Uninterruptible power supply device for two loads having different criticality levels
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SOCOMEC SPA
- Filing Date
- 2024-08-09
- Publication Date
- 2026-07-08
Smart Images
Figure FR2024051075_06032025_PF_FP_ABST
Abstract
Description
[0001] Description
[0002] Title of the invention: Uninterruptible power supply device for two loads of different criticality levels
[0003] Technical Field
[0004] The invention relates generally to the secure power supply of electrical equipment, and more particularly to an uninterruptible power supply (UPS) device making it possible to supply two loads of different criticality levels under all circumstances.
[0005] Prior art
[0006] The electrical equipment to be powered can be of two types. Either of a type that is very sensitive to the quality of the network, in which case we will speak of critical loads. Or of a type that can accept brief power interruptions, in which case we will speak of non-critical loads.
[0007] Often likened to computer servers, critical loads cannot be powered by a network of reduced quality. That is, with voltage and frequency variations outside normal tolerances, but also a low distortion rate of the voltage wave. Critical loads are characterized above all by the fact that they cannot tolerate power interruptions, even short ones of the order of a millisecond.
[0008] Non-critical loads are generally located in the same infrastructure as critical loads, but they only concern auxiliary devices. These auxiliary devices, or non-critical loads, can accept brief power outages, i.e., longer than a millisecond, or a degradation of the network quality in voltage, frequency or distortion, without altering the overall operation of the installation, in other words without generating malfunctions.
[0009] A non-critical load could be a ventilation or air conditioning system, for example, as their thermal or mechanical inertia does not impact operation during a short power outage. The power supply tolerances applied to non-critical loads are generally wider than those applied to critical loads. Non-critical loads also tolerate greater voltage and frequency variations.
[0010] The quality level of the power supply is characterized by its voltage and frequency and its distortion rate. This quality level is good when the values are close to the nominal values and free from any deformation (distortion). The quality level of the electricity supply is characterized in standards such as 1'1 EC 62040-3 or the ITIC curve.
[0011] The secure power supplies generally used are called UPS for Uninterruptible Static Power Supply.
[0012] UPSs are generally designed to power critical loads such as data centers and hospitals, for example. In other words, any load that is likely to malfunction if the quality of the power supply degrades outside of specified tolerances.
[0013] Figure 1 shows a conventional architecture used in a UPS 1 coupled to a power supply network 2 on the one hand and to a critical load 3 to be supplied on the other hand. The UPS comprises a first AC / DC converter 4, generally called a rectifier, a second DC / AC converter 5, generally called an inverter, a static backup module 6 which is a static switch usually called a bypass 6, and a backup DC power source 7 which is generally in the form of a battery.
[0014] Both AC / DC power converters are static devices based on power electronics capable of transforming alternating voltage into direct voltage and alternating. In this use, the power converters are reversible, meaning that the energy can flow in either direction.
[0015] The conventional UPS of Figure 1 comprises a first operating mode, a second operating mode and a third operating mode. In the first operating mode, the power supply network 2 is present and a good level of power quality is required by the loads 3. In the second operating mode, the power supply network 2 is absent or of poor quality. In the first operating mode of the conventional UPS of Figure 1, the two AC / DC converters 4 and 5 operate to supply the load 3, the first AC / DC converter 4 also charges the emergency DC power source 7, and the static switch 6 is in standby, i.e. off. This first operating mode is generally referred to as “double conversion” operation.
[0016] However, the static switch 6 is ready to trip in the event of an overload greater than those specified for the other two AC / DC converters 4 and 5, or in the event of a malfunction of the latter.
[0017] In the second operating mode, also called “stand-alone” operation, the second converter 5 operates to supply the load 3 with energy from the emergency DC source 7, and the static switch 6 and the first AC / DC converter 4 are stopped.
[0018] There is also a third operating mode called "eco-mode". This third operating mode is acceptable as long as the power supply network is present and its quality level is compatible with the needs of the loads.
[0019] In the “eco-mode” operating mode, the critical load 3 is powered directly by the power supply network 2 via the static switch 6, while the emergency DC energy source 7 is recharged by the power supply network 2 via one of the AC / DC converters 4 or 5.
[0020] The second DC / AC converter 5 is switched off or possibly used for other functions such as power factor correction or harmonic compensation.
[0021] Thus, in the third operating mode of the UPS, known as "eco-mode", the critical load 3 is no longer supplied by the complete conversion chain ("double conversion") but directly by the electrical supply network via the static switch 6.
[0022] In the event of a drop in its quality, a change of operating mode takes place and the load is supplied in "double conversion" or "autonomy" depending on the level of degradation of the quality of the electrical supply, and, in the event of a power supply network 2 failure, the UPS operates in "autonomy" mode. As soon as the malfunction disappears or the quality of the network is good again, i.e. within the tolerances accepted by the loads, a new change of operating mode takes place to return to the initial power supply mode.
[0023] Thus, the known solutions do not allow for optimal and permanent use of all the energy converters, the first AC / DC converter being stopped in "autonomy" mode.
[0024] Furthermore, the power of the critical load 3 supplied by the UPS type power supply or by the energy converters 4 and 5 is only at the maximum power of the equipment, i.e. the power of the UPS. This has the consequence that these UPS architectures can only supply a single load with a power identical to that of the power supply capable of supplying it, which corresponds to the power of one of the converters 4 or 5.
[0025] Powering two loads, one critical and one non-critical, with a single secure power supply is not possible with such an architecture. Two secure UPS power supplies are required to power the critical and non-critical loads respectively.
[0026] This translates into additional direct costs, but also additional indirect costs. Furthermore, there are other disadvantages related to floor space requirements and the circular economy, which is less favourable due to the large number of components involved.
[0027] Further known from document US 6 977446 is a power supply device for a critical load using two separate inverters powered by a secondary generator. In its normal operation, the first inverter powers a critical load and the second inverter assists the power supply network to power a non-critical load. When the power supply network is faulty, the second inverter is disconnected from the secondary generator so that the secondary generator only powers the critical load, the non-critical load not being powered. When the secondary generator is faulty, the power supply network still powers the non-critical load, and, in addition, the critical load via the second inverter and the first inverter. This power supply device thus makes it possible to power two loads at the same time, a critical load and a non-critical load, but only as long as the power supply network is operating.In fact, as soon as the power supply network is faulty, only the power supply to the critical load is maintained.
[0028] Statement of the invention
[0029] The invention aims to provide a solution making it possible to supply a secure electrical power supply of a good quality level to several loads whose total power is greater than the nominal power of the power supply device which is capable of supplying them.
[0030] In a first object of the invention, an uninterruptible power supply device, UPS, is proposed, configured to ensure the simultaneous power supply of a critical load and a non-critical load, the UPS device comprising:
[0031] - a first converter, of the AC / DC type, and a second converter, of the DC / AC type, each comprising a first terminal and a second terminal, the second terminal of the first converter being connected to the first terminal of the second converter,
[0032] - a continuous energy storage source connected to the second terminal of the first converter and to the first terminal of the second converter,
[0033] - a bypass switch connected between the first terminal of the first converter and the second terminal of the second converter,
[0034] - a main input intended to be connected to a power supply network, a first output coupled to the second terminal of the second converter and intended to be connected to a critical load, and a second output coupled to the first terminal of the first converter and intended to be connected to a non-critical load.
