Reactive power synergic control method and system of large-scale energy storage participating in new energy field station

Abstract

The invention discloses a reactive power synergic control method and system of a large-scale energy storage participating in new energy field station. According to the method, an energy storage converter is divided to active power synergic control group and a reactive power synergic control group, wherein the active power synergic control group is in a way that an active power is controlled with full capacity, smooth wind light output is performed and an active power target value of the full station is traced, and the reactive power synergic control group is in a way that a reactive power is controlled with full capacity, a reactive power voltage demand of a grid-connected point is traced, and reactive power standby of each reactive power source in the new energy field station is optimized. By the method, active power and reactive power decoupling control of large-scale energy storage under different control periods is achieved, the influence of active power and reactive power simultaneous control of an energy storage converter on stability and accuracy of active power control can be prevented, the smooth wind light output fluctuation of the energy storage is achieved, the influence of active power fluctuation on a voltage of the grid-connected point is reduced, the reactive power target control of the energy storage participating in tracing the voltage of the grid-connected point is also achieved, enough reactive power standby is reserved, and the grid-connected running stability of new energy power generation is improved.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a reactive power coordination control method and system for large-scale energy storage participating in new energy stations. Background technique [0002] The increasing shortage of traditional energy and the deteriorating environment have greatly promoted the development of new energy, and its power generation scale has also increased rapidly. New energy power generation based on wind energy and solar energy depends on natural resource conditions. Its output is volatile and intermittent, and its adjustment and control are difficult. Large-scale grid-connected operation will have a significant impact on the safe and stable operation of the grid. With the rapid development of energy storage technology, there are more and more types of energy storage devices, not only the capacity has become larger, but the production cost has also been reduced, which provi...

AI Technical Summary

Problems solved by technology

In the new energy station, the active power and reactive power control periods are different and are calculated and controlled independently of each other. The apparent power of a single PCS is rated, and the active power of each PCS is simultaneously adjusted in a short time scale (minute level). The reactive power and reactive power basically meet the active power target value and reactive power adjustment requirements of the whole new energy station, but the continuous adjustment of each PCS to adjust the reactive power in the long-term scale (hour level) will inevitably affect the control accuracy of active power. Reduce the effect of energy storage system to stabilize the power fluctuation of new energy

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