BRPI1101525A2 - Single-phase DC-AC CONVERTER WITH SERIES VOLTAGE ACTION - Google Patents
Single-phase DC-AC CONVERTER WITH SERIES VOLTAGE ACTION Download PDFInfo
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- BRPI1101525A2 BRPI1101525A2 BRPI1101525A BRPI1101525A2 BR PI1101525 A2 BRPI1101525 A2 BR PI1101525A2 BR PI1101525 A BRPI1101525 A BR PI1101525A BR PI1101525 A2 BRPI1101525 A2 BR PI1101525A2
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
CONVERSOR CC-CA MONOFÁSICO COM AÇÃO DE TENSÃO SÉRIE O conversor monofásico com Ação de Tensão Série (ATS) é empregado para a alimentação de cargas monofásicas com tensão regulada em amplitude e frequência. O circuito do conversor proposto é obtido a partir da conexão dos elementos mostrados na Fig. 2, ou seja, uma fonte primária de energia (1), um barramento capacitivo cc (2), oito chaves de potência (3), um transformador de alta frequência (4), e a carga monofásica (5). A conexão em série (usada para se obter níveis adicionais de tensão na carga) é possível com o arranjo do transformador conectando em série dois conversores ponte H. Com esta conexão em série é possível obter um acréscimo do número de níveis da tensão aplicada à carga. A invenção possui aplicação no setor da eletrônica industrial, podendo ser instalada em um sistema de interface entre uma bateria e uma carga monofásica, ou entre um painel fotovoltaico e a rede elétrica.SINGLE-VOLTAGE AC-CONVERTER WITH SERIAL VOLTAGE ACTION The single-phase converter with Series Voltage Action (ATS) is used to supply single-phase loads with voltage regulated in amplitude and frequency. The proposed converter circuit is obtained from the connection of the elements shown in Fig. 2, that is, a primary power source (1), a capacitive dc bus (2), eight power switches (3), a power transformer high frequency (4), and single-phase load (5). The series connection (used to obtain additional voltage levels in the load) is possible with the transformer arrangement by connecting two H bridge converters in series. With this series connection it is possible to obtain an increase in the number of voltage levels applied to the load. . The invention has application in the industrial electronics sector, and can be installed in an interface system between a battery and a single-phase load, or between a photovoltaic panel and the electrical network.
Description
RELATORIO DESCRITIVO Pedido de patente de invenção para "CONVERSOR CC-CA MONOFÁSICO COM AÇÃO DE TENSÃO SÉRIE"DESCRIPTION REPORT Patent Application for "SERIES VOLTAGE ACTION SINGLE-AC DC-AC CONVERTER"
O conversor monofásico com Ação de Tensão Série (ATS) é empregado para a alimentação de cargas monofásicas com tensão regulada. O conversor proposto é apresentado na Fig. 1.The single-phase voltage action series converter (ATS) is used for supplying single-phase voltage regulated loads. The proposed converter is presented in Fig. 1.
Este circuito é obtido a partir da conexão dos elementos mostrados na Fig. 2, ou seja, uma fonte primária de energia (1), um barramento capacitivo cc (2), oito chaves de potência (3), um transformador de alta freqüência (4), e a carga monofásica (5). A conexão em série (usada para se obter níveis adicionais de tensão na carga) é possível com o arranjo do transformador conectando em série dois conversores.This circuit is obtained from the connection of the elements shown in Fig. 2, ie a primary power source (1), a capacitive dc bus (2), eight power switches (3), a high frequency transformer ( 4), and the single phase load (5). Serial connection (used for additional load voltage levels) is possible with the transformer arrangement by serially connecting two converters.
O conversor ATS apresenta uma série de vantagens frente às topologias convencionais; logo, suas características inovadoras são: (i) tensão de saída maior do que a tensão do elo cc; e (ii) menor distorção harmônica da tensão aplicada à carga monofásica. Estas duas características inovadoras são garantidas pelos níveis adicionais de tensão processada pelo conversor proposto.The ATS converter has a number of advantages over conventional topologies; therefore, its innovative features are: (i) output voltage greater than dc link voltage; and (ii) lower harmonic distortion of the voltage applied to the single phase load. These two innovative features are guaranteed by the additional voltage levels processed by the proposed converter.
