CN109521321A - A kind of offset voltage prediction technique that controllable voltage source compensates entirely - Google Patents

A kind of offset voltage prediction technique that controllable voltage source compensates entirely Download PDF

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CN109521321A
CN109521321A CN201910089407.9A CN201910089407A CN109521321A CN 109521321 A CN109521321 A CN 109521321A CN 201910089407 A CN201910089407 A CN 201910089407A CN 109521321 A CN109521321 A CN 109521321A
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voltage
phase angle
phase
difference
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CN109521321B (en
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刘红文
王科
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Electric Power Research Institute of Yunnan Power System Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing

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  • Engineering & Computer Science (AREA)
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  • Theoretical Computer Science (AREA)
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Abstract

本申请提供了一种可控电压源全补偿的补偿电压预测方法，在可控电压源接地电流全补偿的各种拓扑结构下均能快速准确的计算单相接地时可控电压源补偿输出值，计算方法快速、有效、简便，能很好的适用于实际的配电网系统。

This application provides a compensation voltage prediction method for full compensation of controllable voltage source, which can quickly and accurately calculate the output value of controllable voltage source compensation for single-phase grounding under various topological structures of full compensation of controllable voltage source grounding current The calculation method is fast, effective, and simple, and can be well applied to the actual distribution network system.

