CN109980980A - Voltage control device and method of converter and converter - Google Patents
Voltage control device and method of converter and converter Download PDFInfo
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- H02J3/386—
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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
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Description
技术领域technical field
本发明涉及风力发电技术领域，尤其涉及一种变流器的电压控制装置和方法、变流器。The present invention relates to the technical field of wind power generation, in particular to a voltage control device and method of a converter, and a converter.
背景技术Background technique
风力发电机组的经过整流后的发电量需要通过变流器并入电网中。当电网运行不稳定，比如电网电压升高或者跌落，使得能够并入电网的能量减小，但是风力发电机组的输出功率暂时保持不变，引起变流器的输入电压的波动。The rectified power generation of the wind turbine needs to be integrated into the grid through the converter. When the power grid is unstable, such as the grid voltage rises or falls, the energy that can be integrated into the grid decreases, but the output power of the wind turbine remains unchanged temporarily, causing fluctuations in the input voltage of the converter.
为控制变流器的输入电压的波动，现有技术中的方法是由PI调节器根据变换器的输入电压给定值和电压反馈值相减后得到的电压误差，得到调制电压占空比，然后经过PWM发生器转换成PWM信号来驱动控制对象中的IGBT，即根据电压差信号控制变流器的输入电流。In order to control the fluctuation of the input voltage of the converter, the method in the prior art is that the PI regulator obtains the modulation voltage duty cycle according to the voltage error obtained by subtracting the input voltage given value of the converter and the voltage feedback value, Then it is converted into a PWM signal by the PWM generator to drive the IGBT in the control object, that is, the input current of the converter is controlled according to the voltage difference signal.
但是，本申请的发明人发现，现有技术中的根据电压差信号控制变流器的输入电流的方法，需要先将变流器的反馈电压信号转换为电流信号。由于控制环节中存在电压-电流的转换步骤，降低了对变流器电压控制的响应速率。However, the inventors of the present application found that the method of controlling the input current of the converter according to the voltage difference signal in the prior art needs to convert the feedback voltage signal of the converter into a current signal first. Due to the voltage-current conversion step in the control link, the response rate to the voltage control of the converter is reduced.
发明内容SUMMARY OF THE INVENTION
本发明实施例提供了一种变流器的电压控制装置和方法、变流器，能够提高对变流器电压控制的响应速率。Embodiments of the present invention provide a voltage control device and method for a converter, and a converter, which can improve the response rate to the voltage control of the converter.
第一方面，本发明实施例提供了一种变流器的电压控制装置，该装置包括依次连接的第一比较模块、第一反馈调节模块、第二比较模块和第二反馈调节模块；其中，第一比较模块的第一输入端接收变流器的输入电压给定值，第一比较模块的第二输入端接收变流器的反馈电压值，第一反馈调节模块根据第一比较模块的比较结果输出电流给定值，第二比较模块的第一输入端接收第一比较模块输出的电流给定值，第二比较模块的第二输入端接收变流器的电流反馈值，第二反馈调节模块根据第二比较模块的比较结果输出用于驱动变流器中的IGBT的脉冲宽度调制PWM信号，以调整变流器的输入电压。In a first aspect, an embodiment of the present invention provides a voltage control device for a converter, the device includes a first comparison module, a first feedback adjustment module, a second comparison module, and a second feedback adjustment module connected in sequence; wherein, The first input terminal of the first comparison module receives the input voltage given value of the converter, the second input terminal of the first comparison module receives the feedback voltage value of the converter, and the first feedback adjustment module is based on the comparison of the first comparison module. As a result, the given current value is output, the first input terminal of the second comparison module receives the given current value output by the first comparison module, the second input terminal of the second comparison module receives the current feedback value of the converter, and the second feedback adjusts The module outputs a pulse width modulated PWM signal for driving the IGBT in the converter according to the comparison result of the second comparison module, so as to adjust the input voltage of the converter.
在第一方面的一些实施例中，第二反馈调节模块为滞环调节器。In some embodiments of the first aspect, the second feedback regulation module is a hysteresis regulator.