O circuito equivalente do Inversor Monofásico ATS éThe equivalent circuit of the ATS Single Phase Inverter is
mostrado na Fig. 3(a), onde V14 = V10 - V40 e Vi é a tensão no secundário do transformador. A relação de transformação do transformador de alta freqüência é dada por η, o que significa que Vs = ηνρ, onde vp é a tensão do primário do transformador. Assim, a tensão aplicada na carga pode ser escrita da seguinte forma:shown in Fig. 3 (a), where V14 = V10 - V40 and Vi is the secondary voltage of the transformer. The transformation ratio of the high frequency transformer is given by η, which means that Vs = ηνρ, where vp is the transformer primary voltage. Thus, the voltage applied to the load can be written as follows:
Vi — V14 — Vs (I)Vi - V14 - Vs (I)
Vl = Vw - V40 - η(ν20 - V30) (II) A equação (II) mostra que a tensão da carga (vi) é função das tensões processadas pelas oito chaves, bem como função de η. Esta característica única observada neste conversor será explorada para melhorar a distorção harmônica da tensão aplicada à carga e para aprimorar o aproveitamento da tensão do barramento cc.Vl = Vw - V40 - η (ν20 - V30) (II) Equation (II) shows that the load voltage (vi) is a function of the voltages processed by the eight keys, as well as a function of η. This unique feature observed in this converter will be explored to improve the harmonic distortion of the voltage applied to the load and to improve the utilization of the dc bus voltage.
Outro aspecto importante no conversor proposto é a fase entre as tensões V14 e vs, como observado na Fig. 3(b). A defasagem entre as tensões é denominada ângulo δ e também será utilizada para melhorar a distorção harmônica da tensão aplicada na carga.Another important aspect in the proposed converter is the phase between voltages V14 and vs, as observed in Fig. 3 (b). The lag between the stresses is called angle δ and will also be used to improve the harmonic distortion of the voltage applied to the load.
É mostrada na Fig. 4 a THD (.Distorção Harmônica Total) daShown in Fig. 4 is the THD (Total Harmonic Distortion) of the
tensão aplicada na carga em função do ângulo δ. Pode-se perceber neste resultado que existe um ponto de THD mínimo, ou seja, δ = 135° e δ = 225°. Este comportamento da THD em função do ângulo δ pode ser explicado a partir das formas de onda da tensão v, mostradas na mesma figura para os ângulos J = 45°, 180°, 225° e 330° (ver Fig. 4). A melhor distribuição dos pulsos se dá em δ = 135° e δ = 225°.voltage applied to the load as a function of angle δ. It can be seen from this result that there is a minimum THD point, ie δ = 135 ° and δ = 225 °. This behavior of THD as a function of angle δ can be explained from the voltage waveforms v, shown in the same figure for angles J = 45 °, 180 °, 225 ° and 330 ° (see Fig. 4). The best pulse distribution is at δ = 135 ° and δ = 225 °.
Outro resultado importante se refere à tensão do barramento cc. É mostrada na Tabela 1 a tensão do barramento cc em função da relação de transformação η considerando a tensão na carga igual a 1 pu. Nota-se a partir dessa tabela que a tensão do barramento cc será sempre menor do que no conversor convencional.Another important result refers to the dc bus voltage. Table 1 shows the dc bus voltage as a function of the transformation ratio η considering the load voltage equal to 1 pu. Note from this table that the dc bus voltage will always be lower than in the conventional converter.
Tabela 1 - Tensão do barramentò cc considerando Vt = IpuTable 1 - Busbar voltage cc considering Vt = Ipu
η = 1 η = 2 η = 3 VdC 0,50 0,33 0,25η = 1 η = 2 η = 3 VdC 0.50 0.33 0.25
Considerando a tensão na carga de referência dada por v* - mVdc cos(Wt), onde m é o índice de modulação, pode-se escrever as V20 4ηConsidering the voltage at the reference load given by v * - mVdc cos (Wt), where m is the modulation index, one can write V20 4η
tensões PWM {Modulação por Largura de Pulso - MLP) da seguinte forma:PWM (Pulse Width Modulation - MLP) voltages as follows:
v* =ü£^COs(wt) (III)v * = ü £ ^ COs (wt) (III)
44
-^cos (wt + £) (IV)- cos (wt + £) (IV)
4η4η
= mVdccosçwt + ^ (V)= mVdccosçwt + ^ (V)
JU 477JU 477
=-Z^cos (wt) (VI)= -Z ^ cos (wt) (VI)
44
O diagrama de controle do Inversor Monofásico ATS é mostrado na Fig. 5.The control diagram of the ATS Single Phase Inverter is shown in Fig. 5.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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BRPI1101525 BRPI1101525A2 (en) | 2011-04-20 | 2011-04-20 | Single-phase DC-AC CONVERTER WITH SERIES VOLTAGE ACTION |
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BRPI1101525 BRPI1101525A2 (en) | 2011-04-20 | 2011-04-20 | Single-phase DC-AC CONVERTER WITH SERIES VOLTAGE ACTION |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108631316A (en) * | 2017-03-15 | 2018-10-09 | 艾思玛铁路技术有限公司 | The method and device of the frequency of output voltage for regulating and controlling power supply unit |
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2011
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108631316A (en) * | 2017-03-15 | 2018-10-09 | 艾思玛铁路技术有限公司 | The method and device of the frequency of output voltage for regulating and controlling power supply unit |
CN108631316B (en) * | 2017-03-15 | 2023-08-01 | 艾思玛铁路技术有限公司 | Method for controlling the frequency of an output voltage of a power supply device and power supply device |
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