CN110268621B - Circuit for regulating DC component of output voltage of uninterruptible power supply - Google Patents
Circuit for regulating DC component of output voltage of uninterruptible power supply Download PDFInfo
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- CN110268621B CN110268621B CN201780085965.7A CN201780085965A CN110268621B CN 110268621 B CN110268621 B CN 110268621B CN 201780085965 A CN201780085965 A CN 201780085965A CN 110268621 B CN110268621 B CN 110268621B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/40—Means for preventing magnetic saturation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4803—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode with means for reducing DC component from AC output voltage
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- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Inverter Devices (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
A control circuit (6) for controlling an output voltage (V) of an uninterruptible power supply unit (1), comprising: -for transmitting a voltage set value (V)ref) A module (7); -a measurement module (8); -a module (9) for regulating said voltage (V), said module being configured to determine a set value (Co) for driving a power supply unit (1), said measurement module (8) comprising: -a first circuit block (81) configured to measure a current at an output of the power supply unit (1); -a second circuit block (82) configured to measure an AC component (V) of the voltage (V)AC) (ii) a -a third circuit block (83) configured to measure a DC component (V) of the voltage (V)DC). The third measurement circuit block (83) includes: a low pass filter (84) configured to not change a DC component (V) of the voltage (V)DC) In the case of (a) an AC component (V) of the voltage (V)AC) Attenuation; and for measuring the DC component (V)DC) Comprises an amplifier circuit block configured to measure a DC component (V)DC) The filtered signal transmitted by the filter (84) is previously amplified.
Description
Technical Field
The present invention relates to an uninterruptible power supply, and more particularly, to a circuit for regulating a Direct Current (DC) component of a voltage of an uninterruptible power supply.
Background
An Uninterruptible Power Supply (UPS) is an electronic power device: it is capable of providing a stable Alternating Current (AC) voltage to a load without any interruption or micro-interruption, whatever may happen on the power network.
UPSs are commonly used to provide power to buildings such as data centers (e.g., data hosting centers or industrial web sites).
The term "inverter" is often misused to mean the entire device. This applies, for example, to "inverters" which are arranged between the supply network and the servers of the computer center.
The UPS is composed of a converter (referred to as a "rectifier") that converts an AC voltage into a DC voltage, an energy storage device (such as a battery or a supercapacitor), and a converter (also referred to as an "inverter") that generates an AC voltage from the DC voltage and operates at a constant frequency. In some cases, the energy storage device may be replaced by a device for generating and storing energy, such as a photovoltaic generation system or an inertial storage system of the "flywheel" type.
In some cases, the AC voltage output by the UPS needs to be regulated to obtain a higher voltage, and sometimes electrical isolation measures need to be taken. To achieve electrical isolation and/or boost the AC voltage, a transformer or autotransformer is electrically coupled between the UPS and a load powered by the UPS. Depending on the configuration, the transformer may form part of the UPS, a load powered by the UPS, or a supply network powered by the UPS.
When a DC component is present in the AC voltage delivered by the output of the inverter of the UPS, the DC voltage component generates a DC current component in the primary winding of the transformer associated with the UPS, thereby saturating the core of the transformer.
Saturation of the transformer core may cause the transformer and/or UPS to fail.
A standard isolation transformer of acceptable quality can accommodate a DC component of several tens of millivolts (mV) before the core saturates. However, such DC components may generate additional thermal and acoustic noise that is not negligible compared to nominal operation, and may cause the voltage at the transformer output to transform due to saturation.
Such a DC voltage component of several tens of millivolts (e.g., about 40mV) can generate a large DC current component in the primary winding of the transformer because the current component can reach a value of several tens of amperes (a).
In the equivalent circuit of the transformer shown in fig. 1, this saturation is represented by a magnetizing inductance (also called magnetic inductance) Lm. Reference character LCCIndicating a leakage inductance that cannot be saturated, reference symbol R1 denotes the resistance of the winding, reference symbol Rf denotes the equivalent resistance of the core loss of the transformer core, and m denotes the transformation ratio of an ideal transformer.
The situation is worse for a sawtooth autotransformer that exhibits very low magnetic currents, and can only accommodate DC voltage components of about 10mV or less if not dependent on increased size.
