EP2935843A1 - A control system of an internal combustion engine - Google Patents

A control system of an internal combustion engine

Info

Publication number
EP2935843A1
EP2935843A1 EP13812004.3A EP13812004A EP2935843A1 EP 2935843 A1 EP2935843 A1 EP 2935843A1 EP 13812004 A EP13812004 A EP 13812004A EP 2935843 A1 EP2935843 A1 EP 2935843A1
Authority
EP
European Patent Office
Prior art keywords
speed
droop
mode
engine
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13812004.3A
Other languages
German (de)
French (fr)
Other versions
EP2935843B1 (en
Inventor
Tom Kaas
Ari Saikkonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2935843A1 publication Critical patent/EP2935843A1/en
Application granted granted Critical
Publication of EP2935843B1 publication Critical patent/EP2935843B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply

Definitions

  • the invention relates to a control arrangement that controls generator sets when a grid trip occurs.
  • the rest of the network (the main network) is often called grid.
  • the reason for the disconnection can, for example, be a short circuit or malfunction of a big transformer in the grid.
  • Local power networks are often provided with a grid breaker arrangement for connecting and disconnecting the local network with the grid.
  • the local network is, for example, a power network of a factory.
  • Figure 1 shows an example of a grid breaker arrangement having a grid breaker relay 3 that controls breakers 6 to switch on and/or off. If the local network 2 has to be disconnected from the grid due to a serious malfunction, the grid breaker relay reacts to the malfunction and drives the breakers.
  • Figure 1 illustrates a normal situation wherein the local network is connected to the grid 1. As can be seen loads 5 and generator sets 4 in the local network are in connection with the grid. After the disconnection the local power network 2 with the loads 5 and the generator sets 4 forms a smaller power network being not in connection with the grid 1.
  • the generator set 4 is a combination of a generator and a prime mover.
  • the prime mover rotates the generator that provides electric energy.
  • the prime mover can, for example, be a reciprocating piston engine.
  • the engines/generator sets are normally run in a control mode that is called a kW mode when they are in connection with the grid. In the kW mode a control device does not need to control the engine's speed (i.e. grid frequency as well), because the grid frequency is supervised elsewhere. In the kW mode the control device controls the fuel demand of the engine by comparing a load setting value (load reference value) to the measured engine load.
  • load setting value load reference value
  • the local network may need to be disconnected from the grid.
  • the control of the engines must be changed from the kW mode to a speed droop mode.
  • the engines in the local network control also the frequency of the grid. Therefore, for example, the fuel demand of the engine is controlled by comparing a speed reference and a measured engine speed.
  • FIG. 2 illustrates the principle of the droop function in the speed droop mode.
  • a line 21 is a droop curve that defines what is a speed setting for different loads. For example, in 100 % load the speed setting (speed reference) for the engine is the value of the y-axis at point 23. As can be seen in the figure the speed setting decreases when the load increases or vice versa.
  • the point 22 at the droop curve in zero load (the point at the y-axis) is called speed set point for the droop curve.
  • the droop function changes the speed reference for the speed control of the engine.
  • the droop function is used because otherwise the engines do not share the load.
  • the speed droop control adjusts the speed reference for different loads it can be used for sharing loads between different engines. These features are utilized when the grid trip occurs.
  • the slopes of the engine specific droop curves should be the same.
  • the amount of load that the engine carries depends on the speed set point of the engine's droop curve. If the load of the local power network changes, the speed reference (the frequency reference as well) for the network is going to change as well. For offsetting the change of the speed reference i.e. returning the original speed (frequency) reference, the speed set points are adjusted.
  • the grid trip is usually associated with large load changes that affect on the engines.
  • the engine load changes rapidly and therefore also the engine's speed changes rapidly.
  • a usual situations is that the load decreases.
  • the initial position of the speed droop curve is calculated in such a way that the curve goes through the point of a measured load value of the engine and a measured speed value.
  • the measured speed value is used as an initial speed reference value in the droop curve.
  • the load sensor/measurement is slow creating delay.
  • the reaction of the grid breaker relay is also delayed. Therefore when the grid breaker relay reacts the speed of the engine has increased significantly that affects to the position of the speed droop curve.
  • the droop curve changes the speed reference higher in case where the load continues to decrease.
  • the engine overspeeds easily in this kind of situation.
  • the engine goes into over-speed that may cause a shutdown of the engine and a black out of the local grid.
  • the object of the invention is to alleviate or even eliminate the problems said above.
  • the object is achieved in a way described in the independent claims.
  • Dependent claims illustrate different embodiments of the invention.
  • the change of the control mode of the generator set in the local power network from the kW mode to the speed droop mode is arranged in a new way.
  • the phase of changing comprises a delaying phase that in turn comprises parallel sub-phases to disable the droop function of the speed droop mode and keeping a speed reference value at a rated speed of the engine of the generator set. After the delaying phase an activation phase enables the droop function.
  • Figure 1 illustrates an example of a connection arrangement between a main grid and a local network
  • Figure 2 illustrates the principle of the speed droop mode
  • Figure 3 illustrates an example of a control system to change the control of an engine from the kW mode to the speed droop mode according to the invention
  • Figure 4 illustrates an example how the invention works at the grid trip situation
  • Figure 5 illustrates a flow chart example of the method according to the invention. Description of the invention
  • FIG. 3 illustrates an example of a control system according to the invention.
  • a control device 36 controls power output of the generator set 34, 35 by comparing a power reference value 38 with a measured power value 37 in the output of the generator 35 of the generator set.
  • the measured power value is transmitted to the control device 36 via a feedback loop.
  • the comparison can, for example, provide a difference between the power reference value and the measured value.
