Voltage Fluctuation Suppression via Active Reactive Power Ratio Control
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Solution Overview
Problem
Conventional methods for voltage fluctuation suppression in power distribution grids require impedance measurement and additional instrumentation, making them inefficient and requiring repeated measurements when the grid configuration changes, especially with the increasing penetration of solar power generation facilities.
Innovation Solution
A voltage-fluctuation suppression device that controls the ratio between active and reactive power output to match the ratio of power flowing between grids, using a storage battery system and controller to absorb surplus power without needing impedance measurement, thereby stabilizing voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If impedance measurement is performed to control active and reactive power, then voltage fluctuation suppression is achieved, but additional measurement instruments are required and the system becomes more complex
Solution Approach 1:
The power storage device uses its own control unit to calculate impedance based on voltage and current data already being measured for other control purposes. The system serves itself by utilizing existing measurement data to derive impedance information without requiring separate measurement instruments, thereby reducing system complexity while maintaining voltage fluctuation suppression capability
Solution Approach 2:
The control unit performs multiple functions: it measures voltage and current for power management purposes and simultaneously calculates impedance from these measurements for voltage fluctuation suppression. This multi-functionality eliminates the need for dedicated impedance measurement instruments, resolving the contradiction between achieving reliable voltage control and reducing device complexity
2Ease of manufacture
If impedance is preliminarily measured and fixed values are used for control, then control implementation is simplified, but the system cannot adapt when power distribution grid configuration changes
Solution Approach 1:
The control unit dynamically calculates impedance values based on real-time voltage and current measurements from the power distribution grid. Instead of using fixed preliminarily measured impedance values, the system continuously updates impedance calculations to reflect current grid conditions, enabling adaptation to configuration changes while maintaining simple control implementation through automated recalculation
Solution Approach 2:
The system implements feedback by continuously measuring voltage and current at the connection point and using these measurements to recalculate impedance values. This feedback mechanism ensures that when power distribution grid configuration changes occur, the control unit automatically detects the changes through measurement data and adjusts impedance calculations accordingly, maintaining both simplicity and adaptability
Data Source
AI summary
When a voltage-fluctuation suppression device suppresses, for input/output of connected power between a first power grid, or a commercial power grid, and a second power grid including a power generation device and grid-connected to the first power grid, voltage fluctuations in the first power grid, a control unit includes a voltage allowable range computing unit, controls a ratio between active and reactive power output by the voltage-fluctuation suppression device to be equal to a ratio between active and reactive power of power flowing between the first and second power grids, and controls the ratio between the active and reactive power output by the voltage-fluctuation suppression device to be equal to the ratio between the active and reactive power of power flowing between the first and second power grids.