CN114556759A - 电源装置 - Google Patents

电源装置 Download PDF

Info

Publication number
CN114556759A
CN114556759A CN202080073323.7A CN202080073323A CN114556759A CN 114556759 A CN114556759 A CN 114556759A CN 202080073323 A CN202080073323 A CN 202080073323A CN 114556759 A CN114556759 A CN 114556759A
Authority
CN
China
Prior art keywords
load
power
unit power
supply device
power supply
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202080073323.7A
Other languages
English (en)
Inventor
顾明磊
叶田玲彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of CN114556759A publication Critical patent/CN114556759A/zh
Pending legal-status Critical Current

Links

Images

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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/0074—Plural converter units whose inputs are connected in series
    • 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
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • H02M7/145—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 thyratron or thyristor type requiring extinguishing means
    • H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/162—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only 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
    • 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
    • H02M7/219—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 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • 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
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

提供即使在各单位电力变换器的负载不同的情况下也能够将单位电力变换器的输出电压控制为大致固定的电源装置。一种电源装置，多个单位电力变换器串联连接到交流***并且从单位电力变换器向负载装置进行电力供给，其特征在于，所述电源装置具备控制装置，所述控制装置求出多个负载装置中的负载电力的负载不平衡度，在负载不平衡度变大的情况下对单位电力变换器的交流***侧电压进行控制，以使得降低交流***中的功率因数来运用。