[0035] The first AC / DC converter is an AC-DC converter, i.e., converting an AC voltage into a DC voltage, and the second DC / AC converter is a DC-AC converter, i.e., converting a DC voltage into an AC voltage. The first AC / DC converter and the second DC / AC converter can operate in the other direction when the voltage is supplied to the terminal that is usually the output terminal, and a voltage is supplied to the output terminal that is usually the input terminal.
[0036] According to a general characteristic of the invention, the UPS device comprises an electromechanical switch connected between the main input and the first terminal of the first converter, and an electronic control unit configured to monitor the variation in the amplitude of an electrical voltage signal delivered by the electrical network on the main input and to control the electromechanical switch, the first converter, the second converter, the continuous energy storage source and the bypass switch according to different operating modes as a function of a rate of variation in the amplitude of said electrical voltage signal of the supply electrical network.
[0037] The invention thus provides a secure power supply device for maintaining the simultaneous power supply of a critical load and a non-critical load by means of an electronic control unit making it possible to adapt the operation of the elements of the UPS device according to the electrical characteristics of the voltage signal of the electrical network, and also by means of an electromechanical switch controlled by the electronic control unit making it possible to disconnect the UPS device from the electrical power supply network if the voltage signal of the latter is of very poor quality.
[0038] The electronic control unit is configured to control the elements of the UPS device according to operating modes making it possible to maintain the simultaneous power supply of the critical load intended to be coupled to the first output and of the non-critical load intended to be coupled to the second output.
[0039] By controlling the electronic control unit, to change the operating mode, the electromechanical switch makes it possible to separate the first converter from the power supply network and thus to use the first converter to supply the non-critical load, and thus maintain the simultaneous supply of the critical load and the non-critical load. The change of mode is reversible.
[0040] The architecture of the invention thus ensures the quality of the energy supply in terms of voltage, frequency, harmonics and power factor for both the critical load and the non-critical load. The invention makes it possible to supply loads with a power up to twice the power of the inverter located in the UPS.
[0041] The combination of the electromechanical switch and the electronic control unit thus ensures that the power supply to both the critical and non-critical loads is maintained even in stand-alone operation. Stand-alone operation corresponds to the operation of the UPS device when it is disconnected from the power supply network because the latter is faulty.
[0042] In addition, the use of each converter is optimized to the specific power quality needs required for each load, whether critical or non-critical.
[0043] Under normal operating conditions of a UPS conventionally known in the state of the art, not all converters, AC / DC and DC / AC, always operate. In the UPS device according to the invention, all converters, AC / DC and DC / AC, are active in stand-alone mode and can even be assigned to functions different from their usual use in certain other operating modes, the aim being to increase the power and quality of the electricity supply.
[0044] Thus, compared to the state of the art, the control logic implemented by the electronic control unit offers a technical solution making it possible to reduce the number of UPS type equipment by half or to halve the power, which in both cases represents a significant gain.
[0045] The electronic control unit can be a power management system.
[0046] In a first embodiment of the UPS device, the electronic control unit may comprise means for measuring the electrical voltage intended to be delivered to the main input of the UPS device and comparison means, the measuring means comprising at least one module for determining the rate of variation of amplitude of the electrical voltage signal, and the comparison means comprising a module for comparing the rate of variation of amplitude of the electrical voltage signal to a first threshold of rate of variation of amplitude corresponding to the minimum quality required for the supply of a critical load, to a second threshold of rate of variation of amplitude corresponding to the minimum quality required for the supply of a non-critical load, and to a third threshold of rate of variation of amplitude corresponding to the minimum quality required for the supply of the first converter,the second rate of change threshold being greater than the first rate of change threshold and the third rate of change threshold being greater than the second rate of change threshold.,
[0047] In other words, each rate of variation threshold corresponds to a threshold of voltage quality required for the electrical voltage signal delivered by the electrical network, the first rate of variation threshold being the most restrictive, and the third being the least restrictive.
[0048] The first rate of change threshold corresponds to a threshold above which the quality of the voltage signal is not sufficient to supply a critical load without improvement. The second rate of change threshold corresponds to a threshold above which the quality of the voltage signal is not sufficient to supply a non-critical load without improvement. The third rate of change threshold corresponds to a threshold above which the quality of the voltage signal is no longer sufficient for the first AC / DC converter to operate.
[0049] The electronic control unit is configured to measure the voltage and current delivered by the power supply network at any time and to ensure the control of the various components of the UPS device according to the electrical characteristics of the power supply network. The configuration of the electronic control unit makes it possible to maintain a power supply of sufficient quality and intensity for a critical load during degraded operation, for example following a short circuit or prolonged overloads beyond the powers defined for the equipment. It also makes it possible to manage the energy transition to avoid, in particular, the reinjection of energy into the input power network when this is not authorized.
[0050] Based on measurements of the characteristics of the electrical voltage signal of the electrical power supply network, the electronic control unit of the invention makes it possible to control each of the energy converters, AC / DC and DC / AC, to the specific power quality needs required for each of the loads, whether critical or non-critical. The electronic control unit is thus a supervision system playing an essential role in the different operating modes. It is responsible for collecting all the current and voltage information at several points in the system (network, converters, outputs) and optimally controlling all the equipment to provide the best possible quality energy to the different loads according to the capacities of the input networks and the state of the continuous energy source.
[0051] The network voltage measurements taken by the electronic control unit are interpreted by calculating instantaneous values and effective values in order to characterize them in relation to the network quality levels.
[0052] This quality level is defined in standards. The system allows these quality requirements to be configured to match the actual needs of the loads and thus select the operating modes according to the optimal level required for each of the loads supplied, critical and non-critical.
[0053] These quality levels are fully configurable and can therefore be adjusted as closely as possible to the actual needs of each load.
[0054] Some non-critical loads can in particular accept longer cuts of the order of fifty milliseconds and also accept wider voltage tolerances of the order of + / - 20% for example.
[0055] The specific algorithms of the electronic control unit therefore allow this optimal management of the choice of the most optimized operating mode according to the measurements of the network quality and also to ensure the transitions between the different operating modes.
[0056] In a second embodiment of the UPS device, the UPS device may include a nominal operating mode (NOM) in which the electromechanical switch is closed, the bypass switch is closed, and the first converter and the second converter are in standby.
[0057] In the nominal operating mode the continuous energy storage source does not deliver any current.
[0058] Preferably, the nominal operating mode (MN) is activated by the electronic control unit when the electrical voltage signal measured by the electronic control unit on the main input has a rate of variation of amplitude of the electrical voltage signal lower than the first rate of variation threshold.
[0059] In the nominal operating mode (NOM) of the UPS device, both loads, i.e. the critical load intended to be coupled to the first output and the non-critical load intended to be coupled to the second output, are supplied directly and only by the power supply network via the main input as long as the latter has a sufficient quality level.
[0060] In other words, when the first AC / DC converter and the second DC / AC converter are in standby mode, they are controlled by the electronic control unit not to deliver current to the first output and to the second output.
[0061] In a third embodiment of the UPS device, the UPS device may include an enhanced nominal operating mode (ENOM) in which the electromechanical switch is closed, the bypass switch is closed, and the second converter operates in a power factor improvement mode. The power factor improvement allows, in particular, to have a current waveform closer to a sinusoid and to reduce the phase shift between the voltage signal and the current signal.
