Power generation protection system of ship closed-loop power station

Abstract

The invention relates to a ship closed-loop power station power generation protection system. Comprising an advanced generator protection system, a whole ship monitoring alarm control system, a power management system, a main propeller electric driving system, a bow thruster driving system and a DP-2 dynamic positioning system, and the advanced generator protection system, the power management system, the main propeller electric driving system, the bow thruster driving system and the DP-2 dynamic positioning system are arranged in the whole ship. All are connected with the whole ship monitoring alarm control system; according to the invention, an event correlation algorithm and an event voting algorithm are provided, the performance of quick action based on events in an advanced generator protection system is more outstanding than that of quick action based on power and excitation, and quick response can be realized under the condition that the generator has a speed regulator fault or an automatic voltage regulator fault; and timely and rapid monitoring and isolation are realized, so that the power grid is stably transited to a balanced state.

Description

Technical Field

[0001] The present invention relates to the technical field of ship power generation, and in particular to a ship closed-loop power station power generation protection system. Background Art

[0002] In order to save energy and reduce emissions, operate economically and improve the reliability and flexibility of the distribution network, more and more dynamically positioned ships choose to use closed-loop power network systems in the design of distribution networks. Among them, advanced generator protection is one of the key points of the closed-loop power grid reliability assessment by various classification societies.

[0003] However, existing generators cannot respond quickly when a speed regulator fails or an automatic voltage regulator fails, and cannot monitor and isolate the fault in a timely and rapid manner, and cannot smoothly transition the power grid to a balanced state. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a ship closed-loop power station power generation protection system.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a closed-loop power station power generation protection system for ships, the innovation of which is: including an advanced generator protection system, a whole ship monitoring alarm control system, a power management system, a main propulsion electric drive system and a bow thruster drive system, and a DP-2 dynamic positioning system, and the advanced generator protection system, the power management system, the main propulsion electric drive system, the bow thruster drive system and the DP-2 dynamic positioning system are all connected to the whole ship monitoring alarm control system; The advanced generator protection system is used for fault monitoring of the generator set speed governor and the generator AVR and can trip the faulty generator in time before the fault expands, so as to improve the safety level of the power station under the closed operation of the bus tie switch; The advanced generator protection system adopts event correlation algorithm and event voting algorithm, and continuously compares the measured data with the expected data of the system mathematical model. When a primary deviation occurs, that is, the deviation is less than 1%, a backup generator will be started and an alarm will be issued. When the deviation is greater, the faulty generator will be tripped, and it can operate in the compensation droop mode, fixed droop mode and isochronous mode, or in different asymmetric load modes of the PMS system, including an asymmetric load mode in which the load distribution is controlled by an external system in the fixed droop mode or isochronous mode; The advanced generator protection system includes a synchronization device, a generator, and a signal sensor of a switchboard. The signal sensor of the switchboard includes a voltage sensor, a current sensor, and a power sensor, which provide a monitoring function of a speed control system and a monitoring function of a voltage control system. The monitoring function of the speed control system provides active power distribution, and the monitoring function of the voltage control system provides reactive power distribution. The ship-wide monitoring and alarm control system provides a computer-based, distributed integrated alarm, monitoring and control system for the shipboard equipment. It is designed to be modular and expandable to facilitate possible replacement needs during the life cycle of the ship. It is also connected to the main diesel engine and MRV carbon emission monitoring plan, meets the CCS AUT-0 and DP-2 classification notation requirements and the requirements of relevant electromagnetic compatibility standards, and can work normally under the condition of THD<8%. It not only includes alarm recording and printing functions, but also self-diagnosis functions, that is, an alarm is issued when the system or components fail.

[0006] Furthermore, the power management system is used for the control, protection and monitoring of the medium-voltage and low-voltage power systems of the ship, and the control objects include 6 main generator sets, 2 moored generator sets, 6600V switchboard, 400V switchboard, 230V switchboard and emergency switchboard, main propulsion system, bow thruster drive system; The power management system provides safe electric energy for the ship's electrical equipment under various working conditions, achieving uninterrupted power supply, and can achieve optimal control of the ship's electric propulsion system power station through advanced algorithms; The power management system (PMS) has comprehensive management functions, automatic monitoring, control and protection functions, and meets DP-2 requirements.

