FI128737B - A converter device - Google Patents
A converter device Download PDFInfo
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- FI128737B FI128737B FI20185995A FI20185995A FI128737B FI 128737 B FI128737 B FI 128737B FI 20185995 A FI20185995 A FI 20185995A FI 20185995 A FI20185995 A FI 20185995A FI 128737 B FI128737 B FI 128737B
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- converter element
- power electronic
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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
- H02M7/42—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
- H02M7/493—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 the static converters being arranged for operation in parallel
-
- 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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A converter device comprises a first converter element (101), a second converter element (102), a first filter (103) having first terminals connected to terminals of the first converter element, and a second filter (104) having first terminals connected to terminals of the second converter element and second terminals connected to second terminals of the first filter. Controllable power electronic switches of the first converter element have smaller switching losses than controllable power electronic switches of the second converter elements, and the controllable power electronic switches of the second converter element have a higher maximum allowable current than the controllable power electronic switches of the first converter element. The first converter element can operate with a good efficiency when power is below a predetermined limit, whereas the second converter element is usable in situations where high current is needed.
Description
A converter device Field of the disclosure The disclosure relates to a converter device for transferring electric energy between systems having different voltages.
The converter device can be, for example but not necessarily, an inverter for transferring electric energy between a direct voltage system and an alternating voltage system.
Furthermore, the disclosure relates to a direct voltage distribution system.
Background In many cases, there is a need to transfer electric energy between systems having different voltages.
A typical example is a case where one or more parts of an electricity distribution system based on three-phase alternating voltage, such as e.g. 230/400 V, 50 Hz alternating voltage, is/are replaced with direct voltage distribution.
In this exemplifying case, the utilization of the direct voltage distribution opens new — possibilities for network development.
For example, with a same voltage drop and a same three-phase cable a 1.5 kV direct voltage system can transfer significantly more power than a 0.4 kV alternating voltage system.
A direct voltage distribution system comprises typically one or more transformers and one or more power electronic converters for transferring electric power between an alternating voltage supply network and a direct voltage distribution network.
The alternating voltage > supply network can be for example but not necessarily a 20 kV, 50 Hz three-phase N network, and the direct voltage distribution network can be for example but not 3 necessarily a £750 V bipolar direct voltage network or a 1500 V unipolar direct - voltage network.
The above-mentioned power electronic converters are E 25 advantageously capable of bi-directional power transfer between the alternating 3 voltage supply network and the direct voltage distribution network.
Furthermore, the co direct voltage distribution system comprises one or more inverters for transferring 2 electric power between the direct voltage distribution network and an alternating voltage network of each customer.
The above-mentioned inverters are advantageously capable of bi-directional power transfer between the direct voltage distribution network and the alternating voltage networks of the customers.
Component prices of power electronics have constantly been decreasing in the last decades allowing power electronic devices to be used in greater number of applications.
This development has improved the cost efficiency of direct voltage distribution systems of the kind described above.
Furthermore, the direct voltage power distribution enables improvement of customer's electricity quality with lower costs compared to alternating voltage distribution systems.
Direct voltage distribution systems of the kind described above are however not free from challenges.
One of the challenges is related to a requirement that an inverter of a direct voltage distribution system must be able to supply sufficiently high current to an alternating voltage network of a customer in peak-load and fault situations.
Typically, an inverter that can momentarily supply current substantially higher than nominal current has low efficiency at partial loads, and/or the price the inverter is high in terms of price per nominal power.
Therefore, there is a need for new inverter designs to further improve the cost efficiency of direct voltage distribution systems of the kind described above.
Summary The following presents a simplified summary in order to provide a basic understanding of some aspects of various embodiments.
The summary is not an o extensive overview of the invention.
It is neither intended to identify key or critical > elements of the invention nor to delineate the scope of the invention.
The following 2 summary merely presents some concepts in a simplified form as a prelude to amore © detailed description of exemplifying embodiments.
