WO2018104174A1 - Convertisseur à haut rendement pour systèmes monophasés - Google Patents

Convertisseur à haut rendement pour systèmes monophasés Download PDF

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Publication number
WO2018104174A1
WO2018104174A1 PCT/EP2017/081211 EP2017081211W WO2018104174A1 WO 2018104174 A1 WO2018104174 A1 WO 2018104174A1 EP 2017081211 W EP2017081211 W EP 2017081211W WO 2018104174 A1 WO2018104174 A1 WO 2018104174A1
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WO
WIPO (PCT)
Prior art keywords
circuit
filter
power
voltage
bridges
Prior art date
Application number
PCT/EP2017/081211
Other languages
German (de)
English (en)
Inventor
Marvin TANNHÄUSER
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2018104174A1 publication Critical patent/WO2018104174A1/fr

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Classifications

    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped 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
    • 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
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck

Definitions

  • the invention relates to a circuit for a power converter for single-phase systems as well as a method for combining scarf ⁇ tung a DC system having an AC ⁇ system with at least one such circuit.
  • Such a circuit is used, for example, in an exchange ⁇ judge for use in photovoltaics.
  • String ie a series of solar modules of the plant, or even only for a single solar module (then as a so-called micro solar inverter or micro inverter).
  • Other applications for power converters include, for example, electric vehicles, hybrid vehicles, rail vehicles and charging stations for electric vehicles.
  • power converters are used in energy storage applications, for example in the field of renewable energies, or in auxiliary power supplies and in power supplies. As a power converter is here called an arrangement for converting an electric current into another.
  • a ⁇ such power converter is preferably in the Georgiaschal ⁇ tion of a DC system, for example with a DC voltage of 450 V, with an AC system, for example with an AC voltage of 230 V, used, depending on the power flow direction of the converter operated as an inverter or as a rectifier becomes.
  • An inverter is an electrical device that converts that DC voltage into AC voltage ⁇ .
  • a rectifier is an electrical device which has AC voltage in
  • the power converter can be used here as a rectifier as well as an inverter.
  • a single-phase system has a phase conductor and a neutral, with the neutral being preferably grounded. Another embodiment is a so-called
  • Single-phase three-wire network or in English "split-phase” or “single-phase three-wire” system, which is preferably used in the United States of America for single-family households and small businesses.
  • the single-phase three-wire network is based on a single-phase system, with the aid of a transformer which preferably has a center tap for the neutral phase on the secondary side, two opposite-phase signals, ie with a 180 ° phase offset, are generated on two conductors.
  • EP 2 136 465 A1 discloses an inverter for feeding a power of a DC voltage source, in particular a photovoltaic generator, into an AC voltage network having an asymmetrically clocked bridge circuit with at least two first switches clocked at mains frequency and with at least two second switches clocked at a higher clock frequency known.
  • a converter circuit for single-phase systems is proposed, which has a 3-point power converter and a downstream 2-point converter.
  • EP 2 306 629 A1 discloses a 5-point converter
  • Circuit for three-phase systems known which combines three Halbbrü ⁇ bridges and an AC switch.
  • the invention has for its object to provide a power converter circuit for single-phase systems, which has improved properties in terms of EMC compared to the prior art.
  • the power converter circuit comprises a first circuit, a second circuit and a filter circuit.
  • the first circuit on closing contacts for connection to a DC voltage, between which an intermediate circuit with a series circuit of two capacitors and parallel to the intermediate circuit two series-connected first half-bridges are arranged.
  • the intermediate circuit is designed as a divided intermediate circuit and is provided for establishing a center point of an intermediate circuit voltage at the point located between the capacitors. The potential points between the capacitors and between the first half-bridges are connected to each other.
  • the filter circuit includes first terminals between which a series of a first filter inductor, a Fil ⁇ terkondensator and a second filter is maral ⁇ tet, wherein the first terminals are connected to the midpoints of the first two half-bridges.
  • the filter circuit further comprises second terminals at the points between the filter capacitor and the first and between the filter capacitor and the second filter inductor.
  • the second circuit has two parallel second half bridges whose centers form AC voltage outputs.
  • the outer potential points of the second half-bridges are connected to the second terminals of the filter circuit.