A document written by Merlin Gerin entitled "Direct Current (DC) effect on transformers" explains that a DC current component of greater than 5A in a distribution transformer will necessitate the use of a special transformer of increased size to accommodate the current. Above 30A, the core needs to be modified in a very significant way, in particular by including an air gap. In the above example, a 240mV DC component output by the UPS (i.e., one thousandth of the AC component of the voltage output by the UPS) can produce a DC current of 30A.
To overcome this problem, it is known to make the transformer larger in size. However, when the UPS includes a transformer, increasing the size of the transformer may result in an increase in the financial cost of producing the transformer, thereby resulting in an increase in the financial cost of the UPS, and may also result in an increase in the size of the UPS. If the transformer is located outdoors, the electrical installation becomes more expensive.
Another known solution to overcome this problem is to control the output current of the UPS using feedback in a control loop to eliminate the DC component of the current.
However, this solution cannot be applied as such for powering a load (e.g. a single-wave rectifier) consuming a current with a DC component.
Another solution suitable for loads consuming current having a DC component is to use the voltage measurement circuit of the UPS to monitor both the AC and DC components of the AC output voltage.
However, the accuracy and dynamic range of the voltage measurement circuit is not sufficient to control the DC component accurately enough. This problem comes from the fact that: it is necessary to measure a DC component ten thousand times smaller than the fundamental component.
Document JP2006/136107 discloses a control circuit for the output voltage of an uninterruptible power supply unit, the output of which is connected to a transformer. The control circuit has a module for transmitting a voltage set point, a first current sensor coupled to an output of the UPS and configured to measure an output current from an inverter of the UPS, and a module for regulating the voltage output by the UPS and configured to determine a control set point for a control switch of the inverter of the UPS based on a measurement of the measurement module. The control circuit further has a second current sensor and a measuring transformer for measuring a secondary voltage of the transformer, the second current sensor and the measuring transformer being connected at the output of the inverter to the output of the transformer. The control circuit also has a circuit block configured to determine a DC component of a voltage output by an inverter of the UPS from the current measurement, the circuit block including a low pass filter and an amplifier circuit block configured to amplify the filtered signal transmitted by the filter prior to measuring the DC component.
However, the transformer passes only the AC component of the signal, and does not pass the DC component of the signal.
From document JP H07231676 is also known a control circuit for controlling the voltage of an inverter, said control circuit comprising a module for measuring the current at the output of the inverter and a module for regulating the voltage output by the inverter and configured to determine the control settings of the controlled switches of the inverter.
Disclosure of Invention
The present invention is directed to providing a voltage controlled uninterruptible power supply for outputting an AC voltage without any DC component or with a negligible DC component, and more particularly, to providing a dedicated circuit for accurately measuring and controlling the DC component and the AC component of the voltage output by an uninterruptible power supply unit, thereby enabling to supply power to a transformer or an autotransformer coupled to an output of the uninterruptible power supply unit, in particular.
The present invention first proposes a control circuit for controlling an output voltage of an uninterruptible power supply unit comprising a DC voltage source (for example a battery) coupled between a rectifier and an inverter, the control circuit being intended to be coupled between an output terminal of the uninterruptible power supply unit and a transformer or autotransformer, the control circuit comprising:
-a set-point module for sending a voltage set-point;
-a measuring module for measuring an output characteristic of the cell; and
-a regulator module for regulating the output voltage of the unit and configured to determine a control set point of a controlled switch of the unit from the measurement value of the measurement module;
the measurement module includes:
-a first measurement circuit block configured to measure an output current of the cell;
-a second measurement circuit block configured to measure an AC component of the output voltage of the cell; and
-a third measurement circuit block configured to measure a DC component of the output voltage of the cell.
According to a general characteristic of the invention, the third measurement circuit block comprises: a low pass filter configured to attenuate an AC component of the measured voltage without changing the DC component of the measured voltage; and a measurement device for measuring a DC component of an output voltage of the uninterruptible power supply unit, the measurement device including an amplifier circuit block configured to amplify the filtered signal delivered by the filter prior to measuring the DC component.
The control circuit of the present invention is thus able to control the ups unit so that it can output an AC voltage without any or negligible DC component, and also to power the transformer or autotransformer with a suitable signal.
In addition, the uninterruptible power supply unit whose output voltage is controlled by the control circuit of the present invention does not include a transformer or an autotransformer. Such an uninterruptible power supply unit is called a "transformerless uninterruptible power supply unit". Since the ups unit does not include a transformer or autotransformer, it can be used to simultaneously power a motor, a transformer or autotransformer, and a more conventional load.
