WO2017128579A1 - 一种逆变输出过流保护方法 - Google Patents

一种逆变输出过流保护方法 Download PDF

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WO2017128579A1
WO2017128579A1 PCT/CN2016/084305 CN2016084305W WO2017128579A1 WO 2017128579 A1 WO2017128579 A1 WO 2017128579A1 CN 2016084305 W CN2016084305 W CN 2016084305W WO 2017128579 A1 WO2017128579 A1 WO 2017128579A1
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current
output
inverter
loop
inverter system
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PCT/CN2016/084305
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French (fr)
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王定富
曾奕彰
钟伟龙
石学雷
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漳州科华技术有限责任公司
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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
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • 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

Definitions

  • the present invention relates to the field of power electronic control, and in particular to an inverter output overcurrent protection method.
  • voltage-type voltages provide stable voltages.
  • off-grid inverter systems are usually voltage-type power supplies; current-type power supplies usually provide stable currents.
  • grid-connected inverters are usually current-type power supplies.
  • the inverter control method must enable the inverter to provide high-quality, high-stability AC output for the load under any load conditions.
  • the off-grid inverter is a voltage type power supply
  • the output load of the inverter causes an overcurrent
  • the load exceeds the supply power limit of the system, which usually causes a voltage drop
  • the voltage type power supply achieves the goal of voltage regulation.
  • the closed-loop feedback system will continue to increase the duty cycle of the inverter drive until the limit value is reached. At this time, it is possible that the switching tube of the inverter is in the high-frequency current limiting state. At this time, the inverter has a large loss of the switching tube and a large current stress. If it is in this working state for a long time, the reliability and stability of the inverter are lowered.
  • the present invention provides an inverter output overcurrent protection method, and the method adopts the following technical solutions:
  • An inverter output overcurrent protection method comprising the following steps: Step 1: detecting an output current value I out and an output voltage value U out of the inverter system in real time; Step 2: determining whether the output current value I out is greater than Pre-set current threshold I max , if the output current value I out is less than the current threshold I max , then control the inverter system is in the voltage source working state, otherwise proceeds to step 3;
  • Step 3 When the inverter system detects that the output current value I out is greater than or equal to the preset current threshold I max , the inverter system is controlled to be in the current source working state; Step 4: when the control inverter system is in the current source working state, Continue to detect I out and U out , if the output current value I out is less than the current threshold I max and the output voltage value U out is not less than the rated voltage value U o , if so, the inverter system is controlled to be in the voltage source working state, otherwise return to step 2 .
  • a double closed loop control is adopted, wherein the voltage loop is an outer loop and the current loop is an inner loop, and the system presets a given V ref of the voltage loop in advance.
  • the output voltage value U out of the system is used as the feedback of the voltage loop
  • the output of the voltage loop is given as the current loop I ref
  • the output current value I out is used as the feedback of the current loop
  • the output of the current loop is generated by the pulse modulation unit to control the inverse of the drive signal Inverter unit of the variable system.
  • the single current loop is used for control, and the current loop is given as the current setting I ref preset by the inverter system, and the output current value I out is taken as The feedback of the current loop, the output of the current loop is driven by the pulse modulation unit to generate a drive signal to control the inverter unit of the inverter system.
  • the current threshold I max is greater than the rated current I o and less than 2 times the rated current I o .
  • the present invention overcomes the deficiencies of the prior art.
  • the output current value I out exceeds the set current threshold I max (this current threshold I max is smaller than the maximum allowable current of the inverter tube)
  • the inverter system is powered by a voltage source.
  • the output is controlled by the current threshold I max , thereby ensuring that the inverter switch tube does not enter the high frequency current limiting working state, reducing the current stress of the inverter, and improving the reliability and stability of the inverter system. Free switching between voltage type and current type power supply.
  • FIG. 1 is a flow chart of an inverter output overcurrent protection method according to the present invention.
  • the present invention provides an inverter output overcurrent protection method, and the method adopts the following technical solutions:
  • An inverter output overcurrent protection method comprising the following steps:
  • Step 1 detecting the output current value I out and the output voltage value U out of the inverter system in real time;
  • Step 2 determine whether the output current value I out is greater than the preset current threshold I max , if the output current value I out is less than the current threshold I max , then control the inverter system is in the voltage source working state, otherwise proceeds to step 3;
  • Step 3 When the inverter system detects that the output current value I out is greater than or equal to the preset current threshold I max , the inverter system is controlled to be in the current source working state;
  • Step 4 When the control inverter system is in the current source working state, continue to detect I out and U out , if the output current value I out is less than the current threshold I max and the output voltage value U out is not less than the rated voltage value U o , if Then control the inverter system to be in the working state of the voltage source, otherwise return to step 2.
  • double closed loop control is adopted, wherein the voltage loop is an outer loop and the current loop is an inner loop, and the inverter system presets a given V ref of the voltage loop, and the inverter system
  • the output voltage value U out is used as the feedback of the voltage loop
  • the output of the voltage loop is given as the current loop I ref
  • the output current value I out is used as the feedback of the current loop
  • the output of the current loop is driven by the pulse modulation unit to generate the drive signal to control the inverter Inverter unit of the system.
  • the single current loop is used for control, the current loop is given as the current setting I ref preset by the inverter system, and the output current value I out is used as the feedback of the current loop.
  • the output of the current loop is controlled by a pulse modulation unit to generate a drive signal to control the inverter unit of the inverter system.
  • the current threshold I max is greater than the rated current I o and less than 2 times the rated current I o .
  • the current threshold I max is 1.5 times the rated current I o .
  • the current threshold I max is smaller than the allowable maximum current of the inverter tube
  • the inverter inverter system is switched from a voltage type power supply to a current type power supply, and the output is controlled by a current threshold I max , thereby ensuring that the inverter switch tube does not enter the high frequency current limiting operation state, reducing the current stress of the inverter, and improving the inverse
  • the reliability and stability of the variable system enable free switching of voltage-type power supplies and current-mode power supplies.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种逆变输出过流保护方法，包括以下步骤：步骤1：实时检测逆变***的输出电流值Iout和输出电压值Uout；步骤2：判断输出电流值Iout是否大于预先设置的电流阈值Imax，若输出电流值Iout小于电流阈值Imax，则控制逆变***处于电压源工作状态，否则进入步骤3；步骤3：当逆变***检测到输出电流值Iout大于等于预先设置的电流阈值Imax时，控制逆变***处于电流源工作状态；步骤4：若输出电流值Iout小于电流阈值Imax且输出电压值Uout是否不小于额定电压值Uo，若是则控制逆变***处于电压源工作状态，否则返回步骤2。该方法提高逆变***的可靠性和稳定性，实现电压型电源和电流型电源的自由切换。

