Wind-electricity integration power stabilizer based on active type voltage source DC power transmission

Abstract

The invention discloses a power stabilizer of integrated wind power that is based on active voltage source direct current power transmission and belongs to the technical field of power network power stabilizer. The invention is a device that is used for stabilizing the power of integrated wind power and is based on active voltage source direct current power transmission, and the stabilizer comprises a rectifier, an inverter, an energy storage device, a DC bus and a controller. In steady-state operation, the voltage source direct current power transmission transmits wind power to power networks, and at the same time compensates the dynamic fluctuation of the wind power through the energy storage device that is connected in parallel on the voltage source DC bus, so that the power of the wind power that is input into the power networks through the voltage source direct current power transmission is stable. When the power networks are in fault, the active power and the reactive power that are input into the power networks are adjusted, and the steady operation performance of the power networks is enhanced. The device solves the problem that the dynamic fluctuation of wind power is influenced by input power networks, improves greatly the stabilization of integrated wind power and bears great significance in the energetic development of wind power generation.

Description

technical field [0001] The invention belongs to the technical field of grid power stabilization, in particular to a wind power grid-connected power stabilizer based on active voltage source DC transmission. Background technique [0002] Energy is the material basis for the existence and development of human society, and the increasingly serious energy shortage and environmental degradation are global issues involving human survival and development; renewable energy is a clean energy that can be recycled and is the hope of the future energy system; Renewable energy resources are very rich, and it is not subject to geographical restrictions, can be used locally, and has great development potential and application prospects; as the most mature wind energy among renewable energy technologies, it has moved towards large-scale and industrialization, and wind power is in the The proportion in the power grid is increasing; because wind power is an intermittent energy source, the out...

AI Technical Summary

Problems solved by technology

[0005] At present, the voltage source DC transmission researched at home and abroad has no energy storage device on the DC bus, which we call passive type; if we connect the energy storage device on the DC bus, we call it the voltage source of the DC bus and the energy storage device. DC transmission is an active voltage source DC transmission, and its converter station control technology usually uses a combination of DC voltage and reactive power (or AC voltage) control at one end, and active power and reactive power (or AC voltage) control at the other end. In combination, because its active and reactive power control is completely decoupled, its control performance is superior, and it has been widely used in foreign wind farm grid-connected connections; the voltage source DC transmission technology currently researched is mainly used for power transmission, and has not solved the problem. The impact of wind energy fluctuations in wind farms on the power grid; because wind power fluctuations pose a certain threat to the power quality and safe and stable operation of grid-connected grids, it will restrict the further development of wind farm scale;

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