Hybrid inverter with uninterruptible power supply function
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A hybrid inverter, bidirectional inverter technology, applied in emergency power supply arrangements, electrical components, circuit devices, etc., can solve problems such as power grid impact, and achieve the effect of fast response time
Inactive Publication Date: 2014-03-26
SHENZHEN KSTAR NEW ENERGY CO LTD
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Due to the intermittent and random nature of solar power generation, it will have a certain impact on the power grid
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specific Embodiment approach 1
[0031] In the present invention, an energy storage unit, a bidirectional converter, a bidirectional inverter, a switch network composed of K1, K2, and K3 and a corresponding controller are introduced into the grid-connected inverter, and the controller can control the switches K1, K2, Each unit of K3 and hybrid inverter is shown in Fig.3.
[0032] By controlling each converter, the controller controls the input of photovoltaic energy, the charging and discharging of energy storage units, the input and output of grid energy, maintains busbar balance and tracks load power changes. And detect the state of the converter, bidirectional converter, and bidirectional inverter in the figure, as well as the voltage and current of the power grid (between switch K and the power grid), and judge whether the power grid and the inverter are normal.
[0033] When the controller judges that the power grid is normal and the inverter is normal, the controller makes K1, K2, and K3 close through c...
specific Embodiment approach 2
[0038] The present invention introduces an energy storage unit, a bidirectional converter, a bidirectional inverter, a switch network composed of K1, K2, K3 and K4, a corresponding controller, and a generator into the grid-connected inverter. The controller can control the switches K1, K2, K3, K4 and each unit of the hybrid inverter, as well as the start and stop of the generator, such as figure 2 shown.
[0039] By controlling each converter, the controller controls the input of photovoltaic energy, the charging and discharging of energy storage units, the input and output of grid energy, maintains busbar balance and tracks load power changes. And detect the state of the converter, bidirectional converter, and bidirectional inverter in the figure, as well as the voltage and current of the power grid (between switch K and the power grid), and judge whether the power grid and the inverter are normal.
[0040] When the controller judges that the power grid is normal and the in...
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Abstract
The invention provides a hybrid inverter with the uninterruptible power supply function. The hybrid inverter with the uninterruptible power supply function comprises a transducer, a bidirectional transducer, a bus, a bidirectional inverter, a controller, a first switch, a second switch and a third switch. One end of the first switch, one end of the second switch and one end of the third switch are connected, a first port is led out from the other end of the first switch, a second port is led out from the other end of the second switch, a third port is led out from the other end of the third switch, the first port is connected with alternating-current output of a hybrid inverter body, and the second port and the third port are used for being connected with a power grid and a load respectively; one end of the transducer is connected to a new energy power generation unit, the other end of the transducer is connected with the bus, one end of the bidirectional transducer is connected to an energy storage unit, the other end of the bidirectional transducer is connected to the bus, one end of the bidirectional inverter is connected with the bus, and the other end of the bidirectional inverter is connected with the first port. When one of the power grid and the inverter breaks down, only one switch is needed for operation and the responding speed is high.
Description
technical field [0001] The invention relates to an inverter, in particular to a hybrid inverter with an uninterruptible power supply function. Background technique [0002] Traditional grid-connected inverters can only realize photovoltaic power grid-connected. When the grid is disconnected due to faults, it can only shut down and cannot provide off-grid power supply, let alone meet the uninterrupted power supply requirements of UPS (Uninterrupted Power Supply) for important loads. [0003] At present, solar power generation has been applied on a large scale, and the proportion of solar power generation in the grid is also increasing day by day. Due to the intermittent and random nature of solar power generation, it will have a certain impact on the power grid. In Europe, where solar energy is vigorously developed, the maximum power of solar energy grid-connected has begun to be limited, and with the reduction of solar power generation costs, the price of photovoltaic subsi...
Claims
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