Energy Storage Control for Renewable Line Capacity Constraints
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Solution Overview
Problem
The expansion of new and renewable energy power plants poses challenges for the electrical power system in stabilizing power supply and efficiently using existing facilities, particularly in managing power transmission without expanding infrastructure, which can lead to line instability and increased carbon emissions.
Innovation Solution
An energy storage system that includes an energy storage device, a power management device, and a power conversion device, which monitors and controls power flow based on the reference capacity of the line and the amount of power generated by new and renewable energy power plants, predicting future power demands and adjusting operations to stabilize the system and optimize line utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If new and renewable energy power plants are expanded, then carbon dioxide emission reduction is achieved, but line stability deteriorates and infrastructure expansion is required
Solution Approach 1:
The energy storage system performs preliminary charging during periods of low demand and discharges during peak demand periods. The controller predicts future power generation and consumption patterns, allowing the system to pre-position energy reserves before line stability issues arise, thereby accommodating renewable energy expansion without compromising line stability.
Solution Approach 2:
The energy storage system acts as an intermediary between the renewable energy power plants and the transmission line. It buffers the variability and unpredictability of renewable energy output, smoothing power flow to the grid and preventing stability issues while enabling continued expansion of carbon-free energy sources.
2Object-affected harmful factors
If new and renewable energy power plants are expanded, then carbon dioxide emission reduction is achieved, but infrastructure expansion is required
Solution Approach 1:
The energy storage system serves multiple functions simultaneously: it stores energy from renewable sources, stabilizes line operations, delays infrastructure expansion needs, and provides auxiliary services such as voltage support and frequency regulation. This multi-functionality allows a single system to address multiple challenges of renewable energy integration without requiring separate infrastructure solutions for each problem.
Solution Approach 2:
The energy storage system autonomously manages its own charging and discharging operations based on real-time monitoring of power generation and consumption patterns. The controller automatically makes decisions about energy flow without requiring manual intervention or complex external coordination, enabling the system to serve itself while simultaneously addressing infrastructure constraints.
3Reliability
If power flow is increased to meet demand, then power supply stability is improved, but line capacity constraints are exceeded
Solution Approach 1:
The energy storage system operates in periodic cycles of charging and discharging. It charges during periods of low demand or excess renewable generation and discharges during peak demand periods. This periodic operation allows the system to deliver stable power supply during critical times without requiring continuous high power flow through the transmission line, thereby respecting line capacity constraints.
Solution Approach 2:
The energy storage system changes the temporal distribution of power flow parameters. By storing energy when line capacity is underutilized and releasing it when capacity is needed, the system effectively transforms the power delivery profile without exceeding instantaneous line capacity limits, thus maintaining stability within existing infrastructure constraints.
Data Source
AI summary
An energy storage system includes an energy storage device that stores energy generated from a new and renewable energy power plant, a power management device that monitors an amount of power of the new and renewable energy power plant, determines an operation mode of the energy storage device based on a result of monitoring a reference capacity of a line connected to the new and renewable energy plant and the amount of power, and controls a power capacity flowing through the line according to the operation mode, and a power conversion device that receives a command corresponding to the operation mode from the power management device and controls an operation of the energy storage device according to the command.