CN104092201A - Remote ultra-high voltage alternating-current transmission line fault determination method - Google Patents

Abstract

The invention discloses a remote ultra-high voltage alternating-current transmission line fault determination method. The method comprises the steps that voltage and current travelling wave components at each sampling moment at protection installation positions at the two ends of an ultra-high voltage alternating-current transmission line are collected at first, the influence of line losses is calculated, the travelling wave electrical quantity at each sampling moment is utilized for calculating the current travelling wave component at one end of the ultra-high voltage alternating-current transmission line through a prediction algorithm, then a distributed capacitance current along the ultra-high voltage alternating-current transmission line is used as a braking current, the vector sum of the current travelling wave component, obtained through calculation, at one end of the ultra-high voltage alternating-current transmission line and the current travelling wave component, obtained through sampling, at the end of the ultra-high voltage alternating-current transmission line is used as a difference current, and phase splitting is carried out to form main protection of the ultra-high voltage alternating-current transmission line. According to the remote ultra-high voltage alternating-current transmission line fault determination method, the current travelling wave components at each sampling moment does not need to be solved through interpolation operation, the operand of current travelling wave protection is reduced, the movement speed of current travelling wave differential protection is improved, and the remote ultra-high voltage alternating-current transmission line fault determination method is applicable to ultra-high voltage alternating-current transmission line replay protection under different operating environments and circuit parameters.

Description

Remote ultrahigh voltage alternating current transmission lines fault distinguishing method

Technical field

The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of remote ultrahigh voltage alternating current transmission lines fault distinguishing method.

Background technology

Owing to not affected by system operation mode and electric network composition and having natural phase-selecting function, current differential protection is the main protection of various electric pressure transmission lines always.In 220kV and following electric pressure transmission line, because transmission line capacitance current along the line is very little, distributed capacitance is very little on the impact of current differential protection performance.But; the voltage of ultrahigh voltage alternating current transmission lines, current delivery have obvious wave process; capacitance current along the line is very large; utilize the amplitude of the vector of two ends fundamental frequency steady-state current component to be faced with current differential protection starting current as the conventional current differential protection of actuating quantity large; and in order to prevent from protecting malfunction; improve startup set point and can cause again protecting sensitivity deficiency, restricting the application of conventional current differential protection on ultrahigh voltage alternating current transmission lines.

Considered the impact of distributed capacitance based on distributed parameter model transmission line current differential protection algorithm; performance is not subject to the impact of capacitance current; but need to design the hyperbolic functions computing of large amount of complex, hyperbolic functions are difficult for realizing in microcomputer code, practical difficulty.Traveling-wave differential protection has been considered the impact of distributed capacitance in protection algorithm mathematics model, is not subject to the impact of transmission line distributed capacitance in traveling-wave differential protection principle, has very high performance.Application number 200910034669.1 patents of invention " are applicable to the traveling-wave differential protection method of series capacitor compensated line " and have solved the impact of distributed capacitance on differential protection performance; but the situation that is the non-integral multiple sampling interval for row ripple propagation delay; need to obtain the electric parameters on each time point by interpolation arithmetic; very high to the requirement of protective device sample frequency; therefore very high to protective device hardware requirement; and each sampling time will be carried out interpolation arithmetic; the required operand of protection algorithm itself is large, cannot meet the requirement of protection quick-action.The situation that " traveling-wave differential protection of UHV Transmission Line with Shunt Reactor " of Su Bin, Dong Xinzhou and Sun Yuan Zhang Fabiao and " based on the traveling-wave differential protection of wavelet transformation " of Su Bin, Dong Xinzhou and Sun Yuan Zhang Fabiao and application number 200410079501.X patent of invention " detection method of voltage zero cross near fault in travelling wave protection " are the non-integral multiple sampling interval for row ripple propagation delay also needs to obtain the electric parameters on each time point by interpolation arithmetic, exists equally the problem that operand is large; Need to carry out wavelet transformation, desired data window is large, and protection detects that fault generation required time is long.

At present; the situation that the transmission line travelling wave differential protecting method that many scholars have proposed is the non-integral multiple sampling interval to row ripple propagation delay all needs to carry out interpolation arithmetic and asks the electric parameters on its each time point; the operand of protection algorithm own is large, high to protective device sampling hardware requirement.Wherein part transmission line travelling wave differential protecting method even needs to carry out wavelet transformation, and desired data window is large, has extended protection and the time that fault occurs detected, and cannot meet the requirement of relaying protection to quick-action.

