Parallel Power Converter Control Using Unified Virtual Generator Phase
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Solution Overview
Problem
Existing power storage facilities operating as virtual synchronous generators in parallel lack coordination, leading to unstable system operation.
Innovation Solution
An electric power control system with multiple power converters connected in parallel, utilizing a power generator simulation unit to simulate synchronous generator characteristics and generate control signals based on aggregate active power, stabilizing the system by simulating a synchronous generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power storage facilities are caused to operate as separate virtual synchronous generators in parallel, then each facility can independently provide virtual synchronous generator functionality, but the facilities do not coordinate together leading to unstable system operation
Solution Approach 1:
The patent merges multiple power storage facilities into a single unified virtual synchronous generator by aggregating their active power outputs. The control device calculates the aggregate active power from all connected power storage facilities and uses this combined value to generate a unified phase angle for the alternating current voltage. This merging approach ensures coordinated operation and stable system performance while maintaining the virtual synchronous generator functionality across all facilities.
2Ease of operation
If each power storage facility operates independently as a virtual synchronous generator, then individual facility control is simplified, but coordination between facilities is lost resulting in power flow imbalances
Solution Approach 1:
The control device implements feedback by continuously monitoring the aggregate active power output from all power storage facilities and using this information to dynamically adjust the phase angle of the alternating current voltage. The power generator simulation unit generates the phase based on the real-time aggregate active power, creating a closed-loop control system that automatically corrects power flow imbalances and maintains coordinated operation among all facilities.
Data Source
AI summary
An electric power control system includes a plurality of power converters connected in parallel. Each power converter, among the plurality of power converters, converts a direct-current power of an electricity storage device connected to the power converter into an alternating-current power, and outputs the alternating-current power to the power system. The electric power control system further includes: a power generator simulation unit to simulate characteristics of the synchronous generator based on an aggregate active power to generate a phase of the alternating-current voltage; a signal generation unit to generate a control signal for the power converter, based on the phase of the alternating-current voltage. The power generator simulation unit generates a first angular frequency based on a first difference between the aggregate active power and a target value for the aggregate active power, and generates, based on the first angular frequency, the phase of the alternating-current voltage.