Power Inverter Pre-Energization Testing Before Grid Connection
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Solution Overview
Problem
In distributed-power-supply power conversion systems, the energization test of power inverters is delayed due to the need for lengthy preparation of power receiving facilities, causing a delay in starting power sales.
Innovation Solution
A distributed-power-supply power conversion system that allows for the energization test of power inverters before the system receives power by disconnecting the AC side of the inverter from the system and connecting it to an AC power supply device and load bank, enabling testing without requiring the system to be powered up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energization test is performed after the system receives power, then the test can be conducted in the actual operating environment, but the start of power sales is delayed due to lengthy preparation of power receiving facilities
Solution Approach 1:
The patent applies preliminary action by performing the energization test before the system receives power from the grid. The power inverter is tested in advance using a power supply device and load bank, so that when the system is ready to receive power, the inverter is already validated and can immediately start operating, eliminating the delay caused by waiting for grid power availability for testing
Solution Approach 2:
The patent introduces intermediary devices (power supply device and load bank) that temporarily replace the grid power during the testing phase. These intermediary devices enable the inverter to be tested in isolation without requiring the actual power receiving facilities to be ready, thus decoupling the test execution from grid availability
2Loss of time
If the AC side of the power inverter is disconnected from the system and connected to power supply device and load bank for testing, then the energization test can be performed before receiving power, but the system configuration becomes more complex
Solution Approach 1:
The power inverter is designed with multi-functionality to operate in different modes: it can connect to the grid for normal operation or disconnect and connect to the power supply device and load bank for testing. This universal design allows the same hardware to serve multiple purposes without requiring separate dedicated test equipment permanently installed
Solution Approach 2:
The system employs dynamic switching capabilities that allow the AC side of the inverter to be reconfigured between different connection states (grid-connected or test-connected). This dynamic reconfigurability enables the system to adapt its topology based on operational mode, reducing permanent structural complexity while maintaining testing capability
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
Enables the energization test of power inverters to be performed before the system receives power, facilitating earlier start-up and reducing delays in power sales.
Implementation Method 1
a plurality of power inverters configured to invert DC power to AC power
Data Source
AI summary
A distributed-power-supply power conversion system includes a plurality of power inverters configured to invert DC power to AC power; and a control device configured to select at least one power inverter from the plurality of power inverters as a power inverter used for testing, and configured to perform an energization test of the power inverter used for testing in a state where an AC side of the power inverter used for testing is disconnected from a system, and is connected to an AC power supply device and to a load bank, and a voltage on the AC side of the power inverter used for testing is established. The distributed-power-supply power conversion system can perform an energization test of a power inverter before a system receives power.