KR20160034439A - Ess use ship generator drive device - Google Patents

Ess use ship generator drive device Download PDF

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Publication number
KR20160034439A
KR20160034439A KR1020140124710A KR20140124710A KR20160034439A KR 20160034439 A KR20160034439 A KR 20160034439A KR 1020140124710 A KR1020140124710 A KR 1020140124710A KR 20140124710 A KR20140124710 A KR 20140124710A KR 20160034439 A KR20160034439 A KR 20160034439A
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KR
South Korea
Prior art keywords
ess
generator
load
voltage
engine generator
Prior art date
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KR1020140124710A
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Korean (ko)
Inventor
김현재
Original Assignee
현대중공업 주식회사
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Priority to KR1020140124710A priority Critical patent/KR20160034439A/en
Publication of KR20160034439A publication Critical patent/KR20160034439A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The present invention relates to an in-ship generator driving apparatus using an energy storage system, and more particularly, to a system for supplying a voltage generated from an engine generator installed on a ship directly to a load, and a voltage is rectified to a DC voltage through a charger, An in-vessel generator driving system using an energy storage system that supplies a voltage stored in an ESS to a load in response to a control signal output from a drive control unit, the apparatus comprising: a storage capacity detection sensor installed in the ESS; When the storage capacity in the ESS detected in real time through the storage capacity detection sensor drops below a predetermined capacity, the engine generator is operated in the constant torque generation mode until the ESS charge amount becomes 100%.
Therefore, it is possible to utilize the ESS economically, and by allowing the intermittent load to be accommodated in the ESS in the generator load following period, the fuel saving effect of the engine generator can be obtained.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an energy-

The present invention relates to an in-ship generator drive system using an energy storage system, and more particularly, to an energy storage system (hereinafter referred to as "ESS") which can be economically used without an additional power generation system, In ESS, the intermittent load can be compensated by the ESS in the load follow-up period. In addition, the peak power of the transient transient state can be handled in the ESS to ensure the stability of the system. In case of load sharing mode between generators, ESS can compensate the load for a certain period of time even if there is a delay in input of the generator, so that the effect against the accident can be obtained and the reverse current generated during motor braking can be regenerated and stored .

Today, the renewable energy business of solar and wind power generation has developed a lot but there are many places that are not applied to various fields yet. Among them, lighthouse at sea level, street light at ship and ground are sometimes constructed to use solar power and wind power generator to produce electricity by self-power generation in order to use electric power.

In modern society, solar energy, wind power, wave power, and geothermal power, which are new and renewable energy, are attracting attention, and they are being used in various fields.

On the other hand, in large ships or marine structures composed of floating production storage and offloading (FPSO), offshore platforms and similar power systems, the engine and main generator And the main system is operated.

In addition, the engine or the main generator may have a blackout when power is not instantaneously supplied due to a temporary failure. Therefore, a separate generator start system is provided for smooth recovery of the main generator during blackout.

Such a generator starter system is intended for an initial start or restart of the main generator, including a starter generator engine and a compressed air supply. Here, in order to drive the starter generator engine, it is very important to supply compressed air, which is the initial driving force, to the rotating body of the starter power generation engine.

However, when such a generator start system fails, the engine start itself is impossible and the entire power system can not return to a normal state.

Recently, there has been a growing interest in energy efficient high efficiency vessels in the shipbuilding industry through air pollution prevention agreements. As an alternative, research and development on the construction of electrical systems for ships using ESS It is actively being done.

Here, the energy storage system (ESS) refers to a storage device that stores excess power generated by a generator and temporarily supplies power to the load or supplies power to the load when the power is insufficient. A related device that efficiently manages the battery and the battery , Battery-powered ESS uses lithium ion and sodium sulfide, and ESS is a promising future business for stable supply of renewable energy.

However, most of the prior arts applying the ESS of the ship have a problem in that the voltage developed in the engine generator 1 is supplied directly to the load 8 as shown in Figs. 1 (a) and 1 (b) And is then rectified and stored in the ESS 5 and then supplied directly to the DC voltage or converted to an AC voltage according to the form of the load 8 and supplied to the solar battery 2 or the wind turbine 3 The regenerated energy is converted into a constant DC voltage through the DC-DC converter 6, then stored in the ESS 5 and supplied to the load 8 driven by the DC voltage, or the DC-AC converter 7 And then supplied to the load 8 driven by the AC voltage.

