CN106970293A - A kind of high-voltage bidirectional traction power set power device open circuit fault diagnostic device and its method - Google Patents

Abstract

The invention discloses a kind of high-voltage bidirectional traction power set power device open circuit fault diagnostic device and its method.It includes concatenating the three-phase circuit that constitutes respectively by resistance and inductance and by two electric capacity DC circuit in series, there is exchange neutral point N in three-phase circuit, there is DC point O in DC circuit, voltage sensor is connected with three-phase circuit, voltage sensor can be used for measuring voltage u_u‑、u_v‑Or u_w‑Numerical value and by calculate obtain u_no, and then obtain its standardization averageThe standardization average of voltage between exchange neutral point N and DC point O can be recognized to the current failure feature and voltage failure feature of high-voltage bidirectional traction power set.After said structure and method, the influence that DC load mutation is caused to current failure feature identification process can be suppressed, misdiagnosis rate is reduced；Fault element positioning is realized, it is accurately positioned, and diagnosis process institute only needs to increase voltage sensor according to data, cost is low, and availability is strong.

Description

A kind of high-voltage bidirectional traction power set power device open circuit fault diagnostic device and its Method

Technical field

The present invention relates to a kind of fault diagnosis technology of urban track traffic mesohigh bivector traction electric supply installation, specifically Say it is a kind of high-voltage bidirectional traction power set power device open circuit fault diagnostic device and its method.

Background technology

Most of high-voltage bidirectional traction power set major loop failure is presented as structural failure, and most common of which is work( Rate device fault.The failure of power device can be divided into two classes：Through failure and open circuit fault.For high-voltage bidirectional traction power supply dress For putting, the protection of its major loop under normal circumstances is that excessively stream and overpressure condition by input side or outlet side are tactile to realize Hair, and then be controlled by it the driving pulse of system lock power device and cut off itself and input side and the miscellaneous equipment of outlet side Between contact to prevent the expansion of fault coverage.Under this major loop protected mode, run through failure for power device For, because it can trigger significantly over-current phenomenon avoidance so that diagnose and protect it is very easy；Open circuit event to power device For barrier, because it will not trigger significantly excessively stream or overvoltage, under-voltage phenomenon under normal circumstances, it is therefore desirable to carry out failure to it and examine It is disconnected, and go trigger protection to act using the result of diagnosis, realize the isolation of failure.In the diagnosis side of power device open circuit fault Face, traditional artificial trouble shoot method is completely dependent on the commissioning experience of operating personnel, interval between diagnosis length and it is difficult to ensure that examines The accuracy of disconnected result, thus its automatic detection and diagnostic method are particularly important.

The content of the invention

High-voltage bidirectional traction power set power device can be realized the technical problem to be solved in the present invention is to provide one kind The pinpoint bivector traction electric supply installation power device open circuit fault diagnostic device and its method of open circuit fault.

In order to solve the above-mentioned technical problem, bivector traction electric supply installation power device open circuit fault of the invention diagnosis dress Put, including concatenate the three-phase circuit constituted respectively by resistance and inductance and by two electric capacity DC circuit in series, Have to have in exchange neutral point N, DC circuit in three-phase circuit and be connected with DC point O, three-phase circuit Voltage sensor, the voltage sensor can be used for measuring voltage u_u-、u_v-Or u_w-Numerical value and by calculate obtain u_no, enter And obtain its standardization averageThe standardization average for exchanging the voltage between neutral point N and DC point O can be to high pressure The current failure feature and voltage failure feature of bivector traction electric supply installation are recognized.

