Wind power flexible direct current delivery system with distributed direct current energy consumption device

Abstract

The invention discloses a wind power flexible direct current delivery system with a distributed direct current energy consumption device; the wind power flexible direct current delivery system comprises a plurality of offshore wind power plants which are arranged in parallel, wherein electric energy sent out by the offshore wind power plants is fed into an alternating-current power grid through atransmitting end converter station and a receiving end converter station; the distributed direct current energy consumption device is integrated inside the transmitting-end converter station or the receiving-end converter station; when the wind power flexible direct current delivery system suffers from a receiving-end alternating-current fault, the voltage of the direct-current side system rises,a certain number of energy consumption resistors are input for consuming the surplus power, and the short-time stability of the system is maintained; and after the fault is recovered, the corresponding energy consumption resistors are removed, and the fault ride through of the system is completed. According to the system, the energy consumption components are averagely distributed into a large quantum module, so that accurate matching of surplus power can be realized, the fluctuation of the electric quantity in the switching process of the energy consumption device is greatly reduced, fault outage of the system is avoided, and fault ride-through is realized.

Description

technical field [0001] The invention belongs to the field of direct current transmission and distribution, and is a wind power flexible direct current transmission system with distributed direct current energy consumption devices. Background technique [0002] Compared with the conventional DC transmission system, the flexible DC transmission system can realize the power flow reversal by reversing the current direction without changing the voltage polarity. The flexible DC transmission and flexible DC grid system with high reliability, the most significant The feature is that it can realize multi-power supply and multi-drop power receiving, and provide a more flexible and fast power transmission method for the power system. [0003] Large-capacity, long-distance wind farms, photovoltaic power stations and other new energy power generation systems are suitable for energy transmission through flexible DC transmission. They have many advantages such as system stability, flexibl...

AI Technical Summary

Problems solved by technology

However, the above solutions will cause large power fluctuations during the switching of energy-consuming devices, which will easily cause overvoltage and overcurrent faults, which will have a certain impact on equipment safety and system stability.

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