PV PCS Startup Control via Independent Operation Test
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Solution Overview
Problem
The grid interconnection apparatus frequently repeats startup and stop operations due to insufficient solar radiation or cloudy weather conditions, leading to inefficient power supply from photovoltaic cells.
Innovation Solution
A startup control method that involves an independent operation phase where power is supplied to a storage battery before interconnected operation, allowing for measurement of output power, and only initiating interconnected operation when the output power exceeds a predetermined threshold, thereby preventing immediate shutdown after startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the grid interconnection apparatus performs immediate startup control when output power is detected, then the apparatus can quickly start operation, but it causes repeated startup and stop cycles when output power is insufficient
Solution Approach 1:
The patent applies preliminary action by performing an independent operation test before full interconnected operation. The controller first activates the grid interconnection relay and performs a test operation to measure output power, then decides whether to proceed with full operation based on this preliminary measurement. This prevents immediate full startup when conditions are insufficient, avoiding repeated startup-stop cycles.
2Adaptability or versatility
If the grid interconnection apparatus performs interconnected operation with low output power, then it can start operation in early morning or cloudy weather, but it causes immediate shutdown due to insufficient power
Solution Approach 1:
The patent performs a preliminary independent operation test before committing to full interconnected operation. During this test, the controller measures output power under current conditions (early morning or cloudy weather) to determine if sufficient power is available. This preliminary check enables the system to adapt to varying conditions while ensuring continuous operation by avoiding startup in insufficient conditions.
Solution Approach 2:
The patent implements feedback by measuring output power during the independent operation test and using this measurement to control the decision for full interconnected operation. The controller continuously monitors power output and uses this feedback to maintain reliable operation, shutting down only when necessary and restarting when conditions improve.
3Speed
If the grid interconnection relay is turned on and off frequently, then the apparatus responds quickly to changing power conditions, but it causes wear and operational instability
Solution Approach 1:
The patent reduces relay operation frequency by performing a preliminary independent operation test before full startup. The grid interconnection relay is activated only after the test confirms sufficient output power, and remains stable during continuous operation. This preliminary check mechanism reduces unnecessary relay switching while maintaining quick response to genuine power availability changes.
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 method ensures stable startup by confirming sufficient output power before transitioning to interconnected operation, preventing repeated startups and stops of the grid interconnection apparatus.
Implementation Method 1
a photovoltaic cell that receives sunlight to generate power
Data Source
AI summary
A startup control method of controlling startup of a PV PCS 150 configured to perform interconnected operation in which a PV 100 is interconnected to a grid 10 to supply power to a load 400: supplies power from independent operation output of the PV PCS 150 to a storage PCS 250 by an independent operation that does not interconnect the PV 100 to the grid 10 before starting the interconnected operation; measures the output power amount of the PV 100 or the PV PCS 150 when the power is supplied to the storage PCS 250; and stops the independent operation to start the interconnected operation when the measured output power amount is larger than a predetermined amount.