在第一方面的一些实施例中，第一反馈调节模块和第二比较模块之间的线路上设置有限流器，限流器中预设有限流值。In some embodiments of the first aspect, a current limiter is set on the line between the first feedback adjustment module and the second comparison module, and a current limiter value is preset in the current limiter.
在第一方面的一些实施例中，第一反馈调节模块和第二比较模块之间的线路上设置有第一开关器件，第一开关器件用于在变流器的输出端连接到电压源上时断开，且第二比较模块的第一输入端接收预设的外部电流给定值。In some embodiments of the first aspect, a line between the first feedback adjustment module and the second comparison module is provided with a first switching device, and the first switching device is used to connect the output end of the converter to a voltage source It is disconnected when it is turned off, and the first input terminal of the second comparison module receives a preset external current given value.
在第一方面的一些实施例中，变流器为DC/AC变流器，DC/AC变流器的输出端接入三相电网；第二比较模块包括并联设置的三个比较器，第二反馈调节模块包括并联设置的与三个比较器分别连接的三个滞环调节器；该装置还包括锁相环和运算器；其中，锁相环根据三相电网的三相电压信号得到电网相位，运算器根据第一反馈调节模块输出的电流给定值和电网相位，输出三路电流给定值，每个比较器的第一端接收一路电流给定值，每个比较器的第二端接收三相电网中对应相的电流反馈值，每个滞环调节器根据对应比较器的比较结果输出用于驱动DC/AC变流器中对应IGBT的脉冲宽度调制PWM信号，以调整DC/AC变流器的输入电压。In some embodiments of the first aspect, the converter is a DC/AC converter, and the output end of the DC/AC converter is connected to a three-phase power grid; the second comparison module includes three comparators arranged in parallel, the first The two-feedback adjustment module includes three hysteresis regulators arranged in parallel and connected to the three comparators respectively; the device also includes a phase-locked loop and an operator; wherein, the phase-locked loop obtains the power grid according to the three-phase voltage signal of the three-phase power grid Phase, the operator outputs three current given values according to the current given value output by the first feedback adjustment module and the grid phase, the first end of each comparator receives one current given value, the second of each comparator The terminal receives the current feedback value of the corresponding phase in the three-phase power grid, and each hysteresis regulator outputs the pulse width modulation PWM signal used to drive the corresponding IGBT in the DC/AC converter according to the comparison result of the corresponding comparator to adjust the DC/AC The input voltage of the AC converter.
在第一方面的一些实施例中，第一反馈调节模块和第二比较模块之间的线路上设置有第二开关器件，第二开关器件用于在DC/AC变流器的直流侧连接到电压源上时断开，且第二比较模块的第一输入端接收预设的外部电流给定值。In some embodiments of the first aspect, a line between the first feedback adjustment module and the second comparison module is provided with a second switching device, and the second switching device is used to connect to the DC/AC converter on the DC side. When the voltage source is on, it is disconnected, and the first input terminal of the second comparison module receives a preset external current given value.
第二方面，本发明实施例提供了一种变流器的电压控制方法，该方法包括：In a second aspect, an embodiment of the present invention provides a voltage control method for a converter, the method comprising:
由第一反馈调节模块根据变流器的输入电压给定值和变流器的反馈电压值输出电流给定值；The first feedback adjustment module outputs the current given value according to the input voltage given value of the converter and the feedback voltage value of the converter;
由第二反馈调节模块根据第一反馈调节模块输出的电流给定值和变流器的电流反馈值输出用于驱动变流器中的IGBT的PWM信号，以调整变流器的输入电压。The second feedback regulation module outputs a PWM signal for driving the IGBT in the converter according to the current given value output by the first feedback regulation module and the current feedback value of the converter to adjust the input voltage of the converter.
在第二方面的一些实施例中，当变流器的输出端连接到电压源上时，控制第一开关器件断开，且控制第二反馈调节模块接收预设的外部电流给定值。In some embodiments of the second aspect, when the output terminal of the converter is connected to the voltage source, the first switching device is controlled to be disconnected, and the second feedback adjustment module is controlled to receive a preset external current given value.
