Hydrogen Buffering for Power Grid Oscillation Suppression
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Solution Overview
Problem
The method of removing grid-connected power generation units in turns to address oscillations in power systems reduces the system penetration rate and is not conducive to renewable energy integration, and frequent power interactions among converters and AC-DC hybrid power grids exacerbate oscillations.
Innovation Solution
An oscillation suppression system utilizing a hydrogen production and storage apparatus at the sending-end power generation unit and a power generation apparatus at the receiving-end power generation unit, activated to balance active power fluctuations, maintaining equal reductions and increases in power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grid-connected power generation units are removed in turns to address oscillations, then oscillation stability is improved, but system penetration rate decreases and renewable energy integration is hindered
Solution Approach 1:
The patent introduces a hydrogen production and storage apparatus as an intermediary component between the sending-end and receiving-end power generation units. This hydrogen buffer absorbs excess power when available and releases it during oscillations, mediating the power flow without requiring removal of renewable generation units, thus maintaining both stability and high penetration rates
Solution Approach 2:
The system dynamically changes the operational parameters of hydrogen production and storage apparatus based on real-time power system conditions. By adjusting hydrogen production rate and storage level according to power fluctuations, the system responds to oscillations without reducing renewable energy integration, resolving the contradiction between stability and penetration rate
2Adaptability or versatility
If renewable energy power generation units are connected through converters, then flexible integration is enabled, but frequent power interactions among converters and AC-DC hybrid power grid aggravate oscillations
Solution Approach 1:
The hydrogen production and storage apparatus serves as a physical intermediary that decouples the power interactions between converters and the AC-DC hybrid grid. By converting electrical energy to chemical energy (hydrogen) and back, it breaks the direct electrical coupling that causes harmful power interactions and oscillation aggravation
Solution Approach 2:
The patent replaces the direct electrical-mechanical coupling through converters with a chemical energy storage intermediary. This substitution transforms the interaction mechanism from direct electrical feedback loops to a slower chemical energy conversion process, eliminating the harmful high-frequency power interactions that aggravate oscillations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Suppresses oscillations without reducing system penetration rate, ensuring high integration of renewable energy and mitigating power interactions among converters and AC-DC hybrid power grids.
Implementation Method 1
hydrogen production and storage apparatus
Implementation Method 2
power generation apparatus
Data Source
AI summary
An oscillation suppression system and oscillation suppression method for an electric power system. The oscillation suppression system includes a hydrogen production and hydrogen storage apparatus mounted at a sending-end power generation unit in an electric power system and a power generation apparatus mounted at a receiving-end power generation unit in the electric power system, wherein power generation fuel of the power generation apparatus is from the hydrogen production and hydrogen storage apparatus; and when active power oscillation occurs in the electric power system, the hydrogen production and hydrogen storage apparatus and the power generation apparatus are put into operation, such that a decrease in active power, which is transmitted by the sending-end power generation unit, is kept equal to an increase in active power, which is transmitted by the receiving-end power generation unit. Therefore, there is no need to cut off grid-connected power generation units in turns when active power oscillation occurs in an electric power system, and oscillation suppression can be directly performed by means of a hydrogen production and hydrogen storage apparatus and a power generation apparatus, thereby maintaining high-permeability wind/light consumption.