CN111669062B - 一种提升能量路由器轻载及空载效率的系统运行方法 - Google Patents

一种提升能量路由器轻载及空载效率的系统运行方法 Download PDF

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CN111669062B
CN111669062B CN202010204379.3A CN202010204379A CN111669062B CN 111669062 B CN111669062 B CN 111669062B CN 202010204379 A CN202010204379 A CN 202010204379A CN 111669062 B CN111669062 B CN 111669062B
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纪华丽
徐鹏飞
李健勋
李鸿儒
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Qingdao Topscomm Communication Co Ltd
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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/48—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by combination of static with dynamic converters; by combination of dynamo-electric with other dynamic or static converters
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or 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
    • H02M7/219—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
    • 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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

本发明公开了一种提升能量路由器轻载及空载效率的系统运行方法，属于电力电子变压器控制技术领域。其技术方案包括根据电网不平衡度要求和额定电流计算可允许的两相运行功率限定值Pmax。实时检测系统功率p并读取上两次两相运行的非运行相x，当系统运行功率低于限定值P2时，断开某一相断路器，切换至两相运行控制算法，进入两相运行，此时只有两相模组参与运行，有效降低损耗；当系统运行功率高于限定值P1时，闭合该相断路器，切入三相运行控制算法，进入三相运行模式。其中为了系统稳定运行，采用滞环运行方法，即P1>P2。本发明应用于PET高效运行方面，具有降低PET在轻载及空载的损耗，提升系统运行效率优势。

Description

一种提升能量路由器轻载及空载效率的系统运行方法
技术领域
本发明涉及电力电子变压器控制技术领域，尤其涉及一种提升能量路由器轻载及空载效率的系统运行方法。
背景技术
一种提升能量路由器轻载及空载效率的系统运行方法主要应用于新型的电力电子变压器控制方案。相比传统电力变压器，电力电子变压器(PET)不仅能实现电压等级变换、电气隔离和能量传递等功能，还能实现潮流控制、电能质量控制等额外功能。三相PET处于空载待机或轻载下，由于需要模块分压，三相所有模组均处于运行状态，而此时每个模组都未运行在满功率状态下，增加了系统损耗，不利于提升系统运行效率。
传统的提升PET运行效率的方法包括降低开关频率，改善控制方法，降低高频隔离变压器损耗，这些方法均能一定程度提升效率，但无法大幅提高，且实现麻烦，研发周期较长。
发明内容
本发明针对上述缺陷及需求，提供了一种提升能量路由器轻载及空载效率的系统运行方法，该方法在系统轻载及空载时切入到两相运行，满足系统正常运行的同时有效提升系统的运行效率。
为了实现上述目的，本发明提供了如下技术方案：
该种提升PET轻载及空载效率的系统运行方法，包含以下步骤：
步骤1、根据电网允许的不平衡度及额定功率计算两相运行允许的最高功率Pmax，考虑一定的裕量选择滞环控制的功率值上限P1和功率值下限P2；
Pmax取根据不平衡度允许功率Pa和额定电流允许功率Pb较小值，P1和P2要小于Pmax，且P1>P2。其中Pa和Pb计算方式如下:
Pa取决于变压器短路容量S和不平衡度允许值ε计算得到，计算公式为：
Pa＝S·ε；
Pb取决于PET设备的额定功率P,计算公式为：
Figure GDA0003641758100000021
步骤2、实时监测系统运行功率p并读取上两次两相运行的非运行相x1，x2；
p为视在功率。记录上两次的非运行相目的为防止三相运行时间不一致导致功率器件老化不一致，影响其他性能。
步骤3、运行功率p<P2，且当前运行状态为三相运行时，此状态持续一段时间后，断开除x1和x2的另外一相，控制器切入到两相运行算法，稳定运行后执行步骤2；
系统初次运行时首先进入两相运行状态，且断开相随机选择，第二次进入两相运行时随机选择其他两相中的一相断开。
步骤4、当运行功率p>P1,且当前运行状态为两相运行时，此状态持续一段时间后，闭合断开相的断路器开关，控制器切入到三相运行算法，稳定运行后执行步骤2；
与现有技术相比，本发明的优点和积极效果在于：减少三相PET在空载及轻载下处于工作状态的模块数，显著提升PET运行效率，延长PET模组使用寿命。
附图说明
图1是本发明实施例的电力电子变压器结构图；
图2是本发明实施例的电力电子变压器电路拓扑图；
图3是本发明实施例的流程框图。
具体实施方式
以下，结合附图对本发明的具体实施方式进行进一步的描述。
本发明应用的PET结构如图1所示，其为三级结构。输入级为AC/DC变换器，将10kV交流电转换为高压直流电；中间隔离级为带高频隔离变压器的DC/DC变换器，其承担电气隔离的作用，将高压直流电转换为低压直流电；输出级为DC/AC变换器，其将直流电变换为380V交流电。
具体拓扑结构如图2所示，输入级采用CHB拓扑，中间隔离级采用SRC-DAB拓扑，DC/AC级采用H桥拓扑，其相比于传统的PET多了三个单相可控断路器，用于断开/闭合某一相使系统在两相与三相之间切换。图3为具体实施方式，参照图3，本发明提升PET轻载及空载效率的系统运行方法实施过程如下：
1、根据电网允许的不平衡度及额定功率计算两相运行允许的最高功率Pmax，考虑一定的裕量选择滞环控制的上限功率值P1和下限功率值P2；
Pmax取根据不平衡度允许功率Pa和额定电流允许功率Pb较小值，P1和P2要小于Pmax，且P1>P2。其中Pa和Pb计算方式见发明内容:
2、实时监测系统运行功率p并读取上两次两相运行的非运行相x1，x2；
p为视在功率。记录上两次的非运行相的目的为防止三相运行时间不一致导致功率器件老化不一致，影响其他性能。
3、运行功率p<P2，且当前运行状态为三相运行时，此状态持续一段时间后，断开除x1和x2的另外一相，控制器切入到两相运行算法，稳定运行后执行步骤2；
系统初次运行时首先进入两相运行状态，且断开相随机选择，第二次进入两相运行时随机选择其他两相中的一相断开。
4、当运行功率p>P1,且当前运行状态为两相运行时，此状态持续一段时间后，闭合断开相的断路器开关，控制器切入到三相运行算法，稳定运行后执行步骤2。
以上所述仅为本发明的实施例，并不用以限制本发明的范围，凡在本发明说明书及附图内容的范围内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (4)

