Reactive Power Control for Grid Stability with Renewable Energy
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Solution Overview
Problem
The increasing instability of renewable energy power generation affects the predictability of voltage and frequency in electric power grids, making it difficult to optimally control reactive power at load terminal points, especially when combined with traditional power generation sources.
Innovation Solution
A reactive power control system that includes an input portion for gathering reactive power data from automatic voltage regulators, synchronous condensers, and renewable energy sources, a calculation unit to determine setting values, and an output portion to adjust reactive power in real-time, ensuring optimal control at each load terminal point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable energy power generation equipment is increased to improve environmental sustainability, then the ratio of renewable energy power in the whole generated electric power increases, but the voltage and frequency of the electric power shows unpredictable behavior making it difficult to optimally control the voltage and frequency in each load terminal point
Solution Approach 1:
The invention divides the electric power grid into multiple control regions with load terminal points, where each region has dedicated reactive power control equipment. This segmentation allows localized optimization of voltage and frequency control, addressing the unpredictability caused by renewable energy fluctuations in specific areas without affecting the entire grid.
Solution Approach 2:
The invention implements a feedback mechanism where reactive power control equipment continuously monitors voltage and frequency at load terminal points and adjusts reactive power output accordingly. This real-time feedback enables the system to respond to unpredictable changes from renewable energy sources and maintain stable voltage and frequency control.
2Adaptability or versatility
If the ratio of renewable energy power generation increases, then environmental sustainability improves, but the power generated by renewable energy is difficult to be completely replaced with base load power generation due to instability
Solution Approach 1:
The invention combines renewable energy power generation with base load power generation in a hybrid system. Reactive power control equipment coordinates the output from both renewable sources and traditional base load plants, merging their strengths to provide both environmental sustainability and stable power supply that can meet base load requirements.
Solution Approach 2:
The invention dynamically adjusts operating parameters of power generation equipment based on real-time conditions. By changing parameters such as reactive power output, voltage levels, and frequency control settings, the system optimizes the combination of renewable and base load power to maintain stability while maximizing renewable energy utilization.
3Reliability
If reactive power control equipment is designed to handle unpredictable renewable energy input, then the ability to control reactive power in each load terminal point improves, but the complexity of the control system increases
Solution Approach 1:
The invention incorporates preliminary action by pre-configuring reactive power control equipment at strategic locations in the grid. These equipment are pre-positioned to provide reactive power support before voltage and frequency deviations occur, enabling faster response to renewable energy fluctuations without requiring complex real-time decision-making algorithms.
Data Source
AI summary
The invention provides reactive power control equipment that controls the reactive power adjusted by a synchronous condenser coupled to an electric power grid and the reactive power of the electric power supplied to the electric power grid, to optimally control the reactive power in each load terminal point (power consumption area), considering instability of the electric power supplied from renewable energy power generation equipment. The above equipment includes an input portion that inputs information of reactive power including reactive power adjusted by an automatic voltage regulator of automatically adjusting a voltage of electric power generated by an electric power generator and supplied to an electric power grid, reactive power adjusted by a synchronous condenser coupled to the electric power grid, reactive power of electric power generated by the renewable energy power generation equipment, and reactive power set in each load terminal point (consumer area) of consuming the electric power; a calculation unit that calculates each setting value of reactive power adjusted by the synchronous condenser and the automatic voltage regulator, using the information of the reactive power input in the input portion; and an output portion that outputs the setting values of the reactive power calculated by the calculation unit respectively to the synchronous condenser and the automatic voltage regulator.