Method for identifying faults of transmission line in smart power grid
A transmission line and fault identification technology, applied in the direction of electrical digital data processing, data processing applications, instruments, etc., can solve problems such as simultaneous occurrence, multiple faults, and failure of the power grid to reach quasi-steady conditions, and achieve loose requirements and improve accuracy. Effect
Inactive Publication Date: 2019-11-26
NANJING UNIV OF SCI & TECH
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This method requires that line faults have no influence on each other, and the power grid is in a quasi-steady state before and after the fault. However, when there is a major power outage in the power grid, multiple faults often occur at the same time, and the power grid cannot reach the quasi-steady state.
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[0015] Such as figure 1 As shown, the method for fault identification of transmission lines in smart grid includes the following steps:
[0016] Step 1. Obtain the voltage phase angle, voltage modulus and angular velocity of all nodes through PMUs;
[0017] Step 2. Based on the complex network theory, divide the power grid system into two parts, power supply and load, and model them separately to determine the power transmission network model;
[0018] The grid topology can be described by (N,ε), where the node set N={1,2,...,N} represents all grid subsystems including power sources and loads. where the power supply is represented by nodes 1 to 1 (N g ={1,2,...,l}), the load is represented by nodes l to N+1 (N l ={l+1,...,N}). edge set Representing a transmission line between two nodes |N| represents the cardinality of the set N (similar to |ε|).
[0019] The active power flow equation of the power system from node i to node j is as follows:
[0020]
[0021] In the...
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The invention discloses a method for identifying faults of a transmission line in a smart power grid. The method comprises the following steps: firstly, acquiring voltage phase angles, voltage modulusvalues and angular speeds of all nodes through PMUs; dividing a power grid system into a power supply part and a load part based on a complex dynamic network theory, and establishing a power transmission network model, a response network and a corresponding adaptive updating law; calculating time-varying parameters of the complex power transmission network model based on the response network in combination with the voltage phase angles and angular velocities of all nodes, and estimating coupling weight parameters of the power transmission network model; and finally, calculating a topologicalmatrix of the power transmission network according to the coupling weight parameter in combination with the voltage module value and the inertia coefficient of the node and the frequency dependence coefficient of the load, and determining the position of the fault line. According to the method, the requirement for a fault network is looser, and the time delay of information transmission is considered, and the diagnosis precision is improved.
Description
technical field [0001] The invention relates to smart grid technology, in particular to a method for fault identification of transmission lines in a smart grid. Background technique [0002] Rapid detection of circuit transmission line interruption is an important part of power grid security status assessment. In the early work, scholars proposed a line fault detection method based on logical data (such as switch and circuit breaker status), within the scope of the data acquisition and monitoring system (SCADA), relevant data were obtained through manual observation and special sensors , infer the detection result through the artificial intelligence algorithm, and obtain the probability form of the connection of the line. However, due to the unreliability of the collected information and the lack of accurate representation of the network topology, the detection accuracy is not high. [0003] With the development of smart meter PMU (Phasor Measurement Unit) technology, it i...
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Login to View More IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06
Inventor 李睿刘力
Owner NANJING UNIV OF SCI & TECH