E 25 In accordance with the invention, there is provided a new converter device for 3 transferring electric energy between systems having different voltages.
The co converter device can be, for example but not necessarily, an inverter for transferring 2 electric energy between a direct voltage system and an alternating voltage system.
The direct voltage system can be for example a direct voltage distribution network and the alternating voltage system can be for example an alternating voltage network of a customer i.e. an end-user of electricity. A converter device according to the invention comprises: - at least one first converter element for converting one or more first voltages, e.g. a direct voltage, into one or more second voltages, e.g. three-phase alternating voltages, being at terminals of the first converter element, - at least one second converter element for converting the one or more first voltages into one or more third voltages being at terminals of the second converter element, - a first filter having first terminals connected to the terminals of the first converter element, and - a second filter having first terminals connected to the terminals of the second converter element and second terminals connected to second terminals of the first filter, wherein: - controllable power electronic switches of the above-mentioned first and second converter elements have been selected so that the controllable power electronic switch or switches of the first converter element has or have smaller switching losses than the controllable power electronic switch or switches of the second converter element, and the controllable power o 20 electronic switch or switches of the second converter element have a higher > maximum allowable current than the controllable power electronic switch or 2 switches of the first converter element,
O - - the first converter element is a first inverter bridge and each of the one or E more second voltages is alternating voltage, and the second converter 3 25 element is a second inverter bridge and each of the one or more third
LO © voltages is alternating voltage,
- the first filter comprises first serial coils between the first and second terminals of the first filter, and the second filter comprises second serial coils between the first and second terminals of the second filter, and - inductances of the second serial coils are smaller than inductances of the first serial coils.
The above-mentioned first inverter bridge can be used for transferring power with good efficiency from e.g. a direct voltage distribution network to e.g. an alternating voltage network of a customer when the power is small or at least below a predetermined limit, whereas the second inverter bridge is used for transferring power from the direct voltage distribution network to the alternating voltage network of the customer during temporary peak-load situations and during fault situations where high current is needed. In accordance with the invention, there is provided also a new direct voltage distribution system that comprises: - a direct voltage distribution network, - at least one network converter for transferring electric power between an alternating voltage supply network and the direct voltage distribution network, and - at least one converter device according to the invention, wherein the o 20 converter device is an inverter for transferring electric power between the > direct voltage distribution network and at least one alternating voltage 3 network of a customer.
2 - Various exemplifying and non-limiting embodiments are described in accompanied E dependent claims.
3 3 25 Exemplifying and non-limiting embodiments both as to constructions and to methods > of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific exemplifying and non-limiting embodiments when read in conjunction with the accompanying drawings.
The verbs “to comprise” and “to include” are used in this document as open limitations that neither exclude nor reguire the existence of unrecited features. The features recited in dependent claims are mutually freely combinable unless otherwise explicitly stated. Furthermore, it is to be understood that the use of “a” or 5 "am, i.e. a singular form, throughout this document does not exclude a plurality. Brief description of figures Exemplifying and non-limiting embodiments and their advantages are explained in greater detail below in the sense of examples and with reference to the accompanying drawings, in which: figures 1a, 1b, and 1c illustrate a converter device according to an exemplifying and non-limiting embodiment, figures 2a, 2b, and 2c illustrate a converter device according to another exemplifying and non-limiting embodiment, and figure 3 illustrates a direct voltage distribution system according to an exemplifying and non-limiting embodiment. Description of exemplifying embodiments The specific examples provided in the description given below should not be construed as limiting the scope and/or the applicability of the appended claims. Lists and groups of examples provided in the description given below are not exhaustive = 20 unless otherwise explicitly stated.