  • the power converter circuit and the method of the invention are preferably used in network applications, for example photovoltaics, in particular as micro solar inverters for individual solar modules and energy storage applications, as well as in electric vehicles, hybrid vehicles and vehicles for rail traffic. Further areas of application are auxiliary power supplies and power supplies.
  • the invention provides a power converter circuit with a natively sinusoidal output voltage.
  • a further advantage is that such a converter circuit is readily suitable for parallel connection with other, for example, similar converter circuits. As a result, the achievable with the circuit power range - while maintaining the components used - significantly expanded.
  • the region of the circuit in which a pulse-width-modulated voltage occurs with high-frequency voltage changes is narrowly limited.
  • Pulse width modulated voltage occurs only in the Leitererberei ⁇ Chen between the filter inductors and the directly connected switches of the first half-bridges.
  • the area of the circuit with high EMC radiation by the placement of the internal filter is advantageously narrowly limited to two short conductor pieces.
  • These can be well provided with a shield, for example by being arranged in a multi-layer board in a middle layer between shielding metal surfaces.
  • the switches of the second circuit are not in the range of high switching frequencies. Rather, the voltage is already before the switches of the second circuit through the Fil- smoothed. This reduces the burden of
  • the circuit can be operated bidirectionally by the circuit topology according to the invention, that is, depending on the power flow as a rectifier and / or as an inverter.
  • the embodiment according to claim 1 can be combined with the features of one of the subclaims or preferably also with de ⁇ nen of several subclaims. Accordingly, the following additional characteristics can be provided for the power converter circuit:
  • the two series-connected capacitors of the intermediate circuit may also consist of several, for example in series or in parallel condensers ⁇ reindeer, consist in each case. This may be necessary if there is no capacitor specified for the required current and / or voltage.
  • the capacitors can have the same capacitance values.
  • the intermediate circuit which is divided symmetrically by the use of equal capacitance values, divides the DC link voltage symmetrically about the center point. Therefore, the same power semiconductors can be used in the first half bridges, which are uniformly and optimally controlled. This increases the efficiency of the power converter circuit and reduces the complexity.
  • the filter circuit may comprise a second filter capacitor between the filter capacitor and the second filter inductor, wherein the potential point between the filter capacitors is connected to the potential point between the first half-bridges of the first circuit.
  • the filter circuit may include a third filter capacitor between an upper one of the first terminals and an upper one of the second terminals, and a fourth filter capacitor between a lower one of the first terminals and a lower one of the second terminals.
  • the first circuit may comprise power semiconductors, which are provided for a modulation of the AC voltage.
  • the second circuit may include power semiconductors that are provided for clocking at a lower fundamental frequency. For example, while the modulation frequency of the AC voltage is in the range of several kHz to several MHz, the fundamental frequency is 50 Hz. Since the power semiconductors are provided for different tasks at different frequencies within the power converter circuit, the specified circuit topology allows use of adjusted bathlei ⁇ you. This is advantageous because the efficiency of the converter circuit increases as a result of the use of power semiconductors adapted to the task.
  • the power semiconductors of the first circuit can be optimized with regard to low switching losses.
  • the power semiconductors of the second circuit can be optimized with regard to low forward losses.
  • An essential factor for limiting the achievable efficiency lies in the losses that occur in the power semiconductors used.
  • the switching losses are playing at the moment the opening and closing of the switch occur and increase with the switching frequency used, as well as the forward losses, the auftre ⁇ th in the conductive state of the switch, a role.
  • the power semiconductors such as MOSFETs, IGBTs or GaN HEMT switch with respect to the
  • the power semiconductors of the first circuit can have a dielectric strength which corresponds to at least half the intermediate circuit voltage.
  • the power semiconductors of the second circuit may have a dielectric strength which corresponds at least to the entire intermediate circuit voltage. This is made possible by the circuit topology with the divided intermediate circuit, which acts as a capacitive voltage divider and clamping ⁇ at preferably the same capacitance values the DC link voltage divides symmetrically around the center point. At a given switching frequency generating power semiconductor, which have a higher dielectric strength and are there ⁇ forth suitable for switching high voltages, signifi- cantly higher switching losses than the power semiconductors, which have a lower withstand voltage.