  • the difference is used for forming a control signal that is transmitted to the engine 34 of the generator set.
  • the control signal can, for example, adjust a fuel supply to the engine, which changes a power production of the generator set.
  • the kW mode cannot be used when the engine and the local network is disconnected from the grid.
  • the control is changed to the speed droop mode in order that the engine can adjust the frequency of the local network with other possible engines that are connected to the local network.
  • the main control unit 33 handles the change 318 of the control mode from the kW mode 31 to the speed droop mode 32.
  • the changing is initiated when the main control unit receives info 314 about the disconnection.
  • the disconnection info is transmitted, for example, from the grid breaker relay.
  • a speed control device 310 is used to keep the engine's speed as close as possible a speed reference value 312.
  • the measured speed value is transmitted to the control device 310 via a feedback loop.
  • the comparison can provide a difference between the speed reference value and the measured value.
  • the difference is used for forming a speed control signal that is transmitted to the engine 34 of the generator set.
  • the control signal can, also in this case, adjust a fuel supply to the engine, which changes the speed of the output shaft of the engine.
  • a speed droop control device 311 that adjust the speed reference value 312 by providing a reference adjustment signal 317 that is transmitted to the speed control device 310.
  • the adjustment signal can increase or decrease the speed reference value.
  • the speed droop control device receives a power measurement 316 from the output of the generator 35. The functioning of the speed droop control has been described above.
  • the grid trip control system comprises a delaying unit 313 to disable a droop function of the speed droop control device 31 1 during a certain period, and a setting unit 315 to keep the speed reference value 312 in a rated speed of the engine of the generator set during said period.
  • the disabling of the droop function can be achieved, for example, by keeping the droop % in zero percentage during the period.
  • the droop curve is a horizontal line during the period.
  • the delay unit 313 is situated in the speed droop control device 311 and the setting unit 315 in the main control unit 33. However they can be situated in another way as well.
  • the delay unit can also be in the main control unit.
  • the system is arranged to enable the droop function.
  • the speed droop control device runs in the speed droop mode after the delay, it measures load of the generator set and utilizes the speed measurement of the engine for positioning the droop curve and offsetting the droop curve to the rated speed.
  • Figure 4 illustrates how the invention works.
  • the main control device 33 detects the disconnection of the local network from the grid and the control mode is changed from the kW mode to the speed droop mode.
  • the speed reference is kept in the rated speed of the engine during the delay period.
  • the droop function is also disabled during the delay.
  • the grid and the local network has run at the reference speed or near. So, rated speeds of the engines are designed so that the speeds correspond the reference frequency of the power network through the generators of the generators sets.
  • the disabling of the droop function prevents the increase of the speed reference value and therefore alleviates the possibility that the engine races. Keeping the reference speed at the rated speed stabilizes the control during the delay period.
  • the transients of the grid trip occur at the beginning of the grid trip. At least larger transients occur during the delay.
  • an activation phase begins when the droop function is enabled and the speed reference can be calculated according to the speed droop mode. The functioning during the delay period makes it possible that the control does not react too strongly to the transients and direct the engine to run at overspeed.
  • the engine's load 43 decreases due to the grid trip.
  • the load starts to decrease before the control mode is changed to the speed droop mode at moment 41.
  • the engine's speed 44 starts to increase before the moment 41 as well.
  • the rated speed is a nominal speed of the engine.
  • the frequency of the generators output is a desired frequency of the local network, for example 50 Hz or 60 Hz.
  • the speed control device drives the speed towards the rated speed.
  • the stabilized engine speed can, for example, be determined by utilizing a speed range around the rated speed value having upper and lower values 45.
  • the engine speed may, for example, vary between +- 1 % or +- 2% of the rated speed depending on the network and/or the engine itself.
  • Speed can be defined to be stable is the engine speed is in the range. However, even if the engine speed is in the range it is practical, in addition, to have a stabilization time 46 during which period the engine speed is considered to be within the range.
  • Figure 4 shows how the stabilization time 46 is in the delaying period.
  • the stabilization time can, for example, be 1 - 10 seconds. If the engine speed remains within the range the delaying period can be ended. Otherwise, the delaying period is extended, for example, by another stabilization time, or the delaying period should be determined to be longer.
  • the reference speed is kept or set to be at the rated speed during the whole delaying period.
  • the speed droop mode is enabled and the reference speed is not just kept at the rated speed, but it is calculated according to the speed rate mode making it possible to share the load between the other engines in the local network.
  • the time of the delay is selected to take into account the engine's size and type, the transients and load change at the grid trip, and the properties of the speed droop control mode.
  • FIG. 5 illustrates a flow chart example of the inventive method for controlling a grid trip in an event of disconnection of the local power network from the grid.
  • the method concerns the phase to change the control mode of the generator set in the local power network from the kW mode to the speed droop mode.
  • the phase of changing comprises a delaying phase 51 that comprises parallel sub-phases to disable 53 the droop function of the speed droop mode and keeping 54 the speed reference value at the rated speed of the engine of the generator set.
  • the method further comprises an activation phase 52 to enable 55 the droop function.
  • a method can also comprise a speed range around the rated speed having upper and lower values 45.
  • the speed of the engine is defined to be stable if the engine speed is in the range within a stabilization time 46.
  • Figure 4 illustrates the stabilization time belongs to the delaying phase 51.
  • the activation phase comprises functions to measure load of the generator set and speed of the engine, to position a droop curve using said measurements, and offsetting the droop curve to the rated speed.

