Disclosed herein are a surge prevention apparatus and method for a centrifugal compressor. The surge prevention apparatus includes a control unit for controlling a gas provision operation based on a flow rate and pressure on an inlet side of a compressor and pressure on an outlet side of the compressor, and a gas provision unit for storing a part of gas flowing into the inlet side of the compressor and providing the stored gas to the inlet side in response to a control signal from the control unit.

An engine system incorporating an intake manifold, a compressor, and a controller. The compressor may provide air to the intake manifold and the controller may be connected to the intake manifold and the compressor. The controller may receive a control signal and control air flow from the compressor to the intake manifold based on the received control signal. The controller may control the air flow from the compressor to the intake manifold based on a first equation when a value related to the control signal is on a first side of a threshold and according to a second equation when the value is on a second side of the threshold. The controller may control the air flow between the compressor and intake manifold according to the second equation to prevent the compressor from operating at a surge condition when controlling the air flow according to the first equation.

The present invention relates to a compressor device (1) comprising: a compressor installation (2) having at least one compressor element (3a, 3b, 3c) for compressing a suctioned gas,
the compressor element (3a, 3b, 3c) being driven by an electric motor (4); a heat recuperation system (6) for recuperating heat from a compressed gas resulting from the compression of the suctioned gas,
the heat recuperation system (6) comprising a piping network (7) having an inlet (8) and an outlet (9) for a coolant, said piping network (7) being provided at this inlet (8) or outlet (9) with control means with a flow rate control state variable for modifying a first flow rate of the coolant in the piping network (7); and a control unit (13) which adjusts the flow rate control state variable of the control means on the basis of a drive current of the electric motor (4) or on the basis of a second flow rate of the suctioned gas such that a temperature T.sub.w,out at the outlet (9) of the piping network (7) is driven to a predefined level.

A ported-shroud centrifugal compressor for a turbocharger includes an inlet-adjustment mechanism in an air inlet for the compressor, operable to move between an open position and a closed position in the air inlet. The inlet-adjustment mechanism includes an axially elongated ring. In the open position, the radially outer surface of the ring is spaced from a tapering inner surface of the air inlet so that air can flow in an annular passage between the tapering surface and the ring, and the ring opens the ported shroud. In the closed position, the ring abuts the tapering surface to close off the annular passage and to close off the ported shroud. Movement of the inlet-adjustment mechanism from the open position to the closed position is effective to shift the compressor's surge line to lower flow rates.

A stall margin modulation (SMM) control system in communication with a gas turbine engine including a compressor is described herein. The SMM control system is configured to determine the stall margin of the compressor, operate the gas turbine engine using the determined stall margin, assess a health of the compressor, and modify the stall margin based on the assessed health of the compressor.

A compressor control method includes providing variable aerodynamic sizing of fluid flow through a compressor at multiple operating points of the compressor. A head is determined for an operating point, based on a process input at that operating point. Further, for that operating point, a control pressure number is determined as a function aerodynamic flow sizing at that operating point. The control pressure number is determined a function of the head divided by the square of a tip speed of the impeller of the compressor. An operating speed setpoint is determined based on the determined head and control pressure number.

A method for controlling multi-stage centrifugal compressors is provided. It allows an optimization of compressor head and efficiency at each compression stage and is specifically valuable at reduced compressor flow.

A method of operating a chiller to avoid future surge events, the method comprises applying chiller operating data associated with a chiller as an input to one or more machine learning models; and generating a threshold for a controllable chiller variable to prevent a future chiller surge event from occurring based on an output of the one or more machine learning models, further comprising affecting operation of the chiller based on the threshold to prevent the future chiller surge event from occurring. The method enables automatic control of a chiller to avoid future chiller surge events.

Provided herein are dynamic compressor systems and methods of operation. A compressor system comprises a compressor and a variable flow extractor disposed downstream of the compressor to split a compressor outlet stream into a recirculation stream and a system outlet stream. A variable flow injector disposed upstream of the compressor that mixes the recirculation stream with a system feed stream to form a compressor inlet stream. A controller is configured to receive first data indicative of a pressure of the system outlet stream, second data indicative of a pressure of the system feed stream, and third data indicative of flow rates of at least two of the system feed stream, the system outlet stream, and the recirculation stream. The controller adjusts a flow rate of the recirculation stream via the variable flow extractor and the variable flow injector based on the first, second, and third data.