CN106528944A - Analysis method for obtaining maximum transient overvoltage of single feeder line of offshore wind power plant under asymmetric short circuit fault - Google Patents

Analysis method for obtaining maximum transient overvoltage of single feeder line of offshore wind power plant under asymmetric short circuit fault Download PDF

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CN106528944A
CN106528944A CN201610900171.9A CN201610900171A CN106528944A CN 106528944 A CN106528944 A CN 106528944A CN 201610900171 A CN201610900171 A CN 201610900171A CN 106528944 A CN106528944 A CN 106528944A
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feeder line
cable
short circuit
wall scroll
electric field
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梁嘉浩
郭亚勋
江晓锋
王加傲
刘刚
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South China University of Technology SCUT
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    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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Abstract

The invention relates to a method for obtaining a maximum transient overvoltage of a single feeder line in a cable power collection network of an offshore wind power plant under an asymmetric short circuit fault, and belongs to the technical field of overvoltages of power systems. According to the method, a PSCAD/EMTDC-based offshore wind power plant instance simulation model is built according to characteristics that a power collection system of the offshore wind power plant uses a large amount of power cables and a topological structure is relatively complex; and overvoltage simulation is performed for different short circuit fault points on the feeder line. By adopting the method, the influence of the fault points on the transient overvoltage is obtained more easily, so that the state of the maximum transient overvoltage in engineering is obtained; and related conclusions have a certain reference value for insulation protection of power collection network system and device of the offshore wind power plant.