A kind of diagnostic method using above-mentioned bivector traction electric supply installation power device open circuit fault diagnostic device, including with Lower step：

1)Detection and computational methods

Shown in the analytical expression of high-voltage bidirectional traction power set such as formula (1)；Wherein, R is high-voltage bidirectional traction power supply The AC distributed resistance of device, L is the Inductor of high-voltage bidirectional traction power set；

Various summation in formula (1) can be obtained：

There is i under three-phase three-wire system mode_A+i_B+i_C=0, and for the line voltage u of three-phase equilibrium_un、u_vnAnd u_wn, have u_un+u_vn+u_wn=0, so as to have：

Then

Using above-mentioned u_noMethod for solving u is measured by voltage sensor_u-、u_v-Or u_w-, and then obtained by calculating u_no, and then its standardization average just can be obtained by dynamic window average algorithm

2)WithDetection and computational methods

Selected base value is alternating current net side current space vector amplitude when standardization is carried out to alternating current net side electric currentWherein i_dAnd i_qFor component of the current on line side on two-phase rotating coordinate system d axles and q axles, specifically provided by (7)；

Choose alternating current net side current space vector amplitudeIt is used as carry out standardization of the base value to alternating current net side electric current After take average, shown in the equal value expression of the standardization such as formula (8) of three-phase current；

3) threshold value of standardization averaging method is chosen

According to the description in above-mentioned to standardization averaging method, its failure code is established rules then as follows really：

Wherein, λ₊、λ_-、σ₊And σ_-It is flag bit A and B respectively_vThe positive and negative threshold value of (v=a, b, c).Threshold value λ₊、λ_-、σ₊ And σ_-Multiple evaluation indexes are needed to refer to during selection to realize global optimum；Each threshold value is chosen as follows：

4) the fault element locating rule of standardization averaging method, to corresponding between fault element and failure code.

After above-mentioned structures and methods, DC load mutation pair can be suppressed by the identification to voltage failure feature The influence that current failure feature identification process is caused, reduces misdiagnosis rate；Use respectively in alternating current net side fault current and alternating current-direct current Current failure feature and voltage failure feature of the standardization average of voltage between property point to high-voltage bidirectional traction power set Recognized；Exist to correspond between the fault signature and fault element that pick out using above-mentioned two standardization average and close System, this one-to-one relationship is encoded and simplified, the then knowledge expression of formation rule, and being realized with this Fault element is positioned, and it is accurately positioned, and the data of diagnosis process institute foundation only need to increase a voltage sensor, cost Low, availability is strong.

Brief description of the drawings

Fig. 1 is the schematic diagram of bivector traction electric supply installation power device open circuit fault diagnostic device of the present invention.

Embodiment

With reference to the accompanying drawings and detailed description, to the bivector traction electric supply installation power device open circuit fault of the present invention Diagnostic device and its method are described in further detail.

As illustrated, the bivector traction electric supply installation power device open circuit fault diagnostic device of the present invention, including by resistance Concatenate the three-phase circuit of composition respectively with inductance and in two electric capacity DC circuit in series, three-phase circuit With exchange neutral point N, have in DC circuit on DC point O, three-phase circuit and be connected with voltage sensor, voltage Sensor can be used for measuring voltage u_u-、u_v-Or u_w-Numerical value and by calculate obtain u_no, and then obtain its standardization averageThe standardization average for exchanging the voltage between neutral point N and DC point O can be to high-voltage bidirectional traction power set Current failure feature and voltage failure feature recognized.

The high-voltage bidirectional traction power set power device open circuit fault diagnostic device of the present invention is installed on high-voltage bidirectional and led Draw inside electric supply installation, by detecting the alternating current, alternating voltage, DC voltage of high-voltage bidirectional traction power set, use The form of standardization average therefrom extracts high-voltage bidirectional traction power set power device open circuit fault feature, then completes to occur The position fixing process of the power device of open circuit fault；Specific data processing and failure diagnostic process are as follows：

The voltage u between neutral point N and DC point O is exchanged using high-voltage bidirectional traction power set_noStandardization AverageAnd alternating current net side electric current i_a、i_bAnd i_cStandardization averageWithAs fault characteristic value, (wherein N is height The equivalent neutral point of bivector traction electric supply installation AC is pressed, O is the equivalent neutral point of high-voltage bidirectional traction power set DC side).