Abstract

In an event of disconnection of a local power network (2) from a grid (1), the change of the control mode of a generator set in the local power network from a k W mode (31) to a speed droop mode (32), is provided. The phase of changing comprises a delaying phase (51) that in turn comprises parallel sub-phases to disable (53) a droop function of the speed droop mode and keeping (54) a speed reference value at a rated speed of an engine of the generator set. After the delaying phase an activation phase (52) enables the droop function.

Description

A control system of an internal combustion engine
Field of technology
The invention relates to a control arrangement that controls generator sets when a grid trip occurs.
Prior art
The grip trip means that a part of a power network is disconnected from the utility grid/elecrical grid, i.e. from the rest main power network in practice. The rest of the network (the main network) is often called grid. The reason for the disconnection can, for example, be a short circuit or malfunction of a big transformer in the grid. Local power networks are often provided with a grid breaker arrangement for connecting and disconnecting the local network with the grid. The local network is, for example, a power network of a factory.
Figure 1 shows an example of a grid breaker arrangement having a grid breaker relay 3 that controls breakers 6 to switch on and/or off. If the local network 2 has to be disconnected from the grid due to a serious malfunction, the grid breaker relay reacts to the malfunction and drives the breakers. Figure 1 illustrates a normal situation wherein the local network is connected to the grid 1. As can be seen loads 5 and generator sets 4 in the local network are in connection with the grid. After the disconnection the local power network 2 with the loads 5 and the generator sets 4 forms a smaller power network being not in connection with the grid 1.
The generator set 4 is a combination of a generator and a prime mover. The prime mover rotates the generator that provides electric energy. The prime mover can, for example, be a reciprocating piston engine. The engines/generator sets are normally run in a control mode that is called a kW mode when they are in connection with the grid. In the kW mode a control device does not need to control the engine's speed (i.e. grid frequency as well), because the grid frequency is supervised elsewhere. In the kW mode the control device controls the fuel demand of the engine by comparing a load setting value (load reference value) to the measured engine load.
As said above if a problem occurs in the grid the local network may need to be disconnected from the grid. In this case the control of the engines must be changed from the kW mode to a speed droop mode. In the speed droop mode the engines in the local network control also the frequency of the grid. Therefore, for example, the fuel demand of the engine is controlled by comparing a speed reference and a measured engine speed.
Figure 2 illustrates the principle of the droop function in the speed droop mode. A line 21 is a droop curve that defines what is a speed setting for different loads. For example, in 100 % load the speed setting (speed reference) for the engine is the value of the y-axis at point 23. As can be seen in the figure the speed setting decreases when the load increases or vice versa. The point 22 at the droop curve in zero load (the point at the y-axis) is called speed set point for the droop curve. In other words, the droop function changes the speed reference for the speed control of the engine. The droop function is used because otherwise the engines do not share the load.
In addition to the speed droop control adjusts the speed reference for different loads it can be used for sharing loads between different engines. These features are utilized when the grid trip occurs. To provide the load sharing between the engines the slopes of the engine specific droop curves should be the same. The amount of load that the engine carries depends on the speed set point of the engine's droop curve. If the load of the local power network changes, the speed reference (the frequency reference as well) for the network is going to change as well. For offsetting the change of the speed reference i.e. returning the original speed (frequency) reference, the speed set points are adjusted.
The grid trip is usually associated with large load changes that affect on the engines. The engine load changes rapidly and therefore also the engine's speed changes rapidly. A usual situations is that the load decreases. When changing from the kW mode to the speed droop mode the initial position of the speed droop curve is calculated in such a way that the curve goes through the point of a measured load value of the engine and a measured speed value. The measured speed value is used as an initial speed reference value in the droop curve. The load sensor/measurement is slow creating delay. The reaction of the grid breaker relay is also delayed. Therefore when the grid breaker relay reacts the speed of the engine has increased significantly that affects to the position of the speed droop curve. Yet further, the droop curve changes the speed reference higher in case where the load continues to decrease. Thus the engine overspeeds easily in this kind of situation. The engine goes into over-speed that may cause a shutdown of the engine and a black out of the local grid.
