Power Supply System Harmonic Resonance Control
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Solution Overview
Problem
In power supply systems with multiple power conversion devices connected in parallel, harmonic components can resonate and amplify due to the number of devices in a standby state, leading to potential power conversion device stoppages.
Innovation Solution
A power supply system with multiple power conversion devices, breakers, and a controller that controls the breakers to switch between ON and OFF states, determining when the number of power conversion devices in a standby state reaches a predetermined number, thereby controlling the connection states to suppress harmonic resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power conversion devices are connected in parallel to increase output capacity, then the power supply capability is improved, but harmonic resonance occurs when a predetermined number of devices are in standby state
Solution Approach 1:
The invention changes the operational state parameters of power conversion devices by controlling the breaker states. When the number of standby devices reaches a predetermined threshold, the controller changes the parameter (breaker state) from ON to OFF, thereby altering the system's electrical characteristics and avoiding harmonic resonance while maintaining adequate power supply capability.
Solution Approach 2:
The controller continuously monitors the number of power conversion devices in standby state and provides feedback control. When the standby count reaches a critical threshold, the controller activates feedback control to switch breakers, thereby dynamically adjusting the system configuration to prevent harmonic resonance while maintaining optimal power supply capability.
2Speed
If power conversion devices are kept in standby state to respond to sudden output increases, then the response speed is improved, but harmonic resonance is triggered
Solution Approach 1:
The invention introduces dynamic control of breaker states based on real-time monitoring of standby device counts. The system dynamically adjusts the configuration of power conversion devices by switching breakers ON/OFF, creating a flexible system that can respond to sudden output increases while avoiding the fixed configuration that causes harmonic resonance.
Solution Approach 2:
The controller performs preliminary action by monitoring the standby state count and proactively switching breakers before harmonic resonance occurs. This preventive control ensures that the system maintains response capability while avoiding the harmful resonance condition that would occur with a fixed number of standby devices.
3Stability of the object's composition
If breakers are controlled to switch connection states to suppress harmonic resonance, then the stability is improved, but the device complexity increases
Solution Approach 1:
The controller performs multiple functions: it monitors the operational states of power conversion devices, counts standby devices, determines when resonance conditions exist, and controls breaker switching. This multi-functionality consolidates complex control logic into a single control device, improving system stability while managing complexity through functional integration.
Solution Approach 2:
The control system operates autonomously by self-monitoring the standby state of power conversion devices and automatically controlling breaker switching without external intervention. This self-service capability maintains system stability through automated resonance prevention while minimizing the complexity of external control infrastructure.
Data Source
AI summary
A power supply system includes a plurality of power conversion devices, a plurality of breakers, and a controller. The plurality of breakers are respectively connected to the plurality of power conversion devices and configured to perform switching of an electrical connection between the power conversion device and a power system, wherein the breaker switches an ON state and an OFF state. The controller is configured to control the breakers and switch connection states of the plurality of power conversion devices are switched, and the controller being configured to determine whether or not the connected breaker is in an ON state and electrically conducted to the power system and the number of the power conversion devices in a standby state reaches a predetermined number.