Control device for connecting isolated asymmetric load of induction generator

Abstract

The invention discloses a control device for connecting an isolated asymmetric load of a doubly-fed induction generator. The control device comprises a diesel engine, the doubly-fed induction generator, a position sensor, a diesel engine speed controller and a doubly-fed induction generator controller. The doubly-fed induction generator controller comprises a main control panel, a stator side converter power loop, a rotor side converter power loop, a stator side filter capacitor, a stator side filter reactor, a DC chain supporting capacitor, a DC side absorbing capacitor, an exciting DC power supply, a current sensor and a voltage sensor. The doubly-fed induction generator is enabled to effectively eliminate stator negative sequence and zero sequence voltage and maintain the frequency and the amplitude of stator voltage to be constant in connecting the isolated asymmetric load under different operation rotating speed, and the stator voltage can rapidly recover to be stable in case of sudden change of the load so that the control device has excellent performance of being suitable for the change of the load and is particularly suitable for the field of control of the doubly-fed induction generator of connecting the isolated asymmetric load.

Description

technical field [0001] The present application relates to the communication field, in particular to a control device for an induction generator connected to an isolated asymmetric load. Background technique [0002] Generators operating in isolation are widely used as mobile power sources in troops, construction sites, mountainous areas, rural areas, and forest farms. They are also used as backup emergency power sources in residences, shops, and hospitals. Isolation generally refers to loads that are not connected to the grid. At present, diesel engines are mainly used as The way that the prime mover drives the synchronous generator is realized. With the development of society, the original generator set running in isolation is heavy, high fuel consumption, loud noise, and serious exhaust pollution, which is no longer suitable for the needs of the society. In the future, the generator set should be in the direction of energy saving, environmental protection, light weight and...

AI Technical Summary

Problems solved by technology

[0003] The original isolated operating generator sets mainly use synchronous generators, and in order to ensure the constant output voltage frequency of synchronous generators, the generator speed can only be at the synchronous speed corresponding to the voltage frequency as the load changes. Lower operation, so that the diesel engine cannot operate in the high-efficiency zone, resulting in increased fuel consumption

[0004] Usually, the loads of such isolated generator sets are asymmetrical loads, such as single-phase loads (such as single-phase air conditioners, elevators, single-phase power supply equipment, etc.), and the generators are in an asymmetrical operating state, which cannot pass through when synchronous generators are used. To eliminate the asymmetry of the output voltage by means of control, the asymmetry of the output voltage can only be weakened by adding damping windings and other structural design methods, so the output voltage waveform will produce certain distortions, and when the load changes suddenly, synchronous power generation The motor excitation adjustment response is slow, and the output voltage amplitude will change significantly

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