Description

电源装置
技术领域
本发明涉及多个单位电力变换器串联连接到交流***并且从各单位电力变换器向各负载装置进行电力供给的电源装置，特别涉及在负载装置不同的情况下能够稳定地控制单位电力变换器的输出电压的电源装置。
背景技术
近年来，伴随着可再生能源、EV的增加、蓄电池价格的下降，能源管理不断提高。
与此相伴，要求以快速EV充电器为首的具有能够灵活地控制面向大楼的电力流的功能的电源装置。
作为这样的电源装置的一例，已知有非专利文献1。根据非专利文献1，多个单位电力变换器串联连接到交流***，从各单位电力变换器向各负载装置进行电力供给。根据这样的结构，为了电源装置的小型轻量化，不使用商用变压器就能够从高压交流直接输出低压直流电力。在该情况下，串联连接多个低耐压的单位电力变换器（AC/DC变换器），对高压进行分压。
现有技术文献
非专利文献
非专利文献1：M.Moosavi、G.Farivar、H.Iman-Eini and S.M.Shekarabi，“Avoltage balancing strategy with extended operating region for cascaded H-bridge converters，”in IEEE Transactions on Power Electronics，vol.29，no.9，pp.5044-5053，2014年9月。
发明内容
发明要解决的课题
在可再生能源发电设备的引入、蓄电设备的利用、各种电气负载的增加这样的背景下，如上述的现有技术那样，在多个串联连接的整流器（单位电力变换器）的负载不同且不平衡的情况下，难以稳定地控制整流器的输出电压。
然而，在各单位电力变换器的输出不平衡时，各单位电力变换器的直流电压也与输出成比例地不平衡，发生过电压。因此，需要使多个单位电力变换器的直流电压稳定化的控制技术。
根据以上的内容，本发明的目的在于，解决所述的课题，提供一种即使在各单位电力变换器的负载不同的情况下也能够将单位电力变换器的输出电压控制为大致固定的电源装置。
用于解决课题的方案
一种电源装置，多个单位电力变换器串联连接到交流***并且从单位电力变换器向负载装置进行电力供给，其特征在于，所述电源装置具备控制装置，所述控制装置求出多个负载装置中的负载电力的负载不平衡度，在负载不平衡度变大的情况下对单位电力变换器的交流***侧电压进行控制，以使得降低交流***中的功率因数来运用。
发明效果
根据本发明，例如，在切换快速EV充电器中的输出端口那样的负载变为不平衡的过渡时，电源装置中的各DC负载变为不平衡的过渡时，能够稳定地控制各单位电力变换器的输出电压。
附图说明
图1是示出本发明的实施例1的电源装置的结构例的图。
图2是示出单位电力变换器PC的具体的电路结构例的图。
图3是示出电源装置的控制装置中的处理内容的图。
图4是示出采用本发明时的各部波形的图。
图5是示出不采用本发明时的各部波形的图。
图6是示出本发明的实施例2的电源装置的结构例的图。
图7是示出本发明的实施例3的电源装置的结构例的图。
具体实施方式
以下，参照附图来详细地说明本发明的实施例。
实施例1
图1是示出本发明的实施例1的电源装置的结构例的图。根据图1的上部所示的电源装置主电路结构，多个单位电力变换器PC（在图示的例子中为PC1至PC4的4台结构）的交流侧端子被串联连接，经由电抗器101连接到交流电源100。此外，负载Ld1、Ld2、Ld3、Ld4分别连接到各单位电力变换器PC1、PC2、PC3、PC4的直流端子侧。此外，与负载Ld1、Ld2、Ld3、Ld4并联地设置有电容器C（C1至C4）。这种情况下的负载例如是快速EV充电器，设为其一部分为运行中但其他部分为停止中、或者即使为运行中负载的大小也不同这样的多种负载状态下的运用。
在图1的上部，Vs是交流电源100的端子电压，iL是电流，Vac1至Vac4是单位电力变换器PC1至PC4的交流端子侧电压，Vdc1至Vdc4是单位电力变换器PC1至PC4的直流端子侧电压，P1至P4分别表示负载Ld1至Ld4的负载电力。
图1的下部所示的电源装置的控制装置200将交流电源100的端子电压Vs、电流iL、单位电力变换器PC1至PC4的直流端子侧电压Vdc1至Vdc4、负载电力P1至P4作为输入，为了使单位电力变换器PC1至PC4的交流端子侧电压Vac1至Vac4变为规定电压而实施单位电力变换器PC1至PC4的PWM（Pulse Width Modulation：脉宽调制）控制。
再有，单位电力变换器PC是在交流和直流之间进行电力变换的所谓的AC/DC变换器，但在图1的电源装置的通常的使用状态下作为将交流变换为直流的整流器而发挥作用。此外，作为单位电力变换器PC的具体的电路结构，能够采用各种结构，例如如在图2中例示的那样，串联连接两组半导体开关电路SW来构成支路，并联连接两组支路，将支路的两端作为直流输出端子。而且，能够采用将各支路的串联连接的两组半导体开关电路SW的连接点之间分别连接到单相交流的各交流端子的结构。在本发明中，只要能够实现AC/DC变换器即可，其实现电路结构是怎样的结构都可以。
图3是示出电源装置的控制装置200中的处理内容的图，由此使多个单位电力变换器的直流电压稳定化。电源装置的控制装置200一般由CPU（Central Processing Unit，中央处理器）实现的情况较多，因此，在此，意图说明CPU中的处理内容。
图3的处理步骤S1和S2是外部输入的导入处理，在处理步骤S1中，感测并输入单位电力变换器PC1至PC4的直流端子侧电压Vdc1至Vdc4。在处理步骤S2中，感测并输入负载Ld1至Ld4的负载电力P1至P4。再有，在对这些多个输入不特别地进行区别的情况下，有时一般简称为Vdcn、Pn。
图3的处理步骤S3和S4进行负载不平衡度计算处理。关于在此进行的负载不平衡度，考虑意味着负载不平衡度的指标的计算式为多个的情况，但在此说明其一例。在此，作为其一例，在处理步骤S3中，从多个负载电力Pn（P1至P4）之中选定成为最大值的负载。将其设为Pmax。
接下来，在处理步骤S4中，求出Pmax和Pn的差ΔPn。因此，在作为负载电力而感测到四组的图1的例子的情况下，形成4个ΔPn，其中的一个为零。进而，在处理步骤S4中，利用（1）式来计算负载不平衡度。这是将各负载差ΔPn除以最大负载Pmax并将其总和ΣΔPn/Pmax定义为负载不平衡度。再有，除此以外还存在几个示出负载的不平衡度的指标。这些是用平均值求出、设为平方和等。
