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A method for calculating the maximum power supply capacity of 220kv urban power grid division

A technology with maximum power supply capacity and urban power grid, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as transient voltage stability can not be ignored

Active Publication Date: 2018-10-02
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In addition, for the receiving end grid, transient voltage stability is also a factor that cannot be ignored

Method used

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  • A method for calculating the maximum power supply capacity of 220kv urban power grid division
  • A method for calculating the maximum power supply capacity of 220kv urban power grid division
  • A method for calculating the maximum power supply capacity of 220kv urban power grid division

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Embodiment Construction

[0048] The present invention defines the TSC of the current 220kV urban grid partition as: the maximum load that the grid can carry under the conditions of transient voltage stability and static safety constraints after an N-1 fault for a certain output state of a power plant in the partition.

[0049] The whole technical solution is divided into the following 3 steps:

[0050] (1) Establish the TSC objective function of the regional power grid

[0051] Assuming that the TSC of the A partition is calculated, the objective function of the TSC is

[0052]

[0053] where TSC A Indicates the maximum power supply capacity of A partition; i∈A indicates that node i is a node of A partition; P Li is the active load of node i.

[0054] (2) Analysis of TSC calculation constraints

[0055] ①Constraints of power flow equation

[0056] Equality constraints are power flow equation constraints, expressed as follows

[0057]

[0058] Variable description in the formula:

[0059] P ...

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Abstract

The invention relates to a maximum power supply capability calculation method of a 220kV urban power grid district. The maximum power supply capability calculation method comprises the steps of (1) building a TSC (Total Supply Capability) target function of a district grid; (2) analyzing a TSC calculation constraint condition: 1, a power flow equation constraint; 2, a (N-1) static security constraint; and 3, a transient voltage stabilization constraint; and (3) simplifying and solving TSC by an approach method. On the basis of building a maximum power supply capability model of the 220kV district grid, a method for calculating a maximum available safety load of the 220kV urban power grid during actual running is given. By the method, the (N-1) static security and the transient voltage stability of the power grid are fully considered, and a calculation result is reasonable.

Description

technical field [0001] The invention provides a method for modeling and calculating the maximum power supply capacity of urban power grid subregions. Background technique [0002] The total supply capability (TSC) is an important index to evaluate the safety and economic operation of distribution network. [1-2] , which is defined as the maximum load supply capacity that can be borne under the N-1 safety criterion and various actual operating constraints in a certain power supply area [2-5] , the existing research is mainly on the medium voltage distribution network. [0003] At present, the TSC research of 220kV urban power grid mainly considers the maximum load that the power grid can carry under the static safety constraints of N-1 of each component in the zone within the adjustable range of generator output. The commonly used solution method is capacity-load ratio method [6] , the linear programming method [7-8] Optimal Power Flow Method [9-11] . However, when the d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 肖峻郭伟蒋迅李思岑刚发运伊丽达
Owner TIANJIN UNIV