A photovoltaic high voltage DC series grid-connected system including a voltage dynamic compensator
A dynamic compensation, high-voltage direct current technology, applied in photovoltaic power generation, AC network voltage adjustment, electrical components, etc., can solve problems such as complex control, low reliability, and introduction of high voltage into low-voltage systems, so as to increase system power generation and improve power generation efficiency , the effect of simplifying the design
Active Publication Date: 2018-12-07
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
[0012] The purpose of the present invention is to overcome the disadvantages of complex control, low reliability, and easy introduction of high voltage to the low-voltage system of the photovoltaic HVDC power transmission system outputting series topology in the prior art, and propose a photovoltaic HVDC series grid-connected system containing a voltage dynamic compensator system
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[0036] The topology and control method of the photovoltaic high-voltage DC series grid-connected system including the voltage dynamic compensator will be described below with reference to the accompanying drawings and specific embodiments.
[0037] figure 1 It is a system structure topology diagram of the present invention. Such as figure 1 As shown, the photovoltaic HVDC series grid-connected system includes the first photovoltaic DC grid-connected converter 101, the second photovoltaic DC grid-connected converter 102, the n-1th photovoltaic DC grid-connected converter 103, the nth photovoltaic A DC grid-connected converter 104 , at least one voltage dynamic compensator 105 , and an energy storage system 110 . The input ends of the first photovoltaic DC grid-connected converter 101, the second photovoltaic DC grid-connected converter 102, the n-1th photovoltaic DC grid-connected converter 103 and the nth photovoltaic DC grid-connected converter 104 are respectively and The...
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The invention provides a photovoltaic high-voltage and direct-current series grid-connected system comprising a dynamic voltage compensator. The photovoltaic high-voltage and direct-current series grid-connected system comprises a plurality of photovoltaic direct-current grid-connected inverters and at least one dynamic voltage compensator, wherein input ends of the plurality of photovoltaic direct-current grid-connected inverters are independent and output ends are connected in series; the input ends of the plurality of photovoltaic direct-current grid-connected inverters are connected with a photovoltaic module respectively; and the output ends of the plurality of photovoltaic direct-current grid-connected inverters are connected in series and are connected with the input end of the dynamic voltage compensator in series. Through coordination and cooperation of the dynamic voltage compensator and the photovoltaic direct-current grid-connected inverters, the probability that the photovoltaic direct-current grid-connected inverters enter a power limiting mode; the generating capacity of the photovoltaic system is improved; and output voltage exceeding of the photovoltaic direct-current grid-connected inverters caused by power fluctuation of the photovoltaic module is overcome.
Description
technical field [0001] The invention relates to photovoltaic power generation equipment, in particular to a photovoltaic grid-connected device connected to a high-voltage direct current transmission system. Background technique [0002] The use of renewable energy to generate electricity to replace fossil energy is a common choice for all countries. Photovoltaic power generation, as an important form of renewable energy power generation, has attracted more and more attention due to its characteristics of cleanliness, environmental protection and flexible utilization, and its installed capacity has developed rapidly in China. During the national "Twelfth Five-Year Plan" and the "Thirteenth Five-Year Plan", great attention has been paid to it. [0003] Since the late 1990s, foreign companies have conducted research on light direct current transmission technology, which uses voltage source converters that can turn off devices to replace current source converters in traditional...
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IPC IPC(8): H02J3/38H02J3/12
CPCH02J3/12H02J3/383Y02E10/56
Inventor 鞠昌斌王一波王环刘润彪
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI