Microgrid PCS Efficiency Scheduling via Battery SOC Control
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Solution Overview
Problem
Microgrid systems face inefficiencies in power conditioning systems (PCS) during charging and discharging, leading to increased power supply costs due to low efficiency at low capacity levels, which affects the stability of renewable energy-based power generation and consumption.
Innovation Solution
A microgrid operation device and method that schedules the output of emergency internal combustion generators, controllable loads, and battery operations considering PCS efficiency, maintaining the battery's state of charge within a preset range to optimize energy management and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If charging/discharging operations are scheduled without considering PCS efficiency, then scheduling simplicity is improved, but power supply cost increases due to low efficiency at low capacity levels
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the charging/discharging capacity parameters of the BESS based on PCS efficiency characteristics. The scheduling unit modifies operational parameters (charging/discharging capacity) to keep the PCS operating within its high-efficiency range (above 20% capacity), thereby reducing energy loss and power supply costs while maintaining manageable scheduling complexity through algorithmic optimization.
2Reliability
If BESS charging/discharging is scheduled to maintain stable power supply, then reliability is improved, but PCS efficiency decreases when operating at low capacity levels
Solution Approach 1:
The patent implements dynamics by enabling the BESS charging/discharging capacity to dynamically adjust based on real-time operational conditions and PCS efficiency characteristics. The scheduling unit continuously optimizes the BESS operational state, transitioning between charging, discharging, and idle modes to maintain both power supply stability and PCS high-efficiency operation, avoiding static low-capacity operations that reduce efficiency.
Solution Approach 2:
The patent applies feedback mechanisms where the scheduling unit monitors PCS operational efficiency and uses this information to adjust future charging/discharging schedules. By incorporating efficiency feedback into the scheduling algorithm, the system learns from past operations and optimizes future decisions to maintain PCS operation within high-efficiency ranges while ensuring reliable power supply stability.
3Adaptability or versatility
If PCS operates at low charging/discharging capacity (0-20%), then adaptability to varying demand is improved, but efficiency deteriorates significantly
Solution Approach 1:
The patent addresses this contradiction by changing the operational parameters of the BESS charging/discharging capacity to prevent the PCS from operating in the low-efficiency 0-20% capacity range. The scheduling algorithm adjusts capacity parameters dynamically, coordinating BESS operations with demand patterns to maintain PCS operation above the 20% efficiency threshold while still providing adequate demand response flexibility through optimized timing and magnitude of charging/discharging cycles.
Data Source
AI summary
The present invention relates to a power conditioning system (PCS) efficiency-considered microgrid operation device comprising: a scheduling unit for scheduling outputs of a controllable load, a battery, and an emergency internal combustion generator operated in a microgrid; and an operation control unit for controlling the operation of the battery, the emergency internal combustion generator, and the controllable load according to charging/discharging of the battery, the output or the emergency internal combustion generator, and the output of the controllable load, which have been scheduled by the scheduling unit, wherein the scheduling unit schedules charging/discharging by considering the efficiency of a PCS such that a mate of charge (SOC) of the battery is maintained within a preset range. According to the present invention, the microgrid can be efficiently operated by considering the charging/discharging efficiency of the PCS.