On-site voltage control method for smart distribution network based on synchrophasor measurement equivalent

Abstract

An in-situ voltage control method for smart distribution networks based on the equivalent value of synchronized phasor measurements: For a selected incompletely observable distribution system, input voltage control setting parameters and set voltage observation nodes; obtain each voltage observation The current voltage deviation of the node; arrange the observed nodes in order according to the voltage deviation from large to small; judge whether the voltage deviation of the node exceeds the limit value of voltage control, and the voltage measurement value is outside the control dead zone; judge whether the node has Obtain the historical measurement data of the synchronized phasor measuring device, estimate the parameters of the Thevenin equivalent model of the entire power distribution system except the nodes; according to the parameters of the Thevenin equivalent model, calculate the voltage change at the node and the power change at the node The voltage power sensitivity parameter of the relationship; determine the reactive power input amount at the node according to the voltage power sensitivity parameter. The invention effectively solves the problem of low accuracy of local voltage control and achieves the goal of voltage control.

Description

technical field [0001] The invention relates to a local voltage control method of a distribution network. In particular, it relates to an on-site voltage control method of an intelligent distribution network based on synchronized phasor measurement equivalents. Background technique [0002] With the extensive access of new energy and demand response resources, the randomness and volatility of the user side of the distribution system have been significantly enhanced, and higher requirements have been put forward for the monitoring and control level of the distribution network. The application of synchronized phasor measurement devices at the distribution network level can not only effectively improve the ability to perceive the operating status of the distribution network, but also provide a new idea for the parameter identification and operation control of the distribution system. With the access of new energy, the risk of voltage exceeding the limit in the distribution net...

AI Technical Summary

Problems solved by technology

[0004] Different from the power transmission system, the current level of the distribution network cannot meet the requirements of the system to be fully sizable, and it is difficult to obtain a complete and accurate real-time operating status of the entire system to achieve system sizable and meet the measurement requirements of centralized voltage control

At the same time, the existing model-based voltage control methods all rely on accurate line parameters. When the line parameters are wrong or cannot be obtained, the voltage control results will have large deviations.

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