# IEEE Transactions on Power Systems

## Filter Results

Displaying Results 1 - 25 of 61
• ### A PC-based simulation package for supporting end-user demand side energy management strategies

Publication Year: 1991, Page(s):897 - 903
Cited by:  Papers (7)
| | PDF (694 KB)

A simulation package designated at SIMCA-E/sup 2/ (simulation for management, control and analysis of electricity end-use) is described. The package covers a wide area of applications-namely, the testing and performance evaluation of demand controllers and demand control algorithms, computer-aided analysis of data from energy audits, generation of alternative scenarios according to different consu... View full abstract»

• ### Modified automatic time error control and inadvertent interchange reduction for the WSCC interconnected power systems

Publication Year: 1991, Page(s):904 - 913
Cited by:  Papers (7)
| | PDF (871 KB)

An automatic generation control (AGC) system is described that simultaneously reduces time error and accumulated inadvertent interchange energy in interconnected power systems. The Western Systems Coordinating Council (WSCC) adopted this control method in January, 1989 based on the results of the simulation studies described. Also described are accumulated inadvertent interchange reduction (AIIR) ... View full abstract»

• ### A fundamental study of inter-area oscillations in power systems

Publication Year: 1991, Page(s):914 - 921
Cited by:  Papers (554)  |  Patents (1)
| | PDF (690 KB)

A fundamental study of the nature of inter-area oscillations in power systems is presented. The effects of the system structure, generator modeling, excitation type, and system loads are discussed in detail. Both small signal and transient stability analyses are used to determine the characteristics of the system.<<ETX>> View full abstract»

• ### An efficient method of simulating stiffly connected power systems with stator and network transients included

Publication Year: 1991, Page(s):922 - 929
Cited by:  Papers (21)
| | PDF (880 KB)

A method is presented for simulating interconnected power systems with the stator and network transients included. This method is well suited for stiffly connected power systems in which tie-lines interconnecting the system components are electrically short (i.e. the tie-line charging capacitance can be neglected). The respective state-space models of the network and of the electric machines, comb... View full abstract»

• ### Generator resynchronization by a knowledge-based discrete controller

Publication Year: 1991, Page(s):930 - 936
| | PDF (508 KB)

An explanation is presented of the fundamental mechanism of the entire resynchronization control process and the sufficient conditions for the resynchronization of generators. Based on the knowledge of this mechanism, a discrete control scheme is deduced. Simulation studies and scaled model experiments show that reliable and fast automatic resynchronization is realized by this control scheme after... View full abstract»

• ### A new decomposition based method for optimal expansion planning of large transmission networks

Publication Year: 1991, Page(s):937 - 943
Cited by:  Papers (42)
| | PDF (799 KB)

A new method is presented for long-range transmission network expansion planning, based on the decomposition principle. The overall transmission expansion planning task is divided into two problems, the first one dealing with investments, and the second with operations. The investment problem is specified as the minimum cost problem of network programming, leading to the decomposition into the mod... View full abstract»

• ### A new methodology for determining transmission capacity margin in electric power systems

Publication Year: 1991, Page(s):944 - 951
Cited by:  Papers (13)  |  Patents (2)
| | PDF (901 KB)

The authors define transmission capacity margin, illustrate how the built-in margin method can cause simulation inaccuracy and how this inaccuracy can lead to erroneous analysis, and describe a new approach to implementing margin, referred to as the interpreted margin method, whereby simulation results are interpreted according to a margin criterion. This method requires accurate simulation models... View full abstract»

• ### Multi-year expansion planning for distribution systems

Publication Year: 1991, Page(s):952 - 958
Cited by:  Papers (55)
| | PDF (664 KB)

A multi-term distribution system expansion planning method is proposed. Many mathematical programming approaches have been proposed in this area. However, because of the complexity of the problem or the limitations of a computational time and memory size, these methods can only be applied to a small-scale system. To solve large-scale problems, the authors propose a new decomposition algorithm base... View full abstract»

• ### Tailoring induction motor analytical models to fit known motor performance characteristics and satisfy particular study needs

Publication Year: 1991, Page(s):959 - 965
Cited by:  Papers (42)
| | PDF (493 KB)

