CN112054534A - Voltage division ratio design method of full-compensation system compensation transformer based on fault phase residual voltage - Google Patents
Voltage division ratio design method of full-compensation system compensation transformer based on fault phase residual voltage Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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Abstract
The application provides a full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage, which comprises the following steps: presetting a maximum allowable residual voltage value of a ground fault current compensation system of a self-generated power phase power supply; when the connection groups of the phase power supply generator and the phase power supply phase compensator are Y, acquiring the maximum grounding resistance of a grounding fault current compensation system of a self-generated phase power supply when the single phase is grounded; acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer. The compensation transformer voltage-dividing ratio optimization design method can effectively reduce the production and manufacturing cost of the compensation transformer, avoids the problem of unqualified design in engineering application, is an important theoretical basis for the design of a full compensation system, and can greatly improve the compensation precision through the optimization design of the voltage-dividing ratio of the compensation transformer.
Description
Technical Field
The application relates to the technical field of power distribution network compensation of a power system, in particular to a voltage division ratio design method of a compensation transformer of a full compensation system based on fault phase residual voltage.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80 percent, the safe operation of the power grid 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, an arc suppression coil grounding mode is adopted. 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.
In order to thoroughly eliminate the damage of the single-phase earth fault and ensure the power supply reliability, various methods for completely compensating the current of the single-phase earth fault point are provided at home and abroad. For example: the GFN (ground fault neutralizer) manufactured by swedish neutral in sweden is a representative one which uses power electronic active power supply to realize full compensation of ground fault, and a power distribution network ground fault arc extinction and protection method (CN102074950A) also belongs to active full compensation in principle. On the other hand, there are also patents (CN201910992110.3, CN201910992109.0, etc.) for a system and a method for compensating for a ground fault current of a self-generated phase power supply, which have certain advantages in terms of cost and stability because of using a phase power supply converter and no power electronic power supply. When the compensation system utilizes the voltage regulating transformer to perform ground compensation regulation, the transformation ratio of the transformer affects the output voltage of the ground compensation, and further affects the compensation effect of the system.
A rated transformation ratio calculation method is provided in the existing patent, namely a full compensation system voltage drop analysis method (CN202010081976.1 and CN202010081977.6), a self-generated power supply ground fault compensation system compensation adjustment method (application number CN202010081967.2) and the like, but the influence of residual voltage is not considered in the design process, only the rated transformation ratio is provided, and the voltage division ratio change introduced by residual voltage control is not considered, so that the accurate control of the single-phase ground fault residual voltage of a power distribution system cannot be realized. Therefore, the prior art has no basic theory and calculation method for voltage division ratio design of the voltage regulating transformer of the full compensation system, the production and manufacturing cost of the compensation transformer is not easy to control, the problem of unqualified design in engineering application often occurs, the compensation precision is greatly reduced, and the manufacturing cost is increased.
Disclosure of Invention
The application provides a full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage, and aims to solve the problem of low compensation effect in the prior art.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the application provides a full compensating system compensating transformer voltage division ratio design method based on fault phase residual voltage, the design method is applied to the earth fault current compensating system of self-generating power phase power supply, the earth fault current compensating system of self-generating power phase power supply comprises: the line phase-change converter comprises a phase power supply generator and a phase power supply phase compensator, and the voltage regulating transformer does not contain an arc suppression coil; the method comprises the following steps:
presetting a maximum allowable residual voltage value of a ground fault current compensation system of the self-generated power supply phase power supply;
when the connection group of the phase power supply generator and the phase power supply phase compensator is Y, acquiring the maximum grounding resistance of the ground fault current compensation system of the self-generated power supply phase power supply when the single phase is grounded;
acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer;
and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer.
Optionally, the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated phase power supply is set to be in a range of 0-200V.
Optionally, the obtaining of the maximum ground resistance of the ground fault current compensation system of the self-generated power supply phase power supply when the single phase is grounded includes:
obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: three-phase nominal phase voltages and single phase ground admittance;
calculating the maximum grounding resistance when the single-phase is grounded:
wherein:
abs denotes a modulo function.
