CH708511B1 - Method for controlling a neutral point voltage of an electronic power converter. - Google Patents
Method for controlling a neutral point voltage of an electronic power converter. Download PDFInfo
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- CH708511B1 CH708511B1 CH01545/13A CH15452013A CH708511B1 CH 708511 B1 CH708511 B1 CH 708511B1 CH 01545/13 A CH01545/13 A CH 01545/13A CH 15452013 A CH15452013 A CH 15452013A CH 708511 B1 CH708511 B1 CH 708511B1
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Classifications
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/25—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in series, e.g. for multiplication of voltage
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/425—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The method according to the invention is used to control a star-point voltage (u N'Y) in an electronic multiphase power converter, the power converter for each phase comprising a phase module with an input side and an output side, the phase modules being connected at their input sides in a star circuit Is connected to the star point of an input filter, and an input current control is provided in phase-wise manner, which regulates the input current to a predetermined input current nominal value. In order to control the star-point voltage (u N'Y), a measured value corresponding to the star-point voltage (u N'Y) is formed, an offset current setpoint is formed from this measured value by means of a controller,
Description
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the field of power electronic circuits and relates to a method for controlling a star-point voltage in an AC / DC converter for power transmission from a multiphase primary side to a secondary side or vice versa.
[0002] Circuits for the equilibrium of a three-phase mains voltage are known. In the following articles phase-phase rectifiers with power factor correction (PFC) are presented in which one phase module is assigned to an alternating voltage phase, with which an alternating voltage is generated via a phase converter and a phase transformer. The alternating voltages of the phase transformers are added by series circuit at output sides of the phase transformers. - MA de Rooij, JA Ferreira, and JD Van Wyk, "A three-phase, soft switching, transformer isolated, unity power factor front end converter," in the 29th Annual IEEE Power Electronics Specialists Conference (PESC98), voi. 1, 1998, pp. 798-804. W. Phipps, R. Duke, and MJ Harrison, "A new generation power converter with pseudo-derivative control," in the 28th Annual International Telecommunications Energy Conference (INTELEC'06), 2006, pp. 1-5.
[0003] On the input side, the phase modules can form a star circuit. This leads to the problem that a star point results on the primary side and, if the star point can not be earthed, the star point voltage can behave uncontrolled if the load is uneven.
[0004] It is an object of the invention to provide a method for controlling a star-point voltage, which is applicable at least for some of the circuits mentioned at the outset.
[0005] The object is achieved by a method for controlling a star-point voltage according to the independent claim 1.
The method is used to control the star-point voltage in an electronic multi-phase power converter, wherein the power converter for each phase has a phase module with an input side and an output side, the phase modules being connected in their star circuits in a star circuit and phase-wise each having an input current regulation Adjusts the input current of the phase module to a predetermined input current set point. In order to control the star-point voltage, a measured value corresponding to the star-point voltage is formed, an offset current setpoint is formed from this measured value by means of a controller, and the offset current setpoint is added to a desired value for the input phase current of this phase for each phase So as to form the input current set point for this phase.
The set value for the input phase current of this phase (to which the offset current setpoint is added) is generated, for example, by a superordinate controller for the power flow through the phase or for the output voltage of the power converter.
In an embodiment, the measured value is formed according to the star-point voltage, in that an artificial star point is formed by means of a symmetrical filter, and the star-point voltage is measured with this artificial star point as a reference and thus forms the measured value.
In one embodiment, the measured value is formed according to the star-point voltage, in that the voltages of the phases are measured and the measured value is computationally determined from these measurements.
The control is particularly suitable in combination with a regulation of an electronic power converter for power transmission from a primary side (or alternating voltage side) with several phases to a secondary side (or DC voltage side) or vice versa, wherein the power converter has a transformer for each of the phases Wherein a primary winding of a partial transformer is connected to an associated switching device, and wherein secondary windings of the partial transformers can be connected in series or in parallel, if necessary with the interposing of one rectifier per phase, as a result of which a summing voltage can be generated via a summing current through the secondary windings.