N 3 Figure 1a illustrates schematically a converter device 100 according to an 2 exemplifying and non-limiting embodiment. In this exemplifying case, the converter E device 100 is an inverter for transferring electric energy between a direct voltage 10 system and an alternating voltage system. The converter device 100 comprises a 3 25 first converter element 101 for converting first voltage Upc into second voltages > being at terminals a1, b1, and c1 of the first converter element 101. The converter device 100 comprises a second converter element 102 for converting the first voltage Upc into third voltages being at terminals a2, b2, and c2 of the second converter element 102. In this exemplifying case, the first voltage Upc is direct voltage and the converter elements 101 and 102 are inverter bridges configured to convert the direct voltage into three-phase alternating voltages. It is also possible that a converter device according to an exemplifying and non-limiting embodiment is configured to convert direct voltage into single-phase alternating voltage. Furthermore, it is also possible that a converter device according to an exemplifying and non-limiting embodiment is configured to convert one or more alternating voltages into one or more other alternating voltages, i.e. the converter device can be a frequency converter. In this exemplifying case, the converter device may comprise a converter element such as a rectifier for transferring electric energy from an alternating voltage network to direct voltage capacitors. The converter device 100 comprises a first filter 103 having first terminals connected to the terminals a1, b1, and c1 of the first converter element 101. The converter device 100 comprises a second filter 104 having first terminals connected to the terminals a2, b2, and c2 of the second converter element 102 and second terminals connected to second terminals L 1, L2, and L3 of the first filter 103. Figure 1b shows the main circuit of the first converter element 101, and figure 1c shows the main circuit of the second converter element 102. As shown in figure 1b, the first converter element 101 is a three-level inverter bridge that comprises three inverter legs connected to the terminals a1, b1, and c1, and a fourth inverter leg 109 connected to a first middle-point voltage terminal n1. Correspondingly, as shown in figure 1c, the second converter element 102 is a three-level inverter bridge that comprises o three inverter legs connected to the terminals a2, b2, and c2, and a fourth inverter S leg 110 connected to a second middle-point voltage terminal n2. As shown in figures 3 25 1b and 1c, the main circuits of the first and second converter elements 101 and 102 2 comprise controllable power electronic switches and diodes. In figure 1b, two of the E controllable power electronic switches of the first converter element 101 are denoted O with references 105 and 106. In figure 1c, two of the controllable power electronic 3 switches of the second converter element 102 are denoted with references 107 and > 30 108.
The controllable power electronic switches of the first and second converter elements 101 and 102 have been selected so that the controllable power electronic switches of the first converter element 101 have smaller switching losses than controllable power electronic switches of the second converter element 102, and the controllable power electronic switches of the second converter element 102 have a higher maximum allowable current than the controllable power electronic switches of the first converter element 101. Therefore, the first converter element 101 can be used for transferring power with good efficiency when the power is small or at least below a predetermined limit, whereas the second converter element 102 can be used for transferring power during temporary peak-load situations and during fault situations where high current is needed.
A converter device according to an exemplifying and non-limiting embodiment comprises two or more first converter elements of the kind described above and/or two or more second converter elements of the kind described above. The first converter elements can be run in parallel for transferring power with good efficiency when the power is small or at least below a predetermined limit, whereas the second converter elements can be run in parallel for transferring power during temporary peak-load situations and during fault situations where high current is needed.