Short description
The object of the invention is to alleviate or even eliminate the problems said above. The object is achieved in a way described in the independent claims. Dependent claims illustrate different embodiments of the invention.
In an event of disconnection of the local power network from the grid, the change of the control mode of the generator set in the local power network from the kW mode to the speed droop mode is arranged in a new way. The phase of changing comprises a delaying phase that in turn comprises parallel sub-phases to disable the droop function of the speed droop mode and keeping a speed reference value at a rated speed of the engine of the generator set. After the delaying phase an activation phase enables the droop function.
List of figures
In the following, the invention is described in more detail by reference to the enclosed drawings, where
Figure 1 illustrates an example of a connection arrangement between a main grid and a local network, Figure 2 illustrates the principle of the speed droop mode,
Figure 3 illustrates an example of a control system to change the control of an engine from the kW mode to the speed droop mode according to the invention,
Figure 4 illustrates an example how the invention works at the grid trip situation, and
Figure 5 illustrates a flow chart example of the method according to the invention. Description of the invention
Figure 3 illustrates an example of a control system according to the invention. In the kW mode 31 a control device 36 controls power output of the generator set 34, 35 by comparing a power reference value 38 with a measured power value 37 in the output of the generator 35 of the generator set. The measured power value is transmitted to the control device 36 via a feedback loop. The comparison can, for example, provide a difference between the power reference value and the measured value. The difference is used for forming a control signal that is transmitted to the engine 34 of the generator set. The control signal can, for example, adjust a fuel supply to the engine, which changes a power production of the generator set.
Normally, the kW mode cannot be used when the engine and the local network is disconnected from the grid. The control is changed to the speed droop mode in order that the engine can adjust the frequency of the local network with other possible engines that are connected to the local network. The main control unit 33 handles the change 318 of the control mode from the kW mode 31 to the speed droop mode 32. The changing is initiated when the main control unit receives info 314 about the disconnection. The disconnection info is transmitted, for example, from the grid breaker relay. In the speed droop mode 32 a speed control device 310 is used to keep the engine's speed as close as possible a speed reference value 312.
That is performed by comparing the speed reference value 312 with a measured speed value 39 in the output shaft of the engine 34 of the generator set. The measured speed value is transmitted to the control device 310 via a feedback loop. The comparison can provide a difference between the speed reference value and the measured value. The difference is used for forming a speed control signal that is transmitted to the engine 34 of the generator set. The control signal can, also in this case, adjust a fuel supply to the engine, which changes the speed of the output shaft of the engine.
In addition, there is a speed droop control device 311 that adjust the speed reference value 312 by providing a reference adjustment signal 317 that is transmitted to the speed control device 310. The adjustment signal can increase or decrease the speed reference value. The speed droop control device receives a power measurement 316 from the output of the generator 35. The functioning of the speed droop control has been described above.
Further, the grid trip control system according to the invention comprises a delaying unit 313 to disable a droop function of the speed droop control device 31 1 during a certain period, and a setting unit 315 to keep the speed reference value 312 in a rated speed of the engine of the generator set during said period. The disabling of the droop function can be achieved, for example, by keeping the droop % in zero percentage during the period. In other words, the droop curve is a horizontal line during the period. In the example of figure 3 the delay unit 313 is situated in the speed droop control device 311 and the setting unit 315 in the main control unit 33. However they can be situated in another way as well. For example, the delay unit can also be in the main control unit. After the delay period has expired, the system is arranged to enable the droop function. When the speed droop control device runs in the speed droop mode after the delay, it measures load of the generator set and utilizes the speed measurement of the engine for positioning the droop curve and offsetting the droop curve to the rated speed.
