Safety constraint optimization scheduling method for power grid (including 110kV level)

A power grid security and constrained optimization technology, applied in the electric power field, can solve problems such as small line reactance and resistance, deviation, inaccurate line power, etc., and achieve fast solution speed, high accuracy, and reasonable and accurate solution results

Active Publication Date: 2018-10-23
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology

[0004] For a power grid with 110kV level, since the ratio of line reactance to resistance in 110kV grid frame is relatively small, the simplified condition of X>>R is not satisfied. If the DC power flow model is directly used to calculate the line power for network security check, it will lead to The calculated line power is inaccurate, so there is a large deviation from the actual situation during the line power safety verification, which affects the optimal dispatching operation results of the power grid
[0005] At present, in the domestic and foreign safety-constrained optimal dispatching problems of power grids, the DC power flow model is usually used to calculate the line power directly for network security checks; and, for the safety-constrained optimal dispatching problems containing 110kV power grids (which do not satisfy the X>>R condition) What network analysis model should be used to accurately calculate the line power, no relevant research has been carried out

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  • Safety constraint optimization scheduling method for power grid (including 110kV level)
  • Safety constraint optimization scheduling method for power grid (including 110kV level)
  • Safety constraint optimization scheduling method for power grid (including 110kV level)

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[0023] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0024] This embodiment provides an optimal dispatching method with 110kV power grid security constraints, the method includes

[0025] (1) Establish an improved DC power flow model

[0026] Neglecting the grounding branch in the power grid, the active power of the line under the AC power flow model is:

[0027] P ij =V i V j (G ij cosθ ij +B ij sinθ ij )-V i 2 G ij (1)

[0028] In the formula: P ij is the active power of line ij; V i and V j are the voltage amplitudes of node i and node j respectively; θ ij is the voltage phase angle difference between node i and node j; G ij , B ij are the mutual conductance and mutual susceptance between node i and node j, respectively.

[0029] Simplify the process:

[0030] 1) Since the voltage amplitude of each node in the power system is close to the rated value under normal operating conditions,

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Abstract

The invention discloses a safety constraint optimization scheduling method for a power grid (including a 110kV level), and the method comprises the steps: improving a DC load flow model, wherein the line resistance cannot be neglected because the proportion of the line reactance in the 110kV-level power grid to the resistance is smaller and a simplification condition (X>>R) is not met; the voltageamplitude of each node is approximately close to a rated value, the difference of the phase angles of node voltages of two ends of a line is very small and approximately close to zero, and a grounding branch circuit in the power grid is neglected, so as to simplify an AC load flow model to obtain a line power calculation result with the higher accuracy; enabling an improved DC load flow model tobe applied to the security constraint daily power generation optimization scheduling of the power grid (including a 110kV level), wherein the solving speed is higher and the solving result is more reasonable and accurate.

Description

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Claims

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Application Information

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Owner SOUTH CHINA UNIV OF TECH
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