Double-feed blower fan synchronous motor system and method for inhibiting oscillation of synchronous generator

Abstract

The invention discloses a double-feed blower fan synchronous motor system and a method for inhibiting the oscillation of a synchronous generator. The method comprises the steps: detecting a power network voltage through a locked-phase loop, obtaining d-axis and q-axis component signals of the power network voltage, carrying out the processing of the d-axis and q-axis component signals through two different error amplifiers and a phase compensator unit, and obtaining two compensation signals; enabling the two compensation signals to respectively serve as the front feed for the current control of a rotor side converter of a wind power generator, and adding the two compensation signals to the instruction values of the d-axis and q-axis components of a rotor current, so as to respectively compensate for the d-axis and q-axis components of the rotor current. The method achieves the control of amplitude and phase of the internal potential of a double-feed blower fan through the compensation control of the rotor current, further affects the amplitude and phase of the internal potential of a synchronous motor through a power transmission line, and achieves the inhibition of the oscillation of the synchronous generator. Because the corresponding speed of a current loop is high and the d-axis and q-axis components of an electronic current can quickly track the instruction values, an oscillation signal can be extracted quickly when the synchronous generator generates oscillation, and the method quickly provides positive damping for the rotor of the synchronous motor through adding a stable signal.

Description

technical field [0001] The invention belongs to the field of new energy power generation, and more specifically relates to a doubly-fed fan synchronous machine system and a method for suppressing oscillation of a synchronous generator. Background technique [0002] Since 2010, China has become the world's largest energy producer and consumer. However, the unsatisfactory energy consumption structure has caused China to face severe energy problems at the same time. On the one hand, there are security risks in the supply of coal and oil in my country. From the perspective of energy supply, China's energy situation has become more fragile with the rapid growth of total demand and rising dependence on foreign countries. On the other hand, the massive consumption of coal and petroleum has caused serious environmental problems. my country has become the world's largest carbon emitter since 2008. The problem of smog in our country is mainly caused by the use of a large amount of ...

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Problems solved by technology

If a wind turbine is added to the system, it will cause changes in topology and power flow, which itself will cause a change in the damping of the synchronous generator; and if a synchronous generator with the same ca

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