Photovoltaic series compensation system
A series compensation and photovoltaic technology, applied in the direction of photovoltaic power generation, AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problem of wasting switching tube voltage selection capacity, solve the problem of low voltage ride-through ability, and improve utilization rate Effect
Active Publication Date: 2017-09-29
SIEMENS AG
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Problems solved by technology
The voltage selection capacity of the switch tube is greatly wasted
Therefore, problems such as the output efficiency and utilization of solar cells have not been fundamentally solved at present.
Method used
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[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
[0039] figure 1 It is a circuit diagram of the photovoltaic series compensation system according to the first embodiment of the present invention. Such as figure 1As shown, the photovoltaic series compensation system includes positive terminal 1 and negative terminal 2 of the DC bus, capacitor C1, inverter 3, transformer U-phase Tr1, transformer V-phase Tr2, transformer W-phase Tr3, filter capacitor C2, filter capacitor C3 , a filter capacitor C4, an AC energy storage system 4 and an energy storage control device 42. The positive terminal 1 and the negative terminal 2 are used to connect the output terminals of the photovoltaic power generation device (not shown in the figure), and the two terminals of the capacitor C1 are resp...
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The invention provides a photovoltaic series compensation system. The system comprises a DC bus, a capacitor, an inverter, a transformer, a filter, an AC energy storing system and an energy storing control device; one end of the primary side of the transformer is electrically connected with the output end of the inverter; the filter is equipped with an input end which forms a continuous current circuit with the primary side of the transformer and the output end of the inverter, and an output end which is connected in parallel to a power grid; the AC energy storing system comprises an energy storing device and an energy storing conversion device; the energy storing control device is used for detecting voltage and current in the DC bus; when the voltage of the DC bus is more than a preset upper limit value or less than a preset lower limit value, the energy storing control device controls the energy storing conversion device to charge or discharge the energy storing device according to the voltage and current in the DC bus so as to provide dynamic compensation voltage to the output voltage of the inverter, and therefore, a photovoltaic generating device can work at the maximum power point. With the adoption of the photovoltaic series compensation system, the maximum power point range can be expanded, and meanwhile, the grid voltage compensation and energy storage functions can be achieved.
Description
technical field [0001] The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic series compensation system. Background technique [0002] In a solar grid-connected power generation system, how to increase the output power of solar cells, make full use of solar energy, and improve the power generation efficiency of the entire solar grid-connected power generation system is of great significance. [0003] Through the research on the output power characteristics of solar cells, it is found that the output power of solar cells is related to parameters such as light intensity and ambient temperature. In order to make the photovoltaic grid-connected power generation system work near the maximum output power point, more maximum power point tracking ( MPPT), by changing the output voltage of the solar cell, so as to achieve the maximum power output of the solar cell. [0004] A photovoltaic inverter and a control method are disclosed in t...
Claims
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IPC IPC(8): H02J3/28H02J3/38
CPCH02J3/28H02J3/385Y02E10/56Y02E70/30
Inventor 马琳
Owner SIEMENS AG