在第二方面的一些实施例中，变流器为DC/AC变流器，DC/AC变流器的输出端接入三相电网；第二反馈调节模块包括并联设置三个滞环调节器；装置还包括锁相环和运算器；该方法还包括：由锁相环根据三相电网的三相电压信号得到电网相位；由运算器根据第一反馈调节模块输出的电流给定值和电网相位，输出三路电流给定值；由每个滞环调节器根据一路电流给定值和三相电网中对应相的电流反馈值，输出用于驱动DC/AC变流器中对应IGBT的PWM信号，以调整DC/AC变流器的输入电压。In some embodiments of the second aspect, the converter is a DC/AC converter, and the output end of the DC/AC converter is connected to a three-phase power grid; the second feedback adjustment module includes three hysteresis regulators arranged in parallel The device also includes a phase-locked loop and an operator; the method further includes: obtaining the grid phase by the phase-locked loop according to the three-phase voltage signal of the three-phase grid; adjusting the current given value and the grid output by the operator according to the first feedback adjustment module Phase, output three current given values; each hysteresis regulator outputs the PWM used to drive the corresponding IGBT in the DC/AC converter according to one current given value and the current feedback value of the corresponding phase in the three-phase power grid signal to adjust the input voltage of the DC/AC converter.
第三方面，本发明实施例提供了一种变流器，该变流器包括如上所述变流器的电压控制装置。In a third aspect, an embodiment of the present invention provides a converter, where the converter includes the voltage control device of the converter as described above.
如上所述，本发明实施例中的变流器的电压控制装置在第一比较模块和第一反馈调节模块的基础上，增加了第二比较模块和第二反馈调节模块，建立了对变流器的输入电压的电流内环控制机制。与现有技术中的需要先将变流器的反馈电压信号转换为电流信号(电压外环)，需要等到输出电压产生足够大的变化时才能产生修正作用相比，本发明实施例中的电流内环具有响应速度快的优点，当变流器的输入电流减小后，会立即更新第二反馈调节模块中PWM信号占空比，从而避免了输出电压不必要的波动，使变流器的供电电压更加稳定。As described above, the voltage control device of the converter in the embodiment of the present invention adds the second comparison module and the second feedback adjustment module on the basis of the first comparison module and the first feedback adjustment module, and establishes the The current inner loop control mechanism of the input voltage of the device. Compared with the prior art, which needs to convert the feedback voltage signal of the converter into a current signal (voltage outer loop) first, and needs to wait until the output voltage changes sufficiently, the correction effect can be generated. The inner loop has the advantage of fast response. When the input current of the converter decreases, the duty cycle of the PWM signal in the second feedback adjustment module will be updated immediately, thereby avoiding unnecessary fluctuations in the output voltage and making the converter's The supply voltage is more stable.
附图说明Description of drawings
从下面结合附图对本发明的具体实施方式的描述中可以更好地理解本发明其中，相同或相似的附图标记表示相同或相似的特征。The present invention can be better understood from the following description of specific embodiments of the present invention in conjunction with the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.
图1为本发明实施例提供的变流器的电压控制装置的结构示意图；FIG. 1 is a schematic structural diagram of a voltage control device of a converter according to an embodiment of the present invention;
图2为本发明另一实施例提供的变流器的电压控制装置的结构示意图；2 is a schematic structural diagram of a voltage control device for a converter according to another embodiment of the present invention;
图3为本发明又一实施例提供的变流器的电压控制装置的结构示意图；FIG. 3 is a schematic structural diagram of a voltage control device for a converter according to another embodiment of the present invention;
图4为本发明一实施例提供的变流器的电压控制方法的流程示意图；4 is a schematic flowchart of a voltage control method for a converter according to an embodiment of the present invention;
图5为本发明另一实施例提供的变流器的电压控制方法的流程示意图。FIG. 5 is a schematic flowchart of a voltage control method for a converter according to another embodiment of the present invention.
