CN106227912A - Obtain and simplify the analysis method of maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault - Google Patents
Obtain and simplify the analysis method of maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault Download PDFInfo
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- CN106227912A CN106227912A CN201610523184.9A CN201610523184A CN106227912A CN 106227912 A CN106227912 A CN 106227912A CN 201610523184 A CN201610523184 A CN 201610523184A CN 106227912 A CN106227912 A CN 106227912A
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Abstract
The invention discloses a kind of acquisition and simplify the analysis method of maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault, belong to Hyper-Voltage of Power Systems technical field.This analysis method uses the feature of power cable in a large number according to marine wind electric field, establishes simplification wind energy turbine set cable system phantom based on PSCAD/EMTDC.This method proposes; for affecting the factor of transient overvoltage under asymmetry short circuit fault: cable length, trouble point, fault moment, fault type; it is respectively controlled variable research; analyze the factors above affecting laws to transient overvoltage; final obtain break down at stub cable, cable head, this phase voltage peak value, single-phase grounding fault time maximum transient overvoltage, thus marine wind electric field cable system insulation protection is proposed the conclusion with certain reference value.
Description
Technical field
The present invention relates to the technical field of Hyper-Voltage of Power Systems, obtain particularly to one and simplify wind energy turbine set cable system
The analysis method of maximum transient overvoltage under asymmetry short circuit fault.
Background technology
In recent years, Large Scale Wind Farm Integration just moves towards ocean from land, and according to planning, China's offshore wind farm will have the coming years
The growth performance of great-leap-forward.
Meanwhile, the operation maintenance problem about wind energy turbine set the most increasingly comes into one's own, especially transient overvoltage with
And by problems such as its caused apparatus insulated faults.For the feature of marine wind electric field, the electric power transmission of offshore wind farm is logical
Crossing what submarine cable completed, marine wind electric field power system is more complicated, and submarine cable is longer, and environments such as subsea is more severe, may
Owing to unsymmetrical short-circuit produces transient overvoltage.The equipment of cable collection network system and connection thereof (such as transformator, is sent out by overvoltage
Motor etc.) all can produce harm.Obtain wind energy turbine set cable system maximum transient overvoltage under asymmetry short circuit fault, contribute to choosing
By suitably protection equipment and protective measure, the security reliability improving marine wind electric field operation had practical significance.
Summary of the invention
It is an object of the invention to overcome the shortcoming of prior art with not enough, it is provided that a kind of acquisition simplifies wind energy turbine set cable system
The analysis method of maximum transient overvoltage under system asymmetry short circuit fault.
The purpose of the present invention is achieved through the following technical solutions:
A kind of acquisition simplifies the analysis method of maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault, bag
Include following steps:
S1, employing PSCAD/EMTDC electromagnetic transient simulation software, set up and simplify wind energy turbine set cable system, described simplification wind
Electric field cable system includes elements below: ideal source, transformator, chopper, submarine cable, Wind turbines；
S2, the parameter of each element is set in simulation software, the ruuning situation of simulation separate unit blower fan；
S3, emulate the transient state under the influence of the different affecting factors of described simplification wind energy turbine set cable system asymmetry short circuit fault
Over-voltage waveform and amplitude, described influence factor includes cable length, trouble point, fault moment, fault type；
S4, according to conclusion in described step S3 on the basis of, control affect the influence factor of transient overvoltage, acquisition
Simplify maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault.
Further, described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the cable length of wind energy turbine set cable system asymmetry short circuit fault
And amplitude, control trouble point, fault moment, fault type constant, by rationally changing cable length, obtain cable length with temporarily
The relation of state overvoltage.
Further, described step S3 includes:
Emulation simplify wind energy turbine set cable system asymmetry short circuit fault trouble point under the influence of transient overvoltage waveform and
Amplitude, control joint current length, fault moment, fault type are constant, by arranging two sections in simulation software PSCAD/EMTDC
Or the cable that multistage overall length remains unchanged equal to former cable, other parameters of being outside one's consideration except length, occur in cable for equivalent fault point
Diverse location time situation, obtain the relation of cable length and transient overvoltage.
Further, described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the fault moment of wind energy turbine set cable system asymmetry short circuit fault
And amplitude, control cable length, trouble point, fault type constant, it is considered to the specified point of voltage waveform, adjust fault moment, obtain
Take the relation of cable length and transient overvoltage.
Further, described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the fault type of wind energy turbine set cable system asymmetry short circuit fault
And amplitude, control cable length, trouble point, fault moment constant, by contrast single-line to ground fault and two-phase grounding fault, obtain
Take the relation of cable length and transient overvoltage.
