Off-Grid Black Start Using Voltage-Based Parallel Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional black starting processes for new energy power generation systems require upper level synchronization control and communication between master and slave units, leading to higher costs and lower reliability due to dependency on communication speed.
Innovation Solution
A method for starting a new energy power generation system in off-grid mode that eliminates the need for upper level synchronization control and communication between master and slave units by gradually increasing the output voltage of the master unit based on sequentially increasing predetermined voltages, allowing slave units to connect in parallel without synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous starting control with communication between master and slave units is implemented, then synchronization between units is improved, but system cost and device complexity increase
Solution Approach 1:
The patent extracts and removes the communication system from the black starting process. Instead of requiring communication between master and slave units for synchronization, each unit independently detects system voltage and starts based on local measurements, eliminating the need for complex communication infrastructure while maintaining reliable synchronous operation
Solution Approach 2:
Each power generation unit performs self-service by independently detecting the system voltage state and determining its own starting timing based on local voltage measurements. The units automatically synchronize through shared voltage detection without requiring external communication coordination, reducing system complexity while ensuring reliable operation
2Speed
If faster communication is used to improve synchronization speed, then synchronization performance is improved, but system cost increases
Solution Approach 1:
The patent removes the communication system entirely from the synchronization process. Units achieve fast synchronization by independently detecting voltage and autonomously determining starting timing based on local measurements, eliminating communication costs while maintaining rapid synchronization performance
Solution Approach 2:
The patent replaces the communication-based synchronization mechanism with a voltage-detection-based mechanism. Instead of using communication signals to coordinate starting, units respond directly to the physical voltage state of the system, achieving fast synchronization through direct physical measurement rather than communication protocols
3Ease of operation
If conventional synchronous starting is implemented with communication requirements, then power distribution control is improved, but system reliability decreases due to communication dependency
Solution Approach 1:
Each unit independently monitors system voltage and autonomously determines its starting timing based on local voltage detection. This self-service approach eliminates dependency on communication systems, improving reliability while maintaining the ability to evenly distribute power through independent voltage-based control
Solution Approach 2:
The patent implements local feedback control where each unit continuously monitors system voltage and adjusts its starting decision based on real-time voltage measurements. This feedback mechanism ensures reliable power distribution control without requiring communication, as each unit responds directly to the actual system state
Data Source
AI summary
Provided are an off-grid start method and system for a new energy power generation system. The method includes: gradually boosting the voltage of a master according to a plurality of preset voltage given values, and slaves determining, by means of measuring a voltage of the load of a system, a target voltage given value used by the master; and the master determining, by means of monitoring an output current of the master itself, that a slave is successfully connected in parallel, and then continuing to boost the output voltage until all the slaves run in parallel. Therefore, according to the solution, no upper-layer synchronous control is required during a black-start process, and no communication between a master and slaves is required.