CN103928920A - Method for optimally configuring electric reactor for limiting super/ultra high voltage coupling circuit secondary arc currents - Google Patents

Abstract

The invention provides a method for optimally configuring an electric reactor for limiting super/ultra high voltage coupling circuit secondary arc currents. The method comprises the following steps of determining an original parameter matrix, writing the relation between the secondary arc currents Ij under different failure modes and a coupling parameter matrix according to a fault type, calculating the upper limit and the lower limit of the compensation degree of a device line and the maximum value Imax of the secondary arc currents meeting rapid automatic reclosing lock requirements, solving a simultaneous analysis model, and obtaining the optimized compensation configuration scheme according to the secondary arc currents. The method has the obvious advantages of simplifying the calculation process, optimizing the calculation result and improving the working efficiency. The method has the advantages of being suitable for a same-tower double-circuit line, and being applied to four-circuit or more-circuit lines, and the method for optimally configuring the electric reactor for limiting the secondary arc currents for the super/ultra high voltage coupling circuit is simple and efficient.

Description

The reactor Optimal Configuration Method of restriction ultra-high/extra-high voltage coupling circuit secondary arc current

Technical field

The present invention relates to that electric power system is super, ultra high voltage technical field, particularly relate to a kind of reactor Optimal Configuration Method that limits ultra-high/extra-high voltage coupling circuit secondary arc current.

Background technology

For to the reasonable utilization of transmission of electricity corridor land used, improve transmission power, reduce the consideration of the factors such as unit capacity power construction cost, common-tower double-return and even feed back electric scheme and be widely adopted in developed country and area with tower more.

Many times wiring on the same tower cause coupling coefficient between wire to increase, between wire and wire, all there is stronger electromagnetic coupled and electrostatic coupling between wire and the earth.Cause diving for electric arc sustained combustion after single phase ground fault, high speed automatic reclosing is difficult to realize, and then causes and cause heavy losses by power outage.Secondary arc current is comprised of electrostatic induction component and electromagnetic induction component, and electrostatic induction component is produced by each alternate capacitive coupling, accounts for larger specific gravity.China's supertension line adopts high-voltage shunt reactor neutral point to add little resistance limits and dives for electric arc.By reasonably selecting the reactance value of reactor, make both form parallel resonance, its impedance is infinitely great, this has just cut off alternate contact, effectively limits secondary arc current amplitude.Single back transmission line, the choosing than being easier to of best reactance value, many back transmission lines, must consider the compensation between twice, the connected mode that high resistance in parallel may adopt is simultaneously various, calculates optimal parameter difficulty.

In view of the complexity that same many back transmission lines of tower secondary arc current is analyzed, there is no at present ripe effectively reactor Optimal Configuration Method both at home and abroad.Foundation is applicable to same many back transmission lines of tower secondary arc current analytical model that coupling is strong, carry out the secondary arc current assessment under different operating conditions, for different situations, carry out reactance and distribute to reduce circuit secondary arc current rationally, significant to power grid construction and O&M maintenance.

Summary of the invention

For overcoming the defect existing in prior art, the invention provides a kind of reactor Optimal Configuration Method that limits ultra-high/extra-high voltage coupling circuit secondary arc current, object is by optimizing parallel reactance allocation plan, ultra-high/extra-high voltage coupling circuit secondary arc current and recovery voltage that effectively restriction is arranged for many times with tower.

For achieving the above object, the technical solution adopted in the present invention is:

The reactor Optimal Configuration Method of restriction ultra-high/extra-high voltage coupling circuit secondary arc current, comprises the following steps: determine initial parameter matrix; According to fault type row, write secondary arc current I under different faults mode _jwith coupling parameter matrix relationship formula; The upper and lower margin of computing equipment line build-out degree and the secondary arc current maximum I that meets high speed automatic reclosing requirement _max; Simultaneous analytical model solves, and according to secondary arc current, obtains and optimizes post-compensation allocation plan.

Described initial parameter matrix, refers to determine multi-circuit lines on the same tower conductor arrangement mode, line length and line parameter circuit value, forms initial parameter matrix.