The present invention has such advantages as relative to prior art and effect:
1. to relate to equipment more for windfarm system, higher to reliability and security requirement, by experiment or actual measurement wind-powered electricity generation
Under the cable system asymmetry short circuit fault of field, overvoltage is relatively costly, and feasibility is poor.The present invention is entered by input engineering parameter
Row emulation, just can the more convenient related conclusions obtained wind energy turbine set cable system insulation protection；
2. wind energy turbine set cable system is complex, and the present invention carries out science simplification, equivalence to it, build by ideal source,
The model of transformator, chopper, single hop submarine cable, Wind turbines composition, relatively simple, clear, also can conveniently obtain simultaneously
The related law of transient overvoltage under windfarm system asymmetry short circuit fault；
3. the present invention uses control variable thought, studies cable length, trouble point, fault moment, fault type four respectively
Kind principal element is on the impact of transient overvoltage under asymmetry short circuit fault, the most comprehensive, scientifical；
4. the comprehensive analysis above four factors impact on overvoltage, it is possible to obtain certain engineering parameter leeward by emulation
Under electric field cable system asymmetry short circuit fault, maximum transient per unit overvoltage is 3.237, to wind farm device insulation protection
Important references is provided.
Accompanying drawing explanation
Fig. 1 is the illustraton of model simplifying wind energy turbine set cable system；
Fig. 2 is equivalence three-core cable parameter schematic diagram；
Fig. 3 is cable length and transient overvoltage graph of a relation；
Fig. 4 is that trouble point equivalence arranges schematic diagram；
Fig. 5 is trouble point and transient overvoltage graph of a relation；
Fig. 6 is fault moment and transient overvoltage graph of a relation；
Fig. 7 is single phase ground fault oscillogram near certain phase voltage peak value moment；
Fig. 8 is fault type and transient overvoltage graph of a relation；
Fig. 9 is the process step figure of the analysis method of the maximum transient overvoltage disclosed in the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention further describes.Should be appreciated that specific embodiment described herein, and need not only in order to explain the present invention
In limiting the present invention.
Embodiment
Refer to the process step figure that Fig. 9, Fig. 9 are the analysis methods of maximum transient overvoltage in the present embodiment.Tie below
The present invention is further described to close accompanying drawing, and disclosed in the present embodiment, a kind of acquisition simplifies the event of wind energy turbine set cable system unsymmetrical short-circuit
The analysis method of the lower maximum transient overvoltage of barrier, specifically includes following steps:
S1, employing PSCAD/EMTDC electromagnetic transient simulation software, set up the simplification wind-powered electricity generation having and being no less than elements below
Field cable system: ideal source, transformator, chopper, submarine cable, Wind turbines, as shown in Figure 1.
S2, the parameter of each element is set in simulation software, the ruuning situation of simulation separate unit blower fan.
Wherein, infinitely great electrical network by ideal source equivalence, with after carry out blood pressure lowering through 220/35kV transformator；Cable section is adopted
By certain company 3*400 26/35kV construction of cable parameter, it is isosceles triangle arrangement three single-core cables, carrys out equivalent three core electricity
Cable, such as accompanying drawing 2.Use frequency dependence (phase place) circuit of the consideration frequency characteristic proposed in PSCAD/EMTDC based on J.Marti
Model, as shown in table 1:
Table 1. considers frequency dependence (phase place) the circuit model parameter of frequency characteristic
| Travel Time Interpolation: | On |
| Curve Fitting Starting Frequency: | 0.5Hz |
| Curve Fitting Starting Frequency: | 1.0E6Hz |
| Total Number of Frequency Increments: | 100 |
| Maximum Order of Fitting for Yc: | 20 |
| Maximum Fitting Error for Yc: | 0.2% |
| Max.Order per Delay Grp.for Prop.Func. | 20 |
| Maximum Fitting Error for Prop.Func. | 0.2% |
| DC Correction: | Disabled |
| Passivity: | Disabled |
Connecting 4MW blower fan after after 35/0.69kV again blood pressure lowering, wherein wind turbine model during fault is with inductive
Load carries out equivalence, and the selection of reactance value is that the rated current according to transformator draws, and is 0.379mH in this example.
S3, emulation simplify the cable length of wind energy turbine set cable system asymmetry short circuit fault, trouble point, fault moment, event
Transient overvoltage waveform under the influence of barrier type four factors and amplitude；
In engineering, cable system is carried out insulation protection, the related data of transient overvoltage need to be obtained.Therefore, this method is examined
Considering, emulation simplifies the cable length of wind energy turbine set cable system asymmetry short circuit fault, trouble point, fault moment, fault type four
Transient overvoltage waveform under the influence of the factor of kind and amplitude.
Convenient for statement, the one end near desired electrical source is called cable head, the one end near Wind turbines side
It is referred to as cable end piece.
