Energy storage energy throughput implementation method in real-time compensation of wind power grid-connected forecast deviation

Abstract

The invention relates to the technical field of wind power generation system control, in particular to an energy storage energy throughput implementation method in real-time compensation of wind powergrid-connected forecast deviation. According to predicted power deviation positive and negative values and amplitudes, a bidirectional DC / DC converter (DC / DC) and a bidirectional DC / AC converter (DC / AC) are triggered to work in a specific mode through clock synchronization so as to compensate the wind power grid-connected forecast deviation. According to positive / negative of the deviation, the two converters alternately perform power and voltage control modes to cooperatively complete throughput of energy storage energy, compensate the wind power scheduling plan prediction deviation, reduce the prediction deviation and achieve effective plan tracking. By using the method of the invention, the prediction precision of the wind power integration plan is increased; the problem that a power grid cannot be scheduled due to large-proportion wind power access is solved, the scheduling reserve capacity of the power grid can be effectively reduced, the supply and demand balance of the power grid is maintained, the problem of unstable operation of the power grid is avoided, the wind power grid-connected operation capacity is effectively improved, and the problem of punishment electricity price caused by inaccurate prediction is overcome.

Description

technical field [0001] The invention relates to the technical field of wind power generation system control, in particular to a method for realizing energy storage energy throughput in real-time compensation of wind power grid-connected forecast deviation. Background technique [0002] The increasing maturity of wind power development technology has also promoted the continuous decline of investment costs, which is conducive to the bidding of wind power generation to the grid. In March 2019, the National Development and Reform Commission issued a document "Notice on Improving Wind Power Feed-in Tariff Policy", reaffirming the time plan for canceling new energy power generation subsidies, and clarifying that all onshore wind power operators will fully realize grid parity from 2021, which means that users can Equivalent consumption of the same amount of wind power and thermal power generation. The increasing willingness of people to consume green energy for wind power generat...

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Problems solved by technology

[0004] 1. The grid connection of wind power with obvious fluctuating characteristics is limited, resulting in a decline in the consumption of wind power generation, which accounts for a sluggish growth rate in the total power generation consumed by the grid, frequent abandonment of wind power and power rationing, resulting in waste of resources

[0005] 2. The low accuracy of the forecast leads to a soaring demand for grid-connected reserve capacity and doubles the operating cost of the grid

However, there are errors in the wind speed prediction itself, coupled with the systematic error of the prediction model, which leads to the low accuracy of the wind farm power prediction data, and the power grid dispatching management department cannot accurately arrange the power generation plan

The only reliable way for power grid companies to solve such problems is to allocate reasonable reserve capacity, but this objectively increases the operating cost of the power grid, and also affects the reasonable planning and scheduling of spinning reserve capacity by power dispatching departments

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