Description

A kind of offset voltage prediction technique that controllable voltage source compensates entirely
Technical field
This application involves the full compensation technique field of power grid single-phase earthing more particularly to a kind of benefits that controllable voltage source compensates entirely Repay voltage-prediction method.
Background technique
In network system, especially in low and medium voltage distribution network system, singlephase earth fault accounts for the absolute majority of failure sum. The neutral grounding mode of low and medium voltage distribution network mainly have isolated neutral mode, neutral by arc extinction coil grounding mode or Neutral point is through low resistance earthing mode.Under isolated neutral mode, earth current is not compensated for and operates with failure, In the presence of person electric shock risk.Under neutral by arc extinction coil grounding mode, arc suppression coil is grounded in single-phase earthing post-compensation holds stream, Ground arc can be extinguished, system can operate with failure, but there are still certain ground connection residual flows for grounding point, and there are still person electric shock wind Danger.Neutral point is through passing through the route zero-sequenceprotection tripping ground path of protective relaying device, power supply under low resistance earthing mode Reliability cannot ensure.The earth current of network system compensates entirely, can be in single-phase earthing, by grounding point current compensation to pole Small value, system can still operate with failure, and eliminate the personal Danger Electric shock risk of grounding point, but the compensation that existing electric current compensates entirely Voltage determines method complexity, is difficult to apply to actual distribution network system.
Summary of the invention
It is complete to solve existing electric current this application provides a kind of offset voltage prediction technique that controllable voltage source compensates entirely The problem of offset voltage of compensation determines method complexity, is difficult to apply to actual distribution network system.
This application provides a kind of offset voltage prediction technique that controllable voltage source compensates entirely, it is applied to use controllable voltage The determination of the source progress full offset voltage of distribution net work earthing fault, which comprises
The phase angle and amplitude of the initial voltage of three-phase voltage are obtained, the initial voltage is that ground fault does not occur mutually for target Voltage；
The difference for calculating the phase angle of the phase angle of the initial voltage of target phase and the initial voltage of remaining two-phase, obtains the first phase Angular difference value and the second phase angle difference, the target are mutually any phase in three phase mains；
According to the first phase angle difference and the second phase angle difference, the absolute value and second of the first phase angle difference is calculated The difference of the absolute value of phase angle difference obtains third phase angle difference value；
The controllable voltage source output initial detecting voltage is controlled, and obtains the voltage magnitude and phase of initial detecting voltage Angle；
According to preset adjusting step-length, the phase of the initial detecting voltage is adjusted, measures the voltage phase of corresponding three-phase Angle；
The difference for calculating separately the voltage phase angle of the voltage phase angle of the target phase measured and remaining two-phase of measurement, obtains To the 4th phase angle difference and the 5th phase angle difference；
According to the 4th phase angle difference and the 5th phase angle difference, the absolute value and the 5th of the 4th phase angle difference is calculated The difference of the absolute value of phase angle difference obtains the 6th phase angle difference；
Judge whether the absolute value of the 6th phase angle difference is less than the absolute value of third phase angular difference value, if so, According to adjustment obtain controllable voltage source detection voltage phase angle and target phase initial voltage phase angle and voltage magnitude, The voltage magnitude and phase angle of the offset voltage of controllable voltage source is calculated；If it is not, then jumping to adjustment initial detecting voltage The step of phase.
Further, the preset formula is
Wherein, UphFor the voltage magnitude of the initial voltage of target phase,For the detection electricity for adjusting obtained controllable voltage source The phase angle of pressure,For the phase angle of the initial voltage of target phase, Ucom is the voltage magnitude of the offset voltage of controllable voltage source, ∠ Ucom is the phase angle of the offset voltage of controllable voltage source.
Further, the preset adjusting step-length is between 0.01 ° -0.5 °.
Further, the frequency of the initial detecting voltage is 50Hz, voltage magnitude 100V-1000V.
Further, the controllable voltage source is parallel with arc suppression coil.
From the above technical scheme, this application provides a kind of offset voltage prediction sides that controllable voltage source compensates entirely Method, it is controllable when fast and accurately can calculate single-phase earthing under the various topological structures that controllable voltage source earth current compensates entirely Voltage source compensates output valve, and calculation method is quick, effective, easy, can be suitable for actual distribution network system well.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor, It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram for one embodiment of compensation circuit that the controllable voltage source of the application application compensates entirely；
Fig. 2 is the circuit diagram for another embodiment of compensation circuit that the controllable voltage source of the application application compensates entirely；
Fig. 3 is a kind of flow chart for the offset voltage prediction technique that controllable voltage source compensates entirely provided by the present application.
Specific embodiment
Referring to Fig. 1, this application provides a kind of offset voltage prediction techniques that controllable voltage source compensates entirely, are applied to application In the determination for carrying out the full offset voltage of distribution net work earthing fault using controllable voltage source, physical circuit includes controllable voltage source, becomes Depressor and three phase mains, the controllable voltage source are connect by transformer with three phase mains.Preferably, controllable voltage source is parallel with Arc suppression coil, physical circuit can be found in Fig. 2, wherein UA、UBAnd UCFor A, B and C phase of three-phase voltage.
Referring to Fig. 3, another embodiment of the application is based on foregoing circuit, provides the compensation electricity that controllable voltage source compensates entirely Pressure prediction method, includes the following steps:
Step 31: obtaining the phase angle and amplitude of the initial voltage of three-phase voltage, the initial voltage is that target does not occur mutually The voltage of ground fault.
Step 32: calculating the difference of the phase angle of the phase angle of the initial voltage of target phase and the initial voltage of remaining two-phase, obtain To the first phase angle difference and the second phase angle difference, the target is mutually any phase in three phase mains.
Step 33: according to the first phase angle difference and the second phase angle difference, calculating the absolute of the first phase angle difference The difference of value and the absolute value of the second phase angle difference, obtains third phase angle difference value.
Step 34: controlling the controllable voltage source output initial detecting voltage, and obtain the voltage amplitude of initial detecting voltage Value and phase angle.The frequency of initial detecting voltage is 50Hz, voltage magnitude 100V-1000V.
Step 35: according to preset adjusting step-length, adjusting the phase of the initial detecting voltage, measure corresponding three-phase Voltage phase angle.Specifically, preset adjusting step-length is between 0.01 ° -0.5 °.
Step 36: calculating separately the voltage phase angle of the voltage phase angle of the target phase measured and remaining two-phase of measurement Difference obtains the 4th phase angle difference and the 5th phase angle difference.
Step 37: according to the 4th phase angle difference and the 5th phase angle difference, calculating the absolute of the 4th phase angle difference The difference of value and the absolute value of the 5th phase angle difference, obtains the 6th phase angle difference.
Step 38: judge whether the absolute value of the 6th phase angle difference is less than the absolute value of third phase angular difference value, If so, thening follow the steps 39；If it is not, going to step 35.
Step 39: according to the initial voltage for the phase angle for detecting voltage and target phase for adjusting obtained controllable voltage source The voltage magnitude and phase angle of the offset voltage of controllable voltage source is calculated in phase angle and voltage magnitude.
Specifically, preset formula is
Wherein, UphFor the voltage magnitude of the initial voltage of target phase,For the detection electricity for adjusting obtained controllable voltage source The phase angle of pressure,For the phase angle of the initial voltage of target phase, Ucom is the voltage magnitude of the offset voltage of controllable voltage source, ∠ Ucom is the phase angle of the offset voltage of controllable voltage source.
From the above technical scheme, this application provides a kind of offset voltage prediction sides that controllable voltage source compensates entirely Method, it is controllable when fast and accurately can calculate single-phase earthing under the various topological structures that controllable voltage source earth current compensates entirely Voltage source compensates output valve, and calculation method is quick, effective, easy, can be suitable for actual distribution network system well.

