Virtual Power Plant Control for Grid Abnormality Response
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Solution Overview
Problem
Existing power management systems fail to effectively manage electric power exchange in response to various types of abnormalities in a power system, leading to potential re-occurrence of power failures and instability.
Innovation Solution
A power management device that includes a processor to manage power exchange through a virtual power plant, adjusting operations based on the cause of the abnormality, such as voltage or frequency issues, and prohibiting power exchange during disconnection or short-circuit failures until recovery, thereby enhancing system robustness and preventing re-occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the virtual power plant continues normal power exchange operations during abnormality, then productivity is maintained, but system reliability deteriorates due to potential re-occurrence of power failures
Solution Approach 1:
The power management device dynamically adjusts the operational mode of the virtual power plant based on real-time abnormality detection. When voltage or frequency abnormalities are detected, the system automatically transitions from normal bidirectional power exchange to restricted unidirectional power supply mode, and when severe abnormalities occur, it transitions to complete shutdown mode. This dynamic adaptation resolves the contradiction by maintaining productivity when safe and ensuring reliability when necessary.
Solution Approach 2:
The system changes operational parameters based on abnormality type: for voltage abnormalities, it restricts power flow direction; for frequency abnormalities, it limits output fluctuation within predetermined ranges; for severe failures, it prohibits power exchange entirely. These parameter changes allow the system to maintain acceptable productivity while preventing reliability deterioration under different abnormality conditions.
2Reliability
If the virtual power plant restricts power exchange during voltage abnormality to suppress power abnormality, then reliability is improved, but productivity decreases due to limited power exchange
Solution Approach 1:
During voltage abnormalities, the system applies partial action by allowing unidirectional power supply from the virtual power plant to the power system while prohibiting reverse power flow. This partial operational restriction maintains sufficient productivity to support critical loads while providing enough constraint to suppress power abnormalities and ensure system reliability.
3Reliability
If the virtual power plant limits output fluctuation during frequency abnormality, then reliability is improved, but productivity decreases due to reduced operational flexibility
Solution Approach 1:
During frequency abnormalities, the system changes the operational parameter by limiting output fluctuation within a predetermined value rather than completely shutting down. This allows the virtual power plant to maintain partial productivity and continue supporting the power system while the output limitation ensures frequency stability and prevents reliability deterioration.
4Reliability
If the virtual power plant prohibits power exchange during disconnection or short-circuit failure, then reliability is improved, but loss of time increases until failure recovery
Solution Approach 1:
The power management device implements preliminary anti-action by automatically detecting disconnection or short-circuit failures and immediately prohibiting power exchange to prevent catastrophic system damage. This preemptive shutdown protects system safety but necessarily causes temporary loss of productivity until the failure is recovered and normal operations can resume.
Data Source
AI summary
The power management device includes a processor that functions to manage power exchange in a power system including a virtual power plant, and the processor includes a processor that, when an abnormality occurs in the power system and a cause of the abnormality is a voltage abnormality, causes the virtual power plant to exchange electric power only in one direction for suppressing the power abnormality, and when the cause of the abnormality is a frequency abnormality, causes the virtual power plant to exchange electric power within a range in which the output variation is equal to or less than a predetermined value, and prohibits the exchange of electric power by the virtual power plant until recovery when the cause of the abnormality is a disconnection failure or a short-circuit failure.