A converter device according to an exemplifying and non-limiting embodiment comprises a direct voltage-to-direct voltage converter element, i.e. a DC-DC converter element, for controlling the direct voltage supplied to the first and second converter elements 101 and 102 shown in figure 1a. The DC-DC converter element is not shown in figure 1a. In a converter device according to an exemplifying and non-limiting embodiment, the above-mentioned DC-DC converter element is = configured to provide galvanic isolation. In this exemplifying case, a need for a N transformer between the converter device and an alternating voltage system can be = 25 avoided in many applications where the converter device is arranged to transfer = electric energy between a direct voltage system and the alternating voltage system. a 12 In the exemplifying inverter illustrated in figures 1a-1c, the controllable power 3 electronic switches of the first converter element 101 are silicon carbide metal oxide 2 field effect transistors “SiC MOSFET” and the controllable power electronic switches of the second converter element 102 are insulated gate bipolar transistors “IGBT”. For another example, the controllable power electronic switches of the first converter element 101 can be Gallium-Nitride “GaN” components and the controllable power electronic switches of the second converter element 102 can be IGBTs or SiC MOSFETs. In the above-mentioned exemplifying cases, the controllable power electronic switches of the first converter element 101 have a semiconductor structure different from a semiconductor structure of the controllable power electronic switches of the second converter element 102, i.e. the controllable power electronic switches of the first converter element 101 are of different type than the controllable power electronic switches of the second converter element 102. It is however also possible that the controllable power electronic switches of the first and — second converter elements 101 and 102 are of a same type. For example, all the controllable power electronic switches can be IGBTs but the IGBTs of the first converter element 101 have been designed to have a smaller maximum current and thereby smaller switching losses than the IGBTs of the second converter element
102. In the exemplifying case illustrated in figures 1a-1c, each of the first and second converter elements 101 and 102 has many controllable power electronic switches. In an exemplifying case where a converter device according to an exemplifying and non-limiting embodiment is a DC-DC converter, each of the first and second converter elements can be, for example but not necessarily, a buck or boost converter having only one controllable power electronic switch. In the exemplifying converter device illustrated in figures 1a-1c, the first filter 103 comprises first serial coils 111 connected between the first converter element 101 and the terminals L1, L2, and L3. Furthermore, in this exemplifying case, the first o filter 103 further comprises capacitors 112 connected to the terminals L1, L2, and S L3. The second filter 104 comprises second serial coils 113 connected between the 3 25 second converter element 102 and the terminals L1, L2, and L3. In cases where 2 more damping is needed in addition to damping provided by losses of the serial coils E 111 and 113, damping resistors can be added to be in series with the serial coils. O The damping resistors are not shown in figure 1a. Inductances of the second serial 3 coils 113 can be smaller than inductances of the first serial coils 111 because > 30 currents of the second serial coils 113 are greater than currents of the first serial coils 111. In cases where the coils have ferromagnetic cores, a linearizing airgap is advantageously wider in the ferromagnetic cores of the second serial coils 113 than in the ferromagnetic cores of the first serial coils 111. Widening a linearizing airgap decreases the inductance but, on the other hand, increases a saturation limit i.e. the maximum current which does not saturate the ferromagnetic core. Despite the greater currents of the second serial coils 113, the physical sizes of second serial coils 113 can be about the same as the physical sizes of first serial coils 111 because thermal loading of the second serial coils 113 is more bursty and occurs more rarely than that of the first serial coils 111. Thus, the heat capacity of materials can be utilized more in the thermal design of the second serial coils 113 than in the thermal design of the first serial coils 111.
In the exemplifying converter device illustrated in figures 1a-1c, the above- mentioned capacitors 112 are star-connected, the first middle-point voltage terminal n1 of the first converter element 101 is connected to a star-point of the star- connected capacitors via a coil 116, and the second middle-point voltage terminal n2 of the second converter element 101 is connected to the star-point via a coil 117.
Furthermore, in the exemplifying converter device illustrated in figures 1a-1c, a middle point of a direct voltage capacitor system of the inverter is connected to the star-point of the star-connected capacitors 112. In a case where the inverter is connected to star-connected transformer windings, a terminal N shown in figure 1a can be connected to a star-point of the transformer windings. The first and/or second — middle-point voltage terminal ni and/or n2 can be used for supplying current when there is a non-symmetric load so that the sum of the phase currents deviates from zero. The coil 116 can be a part of a same mechanical device that implements the o first serial coils 111. Correspondingly, the coil 117 can be a part of a same S mechanical device that implements the second serial coils 113. It is also possible 3 25 that the coil 116 is a separate device with respect to the coils 111 and/or the coil 2 117 is a separate device with respect to the coils 113. In exemplifying cases where E the first and second converter elements 101 and 102 are operated in a temporally O non-overlapping way, the coils 116 and 117 can be replaced with a single coil so 3 that the first and second middle-point voltage terminals n1 and n2 are directly > 30 connected to each other and to a first terminal of the coil and a second terminal of the coil is connected to the terminal N and to the star-point of the star-connected capacitors 112.