It sometimes happens that these loads naturally sink DC current to work. This makes it impossible to rely on current information to avoid saturation of the "remote" transformer to which the unit is connected. The control circuit according to the invention can also regulate the DC output voltage of the ups unit accurately, in addition to the AC voltage, by measuring the DC component of this voltage (which is the only relevant information available) with extreme accuracy, which results from the fact that the measurements are made at the output of the ups unit and upstream of the transformer or autotransformer.
Conventionally known electronic circuits for regulating voltage cannot directly control the regulation of high voltage. Therefore, the signal needs to be attenuated in order to be compatible with conventionally known integrated circuits for conditioning. The term "high voltage" is used to denote a voltage higher than can be directly handled by low level electronic circuitry.
By attenuating the signal in a conventional manner, the DC component of the AC voltage output by the power supply device is also attenuated, which means that defects in the electronic circuit (offset, input current, noise) can lead to large errors in the measured values.
The third measuring circuit block of the measuring module of the control circuit of the invention uses a low-pass filter in order to attenuate the AC component of the voltage measured on the first connection terminal, i.e. at the output of the power supply unit. The low pass filter is used to attenuate the AC component while keeping the DC component constant. Thus, the attenuation performed by the filter enables the amplification performed by the amplifier circuit block of the measurement device to amplify only the signal related to the DC component. The gain applied to the DC component is calibrated so that the signal associated with the DC component is as large as possible while remaining compatible with the electronic circuitry. This gain can help measure the DC component and improve the measurement accuracy.
After attenuation by the low pass filter, the peak-to-peak amplitude of the voltage matches the characteristics of the standard amplifier circuit.
Thus, the third and second measurement circuit blocks enable the regulator module to generate a control setting for the power supply unit suitable for regulating the output voltage of the power supply device, thereby minimizing or even eliminating the DC component in the output voltage while controlling the AC component.
For example, for 231VrmsAnd the same frequency as that of the supply network (more specifically, 50 hertz (Hz) to 60Hz), the control circuit of the invention makes it possible to reduce the DC component in the voltage signal output by the uninterruptible power supply unit to below 20 mV. This reduction of the DC component is sufficient to avoid any saturation of the magnetic core of a standard transformer or autotransformer coupled to the output of such a power supply unit.
Therefore, the control circuit can be applied to a single-phase power supply device or a multi-phase power supply device as well.
The control circuit of the present invention allows the DC component to be extracted from a signal of 100mV, thereby allowing great accuracy to be obtained in this measurement, with a quantization interval of about 500 microvolts (μ V).
According to a first aspect of the control circuit, the regulator module may comprise:
-a first comparator configured to determine a first signal from a difference between a voltage set point and an AC component measured by the second measurement circuit block;
-a second comparator configured to determine a second signal corresponding to a voltage error between a voltage set-point and the AC and DC components measured at the output of the power supply unit, from a difference between the first signal and a signal related to the DC component determined by the measurement performed by the third measurement circuit block; and
-corrector means configured to determine said control set-point as a function of a second signal.
The first comparator is used to determine an error between the voltage set-point and the voltage output by the power supply unit. The second comparator is then used to process the first signal so that the subsequently determined control setting is used to remove the DC component from the voltage signal output by the cell.
According to a second aspect of the control circuit, the corrector arrangement may comprise:
-a first corrector circuit block configured to determine a current set point for cancelling voltage errors from the second signal;
-a third comparator configured to determine a third signal from a difference between the current set-point delivered by the first corrector circuit block and the current measured by the first measurement circuit block, the third signal corresponding to a current error between the current set-point and the measured current; and
-a second corrector circuit block configured to determine the control set point from a third signal.
Thus, the control set value is determined in three stages, first from the voltage error, the current set value, then the current error, and then the set value. The correctors used may be of different types depending on the requirements and constraints of the dynamic range expected for the output voltage when the current consumed by the load is disturbed.
For example, the corrector may typically be of the proportional-integral-derivative type, or may be a state feedback corrector, a sliding mode based corrector, or even a predictive corrector.
According to a third aspect of the control circuit, the regulator module further comprises a corrector circuit block configured to apply a proportional integral type correction to the DC component measured by the third measurement circuit block before the measured DC component is applied by the second comparator.