Summary of the invention

The object of the invention is to overcome the deficiency that prior art exists, a kind of remote ultrahigh voltage alternating current transmission lines fault distinguishing method is provided.The inventive method, without the current traveling wave component of asking for each sampling instant by interpolation arithmetic, has reduced current traveling wave protection operand, has improved current traveling wave differential protection responsiveness.The inventive method utilizes ultrahigh voltage alternating current transmission lines capacitance current along the line as stalling current; adjust without carrying out electric current threshold value; can be along with ultrahigh voltage alternating current transmission lines distance, distributed capacitance parameter changes and changes over the ground, is applicable to the ultrahigh voltage alternating current transmission lines relaying protection of various running environment and line parameter circuit value.

The present invention adopts following technical scheme:

Remote ultrahigh voltage alternating current transmission lines fault distinguishing method, comprises following sequential steps:

(1) utilize the traveling wave electric amount that is positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and each sampling instant of n transforming plant protecting installation place calculate t sampling instant m transforming plant protecting installation place 0, α, β mould current traveling wave component i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t):

$\begin{array}{c}{i}_{m0}^{\′}\left(t\right)=\frac{u_{m0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}-\frac{i_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}\\ -i_{n0}\left(t\right)-\frac{i_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}+\frac{u_{n0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\α}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}-\frac{i_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}\\ -i_{\mathrm{n\α}}\left(t\right)-\frac{i_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}+\frac{u_{\mathrm{n\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\β}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}-\frac{i_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}\\ -i_{\mathrm{n\β}}\left(t\right)-\frac{i_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}+\frac{u_{\mathrm{n\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}\end{array}$

Wherein, t is the sampling time; l is the ultrahigh voltage alternating current transmission lines length that connects m transformer station and n transformer station; T is the cycle time of fundamental component; Z _c0, Z _{c α}, Z _{c β}be respectively the characteristic impedance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ν _c0, ν _{c α}, ν _{c β}be respectively the propagation velocity of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ω is electric power system angular frequency; R ₀, R _α, R _βbe respectively the resistance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; u _m0(t), u _{m α}(t), u _{m β}(t) be respectively m transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; u _n0(t), u _{n α}(t), u _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; i _n0(t), i _{n α}(t), i _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the current traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould;

(7) by i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t) carry out phase mould inverse transformation and obtain the three-phase current traveling-wave component i ' of the m transforming plant protecting installation place of t sampling instant _mA(t), i ' _mB(t), i ' _mC(t); To i ' _mA(t), i ' _mB(t), i ' _mC(t) adopt Fourier algorithm to calculate the three-phase Fundamental-frequency Current component of the t sampling instant of m transforming plant protecting installation place

(8) the current traveling wave component i of the three-phase of the m transforming plant protecting installation place to t sampling instant actual measurement _mA(t), i _mB(t), i _mC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place

(9) the current traveling wave component i of the three-phase of the n transforming plant protecting installation place to t sampling instant actual measurement _nA(t), i _nB(t), i _nC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place

(10) judge t sampling instant whether set up, if set up, judge that A phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends;

(11) judge t sampling instant whether set up, if set up, judge that B phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends;

(7) judge t sampling instant whether set up, if set up, judge that C phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.

The present invention compared with prior art, has following positive achievement:

In the time that the transmission time of traveling-wave component on ultrahigh voltage alternating current transmission lines is not the integral multiple of time in sampling interval; the inventive method is without the current traveling wave component of asking for each sampling instant by interpolation arithmetic; reduce current traveling wave protection operand, improved current traveling wave differential protection responsiveness.The inventive method utilizes ultrahigh voltage alternating current transmission lines capacitance current along the line as stalling current; without setting current threshold value; can along with ultrahigh voltage alternating current transmission lines length, over the ground distributed capacitance parameter change and change, be applicable to the ultrahigh voltage alternating current transmission lines relaying protection of different running environment and line parameter circuit value.The inventive method is without relating to complicated hyperbolic functions computing, and amount of calculation is little, fast operation, and protection quick action, is applicable to realize ultrahigh voltage alternating current transmission lines main protection function.

