Grid Voltage Stabilization via Reactive Power Control
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Solution Overview
Problem
The integration of renewable energy sources into power systems poses challenges due to fluctuating output levels, leading to instability in voltage and frequency, which can result in power system collapse if not managed effectively.
Innovation Solution
A system that utilizes an Energy Storage System (ESS) and a Power Management System (PMS) to control the magnitude of reactive power supplied to the power system, maintaining voltage within a predefined range by adjusting reactive power based on voltage differences and disconnecting ESS and renewable energy generators when voltage exceeds control limits to prevent system instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If renewable energy sources are integrated into the power system, then eco-friendly power generation is increased, but voltage and frequency stability deteriorate due to output fluctuations
Solution Approach 1:
An Energy Storage System (ESS) is introduced as an intermediary component between the renewable energy source and the power system. The ESS absorbs excess power when renewable output is high and supplies power when output is low, thereby mediating the fluctuations and maintaining voltage and frequency stability in the power system.
Solution Approach 2:
The system dynamically adjusts the charge/discharge state of the ESS based on real-time monitoring of voltage and frequency deviations. By changing the operational parameters of the ESS (charging when voltage is high, discharging when voltage is low), the system compensates for renewable energy fluctuations and maintains stable power system operation.
2Reliability
If the magnitude of reactive power is quickly adjusted to stabilize voltage, then voltage stability is improved, but system oscillation may increase
Solution Approach 1:
The control system operates in periodic cycles, continuously monitoring voltage levels and adjusting reactive power output in a rhythmic manner. The ESS charge/discharge operations are controlled in periodic intervals based on voltage deviation thresholds, providing stable voltage control while avoiding excessive oscillations through regulated periodic adjustments.
Solution Approach 2:
A feedback control mechanism is implemented where the control unit continuously monitors the voltage level and adjusts the reactive power command to the ESS accordingly. When voltage deviates from the reference value, the feedback loop triggers appropriate charge/discharge actions, and when voltage returns to the normal range, the adjustments are reduced or stopped, preventing over-correction and system oscillation.
Data Source
AI summary
A grid voltage stabilization system according to an embodiment of the present invention comprises: a power generation device for generating power by using a new and renewable energy source, and supplying the generated power to a grid; an energy storage system (ESS) for, according to a command value, storing power generated in the power generation device in a battery, or supplying power stored in the battery to the grid in the form of active power and reactive power; and a power management system (PMS) for, when a voltage value of the grid is out of a reference range, controlling the magnitude of the reactive power to be supplied to the grid such that the command value is changed according to the voltage value of the grid to enable the voltage of the grid to be within the reference range.