The proportional integral type correction is for eliminating a static error from the signal, thus making it possible to generate a control setting value, thereby making it possible to well eliminate a DC component from the voltage signal output from the power supply unit.
Secondly, the present invention provides an uninterruptible power supply device, comprising: at least one first connection terminal for connection to a power supply network; at least one second connection terminal connected to a load via a transformer or autotransformer; and at least one uninterruptible power supply unit including a rectifier coupled to the at least one first connection terminal, an inverter coupled to the at least one second connection terminal, and a DC voltage source (e.g., a battery) coupled between the rectifier and the inverter.
According to a general characteristic of the device, for each uninterruptible power supply unit, the device further comprises a control circuit for controlling the voltage output by the uninterruptible power supply unit as defined above, each control circuit being coupled between the uninterruptible power supply unit and the at least one second connection terminal.
According to an aspect of the power supply apparatus, for each uninterruptible power supply unit, the apparatus may further include a transformer or an autotransformer coupled to an output of the power supply unit, the transformer or the autotransformer being associated with the power supply unit between the measurement module and the at least one second connection terminal.
Third, the present invention provides a control method for controlling a voltage output by an uninterruptible power supply unit including a DC voltage source (e.g., a battery) coupled between a rectifier and an inverter, the method being performed by a control circuit for coupling between output terminals of the uninterruptible power supply unit and a transformer or autotransformer, the method including:
-sending a voltage set value;
-measuring an output characteristic of the power supply unit; and
-adjusting the output voltage of the power supply unit, the adjuster being configured to determine a control setting of a controlled switch of the power supply unit from the performed measurement;
measuring the output characteristic includes: measuring an output current of the power supply unit, measuring an AC component of an output voltage of the power supply unit, and measuring a DC component of the output voltage of the power supply unit.
According to a general characteristic of the method, measuring the DC component comprises low-pass filtering a signal of the output voltage of said power supply and amplifying the filtered power supply signal before measuring said DC component of the output voltage.
According to the first aspect of the control method, the adjusting may include:
-making a first comparison based on a difference between the voltage set point and the measured AC component to deliver a first signal;
-making a second comparison according to the difference between said first signal and a signal related to the measured DC component, to deliver a second signal corresponding to the voltage error between the voltage set-point and the AC and DC components measured at the output of the power supply unit; and
-a correction step, in which the control set-point is determined as a function of the second signal.
According to the second aspect of the control method, the correcting step may include:
-determining a current set-point for eliminating an error of the output voltage from the second signal;
-determining a third signal from a difference between the current set point and the measured current, the third signal corresponding to a current error between the current set point and the measured current; and
-determining the control set point from a third signal.
According to a third aspect of the control method, the adjusting may include applying a proportional integral type correction to the measured DC component before the second comparison is made.
Drawings
The invention will be better understood from reading the following description, given by way of non-limiting representation, and with reference to the accompanying drawings, in which:
fig. 1 (described above) is an equivalent circuit diagram of a transformer with its input coupled to a prior art uninterruptible power supply unit;
fig. 2 is a schematic diagram showing an uninterruptible power supply apparatus in an embodiment of the invention; and
fig. 3 is a flow chart of a method of controlling an output voltage of an uninterruptible power supply device in an embodiment of the invention.
Detailed Description
Fig. 2 is a schematic diagram of an uninterruptible power supply apparatus 100 according to an embodiment of the invention.
The power supply device 100 comprises three first connection terminals 2 for connecting a three-phase supply network and three second connection terminals 3 for connecting a load. In this example, the three terminals are three phases of a three-phase circuit, and the neutral point is not shown in the figure in view of clarity of the drawing.
The power supply apparatus 100 further includes a plurality of uninterruptible power supply units 1, each uninterruptible power supply unit 1 including a rectifier coupled to the first connection terminal 2, an inverter coupled to the second connection terminal 3, and a DC voltage source (e.g., a battery) coupled between the rectifier and the inverter. In view of the clarity of fig. 2, only one ups unit 1 is shown.
The power supply device 100 includes, for each power supply unit 1, a filter 4, a transformer or autotransformer 5, and a control circuit 6 for controlling the output voltage of the power supply unit 1.
The filter 4 is a passive LC type filter having an inductance L and a capacitance C for each output phase of the power supply unit 1, and more specifically, an inductance L and a capacitance C at the output terminal of the inverter of the power supply unit 1. The filter 4 is used to filter the output signal so that a voltage without any switching harmonics is obtained.
