Novel linearization power flow calculation method

A power flow calculation and linearization technology, applied in AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., it can solve the problems of poor accuracy and poor applicability of DC power flow models, and achieve high computational efficiency.

Inactive Publication Date: 2017-08-18
HOHAI UNIV
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[0005] Purpose of the invention: The technical problem to be solved by the present invention is aimed at the situation that the

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Embodiment Construction

[0047] Power flow calculation is the most basic electrical calculation in the field of power system planning and operation. The traditional power flow calculation problem is solved by the AC power flow model, which is a nonlinear model consisting of a set of nonlinear equations, which can completely reflect the actual problem and has high calculation accuracy. Its traditional node power balance equation is

[0048]

[0049] Where: P Gi ,P Di is the active power supply and active load of node i; Q Gi , Q Di is the reactive power supply and reactive load of node i; V i is the voltage amplitude of node i; G ij , B ij is the i-th row and j-th column element of the node admittance matrix; θ ij = θ i -θ j is the phase angle difference at both ends of the line; N is the number of nodes in the system.

[0050] Since the above power flow equation is a nonlinear equation, it needs to be solved iteratively until the result converges, and finally solve the line power flow acc...

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Abstract

The invention discloses a novel linearization power flow calculation method. Direct current power flow is the most widely-applied power flow calculation linearization method at current, which has high solving speed and without causing a convergence problem; however, the method has low calculation precision, and two important electrical variables which refer to a node voltage and circuit reactive power cannot be solved, so that the application range of the method is limited. On the basis, the invention provides a novel linearization power flow calculation model with higher precision; by virtue of the model, the calculation efficiency can be ensured while the circuit reactive power can be solved at the same time; an example simulation result proves that the novel linearization power flow calculation method maintains high efficiency of the conventional direct current power flow, has higher precision and higher applicability, and can solve the circuit reactive power.

Description

technical field [0001] The invention relates to a novel linearized power flow calculation method, which belongs to the field of power system analysis and calculation. Background technique [0002] Power flow calculation is the most basic electrical calculation in the field of power system planning and operation. The traditional power flow calculation problem is solved by the AC power flow model, which is a nonlinear model consisting of a set of nonlinear equations, which can completely reflect the actual problem and has high calculation accuracy. However, with the continuous development of the power system, the scale of the power grid is getting larger and the operating conditions are becoming more and more complex. Due to its complex nonlinearity, the AC power flow model has low solution efficiency and may even fail to converge. When encountering some occasions that require relatively high calculation speed, the AC model cannot meet the requirements of calculation efficien...

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Application Information

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IPC IPC(8): H02J3/06H02J3/18
CPCY02E40/30H02J3/06H02J3/1821
Inventor 卫志农张清松孙国强臧海祥何天雨
Owner HOHAI UNIV
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