Pseudo-Synchronous Power Supply Control for Grid Accident Step-Out Prevention
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Solution Overview
Problem
Pseudo-synchronous generators face a step-out condition when an accident in the power system causes a voltage drop, leading to a phase deviation between the power system and the generator's output voltage, which cannot be self-corrected.
Innovation Solution
A power supply device that simulates a synchronous generator, equipped with a processor and storage medium, includes a determination unit to detect accidents, a command frequency output unit to adjust frequencies based on target and actual powers, and a drive unit to generate output voltages, thereby preventing step-outs by maintaining frequency synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pseudo-synchronous generator controls output power by adjusting frequency based on power difference, then power control accuracy is improved, but during power system accidents the frequency deviation increases causing step-out
Solution Approach 1:
The control method dynamically switches between different control modes based on system conditions. During normal operation, frequency is adjusted based on power difference to maintain accuracy. During accidents, the system detects voltage drops and transitions to a mode that prioritizes frequency synchronization, preventing step-out while maintaining power control capability
Solution Approach 2:
The system continuously monitors both power output and voltage level, using feedback from these measurements to adjust control strategy. When voltage drop indicates an accident, the feedback mechanism triggers a control mode switch that maintains frequency synchronization, thereby preventing loss of synchronism while still responding to power control needs
2Productivity
If the generator maintains frequency synchronization during normal operation, then power control is effective, but during accidents the phase difference increases leading to step-out
Solution Approach 1:
The control system dynamically adapts its behavior based on operating conditions. During normal operation, it prioritizes power control by adjusting frequency based on power difference. During accidents detected by voltage monitoring, it dynamically switches to prioritize phase synchronization, maintaining frequency alignment with the grid to prevent step-out
Solution Approach 2:
The system takes preliminary action by continuously monitoring voltage levels to detect accidents before they cause step-out. When voltage drop is detected, the control method proactively switches to synchronization-priority mode, preventing the phase difference from reaching critical levels that would cause loss of synchronism
Data Source
AI summary
A power supply device, for simulating a synchronous generator and controlling a frequency of an output voltage, including: a determination unit configured to determine whether an accident occurs in a power system; a command frequency output unit configured to output a command frequency that reduces a difference between a first power that is a target to be provided to or received from the power system and a second power that is being provided to or received from the power system, when the power system is in a normal state, and output, irrespective of the difference, a predetermined command frequency, responsive to an occurrence of the accident; a generation unit configured to generate a control signal for controlling the output voltage, based on the command frequency; and a drive unit configured to output the output voltage generated based on the control signal, to the power system.