[0007] Furthermore, the main propulsion electric drive system includes three full-rotation main propulsion units, all of which use induction motors as prime movers, and change the propeller speed through variable frequency speed control to change the thrust and power of the propeller, including a main propulsion motor, a main propulsion transformer, a main propulsion inverter, and a main propulsion UPS.

[0008] Furthermore, the bow thruster drive system includes three bow thrusters, all of which use induction motors as prime movers, and change the propeller speed through variable frequency speed control to change the thrust and power of the bow thruster, including a bow propulsion motor, a bow transformer, a bow frequency converter, and a bow UPS.

[0009] Furthermore, it also includes a cabin fan frequency conversion control system, which is connected to the ship-wide monitoring and alarm control system. It is equipped with a cabin temperature sensor, a pressure difference sensor, a frequency converter, and a control cabinet to drive the cabin fan to ensure that the cabin ambient temperature and pressure remain within a certain range.

[0010] Furthermore, it also includes a radio combination radio system with the functions of the Ship Security Alert System (SSAS) and the Long Range Tracking and Identification System (LRIT), which includes a radio combination radio, a navigational weather warning receiver, a lifeboat two-way VHF radiotelephone, an emergency radio position-indicating beacon, and a radar transponder. The equipment meets the GMDSS A1+A2+A3 sea area configuration requirements; The radio combination station is powered by a special radio distribution box, which is powered by two AC 230V main and emergency distribution boards and can be switched automatically. When a power supply failure occurs, an audible and visual alarm will be issued.

[0011] Furthermore, it also includes a propulsion control and indication system, wherein all monitoring alarms of the propulsion control and indication system are connected to the whole ship monitoring alarm control system; Each thruster is equipped with an independent propulsion control and indication system, which is independent of each other and powered separately.

[0012] There are 6 sets on the ship. The thrusters can be operated on the front control console, wing console, rear control console, centralized control console and on-site emergency control panel in the cab. The thruster joysticks on the front, left wing, right wing and rear control consoles in the cab are synchronized through the electric shaft system.

[0013] The advantages of the present invention are: This patent proposes an event correlation algorithm and an event voting algorithm. The event-based rapid action in the advanced generator protection system is more prominent than the power and excitation-based rapid action performance. It can respond quickly to the generator speed governor failure or the generator automatic voltage regulator failure, and can monitor and isolate in a timely and rapid manner, so that the power grid can smoothly transition to a balanced state. DETAILED DESCRIPTION

[0014] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the preferred embodiments.

[0015] A closed-loop power station power generation protection system for ships, comprising an advanced generator protection system, a whole-ship monitoring and alarm control system, a power management system, a main propeller electric drive system and a bow thruster drive system, and a DP-2 dynamic positioning system, wherein the advanced generator protection system, the power management system, the main propeller electric drive system, the bow thruster drive system and the DP-2 dynamic positioning system are all connected to the whole-ship monitoring and alarm control system; The ship is equipped with electric motors, starters, electric heaters, main propulsion electric drive system, bow thruster electric drive system, engine room fan frequency conversion control system and emergency cut-off.

[0016] All motors should comply with the latest national or IEC standards, and the insulation level should not be lower than Class F. Motors with a power of more than 0.5kW should be three-phase motors. Motors with a power of more than 150kW should be equipped with temperature sensors for alarm. The speed of the motor is generally not more than 1500rpm.

[0017] The motors are made by ABB, Siemens, BEVI or equivalent brands, and the bearings of all motors are made by SKF or equivalent brands.

[0018] Open deck machinery, motors below the cabin steel plate and all motors with a power of more than 7.5kW are equipped with moisture-proof heaters, which are automatically disconnected when the motor is started.

[0019] There should be a margin of no less than 10% between the rated output power of the motor and the shaft power of the driven pump.

[0020] All starters for motors larger than 0.5kW are controlled by contactors, and the control voltage is 220V or less.

[0021] All motor starters are marine grade and can withstand high humidity environments and ship vibrations.

[0022] Usually, AC motor starters are direct starters. For motors powered by 400V distribution networks, Y / Δ starting is used when the motor is greater than 110kW and less than or equal to 132kW unless otherwise specified, and soft starting is used when the motor is greater than 132kW unless otherwise specified. For motors powered by emergency switchboards, Y / Δ starting or soft starting is used when the motor is greater than 45kW.

