State variable analysis of dc-dc converters

Article Abstract:

In spacecraft power systems, different voltage and current levels must be available for different loads. In addition, the source for the spacecraft power system may generate low voltage and high current which must be converted to high voltage and low current for transmission to the loads. Therefore, dc-dc converters are an integral part of dc spacecraft power systems. The power requirements for future spacecraft power systems are such that dc-dc converters may need to be connected in series and parallel to supply the load. To simulate such converter systems, a modular dc-dc converter model is developed using state variable techniques. The state model for each converter in the system is solved using the state transition matrix method. A test system consisting of two boost converters connected in series supplying a resistive load is simulated and compared to a SPICE simulation. (Reprinted with permission of the publisher.)

Systems analysis, Aerospace engineering

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Simulation of transmission line transients with a distributed-parameter model using a personal computer

Article Abstract:

This paper presents a state space technique for the solution of electromagnetic traveling wave equations. By dividing the transmission line into a series of (pi)-section segments, a set of state equations is written in vector-matrix form. Each (pi)-section segment consists of a series resistance and inductance with a shunt conductance and capacitance place at the terminal ends of the segment. The state variables are chosen as the inductor currents and the capacitor voltages. The trapezoidal method of numerical integration is used to convert the state equations to a set of linear difference equations. Finally, LU factorization is used to update the difference equations. The state space technique presented is readily implemented on a personal computer. (Reprinted by permission of the publisher.)

Circuit design, Electromagnetic radiation, Microcomputer, Simulation, Transient State, Equation Analysis

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Simulation of power converter devices with nonlinear elements

Article Abstract:

This paper presents a technique for modeling and simulating power converters which contain nonlinear elements such as saturable inductors. Each nonlinear element is modeled by an ideal sampler, a variable gain, and a clamp. A state variable is added for each nonlinearity. A homogeneous state model is then formulated for the power converter. This state model is solved using a state transition matrix approach. A jump matrix J is utilized to account for the ideal sampler operations. (Reprinted by permission of the publisher.)

Electronics, Electrical engineering, Control systems, Nonlinear programming, Modeling, Data modeling software, Power supplies (Computers), Power Supply

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