Active-disturbance-rejection DC supplementary damping control method for suppressing sub-synchronous oscillation

Abstract

The invention discloses an active-disturbance-rejection DC supplementary damping control method for suppressing sub-synchronous oscillation, which is characterized in that firstly a low-order transfer function under each sub-synchronous oscillation mode of the system is identified by using a TLS-ESPRIT algorithm in allusion to a problem that sub-synchronous oscillation of a thermal power plant may possibly be exacerbated by large-scale wind power access of a transmitting-end power grid, then a control objective of the controlled system is obtained by combining an ITAE index and a maximum and minimum principle, optimization is performed by adopting an improved genetic algorithm to determine parameters of a multi-channel active disturbance rejection controller (ADRC), and finally a wind power containing test system model is built on PSCAD / EMTDC. Simulation verification shows that the designed sub-synchronous supplementary damping controller can effectively suppress sub-synchronous oscillation of a steam-turbine generator set under various operating modes and fault conditions of the transmitting-end power grid, and has high robustness. In addition, the low-order ADRC also has a good control effect, and is suitable for practical applications of the engineering.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, in particular to an improved active disturbance rejection direct current additional damping control method for subsynchronous oscillation of a wind-fire bundling delivery system. Background technique [0002] As the scale of new energy development increases year by year, a large number of new energy represented by wind power is connected to the traditional power system dominated by thermal power, which brings new challenges to the research of subsynchronous oscillation (SSO). High voltage direct current (HVDC) may cause sub-synchronous torsional vibration of the turbo-generator unit, leading to fatigue accumulation or even fracture of the main shaft of the unit, which seriously threatens the stable operation of the power system (Li Xingyuan. High-voltage direct current transmission system [M] . Beijing: Science Press, 2010: 177-183.). After wind power is connected, the sub...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an ADDR DC additional damping control method for suppressing subsynchronous oscillations. Aiming at the problem that the large-scale wind power connection of the sending end grid may aggravate the subsynchronous oscillations of thermal power plants, the TLS- The ESPRIT (Total Least Squares Method for Harmonic Frequency Estimation) algorithm identifies the low-order transfer function in each synchronous oscillation mode of the system, and then combines the ITAE index (a performance index time multiplied by the integral of the absolute value of the error) and The control target of the controlled system is obtained by the principle of maximum and minimum values, and the parameters of the multi-channel ADRC are determined by the improved genetic algorithm, and finally the test system model including wind power is built on PSCAD / EMTDC

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