Described step S3 includes: under the influence of emulation simplifies the cable length of wind energy turbine set cable system asymmetry short circuit fault
Transient overvoltage waveform and amplitude, need to control trouble point, fault moment, fault type constant, by rationally changing cable length,
Obtain the relation of cable length and transient overvoltage.
In concrete application, control trouble point is cable head, and fault moment is 0.0175s, and fault type is single-phase earthing
Short circuit, by Reasonable adjustment cable length, obtains the most electric of under different cable lengths Wind turbines machine end high voltage side of transformer
Pressure value, result is as shown in Figure 3.
Described step S3 also includes: under the influence of emulation simplifies the trouble point of wind energy turbine set cable system asymmetry short circuit fault
Transient overvoltage waveform and amplitude, need to control joint current length, fault moment, fault type constant, by simulation software
PSCAD/EMTDC needs arrange two sections or multistage overall length is equal to former cable, the cable remained unchanged except long other parameters of being outside one's consideration, use
Situation when equivalent fault point occurs in the diverse location of cable, obtains the relation of cable length and transient overvoltage.
In concrete application, emulation simplifies the transient state mistake under the influence of the trouble point of wind energy turbine set cable system asymmetry short circuit fault
Voltage waveform and amplitude, control a length of 3km of joint current, and fault moment is 0.0175s, and fault type is single-line to ground fault,
As shown in Figure 4 a 3km cable is split into two sections of cables identical in addition to length, by constantly changing the length of two sections of cables
Degree carrys out equivalent fault point and occurs in the transient overvoltage situation on the diverse location of cable, obtains in trouble point with cable head not
Under same distance, the overvoltage value of Wind turbines machine end high voltage side of transformer, result is as shown in Figure 5.
Described step S3 also includes: under the influence of emulation simplifies the fault moment of wind energy turbine set cable system asymmetry short circuit fault
Transient overvoltage waveform and amplitude, cable length, trouble point, fault type need to be controlled constant, it is considered to voltage waveform specific
Point, adjusts fault moment, obtains the relation of cable length and transient overvoltage.
In concrete application, emulation simplifies the transient state under the influence of the fault moment of wind energy turbine set cable system asymmetry short circuit fault
Over-voltage waveform and amplitude, control cable length is 3km, and trouble point is cable head, and fault type is single-line to ground fault.Examine
Consider the specified point in voltage waveform, adjust fault and the moment occurs, and obtain Wind turbines machine end transformation under the different faults moment
The on high-tension side overvoltage value of device, result is as shown in accompanying drawing 6, accompanying drawing 7.
Described step S3 also includes: under the influence of emulation simplifies the fault type of wind energy turbine set cable system asymmetry short circuit fault
Transient overvoltage waveform and amplitude, cable length, trouble point, fault moment need to be controlled constant, short by contrast single-phase earthing
Road and two-phase grounding fault, obtain the relation of cable length and transient overvoltage.
In concrete application, emulation simplifies the transient state under the influence of the fault type of wind energy turbine set cable system asymmetry short circuit fault
Over-voltage waveform and amplitude, control a length of 3km of joint current, and trouble point is cable head, and fault moment is 0.0175s, contrast
Single-line to ground fault and two kinds of asymmetry short circuit fault types of two-phase grounding fault, and obtain wind turbine under different faults type
The overvoltage value of group machine end high voltage side of transformer, result such as accompanying drawing 8.
S4, according to the conclusion of gained in described step S3 on the basis of, control affect the factor of transient overvoltage, obtain simple
Maximum transient overvoltage under wind-transformation electric field cable system asymmetry short circuit fault.
In concrete application, the concrete conclusion of each sub-steps in analytical procedure S3, it is arranged on control joint current a length of
3km, trouble point is cable head, and fault moment is 0.0175s, and under single-line to ground fault, final acquisition simplifies wind energy turbine set cable
System maximum transient per unit overvoltage is 3.237.
