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Linear optimal power flow algorithm of direct-current power grid

An optimal power flow, DC power grid technology, applied in the direction of DC network circuit devices, power transmission AC networks, AC networks with the same frequency from different sources, etc. method, the effect of speeding up computation, preserving computation accuracy, and optimizing performance

Pending Publication Date: 2022-05-20
TIANJIN UNIV
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Problems solved by technology

[0006] The present invention is proposed to solve the problem of complex solution algorithm and slow solution speed in the optimal power flow of the DC system due to the constraints of the nonlinear power flow equation in the prior art, and its purpose is to provide a linear optimal power flow algorithm for the DC power grid

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  • Linear optimal power flow algorithm of direct-current power grid
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Embodiment Construction

[0055] Below, the present invention is described in detail with reference to accompanying drawing and embodiment:

[0056] Such as Figure 1~3 As shown, a linear optimal power flow algorithm for a DC power grid includes the following steps:

[0057] ⅰ. Perform per-unit processing on the system

[0058] ii. List the objective function of the optimal power flow problem

[0059] ⅲ. Transform the nonlinear power flow equality constraints of the optimal power flow problem into linear power flow equality constraints

[0060] ⅳ. Form a simplified optimal power flow problem

[0061] ⅴ. Obtain the linear expression of DC voltage deviation

[0062] ⅵ. Deduce the power command value of each power controllable converter station to realize the regulation of the operation status of the DC system.

[0063] When step i processes the system per unit, the voltage base value is the rated DC voltage, and the power base value is the maximum converter capacity in the DC system.

[0064] Step ...

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Abstract

The invention discloses a linear optimal power flow algorithm of a direct-current power grid. The linear optimal power flow algorithm comprises the following steps: carrying out per-unit processing on a system; listing an objective function of the optimal power flow problem; converting a nonlinear power flow equality constraint of the optimal power flow problem into a linear power flow equality constraint; a simplified optimal power flow problem is formed; obtaining a linear expression of direct-current voltage deviation; deriving a power instruction value of each power-controllable converter station to realize regulation and control of the operation state of the direct current system; the power transmission system and the power transmission and distribution network thereof have a linear optimal power flow algorithm. According to the method, a direct-current power grid fast linear power flow algorithm is utilized, and nonlinear equality constraints in the optimal power flow problem are converted into linear equality constraints. Aiming at the optimal power flow problem taking direct current voltage deviation and converter power deviation as objective functions, a linear expression of an optimal power flow solution is obtained by utilizing Lagrange number multiplication.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a linear optimal power flow algorithm of a direct current power grid. Background technique [0002] Fully developing and utilizing renewable energy is an important way and way to achieve carbon peaking and carbon neutrality. Thanks to the advantages of the voltage source converter (Voltage source converter, VSC) to achieve decoupling control of active power and reactive power, and there is no problem such as commutation failure, DC transmission technology has developed rapidly. Compared with AC systems, DC systems mitigate the adverse effects of intermittency and volatility of renewable energy sources while improving power conversion efficiency. [0003] Therefore, the DC system is an effective solution for large-scale renewable energy grid integration and improving the penetration rate of new energy. [0004] While the multi-terminal direct curr...

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Application Information

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IPC IPC(8): G06F30/20H02J1/00H02J3/06H02J3/36G06F111/04G06F113/04
CPCG06F30/20H02J1/00H02J3/06H02J3/36G06F2111/04G06F2113/04Y02E60/60
Inventor 王一振
Owner TIANJIN UNIV