附图标记说明：Description of reference numbers:
101-第一比较模块；102-第一反馈调节模块；103-第二比较模块；101 - the first comparison module; 102 - the first feedback adjustment module; 103 - the second comparison module;
104-第二反馈调节模块；105-变流器；1011-第一比较器；104 - the second feedback adjustment module; 105 - the converter; 1011 - the first comparator;
1021-PI调节器；1031-第二比较器；1041-滞环调节器；1021-PI regulator; 1031-second comparator; 1041-hysteresis regulator;
1051-DC/AC变流器；302-锁相环；303-运算器。1051-DC/AC converter; 302-phase-locked loop; 303-calculator.
具体实施方式Detailed ways
下面将详细描述本发明实施例的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本发明实施例的全面理解。Features and exemplary embodiments of various aspects of embodiments of the present invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present invention.
本发明实施例提供了一种变流器的电压控制装置和方法、变流器，用于对风力发电机组的变流器的输入电压进行控制，采用本发明实施例中的技术方案，能够通过设置电流内环提高对变流器电压控制的响应速率。The embodiments of the present invention provide a voltage control device and method for a converter, and a converter, which are used to control the input voltage of the converter of a wind turbine. By using the technical solutions in the embodiments of the present invention, the Setting the current inner loop increases the response rate to the converter voltage control.
图1为本发明实施例提供的变流器105的电压控制装置的结构示意图。如图1所示，变流器105的电压控制装置包括依次连接的第一比较模块101、第一反馈调节模块102、第二比较模块103和第二反馈调节模块104。FIG. 1 is a schematic structural diagram of a voltage control device of a converter 105 according to an embodiment of the present invention. As shown in FIG. 1 , the voltage control device of the converter 105 includes a first comparison module 101 , a first feedback adjustment module 102 , a second comparison module 103 and a second feedback adjustment module 104 which are connected in sequence.
其中，第一比较模块101的第一输入端接收变流器105的输入电压给定值U*，第一比较模块101的第二输入端接收变流器105的反馈电压值u，第一反馈调节模块102根据第一比较模块101的比较结果输出电流给定值I*，第二比较模块103的第一输入端接收第一比较模块101输出的电流给定值I*，第二比较模块103的第二输入端接收变流器105的电流反馈值i，第二反馈调节模块104根据第二比较模块103的比较结果输出用于驱动变流器105中的IGBT的脉冲宽度调制PWM信号，以调整变流器105的输入电压。The first input terminal of the first comparison module 101 receives the input voltage given value U* of the converter 105, the second input terminal of the first comparison module 101 receives the feedback voltage value u of the converter 105, and the first feedback The adjustment module 102 outputs a given current value I* according to the comparison result of the first comparison module 101, the first input terminal of the second comparison module 103 receives the given current value I* output by the first comparison module 101, and the second comparison module 103 The second input terminal of the converter 105 receives the current feedback value i of the converter 105, and the second feedback adjustment module 104 outputs a pulse width modulated PWM signal for driving the IGBT in the converter 105 according to the comparison result of the second comparison module 103, so as to The input voltage of the converter 105 is adjusted.
如上所述，本发明实施例中的变流器105的电压控制装置在第一比较模块101和第一反馈调节模块102的基础上，增加了第二比较模块103和第二反馈调节模块104，建立了对变流器105的输入电压的电流内环控制机制。与现有技术中的需要先将变流器105的反馈电压信号转换为电流信号(电压外环)，需要等到输出电压产生足够大的变化时才能产生修正作用相比，本发明实施例中的电流内环具有响应速度快的优点，当变流器105的输入电流减小后，会立即更新第二反馈调节模块104中PWM信号占空比，从而避免了输出电压不必要的波动，使变流器105的供电电压更加稳定。As described above, the voltage control device of the converter 105 in the embodiment of the present invention adds the second comparison module 103 and the second feedback adjustment module 104 on the basis of the first comparison module 101 and the first feedback adjustment module 102, A current inner loop control mechanism for the input voltage of the converter 105 is established. Compared with the prior art, which needs to first convert the feedback voltage signal of the converter 105 into a current signal (voltage outer loop), and needs to wait until the output voltage changes sufficiently, the correction effect can be generated. The current inner loop has the advantage of fast response. When the input current of the converter 105 decreases, the duty cycle of the PWM signal in the second feedback adjustment module 104 will be updated immediately, so as to avoid unnecessary fluctuations in the output voltage and make the inverter The supply voltage of the current transformer 105 is more stable.