Induction motor equivalent circuit modeling is addressed. Data for induction motors are often not available in the form required by the equivalent circuit. An efficient method is therefore needed to find the resistances and reactances in the equivalent circuit from the data normally available. The method should be flexible enough to be applied both when complete current, torque, and power factor v... View full abstract»

• ### A study on voltage collapse mechanism in electric power systems

Publication Year: 1991, Page(s):966 - 974
Cited by:  Papers (49)
| | PDF (747 KB)

A mechanism of the dynamic phenomenon of voltage collapse is presented from the physical point of view. It is shown that an iterative reaction of voltage drop between a dynamic load and the system network can cause voltage collapse. The dynamic phenomenon of voltage collapse is analyzed on a simple power system model which includes a synchronous motor. Dynamic equations describing the mechanism of... View full abstract»

• ### Radial distribution test feeders

Publication Year: 1991, Page(s):975 - 985
Cited by:  Papers (273)  |  Patents (1)
| | PDF (668 KB)

In recent years many digital computer programs have been developed for the analysis of unbalanced three-phase radial distribution feeders. Because of the wide variation of the assumptions made in the development of the programs, there is a need for benchmark systems for comparison testing of the various programs. Complete data are presented for three four-wire wye and one three-wire delta radial d... View full abstract»

• ### Conservation voltage reduction (CVR) at Snohomish County PUD

Publication Year: 1991, Page(s):986 - 998
Cited by:  Papers (58)  |  Patents (10)
| | PDF (767 KB)

Results of field tests conducted on the Snohomish PUD's distribution system to measure changes in energy consumption resulting from service voltage reduction are presented. The economic evaluation of the effects of voltage reduction is also examined. In addition, recommendations on continued research and development in conservation voltage reduction (CVR) application are discussed. Field tests to ... View full abstract»

• ### Identification and updating of minimally dependent sets of measurements in state estimation

Publication Year: 1991, Page(s):999 - 1005
Cited by:  Papers (37)
| | PDF (689 KB)

A new algorithm for the identification and updating of minimally dependent sets of measurements is presented. The technique implemented in the algorithm is a mixed numerical-symbolic method based on a reduced model and graph theory. As a byproduct of the algorithm, critical measurements and error residual spread areas are provided. Emphasis is placed in the updating of the above quantities when on... View full abstract»

• ### Cost of transmission transactions: an introduction

Publication Year: 1991, Page(s):1006 - 1016
Cited by:  Papers (28)
| | PDF (1072 KB)

Major technical issues are discussed related to the cost of transmission transactions provided by a vertically integrated electric utility company. The authors identify the components of the cost of a transmission transaction and present methodologies for evaluating them using simple examples. The major cost components of a transmission transaction are: operating cost; opportunity cost; reinforcem... View full abstract»

• ### Unit commitment risk with sequential rescheduling

Publication Year: 1991, Page(s):1017 - 1023
Cited by:  Papers (9)
| | PDF (630 KB)

Rescheduling decisions in power system operation are often made to commit additional generating capacity to meet the system obligation of load plus spinning reserve. These are based on the observation of some events (e.g. unit forced outage) which lead to possible capacity deficiency. A new concept is presented of unit commitment risk analysis which explicitly models the stochastic sequence of eve... View full abstract»

• ### Operating problems with parallel flows

Publication Year: 1991, Page(s):1024 - 1034
Cited by:  Papers (13)
| | PDF (1144 KB)

A compilation of short notes that describe the ramifications of loop flows on the power systems of the Pennsylvania-New Jersey-Maryland interconnection, American Electric Power System, and the members of the Western Systems Coordinating Council. The operating problems caused by large loop flows are fairly well understood. The purpose of these short notes is to highlight the complexity of the probl... View full abstract»

• ### Power system feedback stabilizer design via optimal subeigenstructure assignment

Publication Year: 1991, Page(s):1035 - 1041
Cited by:  Papers (8)
| | PDF (510 KB)

Power system stabilizer (PSS) design is addressed using an optimal reduced order model whose state variables are torque angles and speeds. System damping can be improved by using eigenvalue assignment, and the coordination of stabilizers can be achieved through eigenvector assignment by maintaining system mode shapes. The proportional-integral PSSs are derived by the optimal reduced order model. T... View full abstract»