[0023] Motors larger than 7.5kW and main pump motor units are equipped with intelligent motor control modules, which are used to monitor, control and protect the operation of the motor. They can collect and track detailed information on various operating conditions during the operation of the motor, and achieve timely and accurate protection by setting fault alarms, protection actions, and action delay times, ensuring safe and reliable operation of the equipment.

[0024] The intelligent motor control module can connect detailed information on the motor's operating status to the ship's entire monitoring and alarm control system through the module's communication function, thereby achieving intelligent monitoring, control and protection of the motor.

[0025] After power is restored after a power grid failure, important pumps and loads should automatically restart in sequence.

[0026] The advanced generator protection system is used for fault monitoring of the generator set speed governor and the generator AVR and can trip the faulty generator in time before the fault expands, so as to improve the safety level of the power station under the closed operation of the bus tie switch; The advanced generator protection system adopts event correlation algorithm and event voting algorithm, and continuously compares the measured data with the expected data of the system mathematical model. When a primary deviation occurs, that is, the deviation is less than 1%, a backup generator will be started and an alarm will be issued. When the deviation is greater, the faulty generator will be tripped, and it can operate in the compensation droop mode, fixed droop mode and isochronous mode, or in different asymmetric load modes of the PMS system, including an asymmetric load mode in which the load distribution is controlled by an external system in the fixed droop mode or isochronous mode; The advanced generator protection system includes a synchronization device, a generator, and a signal sensor of a switchboard. The signal sensor of the switchboard includes a voltage sensor, a current sensor, and a power sensor, which provide a monitoring function of a speed control system and a monitoring function of a voltage control system. The monitoring function of the speed control system provides active power distribution, and the monitoring function of the voltage control system provides reactive power distribution. The ship-wide monitoring and alarm control system provides a computer-based, distributed integrated alarm, monitoring and control system for the shipboard equipment. It is designed to be modular and expandable to facilitate possible replacement needs during the life cycle of the ship. It is also connected to the main diesel engine and MRV carbon emission monitoring plan, meets the CCS AUT-0 and DP-2 classification notation requirements and the requirements of relevant electromagnetic compatibility standards, and can work normally under the condition of THD<8%. It not only includes alarm recording and printing functions, but also self-diagnosis functions, that is, an alarm is issued when the system or components fail.

[0027] The power management system is used for the control, protection and monitoring of the medium-voltage and low-voltage power systems of the ship. The control objects include 6 main generator sets, 2 mooring generator sets, 6600V distribution board, 400V distribution board, 230V distribution board and emergency distribution board, main propulsion system and bow thruster drive system. The power management system provides safe electric energy for the ship's electrical equipment under various working conditions, achieving uninterrupted power supply, and can achieve optimal control of the ship's electric propulsion system power station through advanced algorithms; The power management system (PMS) has comprehensive management functions, automatic monitoring, control and protection functions, and meets DP-2 requirements.

[0028] The main propulsion electric drive system includes three full-rotation main propulsion units. All three full-rotation main propulsion units use induction motors as the motive force. The propeller speed is changed through variable frequency speed control to change the thrust and power of the propeller. The main propulsion motor, main propulsion transformer, main propulsion inverter and main propulsion UPS are included.

[0029] The bow thruster drive system includes three bow thrusters, all of which use induction motors as prime movers. The propeller speed is changed by variable frequency speed control to change the thrust and power of the bow thruster. The system includes a bow propulsion motor, a bow transformer, a bow frequency converter, and a bow UPS.

[0030] It also includes a cabin fan frequency conversion control system, which is connected to the ship-wide monitoring and alarm control system. It is equipped with a cabin temperature sensor, a pressure difference sensor, a frequency converter, and a control cabinet to drive the cabin fan to ensure that the cabin ambient temperature and pressure remain within a certain range.

[0031] It also includes a radio combination radio system with the functions of the Ship Security Alert System (SSAS) and the Long Range Tracking and Identification System (LRIT), which includes a radio combination radio, a navigational weather warning receiver, a lifeboat two-way VHF radiotelephone, an emergency radio position-indicating beacon, and a radar transponder. The equipment meets the GMDSS A1+A2+A3 sea area configuration requirements; The radio combination station is powered by a special radio distribution box, which is powered by two AC 230V main and emergency distribution boards and can be switched automatically. When a power supply failure occurs, an audible and visual alarm will be issued.

[0032] It also includes a propulsion control and indication system, all monitoring alarms of the propulsion control and indication system are connected to the whole ship monitoring alarm control system; Each thruster is equipped with an independent propulsion control and indication system, which is independent of each other and powered separately.