[0062] Preferably, the electronic control unit activates the enhanced nominal operating mode (ENOM), and thus the power factor improvement mode for the second converter, when the critical load coupled to the first output degrades the current waveform on the main input beyond a first current waveform quality level.
[0063] In this variant, the DC energy storage source can be kept charged by one of the two AC / DC converters.
[0064] In a variation of the enhanced nominal operating mode (ENOM), the first converter may also operate in a power factor improvement mode. Thus, the first converter and the second converter may each operate in a power factor improvement mode. Preferably, the electronic control unit activates the power factor improvement mode for each of the first and second converters when the critical load to be coupled to the first output and the non-critical load to be coupled to the second output degrade the current waveform on the main input beyond a second current waveform quality level.
[0065] In this variant, the DC energy storage source can be kept charged by one of the two AC / DC converters.
[0066] In the improved nominal operating mode (ENM) where the two converters operate in a power factor improvement mode, the first AC / DC converter and the second DC / AC converter operate in parallel thanks to the bypass switch and thus together contribute to the improvement of the network quality in terms of power factor and harmonic compensation. This embodiment thus makes it possible to overcome a degradation of the current waveform caused by the loads coupled to the outputs of the UPS device. This operating mode makes it possible to have an improved current waveform in terms of quality for both the non-critical load and the critical load.
[0067] Preferably, the electronic control unit can activate the charging of the energy storage source during the control step, when the charge level of the DC energy storage source is below a charge threshold. For example, this is referred to as nominal or enhanced nominal operation with charging of the DC energy storage source. In the nominal mode, the first converter and / or the second converter simply operates to rectify the current and feed it into the DC energy storage source.
[0068] In a fourth embodiment of the UPS device, the UPS device may further include a degraded grid (MD) operating mode of the UPS device in which the electromechanical switch is closed, the bypass switch is open, and the first AC / DC converter and the second DC / AC converter operate together in a double conversion mode. In this embodiment, the DC energy storage source may be maintained under load by the first AC / DC converter.
[0069] Preferably, the degraded network operating mode (MD) is activated by the electronic control unit when the electrical voltage signal measured by the electronic control unit on the main input has an amplitude variation rate greater than the first amplitude variation rate threshold but less than the second amplitude variation rate threshold.
[0070] In this degraded network operating mode (MD), the second output is intended to be powered by the supply electrical network via the main input, and the first output is intended to be powered by an improved quality voltage resulting from the successive passage of the supply electrical network voltage signal through the first AC / DC converter and then the second DC / AC converter. This degraded network operating mode makes it possible to maintain optimal efficiency and preserve the continuous energy storage source.
[0071] In a variant of the degraded grid (MD) operating mode, the first AC / DC converter may additionally operate in a power factor improvement mode.
[0072] Preferably, in the degraded grid operating mode, the electronic control unit activates the power factor improvement mode for the first converter when the critical load to be coupled to the first output and / or the non-critical load to be coupled to the second output degrade(s) the current waveform beyond a second current waveform quality level.
[0073] In operating modes with a power supply network, the critical load is powered by the power network via the bypass switch or via the first and second AC / DC converters (double conversion). The non-critical load is powered by the power network via the electromechanical switch. Therefore, the total power of the loads is indeed twice that of the AC / DC converters that make up the UPS system.
[0074] In operating modes with a power supply network, the architecture of the invention makes it possible to have at least one of the converters used for other functions such as recharging the continuous energy storage source, or improving the quality of the network in terms of power factor and harmonic compensation. It is therefore possible to assign certain functions to one of the two converters and / or the others to the other converter.
[0075] In a fifth embodiment of the UPS device, the UPS device may include an autonomous mode of operation (AM) in which the electromechanical switch is open, and the DC energy storage source delivers a DC current to the first converter and the second converter. The voltage delivered by the energy storage source is a DC voltage.
[0076] Preferably, the autonomous operating mode (MA) is activated by the electronic control unit when the electrical voltage measured by the electronic control unit on the main input has an amplitude variation rate greater than the third amplitude variation rate threshold.
[0077] Thus, in the autonomous operating mode (MA), the first output is intended to be powered by the continuous energy storage source via the second DC / AC converter, and the second output is intended to be powered by the continuous energy storage source via the first AC / DC converter.
[0078] The electronic control unit is configured to control the electromechanical switch and thus allow the UPS device to be disconnected or connected from the power supply network. This disconnection allows the first converter to be used no longer in rectifier mode but in inverter mode and thus contribute to the power supply of the non-critical load in standby mode, i.e. in the absence of input supply voltage. The operation of the first converter sometimes in rectifier mode and sometimes in inverter mode implies that its design is completely reversible at the topology level but also at the level of its control algorithms. This change of operating mode of the first converter is done under the control of the electronic control unit.
[0079] The electronic control unit is also responsible for reconnecting the equipment to the input power grid as soon as the supply quality is again within the minimum tolerances required for the non-critical load or even those required for the critical load. In this case, the electronic control unit modifies the operating mode of the UPS device to return to one of the operating modes with the power grid present, in line with the needs of the loads and the quality of the power grid.
[0080] In the autonomous operating mode (MA) according to the invention, the first AC / DC converter, which is usually switched off during the autonomous phase of devices known from the state of the art, is now responsible for supplying at least the non-critical load with a good quality regulated voltage. The device thus makes it possible to supply twice as much load as initially planned without this innovation.
[0081] Additionally, in this Autonomous Operation Mode (AO), the bypass switch can be opened or closed:
[0082] - when the bypass switch is open, the non-critical load is supplied by a good quality regulated voltage from the first AC / DC converter and the critical load is supplied by a good quality regulated voltage from the second DC / AC converter, both AC / DC converters being supplied by the same DC energy storage source;
[0083] - when the bypass switch is closed, the first AC / DC converter and the second DC / AC converter operate in parallel to supply the non-critical load and the critical load; thus the power supply is even better secured by the redundancy of the converters.
[0084] In a sixth embodiment of the UPS device, the UPS device may further comprise an electromechanical load shedding switch, the second output of the UPS device being connected to the first terminal of the first converter via the electromechanical load shedding switch.
[0085] The electronic control unit can command the opening of the electromechanical load shedding switch to cut off the power supply to the non-critical load in two cases.
[0086] A first case, when the electrical voltage measured by the electronic control unit on the main input has an amplitude variation rate greater than the second amplitude variation rate threshold but less than the third amplitude variation rate threshold, the first output, intended to supply the critical load, being intended to be supplied by an electrical voltage signal of improved quality resulting from the successive passage of the electrical voltage signal from the electrical supply network through the first AC / DC converter then the second DC / AC converter. In this first case, the DC voltage source is maintained under load via the first converter, and the non-critical load is disconnected because its voltage is incompatible with that of the network.
[0087] A second case, while the UPS was already operating in an autonomous mode, when the power supply of the critical load in autonomy must be extended, the first output intended to supply the critical load being supplied by the continuous energy storage source via the second DC / AC converter.