However, since the power generation system having such a configuration requires additional power generation systems in addition to the ESS that requires a high level of material and installation cost, it is difficult to realize the system realistically and it is difficult to draw attention of the shipowner due to complicated system implementation.

In addition, there is a problem that it is difficult to secure the rationality of using ESS because the establishment of a wind turbine / photovoltaic generator in addition to the economical ESS capacity selection flow has not been established at all.

Korean Registered Patent No. 10-1363513 (February 10, 2014) Korean Patent Registration No. 10-1270259 (May 27, 2013) Korean Registered Patent No. 10-1373874 (Mar. 06, 2014) Korean Registered Patent No. 10-1431429 (Aug. 11, 2014)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the related art, and it is an object of the present invention to provide a storage capacity detection sensor of an ESS, a generator driving control unit, (For example, 30 to 40%), the engine generator is operated in a constant torque mode until the ESS charge amount reaches 100% (that is, the ESS charge interval ESS can be utilized economically by operating the same constant torque at the same torque), and the intermittent load can be handled in the ESS in the generator load following period, so that the fuel saving effect of the engine generator can be obtained, The peak power of the transient state can be handled by the ESS, thereby ensuring the stability of the system, Even in case of a delay in the delay of the generator input in the parallel sharing mode (load sharing mode), the ESS can prevent the delays in the input of the generator due to the load being loaded, and the reverse current generated during the motor braking can be regenerated and stored. And an object of the present invention is to provide an in-ship generator drive system using an energy storage system capable of greatly improving reliability of a ship.

According to an aspect of the present invention, there is provided an apparatus for supplying power to a load, comprising: a generator for supplying a voltage generated from an engine generator directly to a load, a rectifier for rectifying a DC voltage through a charger and storing the voltage in an ESS, And an energy storage system for supplying a voltage stored in the ESS to the load in response to a signal, the apparatus comprising: a storage capacity detection sensor installed in the ESS, If the storage capacity in the ESS detected in real time drops below the predetermined capacity, the engine generator is operated in the constant torque generation mode until the ESS charge amount becomes 100% (that is, the engine generator is set to the actual load follow- The maximum load of the load following load ) It characterized in that one to.

In this case, the predetermined capacity in the ESS for operating the engine generator in the constant torque generation mode in the generator drive control unit is 30 to 40% or less of the maximum charge capacity.

In addition, when the engine generator is operated in the constant torque power generation mode in the generator drive control unit and the charge capacity in the ESS becomes 100%, the engine generator is switched to the load follow-up mode and driven. The ESS is intermittent load feeding control is performed.

As described above, according to the in-ship generator driving system using the energy storage system of the present invention, it is possible to use the ESS as a ship in an existing generator system without additional power generation systems such as solar power generation and wind power generation If the ESS, the generator drive control unit and the storage capacity detection sensor of the ESS are further installed, the engine generator is stopped until the ESS charge amount becomes 100% when the storage capacity is reduced to a predetermined capacity (for example, 30 to 40% By operating in constant torque generation mode, ESS can be utilized economically, and the fuel saving effect of the engine generator can be obtained by allowing the intermittent load to be accommodated in the ESS during the generator load following period.

In addition, it is possible to secure the stability of the system because the peak power of the transient transient state can be handled by the ESS. In addition, even if the generator input delay occurs in the load sharing mode between the generators, It is possible to prevent a delay in input of the generator because it can cope with the load, and also it is possible to regenerate and store the reverse current generated when the motor is braked, thereby greatly improving the reliability of the system itself.

1 (a) and 1 (b) are block diagrams of a generator driving apparatus using an ESS applied to a conventional ship.
2 is a block diagram of an apparatus according to the present invention;
3 is a flow chart for explaining an operating state of the apparatus of the present invention.
Fig. 4 is a performance curve showing the rotational power of the engine of the engine, the output of the engine, and the fuel consumption rate for explaining that the fuel saving effect is better than the frequent torque change when the engine generator is operated in the constant torque generation mode.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of the apparatus of the present invention. FIG. 3 is a flow chart for explaining the operating state of the apparatus of the present invention, and FIG. 4 is a graph showing the rotational power of the engine, Fig.