此外，变流器105的电压波动的减小意味着在对变流器105中的电容选型时可以将容值选小一些，有利于降低变流器105的成本和体积。In addition, the reduction of the voltage fluctuation of the converter 105 means that the capacitance value of the converter 105 can be selected to be smaller, which is beneficial to reduce the cost and volume of the converter 105 .
图2为本发明另一实施例提供的变流器的电压控制装置的结构示意图。图2与图1的不同之处在于，图2中的第一反馈调节模块102具体为PI调节器1021，第二反馈调节模块104具体为滞环调节器1041，第一比较模块101具体为第一比较器1011，第二比较模块103具体为第二比较器1031。FIG. 2 is a schematic structural diagram of a voltage control device of a converter according to another embodiment of the present invention. The difference between FIG. 2 and FIG. 1 is that the first feedback adjustment module 102 in FIG. 2 is specifically a PI regulator 1021, the second feedback adjustment module 104 is specifically a hysteresis regulator 1041, and the first comparison module 101 is specifically a first comparison module 101. A comparator 1011 , and the second comparison module 103 is specifically a second comparator 1031 .
由于与其他类型的反馈调节器相比，滞环调节器1041具有响应速度快的优点，因此，本发明实施例中优选第二反馈调节模块104为滞环调节器1041。Compared with other types of feedback regulators, the hysteresis regulator 1041 has the advantage of fast response speed. Therefore, in the embodiment of the present invention, the second feedback regulation module 104 is preferably the hysteresis regulator 1041 .
图2的示例中的变流器105的电压控制装置的工作原理为：第一比较器1011的第一输入端接收变流器105的输入电压给定值U*，第一比较器1011的第二输入端接收变流器105的反馈电压值u，PI调节器1021根据第一比较器1011的比较结果U*-u输出电流给定值I*，第二比较器1031的第一输入端接收第一比较器1011输出的电流给定值I*，第二比较器1031的第二输入端接收变流器105的电流反馈值i，滞环调节器1041根据第二比较器1031的比较结果I*-i输出用于驱动变流器105中的IGBT的脉冲宽度调制PWM信号，以调整变流器105的输入电压。The working principle of the voltage control device of the converter 105 in the example of FIG. 2 is as follows: the first input terminal of the first comparator 1011 receives the input voltage given value U* of the converter 105 , and the first input terminal of the first comparator 1011 The two input terminals receive the feedback voltage value u of the converter 105, the PI regulator 1021 outputs a given current value I* according to the comparison result U*-u of the first comparator 1011, and the first input terminal of the second comparator 1031 receives The given current value I* output by the first comparator 1011, the second input terminal of the second comparator 1031 receives the current feedback value i of the converter 105, and the hysteresis regulator 1041 according to the comparison result I of the second comparator 1031 *-i outputs a pulse width modulated PWM signal for driving the IGBTs in the converter 105 to adjust the input voltage of the converter 105 .
根据本发明的实施例，为防止变流器105的输入电流过大的情况出现，还可以对PI调节器1021输出的电流给定值I*进行限流，具体地，可以在PI调节器1021和第二比较器1031之间的线路上设置限流器(图中未示出)，限流器中预设有限流值，比如变流器105的最大运行电流。如此设置，当负载突然加重时，一旦电流给定信号达到最大，就会被限制住，使系统以最大电流运行，从而避免重载运行时因未对电流加以限制而导致的过流故障问题。According to the embodiment of the present invention, in order to prevent the situation that the input current of the converter 105 is too large, the current setting value I* output by the PI regulator 1021 can also be limited. A current limiter (not shown in the figure) is set on the line between the second comparator 1031 , and a current limit value is preset in the current limiter, such as the maximum operating current of the converter 105 . With this setting, when the load suddenly increases, once the current given signal reaches the maximum, it will be limited, so that the system will run at the maximum current, thus avoiding the overcurrent fault problem caused by the unlimited current during heavy-load operation.
