Inverter and its control method
A technology of inverters and control units, which is applied in the field of energy storage inverters and photovoltaic inverters, and can solve problems such as tripping of the front-end switch protection of the power grid, damage to the static switch of the contactor, and impact of the grid inverter, so as to protect the power grid Safe, convenient interactive use, smooth switching effect
Active Publication Date: 2016-03-16
SHENZHEN WINLINE TECH
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Problems solved by technology
This will inevitably cause an impact on the power grid or the inverter, which may cause the front-end switch protection trip of the power grid, or the overcurrent shutdown of the inverter, damage to the contactor or static switch, etc., affecting the safety of the power grid
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0031] See figure 1 , the inverter 1 of the present invention mainly includes: an inverter body 10, a remote contactor 12 arranged between the output end of the inverter body 10 and the power grid, and an inverter arranged at the output end of the inverter body 10 The output voltage sampler 14 of the device, and the grid voltage sampler 16 arranged at the grid end.
[0032] One end of the inverter 1 of the present invention is connected to an energy storage battery 30 (such as a solar cell array) as a local energy storage device, and the other end is connected to a local load 50, which facilitates off-grid operation of the inverter 1 of the present invention. At the same time, the end connected to the local load 50 is also connected to the power grid 40 through the remote contactor 12 .
[0033] The inverter body 10 includes an inverter power unit 100...
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The invention discloses an inverter which comprises an inverter body, a remote contactor, an inverter output voltage sampler and a power grid voltage sampler. The inverter body comprises an inverter power unit and an inverter control unit, the remote contactor is arranged between an output end of the inverter body and a load or a power grid, the inverter output voltage sampler is arranged at the output end of the inverter body, and the power grid voltage sampler is arranged at a power grid end. The inverter control unit transmits grid-disconnection or grid-connection instructions to the inverter power unit and is further used for controlling connection or disconnection of the remote contactor between a distributed power generation system and the power grid. The inverter has the advantages that an independent operation mode or a grid-connection operation mode can be implemented, the two working modes can be switched over smoothly, the inverter brings convenience for interactively utilizing a distributed renewable energy source and the power grid, impact on the power grid is prevented, and the safety of the power grid is protected.
Description
technical field [0001] The invention relates to an energy storage inverter and a photovoltaic inverter, and provides a dual-mode control method for the inverter, which can realize the independent or grid-connected operation of the inverter and the smooth switching between the two working modes , to facilitate the interactive use of distributed renewable energy and power grids, and provide technical support for the development of smart microgrids. Background technique [0002] Distributed power generation usually refers to a power generation system that utilizes distributed resources, has a small installed capacity, and is arranged near users. It is generally connected to a power grid with a voltage level of less than 35 kV or lower. Distributed power generation systems include distributed photovoltaic power generation, distributed energy storage, distributed wind energy, diesel generators and other power generation systems, and have the concept of smart microgrids. [0003]...
Claims
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IPC IPC(8): H02J3/38
Inventor 朱建国廖荣辉曾炳光沙旻
Owner SHENZHEN WINLINE TECH