BRIEF DESCRIPTION OF THE DRAWINGS The subject matter of the invention is explained in more detail below on the basis of preferred exemplary embodiments, which are illustrated in the appended drawings. In each case,
FIGS. 1-4 show an electronic power converter with different but analogous structure; FIG.
FIG. 5 shows a structure of a regulator for controlling a primary-side star-point voltage of such and similar power converters.
In principle, identical parts are provided with the same reference symbols in the figures.
[0012] FIGS. 1 to 4 show power converters with individual phase modules. One phase module is connected to a phase a, b, c, of an alternating voltage system with phase voltages Ujn, a, uin, b, uin, c with respect to a primary-side input star point N.
For the sake of simplicity, since a power flow from a source or a network on the primary side to a load on the secondary side often takes place, the primary side is also referred to here as the input side or input or the alternating voltage side and the secondary side as the output side or output or as the output side Voltage side. Notwithstanding this, the circuit described can also be used to provide a power flow in the device, provided that the switching devices are correspondingly designed with active switching elements.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an electronic power converter 1 with three partial transformers 2 a, 2 b, 2 c with a ratio N 1 Ng, wherein a primary winding of a partial transformer 2a, 2b, 2c is connected to an associated switching device 1a, 1b, 1c. Secondary-side windings of the partial transformers 2a, 2b, 2c with secondary voltages uA, uB, uc are connected in series, whereby a sum voltage u can be formed in the operation of the circuit via the windings on the DC side.
For each of the phases, the switching device 1a, 1b, 1c is adapted to control the respective associated phase voltage uc, a, uc, b, uc, c or the negative phase voltage or the voltage zero, Ie, for example, a short circuit, to the primary winding of the assigned partial transformer 2a, 2b, 2c. In the example shown, bridges 12 are shown, each with four-quadrant switches. In other embodiments, a diode bridge may be in the form of a rectifier and a subsequent bridge circuit with active switches (not shown). According to further embodiments, several bridge circuits can be connected in series on each side in the phase module, each of these bridge circuits feeding a primary side of a separate partial transformer,
An input phase current ia, ib, ic- can be arranged in the switching device 1a, 1b, Ic from the primary side, respectively. An input filter capacitance CF can be arranged for smoothing a respective bridge input voltage. In the example shown, this input filter capacitance CF is drawn in between an input phase connection 13 and a common star point Y of the switching devices 1a, 1b, 1c. The voltage at this star point Y is to be regulated.
[0018] An input filter inductance LF can be provided for smoothing a respective phase current; It can be part of the switching device 1a, 1b, 1c or part of an external circuit.
On the secondary side, the power converter has a rectifier 3 for rectifying the sum voltage u and an inductance L as a smoothing element 4 for smoothing a secondary-side current i. This secondary-side current i is therefore that which flows through the series circuit of the secondary-side windings of the partial transformers 2a, 2b, 2c. An output filter capacitance C may be arranged as a smoothing capacitance for forming a smoothed output voltage u0Ut at a load 16. FIG.
FIG. 2 shows, starting from the topology of FIG. 1, a variant of the electronic power converter. Therefore, only the differences are described: The variant has a load on a series LC resonant circuit, with the essentially ohmic load 16 parallel to the capacitance or a resonance circuit capacitor CR of the resonant circuit. Thus, given a suitable dimensioning and operating frequency of the elements, the current through the load is essentially independent of the resistance of the load 16. This arrangement is known for feeding lamps or other loads whose resistance depends on the operating state. The load is resonantly fed with the sum voltage u. Thus, the rectification of the sum voltage u is omitted and the circuit is simplified.
In connection with the invention described herein, the combination with a series LC resonant circuit as described above is advantageous because its inductance simultaneously serves to smooth or impress the secondary-side current i. This simplifies the structure of the combined circuit even further.
