Virtual Synchronous Inverter Parameter Switching for Load Disturbances
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Solution Overview
Problem
The increasing integration of renewable energy sources into power grids, which lack inertia, poses stability challenges due to fixed parameter values in virtual synchronous inverter control, particularly during sudden load changes, leading to potential instability and operational burdens on power supply devices.
Innovation Solution
A power supply device with an inverter and a control unit that adjusts inertia and regulating force constants dynamically by acquiring and changing parameter values, allowing for flexible control of grid frequency and improved stability, using a user-friendly interface for grid operators to specify new parameter values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual synchronous inverter control with fixed parameter values is used, then the inverter can simulate synchronous generator characteristics, but the stability of power supply decreases during sudden load changes
Solution Approach 1:
The patent implements dynamic adjustment of virtual inertia constant and regulating force constant based on grid frequency deviations. When frequency deviates from nominal value, the controller automatically modifies these parameters to provide appropriate stabilizing effect, transforming the static control into dynamic adaptive control that responds to real-time grid conditions
Solution Approach 2:
The patent changes the parameter values of the virtual synchronous inverter control system based on operating conditions. By adjusting the virtual inertia constant and regulating force constant according to frequency deviations, the system adapts its characteristics to maintain stability under varying load conditions, directly addressing the limitation of fixed parameters
2Reliability
If parameter values are fixed during operation, then the control system is simple, but it cannot maintain stability during disturbances such as sudden load changes
Solution Approach 1:
The patent employs feedback control by continuously monitoring grid frequency and using this information to adjust the virtual inertia constant and regulating force constant. This closed-loop control mechanism enables the system to automatically respond to disturbances while maintaining manageable complexity through structured feedback processing
Solution Approach 2:
The control system performs self-adjustment by automatically modifying its own parameter values based on frequency measurements. The virtual synchronous inverter controller independently determines appropriate parameter changes without external intervention, enabling the system to maintain stability through self-service adaptation
3Reliability
If renewable energy power sources are increased in the power grid, then the low-carbon society goal is advanced, but the stability of power supply decreases due to lack of inertia
Solution Approach 1:
The patent uses virtual synchronous inverter control to copy the inertia characteristics of synchronous generators. By simulating the dynamic behavior of traditional generators through control algorithms, renewable energy sources can provide frequency stabilization services without physical rotating mass, enabling high renewable penetration while maintaining stability
Data Source
AI summary
According to one embodiment, a power supply device connected to a power grid is provided. The power supply device includes an inverter, a control unit configured to control operation of the inverter using a first parameter value so as to simulate characteristics of a synchronous generator, and an acquisition unit configured to obtain a second parameter value different from the first parameter value. The control unit is configured to control the operation of the inverter by changing the first parameter value to the acquired second parameter value.