Microgrid Power Management with Dual-Cycle Operation Plans
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Solution Overview
Problem
Existing power management systems face challenges in maintaining power balance during autonomous operation in microgrids due to prediction errors in electric power generation and consumption, leading to unnecessary discharge of storage batteries and inefficiencies in energy utilization.
Innovation Solution
A power management system that includes a measuring instrument, communication unit, information collection unit, power generation prediction unit, power consumption prediction unit, operation plan creation unit, and transmission management unit, which measures and predicts power consumption and generation, and creates and updates operation plans to balance power distribution among distributed power supplies, adjusting voltage frequency to manage excess or shortage of power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If operation plans are updated frequently to correct prediction errors, then power balance accuracy is improved, but computational load increases
Solution Approach 1:
The operation plan update process is segmented into two distinct cycles: a first operation plan updated at a first cycle (equal to or greater than information collection cycle) and a second operation plan updated at a second cycle (longer than first cycle). This segmentation allows the system to maintain power balance accuracy through the more frequently updated first plan while reducing computational load by updating the second plan less frequently.
Solution Approach 2:
The system implements periodic updates of operation plans with different cycles. The first operation plan is updated periodically at the first cycle to maintain accurate power balance, while the second operation plan is updated periodically at the longer second cycle. This periodic action with varying frequencies optimizes both accuracy and computational efficiency.
2Device complexity
If prediction cycle is extended to reduce computational frequency, then computational load is reduced, but response speed to power imbalances deteriorates
Solution Approach 1:
The response mechanism is segmented into two layers: the first operation plan provides rapid response at the first cycle to immediate power imbalances, while the second operation plan provides broader adjustments at the longer second cycle. This segmentation enables the system to maintain fast response speed for critical adjustments while reducing overall computational load through less frequent comprehensive planning.
Solution Approach 2:
The system dynamically adjusts the response frequency based on the type of operation plan. The first operation plan operates at a higher frequency (first cycle) to respond dynamically to immediate power imbalances, while the second operation plan operates at a lower frequency (second cycle). This dynamic multi-cycle approach optimizes both response speed and computational efficiency.
3Duration of action of moving object
If storage battery capacity is increased to ensure 72-hour LCP, then life continuity performance is improved, but cost increases
Solution Approach 1:
The system merges the functions of multiple storage batteries into a coordinated microgrid system where batteries can charge and discharge in synchronization. This combining effect allows the collective storage capacity to effectively support 72-hour LCP while individual batteries can remain smaller than a single 72-hour battery would require, thereby reducing overall cost.
Solution Approach 2:
Storage batteries in the microgrid serve multiple functions: they provide backup power for LCP, enable peak-cut operations during daytime, and participate in coordinated charge/discharge cycles. This multi-functionality allows smaller individual battery capacities to achieve the same effective backup duration as a single large battery, reducing total storage capacity requirements and cost.
4Reliability
If distributed power supplies operate autonomously during power failure, then system reliability is improved, but power balance control becomes more difficult
Solution Approach 1:
The microgrid implements feedback mechanisms where information about power generation and consumption is continuously collected and used to update operation plans. This feedback loop enables autonomous operation while maintaining power balance, as the system automatically adjusts based on real-time conditions without requiring complex manual control.
Solution Approach 2:
The system performs preliminary actions by creating operation plans in advance (first operation plan at first cycle, second operation plan at second cycle) that anticipate power balance requirements. This preliminary planning simplifies autonomous operation control during power failures, as the system follows pre-established adjustment strategies rather than requiring complex real-time decision-making.
Data Source
AI summary
A town storage battery power conversion device outputs an AC voltage to a distribution system during a power failure. Electric power generated by a solar cell installed in each consumer house is converted into an AC voltage by a solar cell power conversion device and output to a consumer premises distribution system to which a load is connected. In an autonomous operation during a power failure, an operation plan for a distributed power supply is updated in a cycle longer than a cycle of an operation plan for a town storage battery. In the autonomous operation, the town storage battery power conversion device changes an AC voltage frequency according to a difference between electric power output from the town storage battery and the operation plan. The solar cell power conversion device has a function of modifying a control target value for the solar cell according to the AC voltage frequency.