In the embodiment shown in fig. 2, the transformer 5 forms part of the power supply apparatus 100. In a variant, for each line of the device 100 comprising the power supply unit 1, a transformer may be coupled between the device 100 and the load.
The filter 4 is electrically coupled between the three output terminals 20 of the power supply unit 1 and the transformer 5, and the control circuit 6 is also electrically coupled between the three output terminals 20 of the power supply unit 1 and the transformer 5.
The control circuit 6 comprises means for sending a voltage set value VrefA setting value module 7, a measuring module 8 for measuring the output characteristics of the power supply unit 1, and a power supply system using the sameA regulator module 9 for regulating the output voltage of the power supply unit 1 and configured to determine a control set value Co for the controlled switches of the inverter of the power supply unit 1 from the measurements performed by the measurement module 8.
The measurement module 8 includes: a first measurement circuit block 81 configured to measure a current I at each output terminal 20 of the power supply unit 1; a second measurement circuit block 82 configured to measure an AC component V of the output voltage of the power supply unit 1AC(ii) a And a third measurement circuit block 83 configured to measure a DC component V of the voltage output from the power supply unit 1DC。
In the embodiment shown in fig. 2, the first measurement circuit block 81 is coupled between the three output terminals 20 of the power supply unit 1 and the inductance L of the filter 4. In a variant, the first measurement circuit block 81 may be coupled downstream of the inductance L of the filter 4 in the direction of the flow of the power, i.e. between the inductance L and a node for connecting the capacitance C of the filter 4. This configuration with the first measurement circuit block 81 between the connection node of the inductance L and the capacitance C of the filter is more robust in terms of electromagnetic compatibility.
The third measurement circuit block 83 further comprises a low-pass filter 84 and a measurement device 85 for measuring the DC component V of the output voltage of the power supply unit 1DC. The low pass filter 84 is configured to not change the DC component V of the measured voltage VDCOf the measured voltage V is caused to have an AC component V of the measured voltage VACAnd (4) attenuation.
The measuring means 85 comprise means for measuring the DC component VDCAn amplifier circuit block which previously amplifies the filtered signal delivered by the low pass filter 84 of the third measurement circuit block 83. The signal delivered by the low-pass filter 84 (which signal mainly comprises only the DC component V of the output voltage V of the power supply unit 1) is amplified using the amplifier circuit block of the measuring device 85DC) Previously, a low pass filter 84 was used to maintain the DC component VDCMaking the AC component V constant whileACAnd (4) attenuation. The gain applied to the DC component is calibrated to the DC component VDCThe relevant signal is as large as possible while remaining compatible with the electronic circuitry. This gain can help to measure the DC component VDCAnd the measurement accuracy can be improved.
The regulator module 9 comprises a first comparator 91, the first comparator 91 receiving the voltage set-point V delivered by the set-point module 7refAnd an AC component V of the output voltage V of the power supply unit 1 delivered by the second measurement circuit block 82ACTo be used as input. The first comparator 91 is configured to set the voltage according to the voltage set value VrefWith the AC component V measured by the second measurement circuit block 82ACThe difference between them to output a first signal.
The regulator module 9 further comprises a second comparator 92, the second comparator 92 receiving the first signal from the first comparator 91 and the DC component V delivered by the third measurement circuit block 83DCAs an input. DC component VDCCorresponds to the signal delivered by the proportional-integral corrector 93, the proportional-integral corrector 93 receiving the DC component V delivered by the third measurement circuit block 83DCAs an input. The second comparator 92 is configured to output a second signal epsilon depending on the difference between the first signal and the corrected DC component delivered by the proportional-integral corrector 93V. Second signal epsilonVCorresponding to the voltage set value VrefWith the AC component V measured at the output of the power supply unit 1ACAnd a DC component VDCThe error of the voltage V in between.
Finally, the regulator module 9 comprises a corrector means 94, the corrector means 94 being configured to depend on the second signal εVTo determine the control set point Co.
