Wind Farm Network Black Start Using Voltage-Forming Turbines
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Solution Overview
Problem
Energy generation networks, particularly wind farms, struggle to start up independently without assistance from the electrical supply network and support the electrical supply network during start-up, regeneration, or recovery from voltage dips.
Innovation Solution
A method for an energy generation network, such as a wind farm, involving a setup mode where voltage-forming devices provide network voltage and primary power supply devices synchronize and deliver current to initiate the network, utilizing static relationships between voltage and reactive power, and frequency and active power to manage independent start-up and support the electrical supply network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional power plant is used to provide base load power, then stable power supply is achieved, but high capital expenditure and long construction time are required
Solution Approach 1:
The power generation system is segmented into multiple independent fuel cell stacks that can be operated separately or in combination. Each stack functions as an independent power generation unit, allowing the system to be scaled and deployed in modular fashion rather than requiring a single large conventional power plant
Solution Approach 2:
The fuel cell system serves multiple functions: it generates electricity, produces heat for combined heat and power applications, and can operate on various fuel types including natural gas, biogas, and hydrogen. This multi-functionality replaces the need for separate conventional power and heat generation facilities
2Power
If fuel cell stacks are operated in parallel without current equalization, then system power output is increased, but current imbalance and efficiency loss occur
Solution Approach 1:
A control system continuously monitors the current output of each fuel cell stack and adjusts their operation accordingly. The controller receives feedback signals from current sensors and automatically equalizes current distribution by adjusting operating parameters of individual stacks to maintain optimal efficiency
Solution Approach 2:
The system dynamically adjusts the operating conditions of each fuel cell stack based on real-time performance data. Operating parameters such as fuel flow rate and air supply are continuously modified to maintain current balance and optimal efficiency as load conditions change
3Adaptability or versatility
If fuel cell stacks are frequently started and stopped to meet varying power demands, then power flexibility is improved, but degradation and reduced lifespan occur
Solution Approach 1:
The system performs preliminary warm-up of fuel cell stacks before full operation and gradual shutdown procedures before stopping. These preliminary actions prepare the stacks for operation or shutdown, reducing thermal shock and mechanical stress that would otherwise accelerate degradation during frequent start-stop cycles
4Speed
If reformate gas is used directly from reformers without buffering, then system responsiveness is improved, but composition fluctuations and instability occur
Solution Approach 1:
A buffer storage system is implemented to cushion fluctuations in reformate gas composition before it reaches the fuel cell stacks. The buffer acts as a stabilizing intermediate stage that smooths out composition variations while maintaining system responsiveness to load changes
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
Enables the energy generation network to start up independently and support the electrical supply network during voltage drops, ensuring stable operation and synchronization without external assistance.
Implementation Method 1
a plurality of fuel cell stacks (220, 220', 220''), each comprising a plurality of fuel cell units (202) connected in series parallel
Implementation Method 2
at least two reformers (210, 210') converting a hydrocarbon fuel into a reformate gas
Data Source
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AI summary
A method for starting an energy generation network, in particular a farm network of a wind farm, wherein the energy generation network is connected at least at one network connection point to an electrical supply network, and wherein the energy generation network, in a normal operating mode, exchanges electrical power with the electrical supply network via the network connection point, said method comprising the following steps: selecting a build-up mode different from the normal operating mode when the electrical supply network experiences a voltage drop and/or the power supply network is separated from the electrical supply network, and operating the energy generation network in the build-up mode, wherein in the build-up mode at least one voltage-impressing means, in particular a voltage-impressing wind power plant, provides an energy generation network voltage, in particular a wind farm network voltage, and at least one initial supply means, in particular a current-impressing wind power plant, synchronises with the energy generation network voltage provided by the voltage-impressing means, and the voltage-impressing means and the initial supply means in total provide an electrical power in the energy generation network at the level of an inherent need of the energy generation network.