Figure 2a illustrates schematically a converter device 200 according to an exemplifying and non-limiting embodiment. In this exemplifying case, the converter device is an inverter for transferring electric energy between a direct voltage system and an alternating voltage system. The converter device 200 comprises a first converter element 201 for converting direct voltage Upc into three-phase alternating phase-voltages. The converter device 200 comprises a second converter element 202 for converting the direct voltage Upc into three-phase alternating voltages. The converter device 200 is otherwise similar to the converter device 100 but the first and second converter elements 201 and 202 are two-level inverter bridges whereas the converter elements 101 and 102 of the converter device 100 are three-level inverter bridges. Figure 2b shows the main circuit of the first converter element 201, and figure 2c shows the main circuit of the second converter element 202.
In addition to the main circuits illustrated in figures 1a-1c and 2a-2c, each of the converter devices 100 and 200 comprises, among others, driver circuits for driving — the controllable power electronic switches and a control system for controlling the operation of the converter device. The control system may comprise for example sensors, e.g. voltage and/or current sensors, and a data interface for receiving control data and/or for transmitting data indicative of an operational status of the converter device. Furthermore, the control system comprises a data processing system communicatively connected to other parts of the control system. The data processing system can be implemented with one or more processor circuits each of which can be a programmable processor circuit, e.g. a digital signal processor o “DSP”, provided with appropriate software, a dedicated hardware processor such S as for example an application specific integrated circuit "ASIC”, or a configurable 3 25 hardware processor such as for example a field programmable gate array “FPGA”. 2 Furthermore, the data processing system may comprise one or more memory E circuits each of which can be for example a random-access memory “RAM”. Figure 3 illustrates a direct voltage distribution system according to an exemplifying © and non-limiting embodiment. The direct voltage distribution system comprises a N 30 direct voltage distribution network 350 and a network converter 351 for transferring electric power between an alternating voltage supply network 352 and the direct voltage distribution network 350. It is also possible that there are two or more network converters for transferring electric power between the alternating voltage supply network 352 and the direct voltage distribution network 350. The direct voltage distribution system comprises converter devices 300, 320, and 330 for transferring electric power between the direct voltage distribution network 350 and alternating voltage networks 354, 355, and 356 of customers. In this exemplifying case, the converter device 300 is like the converter device 100 illustrated in figures 1a-1c. The middle-point voltage terminals n1 and n2 of the converter device 300 are connected via coils 116 and 117 to a star-point of a transformer 353. The middle- point voltage terminals n1 and/or n2 can be used for supplying current when the alternating voltage network 354 loads the transformer 353 non-symmetrically so that the sum of phase currents deviates from zero. The converter devices 320 and 330 can be for example like the converter device 100 illustrated in figures 1a-1c or the converter device 200 illustrated in figures 2a-2c.
The specific examples provided in the description given above should not be construed as limiting the applicability and/or the interpretation of the appended claims. Lists and groups of examples provided in the description given above are not exhaustive unless otherwise explicitly stated.
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Claims (10)
1. A converter device (100, 200, 300) comprising: - at least one first converter element (101, 201) for converting one or more first voltages into one or more second voltages being at terminals (a1, b1, c1) of the first converter element, - at least one second converter element (102, 202) for converting the one or more first voltages into one or more third voltages being at terminals (a2, b2, c2) of the second converter element, - afirstfilter (103) having first terminals connected to the terminals (a1, b1, c1) of the first converter element, and - a second filter (104) having first terminals connected to the terminals (a2, b2, c2) of the second converter element and second terminals connected to second terminals (L1, L2, L3) of the first filter, wherein: - controllable power electronic switch or switches (105, 106) of the first converter element has or have smaller switching losses than controllable power electronic switch or switches (107, 108) of the second converter element, and the controllable power electronic switch or switches of the second converter element has or have a higher maximum allowable current = 20 than the controllable power electronic switch or switches of the first converter
N 3 element, <Q 2 - the first converter element (101, 201) is a first inverter bridge and each of the I . .
