Sungrow Power Supply has filed a patent for a photovoltaic grid-connected system and a control method. The system includes a synchronous motor back-to-back drive system that improves stability and safety of the power grid and reduces the impact of intermittent new energy. The control method ensures voltage stability of the photovoltaic inverter’s AC side. Traditional photovoltaic inverters can be used without modification. GlobalData’s report on Sungrow Power Supply gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Sungrow Power Supply, Smart energy mgmt systems was a key innovation area identified from patents. Sungrow Power Supply's grant share as of September 2023 was 65%. Grant share is based on the ratio of number of grants to total number of patents.
The patent filed is for a control method for a photovoltaic grid-connected system
A recently filed patent (Publication Number: US20230318298A1) describes a control method for a photovoltaic grid-connected system. The system includes a photovoltaic array, a photovoltaic inverter, a synchronous motor back-to-back drive system, and a transformer connected in series. The control method involves several steps to ensure efficient operation of the system.
The first claim of the patent describes the control method, which includes operating the photovoltaic inverter in a current source mode and the synchronous motor back-to-back drive system in a generator mode. Additionally, the excitation current of the first synchronous motor is controlled to maintain voltage stability on the alternating current side of the photovoltaic inverter.
The second claim specifies that the photovoltaic inverter operates in a maximum power point tracking (MPPT) current source control mode. This mode allows the inverter to optimize power generation by tracking the maximum power point of the photovoltaic array.
The third claim further explains that when an active power dispatching command is received and the active power command value is less than the maximum power of the photovoltaic array, the photovoltaic inverter operates in the current source mode according to the active power command value.
The fourth claim states that when operating the synchronous motor back-to-back drive system in the generator mode, the excitation current of the second synchronous motor is controlled to achieve a corresponding power factor according to a reactive power command value.
The fifth claim mentions that the control method includes operating the synchronous motor back-to-back drive system in a synchronous condenser mode when the stator winding of the first synchronous motor has no input power.
The sixth claim introduces additional components of the photovoltaic grid-connected system, including a black start system, first, second, and third switches. These components are used to start the system and ensure proper operation.
The seventh claim provides a detailed explanation of how the black start system, first, second, and third switches are controlled to start the photovoltaic grid-connected system.
The eighth claim describes the process of shutting down the photovoltaic inverter and cutting off the input power to the stator winding of the first synchronous motor.
The patent also includes a description of the photovoltaic grid-connected system itself, which consists of a photovoltaic array, at least one photovoltaic inverter, a synchronous motor back-to-back drive system, a transformer, and a control system. The control system executes the control method described in the patent to ensure efficient operation of the system.
Overall, this patent describes a control method and system for a photovoltaic grid-connected system that aims to optimize power generation and maintain voltage stability.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