[0088] In both cases, the electromechanical load shedding switch thus allows the electronic control unit to exit the operating modes allowing the simultaneous supply of a non-critical load and a critical load, and thus offers two additional operating modes, one when the quality of the network is insufficient for the non-critical load and the other to increase the duration of supply of the critical load in autonomy.
[0089] In other words, the electromechanical load shedding switch offers the possibility of optimizing the availability of the continuous energy source by shedding the non-critical load, which allows the continuous energy source to be fully used for the critical load.
[0090] In all operating modes in which at least one of the converters is operating, at least one of the converters can supply power to the continuous energy storage means to keep it charged.
[0091] In another embodiment of the UPS device, the bypass switch may be a static switch or an electromechanical switch.
[0092] In a seventh embodiment of the UPS device, the UPS device may further comprise a short-circuit protection device, such as a fuse, the second output of the UPS device being connected to the first terminal of the first converter via the short-circuit protection device.It is also proposed, according to another object of the invention, a method for controlling the uninterruptible static power supply device as defined above to ensure the simultaneous power supply of a critical load connected to the first output of the UPS device and a non-critical load connected to the second output of the UPS device even when the power supply network is faulty, the method comprising a monitoring step for monitoring the variation in the amplitude of the power supply voltage signal delivered by the power supply network on the main input and a control step for controlling the electromechanical switch, the first AC / DC converter, the second DC / AC converter, the continuous energy storage source and the bypass switch according to operating modes of the UPS device as a function of a rate of variation in the amplitude of said power supply voltage signal of the power supply network.
[0093] In one embodiment of the control method according to the invention, the monitoring step may comprise a measurement of the electrical voltage signal on the main input of the UPS device, a determination of the amplitude variation rate of the electrical voltage signal to determine the quality level of the voltage signal, and a comparison of the amplitude variation rate of the electrical voltage signal to a first amplitude variation rate threshold corresponding to the minimum quality required for supplying a critical load, to a second amplitude variation rate threshold corresponding to the minimum quality required for supplying a non-critical load, and to a third amplitude variation rate threshold corresponding to the minimum quality required for supplying the first AC / DC converter,the second rate of change threshold being greater than the first rate of change threshold and the third rate of change threshold being greater than the second rate of change threshold.,
[0094] The control step may include activation of the different modes depending on the results of the comparison as indicated above and below.
[0095] Preferably, the control step may comprise, depending on the comparison results, an activation of a very degraded network operating mode (MDD) in which a controlled electromechanical load shedding switch connected to the second output is opened to disconnect the non-critical load from the UPS device, the very degraded network operating mode being selected by the electronic control unit when the electrical voltage signal measured by the electronic control unit on the main input has an amplitude variation rate greater than the second amplitude variation rate threshold but less than the third amplitude variation rate threshold.
[0096] In a second embodiment of the control method according to the invention, the control step may comprise, depending on the comparison results, an activation of an autonomous operating mode (MA) in which the electromechanical switch is open to disconnect the UPS device from the electrical supply network intended to be coupled to the main input, and the continuous energy storage source is controlled to deliver a direct current to the first AC / DC converter and to the second DC / AC converter, the autonomous operating mode being selected by the electronic control unit when the electrical voltage signal measured by the electronic control unit on the main input has an amplitude variation rate greater than the third amplitude variation rate threshold.
[0097] Preferably, the control step may comprise an activation of an extended autonomy operating mode (MAD) in which a controlled electromechanical load shedding switch connected to the second output is opened to disconnect the non-critical load from the UPS device, the extended autonomy operating mode being selected by the electronic control unit when the level of continuous energy stored in the continuous energy storage source falls below an energy level threshold. The extended autonomy operating mode thus corresponds to an autonomous operating mode in which the non-critical load is shed.
[0098] Brief description of the drawings
[0099] The invention will be better understood from the reading below, for informational but non-limiting purposes, with reference to the attached drawings.
[0100] [Fig. 1] Figure 1, already described, represents a classic architecture used in a static uninterruptible power supply according to the state of the art.
[0101] [Fig. 2] Figure 2 schematically shows an electrical architecture of an uninterruptible power supply device according to the invention. [Fig. 3] Figure 3 schematically shows the electronic control unit of the UPS device of Figure 2.
[0102] [Fig. 4] Figure 4 schematically represents the operation of the UPS device in the nominal operating mode.
[0103] [Fig. 5] Figure 5 schematically represents the operation of the UPS device in the enhanced nominal operating mode.
[0104] [Fig. 6] Figure 6 schematically represents the operation of the UPS device in the degraded network operating mode.
[0105] [Fig. 7] Figure 7 schematically represents the operation of the UPS device in the operating mode for very degraded network.
[0106] [Fig. 8] Figure 8 schematically represents the operation of the UPS device in a first autonomous operating mode.
[0107] [Fig. 9] Figure 9 schematically represents the operation of the UPS device in a second autonomous operating mode.
[0108] [Fig. 10] Figure 10 schematically represents a logic diagram of a method for controlling the UPS device of Figure 2 according to an embodiment of the invention.
[0109] [Fig. 1 1 ] Figure 1 1 shows an example of a flowchart for activating the different operating modes of the API device 10 of Figure 2.
[0110] Description of the embodiments
[0111] The present invention will be described in connection with particular embodiments and with reference to certain drawings, but the invention is not limited thereto, but only by the claims. The drawings described are schematic only and are not limiting. In the drawings, the size of some of the elements may be exaggerated and not drawn to scale for the purpose of illustration. When the term "comprising" is used in this description and the claims, it does not exclude other elements or steps. When an indefinite or definite article is used to denote a singular noun, e.g., "a" or "an," "the," or "the," this may include a plural of that noun, unless otherwise indicated. The term "comprising," as used in the claims, should not be construed as being limited to the means listed below; it does not exclude other elements or steps.Thus, the scope of the expression "a device comprising means A and B" should not be limited to devices consisting only of components A and B. This means that, in relation to the present invention, the only relevant components of the device are A and B.
[0112] Furthermore, the terms first, second, third and the like in the description and claims are used to distinguish like elements and not necessarily to describe a sequential or chronological order. It is to be understood that the terms so used are interchangeable in appropriate circumstances and that the embodiments of the invention described herein are capable of operation in sequences other than those described or illustrated herein.
[0113] The present invention relates to an uninterruptible power supply device.
[0114] Figure 2 schematically shows an uninterruptible power supply (UPS) device 10 according to one embodiment of the invention. The UPS device 10 is configured to provide simultaneous power to a critical load and a non-critical load regardless of the electrical characteristics of the power supply network supplying the UPS device 10.
[0115] The UPS device 10 comprises a main input 11, a first output 12, a second output 13, a first AC / DC converter 14 and a second DC / AC converter 15, a bypass switch 16, a continuous energy storage source 17, a main electromechanical switch 18, an electromechanical load shedding switch 19, an electronic control unit 20, and a protection device 21, for example a fuse.
[0116] When the UPS device 10 is used on an installation with a power supply network and loads to be supplied, the main input 11 is connected to an electrical power supply network 30, the first output 12 is connected to a critical load 31 and the second output 13 is connected to a non-critical load 32.
[0117] The first AC / DC converter 14 and the second DC / AC converter 15 each comprise a first terminal and a second terminal, denoted respectively 141 and 142 for the first AC / DC converter 14, and 151 and 152 for the second DC / AC converter 15.
