation reference transformation ratio of the ground fault arc is achieved. The voltage sag analysis method is suitable for voltage sag calculation of the earth fault current compensation system of the self-generated power supply phase power supply, provides a theoretical basis for implementation of the earth fault current compensation system of the self-generated power supply phase power supply, and provides a simple, convenient and accurate compensation analysis method for engineering application of the earth fault current compensation system of the self-generated power supply phase power supply.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic flow chart illustrating steps of a method for analyzing a voltage sag of a full compensation system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a ground fault current compensation system for a self-generated phase power supply according to an embodiment of the present disclosure;
FIG. 3 is a composite sequence diagram of the equivalent leakage reactance of the transformer, the voltage regulator and the load impedance summed to the primary side of the phase supply generator;
FIG. 4 is an equivalent circuit diagram of FIG. 3;
fig. 5 is a composite sequence diagram of the equivalent leakage reactance of the transformer, the voltage regulator and the load impedance being reduced to the secondary side of the phase compensator of the phase supply power supply.
Detailed Description
In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating steps of an analysis method for a voltage sag of a full compensation system according to an embodiment of the present application, where as shown in the figure, the analysis method for the voltage sag of the full compensation system according to the present application includes the following steps:
when a single-phase earth fault is determined, under a complete compensation state, the initial value of the three-phase voltage of the system and each sequence component of the fault phase voltage are determined;
calculating each sequence component of secondary side current and fault phase current of a phase compensator of a phase power supply;
calculating primary side phase current and fault phase current sequence components of a phase compensator of the phase power supply;
calculating each phase current of the primary side of the phase power supply generator and each sequence component of the fault phase current;
reducing the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the primary side of the phase power supply generator to obtain an expression of voltage, current and impedance;
calculating the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the secondary side of the phase power supply generator to obtain the secondary side output voltage of the phase power supply phase compensator;
and obtaining a voltage regulator change ratio k according to the secondary side output voltage of the phase power supply phase compensator and the voltage obtained by the load in a complete compensation state, and realizing the full compensation reference transformation ratio of the ground fault arc.
According to the voltage drop analysis method provided by the embodiment of the application, the primary side current of the voltage regulator and each sequence component of the fault phase current are gradually reduced to the primary side of the phase power supply generator, a primary side composite sequence network diagram of the phase power supply generator is established, the relation between the transformation ratio of the voltage regulator and the leakage reactance and load impedance of the phase power supply generator, the phase power supply phase compensator and the voltage regulator is obtained, and the transformation ratio of the voltage regulator is calculated, so that the full compensation reference transformation ratio of the ground fault arc is realized.
Optionally, the calculating of the secondary side current and fault phase current sequence components of the phase compensator of the phase power supply includes calculating primary side current and fault phase current sequence components of the voltage regulator.
Further, please refer to fig. 2, which is a schematic structural diagram of a ground fault current compensation system for a self-generated phase power supply, which is applicable to the analysis method for voltage sag of a full compensation system provided in the embodiment of the present application, and the system includes a phase power supply generator, a phase power supply phase compensator, and a voltage regulator; the phase power supply generator and the phase power supply phase compensator are both delta/Y connected three-phase transformer systems, and the analysis method is suitable for voltage drop calculation of the ground fault current compensation system of the self-generated phase power supply with the structure.
As shown in fig. 2, the method is described by taking the occurrence of the ground fault in the a phase as an example, and specifically includes the following steps:
(1) when a single-phase earth fault is determined, under a complete compensation state, the initial value of the three-phase voltage of the system and each sequence component of the fault phase voltage are determined;
decomposing by a symmetrical component method to obtain each sequence component of the fault phase voltage:
wherein the content of the first and second substances,
in order for the faulted phase power supply to be electromotive,
in order to be the fault phase positive sequence voltage,
in order to be the fault phase negative sequence voltage,
is the fault phase zero sequence voltage.
(2) Calculating each sequence component of primary side current of the voltage regulator, namely secondary side current of the phase compensator of the phase power supply and fault phase current;
setting the compensation current as
Expressed in per unit value and k*When the voltage is equal to 1, the primary side current of the voltage regulator, i.e. the secondary side current of the phase compensation transformer, is respectively
Decomposing by a symmetrical component method to obtain each sequence component of the fault phase current:
wherein the content of the first and second substances,
the fault phase positive sequence current of the secondary side of the phase compensator of the phase power supply,
for the phase power supply phase compensator secondary side fault phase negative sequence current,
and the phase supply power supply phase compensator secondary side fault phase zero sequence current is provided.
(3) Calculating primary side phase current and fault phase current sequence components of a phase compensator of the phase power supply;
according to the negative sequence component sign changing principle of the delta/Y transformer, the primary side phase current of the phase compensator of the phase power supply is calculated and obtained as follows:
decomposing by a symmetrical component method to obtain each sequence component of the fault phase current:
wherein the content of the first and second substances,
the primary side fault phase positive sequence current of the phase compensator of the phase power supply,
the primary side of the phase compensator of the phase power supply is provided with fault phase negative sequence current,
the phase compensator of the phase power supply is provided with a fault phase zero sequence current at the primary side.