1.一种提升能量路由器轻载及空载效率的系统运行方法，其特征在于，所述方法包括如下步骤：
步骤1：根据电网允许的不平衡度及额定电流计算两相运行允许的最高功率Pmax，考虑一定的裕量选择滞环控制的功率值上限P1和功率值下限P2；
步骤2：实时监测系统运行功率p并读取上两次两相运行的非运行相x1，x2；
步骤3：当运行功率p<P2，且当前运行状态为三相运行时，此状态持续一段时间后，断开除x1和x2的另外一相，控制器切入到两相运行算法，稳定运行后执行步骤2；
步骤4：当运行功率p>P1,且当前运行状态为两相运行时，此状态持续一段时间后，闭合断开相的断路器开关，控制器切入到三相运行算法，稳定运行后执行步骤2。
2.如权利要求1所述的一种提升能量路由器轻载及空载效率的系统运行方法，其特征在于，所述步骤1中，Pmax取根据不平衡度允许功率Pa和额定电流允许功率Pb较小值，P1和P2要小于Pmax，且P1>P2，其中Pa和Pb计算方式如下:
Pa取决于变压器短路容量S和不平衡度允许值ε计算得到，计算公式为：
Pa＝S·ε；
Pb取决于PET设备的额定功率P,计算公式为：
Figure FDA0003641758090000011
3.如权利要求1所述的一种提升能量路由器轻载及空载效率的系统运行方法，其特征在于，所述步骤2中p为视在功率，记录上两次的非运行相用于防止三相运行时间不一致导致功率器件老化不一致，影响其他性能。
4.如权利要求1所述的一种提升能量路由器轻载及空载效率的系统运行方法，其特征在于，所述步骤3中，系统初次运行时首先进入两相运行状态，且断开相随机选择，第二次进入两相运行时随机选择其他两相中的一相断开。
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