WO2010003469A1 - Module de commande de puissance et procédé de commande du flux d'énergie - Google Patents
Module de commande de puissance et procédé de commande du flux d'énergie Download PDFInfo
- Publication number
- WO2010003469A1 WO2010003469A1 PCT/EP2008/063082 EP2008063082W WO2010003469A1 WO 2010003469 A1 WO2010003469 A1 WO 2010003469A1 EP 2008063082 W EP2008063082 W EP 2008063082W WO 2010003469 A1 WO2010003469 A1 WO 2010003469A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- esm
- pdm
- signal
- power demand
- Prior art date
Links
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Definitions
- the present invention relates to a power control module and method for controlling energy flow in order to reduce the static and dynamic loads on a power system caused by an individual load object with predictable and/or unpredictable power fluctuations, according to the preambles of the independent claims.
- the power transmission system (also referred to as a grid) is not able to provide the demanded peak power to loads. This would cause voltage drops that are not acceptable as the voltage drops causes malfunctions or even shutting off the connected load/s. Also, the grid may not be able to respond to fast changes in power demand.
- power generation is made locally using diesel generators, steam or gas turbines.
- This type of power generation often has insufficient capacity to deliver the peak power required for loads with varying power demands such as mine hoists (winders).
- loads have frequent fast changing power demands for example when changing from continuous speed to retardation to lower speed.
- the power demand could also be negative i.e. the load regenerates power back to network which means that the total power swing is larger than the peak power demand.
- load demands are difficult to meet with local power generation.
- a solution is to install larger generating power than otherwise required which means high investment and operation cost.
- the peak demand must be met by the generators in operation, this generated power by the generators in operation is called spinning power.
- Another alternative is to install an energy storage system that provides the power above the capacity of the generating unit(s).
- Known solutions use stand- alone energy storage devices connected to the plant internal network, normally on the medium voltage level such as 6, 11 or 13.6 kV.
- the energy storage media is a flywheel/s, batteries or similar.
- Such solutions deliver power to the network when its load is high as measured by network frequency, voltage or power consumption.
- the energy storage unit recharges by taking energy back from the network.
- the present invention intends to provide a system that overcomes the above stated insufficiencies.
- a Power Control Module is arranged to control the energy flow amongst a power line, at least one Power Demanding Module (PDM) and at least one Energy Storage Module (ESM) interconnected by a DC-link, wherein the module includes:
- sensing means adapted to sense the power demand of the PDM and to generate a power demand indicating signal in response of the sensed power demand
- control means adapted to generate a control signal in response of the power demand indicating signal, that is applied to the ESM to control the energy flow between the PDM and the ESM.
- the power line is a power source with limited power, and may be any of a grid or a local power source.
- the method includes the steps of:
- the method includes the step of, if the power demand indicating signal is above a maximal power line threshold, generating a control signal being a generate power control signal (A), in order to transfer power from the ESM to the PDM.
- A power control signal
- the method further includes the steps of calculating and generating a difference signal (B) representing the difference between the power demand indicating signal and the maximal power line threshold, and further delivering the difference signal (B) to a second inverter unit (INU-2), in order to transfer the difference in power from the ESM to the PDM.
- the ESM thus supplies the difference in power to the PDM that the power line is not able to deliver.
- the method includes the step of, if the power demand signal is equal to or below the maximal power line threshold, generating a control signal being a stop generate power control signal (C), in order to make the ESM stop generating power.
- a control signal being a stop generate power control signal (C)
- the ESM stops generating power.
- the method includes the step of, if the power demand indicating signal indicates retardation, generating a control signal being a recharge control signal (D), in order to charge the ESM and thereby reducing the fast change in power demand from the power line.
- a control signal being a recharge control signal (D)
- D recharge control signal
- the method includes the step of, if the power demand indicating signal does not indicate retardation, and if a rotational speed of the PDM is low or zero, generating a control signal being a recharge control signal (D), in order to charge the ESM. Accordingly, the ESM is charged when the power demand of the PDM is low or zero, and advantageously the power withdrawn from the power line is evened out.
