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Alternating current and direct current interconnected network automatic generation control method

A technology for automatic power generation control and interconnection of power grids, applied in electrical components, circuit devices, sustainable buildings, etc., to solve problems such as system instability, the inability of distributed control systems to achieve satisfactory control performance, and the inability to apply AGC system controller design. , to achieve high reliability

Pending Publication Date: 2018-07-13
STATE GRID GANSU ELECTRIC POWER CORP +2
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Problems solved by technology

In this control mode, when the coupling of each subsystem is relatively weak, the design of the controller is relatively simple; when the coupling between each subsystem is relatively strong, the distributed control system may not be able to achieve satisfactory control performance, and even the problem of system instability may occur.
Therefore, whether it is centralized model predictive control or decentralized model predictive control, there are certain defects, which cannot be applied to the AGC system controller design of the AC-DC interconnected grid with wind power.

Method used

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  • Alternating current and direct current interconnected network automatic generation control method
  • Alternating current and direct current interconnected network automatic generation control method
  • Alternating current and direct current interconnected network automatic generation control method

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Embodiment Construction

[0058] Embodiments of the present invention will be briefly described below with reference to the drawings.

[0059] as image 3 The shown two-area AC-DC interconnection grid AGC system containing multiple power supplies is an example of simulation research, and the specific implementation steps of the present invention can be summarized as follows:

[0060] 1) First transform the transfer function model of the AGC system into a state-space model and discretize it, and establish the corresponding state-space model of the discrete-time system;

[0061] 2) Related parameter settings of the upper and lower layers of MPC controllers:

[0062] Set the discrete point sampling period T s =0.1s, the prediction time domain p=20, the control time domain is m=10, the output weighting factor is 1, and the control weighting factor is 0.1.

[0063] 3) The wind power output deviation curve is given based on the short-term forecast value of wind power: Here, the embodiment of the present i...

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Abstract

The invention provides an alternating current and direct current interconnected network automatic generation control method based on two-stage layered model predictive control. According to the method, a decentralized control mode is adopted in the lower layer to realize model predictive control on multiple regional power grids; a dynamic coordinative mode is adopted in the upper layer to realizemonitoring on a decentralized model predictive controller on the lower layer, so that the method organically combines a centralized control mode and the decentralized control mode; and through a progressive relationship between the upper and lower layers, the control modes are switched, so that global optimality of the centralized control and expandability of the decentralized control mode are integrated.

Description

technical field [0001] The invention relates to the field of automatic power generation control of a power system, in particular to an automatic power generation control method for an AC / DC interconnected power grid based on a two-level layered model predictive control. Background technique [0002] Automatic Generation Control (AGC) is an important function in the energy management system EMS. It adjusts the output of generator sets in real time according to a certain adjustment rate to meet the requirements of power system frequency and tie line power control. As large-scale wind power is connected to the AC-DC interconnected grid, traditional AGC control methods are difficult to suppress the regional frequency stability and tie-line oscillations caused by wind power fluctuations. [0003] Model predictive control (Model Predictive Control, MPC) has been widely used in the field of power system control in recent years. Model predictive control is a kind of feedback contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00
CPCH02J13/0096Y02B90/20
Inventor 陈钊汪宁渤马彦宏丁坤赵龙周强马明王定美吕清泉张艳丽张健美王明松黄蓉张金平李津周识远张珍珍
Owner STATE GRID GANSU ELECTRIC POWER CORP
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