• ### Two-level optimal output feedback stabilizer design

Publication Year: 1991, Page(s):1042 - 1048
Cited by:  Papers (24)
| | PDF (436 KB)

Design of two-level system stabilizers is considered using an optimal reduced-order model whose state variables are torque angles and speeds. The reduced-order model retains their physical meaning and is used to design a two-level linear feedback controller that takes into account the realities and constraints of the electrical power systems. The two-level control strategy is used, and a global co... View full abstract»

• ### Dynamic security constrained multi-area unit commitment

Publication Year: 1991, Page(s):1049 - 1055
Cited by:  Papers (22)  |  Patents (1)
| | PDF (707 KB)

An approach is presented for multiarea unit commitment which takes the power system dynamic stability limit into account. Dynamic programming is employed to perform unit commitment on the whole system. The eigenvalues for the resultant hourly generation schedules are examined to see if they satisfy the prespecified dynamic security criterion. If the requirement is not met at certain hours, an iter... View full abstract»

• ### Dispatch of direct load control using dynamic programming

Publication Year: 1991, Page(s):1056 - 1061
Cited by:  Papers (107)
| | PDF (602 KB)

An approach based on dynamic programming is presented for the dispatch of direct load control (DLC). The objective is to coordinate DLC strategies with system unit commitment such that the system production cost is minimized. To achieve this goal, the DLC dispatch is first integrated into the unit commitment problem. An optimization technique based on dynamic programming is then developed to reach... View full abstract»

• ### Application of Prony analysis to the determination of modal content and equivalent models for measured power system response

Publication Year: 1991, Page(s):1062 - 1068
Cited by:  Papers (203)
| | PDF (576 KB)

It has been shown by J.F. Hauer et al. (ibid., vol.5, p.80-90, Feb. 1990) that Prony analysis can be very effective in response-based modal analysis of noise-free linear time-invariant (LTI) systems. This methodology extends Fourier analysis by directly estimating the frequency, damping, strength, and relative phase of the modal components present in a recorded signal. This earlier work is extende... View full abstract»

• ### A security-constrained decomposition approach to optimal reactive power planning

Publication Year: 1991, Page(s):1069 - 1076
Cited by:  Papers (47)
| | PDF (890 KB)

A two-level decomposition technique for VAr (voltampere reactive) sources planning in electric power systems is presented. Several operating conditions of the system (different base cases with associated contingencies) can be considered simultaneously. Total flexibility in the corrective or preventive treatment for control variables is provided. New VAr sources are modeled by discrete variables, a... View full abstract»

• ### An expert system for security trend analysis of a stability-limited power system

Publication Year: 1991, Page(s):1077 - 1084
Cited by:  Papers (14)
| | PDF (816 KB)

An expert system for dynamic security assessment (DSA) is described in which artificial intelligence techniques are applied to the transient energy function (TEF) method. The effect of contingencies on the security level and its rate of change with changing system conditions and parameters are computed using the results of the TEF sensitivity analysis program. The expert system determines the load... View full abstract»

• ### A concise method for calculating expected unserved energy in generating system reliability analysis

Publication Year: 1991, Page(s):1085 - 1091
Cited by:  Papers (17)
| | PDF (696 KB)

A simple and efficient technique is proposed for the calculation of expected unserved energy (EUE) in generating systems. The technique is new in that it uses a mean capacity outage table, which eliminates the need for construction of a negative margin table. This concept allows both LOLE (loss of load expectation) and EUE to be calculated with little more computational effort than is needed to ca... View full abstract»

• ### The engineering economics of power systems harmonics in subdistribution feeders: a preliminary study

Publication Year: 1991, Page(s):1092 - 1098
Cited by:  Papers (12)
| | PDF (505 KB)

A method for the computation of the cost of harmonic losses in a subdistribution feeder is presented. The cost of harmonics, including the cost of the filters, is compared with the cost of the 60 Hz power loss as well as the total annual cost of the system. Evaluating the cost of harmonic current $/A/year or the incremental cost of the harmonic reactive power,$/kVar/year, is recommended.<<E... View full abstract»

## Aims & Scope

Covers the requirements, planning, analysis, reliability, operation, and economics of electric generating, transmission, and distribution systems for general industrial, commercial, public, and domestic consumption.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
Nikos Hatziargyriou
National Technical University of Athens