根据本发明的实施例，在一些仅需要对变流器105的输入进行电流的工况下，比如当变流器105的输出端接到电压源上时，可将电压外环断开。比如，在PI调节器1021和第二比较器1031之间的线路上设置有第一开关器件(图中未示出)，当变流器105的输出端连接到电压源上时断开，且第二比较模块103的第一输入端接收预设的外部电流给定值(比如，由用户直接设置电流给定信号)。如此设置，一方面控制了变流器105的输入功率，另一方面控制了输出到电压源的功率，从而达到对变流器105的精准控制。此外，为灵活应对不同工况，还可以在线切换这两种工作方式。According to the embodiment of the present invention, in some working conditions that only need to supply current to the input of the converter 105 , such as when the output terminal of the converter 105 is connected to a voltage source, the voltage outer loop can be disconnected. For example, a first switching device (not shown in the figure) is provided on the line between the PI regulator 1021 and the second comparator 1031, which is disconnected when the output end of the converter 105 is connected to the voltage source, and The first input terminal of the second comparison module 103 receives a preset external current given value (eg, the current given signal is directly set by the user). In this way, the input power of the converter 105 is controlled on the one hand, and the power output to the voltage source is controlled on the other hand, so as to achieve precise control of the converter 105 . In addition, in order to flexibly respond to different working conditions, the two working modes can be switched online.
需要说明的是，风力发电机组中的变流器包括DC/DC变流器和DC/AC变流器，当变流器为DC/DC变流器时，可以直接按照图2中的接线方式构建本发明实施例中的变流器的电压控制装置。当变流器为DC/AC变流器时，由于DC/AC变流器的输出端接入到三相电网，因此需要对图2中的变流器的电压控制装置进行调整。It should be noted that the converters in the wind turbine include DC/DC converters and DC/AC converters. When the converters are DC/DC converters, you can directly follow the wiring method in Figure 2 The voltage control device of the converter in the embodiment of the present invention is constructed. When the converter is a DC/AC converter, since the output end of the DC/AC converter is connected to a three-phase power grid, the voltage control device of the converter in FIG. 2 needs to be adjusted.
图3为本发明又一实施例提供的变流器的电压控制装置的结构示意图，用于展示当变流器为DC/AC变流器时，变流器的电压控制装置的各部件之间的连接结构。与图2的不同的是，图3中的变流器的电压控制装置还包括锁相环302和运算器303，且第二比较模块103包括并联设置的三个比较器，第二反馈调节模块104包括并联设置的与三个比较器分别连接的三个滞环调节器。FIG. 3 is a schematic structural diagram of a voltage control device for a converter according to still another embodiment of the present invention, which is used to show that when the converter is a DC/AC converter, the components of the voltage control device for the converter connection structure. The difference from FIG. 2 is that the voltage control device of the converter in FIG. 3 further includes a phase-locked loop 302 and an operator 303, and the second comparison module 103 includes three comparators arranged in parallel, and the second feedback adjustment module 104 includes three hysteresis regulators arranged in parallel and connected to the three comparators, respectively.
图3的示例中的DC/AC变流器1051的电压控制装置的工作原理为：The working principle of the voltage control device of the DC/AC converter 1051 in the example of FIG. 3 is:
第一比较器1011的第一输入端接收变流器的输入电压给定值Udc*，第一比较器1011的第二输入端接收变流器的反馈电压值Udc，PI调节器根据第一比较器1011的比较结果Udc*-Udc输出电流给定值Idc *；锁相环302根据三相电网的三相电压信号(Ua，Ub，Uc)得到电网相位θ，运算器303根据PI调节器输出的电流给定值Idc *和电网相位θ，输出三路电流给定值每个比较器的第一端接收一路电流给定值，每个比较器的第二端接收三相电网中对应相的电流反馈值，每个滞环调节器根据对应比较器的比较结果输出用于驱动DC/AC变流器1051中对应IGBT的脉冲宽度调制PWM信号，以调整DC/AC变流器1051的输入电压。The first input terminal of the first comparator 1011 receives the input voltage given value U dc * of the converter, and the second input terminal of the first comparator 1011 receives the feedback voltage value U dc of the converter. A comparison result of the comparator 1011 U dc *-U dc output current given value I dc * ; the phase-locked loop 302 obtains the grid phase θ according to the three-phase voltage signals (U a , U b , U c ) of the three-phase grid, The calculator 303 outputs the three-way current given value according to the current given value I dc * output by the PI regulator and the grid phase θ The first end of each comparator receives a given current value, the second end of each comparator receives the current feedback value of the corresponding phase in the three-phase power grid, and each hysteresis regulator outputs the output signal according to the comparison result of the corresponding comparator. The pulse width modulation PWM signal corresponding to the IGBT in the driving DC/AC converter 1051 is used to adjust the input voltage of the DC/AC converter 1051 .