Description

一种逆变输出过流保护方法 技术领域
本发明涉及电力电子控制领域，特别是涉及一种逆变输出过流保护方法。
背景技术
在电力电子***中，存在电压型电压和电流型电源两种说法，即，电压型电压提供稳定的电压，比如离网逆变器***通常为电压型电源；电流型电源通常提供稳定的电流，比如并网逆变器通常为电流型电源。而逆变器的控制方法必须使得逆变器在任意负载条件下均能够为负载提供高质量、高稳定性的交流输出。但当离网逆变器为电压型电源时，当逆变器输出负载冲击导致过流时，负载超过***的供给功率限制，通常会导致电压下降，而电压型电源为了达到稳压的目标，闭环反馈***就会持续增大逆变器驱动的占空比，直到达到限幅值，而此时有可能逆变器的开关管已处于高频限流的工作状态。此时，逆变器的开关管损耗大，电流应力大，若长时间处于此工作状态，将导致逆变器的可靠性、稳定性降低。
发明内容
针对上述现有技术的不足，本发明提出一种逆变输出过流保护方法，本方法采用以下技术方案实现：
一种逆变输出过流保护方法，其特征在于，包括以下步骤：步骤1：实时检测逆变***的输出电流值Iout和输出电压值Uout；步骤2：判断输出电流值Iout是否大于预先设置的电流阈值Imax，若输出电流值Iout小于电流阈值Imax，则控制逆变***处于电压源工作状态，否则进入步骤3；
步骤3：当逆变***检测到输出电流值Iout大于等于预先设置的电流阈值Imax时，控制逆变***处于电流源工作状态；步骤4：当控制逆变***处于电流源工作状态时，继续检测Iout及Uout，若输出电流值Iout小于电流阈值Imax且输出电压值Uout是否不小于额定电压值Uo，若是则控制逆变***处于电压源工作状态，否则返回步骤2。
在本发明一实施例中，控制逆变***处于电压源状态时，采用双闭环控制，其中电压环为外环、电流环为内环进行控制，***预先预设电压环的给定Vref，***的输出电压值Uout作为电压环的反馈，电压环的输出作为电流环的给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号 控制逆变***的逆变单元。
在本发明一实施例中，控制逆变***处于电流源工作状态时，采用单电流环进行控制，电流环的给定为逆变***预先设置的电流给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号控制逆变***的逆变单元。
在本发明一实施例中，电流阈值Imax大于额定电流Io且小于2倍的额定电流Io。
本发明克服了现有技术的不足，当输出电流值Iout超过设定的电流阈值Imax时(此电流阈值Imax小于逆变管的允许的最大电流)，逆变器***由电压型电源切换到电流型电源，以电流阈值Imax控制输出，从而保证逆变器开关管不进入高频限流的工作状态，减小逆变的电流应力，提高逆变***的可靠性和稳定性，实现电压型电源和电流型电源的自由切换。
附图说明
图1为本发明的一种逆变输出过流保护方法的流程图。
具体实施方式
下面结合附图及实施例对本发明做进一步说明。
针对上述现有技术存在的不足，本发明提出的一种逆变输出过流保护方法，本方法采用以下技术方案实现：
一种逆变输出过流保护方法，所述方法包括以下步骤：
步骤1：实时检测逆变***的输出电流值Iout和输出电压值Uout；
步骤2：判断输出电流值Iout是否大于预先设置的电流阈值Imax，若输出电流值Iout小于电流阈值Imax，则控制逆变***处于电压源工作状态，否则进入步骤3；
步骤3：当逆变***检测到输出电流值Iout大于等于预先设置的电流阈值Imax时，控制逆变***处于电流源工作状态；
