Automatic generation control-based control method for flexible direct-current transmission to recover power grid

Abstract

The invention discloses an automatic generation control-based control method for flexible direct-current transmission to recover a power grid. The method includes the following steps that: 1) the mathematical model of the current converter of a voltage source type flexible direct-current power transmission system in a synchronous coordinate system is established; 2) the control system of the rectifier and inverter of the voltage source type flexible direct-current power transmission system in power grid recovery is established according to a double-closed-loop control principle; 3) an automatic generation control system and a generator speed governor model capable of receiving control signals are established according to a generated output control requirement of the participation of the voltage source type flexible direct-current power transmission system in the power grid recovery; and 4) based on the above model establishment, a control strategy for performing the power grid recoveryby means of the cooperation of the voltage source type flexible direct-current power transmission system and the automatic generation control is provided, so that the power grid system can be recovered. With the control method of the invention adopted, the stability of the power grid system can be maintained, the limitation of the inherent load recovery speed of the system in a black start process can be broken, and the load recovery ratio of the system can be increased once.

Description

Technical field [0001] The invention belongs to the field of smart grids, and in particular relates to a control method of flexible direct current transmission based on automatic power generation control for power grid restoration. Background technique [0002] In recent years, the frequent occurrence of various climatic disasters and the large-scale integration of multiple new energy sources into the power grid have placed extremely high requirements on the safe and stable operation of the power grid. If the partial failure of the sub-network occurs due to incorrect actions of the protection or automatic device, it will cause a large-scale blackout of the power grid. How to ensure that the power system quickly resumes normal operation after a blackout is a problem that has received more attention and urgently needs to be resolved. [0003] The black start can be used to recover from a black start. The so-called black start means that after the entire system is powered off due to ...

AI Technical Summary

Problems solved by technology

At present, the theoretical research on flexible DC transmission has been basically realized in China, but there are relatively few simulation studies on using the voltage source flexible DC transmission system as the black start power supply of the power grid and completing the entire start-up process of the system from a blackout to normal operation.

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