  • the specified circuit topology allows the power semiconductors of the first circuit to have only a voltage resistance which corresponds to half the intermediate circuit voltage. Since the adapted power semiconductors are optimally used in each case, this results in a high efficiency of the converter circuit.
  • the power semiconductors of the first circuit are preferably GaN switches. These allow very high
  • the power semiconductors of the first circuit can be driven with a frequency of more than 100 kHz.
  • a high switching speed makes it possible to reduce the size of the filter elements.
  • the first capacitor and the first half-bridge may be formed as a first commutation cell
  • Capacitor and the second half-bridge may be formed as a second commutation cell.
  • commutation be ⁇ draws in the power electronics, the process in which a current flow passes from one branch to the other.
  • the commutation takes place, for example during operation as an inverter, from the first capacitor to the first half-bridge connected in parallel thereto and from the second capacitor to the second half-bridge connected in parallel thereto.
  • the formation of a commutation cell In particular, by a low-inductance arrangement of the compo ⁇ elements is advantageous because so a very good Kommut réellesver ⁇ hold and switching behavior is achieved, which increases the efficiency of the present circuit.
  • the power semiconductor of the first circuit are preferably driven by a pulse width modulation and reversed the power semiconductor of the second circuit with a lower fundamental frequency.
  • the first half-bridges are always appropriately switched so that one of the power half ⁇ conductor is turned on, while the other power semiconductor ⁇ conductor is turned off.
  • the power semiconductor of the first circuit can be controlled so that they switch synchronously. In other words, a switching of the power semiconductors of the first two half bridges of the first circuit happens simultaneously. In this mode of operation, therefore, the voltage between the first circuit and the filter circuit always changes between the full value of the intermediate circuit voltage and zero, i. an amalgamation of the midpoint potential. In this case, either the two outer power semiconductors of the two first half bridges are switched on at one time or the two inner power semiconductors of the two first half bridges are switched on. This switching operation advantageous common-mode noise of the power converter circuit are greatly reduced.
  • the first power semiconductor circuit can be controlled such that the power semiconductors of the upper first half-bridge alternately with the linengurlei ⁇ tern of the lower first half-bridge switch.
  • a Controlling the power semiconductors by means of the carrier signal may be achieved against ⁇ on the upper first half-bridge, for example, by a corresponding phase shift ⁇ bung of the carrier signal for the lower first half bridge.
  • the voltage applied to the input of the filter circuit voltage changes in this switching mode between the full DC link voltage, half the DC link voltage and zero.
  • the resulting switching frequency is doubled compared to the switching frequency with synchronous switching of the half-bridges.
  • the size of the filter inductors used in the filter circuit can be reduced because the filter effect is inversely proportional to the frequency of the signal.
  • FIG. 1 shows a block diagram of a detail of a photovoltaic system
  • FIG. 2 shows a circuit diagram of an embodiment of the converter circuit for single-phase systems according to the invention
  • FIG. 8 is a timing diagram of the switching state for various half-bridges of the power converter circuit;
  • FIG. 8 is a timing diagram of a voltage generated within the power converter circuit;
  • FIG. 9 shows a block diagram of an embodiment of an energy storage system
  • FIGS. 10 and 11 Circuit diagrams of further embodiments of the converter circuit according to the invention.
  • the photovoltaic system 10 comprises a series of solar modules IIa, IIb, of which only two are shown here for the sake of clarity.
  • Each of the modules Solarmo ⁇ IIa, IIb is connected to MPP tracking with an inventive power converter circuit 20 via a DC / DC converter 12 from the direct current of the respective solar module IIa, IIb generates a single-phase AC voltage.
  • the single-phase AC voltage preferably has the frequency f G of the supply network, for example 50 Hz or 60 Hz.
  • the AC voltage outputs 25a, 25b of the power converter circuits 20 are connected in parallel with each other.
  • FIG. 2 shows a circuit diagram of an embodiment of the converter circuit 20 according to the invention for single-phase systems, wherein the converter circuit 20 comprises a first circuit 21, a second circuit 22 and a filter circuit 23.
  • the power converter circuit 20 is connected between a DC voltage system 1 and an AC voltage system, not shown in FIG.