步骤4：当控制逆变***处于电流源工作状态时，继续检测Iout及Uout，若输出电流值Iout小于电流阈值Imax且输出电压值Uout是否不小于额定电压值Uo，若是则控制逆变***处于电压源工作状态，否则返回步骤2。
具体流程图参见图1。
进一步的，控制逆变***处于电压源状态时，采用双闭环控制，其中电压环 为外环、电流环为内环进行控制，逆变***预先预设电压环的给定Vref，逆变***的输出电压值Uout作为电压环的反馈，电压环的输出作为电流环的给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号控制逆变***的逆变单元。
进一步的，控制逆变***处于电流源工作状态时，采用单电流环进行控制，电流环的给定为逆变***预先设置的电流给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号控制逆变***的逆变单元。
进一步的，电流阈值Imax大于额定电流Io且小于2倍的额定电流Io。
较佳的，电流阈值Imax为1.5倍的额定电流Io。
当输出电流值Iout超过设定的电流阈值Imax时(为保证开关管的实用寿命依稀逆变器逆变***的安全，因此电流阈值Imax小于逆变管的允许的最大电流)，逆变器逆变***由电压型电源切换到电流型电源，以电流阈值Imax控制输出，从而保证逆变器开关管不进入高频限流的工作状态，减小逆变的电流应力，提高逆变***的可靠性和稳定性，实现电压型电源和电流型电源的自由切换。
以上是本发明的较佳实施例，凡依本发明技术方案所作的改变，所产生的功能作用未超出本发明技术方案的范围时，均属于本发明的保护范围。

Claims (4)

  1. 一种逆变输出过流保护方法，其特征在于，包括以下步骤：
    步骤1：实时检测逆变***的输出电流值Iout和输出电压值Uout；
    步骤2：判断输出电流值Iout是否大于预先设置的电流阈值Imax，若输出电流值Iout小于电流阈值Imax，则控制逆变***处于电压源工作状态，否则进入步骤3；
    步骤3：当逆变***检测到输出电流值Iout大于等于预先设置的电流阈值Imax时，控制逆变***处于电流源工作状态；
    步骤4：当控制逆变***处于电流源工作状态时，继续检测Iout及Uout，若输出电流值Iout小于电流阈值Imax且输出电压值Uout是否不小于额定电压值Uo，若是则控制逆变***处于电压源工作状态，否则返回步骤2。
  2. 根据权利要求1所述的逆变输出过流保护方法，其特征在于：控制逆变***处于电压源状态时，采用双闭环控制，其中电压环为外环、电流环为内环进行控制，逆变***预先预设电压环的给定Vref，逆变***的输出电压值Uout作为电压环的反馈，电压环的输出作为电流环的给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号控制逆变***的逆变单元。
  3. 根据权利要求1所述的逆变输出过流保护方法，其特征在于：控制逆变***处于电流源工作状态时，采用单电流环进行控制，电流环的给定为逆变***预先设置的电流给定Iref，输出电流值Iout作为电流环的反馈，电流环的输出经脉冲调制单元产生驱动信号控制逆变***的逆变单元。
  4. 根据权利要求1所述的逆变输出过流保护方法，其特征在于：电流阈值Imax大于额定电流Io且小于2倍的额定电流Io。
PCT/CN2016/084305 2016-01-26 2016-06-01 一种逆变输出过流保护方法 WO2017128579A1 (zh)

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