3 and 4 show dual versions of the topologies of FIGS. 1 and 2, and thus further variants of the electronic power converters. The duality has, inter alia, the following effects: The secondary windings of the partial transformers 2a, 2b, 2c and associated rectifier bridges 3a, 3b, 3c are not connected in series but in parallel. The inductance L as smoothing element 4 is not arranged on the secondary side between the transducer output and the load, as in FIGS. 1 and 2. Instead, the inductance L according to FIGS. 3 and 4 is divided into a respective phase smoothing element 4 'arranged between the respective phase connection or the connection of the respective input filter capacitance CF and the converter input (the inductance L thus influences the respective switching device 1a, 1c, the current, as opposed to the input filter inductance LF, whose current is distributed to the switching device 1a, 1b, 1c and the input filter capacitance CF). In the version of FIG. 4, the resonance circuit capacitor CR is not parallel to the load 16 but the resonant circuit coil Lr is connected in series to the load 16. The phase modules do not function as a buck-type converter but as a boost-type Converter).
FIG. 5 shows a regulator for regulating the output voltage at the load, and as a part of this regulator also the control of the star-point voltage at the input side. The regulator of the output voltage at the load operates as follows: The measured output voltage uout at the load is subtracted in a first summing element before a setpoint u * 0Ut of the output voltage at the load and a setpoint i * c for A current through the output filter capacitance C is formed. This set value i * c is added to a measured value of a load current iout in a second summing element and a setpoint value i * for a current i 'is thereby formed by the inductance L. This current i 'is equal to the output current of the converter (that is to its secondary side). A value of the measured corresponding current i 'is subtracted from this setpoint value i * in a third summing element, and a setpoint value u \ for a voltage is formed from the inductance L by a second controller. - This setpoint value u \ is added in a fourth summing element to the setpoint value u * out of the output voltage at the load, thereby forming a setpoint value u * for the output voltage of the converter. The set value u * for the output voltage of the converter is multiplied by the set value i * for the output current of the converter, and a setpoint p * for the output power of the converter is thereby formed. This output should be equal to the input power of the converter. The set value p * for the input or output power is determined by the sum of the squares of the input phase voltages u '
[0024] The following steps of the regulation or parts of the controller are implemented individually for each phase. In summary, the input phase currents ia, ib, ic are referred to as the input phase current iin. - The conductance g * is multiplied by the input phase voltage u'in, thereby forming a setpoint iin * for the input phase current.
In a conventional control, the desired value iin * is used for the input phase current iin as the input current set value for a current control 40. The converter is controlled with the current control 40 such that a current corresponding to the input current set point is recorded per phase. This can be realized in a known manner and, for example, in the following manner: The input current setpoint is divided by the output current i 'of the converter and the ratio of the transformer N1 / N2 of the transformers of the converter, thereby forming a modulation signal m. With this modulation signal, the output current i 'in the converter must be modulated by means of pulse width modulation in order to produce the respectively desired input phase current. For this purpose, a periodic carrier signal is generated by means of a carrier signal generator and is subtracted from the modulation signal in a sixth summing element and thereby a difference signal is formed. The switches of the switching device 1a, 1b, 1c of the corresponding phase are controlled in accordance with the sign of the difference signal and the sign of the corresponding input phase voltage u'in, and the input phase current corresponding to the input current setpoint value is thus realized over a period of the carrier signal.
The regulation explained above is applicable to arrangements according to FIGS. 1 and 2, that is to say those in which an inductance L is arranged as a smoothing element 4 between the converter output and the load. In arrangements according to FIGS. 3 and 4, that is to say with an inductance L as a smoothing element 4 between the phase connection and the converter input, the control is constructed in an analogous manner. The regulation of the star-point voltage, as will now be explained below, is in principle the same for all arrangements. The control can also be used generally for structures in which the input current is switched to switching devices 1a, 1b, 1c of individual phases.