Figure 4 illustrates how the invention works. At moment 41 the main control device 33 detects the disconnection of the local network from the grid and the control mode is changed from the kW mode to the speed droop mode. The speed reference is kept in the rated speed of the engine during the delay period. The droop function is also disabled during the delay. As can be noted the grid and the local network has run at the reference speed or near. So, rated speeds of the engines are designed so that the speeds correspond the reference frequency of the power network through the generators of the generators sets.
The disabling of the droop function prevents the increase of the speed reference value and therefore alleviates the possibility that the engine races. Keeping the reference speed at the rated speed stabilizes the control during the delay period. The transients of the grid trip occur at the beginning of the grid trip. At least larger transients occur during the delay. After the delay has expired at moment 42, an activation phase begins when the droop function is enabled and the speed reference can be calculated according to the speed droop mode. The functioning during the delay period makes it possible that the control does not react too strongly to the transients and direct the engine to run at overspeed.
As can be seen in the example of figure 4 the engine's load 43 decreases due to the grid trip. The load starts to decrease before the control mode is changed to the speed droop mode at moment 41. The engine's speed 44 starts to increase before the moment 41 as well. The rated speed is a nominal speed of the engine. When running at the rated speed the frequency of the generators output is a desired frequency of the local network, for example 50 Hz or 60 Hz. During the delay the load decreases towards a state in the local network, and the speed control device drives the speed towards the rated speed.
The stabilized engine speed can, for example, be determined by utilizing a speed range around the rated speed value having upper and lower values 45. The engine speed may, for example, vary between +- 1 % or +- 2% of the rated speed depending on the network and/or the engine itself. Speed can be defined to be stable is the engine speed is in the range. However, even if the engine speed is in the range it is practical, in addition, to have a stabilization time 46 during which period the engine speed is considered to be within the range. Figure 4 shows how the stabilization time 46 is in the delaying period. The stabilization time can, for example, be 1 - 10 seconds. If the engine speed remains within the range the delaying period can be ended. Otherwise, the delaying period is extended, for example, by another stabilization time, or the delaying period should be determined to be longer. The reference speed is kept or set to be at the rated speed during the whole delaying period.
After the delaying period has expired, the speed droop mode is enabled and the reference speed is not just kept at the rated speed, but it is calculated according to the speed rate mode making it possible to share the load between the other engines in the local network. The time of the delay is selected to take into account the engine's size and type, the transients and load change at the grid trip, and the properties of the speed droop control mode.
Figure 5 illustrates a flow chart example of the inventive method for controlling a grid trip in an event of disconnection of the local power network from the grid. The method concerns the phase to change the control mode of the generator set in the local power network from the kW mode to the speed droop mode. The phase of changing comprises a delaying phase 51 that comprises parallel sub-phases to disable 53 the droop function of the speed droop mode and keeping 54 the speed reference value at the rated speed of the engine of the generator set. After the delaying phase the method further comprises an activation phase 52 to enable 55 the droop function. A method can also comprise a speed range around the rated speed having upper and lower values 45. The speed of the engine is defined to be stable if the engine speed is in the range within a stabilization time 46. As Figure 4 illustrates the stabilization time belongs to the delaying phase 51.
The activation phase comprises functions to measure load of the generator set and speed of the engine, to position a droop curve using said measurements, and offsetting the droop curve to the rated speed.
It is important that the speed/frequency control of the engines works rapidly in order to keep the local power network on running. However as the load transients associated with grid trip event affect the engine's speed reference via the droop compensation. The invention disables the droop function until the load transients (at least the greatest) have passed. As the delay has expired the droop function runs. It is evident from the above that the invention is not limited to the embodiments described in this text but can be implemented in many other different embodiments within the scope of the independent claims.