Description

Obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Analysis method
Technical field
The present invention relates to the technical field of Hyper-Voltage of Power Systems, and in particular to a kind of soft using PSCAD/EMTDC emulation Part obtains the analysis method of marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault.
Background technology
Large Scale Wind Farm Integration just moves towards ocean from land, and propulsion offshore wind farm construction can not only ensure Chinese energy safety, Meet energy sustainable supply, and the inevitable requirement for promoting energy-saving and emission-reduction.
At the same time, increasing concern has also been obtained with regard to the operation maintenance problem of wind energy turbine set, especially transient state mistake The problems such as voltage and the apparatus insulated failure by caused by it.The operating mode of marine wind electric field is, the power transmission of offshore wind farm Completed by submarine cable, and marine wind electric field Cable layout is more complicated, submarine cable is longer, and environments such as subsea is more disliked It is bad, considerably increase the probability for short trouble occur.The transient overvoltage that short trouble causes threatens cable collection network system And its equipment (the such as transformer, generator etc.) safety of connection.To marine wind electric field cable collection electrical network system transient modelling overvoltage Research, obtains marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault, contributes to from suitable guarantor Shield equipment and safeguard measure, the security reliability to improving marine wind electric field operation have practical significance.
The content of the invention
The technical problem to be solved, seeks to provide marine wind electric field under a kind of acquisition asymmetry short circuit fault The analysis method of wall scroll feeder line maximum transient overvoltage.
The purpose of the present invention is achieved through the following technical solutions：
The analysis method of marine wind electric field wall scroll feeder line maximum transient overvoltage, institute under a kind of acquisition asymmetry short circuit fault The method of stating should be comprised the following steps：
S1, using electromagnetic transient simulation software, for Wind turbines in Practical Project with chain topology connect it is flat Row layout marine wind electric field, sets up the simulation model with the electrical system of marine wind electric field wall scroll feeder line composition as research object；
S2, determine each component parameters computational methods in electrical system, the parameter of each element is set in analogue system, simulate The Large Scale Wind Farm Integration ruuning situation being made up of multigroup blower fan；
In S3, artificial mains network collection electrical network under wall scroll feeder line asymmetry short circuit fault different faults point transient overvoltage waveform And amplitude；
S4, analysis result above, the maximum transient for obtaining marine wind electric field wall scroll feeder line under asymmetry short circuit fault are excessively electric Pressure.
Further, the simulation model bag with the electrical system of marine wind electric field wall scroll feeder line composition as research object Include：
The ideal source of equivalent infinite bulk power grid, main transformer, bus, breaker, cable, generator terminal transformer, wind turbine Group.
Further, the electromagnetic transient simulation software is PSCAD/EMTDC.
Further, in the electrical system of the step S2 cable element parameter computational methods, it is imitative in PSCAD/EMTDC Parameter setting should be carried out for principle as follows in true software：
D=2R (1)
In formula, external diameters of the D for cable, radiuses of the R for cable, RcFor conductor radius, RsFor isolation and layer semiconductor thickness, RiFor i-th layer of conductor layer thickness, IiFor i-th layer of separation layer thickness.
Further, by three single-core cables are arranged come equivalent three-core cable in Chinese character pin-shaped, and it is as follows Principle carries out parameter setting：
L≥R (3)
In formula, L is the distance of horizontal direction between cable, and H is the distance of vertical direction between cable.
Further, in the electrical system of the step S2 transformer element parameter computational methods, in PSCAD/EMTDC Parameter setting should be carried out for principle as follows in simulation software：
In formula,For transformer leakage reactance perunit value, Vs% be short-circuit voltage percentage, VNFor transformer rated voltage, VB For system rating average voltage,For transformer noload losses perunit value, P0For transformer noload losses, P is that transformer is specified Capacity,For transformer copper loss perunit value, PCFor transformer copper loss.
Further, in step S3, in artificial mains network collection electrical network, wall scroll feeder line connects gained by a plurality of submarine cable, Be research different faults point to over-voltage protection, for every cable, in simulation software PSCAD/EMTDC arrange two sections or Multistage overall length is equal to former cable, the cable that other specification of being outside one's consideration except length remains unchanged, and occurs in wall scroll electricity for equivalent fault point The situation during diverse location of cable.
