Flow state evaluation method for power grid with UPFC based on standardized Euclidean distance

Abstract

The invention discloses a flow state evaluation method for a power grid with a UPFC based on standardized Euclidean distance. The flow state evaluation method is characterized by comprising the following steps that step one, a power grid flow optimization model considering the UPFC is established; step two, standardization processing is performed on load rate data of each line according to the optimal flow calculation result; step three, standardization processing is performed on the line load rate data under the working condition in view of a certain operation working condition to be evaluated; and step four, Euclidean distance between the working condition to the evaluated and the ideal optimal working condition is calculated, and the calculation result acts as the flow state evolution indicator under the working condition. An optimization objective is formulated from the two angles of line load balancing degree and line loss, the flow state evolution indicator is defined as the standardized Euclidean distance between the actual flow and the ideal flow, and finally different operation modes are evaluated according to the size of the indicator value.

Description

technical field [0001] The invention relates to a method for evaluating the power flow state of a power grid containing UPFC based on standardized Euclidean distance. Background technique [0002] A unified power flow controller (UPFC) is a typical flexible power transmission device, which can independently control the voltage, impedance and transmission angle of the transmission line by injecting series voltage, and can also selectively control the active and reactive power flow on the line , effectively improve the stability of the power system, has a wide range of application prospects. In practical engineering, it is often necessary to evaluate the different power flow states of the power grid containing UPFC and formulate a better UPFC control strategy. At present, most of the existing power flow evaluation methods start from the perspective of balanced line load rate, and judge the relative advantages and disadvantages of different operation modes according to the lin...

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Problems solved by technology

At present, most of the existing power flow evaluation methods start from the perspective of balanced line load rate, and judge the relative advantages and disadvantages of different operation modes according to the line load balance degree, which has the defect of single target, and cannot reflect the actual optimal power flow distance. degree of deviation from the trend

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