Brief description of the drawings

Fig. 1 is the ultra-high voltage AC transmission system schematic of application the inventive method.

Embodiment

According to Figure of description, technical scheme of the present invention is expressed in further detail below.

Fig. 1 is the ultra-high voltage AC transmission system schematic of application the inventive method.First the present embodiment gathers three-phase voltage traveling-wave component and the three-phase current traveling-wave component of ultrahigh voltage alternating current transmission lines in each sampling instant of m transforming plant protecting installation place; Gather three-phase voltage traveling-wave component and the three-phase current traveling-wave component of ultrahigh voltage alternating current transmission lines in each sampling instant of n transforming plant protecting installation place.

Adopt phase-model transformation by three-phase voltage traveling-wave component, the three-phase current traveling-wave component of each sampling instant of m, n transforming plant protecting installation place convert 0 to, α, β mode voltage traveling-wave component and 0, α, β mould current traveling wave component.

The traveling wave electric amount that utilization is positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and each sampling instant of n transforming plant protecting installation place calculate t sampling instant m transforming plant protecting installation place 0, α, β mould current traveling wave component i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t):

$\begin{array}{c}{i}_{m0}^{\′}\left(t\right)=\frac{u_{m0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}-\frac{i_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}\\ -i_{n0}\left(t\right)-\frac{i_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}+\frac{u_{n0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\α}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}-\frac{i_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}\\ -i_{\mathrm{n\α}}\left(t\right)-\frac{i_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}+\frac{u_{\mathrm{n\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\β}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}-\frac{i_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}\\ -i_{\mathrm{n\β}}\left(t\right)-\frac{i_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}+\frac{u_{\mathrm{n\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}\end{array}$

Wherein, t is the sampling time; l is the ultrahigh voltage alternating current transmission lines length that connects m transformer station and n transformer station; T is the cycle time of fundamental component; Z _c0, Z _{c α}, Z _{c β}be respectively the characteristic impedance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ν _c0, ν _{c α}, ν _{c β}be respectively the propagation velocity of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ω is electric power system angular frequency; R ₀, R _α, R _βbe respectively the resistance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; u _m0(t), u _{m α}(t), u _{m β}(t) be respectively m transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; i _m0(t), i _{m α}(t), i _{m β}(t) be respectively m transforming plant protecting installation place t sampling instant 0, the current traveling wave component of α, β mould; u _n0(t), u _{n α}(t), u _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; i _n0(t), i _{n α}(t), i _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the current traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould.

By i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t) carry out phase mould inverse transformation and obtain the three-phase current traveling-wave component i ' of the m transforming plant protecting installation place of t sampling instant _mA(t), i ' _mB(t), i ' _mC(t).

To i ' _mA(t), i ' _mB(t), i ' _mC(t) adopt Fourier algorithm to calculate the three-phase Fundamental-frequency Current component of the t sampling instant of m transforming plant protecting installation place

The current traveling wave component i of the three-phase actual measurement of the m transforming plant protecting installation place to t sampling instant _mA(t), i _mB(t), i _mC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place

The current traveling wave component i of the three-phase actual measurement of the n transforming plant protecting installation place to t sampling instant _nA(t), i _nB(t), i _nC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place

Judge t sampling instant whether set up, if set up, judge that A phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends;

Judge t sampling instant whether set up, if set up, judge that B phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends;

Judge t sampling instant whether set up, if set up, judge that C phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.

In the time that the transmission time of traveling-wave component on ultrahigh voltage alternating current transmission lines is not the integral multiple of time in sampling interval; the inventive method is without the current traveling wave component of asking for each sampling instant by interpolation arithmetic; reduce current traveling wave protection operand, improved current traveling wave differential protection responsiveness.The inventive method utilizes ultrahigh voltage alternating current transmission lines capacitance current along the line as stalling current; without setting current threshold value; can along with ultrahigh voltage alternating current transmission lines length, over the ground distributed capacitance parameter change and change, be applicable to the ultrahigh voltage alternating current transmission lines relaying protection of different running environment and line parameter circuit value.The inventive method is without relating to complicated hyperbolic functions computing, and amount of calculation is little, and fast operation is applicable to realize ultrahigh voltage alternating current transmission lines main protection function.

