Renewable AC Microgrid Black Start With Stable Voltage and Frequency
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Solution Overview
Problem
Existing black start technologies lack coordinated participation of wind power, photovoltaic power, and energy storage, leading to inefficiencies in restoring power systems after failures and unstable starting voltage and frequency.
Innovation Solution
A system and method integrating a renewable energy alternating current microgrid module, power transmission and distribution module, and thermal power generation module, where the microgrid module includes photovoltaic, wind power, and energy storage units, transmitting electrical energy to the thermal power generation module to start auxiliary equipment, using droop control for voltage and frequency regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing black start technologies are used, then power system restoration can be achieved, but the restoration process is inefficient and causes unstable voltage and frequency
Solution Approach 1:
The patent combines multiple power sources (wind power, photovoltaic power, and thermal power) and energy storage devices into an integrated microgrid system for black start operations. This merging allows coordinated participation of different energy sources to improve restoration efficiency while maintaining voltage and frequency stability through unified control.
Solution Approach 2:
The microgrid system is designed to perform multiple functions: generating power from renewable sources, storing energy, regulating voltage and frequency, and coordinating black start operations across different power plants. This multi-functionality enables a single system to address both restoration efficiency and stability requirements.
2Adaptability or versatility
If large-scale energy storage is deployed, then peak regulation and frequency regulation services are improved, but system complexity increases
Solution Approach 1:
The patent introduces a microgrid controller as an intermediary device that coordinates between energy storage devices, renewable energy sources, and the thermal power plant. This controller simplifies the overall system management by providing centralized control logic that handles peak regulation and frequency regulation without requiring complex interconnections between all components.
3Reliability
If coordinated participation of wind power, photovoltaic power, and thermal power is implemented, then black start effectiveness is improved, but control complexity increases
Solution Approach 1:
The patent divides the black start control process into distinct segments: wind power generation control, photovoltaic power generation control, energy storage discharge control, and thermal power plant startup control. Each segment is managed independently with specific control strategies, and the microgrid controller coordinates these segments in a structured sequence, reducing overall control complexity.
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 effective black start operations by enriching energy storage functions and stabilizing voltage and frequency, ensuring coordinated participation of wind, photovoltaic, and thermal power, reducing economic losses and system damage from power failures.
Implementation Method 1
a photovoltaic panel, a photovoltaic DC/AC inverter apparatus, a photovoltaic boost transformer
Implementation Method 2
a wind turbine set, a wind power AC/DC (alternating current/direct current) rectifier apparatus
Data Source
AI summary
A system and a method of black start for a combined operation of wind power, photovoltaic power, energy storage, and thermal power includes a renewable energy alternating current microgrid module, a power transmission and distribution module, and a thermal power generation module, the power transmission and distribution module is coupled to the renewable energy alternating current microgrid module and the thermal power generation module respectively. The renewable energy alternating current microgrid module includes a photovoltaic unit, a wind power unit, and an energy storage unit. The power transmission and distribution module is configured to transmit the electrical energy generated by the renewable energy alternating current microgrid module to the thermal power generation module. The thermal power generation module is configured to start an auxiliary equipment using the electrical energy transmitted by the power transmission and distribution module.