= one or more second voltages is alternating voltage, and the second converter 10 element (102, 202) is a second inverter bridge and each of the one or more 3 25 third voltages is alternating voltage, and
O N - the first filter comprises first serial coils (111) between the first and second terminals of the first filter, and the second filter comprises second serial coils (113) between the first and second terminals of the second filter,
characterized in that inductances of the second serial coils are smaller than inductances of the first serial coils.
2. A converter device according to claim 1, wherein each of the controllable power electronic switch or switches of the first converter element is a silicon carbide metal oxide field effect transistor “SiC MOSFET’, a Gallium-Nitride “GaN” component, or an insulated gate bipolar transistor “IGBT”, and wherein each of the controllable power electronic switch or switches of the second converter element is a silicon carbide metal oxide field effect transistor “SiC MOSFET”, a Gallium-Nitride “GaN” component, or an insulated gate bipolar transistor *IGBT”.
3. A converter device according to claim 1 or 2, wherein the controllable power electronic switch or switches (105, 106) of the first converter element has or have a semiconductor structure different from a semiconductor structure of the controllable power electronic switch or switches (107, 108) of the second converter element.
4. A converter device according to claim 1, wherein the first inverter bridge comprises an inverter leg (109) having a first middle-point voltage terminal (n1), and the second inverter bridge comprises an inverter leg (110) having a second middle- point voltage terminal (n2).
5. A converter device according to any of claims 1-4, wherein the first filter comprises capacitors (112) connected to the second terminals of the first filter.
6. Aconverter device according to claim 5, wherein the capacitors (112) are star- > connected, the first inverter bridge comprises an inverter leg (109) having a first N middle-point voltage terminal (n1) connected to a star-point of the star-connected 3 capacitors, and the second inverter bridge comprises an inverter leg (110) having a - second middle-point voltage terminal (n2) connected to the star-point of the star- E 25 connected capacitors, current paths from the first and second middle-point voltage 3 terminals to the star-point comprising at least one inductor coil (116, 117). co D
7. A converter device according to claim 6, wherein a middle point of a direct N voltage capacitor system of the inverter is connected to the star-point of the star- connected capacitors of the first filter.
8. A converter device according to any of claims 1-7, wherein the first inverter bridge is a three-level inverter bridge and the second inverter bridge is a three-level inverter bridge.
9. Adirect voltage distribution system comprising: - a direct voltage distribution network (350), - at least one network converter (351) for transferring electric power between an alternating voltage supply network (352) and the direct voltage distribution network, and - at least one converter device (300, 320, 330) according to any of claims 1-8 for transferring electric power between the direct voltage distribution network and at least one alternating voltage network (354, 355, 356) of a customer.
10. A direct voltage power distribution system according to claim 9, wherein the converter device (300, 320, 330) is according to claim 4 or 6 or 7, and the first and second middle-point voltage terminals (n1, n2) are arranged to supply/draw current to/from a star-point of a transformer (353) of the alternating voltage network of the customer. oO
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20185995A FI128737B (en) | 2018-11-23 | 2018-11-23 | A converter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20185995A FI128737B (en) | 2018-11-23 | 2018-11-23 | A converter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI20185995A1 FI20185995A1 (en) | 2020-05-24 |
| FI128737B true FI128737B (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI20185995A FI128737B (en) | 2018-11-23 | 2018-11-23 | A converter device |
Country Status (1)
| Country | Link |
|---|---|
| FI (1) | FI128737B (en) |
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2018
- 2018-11-23 FI FI20185995A patent/FI128737B/en active IP Right Grant
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| Publication number | Publication date |
|---|---|
| FI20185995A1 (en) | 2020-05-24 |
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