Distributed Energy Resources Control for Islanded Grid Stability
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Solution Overview
Problem
Conventional technologies fail to effectively utilize distributed energy resources during large-scale natural disasters, as they are unable to maintain system operation and provide stable power supply when a section of the power system is separated, leading to insufficient synchronization and inefficient power management.
Innovation Solution
A distributed energy resources control apparatus comprising a detecting unit, a receiving unit, and a control unit that detects faults in the power system, receives authorization signals for independent operation, and controls power converters based on voltage and frequency measurements to ensure stable power supply to isolated system sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control methods are used to prevent islanding operation, then safety is improved, but power availability deteriorates during large-scale natural disasters
Solution Approach 1:
The control apparatus dynamically switches between different control modes (synchronization mode and independent operation mode) based on the power system state. When the power system is normal, the distributed energy resource operates in synchronization mode to maintain safety. When a fault is detected and authorization is received, it transitions to independent operation mode to provide power availability, thus resolving the contradiction between safety and power availability through dynamic adaptability.
2Productivity
If distributed energy resources operate independently in separated system sections, then power availability is improved, but system stability deteriorates due to insufficient synchronizing power
Solution Approach 1:
The control apparatus changes operational parameters (control mode) based on system conditions. When operating independently, it adjusts power converter control parameters to maintain voltage and frequency stability within the separated system section, compensating for insufficient synchronizing power by implementing appropriate control strategies for the independent operation state.
3Device complexity
If conventional control methods are used, then device complexity is reduced, but adaptability deteriorates when system configuration changes
Solution Approach 1:
The control apparatus is designed with multi-functionality to handle both synchronization operation and independent operation modes. It can adapt to different system configurations (connected or separated state) using a unified control structure that switches between operational modes, thereby achieving high adaptability without significantly increasing device complexity.
Data Source
AI summary
A distributed energy resources control apparatus for controlling power from a distributed energy resource in a system section separable from a power system includes a detecting unit, a receiving unit, and a control unit. The detecting unit detects a fault of the power system. The receiving unit receives a signal indicating authorization for the distributed energy resource to perform independent operation as linking with the system section, when the system section is separated from the power system. The control unit controls a power converter converting power from the distributed energy resource and outputting to the system section, based on measurement results of a voltage and a frequency of the system section, when the fault is detected and the signal is received.