DC-DC Converter Ripple Compensation for Solar Energy Storage
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Solution Overview
Problem
Solar power generation systems face challenges with ripple generation in DC links when connected to a grid, particularly due to night-time and weather-related power gaps, which affect stability and efficiency.
Innovation Solution
A DC-DC converter with a processor-controlled converting circuit that compensates for ripple by obtaining and applying control signals through phase conversion, synchronous conversion, and pulse width modulation (PWM) to manage frequency and power distribution between solar power and battery storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-phase inverter is connected to the grid, then power can be supplied to the grid, but ripple occurs in the DC link
Solution Approach 1:
A DC-DC converter is introduced as an intermediary component between the single-phase inverter and the DC link. This converter acts as a mediator that decouples the ripple propagation path while maintaining power transfer functionality. The converter includes switching elements and control circuitry that actively manage the DC link voltage to prevent ripple transmission to the grid-side inverter.
Solution Approach 2:
The system dynamically adjusts operating parameters of the DC-DC converter based on detected ripple characteristics. The control circuitry monitors DC link voltage and current, identifies ripple frequency and amplitude, and modifies switching duty cycles and timing to counteract ripple effects. This parameter adaptation allows the system to maintain stable operation under varying grid conditions.
2Reliability
If battery storage is added to compensate for power generation gaps, then power supply stability is improved, but system complexity increases
Solution Approach 1:
The DC-DC converter is designed to perform multiple functions within a single integrated circuit. It simultaneously provides ripple compensation, battery charge/discharge management, and DC link voltage regulation. By combining these functions in one converter rather than using separate circuits for each function, the system achieves improved reliability without proportionally increasing complexity.
Solution Approach 2:
The control circuitry of the DC-DC converter is merged with the inverter control system, allowing shared processing resources and coordinated operation. The battery management functions are integrated into the same control architecture that manages the DC link, reducing the need for separate control circuits and simplifying the overall system structure while maintaining stable power supply.
Data Source
AI summary
According to an embodiment, disclosed are a DC-DC converter for compensating for a ripple, in a solar linked energy storage system, and a control method thereof. In particular, disclosed is a DC-DC converter for compensating for a ripple generated in a DC link where a single phase inverter and a converter are connected. The DC-DC converter may obtain a frequency of a grid to compensate for the ripple.