The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.

Claims (1)

1. remote ultrahigh voltage alternating current transmission lines fault distinguishing method, is characterized in that, comprises following sequential steps:

(1) utilize the traveling wave electric amount that is positioned at the m transforming plant protecting installation place at ultrahigh voltage alternating current transmission lines two ends and each sampling instant of n transforming plant protecting installation place calculate t sampling instant m transforming plant protecting installation place 0, α, β mould current traveling wave component i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t):

$\begin{array}{c}{i}_{m0}^{\′}\left(t\right)=\frac{u_{m0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}-\frac{i_{m0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}\\ -i_{n0}\left(t\right)-\frac{i_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}+\frac{u_{n0}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))-u_{n0}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_0\right)}{(Z_{c0}+\frac{R_0}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_0\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\α}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}-\frac{i_{\mathrm{m\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}\\ -i_{\mathrm{n\α}}\left(t\right)-\frac{i_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}+\frac{u_{\mathrm{n\α}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))-u_{\mathrm{n\α}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right)}{(Z_{\mathrm{c\α}}+\frac{R_{\mathrm{\α}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\α}}\right))}\end{array}$

$\begin{array}{c}{i}_{\mathrm{m\β}}^{\′}\left(t\right)=\frac{u_{\mathrm{m\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}-\frac{i_{\mathrm{m\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}\\ -i_{\mathrm{n\β}}\left(t\right)-\frac{i_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}+\frac{u_{\mathrm{n\β}}\left(t\right)(1-\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))-u_{\mathrm{n\β}}(t-\frac{T}{4})\sin \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right)}{(Z_{\mathrm{c\β}}+\frac{R_{\mathrm{\β}}}{4})(1+\cos \left(\mathrm{\ω}{\mathrm{\τ}}_{\mathrm{\β}}\right))}\end{array}$

Wherein, t is the sampling time; l is the ultrahigh voltage alternating current transmission lines length that connects m transformer station and n transformer station; T is the cycle time of fundamental component; Z _c0, Z _{c α}, Z _{c β}be respectively the characteristic impedance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ν _c0, ν _{c α}, ν _{c β}be respectively the propagation velocity of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; ω is electric power system angular frequency; R ₀, R _α, R _βbe respectively the resistance of ultrahigh voltage alternating current transmission lines 0, α, β line wave component; u _m0(t), u _{m α}(t), u _{m β}(t) be respectively m transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; u _n0(t), u _{n α}(t), u _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the voltage traveling wave component of α, β mould; i _n0(t), i _{n α}(t), i _{n β}(t) be respectively n transforming plant protecting installation place t sampling instant 0, the current traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the voltage traveling wave component of α, β mould; be respectively m transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould; be respectively n transforming plant protecting installation place sampling instant 0, the current traveling wave component of α, β mould;

(2) by i ' _m0(t), i ' _{m α}(t), i ' _{m β}(t) carry out phase mould inverse transformation and obtain the three-phase current traveling-wave component i ' of the m transforming plant protecting installation place of t sampling instant _mA(t), i ' _mB(t), i ' _mC(t); To i ' _mA(t), i ' _mB(t), i ' _mC(t) adopt Fourier algorithm to calculate the three-phase Fundamental-frequency Current component of the t sampling instant of m transforming plant protecting installation place

(3) the current traveling wave component i of the three-phase of the m transforming plant protecting installation place to t sampling instant actual measurement _mA(t), i _mB(t), i _mC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of m transforming plant protecting installation place

(4) the current traveling wave component i of the three-phase of the n transforming plant protecting installation place to t sampling instant actual measurement _nA(t), i _nB(t), i _nC(t) adopt Fourier algorithm to calculate the Fundamental-frequency Current component of the three-phase actual measurement of the t sampling instant of n transforming plant protecting installation place

(5) judge t sampling instant whether set up, if set up, judge that A phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping A phase ultrahigh voltage alternating current transmission lines two ends;

(6) judge t sampling instant whether set up, if set up, judge that B phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping B phase ultrahigh voltage alternating current transmission lines two ends;

(7) judge t sampling instant whether set up, if set up, judge that C phase ultrahigh voltage alternating current transmission lines breaks down, the circuit breaker at tripping C phase ultrahigh voltage alternating current transmission lines two ends.