根据本发明实施例，当Ua，Ub和Uc为三相电压源时，通过同时控制交流电流和直流电压，可使得直流电压具有良好的稳定性。According to the embodiment of the present invention, when U a , U b and U c are three-phase voltage sources, by controlling the alternating current and the direct voltage at the same time, the direct current voltage can have good stability.
当直流侧接电压源时，可断开电压环。比如，可以在PI调节器和第二比较模块103之间的线路上设置有第二开关器件，第二开关器件用于在DC/AC变流器1051的直流侧连接到电压源上时断开，且由第二比较模块103的第一输入端接收预设的外部电流给定值Idc *，比如，由用户直接给定Idc *，来控制输入到DC/AC变流器1051直流侧的功率。When the DC side is connected to a voltage source, the voltage loop can be disconnected. For example, a second switching device may be provided on the line between the PI regulator and the second comparison module 103, and the second switching device is used to disconnect when the DC side of the DC/AC converter 1051 is connected to the voltage source , and the preset external current given value I dc * is received by the first input terminal of the second comparison module 103 , for example, I dc * is directly given by the user to control the input to the DC side of the DC/AC converter 1051 of power.
图4为本发明一实施例提供的变流器的电压控制方法的流程示意图，用于对图1和图2中的变流器的电压控制装置。图4中示出了步骤401至步骤404。FIG. 4 is a schematic flowchart of a voltage control method of a converter according to an embodiment of the present invention, which is used for the voltage control device of the converter in FIGS. 1 and 2 . Steps 401 to 404 are shown in FIG. 4 .
在步骤401中，由第一比较模块101的第一输入端接收变流器的输入电压给定值，第一比较模块101的第二输入端接收变流器的反馈电压值。In step 401 , the input voltage given value of the converter is received by the first input terminal of the first comparison module 101 , and the feedback voltage value of the converter is received by the second input terminal of the first comparison module 101 .
在步骤402中，由第一反馈调节模块102根据第一比较模块101的比较结果输出电流给定值。In step 402 , the given current value is output by the first feedback adjustment module 102 according to the comparison result of the first comparison module 101 .
在步骤403中，由第二比较模块103的第一输入端接收第一比较模块101输出的电流给定值，第二比较模块103的第二输入端接收变流器的电流反馈值。In step 403, the first input terminal of the second comparison module 103 receives the current given value output by the first comparison module 101, and the second input terminal of the second comparison module 103 receives the current feedback value of the converter.
在步骤404中，由第二反馈调节模块104根据第二比较模块103的比较结果输出用于驱动变流器中的IGBT的PWM信号，以调整变流器的输入电压。In step 404, the second feedback adjustment module 104 outputs a PWM signal for driving the IGBT in the converter according to the comparison result of the second comparison module 103, so as to adjust the input voltage of the converter.
根据本发明的实施例，在一些仅需要对变流器的输入进行电流的工况下，可以控制第一开关器件在变流器的输出端连接到电压源上时断开，且由第二比较模块103的第一输入端接收预设的外部电流给定值。According to the embodiments of the present invention, under some working conditions that only need to supply current to the input of the converter, the first switching device can be controlled to be disconnected when the output end of the converter is connected to the voltage source, and the second switching device can be controlled to turn off when the output end of the converter is connected to the voltage source. The first input terminal of the comparison module 103 receives a preset external current given value.
