Flexible load controllable characteristic online modeling method based on micro-disturbance method

Abstract

The invention discloses a flexible load controllable characteristic online modeling method based on a micro-disturbance method. The method comprises the following steps of: step 1, acquiring prior data: acquiring transition process time and the highest working frequency of a load power voltage characteristic LTV process; step 2, designing an input signal: setting a pseudo-random binary signal as an input excitation signal; step 3, data processing: starting sampling after the non-stationary process of the signals is avoided, and preprocessing the sampled output signals; step 4, impulse responseidentification of the LTV process: identifying the LTV process of the load power voltage characteristics of the system by using a cross-correlation identification method to obtain an impulse responsefunction of the LTV process of the output load power voltage characteristics; and step 5, carrying out flexible load controllable characteristic modeling according to the impulse response function. The micro-disturbance ensures that the power regulation characteristic of the flexible load can be excited in real time without influencing the normal operation of the system; the static characteristics of the flexible load can be represented, and the dynamic characteristics of the flexible load can also be represented.

Description

technical field [0001] The invention relates to the technical field of distribution network load control, in particular to an online modeling method for flexible load controllable characteristics based on a micro-disturbance method. Background technique [0002] The adjustment of the traditional power grid is mainly concentrated on the power supply side and the grid side, which is reflected in the adjustment of unit output and the change of network operation mode. With the rapid development of distributed power, especially the large-scale installation of distributed new energy in the power grid, the operational flexibility of the power grid needs to be increased urgently. It is a challenging but meaningful task to explore the adjustment potential of the load side, especially the flexible load. matter. Load regulation is mainly implemented in the way of demand-side response in European and American countries where the power market is relatively mature. Demand-side response ...

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Problems solved by technology

Then, it can be seen from the formula (2) that the CVR factor only expresses the controllable characteristics of the flexible load from the steady-state characteristics, but cannot reflect the transient control characteristics of the flexible load

[0008] In order to model the controllable characteristics of flexible loads online, this patent designs an online modeling method for controllable characteristics of flexible loads based on the micro-perturbation method. This method uses both CVR factor and load power-voltage characteristics (Load-to- voltage, LTV) represents the controllable characteristics of the flexible load, and the relevant patents have not yet been reported

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