Decoupled semi-linearization optimal power flow model based on warm start environment

Abstract

The invention discloses a decoupled semi-linearization optimal power flow model based on a warm start environment. The method includes: firstly, performing polynomial fitting on trigonometric functionterms in a power balance equation, and decoupling a voltage amplitude and a phase angle by employing operation characteristics of a system; then performing linearization processing on quadratic termsof the phase angle through the mode of Taylor series expansion; and finally obtaining the semi-linearization optimal power flow model with linear voltage phase angle and non-linear amplitude by regarding a result of a direct current optimal power flow model based on a power loss equivalent load as an operating point of Taylor series expansion of the quadratic terms of the phase angle. According to the semi-linearization optimal power flow model, the problem of dependence on the operating environment by warm start models is well solved, and the calculating precision of the linearization modeland the adaptability to a large system are improved.

Description

technical field [0001] The invention relates to a linearized optimal power flow model of a power system, which belongs to the technical field of power systems. Background technique [0002] Optimal power flow (OPF) calculation was first proposed by French scholar Carpentier in the 1960s, and it is an important means to ensure the safe and economical operation of power systems. However, the alternating current optimal power flow (ACOPF) model has strong nonlinear characteristics, and the coupling between its variables is very tight, which leads to low computational efficiency of the model and cannot meet the online requirements of large-scale systems. real-time computing needs. Therefore, it is particularly important to find a suitable linearized OPF model. Direct current optimal power flow (DCOPF) is currently the fastest linearized OPF model. However, since the model ignores the network loss and does not consider the influence of voltage amplitude and reactive power, its...

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Problems solved by technology

[0005] Purpose of the invention: The calculation efficiency of the AC optimal power flow model is difficult to meet the needs of large power grid operation analysis, the DCOPF model does not take into account the influence of voltage amplitude and reactive power, and it is impossible to obtain complete dispatch information and hot start linearization models Due to the high dependence on the operating point and the lack of methods to quickly provide a good operating environment, a semi-linear model is proposed that decouples the voltage amplitude and phase angle, and the voltage amplitude is nonlinear but the phase angle is linear.

For the phase angle operating point information required for the model to linearize the phase angle, the present invention rationally utilizes the existing high-precision DC optimal power flow model based on the network loss equivalent load, and uses the obtained results as the model described in the present invention. The required phase angle operating point, thus effectively solving the problem of high dependence of the hot start model on the operating environment, and expanding the scope of application of the model

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