1)Detection and computational methods

Shown in the analytical expression such as formula (1) of three-phase three-wire system high-voltage bidirectional traction power set.Wherein, R is that high pressure is double To the AC distributed resistance of traction power set, L is the Inductor of high-voltage bidirectional traction power set；

Various summation in formula (1) can be obtained：

There is i under three-phase three-wire system mode_A+i_B+i_C=0, and for the line voltage u of three-phase equilibrium_un、u_vnAnd u_wn, have u_un+u_vn+u_wn=0, so as to have：

Then

Using this u_noMethod for solving one voltage sensor of increase is only needed on the basis of original to measure u_u-、 u_v-Or u_w-U can be obtained by calculating_no, and then its standardization average just can be obtained by dynamic window average algorithmNeed Illustrate, due to u_noSize with DC load is unrelated, so taking base value to be 1 during its standardization.

2)WithDetection and computational methods

Selected base value is alternating current net side current space vector amplitude when standardization is carried out to alternating current net side electric currentWherein i_dAnd i_qFor component of the current on line side on two-phase rotating coordinate system d axles and q axles, specifically provided by (7)；

Choose alternating current net side current space vector amplitudeIt is used as carry out standardization of the base value to alternating current net side electric current After take average, shown in the equal value expression of the standardization such as formula (8) of three-phase current.

3) threshold value of standardization averaging method is chosen

According to description above to standardization averaging method, its failure code is established rules then as follows really：

Wherein, λ₊、λ_-、σ₊And σ_-It is flag bit A and B respectively_vThe positive and negative threshold value of (v=a, b, c).Threshold value λ₊、λ_-、σ₊ And σ_-Multiple evaluation indexes are needed to refer to during selection to realize global optimum.Each threshold value is chosen as follows：

4) the fault element locating rule of standardization averaging method

Corresponding relation between fault element and failure code is as shown in table 1.

The failure code table of table 1

Note：" X " in table represents that this amount is unrelated amount.

Claims (2)

1. a kind of bivector traction electric supply installation power device open circuit fault diagnostic device, it is characterised in that：Including by resistance and electricity Sense concatenates the three-phase circuit of composition and in two electric capacity DC circuit in series, the three-phase circuit respectively With exchange neutral point N, have in the DC circuit and voltage biography is connected with DC point O, the three-phase circuit Sensor, the voltage sensor can be used for measuring voltage u_u-、u_v-Or u_w-Numerical value and by calculate obtain u_no, and then obtain Its standardization averageThe standardization average of voltage between the exchange neutral point N and DC point O can be to high pressure The current failure feature and voltage failure feature of bivector traction electric supply installation are recognized.

2. the diagnosis side of bivector traction electric supply installation power device open circuit fault diagnostic device described in a kind of use claim 1 Method, it is characterised in that comprise the following steps：

1)Detection and computational methods

Shown in the analytical expression of high-voltage bidirectional traction power set such as formula (1)；Wherein, R is high-voltage bidirectional traction power set AC distributed resistance, L be high-voltage bidirectional traction power set Inductor；

$\left\{\begin{array}{c}{u}_{un}+u_{no}=L\·\frac{d}{dt}{i}_a+R\·i_a+u_{ao}\\ u_{vn}+u_{no}=L\·\frac{d}{dt}{i}_b+R\·i_b+u_{bo}\\ u_{wn}+u_{no}=L\·\frac{d}{dt}{i}_c+R\·i_c+u_{co}\end{array}\right.---\left(1\right)$

Various summation in formula (1) can be obtained：

$u_{un}+u_{vn}+u_{wn}+3u_{no}=L\frac{d}{dt}\left(\underset{j=a}{\overset{c}{\Σ}}{i}_j\right)+R\underset{j=a}{\overset{c}{\Σ}}{i}_j+u_{ao}+u_{bo}+u_{co}---\left(2\right)$

There is i under three-phase three-wire system mode_A+i_B+i_C=0, and for the line voltage u of three-phase equilibrium_un、u_vnAnd u_wn, there is u_un+u_vn +u_wn=0, so as to have：

$u_{no}=\frac{1}{3}(u_{a-}+u_{b-}+u_{c-})-\frac{1}{2}{U}_{dc}---\left(3\right)$

Then

$u_{no}=u_{uo}-\frac{2}{3}{u}_{uv}-\frac{1}{3}{u}_{vw}=u_{u-}-\frac{2}{3}{u}_{uv}-\frac{1}{3}{u}_{vw}-\frac{1}{2}{U}_{dc}---\left(4\right)$

