Method and device for identifying feasible region of robust output of virtual power plant considering uncertainty

Abstract

The invention discloses a method and device for identifying a feasible region of robust output of a virtual power plant considering uncertainty, wherein the method includes: the active power distribution network containing distributed power generation and flexible loads is equivalent to an active power sum A virtual power plant with adjustable reactive power; construct a feasible region for safe operation of virtual power plants that takes into account renewable energy output and power load uncertainty; project the feasible region for safe operation of virtual power plants into a feasible region for robust output of virtual power plants through constraint aggregation; The vertices of the feasible domain of robust output of the virtual power plant are identified by the algorithm of vertex enumeration and column constraint generation, and then the set of linear inequalities describing the feasible domain is obtained. This method realizes the embedded consideration of uncertainty factors in the identification of the feasible region of output of virtual power plants, which can ensure the feasible region of output of virtual power plants that can operate safely under any uncertainty disturbance, and is conducive to promoting the efficient utilization of distributed power generation resources , Conducive to ensuring the safe and reliable operation of power systems containing distributed power sources.

Description

technical field [0001] The invention relates to the technical field of electric power system dispatching operation, in particular to a method and device for identifying a feasible region of robust output of a virtual power plant in consideration of uncertainty. Background technique [0002] With the continuous development of the economy, the power load of cities, towns, and industrial parks has grown rapidly. Distributed photovoltaics, wind power, energy storage, small cogeneration units, biomass power generation and other distributed power sources are connected to the distribution network in large quantities due to their advantages of high efficiency, economy and environmental protection. The continuous access of distributed power can not only supply local loads, but also send power through the distribution network when new energy generation increases and local loads are low, providing support for loads in other areas of the transmission network. At the same time, distribu...

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Problems solved by technology

However, the output of intermittent distributed power sources such as distributed photovoltaics and distributed wind power has significant uncertainty and volatility, and the active and reactive loads in the distribution network also have uncertainties.

If the feasible region of virtual power plant output is calculated only based on the point prediction results, the dispatching results may not be executed for the virtual power plant due to the fluctuation of distributed power generation output and the error of load forecasting, which will cause power shortage of distribution network, over-limit of distribution network voltage, Safety issues such as distribution network power flow exceeding the limit

[0004] Existing literature and technologies are still unable to consider the uncertainty of distributed power output and power load in the calculation of the feasible region of virtual power plant output, and cannot ensure that virtual power plants can operate safely and reliably under any uncertainty fluctuations

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