According to the present invention,

Not only the voltage generated in the engine generator 1 installed on the ship is directly supplied to the load 8 but also some voltage is rectified to the DC voltage through the charger 4 and stored in the ESS 5, An in-vessel generator driving apparatus using an energy storage system that supplies a voltage stored in an ESS (5) to a load (8) in response to an output control signal,

A storage capacity detection sensor 10 is additionally provided in the ESS 5 and a storage capacity of the ESS 5 detected in real time through the storage capacity detection sensor 10 by the generator drive control unit 9 is determined The engine generator 1 is operated in the constant torque generation mode until the charged amount of the ESS 5 reaches 100%.

At this time, the predetermined capacity in the ESS 5 for operating the engine generator 1 in the constant-torque power generation mode in the generator drive control unit 9,

Is not more than 30 to 40% of the maximum charge capacity of the ESS (5).

When the engine generator 1 is operated in the constant torque mode by the generator drive control unit 9 and the charge capacity in the ESS 5 reaches 100%

The engine generator 1 is switched to the load following mode and driven, and the ESS 5 performs intermittent load feeding control.

The operation and effect of the energy storage system of the present invention constructed in the above-described manner in the onboard generator will be described below.

2, a known in-ship generator drive apparatus having an engine generator 1, a charger 4, an ESS 5, and a generator drive control unit 9 is connected to the ESS And a storage capacity detection sensor 10 for detecting in real time the storage capacity in the ESS 5 in real time and delivering it to the generator drive control unit 9 in real time, The storage capacity in the ESS 5 detected in real time through the capacity detection sensor 10 is determined. If the capacity is lowered to a predetermined capacity or less, the engine generator 1 is operated in the constant torque generation mode and supplied to the load 8 The main technical component is that the ESS (5) is automatically charged by the remaining electric power.

That is, a storage capacity detection sensor 10 for detecting the storage capacity in the ESS 5 in real time is installed in the ESS 5 to control the operation of the engine generator 1 in correspondence with the actual load follow- The generator drive control unit 9 continuously determines the storage capacity in the ESS 5 detected in real time through the storage capacity detection sensor 10 and for example when the charging capacity in the ESS 5 reaches the ESS 5, , The actual load follow-up amount of the engine generator (1) is set to the highest load among the load follow-up amounts within a predetermined range until the charge amount of the ESS (5) becomes 100% (That is, the engine generator 1 is operated in a constant torque generating mode) so that the ESS 5 can be automatically charged by the power remaining in the current load 8 will be.

On the other hand, in the case of the in-vessel engine generator 1 to which the present invention apparatus is applied, it operates normally at a constant number of revolutions (for example, 720RPM or 900RPM) and changes the torque according to the load 8 Follow the profile.

However, since the power consumption is not constant during this process, if the engine is followed by the frequently changing load, the fuel efficiency is lowered due to frequent changes in the fuel consumption, and the fuel consumption is further increased.

Therefore, in the present invention, the generator drive control unit 9, which judges the state of the engine generator 1 in real time, ensures the load profile of the ship and does not follow the load power as it is during a period of considerably frequent load change, To operate at a constant torque (kW).

For example, an engine generator (1) of 1000 kW (the capacity of a three-phase generator has a capacity in the range of 800 kW to 1200 kW) in an ordinary operating section is operated for one hour in a region where the variation from a 60% load to a 70% (Estimated to be 3% to 5% of total fuel consumption) in the transitional period is about 6 kg, the total fuel consumption rate (SFOC) is 132 kg.

 In the same section, if the generated power is not changed according to the load ratio and the power is constantly generated from the demand of the load power to the maximum power (for example, 70%), the total fuel consumption rate consumed for one hour is 130.2 kg Can be seen from the graph shown in Fig.

Generally, such an interval means a period in which the amount of fuel consumed in the method of operating the engine generator in the constant torque mode is equal to or smaller than the amount of fuel consumed in the load following engine due to the frequent change of the load.

This phenomenon shows that the system of generating a constant torque is more economical in a period in which the load of the engine generator 1 is low and the load change is frequent.

