Wind Turbine and Energy Storage Black Start Coordination Control
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Solution Overview
Problem
The lack of a coordinated black start control method for multiple distributed energy storage systems and wind turbine generator sets, particularly those with permanent-magnet direct-drive type, hinders efficient system recovery post-blackout, leading to increased recovery costs and inefficiencies due to the reliance on traditional methods like hydropower or gas sets.
Innovation Solution
A black start control method involving power reduction through pitch angle adjustment, transformation of voltage and current into d-axis and q-axis forms, and coordinated control using droop and voltage outer loop controllers to manage active and reactive power, ensuring consistent frequency and voltage across distributed systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional black start methods using hydropower or gas sets are employed, then system recovery can be achieved, but recovery cost increases and efficiency decreases due to reliance on centralized power sources
Solution Approach 1:
The patent divides the black start function into multiple distributed units (energy storage systems and wind turbines) rather than relying on a single centralized source. Each unit independently provides voltage support and power injection, enabling parallel recovery operations that increase overall efficiency while maintaining reliability through redundancy
Solution Approach 2:
The patent combines energy storage systems and wind turbines into a coordinated black start framework. The energy storage provides immediate voltage support while wind turbines contribute active power, creating a hybrid distributed black start capability that reduces recovery time and costs compared to traditional single-source methods
2Productivity
If distributed energy storage systems are used for black start, then system recovery efficiency improves, but coordination control among multiple distributed units becomes complex
Solution Approach 1:
Each distributed energy storage unit and wind turbine operates with autonomous control capabilities, making local decisions based on its own state and simple communication signals from neighbors. This decentralized self-service approach eliminates the need for complex centralized coordination while maintaining efficient cooperative black start operation
Solution Approach 2:
The patent implements feedback mechanisms where each distributed unit monitors its own operating parameters (voltage, frequency, power output) and adjusts its control strategy accordingly. This local feedback loop simplifies coordination by enabling autonomous adaptation without requiring complex inter-unit communication and control algorithms
3Use of energy by moving object
If wind turbine generator sets operate in grid-following mode, then maximum power tracking is achieved, but black start capability is insufficient due to lack of voltage support
Solution Approach 1:
The patent enables the wind turbine to dynamically switch between grid-following mode (for maximum power tracking) and grid-forming mode (for voltage support during black start). This dynamic operational flexibility allows the wind turbine to provide both active power and voltage support as needed, resolving the contradiction between power extraction efficiency and voltage support capability
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
This method enables flexible output adjustment of wind turbine generator sets and distributed energy storage systems, optimizing system recovery by fully utilizing distributed resources, reducing energy storage capacity requirements, and providing coordinated support to the power grid.
Implementation Method 1
transforming an actually-sampled value of the voltage and an actually-sampled value of the current into a voltage in d-axis and q-axis forms and a current in d-axis and q-axis forms respectively
Data Source
AI summary
Disclosed are a black start control method and system for a distributed energy storage system and a permanent-magnet direct-drive type wind turbine generator set, which belong to the technical field of power system control. The method is suitable for a black start coordinated control method for distributed energy storage and a wind turbine generator set. The method includes: firstly, controlling a pitch angle based on a direct-current voltage, and flexibly adjusting output of the wind turbine generator set according to load demand; and introducing secondary control into a voltage and current correction process of primary control, so as to realize coordinated control over the distributed energy storage system and the wind turbine generator set.