For the regulation of the star-point voltage, a distinction is made in each phase between the input phase current iin (which flows into the input filter) and the input phase current i'in, which flows into the switching device 1a, 1b, 1c. The difference is the current which flows into the input filter capacitance CF and can thus be used to control the star-point voltage.
For this purpose, a modified setpoint value iin '* for the input phase current (which flows into the switching device 1a, 1b, 1c) is supplied to the current control 40 as an input current set point instead of the setpoint value iin * for the input phase current (which flows into the input filter). The modified setpoint value iin '* is generated by adding an offset current setpoint i * 0 in a fifth summing element to the desired value iin *. This current should flow into the input filter capacitances CF to the star point Y (or out) and thereby correct the star-point voltage. The offset current setpoint i * o is generated by a star-point voltage regulator. This regulator has as an input a deviation of the star-point voltage Un y from a desired value. The desired value is usually zero, and thus the star-point voltage itself is equal to this deviation, a calculation of the deviation is therefore not shown in FIG. As shown in FIG. 5, the deviation of the star-point voltage uN y can be determined as the difference in the voltage between the star point Y of the input filter capacitances CF and an artificial star point N '. The artificial star point N 'can in turn be formed by a symmetrical filter, in a simple variant as shown a star circuit of filter resistors R with the same ohm value from the connection points of the input filter capacitances CF. As a difference of the voltage between the star point Y of the input filter capacitances CF and an artificial star point N '. The artificial star point N 'can in turn be formed by a symmetrical filter, in a simple variant as shown a star circuit of filter resistors R with the same ohm value from the connection points of the input filter capacitances CF. As a difference of the voltage between the star point Y of the input filter capacitances CF and an artificial star point N '. The artificial star point N 'can in turn be formed by a symmetrical filter, in a simple variant as shown a star circuit of filter resistors R with the same ohm value from the connection points of the input filter capacitances CF.
Claims (4)
1. A method for controlling a star-point voltage (uN Y) in an electronic multi-phase power converter, the power converter comprising, for each phase, a phase module (1a, 2a; 1b, 2b; 1c, 2c) having an input side and an output side, Wherein the input current is controlled to a predetermined input current setpoint value, characterized in that a measured value is used to control the star point voltage (Un'y). (DE). Home services World Intellectual Property Organization In accordance with the star-point voltage (uNY), an offset current set-point value (i * 0) is formed from this measured value by means of a controller (33)And for each phase the offset current setpoint value (i * 0) is added to a desired value (iin *) for the input phase current of this phase, and thus the input current setpoint value (i '* n) is formed for this phase.
2. The method as claimed in claim 1, wherein the measured value (uN Y) is formed according to the star-point voltage by forming an artificial star point (Ν ') by means of a symmetrical filter and measuring the star point voltage with this artificial star point as a reference and measuring the measured value (uN Y).
3. The method as claimed in claim 1, wherein the measured value (un y) is formed according to the star-point voltage, by measuring the voltages of the phases and determining the measured value from these measurements by calculation.
4. The method according to claim 2, wherein the desired value (ijn *) for the input phase current of this phase is generated by a regulation for an output voltage of the power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH01545/13A CH708511B1 (en) | 2013-09-09 | 2013-09-09 | Method for controlling a neutral point voltage of an electronic power converter. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH01545/13A CH708511B1 (en) | 2013-09-09 | 2013-09-09 | Method for controlling a neutral point voltage of an electronic power converter. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CH708511A2 CH708511A2 (en) | 2015-03-13 |
| CH708511B1 true CH708511B1 (en) | 2017-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CH01545/13A CH708511B1 (en) | 2013-09-09 | 2013-09-09 | Method for controlling a neutral point voltage of an electronic power converter. |
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| Country | Link |
|---|---|
| CH (1) | CH708511B1 (en) |
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- 2013-09-09 CH CH01545/13A patent/CH708511B1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| CH708511A2 (en) | 2015-03-13 |
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