Power Generation Control Device for Grid Stability
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Solution Overview
Problem
Power generation facilities with storage battery systems of lower rated output than power generation systems face challenges in stabilizing power supply when generated power increases steeply, leading to inadequate charging capacity and potential system supply power change rate deviations.
Innovation Solution
A power generation facility with a photovoltaic or wind power generation system, a storage battery system, and a power generation control device that calculates an allowable power generation value to suppress output when excess power is generated, ensuring the power system's supply change rate remains within a specified range by adjusting the storage battery's charging capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the storage battery system has a rated output lower than the power generation system, then cost is reduced, but the charging capacity becomes insufficient to stabilize power supply when generated power increases steeply
Solution Approach 1:
The patent implements dynamic control of the storage battery charging/discharging operation based on real-time power generation predictions. The control device calculates predicted power generation values for upcoming time periods and dynamically adjusts the battery operation to compensate for power fluctuations, enabling a smaller battery system to achieve power stabilization that would otherwise require a much larger capacity battery.
2Reliability
If the storage battery system operates at maximum charging capacity to suppress power changes, then power supply stability is improved, but the ability to respond to subsequent power deficits is reduced
Solution Approach 1:
The control device performs preliminary calculations of predicted power generation values for future time periods before making charging/discharging decisions. By anticipating future power generation trends, the system proactively adjusts battery operations to maintain flexibility, ensuring that the battery retains appropriate charge levels to respond to both power surges and deficits as they occur.
Solution Approach 2:
The system continuously monitors actual power generation against predicted values and adjusts battery charging/discharging operations in real-time. This feedback mechanism allows the control device to correct deviations from predicted patterns and maintain optimal battery state of charge, balancing the need to suppress power changes with the need to respond to future power deficits.
Data Source
AI summary
A power generation facility 10 includes a power generation system 30, a storage battery system 40, and an in-facility electric wire 21. The power generation facility 10 causes the storage battery system 40 to be charged with some of power supplied by the power generation system 30 to the in-facility electric wire 21 so that change per control cycle in the power supplied to a power system is within a stipulated proportion of rated output of the power generation facility 10. The power generation control device 1 calculates an allowable power generation value for which a power value according to the stipulated proportion of the rated output and a maximum value of charging power per control cycle of the storage battery system 40 are added to a value for which a current value of the power charged by the storage battery system 40 is subtracted from a current value of the power supplied by the power generation system 30 to the in-facility electric wire 21. In addition, the power generation control device 1 suppresses the power supplied by the power generation system 30 to the in-facility electric wire 21 to be equal to or smaller than the allowable power generation value, in a case where the power supplied from the power generator is larger than the allowable power generation value in the next control cycle.