Multi-terminal Power Conversion for Asynchronous Grid Interconnection
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Solution Overview
Problem
Conventional methods fail to effectively integrate a large amount of renewable energy into power grids due to the lack of synchronization capability, leading to frequency instability and potential cascading power failures, and require complex and costly infrastructure for power interchange among multiple grids.
Innovation Solution
A multi-terminal power conversion device with self-commutated power converters and a control unit that measures and balances power flow, allowing asynchronous interconnection of power grids, reducing the need for excessive interconnection capacity and enabling flexible power interchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional synchronous grid methods are used to integrate renewable energy, then grid frequency stability is maintained through synchronizing power, but the amount of renewable energy that can be integrated is limited due to lack of synchronization capability
Solution Approach 1:
The invention divides the conventional synchronous grid into multiple asynchronous grids that can operate independently with different frequencies. Each grid segment can integrate renewable energy locally without requiring synchronization with other segments, thereby increasing overall renewable energy integration capacity while maintaining frequency stability within each segment through local control mechanisms.
Solution Approach 2:
The invention introduces power conversion devices as intermediaries between asynchronous grids and renewable energy sources. These converters act as mediators that enable power transfer between grids operating at different frequencies without direct synchronization, allowing renewable energy to be integrated into the grid system while maintaining frequency stability through the intermediary conversion process.
2Adaptability or versatility
If renewable energy power sources are introduced without synchronization capability, then renewable energy integration is simplified, but frequency stability is impaired and cascading power failures may occur
Solution Approach 1:
The invention segments the grid system into multiple asynchronous zones that can independently accommodate renewable energy sources without requiring them to provide synchronization capability. Each zone operates independently with its own frequency control, allowing renewable energy integration flexibility while maintaining frequency stability through local segmentation and isolation.
Solution Approach 2:
The invention changes the fundamental parameter of grid operation from synchronous (single frequency) to asynchronous (multiple frequencies). This parameter change allows renewable energy sources to be integrated without requiring synchronization capability, as each asynchronous grid can operate at its own frequency while power conversion devices manage the interconnections.
3Productivity
If multiple power grids are interconnected to enable power interchange, then renewable energy can be shared among grids, but complex and costly infrastructure is required
Solution Approach 1:
The invention develops universal power conversion devices that can operate in multiple modes and connect to different types of grids (synchronous and asynchronous). These multi-functional devices enable power interchange between multiple grids while reducing overall infrastructure complexity, as a single device type can serve various interconnection needs rather than requiring specialized infrastructure for each grid pair.
Solution Approach 2:
The invention uses power conversion devices as intermediaries to simplify multi-grid interconnections. Rather than requiring direct complex infrastructure between each pair of grids, the converter acts as a mediating node that manages power flow between multiple grids, thereby reducing overall infrastructure complexity while maintaining efficient power interchange capability.
Data Source
AI summary
The present invention provides a multi-terminal power conversion device, a multi-terminal power transfer device, and a power network system which allows an existing power grid to be divided into a plurality of power grids that can be interconnected together and operated stably via existing or new transmission lines. An inter-power grid asynchronous interconnection network system includes a multi-terminal power conversion device characterized by connecting together a plurality of asynchronous power grids including a bulk power grid and controlling power so that the sum of inflow power and outflow power is zero. An intra-power grid synchronous network system includes a power apparatus control terminal device with means for controlling power for a power apparatus installed in an autonomous power grid. A plurality of inter-power grid asynchronous interconnection network systems are connected to an intra-power grid synchronous network system to integrate the power control with communication control.