[数式1]
负载不平衡度
Figure 71636DEST_PATH_IMAGE001
在此，可知，如从（1）式显而易见的那样，作为平衡状态，例如在所有的负载电力Pn（P1至P4）为相同的值的情况下（例如全部为100%），负载不平衡度为“0”，但当负载电力变为不平衡时，示出有意义的数值，不平衡的程度越大，则示出越大的数值。关于所述的（1）式以外的示出负载的不平衡度的指标，如果示出这种倾向，就能采用。
处理步骤S5是将负载不平衡度变换为功率因数的处理。在这种情况下，预先适当地设定负载不平衡度的极限值limit。在此，在极限值limit以下的负载不平衡度的状态（包括稳定状态）下，使功率因数cosφ为1，在极限值limit以上的负载不平衡度的状态下，负载不平衡度越大，则越降低功率因数cosφ。
也就是说，在极限值limit以下的负载不平衡度的状态下，使交流电源100的端子电压Vs和电流iL为同相，但在极限值limit以上的负载不平衡度的状态下，使电流iL相对于电压Vs为延迟相位，并且使延迟相位的程度根据负载不平衡度的大小而增大。
处理步骤S6、S7涉及功率因数控制处理。首先，在处理步骤S6中，为了调节功率因数cosφ而针对单位电力变换器PC1至PC4设定充放电模式。在作为通常状态，负载不平衡度为电源装置的固有极限值limit以下的情况下，利用作为以往的控制法的功率因数cosφ=1对电源装置进行控制，但当超过电源装置的固有极限值limit时，降低功率因数cosφ，由此，使线电流iL的有效值增加，使充放电模式的充放电电流变大。
在此，充电模式是如下的模式：在线电流iL为正（或负）时，在单位电力变换器PC的交流侧产生+Vdc（或-Vdc），与此同时，线电流iL流入到电容器C（C1至C4），电容器电压增加。另一方面，放电模式是如下的模式：在线电流iL为正（或负）时，在交流侧产生-Vdc（或+Vdc），与此同时，线电流iL向电容器流出，电容器电压减小。
当充放电模式的充放电电流变大时，能够强化对电容器C（C1至C4）进行充放电的能力，使作为输出电压的电容器电压的控制响应加速，即使在负载不平衡时也能够稳定地控制整流器输出电压。
在处理步骤S7中，针对单位电力变换器PC1至PC4，按照在处理步骤S6中设定的充放电模式，决定单位电力变换器PC1至PC4的交流端子侧电压Vac1至Vac4，以成为该电压的方式来实施单位电力变换器PC1至PC4的PWM（Pulse Width Modulation：脉宽调制）控制。
图4示出了采用本发明时的各部波形。在该图中从上部起示出了交流电源100的端子电压Vs、电流iL、负载电力P1至P4、（1）式的不平衡度ΣΔPn/Pmax、功率因数cosφ、直流端子侧电压Vdc1至Vdc4的时间序列变化。
根据该原理波形，在图4中的时刻t之前，各负载P1至P4相同，负载不平衡度ΣΔPn/Pmax为零，功率因数cosφ为1，输入电压vs、线电流iL为相同的相位。在时刻t之后，各负载P1至P4变为不平衡，负载不平衡度ΣΔPn/Pmax大，因此，降低功率因数cosφ，在线电流iL中产生相对于输入电压vs的相位，使线电流iL的有效值增加，由此，强化电容器的充放电能力，即使在负载不平衡时也能够稳定地控制整流器输出电压。在图4中记述了此后通过负载不平衡度ΣΔPn/Pmax的消除而恢复到时刻t以前的状态的情况。
根据本发明的控制，在负载不平衡度降低的状态下，将各整流器输出电压Vdc控制为同一值。
再有，在作为参考而不应用本发明的情况下，如图5那样。在时刻t变为不平衡之前的状态与图4相同。在时刻t以后，各负载P1至P4变为不平衡，但功率因数没有被调整。在该情况下，不能稳定地控制直流端子侧电压Vdc1至Vdc4。负载越大，电压越低，负载越轻，电压越高。当负载P为P1>P2>P3>P4时，直流端子侧电压Vdc为Vdc4>Vdc3>Vdc2>Vdc1。再有，如果负载不平衡度ΣΔPn/Pmax被消除，则恢复到时刻t以前的状态。
实施例2
在实施例2中，使用图6，对可采用本发明的电源装置中的单位电力变换器的其他的结构例进行说明。
图6的单位电力变换器PC（PC1至PC4）从交流输入侧起依次配置交流-直流变换器（整流器）REC1、并联电容器、直流-交流变换器INV、变压器Tr、交流-直流变换器REC2（整流器）、并联电容器C而构成。此外，其中，由直流-交流变换器INV、变压器Tr、交流-直流变换器REC2构成的部分构成了绝缘型直流-直流变换器。再有，控制装置200的结构可以与实施例1相同。
根据图6，作成为在负载部中在整流器REC1和负载Ld之间***了绝缘型直流-直流变换器的结构，当利用其输出对EV充电时，能够构成EV充电器。在此，将整流器REC1和绝缘型直流-直流变换器的套组称为单元。
根据上述结构、使用法，在对各EV充电器进行充电时，充电电力当然不同。例如即使一个单元的负载为零，负载不平衡度变高，也能够使用本发明的控制法来稳定地控制整流器REC1的输出电压Vdc。
实施例3
在实施例3中，使用图7来说明使用了实施例2的单位电力变换器的进一步的变形结构例。
实施例3的单位电力变换器PC（单元）的结构与实施例2相同，但单位电力变换器PC（单元）的电源侧接线以及负载侧接线不同于实施例2。
如在图7的中部示出了接线关系那样，在交流电源侧设置有设置点GND，对单元PC1施加正电位，此外，对单元PC3施加负电位，进行直流变换。此外，在负载侧，利用奇数号码的多个单元输出对负载P1进行并联供电，利用偶数号码的多个单元输出对负载P2进行并联供电，从而构成电源装置。再有，控制装置200的结构可以与实施例1、实施例2相同。
根据该结构，在单元PC1和单元PC2中负载不同的情况下，即使负载不平衡度变高，也能够使用本发明的控制法稳定地控制整流器的输出电压。
在负载不平衡度进一步变高的情况下，使蓄电***工作，作为配电***的平衡器，能够消除负载P1和负载P2的差。
附图标记的说明
PC1、PC2、PC3、PC4：单位电力变换器（单元）；Ld1、Ld2、Ld3、Ld4：负载；100：交流电源；101：电抗器；200：控制装置。