Optionally, the obtaining the no-load voltage of the voltage regulating transformer based on the maximum allowable residual voltage value and the maximum ground resistance includes:
wherein:
Ucis the maximum allowable residual voltage value;
is single relative admittance;
equivalent admittance of a self-generated power supply;
Optionally, obtaining the reference transformation ratio of the voltage regulating transformer based on the no-load voltage of the voltage regulating transformer includes:
obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: the voltage ratio of the phase power supply generator, the voltage ratio of the phase power supply phase compensator, the primary side equivalent impedance of the line phase transformer and the primary side equivalent impedance of the regulating transformer;
calculating the reference transformation ratio of the regulating transformer:
wherein:
korgis the reference transformation ratio of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
ZEdistributing capacitive impedance to ground for a ground fault current compensation system that self-generates a phase power supply;
Optionally, the determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer includes:
wherein:
Ustepthe step difference of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
abs is a modulo function.
Compared with the prior art, the beneficial effect of this application is:
the application provides a full compensation system compensation transformer voltage division ratio design method based on fault phase residual voltage, which comprises the following steps: presetting a maximum allowable residual voltage value of a ground fault current compensation system of a self-generated power phase power supply; when the connection groups of the phase power supply generator and the phase power supply phase compensator are Y, acquiring the maximum grounding resistance of a grounding fault current compensation system of a self-generated phase power supply when the single phase is grounded; acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer. The invention provides a voltage division ratio design method of a voltage-regulating transformer of a full compensation system considering the residual voltage of a ground fault phase, provides a theoretical basis and a calculation method for the voltage division ratio design of the voltage-regulating transformer of the independent full compensation system, can effectively reduce the production and manufacturing cost of the compensation transformer, avoids the problem of unqualified design in engineering application, is an important theoretical basis for the design of the full compensation system, and can greatly improve the compensation precision by the optimized design of the voltage division ratio of the compensation transformer.
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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 an overall flowchart of a method for designing a voltage division ratio of a compensation transformer of a full compensation system based on a fault phase residual voltage according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a ground fault current compensation system for self-generated phase power supply according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the 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, an overall flowchart of a method for designing a voltage division ratio of a compensation transformer of a full compensation system based on a fault phase residual voltage is provided in an embodiment of the present invention. As shown in fig. 1, the method comprises the steps of:
s1, presetting the maximum allowable residual voltage value of the earth fault current compensation system of the self-generated power supply phase power supply;
s2, when the connection group of the phase power supply generator and the phase power supply phase compensator is Y, acquiring the maximum grounding resistance of the ground fault current compensation system of the self-generating power supply phase power supply when the single phase is grounded;
s3, acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
s4, acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer;
and S5, determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer.
It should be noted that the voltage division ratio design method of the compensation transformer of the full compensation system based on the residual voltage of the fault phase provided by the embodiment of the present invention is applied to the ground fault current compensation system of the self-generated power supply phase power supply, and the ground fault current compensation system of the self-generated power supply phase power supply is the prior art.
Specifically, as shown in fig. 2, it is a schematic structural diagram of a ground fault current compensation system for self-generated phase power supply in the embodiment of the present invention.
A ground fault current compensation system for self-generating phase power supply comprising: the device comprises a line phase converter, a fling-cut switch 3, a controller 4 and a regulating transformer 5. The input end of the line phase converter is connected with the bus, and the output end of the line phase converter is connected with the fling-cut switch 3; the fling-cut switch 3 is connected with the input end of the regulating transformer 5, and the output end of the regulating transformer 5 is connected with the system neutral point. The line-phase converter comprises a phase power supply generator 1 and a phase power supply phase compensator 2. The voltage regulating transformer 5 does not include an arc suppression coil.
The individual steps are described in detail below:
in step S1, the maximum allowable residual voltage value of the ground fault current compensation system from which the phase power supply is generated is set in advance.
Specifically, in order to ensure personal safety, the setting range of the maximum allowable residual voltage value of the earth fault current compensation system of the self-generated power phase power supply is set to be 0-200V.
