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Multi-section-based power flow control method

A power flow control and multi-section technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of unsatisfactory processing of discrete control variables, waste of computing resources, and lack of

Active Publication Date: 2014-08-27
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: there are certain restrictions on the objective function and constraints, such as continuous, differentiable, etc.; in many cases, it will fall into a local minimum solution or it is difficult to converge when it is close to the optimal solution; the processing of discrete control variables is not ideal
All methods based on network splitting will waste computing resources when the grid size is not too large
[0009] To sum up, there is currently a lack of an effective power flow algorithm to control the power of multiple sections to the target value, and a set of power flow that makes the power of each section meet the given target is of great significance to the analysis of the power grid

Method used

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Experimental program
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Embodiment Construction

[0079] Experiments were conducted on the WEPRI-36 node system. System wiring such as figure 2 As shown in Table 1, the initial power and type of each generator are shown in Table 1, and the initial voltage amplitude and phase angle are shown in Table 2. In the following description, the number of the bus bar where the generator is located is used as the generator number, the unit of the phase angle is degree, the system power reference is 10MVA, and other data are in units of standard units. For convenience, the upper limit of active power of each machine is 8, the lower limit is -0.01, the upper limit of reactive power is 6, and the lower limit is 0; the adjustable output with weight of each machine is taken as (9) and (11), and the weights are 1.

[0080] Table 1: Generator initial power and type

[0081] Generator bus name

BUS1

BUS 2

BUS 3

BUS 4

BUS 5

BUS 6

BUS 7

BUS 8

Initial merit

6.2271

6.0000

3.1000 ...

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Abstract

The invention provides a multi-section-based power flow control method, which comprises the following steps of: (1) inputting raw data, and initializing voltage; (2) forming an admittance matrix; (3) setting initial values ei<(0)>, fi<(0)>, Ui<(0)>, and thetai<(0)> of voltage of each point; (4) substituting the initial value of the voltage of each point into an unbalance formula of injection power and a node voltage square to calculate an amount of unbalance; (5) forming a jacobi matrix, and calculating each element; (6) solving a correction equation; and (7) obtaining a variation from a required point solution section power to a target generator power value. The multi-section-based power flow control method is high in calculation accuracy and applicable to a large-scale power grid, the calculation time of an intelligent optimization algorithm is shortened, and calculation resources are saved; and moreover, convergence measures can be ensured when section power is greatly varied.

Description

technical field [0001] The invention belongs to the field of electric power system simulation and calculation analysis, and specifically relates to a method based on multi-section power flow control. Background technique [0002] Stream computing has always been a concern of power systems. An accurate network power flow calculation result can reflect the overall situation of the power grid at a moment. This not only leaves a good calculation basis for future transient calculations and small disturbance calculations, but also reflects the stability margin of the power grid under disturbance conditions. With the trend of large power grid interconnection, the power system will become larger and more complex in the foreseeable future, and the increase in the scale of the power grid will also lead to the severity of power grid accidents. Most of these accidents are caused by untimely early warning and monitoring. At present, the construction of the smart grid also puts forward...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46G06F19/00
Inventor 邱健吴淘丁平王天琪陆俊刘宇星牛玲玲
Owner CHINA ELECTRIC POWER RES INST