[0118] The first terminal 141 of the first converter 14 is connected to a first electrical node 140. The first electrical node 140 is also connected to the main input 11 via the main electromechanical switch 18, to the first output 12 via the bypass switch 16, and to the second output 13 via the protection device 21 and the load shedding electromechanical switch 19.
[0119] The bypass switch 16 is mounted on a bypass branch 160 coupling the first electrical node 140 to the first output 12. Thus, the first terminal 141 of the first converter 14 is connected to the second terminal 152 of the second converter 15 via the bypass branch 160. The bypass branch 160 thus makes it possible, when the bypass switch 16 is closed, to route the current from the supply electrical network 30, for example, directly to the critical load 31.
[0120] The second terminal 142 of the first AC / DC converter 14 is connected to the first terminal 151 of the second DC / AC converter 15 via a second electrical connection node 170 which is also connected to the DC energy storage source 17. The DC energy storage source 17 is thus connected to the second terminal 142 of the first AC / DC converter 14 and to the first terminal 151 of the second DC / AC converter 15.
[0121] The main electromechanical switch 18 connected between the main input 11 and the first electrical node 140 forms a means of connecting and disconnecting the electrical supply network 30 depending on the quality of the electrical supply network 30.
[0122] The electronic control unit 20 is configured to monitor the electrical voltage signal delivered by the electrical supply network 30 on the main input 11, more particularly by monitoring the amplitude variation rate T of said electrical voltage signal, and to control each of the components of the UPS device 10, i.e. in particular the main electromechanical switch 18, the first AC / DC converter 14, the second DC / AC converter 15, the continuous energy storage source 17, the electromechanical load shedding switch 19, and the bypass switch 16 according to operating modes of the UPS device 10 as a function, in particular, of the quality of the electrical supply network.
[0123] 30, in other words as a function of the rate of variation of amplitude of said electrical voltage signal of the electrical supply network 30. The connections between each of said components of the UPS device and the electronic control unit 17 are represented in dotted lines.
[0124] As illustrated in Figure 3 which schematically represents the electronic control unit 20 of the UPS device 10 of Figure 2, to monitor the state of the electrical supply network 30 at the main input 11, the electronic control unit 20 comprises means 210 for measuring the electrical voltage signal delivered by the electrical supply network 30 to the main input 11 and comparison means 220. The measuring means 210 comprise at least one module 214 for determining the rate of variation of amplitude of the electrical voltage signal. The comparison means 220 comprise a module 224 for comparing the rate of variation of amplitude T of the electrical voltage signal to a first threshold of rate of variation of amplitude Si, to a second threshold of rate of variation of amplitude S2, and to a third threshold of rate of variation of amplitude S3.The first threshold of amplitude variation rate Si corresponds to the minimum quality required for the supply of a critical load.
[0125] 31. The second amplitude variation rate threshold S2 corresponds to the minimum quality required for the power supply of a non-critical load 32. The third amplitude variation rate threshold S3 corresponds to the minimum quality required for the power supply of the first converter 14. The second variation rate threshold S2 is greater than the first variation rate threshold Si and the third variation rate threshold S3 is greater than the second variation rate threshold S2.
[0126] Figure 4 shows schematically the operation of the UPS device 10 of Figure 2 in a nominal operating mode, denoted MN in Figure 11. The diagram has been simplified to facilitate its reading, in particular by removing the connections between the components of the UPS device 10 and the electronic control unit 20, and by highlighting in bold the connections through which a voltage and current signal passes.
[0127] As illustrated in Figure 4, in the nominal operating mode of the UPS device 10, the electromechanical switch 18 is closed, the bypass switch 16 is closed, the first AC / DC converter 14 and the second DC / AC converter 15 are in standby, and the DC energy storage source 17 does not deliver any current.
[0128] Thus, as illustrated by thick lines in Figure 4, the first output 12 and the second output 13 are powered directly and only by the electrical supply network 30 via the main input 11. In other words, the critical load 31 and the non-critical load 32 are powered directly by the electrical network 30 as long as the latter has a sufficient level of quality, the critical load 31 being powered by a voltage signal passing through the bypass branch 160.
[0129] The nominal operating mode is selected by the electronic control unit 20 when the electrical voltage signal measured by the electronic control unit 20 on the main input 11 has a rate of variation of amplitude of the electrical voltage signal lower than the first rate of variation threshold Si.
[0130] From this nominal operating mode of the UPS device 10, a user or an automated system can command the first AC / DC converter 14 and / or the second DC / AC converter 15 to come out of standby and operate to supply the DC energy storage source 17 with DC current and thus recharge it. This option can be activated automatically or manually when the charge level of the DC energy storage source 17 is below a charge threshold.
[0131] In Figure 5 is schematically illustrated the operation of the UPS device 10 of Figure 2 in an improved nominal operating mode, denoted MNA in Figure 11.
[0132] As illustrated in Figure 5, in the enhanced nominal operating mode MNA of the UPS device 10, the electromechanical switch 18 is closed, the bypass switch 16 is closed, and the first AC / DC converter 14 and the second DC / AC converter 15 are both operating in a power factor improvement mode.
[0133] In a variant of the improved nominal operating mode MNA, only one of the two converters can operate in a power factor improvement mode, the other being able to be in standby or used only to maintain the continuous energy storage source 17 under load.
[0134] Thus, as illustrated by the thick lines in Figure 5, the first output 12 and the second output 13 are thus powered by an electrical voltage signal from the electrical supply network 30 coupled to the main input 11 and the current waveform results from the current signal from the supply network and the shape of which is modulated both by the critical load 31, the non-critical load 32, as well as the first AC / DC converter 14 and the second DC / AC converter 15.
[0135] In other words, the first AC / DC converter 14 and the second DC / AC converter 15 operate in parallel thanks to the bypass switch 16 and thus together contribute to improving the quality of the current in terms of power factor and harmonic compensation.
[0136] As illustrated in Figure 11 which illustrates an example of a flowchart for activating the different operating modes of the UPS device 10 of Figure 2, the improved nominal operating mode MNA is selected by a user instead of the nominal operating mode MN if he knows that the critical load risks degrading the current waveform. In a variant, this improved nominal operating mode MNA can also be selected by the electronic control unit 20 when the critical load 31 coupled to the first output 12 degrades the current waveform beyond a first current waveform quality level.
[0137] This embodiment thus makes it possible to compensate for a drop in the quality of the current waveform below the first waveform quality level which could then impact the operation of other loads coupled to the electrical supply network 30. This operating mode makes it possible to have an improved current in terms of quality both for the non-critical load 32 and for the critical load 31.
[0138] From this enhanced nominal operating mode MNA of the UPS device 10, a user or an automated system can control the first AC / DC converter 14 and / or the second DC / AC converter 15 to come out of standby if it was and operate to supply the DC energy storage source 17 with DC current and thus recharge it. This option can be activated automatically or manually when the charge level of the DC energy storage source 17 is below a charge threshold.
[0139] Figure 6 shows schematically the operation of the UPS device 10 of Figure 2 in a degraded network operating mode, noted MD in Figure 11.
[0140] As illustrated in Figure 6, in the MD degraded grid operation mode of the UPS device 10, the electromechanical switch 18 is closed and the bypass switch 16 is open, and the first AC / DC converter 14 and the second DC / AC converter 15 operate together in a double conversion mode.