In step S2, when the coupling group of the phase power supply generator and the phase power supply phase compensator is Y, the maximum ground resistance of the ground fault current compensation system that generates the phase power supply when the single phase is grounded is obtained.
In the embodiment of the present invention, the phase power generator and the phase compensator are all connected in Y connection. Specifically, the phase power supply generator and the phase power supply phase compensator both adopt a Yyn6 coupling mode.
Step S2 specifically includes the following steps:
s201, obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: three phase nominal phase voltages and a single phase to ground admittance.
In particular, data sources for system rating parameters are well known to those skilled in the art.
S202, calculating the maximum grounding resistance when the single phase is grounded. The calculation formula is as follows:
wherein:
abs denotes a modulo function.
In step S3, the no-load voltage of the voltage regulating transformer is acquired based on the maximum allowable residual voltage value and the maximum ground resistance.
Specifically, firstly, obtaining rated parameters of a ground fault current compensation system for generating a power supply phase power supply comprises: the self-produced power supply equivalent admittance.
And (3) calculating the no-load voltage of the regulating transformer, wherein the calculation formula is as follows:
wherein:
Ucis the maximum allowable residual voltage value;
is single relative admittance;
equivalent admittance of a self-generated power supply;
In step S4, a reference transformation ratio of the voltage regulating transformer is acquired based on the no-load voltage of the voltage regulating transformer.
Specifically, step S4 includes the following steps:
s401, obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: the voltage ratio of the phase power supply generator, the voltage ratio of the phase power supply phase compensator, the primary side equivalent impedance of the line phase transformer and the primary side equivalent impedance of the regulating transformer.
S402, calculating a reference transformation ratio of the voltage regulating transformer, wherein the calculation formula is as follows:
wherein:
korgis the reference transformation ratio of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
ZEdistributing capacitive impedance to ground for a ground fault current compensation system that self-generates a phase power supply;
In step S5, the step difference of the voltage-regulating transformer is determined based on the reference transformation ratio of the voltage-regulating transformer.
Specifically, the primary side rated phase voltage of the voltage regulating transformer is obtained first. And then determining the level difference of the regulating transformer, wherein the calculation formula is as follows:
wherein:
Ustepthe step difference of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
abs is a modulo function.
In one embodiment of the present invention, the method is illustrated by specific examples.
Specifically, firstly, the maximum allowable residual voltage value of the system is determined to be UC＝100V。
Obtaining rated parameters of a ground fault current compensation system for self-generating phase power supply, comprising: the single-phase-to-ground distributed capacitance of the system is 1.5uF, and the single-phase-to-ground admittance of the system
The capacity of the line phase converter of the system is 200kVA, the short-circuit impedance is 4 percent, the voltage transformation ratio is 10kV/10kV, the equivalent reactance of the primary side
The capacity of the voltage regulating transformer is 60kVA, the rated voltage of the primary side is 5.773kV, the short-circuit impedance is 4 percent, and the equivalent reactance of the primary side of the voltage regulating transformer
Equivalent admittance converted to neutral point by self-produced power supply and voltage regulator transformer
Is-0.0227 jS.
And (4) obtaining the maximum grounding resistance value of the system single-phase grounding according to calculation to be 1493 omega.
And calculating the no-load voltage of the voltage regulating transformer to be 5508V under the conditions of the maximum allowable residual voltage and the maximum grounding resistance according to a no-load voltage calculation formula. Calculating the reference transformation ratio k of the compensation voltage regulating transformer according to the full compensation transformation ratio formulaorgIs 1.056.
And determining the level difference of the grounding compensation regulating transformer to be 88V according to the voltage regulator transformation ratio and the level difference determination method.