- the method includes the step of calculating the power demand signal from a torque reference value in a first inverter unit (INU-I) and a rotational speed of the PDM.
- INU-I first inverter unit
- the method includes the step of charging the ESM to nominal power before the PDM is started. This to ensure that the ESM is charged with enough power to be able to transfer power to the PDM if needed from the very beginning. In applications with cyclic loads, this is done without loss of time.
- FIG. 1 shows a schematic block diagram of the power control module (PCM) according to the invention connected to at least one PDM, one ESM and a power line.
- PCM power control module
- Figure 2 shows the signal flow to and from the control means.
- Figure 3 shows a flowchart of a starting procedure of a PDM, e.g. a motor that drives a hoist/lift.
- a PDM e.g. a motor that drives a hoist/lift.
- Figure 4 shows a flowchart with steps carried out when the PDM requires more power than the power line can provide.
- FIG. 5 shows a flowchart with steps carried out to charge the ESM.
- FIG. 6 shows a schematic block diagram of the power control module (PCM) connected to a PDM, an ESM and a power line in greater detail.
- PCM power control module
- Figure 7 shows a graph of the power demand of a double drum hoist without power swing reduction.
- Figure 8 shows a graph of the resulting withdrawn power from the power line when using power swing reduction.
- a power control module is arranged to control the energy flow amongst a power line, at least one power demanding module (PDM) and at least one energy storage module (ESM).
- the parts are interconnected by a DC-link, which makes it possible to reduce resulting peak power and power swing of the PDM as seen by the power line compared to prior art systems.
- a general block diagram of the structure can be seen from figure 1. It is to be understood that several ESM: s and PDM: s may be connected to the same PCM.
- the PCM further includes a sensing means adapted to sense the power demand of the PDM and to generate a power demand indicating signal in response of the sensed power demand.
- a control means is also included in the PCM, adapted to generate a control signal in response of the power demand indicating signal, which is applied to a second inverter unit (INU-2, see figure 6, denotation 11) to control the energy flow between the PDM and the ESM.
- INU-2 see figure 6, denotation 11
- Figure 2 shows the signal flow to and from the control means.
- a start signal signals to the control means to initiate a start procedure, as can be seen from figure 3.
- a maximal power line threshold indicating the maximal power output from the power line, is set manually or automatically to a desired level. Numerous signals may be sent from the control means to the second inverter unit (INU-2) to control the energy flow, and these are: Generate power control signal (A), Difference signal (B), Stop generate power control signal (C) and Recharge control signal (D). These signals are further explained below.
- the power control module includes a Voltage Source Inverter (VSI) 1 including; a first inverter unit (INU-I) 9 connected between the DC-link 8 and the PDM 2, a second inverter unit (INU-2) 11 connected between the DC-link and the ESM 3 and an Active Front End (AFE) 7 connected between the DC-link and the power line 17.
- VSI Voltage Source Inverter
- INU-I first inverter unit
- INU-2 second inverter unit
- AFE Active Front End
- the AFE converts the AC power line input into a controlled DC-link voltage. When needed, the AFE converts DC-link voltage to AC voltage to the power line.
- the performance of the PDM is thus improved, as the AFE reacts directly during e.g. load changes between motoring and regeneration and no delay time is needed.
- the PDM includes a first motor connected to a load, e.g. a hoist or winder.
- the ESM may be a flywheel energy storage including a second motor/generator and a flywheel adapted for charging and generating power.
- the motors in the system are SM/IM, (synchronous/induction motor).
- the network load caused by the peak power and power swing of the driven load is reduced by the flywheel energy storage. It is thus to be understood that several other storage/generating solutions are possible, e.g. capacitors or batteries.
- the first inverter unit (INU-I) controls the first motor connected to the load
- the second inverter unit (INU-2) controls the second motor/generator connected to the flywheel.