  • the power converter circuit to ⁇ holds 20 connecting contacts 24a, 24b for connection to the DC voltage and AC voltage system 1 contacts 25a, 25b for connection using the exchange ⁇ selpressivessystem.
  • the first circuit 21 comprises two series-connected half-bridges 26a, 26b. Parallel to the half bridges 26a, 26b, an intermediate circuit 27 is arranged, which has a series connection of two capacitors C1, C2. The outer connec ⁇ se of the two half-bridges 26a, 26b are connected with the contacts 24a, 24b, and thus form the DC-
  • the intermediate circuit 27 is designed as a shared intermediate circuit and provided for Her ⁇ position of a midpoint M of an intermediate circuit voltage UZK located between the capacitors Cl, C2 and the half-bridges 26a, 26b potential point.
  • the first capacitor Cl is connected in parallel to the upper half-bridge 26a and the second capacitor C2 parallel to the un ⁇ direct half-bridge 26b connected.
  • the first capacitor Cl and the first half-bridge 26a are formed as a first commutation cell Kl, and the second capacitor C2 and the second half-bridge 26b are formed as a second commutation cell K2, thereby minimizing parasitic effects mainly due to parasitic inductances between a capacitor Cl, C2 and the parallel-connected half-bridge 26a, 26b are caused.
  • the filter circuit 23 includes first and second filter inductances 28a, 28b.
  • a first terminal of the first filter inductor 28a is connected to the potential point between the power semiconductors T1, T2 of the first half-bridge 26a.
  • a first terminal of the second filter inductor 28b is connected to the potential point between the power semiconductors T3, T4 of the second half-bridge 26b.
  • Each connected together at their ⁇ terminals of the filter inductors 28a, 28b are connected via a filter capacitor 29th
  • the filter inductors 28a, 28b advantageously have the same Induk ⁇ tivity.
  • the second circuit 22 comprises a full bridge of two parallel half-bridges 30a, 30b.
  • the upper outer terminal of the half bridges 30a, 30b is connected to the potential point between the first filter inductor 28a and the filter capacitor 29.
  • the lower outer terminal of the half-bridges 30a, 30b is connected to the potential point between the second filter Inductance 28 a and the filter capacitor 29 connected.
  • the potential point between the power semiconductors T5, T6 of the first half-bridge 30a is connected to the first change ⁇ pan VietnamesesWallet 25a, while the potential point between the power semiconductors T7, T8 of the second half-bridge 30a is connected to the second ac voltage contact 25b.
  • the power converter circuit 20 operates with power electronic ⁇ African switches Tl ... 8, for example, as insulated gate bipolar transistors (IGBT), metal oxide semiconductor field effect transistors (MOSFET) or gallium nitride high
  • Electron mobility transistors can be executed.
  • Figures 2 and 3 show IGBTs as adoselekt ⁇ tronic switch Tl ... 8, but this is by way of example and it gron- NEN other types of switches may be used.
  • the switch Tl used ... 8 can also failed ⁇ , for example, 26a in the half bridges, 26b of the first circuit 21 fast-switching GaN switches are used, while in the half-bridge 30a, 30b of the second
  • Circuit 22 IGBTs are used.
  • the power semiconductors T 1, T 2, T 3, T 4 of the first circuit 21 are for a modulation, preferably one
  • Pulse width modulation, short PWM provided with a clock which has a significantly higher frequency than the fundamental frequency f G.
  • Circuit 21 dominant over the forward losses and therefore power semiconductors Tl, T2, T3, T4 are selected for the first circuit 21, which are optimized in terms of low switching losses.
  • the circuit topology according to the invention of the power converter circuit 20 furthermore allows power semiconductors T 1, T 2, T 3, T 4 for the first circuit 21 use, which have a dielectric strength equal to half the intermediate circuit voltage UZK.
  • the power semiconductors T5, T6, T7, T8 of the second circuit 22 are provided for clocking at the fundamental frequency f G. Since at this much lower switching frequency f G the
  • Transient losses of the power semiconductors T5, T6, T7, T8 are dominant in comparison to the switching losses, power semiconductors T5, T6, T7, T8 are selected for the second circuit 22, which are optimized with regard to low forward losses. Due to the circuit topology 22 power semiconductors T5, T6, T7, T8 are used with a dielectric strength, which corresponds to the whole Zwi ⁇ circuit voltage UZK for the second circuit. But this is not a disadvantage, since the power semiconductor T5, T6, T7, T8 of the two ⁇ th circuit 22 does not need to switch quickly.
