RU-2861395-C1 - METHOD FOR PREVENTIVE CONTROL OF MARINE ELECTRIC POWER SYSTEM

Abstract

FIELD: electrical engineering. SUBSTANCE: invention can be used for preventive control of marine electric power systems (MEPS). This technical result is achieved by the fact that in the proposed method for preventive control of MEPS, the moment of transition of the MEPS to an inoperable state is determined, the GS whose load is decreasing is identified, a GS whose load is increasing is selected, a signal is sent to reduce the fuel supply to the prime mover of this GS, a situation is determined when the load of the selected GS stops increasing upon receipt of a signal to reduce the fuel supply to its prime mover, and the GS whose load was decreasing before sending the signal to reduce the fuel supply to the selected GS is disconnected. EFFECT: expansion of the functionality of preventive control of MEPS by ensuring an emergency-free transition of the MEPS to a new stable state of correct functioning in the event that the control system generates a signal to permanently reduce the fuel supply to the prime mover of one of the generating sets (GS). 1 cl, 1 dwg

Inventors

• ShIROKOV Nikolai Viktorovich

Dates

Publication Date

20260505

Application Date

20251110

Claims (1)

1. A method of preventive control of a ship's electric power system, according to which the moment of transition of the ship's electric power system to an inoperative state is determined, the generator unit (GU) whose load is decreasing is determined, the generator unit (GU) whose load is increasing is selected, a signal is sent to decrease the fuel supply to the prime mover of this GU, a situation is determined in which the load of the selected GU stops increasing upon receipt of a signal to decrease the fuel supply to its prime mover, and the GU whose load was decreasing before the signal to decrease the fuel supply to the selected GU is sent is switched off.

Description

The invention relates to the field of electrical engineering and can be used for preventive control of ship electrical power systems (SEPS). A method for preventive control of an autonomous electric power system is known (patent RU 2785561 C1), according to which, when an autonomous electric power system is operating with more than two generator units (GU) operating in parallel, a mode is determined in which the load of only one of the GUs increases, and after a specified time interval, determined by differences in the inertia of the prime mover regulators, this GU is disconnected from the network. This approach allows for the efficient, bypassing of an emergency situation on board the vessel, transitioning the EPSS to a stable, properly functioning state in the event of a failure caused by the control system generating a signal to continuously increase fuel supply to one of the main generators. A stable, properly functioning EPSS is defined as a system state in which, in a given operating mode, it performs all assigned functions with the specified power quality indicators, and all operating main generators are operational. A disadvantage of this method is that it can only be used in EPSS mode, where more than two main generators operate in parallel, limiting its functionality. The closest and chosen by the author as a prototype is the method for controlling the SEES with parallel operating GA (patent RU 2739364 C1), according to which the moment of transition of the SEES to an inoperative state is determined, the generator unit (GU) whose load increases is selected, a signal is sent to reduce the fuel supply to the prime mover of this GU, the GU whose load continues to increase is determined when a signal is received to reduce the fuel supply to its prime mover, and this GU is switched off. This method also allows for the efficient transfer of the nuclear power plant to a stable, correct operating state, bypassing an emergency situation on board the vessel, in the event of a failure caused by the control system generating a signal to continuously increase the fuel supply to one of the main engines. A disadvantage of this method is that it can only be used in the event of a failure caused by the control system generating a signal to continuously increase the fuel supply to one of the operating main engines. It cannot be effectively applied to the case of a signal to continuously decrease the fuel supply or to the case of a fuel supply interruption due to a failure of the main engine's fuel injection system. This limits the functionality of this method. The aim of the present invention is to expand the functional capabilities of the method for preventive control of the SEPS by ensuring the failure-free transition of the SEPS to a new stable state of correct operation in the event that the control system generates a signal for a constant reduction in the fuel supply to the prime mover of one of the GAs. To solve the specified problem, the following set of essential features is used: in the method of preventive control of the SEES, the moment of transition of the SEES to an inoperative state is determined, the GA whose load is decreasing is determined, the GA whose load is increasing is selected, a signal is sent to decrease the fuel supply to the prime mover of this GA, a situation is determined in which the load of the selected GA stops increasing upon receipt of a signal to decrease the fuel supply to its prime mover, and the GA whose load was decreasing before the signal to decrease the fuel supply to the selected GA is switched off. The essence of the invention is that in the event of a sudden failure of the SEES control system (CS), in which the control system (CS) has generated a constant signal to reduce the fuel supply to the prime mover of one of the main engines (for example, due to the sticking of the contacts of the contactor reducing the fuel supply to its prime mover), its load will continuously decrease. At the same time, the load of the other main engine will increase, but will depend on the CS. SEES signals to change the amount of fuel supplied to its prime mover. Therefore, if a main engine is selected whose load increases despite a constant signal to reduce the fuel supply to another main engine and a signal to reduce the fuel supply is sent to the selected main engine, its load will not increase and, according to the prototype, it will not be erroneously disconnected from the grid. However, the other main engine will not be disconnected either; it will switch to propulsion mode and load the grid with reverse power, which may overload the selected main engine and disconnect it from the grid, leading to an emergency situation associated with a blackout of the vessel. Consequently, in this situation, this main engine must be disconnected. Thus, in the proposed invention, to achieve the stated goal, as in the prototype: determine the moment when the power system becomes inoperative; select the