[0141] Thus, as illustrated by the thick lines in Figure 6, the second output 13 is powered by the electrical supply network 30 via the main input 11, and the first output 12 is powered by an electrical voltage signal of improved quality resulting from the successive passage of the electrical voltage signal from the electrical supply network 30 through the first AC / DC converter 14 and then the second DC / AC converter 15. In other words, the non-critical load 32 is powered directly by the electrical supply network 30, while the critical load 31 is powered by an electrical voltage signal from the electrical supply network 30 and improved by virtue of its successive passage through the first AC / DC converter 14 and then the second DC / AC converter 15.
[0142] As illustrated in FIG. 11, the operating mode for degraded network MD can be selected by a user instead of the nominal operating mode MN or the improved nominal operating mode MNA as soon as the UPS device 10 is started up. In a variant, the electronic control unit 20 can select this operating mode for degraded network MD, and in particular command a change from the nominal operating mode MN to the operating mode for degraded network MD, when the electrical voltage signal measured by the electronic control unit 20 on the main input 11 has an amplitude variation rate T greater than the first amplitude variation rate threshold Si but less than the second amplitude variation rate threshold S2.
[0143] This mode of operation allows optimal efficiency to be maintained and the continuous energy storage source 17 to be preserved.
[0144] In this MD degraded network operating mode of the UPS device 10, a user or an automated system can control the first AC / DC converter 14 to supply the DC energy storage source 17 with DC current and thus recharge it. This option can be activated automatically or manually when the charge level of the DC energy storage source 17 is below a charge threshold.
[0145] In this operating mode for degraded network MD, the electronic control unit 20 can control the first AC / DC converter 14 to operate, in addition, in a power factor improvement mode. In Figure 11, this variant of the degraded operating mode corresponds to an improved degraded operating mode, denoted MDA.
[0146] In other words, in the improved degraded network operating mode MDA, the electronic control unit activates the power factor improvement mode for the first AC / DC converter 14 when the critical load intended to be coupled to the first output and / or the non-critical load intended to be coupled to the second output degrade(s) the current waveform beyond a second current waveform quality level.
[0147] Thus, in the operating mode for improved degraded network MDA, the critical load 31 is supplied by double conversion, while the critical load 31 is supplied via a current from the electrical network 30 whose power factor is improved by the first AC / DC converter 14.
[0148] In the operating mode for degraded network MD or the operating mode for improved degraded network MDA, the current delivered by the first AC / DC converter 14 on its second terminal 142 can be used to maintain the continuous energy storage source 17 in charge when the charge level of the continuous energy storage source is below a charge threshold. In Figure 7 is shown schematically the operation of the UPS device 10 of Figure 2 in an operating mode for a very degraded network, noted MDD in Figure 11.
[0149] As illustrated in Figure 7, the very degraded network operating mode MDD of the UPS device 10 differs from the degraded network operating mode MD shown in Figure 6 in that the electromechanical load shedding switch 19 is open.
[0150] Until now, in all the operating modes presented, nominal MN, improved nominal MNA, or for degraded network MD or MDA, the electromechanical load shedding switch 19 was closed to allow the supply of the non-critical load 32 connected to the second output 13.
[0151] As illustrated in Figure 7 by the thick lines, in this operating mode for a very degraded MDD network, the electrical voltage signal from the electrical distribution network 30 is delivered only to the critical load 31 after passing through the first AC / DC converter 14 then the second DC / AC converter 15.
[0152] The operating mode for a very degraded network is selected by the electronic control unit 20 when the electrical voltage signal measured by the electronic control unit 20 on the main input 11 has an amplitude variation rate T greater than the second amplitude variation rate threshold S2 but less than the third amplitude variation rate threshold S3, the first output being intended to be supplied by a current of improved quality resulting from the successive passage of the electrical voltage signal from the electrical supply network through the first AC / DC converter 14 then the second DC / AC converter 15.
[0153] Figure 8 schematically illustrates the operation of the UPS device 10 of Figure 2 in an autonomous operating mode, noted MA in Figure 11.
[0154] As illustrated in Figure 8, in the MA stand-alone operating mode of the UPS device 10, the electromechanical switch 18 is open, and the DC energy storage source 17 delivers energy to the circuit. Tl
[0155] Thus, as illustrated by the thick lines in Figure 8, the critical load 31 is powered via the first output 12 by a current delivered by the DC energy storage source 17 through the second DC / AC converter 15, and the non-critical load 32 is powered via the second output 32 by a current delivered by the DC energy storage source 17 through the first AC / DC converter 14.
[0156] Figure 9 schematically illustrates the operation of the UPS device 10 of Figure 2 in an extended autonomy operating mode, noted MAD in Figure 11.
[0157] As illustrated in Figure 9, in the extended autonomy operating mode MAD of the UPS device 10, the electromechanical switch 18 is open, the electromechanical load shedding switch 19 is open, and the continuous energy storage source 17 delivers energy to the circuit.
[0158] Thus, as illustrated by the thick lines in Figure 9, only the critical load 31 is powered via the first output 12 by a current delivered by the DC energy storage source 17 through the second DC / AC converter 15.
[0159] The electronic control unit 20 selects the MA autonomy operating mode or the MAD extended autonomy operating mode when the electrical voltage signal measured by the electronic control unit 20 on the main input 11 has an amplitude variation rate T greater than the third amplitude variation rate threshold S3.
[0160] As illustrated in Figure 11, the MA autonomy operating mode and the MAD extended autonomy operating mode can also be selected by a user when the electrical voltage signal measured on the main input 11 has an amplitude variation rate T greater than the second amplitude variation rate threshold S2 but less than the third amplitude variation rate threshold S3.
[0161] Figure 10 shows a flowchart of an example of a method for controlling the UPS device 10 of Figure 2 according to an embodiment of the invention. The method for controlling the UPS device of Figure 2 is configured to ensure the simultaneous power supply of the critical load 31 connected to the first output 12 and the non-critical load 32 connected to the second output 13 regardless of the electrical characteristics of the electrical supply network 30.In other words, the control method allows the electronic control unit 20 of the UPS device 10 to permanently maintain the power supply to the critical load 31 on the first output 12 and the power supply to the non-critical load 32 on the second output 13, whether the current and voltage delivered by the electrical supply network 30 on the main input 30 is of sufficient intensity and quality for the levels required by the critical load 31, of insufficient quality for the critical load 31 or the non-critical load 32, or even whether the electrical supply network 30 is faulty, forcing the UPS device 10 to operate autonomously.
[0162] The control method comprises a monitoring step 900 for monitoring the electrical voltage signal delivered by the electrical supply network 30 on the main input 11 and a control step 920 for controlling the electromechanical switch 18, the first AC / DC converter 14, the second DC / AC converter 15, the DC energy storage source 17 and the bypass switch 16 according to operating modes of the UPS device 10 as a function of the quality of the electrical supply network 30, i.e. as a function of the amplitude variation rate T of the electrical voltage signal.
