Distributed Power Supply Control for Proportional VSG Power Sharing
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Solution Overview
Problem
Existing control technologies for virtual synchronous generators fail to proportionally divide excess and deficient power among distributed power supplies due to fluctuations in load or power generation, leading to imbalances in power distribution.
Innovation Solution
A distributed power supply management device that includes a communication circuit, operation plan creation circuit, and control parameter generation circuit to manage and proportionally divide power among multiple distributed power supplies with virtual synchronous generator control, ensuring each supply follows the intended power target ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual synchronous generator control is implemented with uniform control parameters, then system inertial force is secured, but proportional division of power among distributed power supplies cannot be maintained during load fluctuations
Solution Approach 1:
The patent applies local quality by assigning different control parameters to different distributed power supplies based on their individual characteristics and planned power ratios. Instead of using uniform control parameters for all units, each power supply receives customized parameters that reflect its specific role in the system, enabling both inertial force provision and accurate proportional power division to coexist.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting control parameters according to the planned power ratio and operational conditions of each distributed power supply. The control parameters are modified to account for load fluctuations and power generation changes, ensuring that the proportional division ratio is maintained while still providing the necessary system inertial force.
2Stability of the object's composition
If control parameters are set to maintain system stability, then inertial force is provided, but power distribution deviates from the intended operation plan during fluctuations
Solution Approach 1:
The patent employs feedback mechanisms where the control parameters are continuously adjusted based on actual system conditions and deviations from the planned power distribution. By monitoring the operational state and comparing it with the intended operation plan, the system dynamically corrects power distribution to maintain both stability and adherence to the planned ratios.
Solution Approach 2:
The patent applies dynamics by making control parameters adaptable and responsive to changing system conditions. Rather than using fixed parameters, the system dynamically adjusts control settings to maintain both system stability and correct power distribution ratios during load fluctuations and power generation changes.
3Power
If excess and deficient power are proportionally divided based on virtual inertia, then system inertial response is maintained, but the original operation plan ratio is not achieved
Solution Approach 1:
The patent applies local quality by customizing control parameters for each distributed power supply according to its specific virtual inertia characteristics and planned power ratio. This allows each unit to contribute to inertial response in proportion to its designated role, ensuring that the overall system maintains both inertial response capability and compliance with the operation plan.
Solution Approach 2:
The patent implements parameter changes by adjusting control parameters to reflect both the virtual inertia requirements and the operation plan ratios. The parameters are modified to ensure that when excess or deficient power occurs, the distribution follows the intended operation plan rather than merely reflecting virtual inertia proportions.
Data Source
AI summary
An operation plan creation circuit creates a power target value of each of a plurality of distributed power supplies on the basis of information received by a communication circuit and capacities of the plurality of distributed power supplies a control parameter generation circuit generates a control parameter of the virtual synchronous generator control implemented in a static inverter of each of the distributed power supplies or information necessary for generating the control parameter. The communication circuit receives measurement information of each of the distributed power supplies, and transmits a control command to each of the distributed power supplies. The control parameter generation circuit generates the control parameter or the information necessary for generating the control parameter on the basis of the information received by the communication circuit, the capacities of the plurality of distributed power supplies, and the power target value of each of the distributed power supplies.