Wind-light-fire extra-high-voltage direct-current delivery scheduling method and system

Abstract

The invention relates to a wind-light-fire extra-high-voltage direct-current delivery scheduling method. The method comprises the following steps: determining a first weight coefficient of peak regulation time periods of equivalent new energy and a receiving-end power grid load, a second weight coefficient of a source load disturbance degree and a third weight coefficient of direct-current delivery new energy according to a fuzzy analytic hierarchy process; determining the minimum thermal power capacity; taking the lowest peak regulation degree of a receiving-end power grid as a target, and constructing a target function according to the peak regulation time period, the source load disturbance degree and the weight coefficient thereof; and constructing constraint conditions according to the minimum thermal power capacity, the thermal power generating unit output data, the new energy output data, the direct current channel output data and the total preset electric quantity of the directcurrent delivery day transaction, and finally obtaining an optimal solution of optimal scheduling. By optimizing the extra-high-voltage direct-current delivery power, the comprehensive use capacity of new energy can be improved, the reverse peak regulation time period and the source load disturbance degree of the receiving-end power grid are reduced, the wind curtailment and light curtailment amount is reduced, the peak regulation capacity of extra-high-voltage direct-current delivery wind, light and fire is improved, and the peak regulation margin of the receiving-end power grid is improved.

Description

technical field [0001] The invention relates to the field of UHV power transmission, in particular to a wind-light-fire UHV direct current dispatching method and system. Background technique [0002] In recent years, the development of my country's wind power and photovoltaic giant bases has been limited by the insufficient consumption capacity of the local power grid, and there is an urgent need to realize the cross-regional transmission of new energy power. Since the DC transmission line has no inductance, there is no stability problem, and the cost of the DC line is low, the control is fast and easy, and the energy loss is small, so the UHV DC transmission is used for large-capacity and long-distance transmission of new energy power. Such as figure 1 As shown, under the condition that the local power grid does not consume new energy, it needs to be equipped with thermal power units to stabilize its fluctuations, and then transmit it to the receiving power grid through UH...

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Problems solved by technology

[0005] However, the existing technology is limited by the characteristics of the traditional DC constant power operation mode (low power delivery at low load, high power delivery at high load), and cannot Flexible adjustment of the amount of power sent out by the DC channel makes the receiving end power grid have insufficient peak regulation margin, which in turn significantly increases the amount of curtailed wind and light

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