- the power demand signal is calculated from a torque reference value in the first inverter unit (INU-I) and a rotational speed of the PDM.
- the rotational speed is estimated from the torque reference signal.
- the maximal output from the power line is referred to as the maximal power line threshold.
- control means If the sensed power demand indicating signal is above the maximal power line threshold, the control means generates a generate power control signal (A). This signal is transferred to the second inverter unit (INU-2) which controls the motor/generator in the ESM to start generating power, in order to transfer power from the ESM to the PDM.
- INU-2 the second inverter unit
- control means in order to transfer the correct amount of power from the ESM to the PDM, is adapted to calculate and generate a difference signal (B) representing the difference between the power demand indicating signal and the maximal power line threshold.
- This difference signal (B) is delivered to the second inverter unit (INU-2), which controls the generator in the ESM to generate the difference in power, in order to transfer the generated power from the ESM to the PDM.
- INU-2 second inverter unit
- the control means is adapted to generate a stop generate control signal (C). This in order to make the ESM stop generating power when the power demand of the PDM is lowered to or below what the power line can give. In case of retardation
- the control means is then adapted to generate a recharge control signal (D), in order to charge the ESM and thereby reducing the fast change in power demand from the power line. If at retardation the PDM is regenerating power, the power has the opposite direction as when accelerating and power is transferred to the DC-link. The ESM is then charged from the PDM. If no or insufficient power is regenerated during retardation, then the ESM is charged from the power line during retardation, low speed and standstill.
- D recharge control signal
- the generated control signal is a recharge control signal (D), in order to charge the ESM.
- D recharge control signal
- the ESM is charged also after retardation in case the PDM has a low power demand or stands still. This ensures that the flywheel is charged and evens out the withdrawn power from the power line.
- the VSI 1 is connected to the power line via a circuit breaker 5 and a transformer 4.
- the circuit breaker is used for normal switching in and out as well as in case of a fault situation to trip and isolate the network load 16 and the transformer transforms the voltage from the power line to a suitable level, if required.
- the ESM is preferable initially charged to nominal power before the PDM is started, to avoid taking power from the DC-link that is needed by the PDM and to have a loaded ESM to be able to supply the PDM in case of high power demand.
- a power system 15 for a mine hoist (mine winder) as the PDM 2 is described below.
- the flywheel 3 is started at controlled acceleration charging the flywheel 3 to nominal power. Then the hoist 2 starts at set acceleration. As the speed increases, the power demand increases. Power is delivered by the power line 6 via a circuit breaker 5, a transformer 4, or other electrical equipment with similar characteristics, and the active front end 7, a DC-link 8 and a first inverter unit (ESfU-I) 9 connected to the first motor, a hoist motor 10.
- EfU-I first inverter unit
- the flywheel 14 delivers the power above that threshold.
- the power is transferred via the second inverter unit (INU-2) 11 via the DC-link 8 and the first inverter unit (INU-I) 9 to the motor 10 of the hoist machinery 12.
- the flywheel 14 stops delivering power.
- the hoist 2 starts retarding, the power demand is normally reduced sharply. At that point, it is normally optimal to start recharging the flywheel 14. If at retardation the hoist 2 is regenerating, the power for recharging has the opposite direction as at acceleration.
- the hoist motor 10 then delivers power via the first inverter unit (INU-I) 9, the DC-link 8 and the second inverter unit (INU-2) 11 to the flywheel motor 13.
- the flywheel 14 is charged by the power line 6 via the circuit breaker 5, the transformer 4, the active front end 7 and the second inverter unit (ESf U-2) 11.
- the power demand of the motor 10 is measured by the first inverter unit (INU-2) 9. Since the power through the active front end 7 and the transformer 4 is now limited to what the network 6 can supply, their sizes and power losses can be reduced.
- Fig. 7 shows a graph representing the power demand of a PDM, in this case including a double drum hoist, during a phase where the PDM is first constantly accelerating and subsequently lowers its power demand until it starts regenerating power (power demand is negative) and finally has a power demand corresponding to zero. In this case no ESM is connected.
