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システム/制御/情報 Vol. 11 (1998), No. 4

ISIJ International
belloff
オンライン版ISSN: 2185-811X
冊子版ISSN: 1342-5668
発行機関: THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE)

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  34. Vol. 4 (1991)

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  35. Vol. 3 (1990)

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キーワードランキング

23 Nov. (Last 30 Days)

システム/制御/情報 Vol. 11 (1998), No. 4

多重ループ型セルフチューニングPID制御系の一設計

山本 透, Sirish L. SHAH

pp. 163-171

DOI:

10.5687/iscie.11.163

抄録

In this paper, a new multiloop self-tuning PID controller design scheme is proposed. The proposed control scheme has a static matrix pre-compensator in order to reduce the interaction terms of the process transfer function matrix. The static matrix pre-compensator is adjusted by an on-line estimator. The p×p pre-compensated system is then controlled via 'p' self-tuning PID controllers, whose parameters are adjusted by a second identifier placed around the pre-compensated plant. The PID parameters are calculated on-line based on the relationship between the PID control and generalized minimum variance control laws. The proposed scheme is experimentally evaluated on a 2×2 temperature plus level control system. Experimental results illustrate the effectiveness of the new scheme.

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多重ループ型セルフチューニングPID制御系の一設計

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入出力特性を補間する線形離散時間システムのパラメトリゼーション

堀口 和己

pp. 172-181

DOI:

10.5687/iscie.11.172

抄録

Problems of finding linear systems which are consistent with given input-output characteristics are important in system approximation, model reduction and system identification. A conventional problem among them is the partial realization problem. In this paper, we consider a problem of finding MIMO linear discrete-time systems interpolating given input-output characteristics. The input-output characteristics are given by coefficients of the Taylor series of the transfer function at some complex points in the unit circle. Thus our problem is a generalization of the partial realization problem. Here, we provide a parametrization of all the interpolating systems with a norm constraint and a parametrization of all the stable interpolating systems.

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入出力特性を補間する線形離散時間システムのパラメトリゼーション

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拡張H∞制御を用いた多地域電力システムの周波数制御

美多 勉, 劉 康志, Kang-Zhi LIU

pp. 182-189

DOI:

10.5687/iscie.11.182

抄録

In this study, the extended H∞, control, proposed in Ref. 6), is applied to the frequency control of a multi area power generation plant. More specifically, we consider a two area electric power generation system, with two generators, two loads and a tie-line connecting them. The purpose is to reject the frequency deviations due to step load disturbance.
This is an interesting control problem because of the existence of a zero at s=0 in the multivariable plant that imposes a constraint on the steady state output y (∞). The paper discusses how to construct a suitable generalized plant for such a problem in order to design an H∞ optimized control system that is able to reject step load disturbances asymptotically.
Using the H∞ approach, the controller is derived to achieve the disturbance rejection and to be robust to parameter uncertainty of the plant. The performances of the extended H∞ controller and the LQG controller are compared. It is shown that the H∞ controller is superior to the LQG controller in both nominal case and perturbed case.

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拡張H∞制御を用いた多地域電力システムの周波数制御

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入力集合の可分離性からみた両極型ネットの収束上の優位性

白土 浩, 五反田 博, 井上 勝裕, 熊丸 耕介

pp. 190-197

DOI:

10.5687/iscie.11.190

抄録

In this paper, the separability condition that the separation hyperplanes pass through rectangles surrounding the input sets is formulated by normal vectors. Then distributions of the normal vectors satisfying the condition are depicted for the two-dimensional case. These distributions elucidate that the condition for the first hidden layer varies significantly even when the input patterns are simply translated, and that the conditions (in a wider sense) for the other layers are different depending on whether the unit is unipolar or bipolar, i.e. whether it activates from 0 to 1 or from-0.5 to 0.5. The initial distributions of the normal vectors with the weights initialized ordinarily by random numbers with zero mean are also depicted. Comparison of the initial distributions to the separability conditions leads to the conclusion that the bipolar nets are superior to the unipolar nets in convergence of the back propagation learning initialized in such an ordinary manner. The bipolar nets exhibit better convergence than the unipolar nets even if their input space divisions in every layer by the separation hyperplanes are geometrically the same at the outset of the learning.

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入力集合の可分離性からみた両極型ネットの収束上の優位性

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発見的自己組織化の原理に基づいてネットワーク構造を自己組織化するGMDHtypeニューラルネットワークアルゴリズム

近藤 正

pp. 198-207

DOI:

10.5687/iscie.11.198

抄録

A GMDH type neural network algorithm which can identify a nonlinear system whose structure is very complex is proposed. In this algorithm, the heuristic self-organization method of the GMDH algorithm is used and so a neural network structure which has a good prediction accuracy can be organized automatically. Furthermore, instead of the partial polynomials which are used in the GMDH algorithm, partial-neural networks which have four layered hierarchical network structures are used to construct the GMDH type neural network. The proposed algorithm is applied to a nonlinear system identification problem and its advantage over the GMDH algorithm and the conventional networks is shown.

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発見的自己組織化の原理に基づいてネットワーク構造を自己組織化するGMDHtypeニューラルネットワークアルゴリズム

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電子制御式巻線機の高速高精度軌道追従制御

羅 正華, 船木 陸議, 宮脇 伸郎, Noburo MIYAWAKI

pp. 208-215

DOI:

10.5687/iscie.11.208

抄録

In this paper, we propose a new algorithm for on-line adaptive identification of dynamics of general motor servo systems including winding machines. This algorithm is then incorporated into a feedforward controller to realize the high speed tracking control for a prototype of winding machines. The parameter convergence as well as the stability of the closed-loop tracking system is proved theoretically, and simulations and experiments are conducted to study the feasibility of the adaptive indentification algorithm and the control performance of the feedback loop. It is found that the algorithm not only guarantees the parameter convergence, but also yields satisfactory transient responses of the identified parameters. This enables us to use the simple feedforward controller to realize high speed tracking control of servo systems.

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電子制御式巻線機の高速高精度軌道追従制御

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変位フィードバックによる大型宇宙構造物のロバスト安定化

藤崎 泰正, 池田 雅夫, 三木 和博

pp. 219-221

DOI:

10.5687/iscie.11.219
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変位フィードバックによる大型宇宙構造物のロバスト安定化

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