Slow start control method for high power and high step-up ratio DC converter

Abstract

The invention relates to the technical field of direct current boosting collection systems, in particular to a slow start control method for a high power and high boost ratio direct current converter. When the main inverter detects that its own DC side voltage reaches the voltage value allowed to start, the main inverter / slave inverter starts to output voltage open-loop slow start, and then the main inverter enters the closed-loop operation state, and then the slave inverter 1 Entering the closed-loop slow start state, other slave inverters perform closed-loop slow start sequentially according to the closed-loop slow start mode of slave inverter 1. After all the slave inverters are successfully closed-loop and slow-started, the master inverter will perform the DC-side voltage outer-loop slow-start, and the slow-start is over. The present invention can suppress the surge voltage and surge current that appear during the start-up process of the high-power high-boost ratio DC converter, without adding hardware circuits, and realizes the safe and reliable start-up of the high-power high-boost ratio DC converter, and at the same time improves the The electromagnetic compatibility of the converter, and the control is simple, which is easy to realize in engineering.

Description

technical field [0001] The invention relates to the technical field of direct current boosting collection systems, in particular to a slow start control method for a high power and high boost ratio direct current converter. Background technique [0002] In order to solve the problem of energy shortage, the scale of solar energy development and utilization has been rapidly expanded, technological progress and industrial upgrading have been accelerated, and costs have been significantly reduced. It has become an important field of global energy transformation. As of the end of 2019, the cumulative installed capacity of photovoltaic power generation in the country reached 204.3 million kilowatts. The national key research and development plan project guidelines have included the construction of large-scale renewable energy power generation bases of 10 million kilowatts as a specific goal, and more than two-thirds of large-scale photovoltaic power plants will be intensively deve...

AI Technical Summary

Problems solved by technology

[0009] (1) High power and high step-up ratio DC converters have large power, high current and high voltage. During the start-up process, there will be a large impact voltage and current, which will easily cause damage to the converter and safety accidents. It must be Suppress it with a slow start method

[0010] (2) For high-power and high-boost ratio DC converters, the main research points at home and abroad are all focused on the research on its topology, and the slow start of the DC converters in this multi-machine parallel system is specific The control method is not described in the literature

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