Parallel Power Converter Control Without a Common Controller
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Solution Overview
Problem
The existing power conversion system requires a common control device for multiple power converters connected in parallel, making the system complex and inefficient.
Innovation Solution
A control device that includes a voltage recognizing unit and a control unit to manage the amplitude and frequency of voltage output by power converters, allowing them to operate autonomously or as current sources to compensate for active and reactive power imbalances at the linkage point, eliminating the need for a common control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common control device is used for multiple power converters connected in parallel, then the power converters can be operated with coordinated control, but the system becomes complicated and requires additional control infrastructure
Solution Approach 1:
Each power converter is equipped with autonomous control capability that allows it to independently detect voltage at the linkage point and adjust its own output characteristics. The converters self-regulate their active and reactive power output based on local voltage measurements, eliminating the need for external coordinated control while maintaining system reliability
Solution Approach 2:
The centralized control function is divided and distributed to individual power converters. Each converter becomes an independent control unit that autonomously manages its output based on voltage detection, transforming a monolithic control system into modular autonomous units that simplify overall system architecture
2Device complexity
If each power converter operates autonomously without a common control device, then the system becomes simpler, but coordinated power supply control becomes difficult
Solution Approach 1:
Each power converter continuously detects the voltage at the linkage point and uses this feedback information to autonomously adjust its output. The voltage detection result serves as feedback that enables each converter to coordinate its power output with the overall system requirements, achieving coordinated control through decentralized feedback mechanisms
Solution Approach 2:
Multiple autonomous power converters are merged at the linkage point where they collectively supply power to the load. Their individual autonomous operations combine to achieve coordinated system-level performance, with voltage detection at the common linkage point enabling implicit coordination among all connected converters
Data Source
AI summary
A control device for a power conversion device includes a voltage recognizing unit configured to detect a voltage at a linkage point of the plurality of power converters, and a control unit configured to control an amplitude and a frequency of a voltage to be output by a power converter to be controlled on the basis of active power and reactive power output by the power converter to be controlled in a case that the power converter to be controlled is caused to perform autonomous operation as a voltage source, and controls active power and reactive power to be output by the power converter to be controlled so as to compensate for excess or deficiency of active power and reactive power at the linkage point on a basis of an amplitude and a frequency of the voltage detected by the voltage recognizing unit.