Distributed subsynchronous oscillation suppression device and new energy power transmission system

Abstract

The invention provides a distributed subsynchronous oscillation suppression device and a new energy power transmission system. The distributed subsynchronous oscillation suppression device is arrangedon a power transmission line between an outgoing line end of a distributed new energy electric field and a convergence bus and comprises signal acquisition equipment, a subsynchronous oscillation suppression equipment and a transformer, wherein the signal acquisition equipment is connected with the power transmission line and is used for acquiring a subsynchronous oscillation signal of the distributed subsynchronous new energy electric field, the subsynchronous oscillation suppression equipment is connected with the signal acquisition device and is used for outputting a subsynchronous oscillation impedance signal according to the subsynchronous oscillation signal, and the transformer is connected with the subsynchronous oscillation suppression equipment, is arranged in series on the powertransmission line and is used for injecting a subsynchronous oscillation impedance voltage to the power transmission line according to the subsynchronous oscillation signal. By the distributed subsynchronous oscillation suppression device, subsynchronous suppression can be targetedly performed on each new energy electric field, the subsynchronous oscillation signal which cannot be suppressed canbe greatly reduced, so that a better suppression effect is achieved.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to a distributed subsynchronous oscillation suppression device and a new energy transmission system. Background technique [0002] Based on the rapid development of new energy power generation, China has become the country with the largest wind power grid-connected capacity and the fastest development of photovoltaics. However, with the large-scale integration of wind power and other new energy sources, in addition to the accompanying huge economic benefits, it also brings new problems to the safe and stable operation of the power system. Obvious subsynchronous oscillations have been found in many wind power bases in Northwest my country, North China, and Northeast China. Subsynchronous oscillation has become an important issue facing the safe and efficient operation of large-scale new energy in my country. [0003] At present, typical subsynchronous oscillation suppression ...

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Problems solved by technology

[0004] However, due to the existing subsynchronous oscillation suppression devices for new energy sources, they are often concentrated and fixed on the power supply side or in the transmission line to suppress the subsynchronous oscillations of all lines in a centralized manner. The difference is that the situation of subsynchronous oscillation caused by distributed new energy grid connection is more complicated. The existing subsynchronous oscillation suppression technology is used to suppress the subsynchronous oscillation after the distributed new energy electric field is connected to the grid, and the grid connection line needs to be considered. In the case where the sub-synchronous suppression signal on the network is distributed to each new energy electric field, since the amplitude and frequency of the sub-synchronous oscillation generated by different new energy electric fields may be different, after grid connection, the sub-synchronous oscillation will be extremely complicated. The method of centralized suppression after the collection of multiple lines may cause many times of synchronous oscillation signals to be unable to be suppressed, resulting in unsatisfactory suppression effect

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