The present invention is had the following advantages relative to prior art and effect：
1. marine wind electric field complex structure, equipment are various, and the present invention carries out scientific and reasonable simplification, equivalent so that marine Windfarm system layer of structure is clear, it is easy to analyze.Especially to wall scroll feeder line asymmetry short circuit fault maximum transient overvoltage Acquisition it is more convenient.
2. for studying different faults point to over-voltage protection, for every cable, in simulation software PSCAD/EMTDC Two sections of setting or multistage overall length are equal to former cable, the cable that other specification of being outside one's consideration except length remains unchanged, so as to obtain equivalent fault Point occurs in the situation during diverse location of single cable, and then obtains marine wind electric field wall scroll feeder line under asymmetry short circuit fault Maximum transient overvoltage.
Description of the drawings
Fig. 1 is marine wind electric field wall scroll feeder cable collection electrical network system layout connection diagram；
Fig. 2 is three-core cable parameter setting schematic diagram,；
Fig. 3 is that transformer parameter arranges schematic diagram；
Fig. 4 is Method of Cable Trouble Point equivalence setting schematic diagram；
Fig. 5 is that trouble point is arranged on wall scroll feeder line (6 Fans) schematic diagram；
Fig. 6 is the trouble point and transient overvoltage graph of a relation changed on wall scroll 1.2km cables；
Fig. 7 is to obtain (6 Fans) maximum transient overvoltage result figure on wind energy turbine set wall scroll feeder line；
Fig. 8 is that trouble point is arranged on wall scroll feeder line (7 Fans) schematic diagram；
Fig. 9 is to obtain (7 Fans) maximum transient overvoltage result figure on wind energy turbine set wall scroll feeder line；
Figure 10 is acquisition maximum transient overvoltage result figure under two-phase short circuit and ground fault；
Figure 11 is the process step figure of the analysis method of the maximum transient overvoltage disclosed in the present invention.
Specific embodiment
For making purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings, refers to accompanying drawing 11, and Figure 11 is maximum transient in the present embodiment The process step figure of the analysis method of overvoltage.It is a kind of disclosed in the present embodiment to obtain marine wind electric field under asymmetry short circuit fault The analysis method of wall scroll feeder line maximum transient overvoltage, specifically includes following steps：
S1, using PSCAD/EMTDC electromagnetic transient simulation softwares, tied with chain type topology for Wind turbines in Practical Project The parallel arrangement marine wind electric field of structure connection, sets up with the electrical system of marine wind electric field wall scroll feeder line composition as research object Simulation model；
In concrete application, model should have and be no less than：The ideal source of equivalent infinite bulk power grid, main transformer, bus, Breaker, cable, generator terminal transformer, Wind turbines, such as accompanying drawing 1.
S2, determine each component parameters computational methods in electrical system, the parameter of each element is set in analogue system, simulate The Large Scale Wind Farm Integration ruuning situation being made up of multigroup blower fan；
In concrete application, infinite bulk power grid is equivalent by ideal source model, the long cable connection in Jing 27km seabeds to 220/ 35kV seas transformation station；
Frequency dependence (phase of the cable section using the consideration frequency characteristic proposed based on J.Marti in PSCAD/EMTDC Position) circuit 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
The distance of main bus-bar and single group draught fan group is 1.2km, and the distance between blower fan and blower fan is 640m, and blower fan Jing 100m are electric Cable, 0.69kV/35kV generator terminal transformers, the feeder line of 80m cable connections to single group cable system.
The computational methods of above-mentioned cable element parameter, should be principle in PSCAD/EMTDC simulation softwares as follows Carry out parameter setting：
D=2R (1)
In formula, external diameters of the D for cable, radiuses of the R for cable, RcFor conductor radius, RsFor isolation and layer semiconductor thickness, RiFor i-th layer of conductor layer thickness, IiFor i-th layer of separation layer thickness.
Whenever necessary, as shown in Figure 2, three single-core cables in Chinese character pin-shaped arrangement, with it come equivalent three-core cable, should Parameter setting is carried out for principle as follows：
L≥R (3)
In formula, L is the distance of horizontal direction between cable, and H is the distance of vertical direction between cable.
The computational methods of above-mentioned transformer element parameter, should be original in PSCAD/EMTDC simulation softwares as follows Parameter setting is carried out then：
In formula,For transformer leakage reactance perunit value, Vs% be short-circuit voltage percentage, VNFor transformer rated voltage, VB For system rating average voltage,For transformer noload losses perunit value, P0For transformer noload losses, P is that transformer is specified Capacity,For transformer copper loss perunit value, PCFor transformer copper loss.
