| After the second industrial revolution,electricity has become a new type of energy,people have entered the"electrical era".In modeRN times,electricity has become the basis for the development of various industries.Recent years,China's Extra-High Voltage and Ultra-High Voltage transmission technology have been rapidly developed.With the development of high voltage and long distance transmission technology,a lot of new technology have been invented,but there are many problems to be solved at the same time.In power grid construction,GIS(Gas Insulated Switchgear)and reactive power compensation technology are widely used in power transmission and transformation.New technology will take new problems when it improve our life.The distance between GIS shell and its internal conductor is short,which cause a strong electromagnetic coupling between these two parts.A travelling wave will occurred when the GIS isolating switch and circuit breakers are closed or broken down,which will cause a high frequency oscillation electrical signal called VFTO(Very Fast Transient Voltage),and finally lead to GIS shell circulating current and TGPR(Transient Ground Potential Rise).In the process of long-distance transmission,with the increase of transmission distance and the complexity of power load,it is necessary to adjust the reactive power flexibly.The work of reactive power regulation becomes more complex and heavy,and the traditional compensation method may not meet the requirements.Aiming at solving these problems,the following work will be done in this paper:Based on Maxwell's equations,the derivation process of PEEC(Partial Element Equivalent Circuit)method is studied,and the full-current PEEC model of independent dividing unit is established.According to PEEC method,the GIS shell and bus are divided,the fast calculation formula of the parameters of GIS bus and shell is established,and the substation model with GIS is established.The structure characteristics of HRPC(Hybrid Reactive Power Compensation)are studied,and the simulation model of substation with hybrid reactive power compensation in transient process is established.The simulation model of the basic unit of GIS is established.The primary arc model of disconnector is used to study the characteristics of VFTO generated by disconnector action,and the amplitude-frequency characteristics of typical VFTO signals are obtained.The models of bus,shell and grounding grid of GIS are established,and the circulation characteristics of the shell of GIS are studied.The distribution characteristics of the circulation of the shell are obtained and the corresponding suppression measures are put forward.Based on VFTO unit,the simulation model of TGPR(Transient Ground Potential Rise)of GIS shell is established.The characteristics of TGPR of GIS shell are studied,the characteristics of TGPR are obtained,and the corresponding suppression measures are put forward.Based on the transient model of HRPC and transmission line theory,the VFTO generated by switching action of HRPC and the influence of various parameters of HRPC on VFTO are studied.Combining HRPC with GIS,the characteristics of VFTO in substations with HRPC and the differences between substations without HRPC are compared,and the influence of HRPC on TGPR of GIS shell is studied.Based on the conclusion of the research on the influence of HRPC on VFTO,the common measures to inhibit VFTO produced by HRPC are studied.The effects of HRPC on VFTO and TGPR were obtained,and the inhibiting effects of ferrite magnets on VFTO were studied and verified.The measures for inhibiting VFTO and TGPR in HRPC were proposed.This paper combines GIS and hybrid reactive power compensation.Compared with the unilateral research work,the results obtained are more complete,which is of great significance to the research of UHV transmission and transformation. |
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