[0033] There are 6 sets on the ship. The thrusters can be operated on the front control console, wing console, rear control console, centralized control console and on-site emergency control panel in the cab. The thruster joysticks on the front, left wing, right wing and rear control consoles in the cab are synchronized through the electric shaft system.

[0034] This patent proposes a new event correlation algorithm and event voting algorithm, and adopts GOOSE message communication. The event-based rapid action in the advanced generator protection system is more prominent than the power and excitation-based rapid action performance. It can respond quickly when the generator has a governor failure or the generator has an automatic voltage regulator failure, and can monitor and isolate in a timely and rapid manner, so that the power grid can smoothly transition to a balanced state.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A closed-loop power station power generation protection system for a ship, characterized in that: It includes an advanced generator protection system, a whole-ship monitoring and alarm control system, a power management system, a main propulsion electric drive system and a bow thruster drive system, and a DP-2 dynamic positioning system, and the advanced generator protection system, the power management system, the main propulsion electric drive system, the bow thruster drive system and the DP-2 dynamic positioning system are all connected to the whole-ship monitoring and alarm control system; The advanced generator protection system is used for fault monitoring of the generator set speed governor and the generator AVR and can trip the faulty generator in time before the fault expands, so as to improve the safety level of the power station under the closed operation of the bus tie switch; The advanced generator protection system adopts event correlation algorithm and event voting algorithm, and continuously compares the measured data with the expected data of the system mathematical model. When a primary deviation occurs, that is, the deviation is less than 1%, a backup generator will be started and an alarm will be issued. When the deviation is greater, the faulty generator will be tripped, and it can operate in the compensation droop mode, fixed droop mode and isochronous mode, or in different asymmetric load modes of the PMS system, including an asymmetric load mode in which the load distribution is controlled by an external system in the fixed droop mode or isochronous mode; The advanced generator protection system includes a synchronization device, a generator, and a signal sensor of a switchboard, and provides a monitoring function of a speed control system and a monitoring function of a voltage control system. The monitoring function of the speed control system provides active power distribution, and the monitoring function of the voltage control system provides reactive power distribution. The ship-wide monitoring and alarm control system provides a computer-based, distributed integrated alarm, monitoring and control system for shipboard equipment. It is designed to be modular and expandable to facilitate possible replacement needs during the life cycle of the ship. It is also connected to the main diesel engine.

2. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: The power management system is used for the control, protection and monitoring of the medium voltage and low voltage power systems of the ship. The control objects include the main generator set, moored generator set, switchboard and emergency switchboard, main propulsion system and bow thruster drive system.

3. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: The main propulsion electric drive system includes three full-rotation main propulsion units, all of which use induction motors as the motive force. The propeller speed is changed through variable frequency speed control to change the thrust and power of the propeller, including a main propulsion motor, a main propulsion transformer, a main propulsion inverter, and a main propulsion UPS.

4. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: The bow thruster drive system includes three bow thrusters, all of which use induction motors as prime movers. The propeller speed is changed by variable frequency speed control to change the thrust and power of the bow thruster. The system includes a bow propulsion motor, a bow transformer, a bow frequency converter, and a bow UPS.

5. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: It also includes a cabin fan frequency conversion control system, which is connected to the ship-wide monitoring and alarm control system. It is equipped with a cabin temperature sensor, a pressure difference sensor, a frequency converter, and a control cabinet to drive the cabin fan to ensure that the cabin ambient temperature and pressure remain within a certain range.

6. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: It also includes a radio combination radio system with the functions of the Ship Security Alert System (SSAS) and the Long Range Tracking and Identification System (LRIT), which includes a radio combination radio, a navigational weather warning receiver, a lifeboat two-way VHF radiotelephone, an emergency radio position-indicating beacon, and a radar transponder. The equipment meets the GMDSS A1+A2+A3 sea area configuration requirements; The radio combination station is powered by a special radio distribution box, which is powered by two AC 230V main and emergency distribution boards and can be switched automatically. When a power supply failure occurs, an audible and visual alarm will be issued.

7. A ship closed-loop power station power generation protection system according to claim 1, characterized in that: It also includes a propulsion control and indication system, all monitoring alarms of the propulsion control and indication system are connected to the whole ship monitoring alarm control system; Each thruster is equipped with an independent propulsion control and indication system, which is independent of each other and powered separately.