Power Set Point Dispatch With SOC-Balanced Real and Reactive Control
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Solution Overview
Problem
Conventional PID controllers in power control systems are slow to adjust power set points, leading to inaccuracies and instability, and do not consider the actual operating characteristics of power sources, resulting in uneven wear, inefficiency, and unbalanced energy storage.
Innovation Solution
A control system that calculates optimized real and reactive power set points using feedforward power compensation, real power set point derivation based on energy storage capacity, SOC balancing, a remainder function, and reactive power set point derivation to minimize apparent power, ensuring precise and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PID controllers are used to dispatch power set points, then the control system is simple to implement, but the response rate is slow and accuracy is poor
Solution Approach 1:
The control system performs preliminary calculations of optimal power set points for each power source based on their operating characteristics before dispatching commands. This includes calculating real power set points considering energy storage capacity and SOC balancing, and reactive power set points to minimize apparent power, thereby achieving fast and accurate response without simple PID controllers
Solution Approach 2:
The system dynamically adjusts power set points based on real-time operating parameters of each power source, including energy storage capacity, state of charge (SOC), and apparent power constraints. This parameter-based optimization enables rapid adaptation to changing conditions while maintaining accuracy
2Productivity
If set points are evenly distributed without considering power source characteristics, then the control system is simple, but efficiency is reduced and wear is uneven
Solution Approach 1:
The control system applies local quality by tailoring power set points to the specific operating characteristics of each power source. Real power set points are calculated based on individual energy storage capacities and SOC levels, while reactive power set points are optimized for each device's apparent power constraints, ensuring efficient and balanced operation
Solution Approach 2:
Before dispatching power commands, the system preliminarily calculates optimal set points for each power source by evaluating their operating characteristics, energy storage capacity, and current state. This preliminary optimization prevents uneven wear and maximizes efficiency by assigning appropriate loads to each device
3Reliability
If SOC imbalance occurs in energy storage devices, then the system continues operating, but efficiency decreases and wear increases
Solution Approach 1:
The control system implements continuous feedback monitoring of state of charge (SOC) for each energy storage device. Based on this feedback, the system dynamically adjusts real power set points to balance SOC across devices, preventing imbalance-induced efficiency losses and extending system reliability through equitable wear distribution
Data Source
AI summary
A control system is provided for controlling multiple power sources of a power system. The control system calculates real and reactive power set points for each of the power sources utilizing: (1) a feedforward power compensation function that provides optimized site level set points; (2) a real power set point derivation scheme in which the real power set points are selected based on the energy capacity of the energy storage devices; (3) a state of charge (SOC) balancing scheme that substantially balances the state of charge of the energy storage devices; (4) a remainder function to account for real-time limits imposed by the equipment; and/or (5) a reactive power set point derivation scheme in which the reactive power set points are selected to minimize the total apparent power across the power sources.