Advantage of the present invention and effect are:

The present invention is by optimizing parallel reactance allocation plan, and effectively restriction is with ultra-high/extra-high voltage coupling circuit secondary arc current and the recovery voltage of many times layouts of tower.To supply the problem that the electric arc arcing time is distributed high resistance in parallel and little reactance parameter rationally to change into the problem of asking for each circuit secondary arc current optimal solution for reducing to dive.Simplify computational process, optimized result of calculation, improved operating efficiency.Be applicable to various connected modes such as, different name fault, heterogeneous fault and high resistances in parallel, the feature of the method is not to be only applicable to common-tower double-return line, and can be applied to four times and Above Transmission Lines, for the reactor of ultra-high/extra-high voltage circuit restriction secondary arc current is provided rationally by a kind of simple, efficient method that provides.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.

Fig. 1 is calculation flow chart of the present invention;

Fig. 2 is that 220kV/500kV is with many times conductor arrangement mode schematic diagrames of tower;

Fig. 3 is computation model schematic diagram of the present invention;

Fig. 4 is the parallel high voltage reactor equivalent model schematic diagram with the little reactance of neutral point;

Fig. 5 is with the parallel high voltage reactor equivalent model schematic diagram of the little reactance of neutral point after variable star angle.

Embodiment

The present invention is the reactor Optimal Configuration Method of restriction ultra-high/extra-high voltage coupling circuit secondary arc current, comprises the following steps: determine initial parameter matrix; According to fault type row, write secondary arc current I under different faults mode _jwith coupling parameter matrix relationship formula; The upper and lower margin of computing equipment line build-out degree and the secondary arc current maximum I that meets high speed automatic reclosing requirement _max; Simultaneous analytical model solves, and according to secondary arc current, obtains and optimizes post-compensation allocation plan.Described initial parameter matrix, refers to determine multi-circuit lines on the same tower conductor arrangement mode, line length and line parameter circuit value, forms initial parameter matrix.

As shown in Figure 1 and Figure 2, take certain 220kV/5000kV superhigh pressure feeds back electric system I with tower four and returns A and single phase ground fault occurs mutually as the reactor Optimal Configuration Method of example introduction restriction ultra-high/extra-high voltage coupling circuit secondary arc current.

Concrete steps are as follows:

1) with the line of A phase power transmission line coupling between, return between capacitive reactance be X _aB, X _aC, X _aU, X _aV, X _aW, X _aa, X _ab, X _ac, X _au, X _av, X _aw, as shown in Figure 3.The induction reactance of the high resistance in parallel being connected with I loop line is Δ X _a, Δ X _b, Δ X _c, Δ X _n1, as shown in Figure 4.Utilize circuit basic principle, Fig. 4 can equivalence become Fig. 5 form.The induction reactance of the high resistance in parallel being connected with II loop line is Δ X _u, Δ X _v, Δ X _w, Δ X _n2, resultant admittance X' as the formula (1).

$\left\{\begin{array}{c}{X}_{\mathrm{AB}}^{\′}=X_{\mathrm{AB}}+{\mathrm{\ΔX}}_{\mathrm{AB}}=X_{\mathrm{AB}}+\frac{\mathrm{\ΔX}}{{\mathrm{\ΔX}}_C}\\ X_{\mathrm{AC}}^{\′}=X_{\mathrm{AC}}+{\mathrm{\ΔX}}_{\mathrm{AC}}=X_{\mathrm{AC}}+\frac{\mathrm{\ΔX}}{\mathrm{\Δ}{X}_B}\\ X_{\mathrm{AU}}^{\′}=X_{\mathrm{AU}},X_{\mathrm{AV}}^{\′}=X_{\mathrm{AV}},X_{\mathrm{AW}}^{\′}=X_{\mathrm{AW}}\\ X_{\mathrm{Aa}}^{\′}=X_{\mathrm{Aa}},X_{\mathrm{Ab}}^{\′}=X_{\mathrm{Ab}},X_{\mathrm{Ac}}^{\′}=X_{\mathrm{Ac}}\\ X_{\mathrm{Au}}^{\′}=X_{\mathrm{Au}},X_{\mathrm{Av}}^{\′}=X_{\mathrm{Av}},X_{\mathrm{AW}}^{\′}=X_{\mathrm{Aw}}\end{array}\right.---\left(1\right)$

