Distributed Power Supply Fault Control With Precalculated Reactive Power
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Solution Overview
Problem
In electric power systems, existing control apparatuses fail to effectively manage distributed power supplies during faults, leading to inadequate reactive power provision and potential voltage drops, which can cause consecutive tripping of the power generation system.
Innovation Solution
A control apparatus that calculates and outputs command signals for distributed power supplies to manage reactive electric power and output suppression amounts in advance, using a first calculation unit and command output unit to respond to faults by pre-calculating reactive electric power and output suppression amounts for various fault types, and updating these values based on system data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time power flow calculation is performed when a fault occurs, then the control accuracy is improved, but the response time becomes too long causing voltage drops and consecutive tripping
Solution Approach 1:
The control apparatus pre-calculates and stores reactive electric power values for multiple distributed power supplies under various fault conditions before faults occur. When a fault happens, the system simply retrieves and outputs the pre-calculated values, eliminating the need for time-consuming real-time calculations while maintaining accurate control.
2Reliability
If reactive power is increased to prevent voltage drops, then the voltage stability is improved, but the output suppression amount increases reducing system productivity
Solution Approach 1:
The control apparatus calculates and outputs different reactive electric power values for each distributed power supply based on its specific location and characteristics in the power system. This localized control ensures that each power supply contributes appropriately to voltage stability without unnecessary output suppression, optimizing both reliability and productivity.
3Reliability
If the control apparatus manages multiple distributed power supplies during faults, then the system reliability is improved, but the device complexity increases
Solution Approach 1:
The control apparatus pre-calculates reactive electric power values for multiple distributed power supplies under various fault conditions and stores them in advance. When faults occur, the system simply outputs the appropriate pre-calculated values, managing multiple power supplies effectively without requiring complex real-time calculations, thus improving reliability while keeping the control system relatively simple.
Data Source
AI summary
Even when a fault occurs on an electric power system, a command signal based on appropriate calculation is given to a distributed power supply. Provided is a control apparatus configured to control a plurality of distributed power supplies connected to an electric power system. The control apparatus comprises: a first calculation unit configured to calculate in advance reactive electric power to be output by each of the distributed power supplies in the event of a fault on the electric power system; and a command output unit configured to output, to each of the distributed power supplies, a command signal for causing each of the distributed power supplies to output the reactive electric power calculated in advance by the first calculation unit when it is detected that a fault has occurred on the electric power system.