Claims (7)

1.一种电源装置，多个单位电力变换器串联连接到交流***并且从单位电力变换器向负载装置进行电力供给，其特征在于，
所述电源装置具备控制装置，所述控制装置求出多个负载装置中的负载电力的负载不平衡度，在所述负载不平衡度变大的情况下对所述单位电力变换器的交流***侧电压进行控制，以使得降低所述交流***中的功率因数来运用。
2.根据权利要求1所述的电源装置，其特征在于，
所述控制装置在所述负载不平衡度小于限制值的情况下，使所述功率因数为1.0，在所述负载不平衡度大于限制值的情况下，降低所述功率因数。
3.根据权利要求2所述的电源装置，其特征在于，
所述控制装置在降低所述交流***中的功率因数来运用时，将多个单位电力变换器的直流电压控制为同一值。
4.根据权利要求3所述的电源装置，其特征在于，
所述单位电力变换器串联连接两组半导体开关电路而构成支路，将两组支路并联连接而将支路的两端作为直流输出端子，将各支路的串联连接的两组半导体开关电路的连接点之间分别连接到单相交流的各交流端子。
5.根据权利要求3所述的电源装置，其特征在于，
所述单位电力变换器从交流输入侧起依次配置交流-直流变换器、并联电容器、直流-交流变换器、变压器、交流-直流变换器而构成。
6.根据权利要求3所述的电源装置，其特征在于，
所述单位电力变换器由第一单位电力变换器和第二单位电力变换器构成，构成为对第一负载进行并联供电，在所述交流***侧设置有设置点，对第一单位电力变换器施加正电位，对第二单位电力变换器施加负电位，
利用多个所述单位电力变换器向多个负载供电，并且，
构成多个所述单位电力变换器的多个第一单位电力变换器和多个第二单位电力变换器串联连接到所述交流***。
7.根据权利要求6所述的电源装置，其特征在于，
所述负载不平衡度通过将多个负载电力的最大值作为分母并且将最大值与各负载电力之差的和作为分子的运算来求出。
CN202080073323.7A 2019-10-21 2020-08-17 电源装置 Pending CN114556759A (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2019-191826 2019-10-21
JP2019191826A JP7252878B2 (ja) 2019-10-21 2019-10-21 電源装置
PCT/JP2020/030947 WO2021079593A1 (ja) 2019-10-21 2020-08-17 電源装置

