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Robust estimation method based on synchronous phasor measurement for voltage power sensitivity of distribution network

A technology with robust sensitivity and voltage power, applied in computing, electrical components, circuit devices, etc., can solve problems such as robustness, affecting system state and parameter estimation effect, and measurement data containing bad data

Active Publication Date: 2018-01-12
南京首风智慧电力研究院有限公司
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Problems solved by technology

[0004] Although the synchrophasor measurement device can provide more accurate data measurement, due to the influence of data acquisition, conversion and communication, the measurement data may still contain bad data, which will greatly affect the system state and parameter estimation. effect, in this case, a more robust method is needed to estimate

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  • Robust estimation method based on synchronous phasor measurement for voltage power sensitivity of distribution network
  • Robust estimation method based on synchronous phasor measurement for voltage power sensitivity of distribution network
  • Robust estimation method based on synchronous phasor measurement for voltage power sensitivity of distribution network

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[0125] Firstly, input the IEEE 33 node example network topology connection relationship such as figure 2 As shown, node 1 is a balanced node, nodes 2 to 33 are PQ nodes, the reference capacity of the system is 1MVA, and the reference voltage is 12.66kV. The current power measurement of each PQ node is shown in Table 1. It can be seen from the topological connection relationship that the maximum degree of each node is 3, so the measurement data is required to be greater than 8 groups. In order to ensure the estimation accuracy, the number of measurement groups C=100 groups is selected here, and the random number of the power change and error of the simulation measurement The standard deviations of are set to 0.1 and 0.025%, respectively. The errors of the Jacobian matrix and the voltage power sensitivity matrix are calculated by formulas (13) and (14) respectively.

[0126]

[0127]

[0128] In the formula, K=2*(|Ω|-1) represents the dimension of the Jacobian matrix and...

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Abstract

Disclosed is a robust estimation method based on synchronous phasor measurement for voltage power sensitivity of a distribution network. The method comprises the steps of obtaining the network topology connection relationship, node type, system reference voltage and reference capacity of the distribution network; obtaining the maximum degree of nodes according to the topology connection relationship; obtaining the measurement values of the active power, reactive power, voltage amplitude and voltage phase angle of a synchronous phasor measurement device of each node of a system at the current moment and C groups of historical measurement data of the synchronous phasor measurement device; obtaining change values of C groups of power and voltage measurement; calculating a hat matrix, obtaining the hat value of each group of measurement, and determining the weight of each group of measurement; establishing a weighted least absolute value estimating model of a Jacobian matrix; converting the weighted least absolute value estimating model into a linear programming model; solving the linear programming model, and obtaining a robust estimation result of the Jacobian matrix; calculating theinversion of the Jacobian matrix, and obtaining an estimation result of voltage power sensitivity. By means of the method, the influence of an lever effect of bad voltage measurement data on the estimation precision is avoided, and the estimation precision of an algorithm is improved.

Description

technical field [0001] The invention relates to a method for estimating voltage power sensitivity of a distribution network. In particular, it relates to a method for robust estimation of distribution network voltage power sensitivity based on synchrophasor measurement. Background technique [0002] At present, various distributed power generation technologies aiming at the utilization of renewable energy are developing rapidly. While distributed power generation brings new vitality to the distribution network, it also makes the operation control of the distribution network face greater challenges. . Voltage power sensitivity plays an extremely important role in the operation and control of power systems because it can accurately reflect the relationship between voltage and power changes in the system. Especially with the development of advanced power equipment technology represented by synchrophasor measurement unit, the online estimation of voltage power sensitivity base...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 王成山宿洪智李鹏宋关羽
Owner 南京首风智慧电力研究院有限公司
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