Distributed Power Conversion Control for EMS-Free Demand Balancing
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Solution Overview
Problem
The integration of a dedicated energy management system (EMS) controller in distributed power supply systems complicates the system configuration and increases costs, necessitating a more efficient and cost-effective solution for power supply and demand adjustment.
Innovation Solution
A power control apparatus with a conversion circuit that converts DC to AC and a control device adjusting the target value of received power based on predicted power generation and consumption, allowing for demand response without a dedicated EMS controller, utilizing a bidirectional conversion circuit and energy storage apparatus for balancing supply and demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated EMS controller is installed in the distributed power supply system, then power supply and demand adjustment capability is improved, but system complexity and cost increase
Solution Approach 1:
The patent combines the EMS control functions with the existing power control apparatus that manages the conversion circuit. Instead of installing a separate dedicated EMS controller, the control device integrates multiple functions including power conversion control, received power target value determination, and demand response management into a single unified system, thereby reducing system complexity while maintaining adaptability
Solution Approach 2:
The power control apparatus is designed to perform multiple functions: it controls the conversion circuit for DC-AC power conversion, determines target values for received power based on predicted generation and consumption, and executes demand response operations. This multi-functional approach eliminates the need for dedicated EMS hardware while providing comprehensive power management capabilities
2Adaptability or versatility
If a dedicated EMS controller is installed in the distributed power supply system, then power supply and demand adjustment capability is improved, but system cost increases
Solution Approach 1:
The patent merges the EMS control functions with the existing power control apparatus, eliminating the need for separate dedicated EMS controller hardware. This integration reduces component count and system cost while maintaining full demand response and power balance management capabilities
Solution Approach 2:
The power control apparatus autonomously performs demand response operations by predicting power generation amounts and consumption patterns, then automatically adjusting the received power target value to maintain supply-demand balance without requiring external dedicated control systems
3Stability of the object's composition
If the received power target value is adjusted based on predicted power generation and consumption, then power supply and demand balance is improved, but control complexity increases
Solution Approach 1:
The control device performs preliminary actions by predicting future power generation amounts from the distributed power supply and power consumption from demand facilities before actual supply-demand imbalances occur. Based on these predictions, it proactively determines appropriate received power target values to prevent imbalances, thereby maintaining power stability through advance planning rather than reactive control
Solution Approach 2:
The control system implements feedback by continuously monitoring actual power generation and consumption against predicted values, then adjusting the received power target value to maintain balance. The control device compares predicted versus actual values and modifies control parameters accordingly, creating a closed-loop system that maintains power balance through continuous adjustment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient power supply and demand adjustment, reducing the need for a dedicated EMS controller and lowering system costs, while maintaining a stable power balance by charging or discharging energy storage during excess supply or demand conditions.
Implementation Method 1
a conversion circuit that performs reverse conversion of converting power supplied from the distributed power supply from DC to AC and outputting the converted power
Implementation Method 2
utilizing a bidirectional conversion circuit and energy storage apparatus for balancing supply and demand
Data Source
AI summary
A power control apparatus for a distributed power supply interconnected with a power system includes: a conversion circuit that performs reverse conversion of converting power supplied from the distributed power supply from direct current to alternating current and outputting the converted power; and a control device that controls the conversion circuit. The control device changes a target value of received power at a power reception point of the power system on the basis of a predicted value of a power generation amount of the distributed power supply and a predicted value of power consumption of a demand facility, and controls an output of the conversion circuit such that the received power at the power reception point becomes a target value.