In summary, compared with the prior art, the method has the following beneficial effects:
the maximum allowable residual voltage value of the earth fault current compensation system of the self-generated power phase power supply is preset; when the connection groups of the phase power supply generator and the phase power supply phase compensator are Y, acquiring the maximum grounding resistance of a grounding fault current compensation system of a self-generated phase power supply when the single phase is grounded; acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance; acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer; and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer. The design theory and the method can effectively reduce the production and manufacturing cost of the compensating transformer, avoid the problem of unqualified design in engineering application, are important theoretical bases for designing the full compensating system, and greatly improve the compensation precision through the optimization design of the voltage division ratio of the compensating transformer.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, 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 circuit structure, article, or apparatus. The term "comprising" a defined element does not, without further limitation, exclude the presence of other like elements in a circuit structure, article, or device that comprises the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. The above-described embodiments of the present application do not limit the scope of the present application.
Claims (6)
1. A method for designing a voltage division ratio of a compensation transformer of a full compensation system based on fault phase residual voltage is characterized in that the method is applied to a ground fault current compensation system of a self-generated power phase power supply, and the ground fault current compensation system of the self-generated power phase power supply comprises the following steps: the line phase-change converter comprises a phase power supply generator and a phase power supply phase compensator, and the voltage regulating transformer does not contain an arc suppression coil; the method comprises the following steps:
presetting a maximum allowable residual voltage value of a ground fault current compensation system of the self-generated power supply phase power supply;
when the connection group of the phase power supply generator and the phase power supply phase compensator is Y, acquiring the maximum grounding resistance of the ground fault current compensation system of the self-generated power supply phase power supply when the single phase is grounded;
acquiring the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum grounding resistance;
acquiring a reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer;
and determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer.
2. The design method according to claim 1, wherein the maximum allowable residual voltage value of the ground fault current compensation system of the self-generated phase power supply is set within a range of 0 to 200V.
3. The design method according to claim 1, wherein the obtaining of the maximum ground resistance of the ground fault current compensation system of the self-generated phase power supply when the system is grounded in a single phase comprises:
obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: three-phase nominal phase voltages and single phase ground admittance;
calculating the maximum grounding resistance when the single-phase is grounded:
wherein:
abs denotes a modulo function.
4. The design method according to claim 3, wherein the obtaining the no-load voltage of the regulating transformer based on the maximum allowable residual voltage value and the maximum ground resistance comprises:
wherein:
Ucis the maximum allowable residual voltage value;
is single relative admittance;
equivalent admittance of a self-generated power supply;
5. The design method according to claim 1, wherein the obtaining the reference transformation ratio of the regulating transformer based on the no-load voltage of the regulating transformer comprises:
obtaining rated parameters of a ground fault current compensation system of a self-generated power phase power supply, wherein the rated parameters comprise: the voltage ratio of the phase power supply generator, the primary side equivalent impedance of the line phase converter and the primary side equivalent impedance of the regulating transformer;
calculating the reference transformation ratio of the regulating transformer:
wherein:
korgis the reference transformation ratio of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
ZEdistributing capacitive impedance to ground for a ground fault current compensation system that self-generates a phase power supply;
6. The design method of claim 1, wherein determining the level difference of the regulating transformer based on the reference transformation ratio of the regulating transformer comprises:
wherein:
Ustepthe step difference of the voltage regulating transformer;
m is the voltage ratio of the phase power supply generator;
abs is a modulo function.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276097A (en) * | 2017-07-05 | 2017-10-20 | 长沙理工大学 | Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc |
| CN110544931A (en) * | 2019-10-18 | 2019-12-06 | 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 |
| WO2020087811A1 (en) * | 2018-11-01 | 2020-05-07 | 杭州求创电力科技有限公司 | Method for suppressing fault phase residual voltage of resonant grounding system based on precise tuning control on active adjustable complex impedance |
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2020
- 2020-09-24 CN CN202011019097.2A patent/CN112054534A/en active Pending
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| CN107276097A (en) * | 2017-07-05 | 2017-10-20 | 长沙理工大学 | Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc |
| WO2020087811A1 (en) * | 2018-11-01 | 2020-05-07 | 杭州求创电力科技有限公司 | Method for suppressing fault phase residual voltage of resonant grounding system based on precise tuning control on active adjustable complex impedance |
| CN110544931A (en) * | 2019-10-18 | 2019-12-06 | 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 |
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