The corrector device 94 comprises a first corrector circuit block 95, the first corrector circuit block 95 being configured to respond to the second signal epsilonVTo determine a voltage error epsilon for cancellationVCurrent set value ofC. Thus, the first corrector circuit block 75 is used to combat harmonic interference generated by the load current and imperfections of the inverter converter (dead time, minimum pulse or pulse minimum). The corrector device 94 further comprises: a third comparator 96 configured to output a current set value I delivered by the first corrector circuit block 95CWith the current signal delivered by the first measurement circuit block 81 of the measurement module 8The difference between the signals I to determine the third signal epsilonI(ii) a And a second corrector circuit block 97 configured to correct the third signal ε delivered by the third comparator 96ITo determine the control set value Co of the inverter of the power supply unit 1. Third signal epsilonICorresponding to the current set value ICCurrent error from the measured current I. The second corrector circuit block 97 is configured to increase the harmonic content of the voltage.
Then, the control setting value Co is transmitted to the uninterruptible power supply unit 1 to control the Insulated Gate Bipolar Transistors (IGBT) of the inverter of the uninterruptible power supply unit 1 so as to transmit the control setting value Co at the output terminal of the power supply unit 1 without including any DC component VDCOr a voltage with a negligible DC component, i.e. a voltage suitable for being supplied to a conventional transformer or autotransformer 5 without any risk of saturating the magnetic core of the transformer 5.
Fig. 3 is a flowchart of a method of controlling an output voltage of the uninterruptible power supply unit 1 in an embodiment of the invention.
In a first step 300, the set-point module 7 sends a set-point V of the voltage for the output of the power supply unit 1ref。
In a second step 310, the measurement module 8 measures the output characteristics of the power supply unit 1. This step 310 of measuring the characteristic comprises: a measurement step 312 of measuring the output current I by the first measurement circuit block 81 monitoring the waveform and amplitude of the signal; a measurement step 314 of measuring the AC component V of the output voltage V of the power supply unit 1 by means of the second measurement circuit block 82AC(ii) a A filtering step 316 of filtering the voltage signal V by means of the low-pass filter 84 of the third measurement circuit block 83; then follows a measurement step 318 of measuring the DC component V of the output voltage V of the power supply unit 1 by using the measurement means 85 of the third measurement circuit block 83DCIs measured.
In a next step 320, the regulator module 9 determines a control setting Co for the inverter of the power supply unit 1 to generate the DC component VDCThe output voltage V of the power supply unit 1 has been reduced or even eliminated. In step 320, the first comparator 91 in step 322 generates the voltage set point signal VrefTo the power supply unit 1AC component V of the output voltageACPerforms a first subtraction between the signals of (a) and then, in a following step 324, the second comparator 92 of the regulator module 9 compares the signal delivered by the first comparator 91 with the DC component V delivered by the proportional-integral corrector 93DCPerforms a second subtraction between the corrected signals, the proportional-integral corrector 93 receiving the DC component V delivered by the third measurement circuit block 83DCAs an input.
In a next step 330, the corrector device 94 of the regulator module 9 depends on the voltage error ε in a first step 332VTo determine the current set point ICThen in a second step 334 by setting the value of I at the currentCPerforms a subtraction with the current I measured by the first measurement circuit block 81 to determine the current error εIThen in a final step 140, based on the current error eITo determine a control set-point Co for the controlled switching of the inverter of the uninterruptible power supply unit 1 of the control device, which is sent to the uninterruptible power supply unit 1 by the regulator module 9 of the control circuit 6.
The control circuit and the method performed by the control circuit aim to provide a voltage controlled uninterruptible power supply for generating an output AC voltage containing no or negligible DC component. More specifically, the control circuit of the present invention enables accurate measurement of the DC and AC components of the voltage output by an uninterruptible power supply, and in particular control of the DC and AC components, thereby powering a transformer or autotransformer at the output of the uninterruptible power supply.