图5为本发明另一实施例提供的变流器的电压控制方法的流程示意图，用于对图3中的DC/AC变流器1051的电压控制装置。图5与图4的不同之处在于，图5中还包括步骤405至步骤408。FIG. 5 is a schematic flowchart of a voltage control method for a converter according to another embodiment of the present invention, which is used to control the voltage of the DC/AC converter 1051 in FIG. 3 . The difference between FIG. 5 and FIG. 4 is that FIG. 5 further includes steps 405 to 408 .
在步骤405中，由锁相环302根据三相电网的三相电压信号得到电网相位。In step 405, the phase of the grid is obtained by the phase-locked loop 302 according to the three-phase voltage signal of the three-phase grid.
在步骤406中，由运算器303根据第一反馈调节模块102输出的电流给定值和电网相位，输出三路电流给定值。In step 406, the calculator 303 outputs the three-way current given value according to the current given value and the grid phase output by the first feedback adjustment module 102.
在步骤407中，由每个比较器的第一端接收一路电流给定值，每个比较器的第二端接收三相电网中对应相的电流反馈值。In step 407, the first terminal of each comparator receives a current given value, and the second terminal of each comparator receives the current feedback value of the corresponding phase in the three-phase power grid.
在步骤408中，由每个滞环调节器根据对应比较器的比较结果输出用于驱动DC/AC变流器1051中对应IGBT的脉冲宽度调制PWM信号，以调整DC/AC变流器1051的输入电压。In step 408 , each hysteresis regulator outputs a pulse width modulated PWM signal for driving the corresponding IGBT in the DC/AC converter 1051 according to the comparison result of the corresponding comparator, so as to adjust the DC/AC converter 1051 Input voltage.
本发明实施例还提供一种变流器，该变流器包括如上所述的变流器的电压控制装置。An embodiment of the present invention also provides a converter, which includes the above-mentioned voltage control device for the converter.
需要明确的是，本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同或相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。对于装置实施例而言，相关之处可以参见方法实施例的说明部分。本发明实施例并不局限于上文所描述并在图中示出的特定步骤和结构。本领域的技术人员可以在领会本发明实施例的精神之后，作出各种改变、修改和添加，或者改变步骤之间的顺序。并且，为了简明起见，这里省略对已知方法技术的详细描述。It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment may be referred to each other, and each embodiment focuses on the differences from other embodiments. place. For the apparatus embodiment, reference may be made to the description part of the method embodiment for relevant places. Embodiments of the present invention are not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art may make various changes, modifications and additions, or change the order between steps, after comprehending the spirit of the embodiments of the present invention. Also, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.
以上所述的结构框图中所示的功能块可以实现为硬件、软件、固件或者它们的组合。当以硬件方式实现时，其可以例如是电子电路、专用集成电路(ASIC)、适当的固件、插件、功能卡等等。当以软件方式实现时，本发明实施例的元素是被用于执行所需任务的程序或者代码段。程序或者代码段可以存储在机器可读介质中，或者通过载波中携带的数据信号在传输介质或者通信链路上传送。“机器可读介质”可以包括能够存储或传输信息的任何介质。机器可读介质的例子包括电子电路、半导体存储器设备、ROM、闪存、可擦除ROM(EROM)、软盘、CD-ROM、光盘、硬盘、光纤介质、射频(RF)链路，等等。代码段可以经由诸如因特网、内联网等的计算机网络被下载。The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of embodiments of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.
本发明实施例可以以其他的具体形式实现，而不脱离其精神和本质特征。例如，特定实施例中所描述的算法可以被修改，而系统体系结构并不脱离本发明实施例的基本精神。因此，当前的实施例在所有方面都被看作是示例性的而非限定性的，本发明实施例的范围由所附权利要求而非上述描述定义，并且，落入权利要求的含义和等同物的范围内的全部改变从而都被包括在本发明实施例的范围之中。The embodiments of the present invention may be implemented in other specific forms without departing from the spirit and essential characteristics thereof. For example, the algorithms described in particular embodiments may be modified without departing from the basic spirit of the embodiments of the invention in system architecture. Accordingly, the present embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the embodiments of the present invention is defined by the appended claims rather than the foregoing description, and falls within the meaning and equivalence of the claims All changes within the scope of the present invention are thus included in the scope of the embodiments of the present invention.
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