Claims

Claims
1. A method of controlling an internal combustion engine in an event of disconnection of a local power network from a grid, the method comprising a phase to change a control mode of an generator set in the local power network from a kW mode to a speed droop mode, characterised in that the phase of changing from the kW mode to the speed droop mode comprises a delaying phase (51 ) that comprises parallel sub phases to disable (53) a droop function of the speed droop mode and keeping (54) a speed reference value a rated speed of an engine of the generator set, and after the delaying phase the method further comprising an activation phase (52) to enable the droop function.
2. A method according to Claim 1 , characterised in that method comprises a speed range around the rated speed having an upper and lower values (45), speed of the engine being defined to be stable if the engine speed is in the range within a stabilization time (46), the stabilization time belonging to the delaying phase (51 ).
3. A method according to Claim 1 or 2, characterised in that the activation phase (52) comprises sub phases to measure load of the generator set and speed of the engine, to position a droop curve using said measurements, and offsetting the droop curve to the rated speed.
4. A control system of an internal combustion engine comprising a main control unit (33) that in an event of disconnection of a local power network from a grid is that can be arranged to change a control mode of a generator set in the local power network from a kW mode (31 ) to a speed droop mode (32), and further comprising a speed control device (310) and a speed droop control device (31 1 ), characterised in that the system comprises a delaying unit (313) to disable a droop function of the speed droop control device (311 ) during a certain period, and a setting unit (315) to keep a speed reference value in a rated speed of an engine of the generator set during said period, which system is arranged to enable the droop function after the period.
5. A system according to Claim 4, characterised in that the speed droop control device (31 1 ) is arranged to utilize a measurement of load of the generator set and a speed measurement of the engine for positioning a droop curve using, and to offset the droop curve to the rated speed.
EP13812004.3A 2012-12-20 2013-12-17 A control system of an internal combustion engine Active EP2935843B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20126344 2012-12-20
PCT/FI2013/051171 WO2014096537A1 (en) 2012-12-20 2013-12-17 A control system of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2935843A1 true EP2935843A1 (en) 2015-10-28
EP2935843B1 EP2935843B1 (en) 2021-07-21

Family

ID=49880816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13812004.3A Active EP2935843B1 (en) 2012-12-20 2013-12-17 A control system of an internal combustion engine

Country Status (4)

Country Link
EP (1) EP2935843B1 (en)
KR (1) KR102017934B1 (en)
CN (1) CN104870787B (en)
WO (1) WO2014096537A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101825935B1 (en) 2014-09-16 2018-02-06 바르실라 핀랜드 오이 A control method and system for driving a power engine unit either in a speed control mode or in a load control mode, and changing the control mode
DE102021206419B3 (en) * 2021-06-22 2022-11-24 Rolls-Royce Solutions GmbH Control device for controlling a power arrangement comprising an internal combustion engine and a generator drivingly connected to the internal combustion engine, control arrangement with such a control device, power arrangement and method for controlling a power arrangement
DE102021206425B3 (en) * 2021-06-22 2022-11-17 Rolls-Royce Solutions GmbH Control device for controlling a power arrangement comprising an internal combustion engine and a generator drivingly connected to the internal combustion engine, control arrangement with such a control device, power arrangement and method for controlling a power arrangement