In formula $\begin{array}{c}\mathrm{\ΔX}=({\mathrm{\ΔX}}_A+\mathrm{\Δ}{X}_{\mathrm{nl}}/3)({\mathrm{\ΔX}}_B+{\mathrm{\ΔX}}_{\mathrm{nl}}/3)+({\mathrm{\ΔX}}_A+{\mathrm{\ΔX}}_{\mathrm{nl}}/3)(\mathrm{\Δ}{X}_C+\mathrm{\Δ}{X}_{\mathrm{nl}}/3)\\ +({\mathrm{\ΔX}}_B+{\mathrm{\ΔX}}_{\mathrm{nl}}/3)({\mathrm{\ΔX}}_C+{\mathrm{\ΔX}}_{\mathrm{nl}}/3)\end{array}$

2) row are write secondary arc current I under A phase single phase ground fault _jwith coupling parameter matrix relationship formula, perfect phase voltage U _b, U _c, U _u, U _v, U _w, U _a, U _b, U _c, U _u, U _v, U _wrepresent, A phase secondary arc current:

$\begin{array}{c}{I}_{\mathrm{jA}}=U_B/X_{\mathrm{AB}}^{\′}+U_C/X_{\mathrm{AC}}^{\′}+U_U/X_{\mathrm{AU}}^{\′}+U_V/X_{\mathrm{AV}}^{\′}\\ +U_W/X_{\mathrm{AW}}^{\′}+U_a/X_{\mathrm{Aa}}^{\′}+U_b/X_{\mathrm{Ab}}^{\′}+U_c/X_{\mathrm{Ac}}^{\′}\\ +U_u/X_{\mathrm{Au}}^{\′}+U_v/X_{\mathrm{Av}}^{\′}+U_w/X_{\mathrm{Aw}}^{\′}\end{array}---\left(2\right)$

Can find out now, secondary arc current is to take the function that high resistance reactance in parallel is independent variable, for reducing the problem of distributing high resistance in parallel and little reactance parameter rationally for the electric arc arcing time of diving, changes into the problem of asking for each circuit secondary arc current optimal solution.

3) the upper and lower margin of computing equipment line build-out degree and the secondary arc current maximum I that meets high speed automatic reclosing requirement _max.I _maxit is the secondary arc current maximum requiring for meeting single-phase high speed automatic reclosing.For extra high voltage network, I _maxbe no more than 20A.

4) according to formula (3), obtain and optimize rear optimal compensation scheme

$\left\{\begin{array}{c}{\left|I_{\mathrm{jm}}\left(\mathrm{\Δ}{X}_i\right)\right|}^2-I_{\max }\≤0\\ \underset{L,\mathrm{\Δy}}{\min }{I}_{\max }\\ {\mathrm{\β}}_{\min }\≤\mathrm{\β}\≤{\mathrm{\β}}_{\max }\end{array}\right.---\left(3\right)$

Δ X in formula (3) _i={ Δ X _a, Δ X _b, Δ X _c, Δ X _u, Δ X _v, Δ X _w, Δ X _a, Δ X _b, Δ X _c, Δ X _u, Δ X _v, Δ X _w, Δ X _n, β=X _c1x _ifor shunt reactor positive sequence compensation degree, wherein X _c1for the capacitive reactance of circuit positive sequence, β _min, β _maxthe restrictive condition of the problems such as comprehensive over-voltage suppression to compensativity.

5) shunt reactor and little reactance parameter are distributed rationally and can significantly be limited secondary arc current and recovery voltage amplitude.

The present invention is not only confined to above-mentioned embodiment; those skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement the present invention; therefore; every employing project organization of the present invention and thinking; do some simple designs that change or change, all fall into the scope of protection of the invention.

Claims (2)

1. limit the reactor Optimal Configuration Method of ultra-high/extra-high voltage coupling circuit secondary arc current, it is characterized in that: comprise the following steps:

Determine initial parameter matrix;

According to fault type row, write secondary arc current I under different faults mode _jwith coupling parameter matrix relationship formula;

The upper and lower margin of computing equipment line build-out degree and the secondary arc current maximum I that meets high speed automatic reclosing requirement _max;

Simultaneous analytical model solves, and according to secondary arc current, obtains and optimizes post-compensation allocation plan.

2. according to the reactor Optimal Configuration Method of the restriction ultra-high/extra-high voltage coupling circuit secondary arc current described in 1 as requested, it is characterized in that: described initial parameter matrix, refer to determine multi-circuit lines on the same tower conductor arrangement mode, line length and line parameter circuit value, form initial parameter matrix.