Power flow calculation method of uncertain power system

Abstract

The embodiment of the invention provides a power flow calculation method of an uncertain power system. The method comprises the steps of introducing reactive power constraints to a PV node and a balance node of the uncertain power system, and constructing a reactive out-of-limit hybrid power flow complementation constraint equation set of the uncertain power system by introducing a given nonlinearfunction based on the reactive power constraints; defining the active power, the node voltage and the uncertain network parameters of the uncertain power system as interval variables, and respectively representing the interval variables with bounded closed intervals; and solving the hybrid power flow complementation constraint equation set by adopting a given iterative algorithm based on the bounded closed intervals to obtain a voltage change interval of power flow calculation of the uncertain power system. According to the embodiment of the invention, the power flow calculation accuracy of the uncertain power system can be effectively improved, and the convergence is effectively improved.

Description

technical field [0001] The invention relates to the technical field of power flow calculation of a distribution network in a power system, and more particularly, relates to a power flow calculation method of an uncertain power system. Background technique [0002] There are many uncertainties in the operation of the power system, such as the intermittent output of new energy units (such as the increase and short-term changes of solar energy and wind power generation equipment), other factors such as weather and electricity prices, and the uncertainty of load and power system. Measurement errors of network parameters, etc. These uncertain factors will cause grid voltage fluctuations, sudden changes, and limit violations, which will affect the power flow calculation results of the power system and threaten the safe operation of the grid. [0003] At present, the power flow calculation methods considering system uncertainty are mainly divided into three categories: (1) stochas...

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Problems solved by technology

[0004] However, the calculation methods of the above categories (1) and (2) will always introduce a certain amount of probability error, which will affect the accuracy of the calculation results. The method of category (3) can solve the above problems to a certain extent, but its reactive power output It is controlled by the upper limit and the lower limit. When the reactive power output exceeds the limit, it can only be kept at its upper limit or lower limit, and the node voltage can no longer be kept at the set value, resulting in the transformation of the PV node into a PQ node at this time. , The balance node is changed to the Qθ node to re-calculate iteratively, there is still an accuracy problem, and it seriously affects the convergence

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