- a graph representing the power withdrawn from the power line is shown, when the ESM is connected according to the present invention.
- the ESM supplies power to the PDM when the power demand of the PDM is above the power line threshold (in this case 6 MW).
- the ESM starts recharging (here at about 95 sec).
- the power swing is here less than half the power swing compared to the case when no ESM is used (13.2 MW) and is thus greatly reduced.
- the power step at start of retardation is also reduced, in this case from approximately 4.2 MW to 1.7 MW.
- Hoist motor (or other motor for the driven object)
- Network load Grid power line or local power generation, with limited power
Abstract
Un module de commande de puissance (PCM) est mis en place pour commander le flux d'énergie entre une ligne d'alimentation électrique, au moins un module de demande de puissance (PDM) et au moins un module de stockage d'énergie (ESM) interconnectés par une liaison c.c. Le module comprend : un moyen de détection conçu pour détecter la demande de puissance du PDM et pour générer un signal d'indication de la demande de puissance en réponse à la demande de puissance détectée, et un moyen de commande conçu pour générer un signal de commande en réponse au signal d'indication de la demande de puissance qui est appliqué au second inverseur (INU-2) pour commander le flux d'énergie entre le PDM et l’ESM.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7944408P | 2008-07-10 | 2008-07-10 | |
US61/079,444 | 2008-07-10 |
Publications (1)
Publication Number | Publication Date |
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WO2010003469A1 true WO2010003469A1 (fr) | 2010-01-14 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/EP2008/063082 WO2010003469A1 (fr) | 2008-07-10 | 2008-09-30 | Module de commande de puissance et procédé de commande du flux d'énergie |
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WO (1) | WO2010003469A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2498830A (en) * | 2011-11-11 | 2013-07-31 | Boeing Co | Controlling power transfer using rotating mass |
WO2014039424A1 (fr) * | 2012-09-04 | 2014-03-13 | Violin Memory, Inc. | Système et procédé de commande d'alimentation pour système à haute disponibilité |
US20150017273A1 (en) * | 2013-07-09 | 2015-01-15 | Wenger Manufacturing, Inc. | Steam/water static mixer injector for extrusion equipment |
WO2016131464A1 (fr) * | 2015-02-19 | 2016-08-25 | Onesubsea Ip Uk Limited | Unité d'alimentation et de commande pour dispositifs électriques d'un système de production et procédé associé |
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Title |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2498830A (en) * | 2011-11-11 | 2013-07-31 | Boeing Co | Controlling power transfer using rotating mass |
GB2498830B (en) * | 2011-11-11 | 2013-12-25 | Boeing Co | Integrated control architecture and method for a bi-directional AC-to-AC converter |
US10236817B2 (en) | 2011-11-11 | 2019-03-19 | The Boeing Company | Integrated control architecture and method for a bi-directional AC-to-AC converter |
WO2014039424A1 (fr) * | 2012-09-04 | 2014-03-13 | Violin Memory, Inc. | Système et procédé de commande d'alimentation pour système à haute disponibilité |
US9912191B2 (en) | 2012-09-04 | 2018-03-06 | Violin Systems Llc | System and method of power control for a high-availability system |
US20150017273A1 (en) * | 2013-07-09 | 2015-01-15 | Wenger Manufacturing, Inc. | Steam/water static mixer injector for extrusion equipment |
WO2016131464A1 (fr) * | 2015-02-19 | 2016-08-25 | Onesubsea Ip Uk Limited | Unité d'alimentation et de commande pour dispositifs électriques d'un système de production et procédé associé |
US20180041030A1 (en) * | 2015-02-19 | 2018-02-08 | Onesubsea Ip Uk Limited | Supply and control unit for electrical devices of a production system and method therefore |
US10916941B2 (en) | 2015-02-19 | 2021-02-09 | Onesubsea Ip Uk Limited | Supply and control unit for electrical devices of a production system and method therefore |
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