  • FIG. 3 shows a detail of the circuit diagram of the embodiment of the converter circuit 20 according to the invention according to FIG. 2.
  • the two half bridges 26a, 26b and the filter inductors 28a, 28b are shown.
  • FIG. 3 also shows two regions 31, 32 in the conductor structure of the power converter circuit 20.
  • the high-frequency voltage changes which are produced by the polarity reversal of the half bridges 28a, 28b are limited to the regions 31, 32 in the topology according to the invention.
  • the conductor pieces corresponding to the areas 31, 32 can be kept very short.
  • the power converter circuit 20 can therefore be designed with a low structural complexity. If the power converter circuit 20 is constructed in a multilayer board, the conductor pieces that correspond to the Be ⁇ rich 31, 32, for example, in a middle Able to be arranged. Above and / or below these layers can then have other parts of the power converter circuit 20 suitable for shielding or specially provided metallic surfaces.
  • the housing of the power converter circuit 20 can be constructed simplified, for example as a plastic housing as metal ⁇ housing, since the housing must meet fewer or no Schirmungsauf poly instead. FIGS.
  • FIG. 4 to 7 show the sequence of the switching states of the half bridges 26a, 26b of the first circuit 21 and the half bridges 30a, 30b of the second circuit 22 over a period corresponding to a period of the fundamental frequency f G , ie 20 ys at a fundamental frequency of 50 Hz.
  • the half-bridges 26a, 26b are operated according to FIG. 4 and FIG. 5 with a PWM whose frequency is only 4 kHz for better illustration.
  • Figures 4 to 7 show in the horizontal direction a coinciding time axis Z. In the vertical direction is a normalized axis S, which indicates the switching state of the respective half-bridge 26a, 26b, 30a, 30b.
  • the switching state in this case comprises the state of the two power semiconductors T1 ... 8 of the respective half bridge 26a, 26b, 30a, 30b, one of the power semiconductors T1 ... 8 of a half bridge 26a, 26b, 30a, 30b being turned on and the other switched off is
  • the half bridges 26a, 26b of the first circuit 21 always switch in common mode, ie synchronously, and in opposite directions.
  • the resulting voltage difference at the outputs of the half bridges 26a, 26b thus corresponds either to the intermediate circuit voltage UZK or zero (short-circuited outputs).
  • the filter capacitor 29 that is to say from the perspective of the half bridges 26a, 26b behind the filter inductors 28a, 28b, a smoothed voltage characteristic is thereby realized, which corresponds to a rectified sine wave.
  • shaped alternating voltage corresponds, ie a series of positive half-waves. This voltage curve is shown in a standardized form in FIG. FIG.
  • the PWM used is designed in such a way that a sequence of half-waves remains after filtering high frequencies. It therefore differs in the exact course of something of a PWM to produce a complete sinusoidal course.
  • the half bridges 30a, 30b of the second circuit 22 are reversed at the fundamental frequency f G , ie at a comparatively low frequency of, for example, 50 Hz.
  • f G fundamental frequency
  • every second of the positive half waves in the voltage curve of the filter circuit is Condenser 29 folded and thus generates a complete sinus ⁇ course as output voltage.
  • the reversal of the semi ⁇ bridges 30a, 30b also takes place synchronously and the half-bridges 30a, 30b are of course always in opposite phase switches ge ⁇ .
  • the half-bridges 26a, 26b of the first circuit 21 are switched offset to one another. When one of the half bridges 26a, 26b switches over, the other half bridge 26a, 26b does not switch in this operating mode. The switching can be done with any phase shift to each other, in particular with a phase shift of 180 °.
  • the carrier signal for one of the half ⁇ bridge 26a are phase shifted accordingly relative to the carrier signal for the other half-bridge 26b. If the half bridges 26a, 26b are switched offset relative to one another, then half of the intermediate circuit voltage UZK at the output of the half bridges 26a, 26b lies for a part of the time in addition to the voltages zero and the value of the intermediate circuit voltage UZK. Since the half-bridges 26a, 26b alternate alternately but in total as often as in synchronous operation, the frequency of the voltage changes at the output of the half-bridges 26a, 26b is doubled. The effective frequency of the signal reaching the filter circuit 23 is therefore twice as high as in synchronous operation.