[0163] The monitoring step 900 preferably comprises a step 902 of measuring the electrical voltage signal delivered to the main input 11 of the UPS device 10 by the electrical supply network 30, a step 904 of determining the amplitude variation rate of the electrical voltage signal to determine the quality level of the electrical voltage signal delivered to the main input 11 by the electrical supply network 30, then a step 908 of comparing the determined amplitude variation rate T with a first threshold of amplitude variation rate Si corresponding to the minimum quality required for the critical load 31, with a second threshold of amplitude variation rate S2 corresponding to the minimum quality required for the non-critical load 32, and with a third threshold of amplitude variation rate S3 corresponding to the minimum quality required for the power supply of the first AC / DC converter 14,the second amplitude variation rate threshold S2 being greater than the first amplitude variation rate threshold Si and the third amplitude variation rate threshold S3 being greater than the second amplitude variation rate threshold S3.,
[0164] The monitoring step 900 is carried out regularly during the operation of the UPS device 10 by the electronic control unit 20 to determine the operating mode in which the UPS device 10 must be placed to have the most suitable operation to maintain the simultaneous power supply of the critical load 31 and the non-critical load 32.
[0165] Depending on the results of the comparisons of the monitoring step 900, the control step 920 therefore comprises an activation of one of the operating modes of the UPS device 10 mentioned above. The activation mode is chosen by the user or by the electronic control unit 20 from among the nominal operating mode MN, the improved nominal operating mode MNA, the operating mode for degraded network MD, the improved operating mode for degraded network MDA, the operating mode for very degraded network MDD, and the autonomous operating mode MA in the case where the electrical supply network 30 is faulty, or the extended autonomous operating mode MAD.
[0166] In certain modes, the electronic control unit 20 can also activate a charging option for the continuous energy storage source 17 when its charge level requires it and the activated operating mode allows it. The charging option can be activated in all modes in which the electromechanical switch 18 is closed to connect the UPS device to the power supply network 30. In other words, the charging option can be activated for all modes except for the MA autonomy operating mode and the MAD extended autonomy operating mode.
[0167] Furthermore, the electronic control unit 20 can activate a safety mode in two cases so that the UPS device 10 exits its conventional control method to maintain the simultaneous power supply of the critical load 31 and the non-critical load 32, and thus only power the critical load 31. For this, the electronic control unit 20 controls the opening of the electromechanical load shedding switch 19, in the following two cases: - when the amplitude variation rate of the electrical voltage signal determined by the electronic control unit 20 is greater than the second amplitude variation rate threshold S2, the first output 12 being intended to be powered by an electrical voltage signal of improved quality resulting from the successive passage of the electrical voltage signal of the electrical supply network 30 by the first AC / DC converter 14 then the second DC / AC converter 15, as illustrated in FIG. 7, and
[0168] - when the power supply of the critical load in autonomy MA must be extended, the first output 12 intended to supply the critical load 31 being supplied by the continuous energy storage source 17 via the second DC / AC converter 15, as illustrated in figure 9.
[0169] Figure 11 illustrates an example of use according to an example of a logic diagram for activating the different operating modes of the UPS device 10.
[0170] When starting up the UPS 10 device, the user can choose to enter the nominal operating mode MN, the improved nominal operating mode MNA or the operating mode for degraded network MD.
[0171] When the amplitude variation rate of the electrical voltage signal delivered by the power supply network exceeds the first amplitude variation rate threshold If:
[0172] - if the UPS device 10 was in the nominal mode MN, the electronic control unit 20 activates the operating mode for degraded network MD;
[0173] - if the UPS device 10 was in the operating mode for improved nominal MNA, the electronic control unit 20 activates the improved operating mode for degraded network MDA.
[0174] When the UPS device is in the operating mode for degraded network MD or in the improved operating mode for degraded network MDA, and the amplitude variation rate of the electrical voltage signal delivered by the power supply network exceeds the second amplitude variation rate threshold S2, the electronic control unit 20 activates one of the operating modes among the autonomy operating mode MA, the extended autonomy operating mode MAD, or the operating mode for very degraded network MDD, depending on the user's choice or a configuration entered by the user.
[0175] Subsequently, when the amplitude variation rate of the electrical voltage signal delivered by the power supply network exceeds the third amplitude variation rate threshold S3, the electronic control unit 20 activates one of the two autonomous operating modes MA or MAD.
[0176] Having thus described several aspects of at least one embodiment of the present invention, it should be understood that various modifications, alterations, and improvements will readily occur to those skilled in the art. Such alternatives, alterations, and improvements are intended to be part of this description and are intended to be within the spirit and scope of the invention. Accordingly, the above description and the drawings are given by way of example only.
[0177] The invention thus offers a solution making it possible to provide a secure electrical supply of a good level of quality to several loads whose total power is greater than the nominal power of the power supply device which is capable of supplying them.
Claims
Claims
1. Uninterruptible power supply (UPS) device (10) configured to simultaneously supply power to a critical load (31) and a non-critical load (32), the UPS device (10) comprising: - a first converter (14), of the AC / DC type, and a second converter (15), of the DC / AC type, each comprising a first terminal (141, 151) and a second terminal (142, 152), the second terminal (142) of the first converter (14) being connected to the first terminal (151) of the second converter (15), - a continuous energy storage source (14) connected to the second terminal (142) of the first converter (14) and to the first terminal (151) of the second converter (15), - a bypass switch (16) connected between the first terminal (141) of the first converter (14) and the second terminal (152) of the second converter (15), - a main input (11) intended to be connected to an electrical supply network (30), a first output (12) coupled to the second terminal (152) of the second converter (14) and intended to be connected to a critical load (31), and a second output (13) coupled to the first terminal (141) of the first converter (14) and intended to be connected to a non-critical load (32), characterized in that it comprises an electromechanical switch (18) connected between the main input (11) and the first terminal (141) of the first AC / DC converter (14), and an electronic control unit (20) configured to monitor the variation in the amplitude of an electrical voltage signal delivered by the electrical supply network (30) on the main input (11) and to control the electromechanical switch (18), the first converter (14), the second converter (15), the DC energy storage source (17) and the switch of derivation (16) according to operating modes depending on a rate of variation of amplitude of said electrical voltage signal of the electrical supply network (30).
2. UPS device (10) according to claim 1, wherein the electronic control unit (20) comprises means (210) for measuring the electrical voltage intended to be delivered to the main input (11) of the UPS device (10) and comparison means (220), the measuring means (210) comprising at least one module (214) for determining the rate of variation of amplitude of the electrical voltage signal, and the comparison means (220) comprising a module (224) for comparing the rate of variation of amplitude of the electrical voltage signal with a first threshold of rate of variation of amplitude corresponding to the minimum quality required for the supply of a critical load (31), with a second threshold of rate of variation of amplitude corresponding to the minimum quality required for the supply of a non-critical load (32),and a third amplitude variation rate threshold corresponding to the minimum quality required for the supply of the first converter (14), the second variation rate threshold being greater than the first variation rate threshold and the third variation rate threshold being greater than the second variation rate threshold.,
3. A UPS device (10) according to claim 2, further comprising a nominal operating mode (MN) in which the electromechanical switch (18) is closed, the bypass switch (16) is closed, and the first converter (14) and the second converter (15) are in standby.
4. A UPS device (10) according to one of claims 2 or 3, further comprising an enhanced nominal operating mode (ENOM) in which the electromechanical switch (18) is closed, the bypass switch (16) is closed, and the second converter (15) operates in a power factor improvement mode.
