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A load tracking method and system for an AC-DC interconnected power grid

A load tracking and interconnection grid technology, applied in AC network circuits, AC networks with energy trade/energy transmission authority, electrical components, etc., can solve problems affecting grid security and economy

Active Publication Date: 2018-02-23
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional energy-saving power generation dispatching technical support system is only optimized to the day-ahead dispatching plan in the plan formulation, and the modification of the intraday plan needs to rely on the dispatcher's dispatching experience. The lack of a scientific and intuitive decision-making system will definitely affect the security and economy of the power grid

Method used

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  • A load tracking method and system for an AC-DC interconnected power grid
  • A load tracking method and system for an AC-DC interconnected power grid
  • A load tracking method and system for an AC-DC interconnected power grid

Examples

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no. 1 example

[0093] like image 3 As shown, the load tracking method of the AC-DC interconnection grid proposed in this embodiment includes the following steps:

[0094] Step 1. Generate a power transfer factor table according to the current maintenance plan and the real-time whole network model.

[0095] Wherein, the line resistance is ignored when generating the power transfer factor table, and the power transfer factor table is constructed only according to the line reactance value.

[0096] Step 2. According to the unit parameters, determine the units participating in the load tracking method.

[0097] Among them, according to the adjustment capacity of each unit, unit type and other data, the units can be divided into three categories: (1) planned units, similar to traditional non-AGC units, generate power according to the preset plan, and the adjustment period is the adjustment of the upper-level dispatch plan Period; (2) load-following unit, that is, the unit involved in the load-...

no. 2 example

[0120] In this embodiment, the power alternate adjustment and distribution process is as follows: Figure 4 As shown, the following focuses on the introduction of the dynamic optimization model for reducing the power deficit in real time.

[0121] Takes a set of integer variables Z i ,i∈I, multiplying this variable with the adjustment step size as the adjustment amount of the unit, that is

[0122] ΔP i = Z i *A i ,i∈I

[0123] Among them, ΔP i Indicates the adjustment amount of unit i, A i Indicates the adjustment step of unit i.

[0124] The dynamic optimization model for reducing the power deficit in real time includes the following two aspects:

[0125] (1) Objective function

[0126] The present invention reduces the objective function of the dynamic optimization model of power shortage in real time as F=F 1 +F 2 , where F 1 and F 2 They are:

[0127] a. The operating cost F of each unit in the cycle time period 1 : When the total adjustment amount is fixed...

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Abstract

The invention discloses a load tracking method and system for an AC / DC interconnected network. The method comprises the steps as follows: a power transfer factor table is generated according to a current maintenance plan and a real-time entire network topology model; a set participating in load tracking is determined and basic data are input; power deviation is calculated according to the input basic data; alternate power adjusting distribution is carried out according to the power transfer factor table, input basic data and calculated power deviation; the alternate power adjusting distribution comprises, but is not limited to building a dynamic optimization model of cutting down power shortage in real time and solving the built dynamic optimization model by a branch-and-bound algorithm; a plan power flow is calculated according to the alternate power adjusting distribution result in a rolling manner and then whether section requirements are met or not is judged according to power flow section information; and a dispatching plan is released to a power network monitoring system according to the judgment result or alarm information is output. The load tracking method and system have the advantages of being scientific, intuitive, real-time and high in robustness, can be widely applied to the field of power dispatching.

Description

technical field [0001] The invention relates to the field of power dispatching, in particular to a load tracking method and system for an AC-DC interconnected power grid. Background technique [0002] In the actual operation of the power grid, uncertain changes in meteorological conditions and equipment status will cause large changes in power output power, network structure, and load demand. During the real-time dispatching process of the large power grid system with AC / DC hybrid operation, load forecast deviations of millions of kilowatts and inter-provincial plan adjustments often occur, which poses a huge challenge to the grid-province coordinated power generation plan adjustment and network security checks. [0003] The traditional energy-saving power generation dispatching technical support system is only optimized to the day-ahead dispatching plan in the plan formulation, and the modification of the intraday plan needs to rely on the dispatcher's dispatching experienc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/46
CPCH02J3/00H02J3/008H02J3/24H02J3/46H02J2203/20
Inventor 陈亦平莫维科侯君陈皓勇莫琦郑晓东孙雁斌何越黄丽颖
Owner CHINA SOUTHERN POWER GRID COMPANY
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