Boots – shoes – and leggings
Patent
1990-11-15
1994-01-11
Harvey, Jack B.
Boots, shoes, and leggings
364492, 364483, H02J 300, G06F 1520
Patent
active
052787788
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a simulator for simulating phenomenon of a system.
BACKGROUND ART
As an example of simulation in a simulator in the prior art, calculation of transient stability in an electric power system will be described based on a flow chart in FIG. 1. This is disclosed in the Transaction of the Institute of Electrical Engineers of Japan, May 1984, pp. 297-304, article 59-B36, "Calculation Method of High Speed Transient Stability Suitable for Array Processor".
In FIG. 1, reference numerals 41-51 designate respective steps in calculation of the transient stability. The calculation of the transient stability in an electric power system is in that system plan and working are carried out based on this, and two sets of equation, i.e., differential equation representing a generator and control system and algebraic equation representing relation of voltage and current in the power system, are solved in time sequence and alternately. Components to constitute the phenomenon of the power system include a generator, a generator bus connected to the generator, a non-generator bus being a load bus, excitation system constituted by an automatic voltage regulator, governor system constituted by a turbine, a power system stabilizer (hereinafter referred to as "PSS"), motion system and the like. Flow of the simulation is as shown in FIG. 1. That is, after the initial setting (step 41). calculation of the generator bus (step 42) and calculation of the non-generator bus (step 43) are carried out until attaining the convergence (step 44). If the convergence is the first time (step 45), calculation of each component is carried out in steps 47-51. After calculation of each component, process is returned to step 42. If the convergence is the second time or later, the convergence decision (step 46) is carried out and the simulation comes to the end in the case of the convergence.
Other simulation method is disclosed, for example, in "Denki Kyodo Kenkyu", Vol. 34, No. 5 (January 1979), p. 36.
As above described, simulation of phenomenon of the system in the prior art has been carried out in that each component is sequentially simulated by single processing unit.
Since the simulator in the prior art is constituted as above described, problems exist in that when the scale of the system and the number of components become large, enlargement or changing is difficult, and since the amount of processing becomes much, time to simulate the phenomenon of the system must be spent much.
DISCLOSURE OF INVENTION
In order to solve the above-mentioned problems in the prior art, an object of the invention is to provide a simulator wherein enlargement or changing of the system to be simulated can be carried out easily, and when the scale of the system and the number of the components become large, the number of processing units is increased, thereby the time required to simulate the phenomenon of the system can be prevented from increasing.
A decentralized simulator according to the invention is provided with a parallel processing computer having processing units arranged respectively to vertexes of the hypercube structure produced by increasing the vertexes recurrently as the number of dimensions increases and connecting the vertexes and having communication lines arranged respectively to sides of the hypercube structure, and the phenomenon of the system is divided into a plurality of components which are assigned to the processing units respectively, and the processing is carried out regarding the component to which each processing unit is assigned and the processing result is transferred by the communication lines thereby the phenomenon of the system is simulated.
In the simulator in the invention, a plurality of components are assigned and distributed respectively to the processing units and can be processed concurrently thereby the time required to simulate the phenomenon of the system can be reduced. Also if enlargement or changing of the scale of the system or the components is required, dimension
REFERENCES:
patent: 4766534 (1988-08-01), DeBenedictis
patent: 5032789 (1991-07-01), Firooz et al.
patent: 5050069 (1991-09-01), Hillis et al.
Taoka et al; "Real-Time Digital Simulator for Power System Analyis on a Hypercube Computer"; IEEE vol. 7, No. 1 Feb. 1992.
Akimoto et al.; "Distributed Power System Simulation on a Hypercube Computer"; IFAC Sep. 26, 1989.
Lee et al; "Parallel Power System Transient Stability Analysis on Hypercube Multiprocessors"; IEEE Trans. Power Aug. 1991.
Akimoto Yoshiakira
Ogi Hiromi
Sakaguchi Toshiaki
Tanaka Hideo
Taoka Hisao
Harvey Jack B.
Mitsubishi Denki & Kabushiki Kaisha
Ramirez Ellis B.
The Tokyo Electric Power Co. Inc.
LandOfFree
Decentralized simulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Decentralized simulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decentralized simulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1635735