(4) Calculating the primary phase current of the phase power supply generator and the current components of each sequence of the fault phase;
according to the negative sequence component sign change principle of the delta/Y transformer, the primary side currents of the phase power supply generator are calculated and respectively as follows:
decomposing by a symmetrical component method to obtain each sequence component of the fault phase current:
wherein the content of the first and second substances,
for the fault phase positive sequence current on the primary side of the phase supply generator,
fault phase negative sequence current for the primary side of the phase supply generator,
fault phase zero sequence current for the primary side of the phase supply generator.
(5) Reducing the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the primary side of the phase power supply generator to obtain an expression of voltage, current and impedance;
specifically, the leakage reactance of the phase supply generator and the phase supply phase compensator, and the impedance of the voltage regulator and the load are reduced to the primary side of the phase supply generator, and a composite sequence network is made, see fig. 3.
Recording: z1ΣIs a positive sequence impedance, Z2ΣIs a negative sequence impedance, EΣFor the fault phase electromotive force, the parameters have the following relationship:
thus, the equivalent circuit diagram of fig. 3 is seen in fig. 4.
(6) The leakage reactance, the voltage regulator and the load impedance of the phase power supply generator and the phase power supply phase compensator are reduced to the secondary side of the phase power supply phase compensator to obtain the secondary side output voltage of the phase power supply phase compensator;
specifically, the leakage reactance, the voltage regulator and the load impedance of the phase power supply generator and the phase power supply phase compensator are reduced to the secondary side of the phase power supply phase compensator, a composite sequence network diagram is made, see fig. 5, so as to obtain the output voltage of the secondary side of the phase power supply phase compensator, that is, the voltage at the position L in the diagram is:
wherein the content of the first and second substances,
secondary side output voltage of phase power supply phase compensator, m is transformation ratio of phase power supply generator, n is transformation ratio of phase power supply phase compensator, Z'LReduced to the equivalent impedance, X, of the secondary side of the phase compensator of the phase supply source for the loadT31Is the equivalent impedance of the voltage regulator, X'T21The leakage reactance of the phase compensator of the phase power supply is reduced to the equivalent impedance X' of the secondary side of the phase compensatorT11And (4) the equivalent impedance of the leakage reactance of the phase power supply generator to the secondary side of the phase power supply phase compensator is reduced.
And is
X′L＝k2ZL。
The voltage obtained by the load in the fully compensated state is
Regardless of the phase change, the secondary side output voltage of the phase compensator of the phase power supply satisfies the following formula:
thus:
wherein k is the voltage regulator transformation ratio.
(7) And solving a unitary quartic equation to obtain the transformation ratio k of the voltage regulator.
The following can be obtained from formula (1) and formula (2):
the simplification results in:
in the above formula, a, b, c, d and e are all coefficients, and the voltage regulator transformation ratio k can be obtained by solving the unitary quartic equation of the above formula.
Optionally, the voltage drop value of the ground fault current compensation system for self-generating the phase power supply includes a phase power supply generator, a phase power supply phase compensator, a voltage regulator, and a loss of the load device.
Optionally, the leakage reactance parameters of the phase power supply generator, the phase power supply phase compensator, and the voltage regulator are calculated according to the short-circuit impedance voltage of the transformer.
Optionally, the obtaining a voltage regulator change ratio k according to the secondary side output voltage of the phase power supply phase compensator and the voltage obtained by the load in the complete compensation state to realize a full compensation reference transformation ratio of the ground fault arc includes:
and setting the change ratio of the voltage regulator to be variable ratio fine adjustment when the system normally operates, determining the optimal voltage regulator change ratio, and realizing the full compensation reference change ratio of the ground fault arc.
The calculation process of the voltage regulator transformation ratio is described below with reference to specific examples.
The leakage reactance parameter of the transformer can be obtained by calculation according to the short-circuit impedance voltage of the transformer, in the embodiment, the nameplate parameters of the phase power supply generator and the phase power supply phase compensator are consistent, the rated capacity of the phase power supply generator is 6MVA, the primary rated voltage of the phase power supply generator is equal to the secondary rated voltage of 10kV, the percentage of the short-circuit impedance voltage is 1%, and the rated transformation ratios of the phase power supply generator and the phase power supply phase compensator are both 1, that is, m is equal to n is equal to 1. Neglecting the direct-current resistance, the excitation reactance and the iron loss of the transformer, according to the equivalent circuit of the transformer, the primary side equivalent leakage reactance of the phase power supply generator and the phase power supply phase compensator is as follows:
wherein, U1EFor a primary rated voltage, U2kIs a secondary rated voltage, I2kIs the secondary rated current, gamma is the percentage of the impedance voltage.
The rated capacity of the voltage regulator is 2MVA, and the primary rated voltage is
The impedance voltage percentage is 1 percent, and the equivalent leakage reactance X of the primary winding of the voltage regulator is obtained by calculationT31＝5Ω。
The load being capacitive, impedance ZL＝-10Ω。
The above parameter values are substituted for the formula (3) to obtain:
the above-mentioned unitary quartic equation is solved to obtain the voltage regulator transformation ratio k-1.5412.
