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Generator control device

A generator control and generator technology, applied in circuit devices, control generators, control systems, etc., can solve the problems of inability to adjust generators with high accuracy, frequency deviation, processing time, etc.

Inactive Publication Date: 2004-02-25
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a situation arises where the necessary generator output cannot be adjusted with high accuracy
[0012] Furthermore, regarding the limitation of fuel consumption, the operation of calculating the fuel consumption once the generator output is determined and correcting the fuel cost correction coefficient to make it match the fuel consumption target is repeated. output, so there is a problem of processing time
[0013] In addition, the power generation is controlled by predicting the power demand in advance, but if it deviates from the predicted value, there will be a limit to the speed at which the generator can increase or decrease the output, so timely control cannot be performed.
When the actual total demand of the day deviates from the total demand forecast value, there will be unfavorable conditions that do not meet the supply and demand balance limit, or produce frequency deviations
[0014] Furthermore, since the frequency deviation is not directly dealt with, in the EDC control, the frequency cannot be adjusted when paralleling (incorporating) and decoupling (disconnecting) generators, especially pumped water generators (pumped storage generators). Condition maintained at specified value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] Figure 1 is an example of the configuration of the central power supply command station, which consists of a generator control device 10, a data setting device 20, a line operation plan adjustment device 30, a system monitoring device 40, a control signal transmission device 50 and an AFC The control unit 60 is configured. The generator control device 10 outputs, for example, a signal instructing EDC control every 5 minutes in order to optimize the power generation cost. The AFC control unit 60 outputs a signal instructing AFC control every five seconds, for example, based on the frequency deviation ΔF of the power system detected by the system monitoring device 40 .

[0028]The output of the generator control device 10 and the AFC control unit 60 is transmitted to each generator (not shown) as a command value through the control signal transmission device 50, and each generator operates according to the command value. In addition, since the present invention is essent...

Embodiment approach 2

[0044] In some cases, information on the increase or decrease in the power demand (load) can be obtained in advance from a large number of power consumers such as ironworks. In the second embodiment, the amount of power generation is controlled more accurately using this information and the variable speed flywheel.

[0045] The generator output optimization unit 5 according to Embodiment 2 includes a load behavior prediction device 11 as shown in FIG. 14 . The load behavior prediction device 11 can know in advance the increase or decrease of the power demand based on the load behavior information obtained from a large number of demanders or the like. Alternatively, by analyzing the pattern of the frequency deviation ΔF output from the system monitoring device 40 by the load operation pattern detection unit 12 , it is also possible to predict the increase or decrease in the power demand.

[0046] A variable speed flywheel is a device that stores electricity as rotational energ...

Embodiment approach 3

[0056]There is a follow-up delay in frequency control. In Embodiments 1 and 2, since the problem of frequency deviation ΔF is not directly dealt with by EDC control, even if AFC control is executed at a cycle of 5 seconds to maintain frequency stability, the frequency will deviate considerably from the specified value (50 Hz or 60 Hz) Case. This deviation is particularly likely to occur when the following two signals are sent from the central power supply command station to each power station. A control signal for the output of the generator.

[0057] In Embodiment 3, the result of EDC control every 5 minutes is used as the initial value, and the follow-up delay and change speed of each generator are considered for the initial value, and the frequency deviation is minimized by further optimization . The restriction here is the frequency deviation restriction shown in FIG. 17 . The frequency deviation ΔF[tj] is calculated from Pi[tj] determined in consideration of the follo...

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Abstract

A power generator controller includes a power system monitor and a power generator output optimizing part. The power system monitor keeps check on current status of a power system and puts out an electricity demand. The power generator output optimizing part solves an objective function for determining outputs of power generators of the power system at an interval under a supply and demand balancing constraint which imposes agreement between electric power demanded and electric power supplied. The objective function minimizes total costs in power generation. The power generator output optimizing part solves the objective function further considering an automatic frequency control capacity constraint based on an upper limit of rates of change of outputs of power generators of the power system.

Description

technical field [0001] The present invention relates to a generator control device, and more particularly, to a generator control device for commanding the amount of power generation of each generator from a remote location. Background technique [0002] The power stations include hydroelectric power stations, thermal power stations, and nuclear power stations. Electricity generated in these power stations reaches users via transmission lines, but electricity cannot be stored, so it is necessary to adjust the amount of power generated by each power station according to the amount of electricity used. The central power supply command station monitors the electricity consumption that changes every moment, and instructs the power generation amount to each power station. The central power supply command station increases or decreases the power supply according to the power demand, and adjusts the power generation of the generator so that there is no excess or shortage between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/24H02J3/38H02J3/46
CPCY04S10/545Y02E40/76H02J3/24G06Q50/06Y02E40/70Y04S10/50H02J3/241H02J3/38
Inventor 小岛康弘中村静香森一美泉井良夫
Owner MITSUBISHI ELECTRIC CORP
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