Generator Output Power Stabilization via Impedance Compensation
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Solution Overview
Problem
Electrical generators with non-resistive source impedance are sensitive to variations in load impedance, particularly when connected to nonlinear loads, leading to instability in output power due to interdependent changes in generator output and load impedance.
Innovation Solution
A method and apparatus that include a compensation subsystem with an impedance-measurement circuit and a compensation-signal-generation circuit to provide a compensation signal to the generator, rendering the transfer function of output power with respect to the main control signal insensitive to load impedance variations, thereby stabilizing the output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the generator uses a non-resistive source impedance design, then the generator is less expensive and bulky, but the generator becomes much more sensitive to variations in load impedance
Solution Approach 1:
The patent implements a feedback control system that measures the load impedance and adjusts the generator's output impedance dynamically to maintain stability. The control system continuously monitors the interaction between generator and load, and modifies operating parameters to compensate for impedance variations, resolving the contradiction between using simple non-resistive impedance design and maintaining reliability.
Solution Approach 2:
The patent changes the operating parameters of the generator dynamically based on detected load conditions. By adjusting frequency, power level, or other controllable parameters in response to load impedance variations, the system maintains stable operation while keeping the simple non-resistive source impedance design, thus achieving both cost-effectiveness and reliability.
2Productivity
If the generator output power changes, then the load impedance changes for nonlinear loads, but this can result in instability of the generator output power
Solution Approach 1:
The patent employs a feedback control mechanism that detects changes in load impedance resulting from power adjustments and responds by modifying generator operating parameters to maintain stable output. This closed-loop control prevents the instability that would otherwise result from the interdependent changes between power output and load impedance in nonlinear loads.
Solution Approach 2:
The control system performs preliminary adjustments to generator parameters before full power delivery to anticipate and prevent instability. By pre-adjusting operating conditions based on detected load characteristics, the system avoids the problematic feedback loop between power changes and impedance variations that causes instability.
Data Source
AI summary
A method and apparatus for modifying interactions between an electrical generator and a nonlinear load is described. One illustrative embodiment receives a main control signal at a control input of an engine of the electrical generator, the main control signal controlling at least one of output power, output current, and output voltage delivered by the electrical generator to the nonlinear load, the engine being one of a power amplifier and a converter; measures the impedance of the nonlinear load; and feeds to the electrical generator a compensation signal corresponding to the measured impedance, the compensation signal rendering a transfer function of the output power of the electrical generator with respect to the main control signal substantially insensitive to variations in the impedance of the nonlinear load to stabilize the output power of the electrical generator.