In sum, present embodiment discloses a kind of acquisition and simplify maximum under wind energy turbine set cable system asymmetry short circuit fault
The analysis method of transient overvoltage, belongs to Hyper-Voltage of Power Systems technical field.This analysis method is a large amount of according to marine wind electric field
Use the feature of power cable, establish simplification wind energy turbine set cable system phantom based on PSCAD/EMTDC.This method carries
Go out, for affecting the factor of transient overvoltage under asymmetry short circuit fault: cable length, trouble point, fault moment, failure classes
Type, is respectively controlled variable research, analyzes the factors above affecting laws to transient overvoltage, final obtain stub cable,
Cable head, this phase voltage peak value break down, single-phase grounding fault time maximum transient overvoltage, thus to sea turn
Electric field cable system insulation protection proposes the conclusion with certain reference value.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (5)
1. obtaining and simplify an analysis method for maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault, it is special
Levy and be, comprise the following steps:
S1, employing PSCAD/EMTDC electromagnetic transient simulation software, set up and simplify wind energy turbine set cable system, described simplification wind energy turbine set
Cable system includes elements below: ideal source, transformator, chopper, submarine cable, Wind turbines；
S2, the parameter of each element is set in simulation software, the ruuning situation of simulation separate unit blower fan；
S3, to emulate the transient state under the influence of the different affecting factors of described simplification wind energy turbine set cable system asymmetry short circuit fault the most electric
Corrugating and amplitude, described influence factor includes cable length, trouble point, fault moment, fault type；
S4, according to conclusion in described step S3 on the basis of, control affect the influence factor of transient overvoltage, obtain simplification
Maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault.
The most according to claim 1 acquisition simplifies maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault
Analysis method, it is characterised in that described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the cable length of wind energy turbine set cable system asymmetry short circuit fault and width
Value, controls trouble point, fault moment, fault type constant, by rationally changing cable length, obtains cable length and transient state mistake
The relation of voltage.
The most according to claim 1 acquisition simplifies maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault
Analysis method, it is characterised in that described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the trouble point of wind energy turbine set cable system asymmetry short circuit fault and amplitude,
Control joint current length, fault moment, fault type are constant, by arranging two sections or many in simulation software PSCAD/EMTDC
The cable that Duan overall length remains unchanged equal to former cable, other parameters of being outside one's consideration except length, occurs in cable not for equivalent fault point
Situation during co-located, obtains the relation of cable length and transient overvoltage.
The most according to claim 1 acquisition simplifies maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault
Analysis method, it is characterised in that described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the fault moment of wind energy turbine set cable system asymmetry short circuit fault and width
Value, controls cable length, trouble point, fault type constant, it is considered to the specified point of voltage waveform, adjusts fault moment, obtain electricity
Cable length and the relation of transient overvoltage.
The most according to claim 1 acquisition simplifies maximum transient overvoltage under wind energy turbine set cable system asymmetry short circuit fault
Analysis method, it is characterised in that described step S3 includes:
Emulation simplifies the transient overvoltage waveform under the influence of the fault type of wind energy turbine set cable system asymmetry short circuit fault and width
Value, controls cable length, trouble point, fault moment constant, by contrast single-line to ground fault and two-phase grounding fault, obtains electricity
Cable length and the relation of transient overvoltage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968434A (en) * | 2017-12-08 | 2018-04-27 | 国网辽宁省电力有限公司电力科学研究院 | Wind turbine transient overvoltage analysis method under a kind of high-capacity direct current power disturbance |
| CN111723684A (en) * | 2020-05-29 | 2020-09-29 | 华南理工大学 | Method for identifying transient overvoltage type in offshore wind farm |
| CN113569515A (en) * | 2021-06-11 | 2021-10-29 | 国网内蒙古东部电力有限公司电力科学研究院 | Wind power plant electromagnetic transient analysis method and system |
| CN115663881A (en) * | 2022-09-07 | 2023-01-31 | 国网重庆市电力公司电力科学研究院 | Current control method of power system under symmetrical short-circuit fault of alternating-current power grid |
-
2016
- 2016-07-04 CN CN201610523184.9A patent/CN106227912A/en active Pending
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| 刘欣: "海底高压电缆故障监测和电磁暂态分析研究", 《万方数据库学位论文库》 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968434A (en) * | 2017-12-08 | 2018-04-27 | 国网辽宁省电力有限公司电力科学研究院 | Wind turbine transient overvoltage analysis method under a kind of high-capacity direct current power disturbance |
| CN111723684A (en) * | 2020-05-29 | 2020-09-29 | 华南理工大学 | Method for identifying transient overvoltage type in offshore wind farm |
| CN111723684B (en) * | 2020-05-29 | 2023-07-21 | 华南理工大学 | Identification method for transient overvoltage type in offshore wind farm |
| CN113569515A (en) * | 2021-06-11 | 2021-10-29 | 国网内蒙古东部电力有限公司电力科学研究院 | Wind power plant electromagnetic transient analysis method and system |
| CN115663881A (en) * | 2022-09-07 | 2023-01-31 | 国网重庆市电力公司电力科学研究院 | Current control method of power system under symmetrical short-circuit fault of alternating-current power grid |
| CN115663881B (en) * | 2022-09-07 | 2024-04-30 | 国网重庆市电力公司电力科学研究院 | Current control method for power system under symmetrical short-circuit fault of alternating-current power grid |
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Application publication date: 20161214 |