In this example, as shown in Figure 3, leakage reactance perunit value is 0.062637 to the parameter of 4MW generator terminals transformer, open circuit loss mark One value is 0.00113, and copper loss perunit value is 0.0072.
Wind turbine model is carried out equivalent with inductive load, and the selection of reactance value is obtained according to the rated current of transformer Out, in this example it is 0.379mH.
Convenient for statement, this method is numbered to single group inner blower, by taking 6 one group of blower fan group as an example, farthest away from The blower fan of main bus-bar is referred to as No. 1 blower fan, and the blower fan near bus is referred to as No. 6 blower fans.
In S3, artificial mains network collection electrical network under wall scroll feeder line asymmetry short circuit fault different faults point transient overvoltage waveform And amplitude；
In concrete application, collection electrical network wall scroll feeder line is by a plurality of submarine cable connection gained.Affect for obtaining different faults point Under overvoltage, it is considered to by taking single-line to ground fault as an example, only 6 Fans of wall scroll feeder line operationally, as shown in Figure 4 will In wall scroll feeder system, a 1.2km cable (cable i.e. in accompanying drawing 5 between 1 point and 2 points), splits into the identical electricity of two segment length Cable, when being occurred on the diverse location of cable come equivalent fault point by the length for constantly changing two sections of cables, Wind turbines machine The transient overvoltage waveform of end high voltage side of transformer and amplitude.
It is convenient for statement, it is referred to as head end (1 point i.e. in accompanying drawing 5) near one end of grid side, near Wind turbines (2 points i.e. in accompanying drawing 5) of one end of side is referred to as end, as a result as shown in Figure 6.
It can be seen that, single-phase earthing fault point is different, from No. 1 blower fan to No. 6 blower fan (i.e. feeder terminal is to head end) generator terminal transformations The overvoltage of device is all gradually successively decreased.Next conclusion accordingly, this method only focus on the Overvoltage Amplitude of No. 1 blower fan and are not related to Note the situation of other blower fans.
In the same manner, in figure 5 the 640m cables between 2 points and 3 points, the 640m cables between 3 points and 4 points, between 4 points and 5 points 640m cables, the 640m cables between 5 points and 6 points, the 640m cables between 6 points and 7 points split into the identical electricity of two segment length Cable, is occurred on the diverse location of cable come equivalent fault point by the length for constantly changing two sections of cables, as a result can be obtained, transient state Overvoltage peak does not appear in the interlude of cable.
Therefore, this method is proposed, only needs accompanying drawing 5 such as to study the transient overvoltage of this 7 trouble points on wall scroll feeder line, can It is 3.112 perunit values to obtain the maximum transient overvoltage under cable collection electrical network wall scroll feeder line single-phase grounding fault, as a result such as Accompanying drawing 7.Simulation result shows that from feeder line head end to end (in accompanying drawing 61 point to 7 points), the overvoltage of generation is in gradually for trouble point Downward trend.
In the case where wall scroll feeder line connects 7 Fans, the trouble point on feeder line is arranged using method set out above, such as Shown in accompanying drawing 8, the maximum transient overvoltage that can equally obtain under in this case wall scroll feeder line single-phase grounding fault is 3.0874 perunit values, as a result such as accompanying drawing 9.
In the case of two-phase grounding fault, adopt the method also obtain maximum transient overvoltage in this case for 2.34 perunit values, such as accompanying drawing 10.
S4, analysis result above, the maximum transient for obtaining marine wind electric field wall scroll feeder line under asymmetry short circuit fault are excessively electric Pressure.
In sum, the invention discloses wall scroll feeder line is asymmetric short in a kind of acquisition marine wind electric field cable collection electrical network The method of maximum transient overvoltage under the failure of road, belongs to Hyper-Voltage of Power Systems technical field.The method is according to marine wind electric field The characteristics of slip ring system uses power cable in a large number, topological structure is more complicated, establishes the offshore wind farm based on PSCAD/EMTDC Field Case Simulation model, carries out over-voltage simulation for the different short circuit trouble points on feeder line.Using the method, it is easier to draw Impact of the trouble point to transient overvoltage, so as to obtain the situation of maximum transient overvoltage in engineering, related conclusions are to sea turn The insulation protection of electric field cable collection network system and equipment all has certain reference value.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention do not receive above-described embodiment Restriction, it is any without departing from the present invention Spirit Essence made with principle change, modification, replacement, combine, simplification, all should regard For equivalent substitute mode, it is included within protection scope of the present invention.

