Power Control Device for Grid Frequency Stabilization
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Solution Overview
Problem
Electric power grids face frequency instability due to sudden changes in generation or load, which can lead to equipment failure or system collapse, and maintaining reserve capacity is costly and inefficient.
Innovation Solution
A power control device that adjusts load consumption based on AC supply frequency deviations, implementing a power compensation phase with a higher adjustment rate than the restoration phase to stabilize grid frequency without the need for external control inputs, and can be integrated with household appliances to manage power consumption continuously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reserve capacity is maintained in power generation units, then frequency stability is improved, but operational cost increases
Solution Approach 1:
Instead of maintaining reserve generation capacity to ensure frequency stability, the invention inverts the approach by controlling load consumption to match generation capacity. The power control device adjusts load power consumption based on frequency deviations, eliminating the need for expensive reserve generation capacity while maintaining frequency stability.
Solution Approach 2:
The power control device enables loads to self-regulate their power consumption based on frequency deviations. By autonomously adjusting power consumption without external control signals, the system eliminates the need for centralized reserve capacity management while maintaining grid frequency stability.
2Reliability
If speed governor response is used to compensate frequency variations, then frequency stability is improved, but response time is delayed
Solution Approach 1:
The invention replaces the mechanical speed governor system with an electronic power control device that directly adjusts load power consumption. This substitution eliminates mechanical response delays by using electronic detection of frequency deviations and immediate adjustment of power consumption through solid-state power electronics.
Solution Approach 2:
The power control device continuously monitors frequency and is ready to adjust load consumption immediately upon detecting deviations. By maintaining readiness to act and using fast electronic response mechanisms, the system eliminates the startup delay inherent in mechanical speed governors.
3Productivity
If load power is restored quickly after frequency stabilization, then operational efficiency is improved, but secondary frequency instability may occur
Solution Approach 1:
The power control device dynamically adjusts the rate of power restoration based on real-time frequency conditions. After frequency stabilization, the device gradually increases load power consumption at a controlled rate, allowing the system to adapt to changing conditions and avoid secondary instability while restoring operational efficiency.
Solution Approach 2:
The power control device continuously monitors frequency during the power restoration phase and adjusts the restoration rate based on feedback from frequency measurements. This closed-loop control prevents secondary frequency instability by detecting and responding to emerging frequency deviations during the restoration process.
Data Source
AI summary
A power control device for regulating the power that a load consumes on the basis of the AC supply frequency. The system includes decision logic that responds to a frequency deviation to implement a power regulation strategy. The power regulation strategy includes a power compensation phase during which the electrical power that the load consumes is adjusted (reduced or increased) to balance the load on the grid. The power regulation strategy also includes a power restoration phase during which the power to the load is restored (either increased or decreased). The rate at which the power is adjusted during the power compensation phase is higher than the rate at which the power is restored during the power restoration phase.