According to the analysis method for voltage drop of the full compensation system, the primary side current of the voltage regulator and each sequence component of the fault phase current are gradually reduced to the primary side of the phase power supply generator, the primary side composite sequence network diagram of the phase power supply generator is established, the relation between the transformation ratio of the voltage regulator and the leakage reactance and load impedance of the phase power supply generator, the phase power supply phase compensator and the voltage regulator is obtained, the transformation ratio of the voltage regulator is calculated, and therefore the full compensation reference transformation ratio of the ground fault arc is achieved. The voltage sag analysis method is suitable for voltage sag calculation of the earth fault current compensation system of the self-generated power supply phase power supply, provides a theoretical basis for implementation of the earth fault current compensation system of the self-generated power supply phase power supply, and provides a simple, convenient and accurate compensation analysis method for engineering application of the earth fault current compensation system of the self-generated power supply phase power supply.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (6)
1. A method for analyzing voltage sag of a full compensation system is characterized by comprising the following steps:
when a single-phase earth fault is determined, under a complete compensation state, the initial value of the three-phase voltage of the system and each sequence component of the fault phase voltage are determined;
calculating each sequence component of secondary side current and fault phase current of a phase compensator of a phase power supply;
calculating primary side phase current and fault phase current sequence components of a phase compensator of the phase power supply;
calculating each phase current of the primary side of the phase power supply generator and each sequence component of the fault phase current;
reducing the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the primary side of the phase power supply generator to obtain an expression of voltage, current and impedance;
calculating the leakage reactance of the phase power supply generator and the phase power supply phase compensator, and the impedance of the voltage regulator and the load to the secondary side of the phase power supply generator to obtain the secondary side output voltage of the phase power supply phase compensator;
and obtaining a voltage regulator change ratio k according to the secondary side output voltage of the phase power supply phase compensator and the voltage obtained by the load in a complete compensation state, and realizing the full compensation reference transformation ratio of the ground fault arc.
2. The method of claim 1, wherein the calculating the sequential components of the secondary side current and the fault phase current of the phase compensator of the phase power supply comprises calculating the sequential components of the primary side current and the fault phase current of the voltage regulator.
3. The method for analyzing voltage sag of a fully compensated system according to claim 1, wherein the method is used in a three-phase transformer system comprising a phase power generator and a phase power phase compensator both of which are delta/Y connected;
the method is used for a self-generated power phase power supply ground fault current compensation system.
4. The method for analyzing voltage sag of a fully compensated system according to claim 3, wherein the sag value of the ground fault current compensation system voltage of the self-generated phase power supply comprises the phase power supply generator, the phase power supply phase compensator, the voltage regulator and the self-loss of the load device.
5. The method for analyzing voltage sag of a fully compensated system according to claim 1, wherein the leakage reactance parameters of the phase power supply generator, the phase power supply phase compensator and the voltage regulator are calculated according to the short-circuit impedance voltage of the transformer.
6. The method for analyzing voltage sag of a fully compensated system according to claim 1, wherein the step of obtaining a voltage regulator variation ratio k according to the secondary side output voltage of the phase supply power phase compensator and the voltage obtained by the load in a fully compensated state to realize a fully compensated reference variation ratio of the ground fault arc comprises:
and setting the change ratio of the voltage regulator to be variable ratio fine adjustment when the system normally operates, determining the optimal voltage regulator change ratio, and realizing the full compensation reference change ratio of the ground fault arc.
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| CN112152194A (en) * | 2020-09-24 | 2020-12-29 | 湖南大学 | Power distribution network single-phase earth fault arc extinction system and control method thereof |
| CN112202180B (en) * | 2020-09-24 | 2024-02-06 | 云南电网有限责任公司电力科学研究院 | Full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage |
| CN112909910A (en) * | 2021-01-18 | 2021-06-04 | 长沙理工大学 | Arc extinction method and device for ground fault of power distribution network |
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| US3955133A (en) * | 1973-06-08 | 1976-05-04 | Bbc Brown Boveri & Company Limited | Apparatus for stabilization of electrical power supply mains |
| CN101237146A (en) * | 2008-02-29 | 2008-08-06 | 重庆大学 | Online monitoring and adjustment and control method for single phase compensation status of arc-extinction loop system |
| CN110611317A (en) * | 2019-10-18 | 2019-12-24 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN110741522A (en) * | 2017-05-24 | 2020-01-31 | 瑞典中立控股公司 | Arrangement for earth fault current compensation in an electric power network |
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| US3955133A (en) * | 1973-06-08 | 1976-05-04 | Bbc Brown Boveri & Company Limited | Apparatus for stabilization of electrical power supply mains |
| CN101237146A (en) * | 2008-02-29 | 2008-08-06 | 重庆大学 | Online monitoring and adjustment and control method for single phase compensation status of arc-extinction loop system |
| CN110741522A (en) * | 2017-05-24 | 2020-01-31 | 瑞典中立控股公司 | Arrangement for earth fault current compensation in an electric power network |
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