Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system
Reexamination Certificate
1998-04-29
2001-03-13
Stamber, Eric W. (Department: 2763)
Data processing: structural design, modeling, simulation, and em
Simulating electronic device or electrical system
C703S022000, C702S058000
Reexamination Certificate
active
06202041
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to electrical power network modelling methods for small perturbation stability in a power transmission network.
2. Description of Prior Art
Power system stability has been and continues to be a major concern in the system or network operation. Large and small disturbance are in two main categories for stability analysis. In the past, the small disturbance performance was evaluated by the result of a transient stability program under a small perturbation. However, this simulation result will provide a limited insight because of the difficulty in taking measurements and in ensuring sufficient stability margins for swing oscillations. The small disturbance analysis is increasingly recognized because the spontaneous nature of swing oscillations can be analyzed based on a linearized system at the steady-state operating point. An eigenvalue analysis of the system described in this application can provide many insights which are difficult to be observed in transient plots.
Many methods have been proposed to represent networks, machines and associated control equipment such as the excitation system (EXC), governor system (GOV) and power system stabilizer (PSS) as well as new components of FACTs (flexible alternating current transmission) under small perturbation. In power system, the network and components are described by equations, and the control equipments are usually represented by blocks. In all other existing techniques, the control blocks are eventually transformed into equations in order to integrate with the network/component equations to form the state space equations. However, they have the following weakness:
(i) limited flexibility,
(ii) difficulty to interface with any user's new devices,
(iii) restricted input/output signal selection, e.g. &Dgr;P
m
and &Dgr;V
ref
for input signals,
(iv) infinite busbar assumption or restriction to a small hypothetical system,
(v) difficulty for computer program implementation,
(vi) limited exploitation of eigenvector analysis.
SUMMARY OF THE INVENTION
According to the invention there is provided an electrical system network and component modelling method for small perturbation stability in a power system, the method comprising converting the system network into elementary transfer blocks, converting the components into elementary transfer blocks, and plugging the components into the network to form a state space model of the entire system.
The invention is distinguished from the existing techniques that, instead of converting block to equations, all equations (network and component) are converted to blocks, such that blocks of control equipment (to any degree of complexity) can be easily is amalgamated by assigning simple node numbers. Because the network equations is also converted to blocks, any block modules of components, for instance machines, static var compensator (SVC), phase shifter (PS), high voltage direct current (HVDC) system and control and tieline, can be plugged into the network module.
REFERENCES:
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patent: 5745368 (1998-04-01), Ejebe et al.
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Sanchez-Gasca, J.J.; Clark, K.; Miller, N.W.; Okamoto, H.; Kurita, A.; Chow, J.H.; “Identifying Linear Models from Time Domain Simulations”, IEEE Computer Applications in Power, vol. 10, Issue 2, pp. 26-30, Apr. 1997.
Ben-Tao Yuan; Dao-Zhi Xia; Yi-Xin Ni; “Eigen Analysis Method for Stability Evaluation of Linear Constant-coefficient RDDE and its Application to Power System”, Proceedings TENCON '93, IEEE Region 10 Conference on Computer, Communications, Control and Powe, Oct. 1993.
Chung Chi Yung
Tse Chi Tong
Hong Kong Polytechnic University
Jackson Walker L.L.P.
Sergent Douglas W.
Stamber Eric W.
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