PV Power Conditioning System Phase Advancing Control
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Solution Overview
Problem
Existing power management systems fail to effectively utilize power during limitation periods due to unbalanced supply-demand in commercial power systems, where reverse power flow from consumer-generated power back to the grid is not adequately controlled, leading to inefficiencies and unused energy.
Innovation Solution
A management device and control method that adjusts the power output of a power generation facility by using phase advancing control and increasing charging power of a storage facility during limitation periods, ensuring effective utilization of generated power by aligning output with on-site consumption and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power generation output is limited during limitation periods to maintain supply-demand balance, then reverse flow to commercial power system is suppressed, but generated power cannot be effectively utilized and is wasted
Solution Approach 1:
The invention converts the harmful reverse flow into a beneficial local power supply by prioritizing on-site consumption. Power that would otherwise be exported to the commercial grid during limitation periods is redirected to meet local demand, transforming a problematic export into a useful resource for the consumer's own facilities.
Solution Approach 2:
The invention introduces a power management intermediary that controls power distribution during limitation periods. This intermediary device manages the flow between generation facilities, storage facilities, and consumption facilities, ensuring power is allocated to on-site needs rather than being exported to the commercial grid.
2Power
If power is suppressed during limitation periods according to limitation information, then output upper limit is maintained, but charging power of storage facility is insufficient and power cannot be effectively stored
Solution Approach 1:
The invention performs preliminary charging of storage facilities before limitation periods begin. By anticipating the limitation period and charging storage facilities in advance when power availability is higher, the system ensures that power can be effectively stored and utilized when the limitation period commences, rather than attempting to charge during the restricted period.
Solution Approach 2:
The invention dynamically adjusts charging power based on the timing relative to limitation periods. The control system varies charging rates and strategies depending on whether the system is in a normal period or approaching a limitation period, optimizing storage utilization across different operational phases.
3Object-affected harmful factors
If phase advancing control is used to suppress power output, then reverse flow is reduced, but power generation amount is decreased and on-site consumption is insufficient
Solution Approach 1:
The invention changes the parameter of power output timing by using phase advancing control. This shifts the power generation curve forward in time, causing power to be generated slightly earlier than the peak demand period, thereby reducing reverse flow while still meeting on-site consumption needs during the shifted peak period.
Data Source
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Figure 2B
AI summary
A photovoltaic power conditioning system (PV-PCS) (3) outputs power generated by a photovoltaic (PV) panel (2). An electric vehicle power conditioning system (EV-PCS) (5) charges an electric vehicle (EV) (6) with power supplied from a commercial power system (PS) or the power outputted from the PV-PCS (3). The PV-PCS (3) directly or indirectly receives limitation information (13) from a server (12). During a limitation period in which the power to be outputted from the PV-PCS (3) is limited, a management device (10) obtains a suppressed power generation amount on the basis of a readily estimated power generation amount of the PV panel (2), and controls the PV-PCS (3) so that charging power increases by having the suppressed power generation amount as an upper limit.