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Power distribution network voltage power sensitivity robust estimation method based on model equivalence

A technology with robust sensitivity, voltage and power, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficulty in ensuring the robustness of bad measurement data and deviation of estimated results.

Active Publication Date: 2019-04-16
TIANJIN UNIV
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Problems solved by technology

[0004] Although the synchronized phasor measurement device can realize the simultaneous measurement of voltage, current and other measurement amplitudes and phase angles, the obtained measurement data also has measurement noise and bad measurement data. The general least squares Or estimation methods such as Kalman filtering are difficult to guarantee the robustness of bad data measurement, resulting in large deviations in the estimation results when the measurement data contains bad data

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  • Power distribution network voltage power sensitivity robust estimation method based on model equivalence
  • Power distribution network voltage power sensitivity robust estimation method based on model equivalence
  • Power distribution network voltage power sensitivity robust estimation method based on model equivalence

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[0151] The method proposed by the present invention is verified by the IEEE 33 node calculation example, and the network topology connection relationship of the IEEE 33 node calculation example is as follows image 3 As shown, the reference capacity of the system is 1MVA, the reference voltage is 12.66kV, and the synchronized phasor measurement devices are connected to nodes 1, 6, 33, and 18. The simplified network topology is as follows Figure 4 shown.

[0152] Let D 0 =diag([0.00002 0.00002 0.000025 0.000025]), F=0

[0153] R=diag([0.000000986 0.000001]). In order to simulate the Gaussian noise in the synchronous measurement data, it is necessary to superimpose a Gaussian distribution with an expectation of 0 and a standard deviation of 0.001 on the voltage as a voltage measurement, and a Gaussian distribution with an expectation of 0 and a standard deviation of 0.001 on the current as a current measurement. At the same time, the injection power of all 33 nodes is fluctu...

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Abstract

The invention discloses a power distribution network voltage power sensitivity robust estimation method based on model equivalence. The power distribution network voltage power sensitivity robust estimation method based on the model equivalence comprises the steps that firstly, a power distribution network equivalent model is established; data is measured by using synchronous phasor, and equivalent model parameters are estimated by using a maximized correlation entropy kalman filter algorithm; a power distribution network is simplified according to the obtained equivalent model parameters; andby calculating a power flow jacobian matrix, and then the jacobian matrix is inverted to obtain the voltage power sensitivity. The equivalent network model can ensure the consistency of the voltage power sensitivity of each node before and after the equivalence, a proposed equivalent model parameter estimation algorithm can ensure the accuracy of the estimation under the condition that the measurement data contains noise and bad data, and the robust estimation calculation of the voltage power sensitivity is realized.

Description

technical field [0001] The invention relates to a voltage power sensitivity estimation method. In particular, it relates to a method for robust estimation of distribution network voltage power sensitivity based on model equivalents. Background technique [0002] Using synchrophasor measurement data to estimate and correct the model parameters of the power system can effectively solve the problems caused by the inability to obtain, inaccurate or incomplete information of the system model parameters on the simulation analysis and operation control of the power system, forming a completely based on Measurement methods for power system analysis. Similarly, voltage power sensitivity can accurately reflect the relationship between power system node voltage change and power change. System operation and management level. [0003] In order to realize the voltage power sensitivity estimation of the whole system, it is necessary to install a synchronized phasor measurement device at...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20Y02E60/00
Inventor 李鹏赵志达王成山宿洪智于浩宋关羽
Owner TIANJIN UNIV
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