Claims (7)

1. a kind of analysis method for obtaining marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault, which is special Levy and be, methods described should be comprised the following steps：
S1, using electromagnetic transient simulation software, for the parallel cloth that Wind turbines in Practical Project are connected with chain topology Office's marine wind electric field, sets up the simulation model with the electrical system of marine wind electric field wall scroll feeder line composition as research object；
S2, determine each component parameters computational methods in electrical system, the parameter of each element is set in analogue system, simulate by many The Large Scale Wind Farm Integration ruuning situation of group blower fan composition；
In S3, artificial mains network collection electrical network under wall scroll feeder line asymmetry short circuit fault different faults point transient overvoltage waveform and width Value；
S4, analysis result above, obtain the maximum transient overvoltage of marine wind electric field wall scroll feeder line under asymmetry short circuit fault.
2. it is according to claim 1 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that
The simulation model with the electrical system of marine wind electric field wall scroll feeder line composition as research object includes：Equivalent infinity The ideal source of electrical network, main transformer, bus, breaker, cable, generator terminal transformer, Wind turbines.
3. it is according to claim 1 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that
The electromagnetic transient simulation software is PSCAD/EMTDC.
4. it is according to claim 3 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that the computational methods of cable element parameter in the electrical system of step S2, in PSCAD/EMTDC Parameter setting should be carried out for principle as follows in simulation software：
D=2R (1)
R = R c + R s + Σ i = 1 n R i + I i - - - ( 2 )
In formula, external diameters of the D for cable, radiuses of the R for cable, RcFor conductor radius, RsFor isolation and layer semiconductor thickness, RiFor I-th layer of conductor layer thickness, IiFor i-th layer of separation layer thickness.
5. it is according to claim 3 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that
By three single-core cables in Chinese character pin-shaped arrangement come equivalent three-core cable, and enter line parameter for principle as follows and set Put：
L≥R (3)
H ≥ 3 R - - - ( 4 )
In formula, L is the distance of horizontal direction between cable, and H is the distance of vertical direction between cable.
6. it is according to claim 3 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that the computational methods of transformer element parameter in the electrical system of step S2, in PSCAD/ Parameter setting should be carried out for principle as follows in EMTDC simulation softwares：
X T * = V s % 100 × V N 2 V B 2 - - - ( 5 )
P 0 * = P 0 P - - - ( 6 )
P C * = P C P - - - ( 7 )
In formula,For transformer leakage reactance perunit value, Vs% be short-circuit voltage percentage, VNFor transformer rated voltage, VBFor system Rating average voltage,For transformer noload losses perunit value, P0For transformer noload losses, P is transformer rated capacity, For transformer copper loss perunit value, PCFor transformer copper loss.
7. it is according to claim 1 to obtain marine wind electric field wall scroll feeder line maximum transient overvoltage under asymmetry short circuit fault Method, it is characterised in that
In step S3, in artificial mains network collection electrical network, wall scroll feeder line, by a plurality of submarine cable connection gained, is research different faults Point for every cable, arranges two sections in simulation software PSCAD/EMTDC or multistage overall length is equal to original to over-voltage protection The cable that cable, other specification of being outside one's consideration except length remain unchanged, when occurring in the diverse location of single cable for equivalent fault point Situation.
CN201610900171.9A 2016-10-14 2016-10-14 Analysis method for obtaining maximum transient overvoltage of single feeder line of offshore wind power plant under asymmetric short circuit fault Pending CN106528944A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107844628A (en) * 2017-09-26 2018-03-27 上海电力学院 A kind of Large Scale Offshore Wind Farm collector system redundancy optimization method
CN108509712A (en) * 2018-03-29 2018-09-07 南方电网科学研究院有限责任公司 A kind of the over-voltage simulation analysis method and system of cable run
CN113297750A (en) * 2021-06-07 2021-08-24 广东电网有限责任公司 Cable model selection method and system for offshore wind power plant

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘颀: "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》 *
宣耀伟 等: "海底交流电缆暂态过电压仿真计算", 《高压电器》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107844628A (en) * 2017-09-26 2018-03-27 上海电力学院 A kind of Large Scale Offshore Wind Farm collector system redundancy optimization method
CN107844628B (en) * 2017-09-26 2021-10-08 上海电力学院 Redundancy optimization method for large-scale offshore wind farm power collection system
CN108509712A (en) * 2018-03-29 2018-09-07 南方电网科学研究院有限责任公司 A kind of the over-voltage simulation analysis method and system of cable run
CN108509712B (en) * 2018-03-29 2022-07-22 南方电网科学研究院有限责任公司 Overvoltage simulation analysis method and system for cable line
CN113297750A (en) * 2021-06-07 2021-08-24 广东电网有限责任公司 Cable model selection method and system for offshore wind power plant

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Application publication date: 20170322