Claims (6)
1. A control circuit (6) for controlling an output voltage of an uninterruptible power supply unit (1), the uninterruptible power supply unit (1) comprising a DC voltage source coupled between a rectifier and an inverter, the control circuit (6) for coupling between an output terminal (20) of the uninterruptible power supply unit (1) and a transformer or autotransformer (5), the control circuit (6) comprising:
-a set-point module (7) for sending a voltage set-point (V)ref)；
-a measuring module (8) for measuring an output characteristic of the power supply unit (1); and
-a regulator module (9) for regulating the output voltage of the power supply unit (1) and configured to determine a control set value (Co) of the controlled switching of the inverter of the power supply unit (1) from the measurement value of the measurement module (8);
the measurement module (8) comprises:
-a first measurement circuit block (81) configured to measure an output current of the power supply unit (1);
-a second measurement circuit block (82) configured to measure an AC component (V) of the output voltage of the power supply unit (1)AC) (ii) a And
-a third measurement circuit block (83) configured to measure a DC component of an output voltage (V) of the power supply unit (1);
characterized in that the third measurement circuit block (83) comprises: a low pass filter (84), the low pass filter (84) being configured to not change a DC component (V) of the measured voltage (V)DC) In the case of (2) causing the AC component (V) of the measured voltage to beAC) Attenuation; and a measuring device (85), the measuring device (85) being configured to measure a DC component (V) of an output voltage of the uninterruptible power supply unit (1)DC) The measuring device (85) comprises an amplifier circuit block configured to measure a DC component (V)DC) Previously amplifying the filtered signal transmitted by the filter (84),
wherein the regulator module (9) comprises:
-a first comparator (91) configured to determine a voltage set-point (V)ref) With the AC component (V) measured by the second measurement circuit block (82)AC) The difference between them to determine a first signal;
-a corrector circuit block (93), the corrector circuit block (93) being configured to correct a DC component (V) measured by the third measurement circuit block (83) of a measurement module (8)DC) Applying a proportional integral type correction;
-a second comparator (92) configured to determine a DC component (V) from the first signal and a measurement performed by the third measurement circuit block (83)DC) Associated messageThe difference between the signs determines the second signal (epsilon)V) Said second signal corresponding to a voltage set value (V)ref) A voltage error (epsilon) between a difference value with an AC component measured at an output terminal of the power supply unit (1) and a DC component corrected by a corrector circuit block (93)V) (ii) a And
-corrector means (94) configured to vary the second signal (epsilon)V) To determine said control set-point (Co).
2. The control circuit (6) according to claim 1, wherein the corrector arrangement (94) comprises:
-a first corrector circuit block (95) configured to depend on the second signal (ε)V) To determine a voltage error (epsilon) for cancellationV) Current set point (I) ofC)；
-a third comparator (96) configured to be dependent on the current set-point (I) delivered by the first corrector circuit block (95)C) And the current (I) measured by the first measurement circuit block (91) to determine a third signal (epsilon)I) The third signal (epsilon)I) Corresponding to the current set value (I)C) A current error with the measured current (I); and
-a second corrector circuit block (97) configured to depend on the third signal (ε)I) To determine said control set-point (Co).
3. An uninterruptible power supply device (100), comprising: at least one first connection terminal (2), the first connection terminal (2) being intended to be connected to a power supply network; at least one second connection terminal (3), said second connection terminal (3) being connected to a load via a transformer or autotransformer (5); and at least one uninterruptible power supply unit (1), the uninterruptible power supply unit (1) comprising a rectifier coupled to the at least one first connection terminal (2), an inverter coupled to the at least one second connection terminal (3), and a storage battery coupled between the rectifier and the inverter;
the uninterruptible power supply arrangement is characterized in that, for each uninterruptible power supply unit (1), the uninterruptible power supply arrangement further comprises a control circuit (6) for controlling the output voltage of the inverter of the uninterruptible power supply unit (1) according to any of claims 1 to 2, each control circuit (6) being coupled between the uninterruptible power supply unit (1) and the at least one second connection terminal (3).
4. Uninterruptible power supply device (100) according to claim 3, the uninterruptible power supply device (100) further comprising, for each uninterruptible power supply unit (1), a transformer or autotransformer (5) coupled to an output of the power supply unit (1), the transformer or autotransformer (5) being associated with the power supply unit (1) between the measurement module (8) and the at least one second connection terminal (3).