  • this allows the components of the filter circuit 23, in particular the filter inductor 29, to be designed for a higher frequency and thus to be reduced in size. Since the components of the filter circuit 23 and just the filter inductance 29 represent particularly large and bulky components, this is of particular advantage.
  • the current ⁇ judge circuit 20 can be operated as a rectifier and / or as an inverter.
  • 9 shows a block diagram of an embodiment of an energy storage system 93 is ge shows ⁇ .
  • the energy storage system 93 has a erfindungsge ⁇ Permitted converter circuit 20 and an energy storage 90.
  • a charging phase 91 is a single-phase AC voltage source 94 via clamping ⁇ AC voltage contacts 25a, 25b to the Energy storage system 93 connected and loads the energy storage 90.
  • the energy storage 90 may be a battery, which is realized for example in lithium-ion technology.
  • the single-phase AC voltage source 94 may, for example, be a generator or a grid connection with an AC voltage of, for example, 50 Hz and 230 V.
  • the power converter circuit 20 is operated as a rectifier.
  • a consumer 95 is connected to the energy storage system 93 via the AC voltage contacts 25a, 25b and draws power from the energy store 90.
  • the consumer 95 can be, for example, an electric motor or a mains connection.
  • FIGS. 10 and 11 show circuit topologies which are further exemplary embodiments of the invention.
  • the filter circuit 1023 in Figure 10 includes a second filter capacitor 29b, which is ge ⁇ connected in series between filter capacitor 29 and the second filter 28b.
  • the potential point between the filter capacitor 29 and the second filter capacitor 29b is electrically connected to the midpoint M of the intermediate circuit.
  • the circuit according to FIG. 11 largely corresponds to the circuit shown in FIG.
  • the filter circuit 1123 in FIG. 11 comprises a third and fourth filter capacitor 29 c, d.
  • the third filter capacitor 29 c is connected between the terminal contact 24 a and the potential point between the first filter inductance 28 a and the filter capacitor 29.
  • the fourth fil- Capacitor 29d is connected between the terminal contact 24b and the potential point between the second filter inductor 28b and the second filter capacitor 29b.

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un circuit convertisseur pour des systèmes monophasés, comprenant-un premier circuit, - un deuxième circuit et - un circuit de filtrage, - le premier circuit présente des contacts de connexion qui sont destinés à être connectés à une tension continue et entre lesquels sont disposés un circuit intermédiaire comprenant un montage en série de deux condensateurs ainsi que deux premiers demi-ponts montés en série, parallèlement au circuit intermédiaire, - le circuit intermédiaire est réalisé sous la forme d'un circuit intermédiaire divisé et sert à générer un centre d'une tension de circuit intermédiaire au point situé entre les condensateurs, - les points de potentiel entre les condensateurs et entre les premiers demi-ponts sont reliés les uns aux autres, - le circuit de filtrage comprend des premières connexions entre lesquelles est disposée une série constituée d'une première inductance de filtrage, d'un condensateur de filtrage et d'une deuxième inductance de filtrage, les premières connexions étant reliées aux centres des deux premiers demi-ponts, - le circuit de filtrage comprend des deuxièmes connexions aux points entre le condensateur de filtrage et la première inductance de filtrage ainsi qu'entre le condensateur de filtrage et la deuxième inductance de filtrage, - le deuxième circuit présente deux deuxièmes demi-ponts parallèles dont les centres forment des sorties de tension alternative, - les points de potentiel extérieurs des deuxièmes demi-ponts sont reliés aux deuxièmes connexions du circuit de filtrage.
PCT/EP2017/081211 2016-12-07 2017-12-01 Convertisseur à haut rendement pour systèmes monophasés WO2018104174A1 (fr)

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Application Number Priority Date Filing Date Title
DE102016224310.1 2016-12-07
DE102016224310.1A DE102016224310A1 (de) 2016-12-07 2016-12-07 Hocheffizienter Stromrichter für einphasige Systeme

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