Control system of pure water cooling device of high voltage direct current (HVDC) transmission converter valve

Abstract

The invention discloses a control system of a pure water cooling device of a high voltage direct current (HVDC) transmission converter valve, comprising two independent subsystems, wherein, each subsystem comprises a programmable logic controller (PLC), an input / output module, a sampling measurement system, a synchronization module, a human-machine interface system and a power supply system; the PLCs of the two subsystems can realize non-disturbance switching between the two PLCs and seamless exchange of information of each sub-control system through synchronous optical connection; the control system can monitor each online physical quantity in real time, and accurately control actions of machinery and electrical equipment of the whole valve cooling system in accordance with specific changes of the physical quantities, maximally ensure the reliability of the HVDC valve cooling system by a stable hot backup control subsystem, a control element and control programs, fully narrow the scope of accident, and prevent thyristor valve groups from being damaged due to the failure of the valve cooling system, thereby maintaining the safe, stable and reliable running of the thyristor valve groups.

Description

technical field [0001] The invention relates to a direct current transmission and distribution system, in particular to a direct current power system and a control system of a closed circulating pure water cooling device of a thyristor valve group in a power electronic device. Background technique [0002] The traditional power grid is connected by AC, which has the advantages of simple implementation, low investment, natural emergency emergency support for the other side of the grid when power is missing from one side of the grid, and quick response. However, it is precisely because of the natural "bundling" between the two networks after networking that the AC synchronization range is extended. When one of the power grids fails, it will affect multiple interconnected power grids, expand the consequences of the failure, reduce power quality, and easily cause contact The line power fluctuates greatly, even to the point of oscillating to break the weak links of the system, th...

AI Technical Summary

Problems solved by technology

However, because of the natural "bundling" between the two networks after networking, the AC synchronization range is extended. When one of the grids fails, it will affect multiple interconnected grids, which will expand the consequences of the failure, reduce the power quality, and easily cause contact. Large fluctuations in line power, or even shock to the weak link of the system, thereby increasing the probability of a major accident that destroys system stability, which will be catastrophic, which will affect the power grids on both sides of the AC network, other power grids that are synchronously connected with them, and The stability levels of the relevant tie lines cause varying degrees of mutual influence, which lowers the stability limit of the interconnected lines

Images