Pre-synchronization starting control strategy of photovoltaic network-forming converter

By designing the pre-synchronous start-up control strategy of photovoltaic grid-type converter, the problem of lack of effective power regulation during grid-connected start-up of photovoltaic grid-type inverter is solved, and the stability of the DC bus voltage and the safe operation of the power grid are achieved.

CN119853160APending Publication Date: 2025-04-18HEBEI UNIV OF TECH
0 Cites 2 Cited by

Patent Information

Application Number
CN202411866889.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-04-18

AI Technical Summary

Technical Problem

The existing photovoltaic grid inverters lack effective power regulation capabilities when they are started in the grid, resulting in large fluctuations in the DC bus voltage, affecting the stability of the power grid, and the existence of energy storage batteries increases operating costs and brings safety hazards.

Method used

A pre-synchronous start-up control strategy for photovoltaic grid-type converters is designed, including establishing a mathematical model of a photovoltaic virtual synchronous generator, designing a pre-synchronous slow start-up control strategy, and controlling the stable DC bus voltage based on slip mode.

Benefits of technology

Through the pre-synchronous start-up control strategy, the photovoltaic array can reserve power before being connected to the grid, avoid DC bus voltage collapse, improve system robustness and grid stability, and reduce operating costs.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention belongs to the technical field of photovoltaic network construction, and discloses a pre-synchronization start control strategy of a photovoltaic network construction type converter. According to the method, an energy balance relation between a photovoltaic array and output power of an inverter of a virtual synchronous machine (VSG) is used for replacing charging and discharging of an energy storage battery on a system, and a photovoltaic virtual synchronous machine (PV-VSG) pre-synchronization slow start control strategy is designed. The strategy can enable the photovoltaic inverter to have the capability of independently supporting the bus voltage and frequency, and can avoid the grid connection failure caused by the destructive influence of the system power shortage caused by external disturbance on the DC bus voltage at the starting moment of the energy-storage-free photovoltaic grid connection system. According to the strategy, PV-VSG network construction control in a power reserve mode is considered, and smooth grid connection of the photovoltaic on-load system is realized. In the step of stabilizing the voltage of the direct current bus, sliding mode control is adopted to replace traditional PI control, and the robustness of a network construction system is improved.
Need to check novelty before this filing date? Find Prior Art