Voltage control device and voltage control method
The voltage control device adjusts inverter output currents using virtual impedance and voltages to stabilize the power system by matching required active and reactive currents, addressing the instability caused by AC voltage fluctuations.
JP7865458B2Active Publication Date: 2026-05-26TMEIC CORP (100 00)
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TMEIC CORP (100 00)
- Filing Date
- 2023-06-30
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing voltage-controlled Grid Forming Inverter (GFM) systems struggle to maintain stable active and reactive currents when the AC voltage of the power grid fluctuates, risking instability in the power grid.
Method used
A voltage control device and method that calculates virtual impedance and generates virtual active and reactive voltages to adjust the output currents of an inverter to match the required active and reactive current command values, using a control device connected to the inverter to stabilize the power system during voltage fluctuations.
Benefits of technology
The solution ensures that the inverter outputs the necessary active and reactive currents to stabilize the power system, even when AC voltage fluctuates, thereby maintaining grid stability.
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Smart Images
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Abstract
This voltage control apparatus is provided with: an inverter that converts DC power outputted from a battery into AC power and that supplies the AC power to a power system; and a control device that is connected to the inverter. The control device, when a voltage drop of the output voltage of the inverter is equal to or higher than a threshold due to fluctuation of the AC voltage of the power system, executes: a process for calculating a virtual impedance by using a variable including an active voltage command value and a reactive voltage command value calculated by a voltage command value, and an active current command value and a reactive current command value calculated by the output voltage of the inverter and the voltage command value; a process for calculating a virtual active voltage and a virtual reactive voltage by multiplying, by the virtual impedance, each of the active current and the reactive current calculated by the output current of the inverter; and a process for controlling the voltage so that the active current and the reactive current respectively approach the active current command value and the reactive current command value required for the power system, on the basis of the virtual active voltage and the virtual reactive voltage.
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