A photovoltaic inverter, photovoltaic system and discharge control method
A photovoltaic inverter and inverter circuit technology, applied in photovoltaic power generation, photovoltaic modules, control/regulation systems, etc., can solve the problems of large discharge resistance discharge power, large discharge circuit volume, and increased inverter volume, etc., to achieve The effect of reducing volume
Active Publication Date: 2022-07-12
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0004] However, the existing technical solution is to directly discharge the DC bus capacitor. Since the capacitance of the DC bus capacitor is usually relatively large, in order to achieve the requirement of reducing it to less than 30V within 30s, the added passive discharge circuit usually adopts a relatively small resistance value. At this time, the discharge power of the discharge resistor is relatively large, resulting in a large volume of the discharge circuit, which will increase the volume of the inverter, thereby increasing the cost of the photovoltaic system
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[0080] In order to enable those skilled in the art to better implement the technical solutions of the present application, technical terms are first introduced below.
[0081] The photovoltaic inverter provided in this application includes a DCDC converter and an inverter circuit, wherein the DCDC converter can be a boost converter, a buck converter, or a buck-boost converter, which is not described in this application. Specific restrictions. For example, when the DCDC converter is a boost converter, it can be a Boost circuit.
[0082] The X capacitor and the Y capacitor are safety capacitors, which are technical terms in the field. Generally, the X capacitor is connected between the two lines of the power line (L-N), and metal film capacitors are generally used; the Y capacitor is connected across the two lines of the power line. The capacitance between the ground (L-E, N-E) is generally paired. The X capacitor is used to suppress differential mode interference, and the Y c...
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The present application discloses a photovoltaic inverter, a photovoltaic system and a discharge control method, which are used to discharge the port capacitor whose capacitance is much smaller than the DC bus capacitor when the photovoltaic inverter performs a rapid shutdown, thereby reducing the power consumption. Discharge circuit volume. The photovoltaic inverter provided in this application includes: a first DCDC converter, an inverter circuit, a first discharge circuit and a controller. A port capacitor is connected between the positive input end and the negative input end of the first DCDC converter, and the port capacitor includes an X capacitor and a first group of Y capacitors; the first discharge circuit is connected between the midpoint of the first group of Y capacitors and the DC bus. The midpoint of the first group of Y capacitors is grounded; the controller is used to control the first discharge circuit to work when receiving a quick turn-off command, so that the first discharge circuit discharges the power of the port capacitors.
Description
technical field [0001] The present application relates to the technical field of photovoltaic power generation, and in particular, to a photovoltaic inverter, a photovoltaic system and a discharge control method. Background technique [0002] In photovoltaic systems, there are sometimes situations that require a quick shutdown of the system. Some chapters of the fast shutdown system in the standard UL1741-2018 stipulate that in order to ensure the safety of maintenance personnel, when the fast shutdown system triggers fast shutdown, it is required that any DC input conductors of the grid-connected inverter should be connected to the ground between any DC input conductors. The voltage drops to within 30V within 30s. [0003] In order to meet the above requirements, the prior art solution adopts an additional passive discharge circuit at the DC bus. The specific implementation method is to first actively discharge the DC bus capacitor through the auxiliary power supply or th...
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IPC IPC(8): H02M1/32H02M3/155H02M7/48H02J3/38
CPCH02M1/32H02M3/155H02M7/48H02J3/381H02J2300/24H02M1/322Y02E10/56H02J3/38H02S40/32H02M1/007
Inventor王新宇姜安营丁顺俞雁飞李晓迅
OwnerSUNGROW POWER SUPPLY CO LTD