Claims (5)

1.一种可控电压源全补偿的补偿电压预测方法，应用于采用可控电压源进行配电网接地故障全补偿电压的确定，其特征在于，所述方法包括：1. A compensation voltage prediction method for full compensation of a controllable voltage source, applied to the determination of a full compensation voltage for distribution network ground faults using a controllable voltage source, characterized in that the method comprises: 获取三相电压的初始电压的相角和幅值，所述初始电压为目标相未发生接地故障的电压；Obtaining the phase angle and amplitude of the initial voltage of the three-phase voltage, where the initial voltage is the voltage at which no ground fault occurs in the target phase; 计算目标相的初始电压的相角与其余两相的初始电压的相角的差值，得到第一相角差值和第二相角差值，所述目标相为三相电源中的任一相；The angle of the initial voltage of the initial voltage of the target phase is the difference between the angle of the initial voltage of the other two phases. Mutually; 根据所述第一相角差值和第二相角差值，计算所述第一相角差值的绝对值与第二相角差值的绝对值的差值，得到第三相角差值；According to the first phase angle difference and the second phase angle difference, calculate the difference between the absolute value of the first phase angle difference and the absolute value of the second phase angle difference to obtain a third phase angle difference 控制所述可控电压源输出初始检测电压，并获取初始检测电压的电压幅值和相角；controlling the controllable voltage source to output an initial detection voltage, and obtaining the voltage amplitude and phase angle of the initial detection voltage; 按照预设的调节步长，调整所述初始检测电压的相位，测量对应的三相的电压相角；Adjusting the phase of the initial detection voltage according to the preset adjustment step size, and measuring the voltage phase angle of the corresponding three phases; 分别计算得到测量的目标相的电压相角与测量的其余两相的电压相角的差值，得到第四相角差值和第五相角差值；The difference between the voltage phase angle of the measured target phase and the voltage phase angle of the measured target phase of the measured target phase, respectively, to obtain the difference between the fourth phase angle and the fifth phase angle difference; 根据所述第四相角差值和第五相角差值，计算所述第四相角差值的绝对值与第五相角差值的绝对值的差值，得到第六相角差值；According to the difference between the absolute value of the fourth phase angle difference and the absolute value of the fifth phase angle, the difference between the six -phase angle difference is calculated. 判断所述第六相位角差值的绝对值是否小于第三相位角差值的绝对值，若是，则根据调整得到的可控电压源的检测电压的相角以及目标相的初始电压的相角和电压幅值，计算得到可控电压源的补偿电压的电压幅值和相角；若否，则跳转至调整初始检测电压的相位的步骤。Determine whether the absolute value of the six -phase angle difference is less than the absolute value of the difference between the third phase angle. With voltage amplitude, calculate the voltage amplitude and phase angle of the compensation voltage of the controllable voltage source; if not, jump to the step of adjusting the phase of the initial detection voltage. 2.如权利要求1所述的方法，其特征在于，所述预设公式为2. The method according to claim 1, wherein the preset formula is 其中，Uph为目标相的初始电压的电压幅值，为调整得到的可控电压源的检测电压的相角，为目标相的初始电压的的相角，Ucom为可控电压源的补偿电压的电压幅值，∠Ucom为可控电压源的补偿电压的相角。Among them, U pH is the voltage amplitude of the initial voltage of the target phase, In order to adjust the angle of the detection voltage of the controlled voltage source, is the phase angle of the initial voltage of the target phase, Ucom is the voltage amplitude of the compensation voltage of the controllable voltage source, and ∠Ucom is the phase angle of the compensation voltage of the controllable voltage source. 3.如权利要求1所述的方法，其特征在于，所述预设的调节步长在0.01°-0.5°之间。3. The method according to claim 1, characterized in that the preset adjustment step is between 0.01°-0.5°. 4.如权利要求1所述的方法，其特征在于，所述初始检测电压的频率为50Hz，电压幅值为100V-1000V。4. The method of claim 1 is characterized by the frequency of the initial detection voltage of 50Hz and the voltage amplitude of 100V-1000V. 5.如权利要求1所述的方法，其特征在于，所述可控电压源并联有消弧线圈。5. The method according to claim 1, wherein the controllable voltage source is connected in parallel with an arc suppression coil.
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