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05263687A (en) * 1992-03-23 1993-10-12 Zexel Corp Revolving speed control method of internal combustion engine
JP2003041973A (en) 2001-07-31 2003-02-13 Toyota Motor Corp Controller and control method for engine-driven generator and recording medium storing control program for engine driven generator
GB2412751B (en) * 2004-04-01 2006-05-24 Mtu Friedrichshafen Gmbh Method for controlling and regulating an IC-engine/generator unit
US7038329B1 (en) * 2004-11-04 2006-05-02 Utc Power, Llc Quality power from induction generator feeding variable speed motors
US7578658B2 (en) * 2005-01-28 2009-08-25 General Electric Company Control for integrating compressor-turbine-motor train with power grid
AT507513B1 (en) * 2007-06-20 2014-06-15 Ge Jenbacher Gmbh & Co Og STATIONARY COMBUSTION ENGINE
FI121318B (en) * 2008-12-31 2010-09-30 Waertsilae Finland Oy Method and apparatus for controlling the speed of an internal combustion engine
US8912672B2 (en) * 2009-05-20 2014-12-16 Cummins Power Generator IP, Inc. Control of an engine-driven generator to address transients of an electrical power grid connected thereto
US8219256B2 (en) * 2009-07-14 2012-07-10 Siemens Aktiengesellschaft Bang-bang controller and control method for variable speed wind turbines during abnormal frequency conditions
US9388753B2 (en) * 2009-09-17 2016-07-12 General Electric Company Generator control having power grid communications
US8768529B2 (en) * 2010-07-20 2014-07-01 General Electric Company Grid frequency rate limiting system
DE102011076073B4 (en) * 2011-05-18 2013-01-03 Mtu Friedrichshafen Gmbh Method for controlling and regulating an internal combustion engine-generator system, means for controlling and regulating the engine-generator system and land or water vehicle or stationary system for generating electrical energy

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014096537A1 *

Also Published As

Publication number Publication date
EP2935843B1 (en) 2021-07-21
CN104870787B (en) 2017-06-06
CN104870787A (en) 2015-08-26
WO2014096537A1 (en) 2014-06-26
KR20150093848A (en) 2015-08-18
KR102017934B1 (en) 2019-09-03

Similar Documents

Publication Publication Date Title
AU2007252928B2 (en) Dynamic electric brake for a variable speed wind turbine having an exciter machine and a power converter not connected to the grid
US10794364B2 (en) Method for feeding electrical power into an electric supply network
US9631608B2 (en) Wind-power-plant control upon low-voltage grid faults
EP2594005B1 (en) Power oscillation damping controller
CN103140671B (en) Wind energy turbine set and the method for running wind energy turbine set
US9506454B2 (en) Systems and methods for regulating wind turbines
CN104426155B (en) System and method for voltage control of wind generators
US20090160187A1 (en) Control system and method for operating a wind farm in a balanced state
US9899842B2 (en) Control method and control system for parallel operation between different types of power generator
CN105794067B (en) Wind power station with the improved rise time
US20090278351A1 (en) High voltage direct current link transmission system for variable speed wind turbine
EP3314741A1 (en) Sub-synchronous resonance damping
WO2009045058A2 (en) System and method for directly and instantaneously controlling exciter of generator
EP2935843B1 (en) A control system of an internal combustion engine
WO2012159678A1 (en) Power system
CN112332452A (en) Frequency control method and system for double-fed induction wind driven generator
Hassan et al. Electrical Power Quality & Utilization Magazine Volume 3, Issue 2
AU2011203021A1 (en) Dynamic Electric Brake For A Variable Speed Wind Turbine Having An Exciter Machine and a Power Converter Not Connected To The Grid

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20150512

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: WAERTSILAE FINLAND OY

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20210414

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602013078457

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1412810

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210815

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20210721

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211021

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211021

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211122

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20211022

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602013078457

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

26N No opposition filed

Effective date: 20220422

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20211217

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20211231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211217

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211217

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211231

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20131217

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20231214

Year of fee payment: 11

Ref country code: AT

Payment date: 20231221

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20210721