$u_{no}=u_{v-}+\frac{1}{3}{u}_{uv}-\frac{1}{3}{u}_{vw}-\frac{1}{2}{U}_{dc}---\left(5\right)$

$u_{no}=u_{w-}+\frac{1}{3}{u}_{uv}+\frac{2}{3}{u}_{vw}-\frac{1}{2}{U}_{dc}---\left(6\right)$

Using above-mentioned u_noMethod for solving u is measured by voltage sensor_u-、u_v-Or u_w-, and then obtain u by calculating_no, enter And its standardization average just can be obtained by dynamic window average algorithm

2)WithDetection and computational methods

Selected base value is alternating current net side current space vector amplitude when standardization is carried out to alternating current net side electric currentIts Middle i_dAnd i_qFor component of the current on line side on two-phase rotating coordinate system d axles and q axles, specifically provided by (7)；

$\left(\begin{array}{c}{i}_d\\ i_q\end{array}\right)=\frac{2}{3}\left(\begin{array}{ccc}\cos \mathrm{\θ}& \cos (\mathrm{\θ}-\frac{2}{3}\mathrm{\π})& \cos (\mathrm{\θ}-\frac{4}{3}\mathrm{\π})\\ \sin \mathrm{\θ}& \sin (\mathrm{\θ}-\frac{2}{3}\mathrm{\π})& \sin (\mathrm{\θ}-\frac{4}{3}\mathrm{\π})\end{array}\right)\left(\begin{array}{c}{i}_a\\ i_b\\ i_c\end{array}\right)---\left(7\right)$

Choose alternating current net side current space vector amplitudeAs base value to being taken after the carry out standardization of alternating current net side electric current Value, shown in the equal value expression of the standardization such as formula (8) of three-phase current；

$\left\{\begin{array}{c}\stackrel{\‾}{i_a^{*}}=\stackrel{\‾}{\frac{i_a}{\sqrt{i_d^2+i_q^2}}}\\ \stackrel{\‾}{i_b^{*}}=\stackrel{\‾}{\frac{i_b}{\sqrt{i_d^2+i_q^2}}}\\ \stackrel{\‾}{i_c^{*}}=\stackrel{\‾}{\frac{i_c}{\sqrt{i_d^2+i_q^2}}}\end{array}\right.---\left(8\right)$

3) threshold value of standardization averaging method is chosen

According to the description in above-mentioned to standardization averaging method, its failure code is established rules then as follows really：

$A=\left\{\begin{array}{cc}+1& \stackrel{\&OverBar;}{u_{no}^{*}}>{\mathrm{\&lambda;}}_{+}\\ -1& \stackrel{\&OverBar;}{u_{no}^{*}}<{\mathrm{\&lambda;}}_{-}\end{array}\right.---\left(9\right)$

$B_v=\left\{\begin{array}{cc}+1& \stackrel{\&OverBar;}{i_v^{*}}>{\mathrm{\&sigma;}}_{+}\\ -1& \stackrel{\&OverBar;}{i_v^{*}}<{\mathrm{\&sigma;}}_{-}\end{array}\right.---\left(10\right)$

Wherein, λ₊、λ_-、σ₊And σ_-It is flag bit A and B respectively_vThe positive and negative threshold value of (v=a, b, c).Threshold value λ₊、λ_-、σ₊And σ_- Multiple evaluation indexes are needed to refer to during selection to realize global optimum；Each threshold value is chosen as follows：

$\left\{\begin{array}{c}{\mathrm{\&lambda;}}_{+}=11\\ {\mathrm{\&lambda;}}_{-}=-11\end{array}\right.,\left\{\begin{array}{c}{\mathrm{\&sigma;}}_{+}=0.1\\ {\mathrm{\&sigma;}}_{-}=-0.1\end{array}\right.---(3-17)$

4) the fault element locating rule of standardization averaging method, to corresponding between fault element and failure code.