Slow start control method for high-power direct-current converter with high step-up ratio

Abstract

The invention relates to the technical field of direct-current step-up collection systems, and particularly relates to a slow start control method for a high-power direct-current converter with a highstep-up ratio. When a main inverter detects that the voltage of the DC side of the main inverter reaches a voltage value allowing the start, the main inverter / slave inverters starts / start to output voltage for open-loop slow start, then the main inverter enters a closed-loop operation state, then the slave inverter 1 enters a closed-loop slow start state, and the other slave inverters sequentially perform closed-loop slow start according to the closed-loop slow start mode of the slave inverter 1; and after the closed-loop slow start of all the slave inverters succeeds, the main inverter performs direct-current side voltage outer-loop slow start again, and the slow start is ended. According to the method, the impulse voltage and the impulse current appearing in the starting process of thehigh-power direct-current converter with a high step-up ratio can be restrained, a hardware circuit does not need to be added, safe and reliable starting of the high-power direct-current converter with a high step-up ratio is achieved, meanwhile, the electromagnetic compatibility of the converter is improved, the control is easy, and engineering implementation is easy.

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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