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Fault ride-through system

A fault ride-through, power system technology, applied in control systems, deceleration devices of AC motors, electromechanical devices, etc., can solve the problems of insufficient reduction, grid disconnection, rotor acceleration not synchronized with the grid, etc., to eliminate current spikes , the effect of reducing the voltage

Pending Publication Date: 2019-09-24
ROLLS ROYCE PLC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the large angle between the generator rotor and the grid generator can subject the generator to extremely high currents (current spikes), which can cause the generator to be damaged and disconnected from the grid
[0004] While the genset itself usually has an internal speed regulator that provides some internal capability to reduce the acceleration of the rotor during a fault condition, the regulator usually does not sufficiently reduce the acceleration of the rotor to prevent the genset from recovering to the pre-fault voltage becomes out of sync with the grid when level

Method used

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Embodiment Construction

[0039] refer to figure 1 , an electrical system 100 for supplying electrical power to an electrical grid 6 is provided. The power system is connected to the transmission lines 5 of the power grid 6 at the point of common coupling (PCC) 4, although in other arrangements the power system may be connected to the distribution lines of the power grid at the point of common coupling (PCC).

[0040] The power system 100 includes a reciprocating engine 1 driving a synchronous generator 3 . In particular, the engine 1 comprises a prime mover 2 configured to drive the rotor of a generator 3 relative to its stator windings to generate electrical energy. Engine 1 may be a gas turbine engine.

[0041] as in figure 1 As can be seen in , the generator 3 is connected to the PCC 4 via a fault ride-through system 10 operable to limit prime mover and rotor speed during fault conditions by effectively increasing the load at the output of the power system 100 . The fault ride-through system 10...

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Abstract

A fault ride through system for use in a power system is disclosed, wherein the power system includes a synchronous generator driven by a prime mover. The fault ride through system includes a mechanical switch connected in parallel with a dynamic power dissipater, wherein the dynamic power dissipater includes a solid state switch connected in series with a brake resistor. The controller is configured to control the mechanical switch and the solid state switch to control current through the brake resistor based on received data indicative of one or more operating parameters of the power system.

Description

technical field [0001] The present disclosure generally relates to a fault ride-through system, and in particular aims at enhancing the fault ride-through capability of a generating set operating in parallel with a power grid. Background technique [0002] Gensets, typically comprising a synchronous generator driven by a prime mover (eg of an engine or turbine) and a unit transformer, typically need to comply with stringent requirements for connection to the power grid. These requirements are usually defined by grid technical specifications issued by the responsible authority. Many grid specifications require connected generator sets to remain connected to the grid during periods of lower grid voltage, ie to "ride through" periods of low grid voltage. [0003] Periods of lower electrical network voltage are usually caused by faults on the far side of unit transformers in the grid. When a severe fault occurs in the power grid, the energy transfer to the system will be momen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02H7/06H02P9/006H02H3/02H02K7/1823H02P3/22H02P3/26H02P9/105
Inventor A.K.古普塔J.德姆哈特S.杨S.达斯古普塔M.克赖斯尔A.乌基尔
Owner ROLLS ROYCE PLC