5. A control method for controlling an output voltage of an uninterruptible power supply unit (1), the uninterruptible power supply unit (1) comprising a DC voltage source coupled between a rectifier and an inverter, the method being performed by a control circuit (6) for coupling between output terminals of the uninterruptible power supply unit (1) and a transformer or autotransformer (5), the method comprising:
-sending (300) a voltage set-point (V)ref)；
-measuring (310) an output characteristic of the power supply unit (1); and
-regulating (320 and 330) an output voltage (V) of the power supply unit (1), the regulator being configured to determine a control set value (Co) of a controlled switch of an inverter of the power supply unit (1) from the performed measurements;
measuring (310) the output characteristic includes: measuring (312) an output current (I) of the power supply unit (1), measuring (314) an AC component (V) of an output voltage (V) of the power supply unit (1)AC) And measuring a DC component (V) of an output voltage (V) of the power supply unit (1)DC)，
The method is characterized in that the DC component (V) is measuredDC) Comprising low-pass filtering (316) a signal of an output voltage (V) of the power supply unit (1) and measuring (318) the DC component (V) of the output voltage (V)DC) Pre-amplifying a filtered signal，
Wherein the adjusting (320 and 330) step comprises:
-according to the voltage set value (V)ref) With measured AC component (V)AC) The difference between them making a first comparison (322), thereby conveying a first signal;
-for the measured DC component (V)DC) Applying a proportional integral type correction;
-from the first signal and the measured DC component (V)DC) The difference between the correlated signals is subjected to a second comparison (324), thereby delivering a second signal (ε)V) The second signal (epsilon)V) Corresponding to the voltage set value (V)ref) A voltage error between a difference with an AC component measured at an output of the power supply unit (1) and the corrected DC component; and
-a correction step (330) in which, depending on the second signal (epsilon)V) To determine said control set-point (Co).
6. The control method of claim 5, wherein the step of correcting (330) comprises:
-from said second signal (ε)V) Determining (332) a voltage error (epsilon) for cancellationV) Current set point (I) ofC)；
-according to said current set value (I)C) And the measured current (I) to determine a third signal (epsilon)I) The third signal (epsilon)I) Corresponding to the current set value (I)C) A current error with the measured current (I); and
-on the basis of the third signal (epsilon)I) To determine said control set-point (Co).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1663326A FR3061375B1 (en) | 2016-12-23 | 2016-12-23 | CIRCUIT FOR CONTROLLING THE COMPONENT CONTINUES THE OUTPUT VOLTAGE OF A POWER SUPPLY WITHOUT INTERRUPTION |
| FR1663326 | 2016-12-23 | ||
| PCT/FR2017/053567 WO2018115643A1 (en) | 2016-12-23 | 2017-12-14 | Circuit for regulating the dc component of the output voltage of an uninterruptable power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110268621A CN110268621A (en) | 2019-09-20 |
| CN110268621B true CN110268621B (en) | 2021-04-06 |
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ID=58609542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780085965.7A Active CN110268621B (en) | 2016-12-23 | 2017-12-14 | Circuit for regulating DC component of output voltage of uninterruptible power supply |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3560088A1 (en) |
| CN (1) | CN110268621B (en) |
| FR (1) | FR3061375B1 (en) |
| WO (1) | WO2018115643A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1255581B (en) * | 1992-07-22 | 1995-11-09 | Ansaldo Spa | CIRCUIT DEVICE TO AVOID SATURATION OF THE TRANSFORMER IN A DC / AC CONVERTER WITH REGULATOR REVERSE INVERTER |
| JP3228387B2 (en) * | 1994-02-21 | 2001-11-12 | 富士電機株式会社 | Deflection control method |
| JP3237698B2 (en) * | 1997-07-18 | 2001-12-10 | サンケン電気株式会社 | Feedback control device |
| CN1159825C (en) * | 2000-12-22 | 2004-07-28 | 广东志成冠军电子实业有限公司 | High-capacity UPS |
| JP2006136107A (en) * | 2004-11-05 | 2006-05-25 | Fuji Electric Systems Co Ltd | Semiconductor power converter and its magnetic asymmetry control method |
| US7184282B2 (en) * | 2005-03-11 | 2007-02-27 | Origin Electric Company, Limited | Single-phase power conversion device and three-phase power conversion device |
| CN101567638A (en) * | 2009-01-14 | 2009-10-28 | 南京航空航天大学 | Active output direct-current component control inverter and control method thereof |
| CN102412732A (en) * | 2010-04-03 | 2012-04-11 | 联正电子(深圳)有限公司 | Uninterrupted power supply device and control method thereof |
-
2016
- 2016-12-23 FR FR1663326A patent/FR3061375B1/en active Active
-
2017
- 2017-12-14 CN CN201780085965.7A patent/CN110268621B/en active Active
- 2017-12-14 WO PCT/FR2017/053567 patent/WO2018115643A1/en unknown
- 2017-12-14 EP EP17822420.0A patent/EP3560088A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018115643A1 (en) | 2018-06-28 |
| EP3560088A1 (en) | 2019-10-30 |
| FR3061375A1 (en) | 2018-06-29 |
| CN110268621A (en) | 2019-09-20 |
| FR3061375B1 (en) | 2019-05-31 |
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