Publications (1)

Publication Number Publication Date
CN114556759A true CN114556759A (zh) 2022-05-27

Family

ID=75620455

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202080073323.7A Pending CN114556759A (zh) 2019-10-21 2020-08-17 电源装置

Country Status (5)

Country Link
US (1) US20240055973A1 (zh)
EP (1) EP4050784A4 (zh)
JP (1) JP7252878B2 (zh)
CN (1) CN114556759A (zh)
WO (1) WO2021079593A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022185478A (ja) * 2021-06-02 2022-12-14 株式会社日立製作所 電力変換装置、電力変換システム、および、電力変換装置の制御方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6775160B2 (en) * 2002-09-27 2004-08-10 The Aerospace Corporation Dynamic DC source and load energy recycling power system
JP6559106B2 (ja) * 2016-09-02 2019-08-14 東芝三菱電機産業システム株式会社 電力変換システム
JP2018046601A (ja) * 2016-09-12 2018-03-22 新電元工業株式会社 力率改善コンバータの制御装置
WO2019071331A1 (en) * 2017-10-13 2019-04-18 Ossiaco Inc. BATTERY CHARGER FOR ELECTRIC VEHICLE

Also Published As

Publication number Publication date
US20240055973A1 (en) 2024-02-15
JP7252878B2 (ja) 2023-04-05
WO2021079593A1 (ja) 2021-04-29
JP2021069168A (ja) 2021-04-30
EP4050784A4 (en) 2023-11-15
EP4050784A1 (en) 2022-08-31

Similar Documents

Publication Publication Date Title
EP2833531B1 (en) Bi-directional battery converter and balancer for an electric energy storage of a power supply system
CN106549486B (zh) 用于操作不间断电源的***和方法
EP4080722B1 (en) Energy storage system, balancing control method for energy storage system, and photovoltaic power system
WO2017072991A1 (ja) 電力変換システム及び制御装置
KR20130099022A (ko) 에너지 저장 시스템용 전력 변환 시스템 및 이의 제어방법
CN103023351A (zh) 电动汽车充放储一体化电站功率流动三级变流装置
CN105337335B (zh) 针对多个电池匹配放电结束的***和方法
JP7228949B2 (ja) 電力変換装置
JP2010178495A (ja) 電力変換装置、及び電力変換システム
Irmak et al. A modified droop control method for PV systems in island mode DC microgrid
Tariq et al. A Lithium-ion battery energy storage system using a bidirectional isolated DC-DC converter with current mode control for More Electric Aircraft
CN108207118B (zh) 电力变换装置及其控制方法
CN114556759A (zh) 电源装置
Ahmadi et al. Mitigation of voltage unbalances in bipolar DC microgrids using three-port multidirectional DC-DC converters
CN115362610A (zh) 具有多个lvdc输出的sst***
CN109804520B (zh) 电力转换***、电力供给***及电力转换装置
KR20200017947A (ko) Dc-dc 컨버터 기능을 포함하는 전압 밸런서
EP3985821A1 (en) Power grid
CN113497562A (zh) 功率转换装置及其控制方法
Maneiro et al. A flexible modular multi-level converter for DC microgrids with EV charging stations
Hamidi et al. Design and implementation of a DC line-interactive uninterruptible power supply (UPS) with load leveling
JP7523193B2 (ja) 自立系統向け電源システム
US20240128764A1 (en) Power supply system for independent system
AU2019423646A1 (en) Power supply system and method for controlling power supply system
CN104967352B (zh) 一种储能变流器及其均衡控制方法

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination