Doubly-fed generator converter circuit integrated with energy storage unit and control method

Abstract

The invention discloses a doubly-fed generator converter circuit integrated with an energy storage unit and a control method, which belong to the technical field of doubly-fed wind generating set converter control, and solve the problem of how to design the doubly-fed generator converter circuit integrated with the energy storage unit to simultaneously consider energy storage equipment integrationand doubly-fed generator power grid adaptability improvement. Double functions of energy storage unit access and double-fed generator transient control capability improvement are simultaneously considered through the rotor auxiliary converter, unification of double-fed wind turbine generator power grid support and self power grid adaptability is realized, and direct integration of the energy storage unit is realized without a DC/DC converter, thus the cost and the manufacturing complexity of the converter system are reduced, and the operation efficiency of the converter system is improved; and the voltage required by a doubly-fed generator is provided by a rotor main converter and a rotor auxiliary converter together, and the voltage supply capability can be improved, so that the rotor side current of the doubly-fed generator can be better controlled, and the doubly-fed generator can be better controlled.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed wind power generating set conversion control, and in particular relates to a doubly-fed generator conversion circuit and a control method with an integrated energy storage unit. Background technique [0002] Doubly-fed generators are still the mainstream generators for megawatt-scale wind turbines. With the increase of the proportion of new energy power generation in the power grid, the stability of the power grid has become a hot issue in current research. In this context, the development of doubly-fed wind power generation is challenged in two aspects: on the one hand, grid stability urgently requires wind turbines to participate in frequency regulation to achieve active control of grid frequency; on the other hand, changes in grid voltage cause double The electromagnetic transients of the doubly-fed generator pose a challenge to the effectiveness of the rotor-side converter control of the do...

AI Technical Summary

Problems solved by technology

However, the converter circuit topology scheme of the integrated energy storage unit requires a high-power bidirectional DC / DC converter, which is difficult to manufacture and has low efficiency; its additional energy storage circuit does not provide benefits for the control of the doubly-fed generator itself; The voltage required for motor control is only provided by a single inverter of RSC, which has low reliability and poor grid transient adaptability

[0007] Through literature research, it is not difficult to find that the research on grid support and grid adaptability of doubly-fed wind turbines tends to add converter hardware equipment, but currently there is no scheme that also considers the integration of energy storage equipment The current research on the two aspects is relatively isolated, and there is a lack of optimized integrated topology for system considerations.

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