Energy Packet Voltage Control for Non-Sinusoidal Power Systems
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Solution Overview
Problem
Existing electric power systems face challenges in accurately measuring and controlling energy transfer due to the introduction of non-sinusoidal waveforms and power-electronically coupled devices, which lead to errors in voltage control and stability assessment, especially with the increasing dynamics and renewables.
Innovation Solution
The concept of energy packets is introduced, allowing for precise measurement and communication of energy exchanges at fixed rates, independent of system frequency and phase angles, using intelligent electronic devices (IEDs) that calculate and utilize energy packets for voltage control and stability assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional voltage control algorithms use complex power as input, then voltage control can be performed, but measurement precision deteriorates due to errors introduced by non-sinusoidal waveforms and power-electronically coupled devices
Solution Approach 1:
The patent changes the fundamental parameter used for voltage control from complex power (which assumes sinusoidal steady-state) to energy packets calculated directly from instantaneous voltage and current measurements. This parameter change allows accurate measurement under non-sinusoidal conditions by avoiding the assumptions inherent in complex power calculations.
Solution Approach 2:
The patent replaces the traditional complex power calculation methodology with a direct energy packet measurement approach. Instead of using derived complex power parameters that require sinusoidal assumptions, the system directly measures and communicates energy packets calculated from instantaneous measurements, substituting the computational approach with a direct measurement approach.
2Adaptability or versatility
If power-electronically coupled devices and renewables are added to increase system adaptability, then system versatility improves, but measurement precision deteriorates due to non-sinusoidal waveforms and dynamics
Solution Approach 1:
The patent changes the measurement parameter from complex power (frequency and phase-dependent) to energy packets (time-domain based). This allows the system to accurately measure energy transfer from renewables and power-electronic devices that produce non-sinusoidal waveforms, as energy packets are calculated directly from instantaneous measurements without assuming sinusoidal steady-state conditions.
3Ease of operation
If traditional complex power methods are used for simplicity, then ease of operation is maintained, but reliability deteriorates under dynamic conditions with renewables
Solution Approach 1:
The patent replaces the complex power calculation system with an energy packet measurement system. While complex power methods are simple under sinusoidal steady-state, they fail under dynamic conditions. The energy packet approach maintains operational simplicity through direct measurement and communication at fixed rates, while significantly improving reliability under dynamic and non-sinusoidal conditions.
Data Source
AI summary
Electric power system voltage control and voltage stability may be calculated using energy packets. Sets of negative energy packet sets normalized by a set of positive and negative energy packet sets may be used for voltage control by adding or removing capacitive units. Energy packet voltage indicators may be calculated using energy packets, and used to determine voltage stability. Control actions may be taken depending on the determined voltage stability.