Accordingly, in the present invention, the generator drive control unit 9, which controls the operation of the engine generator 1 in accordance with the actual load follow-up amount during normal operation in the operating period of the ship, The storage capacity of the ESS 5 is detected in real time through the storage capacity detection sensor 10 installed in the storage unit 5 and the storage capacity of the ESS 5 is 30 to 40% The ESS 5 is automatically charged by the electric power which is supplied to the current load 8 by operating the engine generator 1 in the constant torque generating mode until the charged amount of the ESS 5 becomes 100% .

In addition, when the charging capacity in the ESS 5 becomes 100% due to charging the ESS 5 by operating the engine generator 1 in the constant torque power generation mode as described above, The generator 1 switches back to the load following mode and drives it as in normal operation and the ESS 5 performs intermittent load feeding control to drive the ESS 5 to the instantaneous instantaneous voltage The DC voltage is directly supplied to the load to be supplied, or is converted into an AC voltage through a DC-AC converter (not shown) to be supplied to the load.

Here, when the charging voltage in the ESS 5 is discharged to 70%, the engine generator 1 is operated in the constant torque generating mode to supply the current load 8 with the remaining power, The reason is that frequent ESS (5) charging and discharging result in a reduction in the lifetime of the ESS (5), which, according to research, results in a dramatic reduction in life span if fully charged and fully discharged.

In the present invention, the ESS 5, the generator drive control unit 9 and the storage capacity detection sensor 10 are simply installed in the existing generator system without the additional power generation system, so that a predetermined capacity of the storage capacity in the ESS 5 The ESS can be economically utilized by operating the engine generator 1 at a constant torque higher than the load follow-up amount until the ESS charge amount becomes 100%, and at the same time, The fuel in the engine generator can be greatly reduced because the ESS 5 can handle the intermittent load.

In addition, since the peak power of the transient transient state can be handled by the ESS 5, the stability of the system can be ensured. In addition, even if a delay occurs in the generator input delay during parallel operation between generators, It is possible to prevent a delay in input of the generator and also to save the reverse current generated when the motor is braked, so that the reliability of the system itself and the reliability according to the operation of the system can be greatly improved.

Although the preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Which will be apparent to those skilled in the art.

1: engine generator
4: Charger
5: ESS
8: Load
9: generator drive control unit
10: Storage capacity detection sensor

Claims (3)

In addition to supplying the voltage generated from the engine generator installed on the ship directly to the load, some voltage is rectified to the DC voltage through the charger and stored in the ESS, and the voltage stored in the ESS is supplied to the load in response to the control signal output from the generator drive control unit A method of operating a generator in a ship using an energy storage system,
If a storage capacity detection sensor is additionally installed in the ESS and the storage capacity of the ESS detected by the generator drive control unit in real time through the storage capacity detection sensor drops below a predetermined capacity, And the engine generator is operated in a constant torque generating mode.
The method according to claim 1,
The predetermined capacity in the ESS for operating the engine generator in the constant-torque power generation mode in the generator drive control section is,
And the maximum charge capacity is 30 to 40% or less of the maximum charge capacity.
The method according to claim 1,
When the engine generator is operated in the constant torque mode by the generator drive control unit and the charge capacity in the ESS reaches 100%
Wherein the engine generator is driven by switching to a load following mode, and the ESS performs intermittent load feeding control.
KR1020140124710A 2014-09-19 2014-09-19 Ess use ship generator drive device KR20160034439A (en)

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KR1020140124710A KR20160034439A (en) 2014-09-19 2014-09-19 Ess use ship generator drive device

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KR1020140124710A KR20160034439A (en) 2014-09-19 2014-09-19 Ess use ship generator drive device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180136051A (en) 2017-06-14 2018-12-24 성 훈 김 Control method of deep cement mixing method
KR20200144372A (en) 2019-06-18 2020-12-29 현대글로벌서비스 주식회사 The apparatus for supplying a gas to the fuel cell for a ship

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180136051A (en) 2017-06-14 2018-12-24 성 훈 김 Control method of deep cement mixing method
KR20200144372A (en) 2019-06-18 2020-12-29 현대글로벌서비스 주식회사 The apparatus for supplying a gas to the fuel cell for a ship

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