Offshore Plant Black Start Using Battery Energy Storage
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Solution Overview
Problem
Existing offshore power plants face limitations in energy supply during blackouts, as diesel generators provide insufficient energy and cannot restore the initial power conditions post-blackout.
Innovation Solution
A battery energy storage system is integrated with a switching and detecting device to inject energy to the power generation sources, including gas turbines, to restore energy conditions and compensate grid fluctuations, using inverters, filters, and transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diesel generators are used as auxiliary energy sources to power the load during a blackout, then the offshore plant can maintain limited power supply, but the energy supplied is insufficient to restore the initial power conditions of the offshore plant
Solution Approach 1:
The battery energy storage system is charged in advance during normal operation when the power grid is available. This preliminary energy storage enables the system to provide sufficient power during blackouts, resolving the contradiction by preparing energy beforehand rather than relying on limited diesel generator capacity during the emergency.
Solution Approach 2:
The battery energy storage system acts as an intermediary between the power grid and the load. During blackouts, it provides the missing energy bridge that diesel generators cannot supply, enabling full power restoration while maintaining reliability. The battery system mediates the energy gap between limited diesel generation and full plant power requirements.
2Ease of operation
If diesel generators operate as power backup during a blackout, then the offshore plant can reactivate gas turbines, but the diesel generators cannot recreate the power conditions of the offshore plant prior to the power failure
Solution Approach 1:
The battery energy storage system stores sufficient energy in advance to provide the high power needed for gas turbine reactivation and full plant power restoration. This preliminary energy preparation eliminates the limitation of diesel generators, enabling both easy operation and complete power condition recreation during blackout recovery.
3Reliability
If the battery energy storage system injects energy to the power generation source to start it up, then the initial energy conditions can be restored, but the system complexity increases with additional components
Solution Approach 1:
The battery energy storage system performs multiple functions: it compensates for grid fluctuations during normal operation, provides black start capability during blackouts, and enables gas turbine reactivation. This multi-functionality justifies the added complexity by consolidating multiple energy management tasks into a single versatile system rather than requiring separate dedicated systems for each function.
Solution Approach 2:
The battery energy storage system serves as a versatile intermediary that mediates between the power grid, power generation sources, and load under various operating conditions. It provides black start capability, fluctuation compensation, and startup energy injection through a single integrated system, managing complexity through unified energy mediation rather than multiple specialized systems.
4Stability of the object's composition
If the battery energy storage system compensates for grid fluctuations through charge/discharge processes, then the power grid stability is improved, but the detection and control requirements increase
Solution Approach 1:
The switching and detecting device continuously monitors grid fluctuations and provides feedback to control the battery energy storage system's charge/discharge operations. This feedback mechanism automatically adjusts battery output to counteract detected fluctuations, improving grid stability while managing detection complexity through automated closed-loop control rather than manual monitoring.
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
The method effectively restores initial energy conditions and compensates power grid fluctuations, ensuring stable operation post-blackout.
Implementation Method 1
a battery energy storage system connected to the power grid and to the load... injecting by the battery energy storage system, the energy to the power generation source
Implementation Method 2
the battery energy storage system comprises a plurality of inverters for converting an input direct current into an output alternating current
Implementation Method 3
a plurality of transformers... for converting voltage levels to match between the battery system and the power grid
Implementation Method 4
a plurality of filters for reducing disturbances on the supply line
Data Source
AI summary
A method for performing a start-up of an offshore plant. The offshore plant comprises a power grid, wherein the power grid comprises a power generation source for generating the energy, a load driven by the power generation source and connected to the power grid, a battery energy storage system connected to the power grid and to the load, and a switching and detecting device connected to the power grid. The method comprises the steps of: detecting by the switching and detecting device, a power outage between the load and power grid; and injecting by the battery energy storage system, the energy to the power generation source to start it up, so as to restore the energy conditions on the power grid prior to the power outage. The injecting step provides the re-energization of a busbar connected to the battery energy storage system and a generator connected to a gas turbine.