5. A UPS device (10) according to claim 4, wherein the first converter (14) also operates in a power factor improvement mode.
6. A UPS device (10) according to one of claims 2 to 5, further comprising a degraded network operating mode (MD) in which the electromechanical switch (18) is closed, the bypass switch (16) is open, and the first converter (14) and the second converter (15) operate together in a double conversion mode.
7. A UPS device (10) according to claim 6, wherein, in the degraded grid operating mode (MD), the first converter (14) further operates in a power factor improvement mode.
8. A UPS device (10) according to claim 2 to 7 further comprising a charging mode of the DC energy storage source (17) in which the first AC / DC converter (14) and / or the second AC / DC converter (15) supplies the DC energy storage source (17) with DC current when the charge level of the DC energy storage source (17) is below a charge threshold.
9. UPS device (10) according to one of claims 2 to 8, further comprising an autonomous operating mode (MA) in which the electromechanical switch (18) is open, and the continuous energy storage source (17) delivers a direct current to the first converter (14) and to the second converter (15).
10. UPS device (10) according to one of claims 1 to 9, further comprising a controlled electromechanical load shedding switch (19), the second output (13) of the UPS device (10) being connected to the first terminal of the first converter (14) via the electromechanical load shedding switch (19).
11. A UPS device (10) according to one of claims 1 to 10, further comprising a short-circuit protection device (21), the second output (13) of the UPS device (10) being connected to the first terminal of the first converter (14) via the short-circuit protection device (21).
12. Method for controlling the uninterruptible power supply device (10), UPS, according to one of claims 1 to 11 to ensure the simultaneous power supply of a critical load (31) connected to the first output (12) of the UPS device (10) and a non-critical load (32) connected to the second output (12) of the UPS device (10) even when the electrical supply network (30) is faulty, the method comprising a monitoring step (900) for monitoring the variation in the amplitude of the electrical voltage signal delivered by the electrical supply network (30) on the main input (11) and a control step (920) for controlling the electromechanical switch (18), the first converter (14), the second converter (15),the continuous energy storage source (17) and the bypass switch (16) according to operating modes of the UPS device (10) depending on a rate of variation of amplitude of said electrical voltage signal of the electrical supply network (30).,
13. A method for controlling the UPS device (10) according to claim 12, wherein the monitoring step (900) comprises measuring (902) the electrical voltage signal on the main input (11) of the UPS device (10), determining (904) the amplitude variation rate of the electrical voltage signal to determine the quality level of the voltage signal, and comparing (908) the amplitude variation rate of the electrical voltage signal to a first amplitude variation rate threshold (Si) corresponding to the minimum quality required for powering a critical load (31), to a second amplitude variation rate threshold (S2) corresponding to the minimum quality required for powering a non-critical load (32), and to a third amplitude variation rate threshold (S3) corresponding to the minimum quality required for powering the first converter (14),the second amplitude variation rate threshold (S2) being greater than the first amplitude variation rate threshold (Si) and the third amplitude variation rate threshold (S3) being greater than the second amplitude variation rate threshold (S2).,
14. A method of controlling the UPS device (10) according to claim 13, wherein the controlling step (920) comprises, depending on the comparison results, activating (930) a nominal operating mode (MN) in which the electromechanical switch (18) is closed to connect the UPS device (10) to the power supply network (30) intended to be coupled to the main input (11), the bypass switch (16) is closed, and the first converter (14) and the second converter (15) are in standby, the nominal operating mode being activated by the electronic control unit (20) when the electrical voltage signal measured by the electronic control unit (20) on the main input (11) has a rate of change of amplitude of the electrical voltage signal lower than the first rate of change threshold.
15. A method of controlling the UPS device (10) according to one of claims 12 to 14, wherein the controlling step (920) comprises, depending on the comparison results, activating an enhanced nominal operating mode (ENOM) in which the electromechanical switch (18) is closed to connect the UPS device (10) to the power supply network (30) intended to be coupled to the main input (11), the bypass switch (16) is closed, and the second converter (15) operates in a power factor improvement mode, the enhanced nominal operation being activated when the critical load (31) on the main input (11) coupled to the first output (12) degrades the current waveform beyond a first current waveform quality level.
16. A method of controlling the UPS device (10) according to claim 15, wherein the first converter (14) also operates in a power factor improvement mode when the critical load (31) to be coupled to the first output (12) and the non-critical load (30) to be coupled to the second output (13) degrade the current waveform beyond a second current waveform quality level.
17. A method of controlling the UPS device (10) according to one of claims 13 to 16, wherein the controlling step comprises, depending on the comparison results, activating a degraded network operating mode (MD) in which the electromechanical switch (18) is closed to connect the UPS device (10) to the electrical supply network (30) intended to be coupled to the main input (11), the bypass switch (16) is open, and the first converter (14) and the second converter (15) operate together in a double conversion mode,the operating mode for degraded network being selected by the electronic control unit (20) when the electrical voltage signal measured by the electronic control unit (20) on the main input (11) has an amplitude variation rate greater than the first amplitude variation rate threshold but less than the second amplitude variation rate threshold.,
18. A method of controlling the UPS device (10) according to claim 17, wherein the first converter (14) further operates in a power factor improvement mode, the power factor improvement mode for the first converter being selected by the electronic control unit (20) when the critical load (31) to be coupled to the first output (12) and / or the non-critical load (32) to be coupled to the second output (13) degrade(s) the current waveform beyond a second current waveform quality level.
19. A method for controlling the UPS device (10) according to one of claims 13 to 18, wherein the control step comprises, depending on the comparison results, an activation of a very degraded network operating mode (MDD) in which a controlled electromechanical load shedding switch (19) connected to the second output (13) is opened to disconnect the non-critical load (32) from the UPS device (10), the very degraded network operating mode being selected by the electronic control unit when the electrical voltage signal measured by the electronic control unit on the input main has an amplitude change rate greater than the second amplitude change rate threshold but less than the third amplitude change rate threshold.
20. A method of controlling the UPS device (10) according to one of claims 12 to 19, wherein the controlling step (920) further comprises activating a charge of the continuous energy storage source (17) via the first converter (14) and / or the second converter (15) when the charge level of the continuous energy storage source (17) is below a charge threshold.
21. A method for controlling the UPS device (10) according to one of claims 12 to 19, wherein the control step comprises, depending on the comparison results, activating an autonomous operating mode (MA) in which the electromechanical switch (18) is open to disconnect the UPS device (10) from the electrical supply network (30) intended to be coupled to the main input (11), and the DC energy storage source (17) is controlled to deliver a DC current to the first converter (14) and to the second converter (15), the autonomous operating mode being selected by the electronic control unit when the electrical voltage signal measured by the electronic control unit (20) on the main input (11) has an amplitude variation rate greater than the third amplitude variation rate threshold.
22. A method of controlling the UPS device (10) according to claim 21, wherein the controlling step comprises activating an extended autonomy operating mode (MAD) in which a controlled electromechanical load shedding switch (19) connected to the second output (13) is opened to disconnect the non-critical load (32) from the UPS device (10), the extended autonomy operating mode being selected by the electronic control unit when it is desired to extend the duration of autonomous supply of the critical load.