CN108206537A - Source of resistance Large-power High-Speed generator connecting in parallel with system system and its control method based on MMC - Google Patents
Source of resistance Large-power High-Speed generator connecting in parallel with system system and its control method based on MMC Download PDFInfo
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- 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
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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
- H02M1/42—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
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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
- H02M7/02—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
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
本发明公开了一种基于MMC整流的阻抗源大功率高速发电机并网系统及其控制方法，基于MMC整流的阻抗源大功率高速发电机并网系统包括：一台大功率高速发电机、一台MMC整流装置、一台阻抗源逆变器、一台三相滤波电抗器和两套控制器。本发明还公开了上述系统的控制方法，机侧引入MMC整流装置，对大功率高速发电机的转速和整流装置输入功率因数进行双闭环控制，网侧引入阻抗源逆变器，对阻抗源网络电容电压和并网功率因数进行双闭环控制。本发明可以解决大功率高速发电机定子电流畸变严重的问题，降低单个开关器件的电压应力，从而提高系统的可靠性和效率。
The invention discloses an impedance source high-power high-speed generator grid connection system based on MMC rectification and a control method thereof. The MMC rectification-based impedance source high-power high-speed generator grid connection system includes: a high-power high-speed generator, a MMC rectifier, an impedance source inverter, a three-phase filter reactor and two sets of controllers. The invention also discloses the control method of the above system. The MMC rectification device is introduced on the machine side to perform double closed-loop control on the speed of the high-power high-speed generator and the input power factor of the rectifier device. The grid side introduces an impedance source inverter to control the impedance source network. Capacitor voltage and grid-connected power factor are under double closed-loop control. The invention can solve the problem of serious distortion of the stator current of the high-power and high-speed generator, reduce the voltage stress of a single switching device, thereby improving the reliability and efficiency of the system.
Description
技术领域technical field
本发明属于发电机并网控制领域，具体涉及一种基于MMC的阻抗源大功率高速发电机并网系统及其控制方法。The invention belongs to the field of generator grid-connected control, in particular to an MMC-based impedance source high-power, high-speed generator grid-connected system and a control method thereof.
背景技术Background technique
能源是推动经济发展和社会进步的动力源泉，是关系到国计民生、社会稳定的重要物 质。随着我国现代工业的飞速发展，石油、天然气和煤炭等化石能源逐渐枯竭、环境问题日 益凸显，能源和环境已成为我国所面临的重大问题。Energy is the source of power to promote economic development and social progress, and is an important material related to the national economy, the people's livelihood and social stability. With the rapid development of my country's modern industry, fossil energy sources such as oil, natural gas and coal are gradually exhausted, and environmental problems are becoming increasingly prominent. Energy and the environment have become major issues facing our country.
余热是指煤炭、石油、天然气等经过工业利用后排放出来的、无法继续参与其它生产过程的能量。它以高温热能为表现形式，以废气、废渣和废水为能量载体。我国余热资源非常丰富，占工业总能耗的20%左右。因此，余热利用具有广阔的市场前景。Waste heat refers to the energy discharged after industrial utilization of coal, oil, and natural gas, which cannot continue to participate in other production processes. It is manifested in the form of high-temperature heat energy, and waste gas, waste residue and waste water are used as energy carriers. my country's waste heat resources are very rich, accounting for about 20% of the total industrial energy consumption. Therefore, waste heat utilization has broad market prospects.
大功率高速永磁同步发电机具有效率高、可靠性高、结构紧凑、维护量小等优点，与此同时，高速发电机与膨胀涡轮机直接相连组成的发电机组，中间可省去减速装置，可大大减小系统体积，提高系统效率和可靠性。因此，大功率高速发电机被广泛应用于余热发电系统。The high-power high-speed permanent magnet synchronous generator has the advantages of high efficiency, high reliability, compact structure, and low maintenance. Greatly reduce system volume, improve system efficiency and reliability. Therefore, high-power high-speed generators are widely used in waste heat power generation systems.
传统大功率高速发电机采用三相六开关PWM整流拓扑，随着高速发电机额定转速的不断提高，高速发电机的输出频率大幅提高，甚至有可能达到上千赫兹，为高速发电机的整流调制带来困难，由此产生的发电机定子电流谐波不仅会增加高速发电机的损耗和温升，还会增加其转矩脉动，威胁系统安全。与此同时，随着发电机功率的增大，整流器件的开关应力随之增大。因此，有必要设计一种高可靠性的大功率高速发电机并网系统及其控制方法。Traditional high-power high-speed generators use a three-phase six-switch PWM rectification topology. With the continuous increase in the rated speed of high-speed generators, the output frequency of high-speed generators has increased significantly, and may even reach thousands of Hertz. The resulting harmonics of the stator current of the generator will not only increase the loss and temperature rise of the high-speed generator, but also increase its torque ripple, threatening the safety of the system. At the same time, as the power of the generator increases, the switching stress of the rectifier device increases accordingly. Therefore, it is necessary to design a high-reliability high-power high-speed generator grid-connected system and its control method.
发明内容Contents of the invention
针对背景技术所述的缺陷或不足，本发明提供了一种基于MMC的阻抗源大功率高速发电机并网系统及其控制方法，系统具有更高的可靠性与安全性。Aiming at the defects or deficiencies described in the background technology, the present invention provides an impedance source high-power high-speed generator grid-connected system and its control method based on MMC, and the system has higher reliability and safety.
一种基于MMC整流的阻抗源大功率高速发电机并网系统，包括一台大功率高速永磁同步发电机、一台MMC整流器、一台阻抗源逆变器（Z源逆变器、准Z源逆变器或半准Z源逆变器等阻抗源逆变器）、一台三相滤波电抗器和两套控制器（控制器1和控制器2），两套控制器分别对MMC整流器和阻抗源逆变器进行控制。An impedance source high-power high-speed generator grid-connected system based on MMC rectification, including a high-power high-speed permanent magnet synchronous generator, an MMC rectifier, and an impedance source inverter (Z-source inverter, quasi-Z source Inverter or semi-quasi-Z source inverter and other impedance source inverter), a three-phase filter reactor and two sets of controllers (controller 1 and controller 2), two sets of controllers are used for MMC rectifier and The impedance source inverter is controlled.
所述MMC整流器由三3个桥臂并联组成，每一个桥臂由2n个子模块串联组成，每个子模块由两个IGBT串联后再并联一个电容构成；所述阻抗源逆变器由电感、电容、二极管构成的阻抗源网络和三个3个IGBT半桥电路并联组成；所述并网滤波电抗器由3个交流电感构成。The MMC rectifier is composed of three bridge arms connected in parallel, each bridge arm is composed of 2n sub-modules in series, and each sub-module is composed of two IGBTs connected in series and then connected in parallel with a capacitor; the impedance source inverter is composed of an inductor, a capacitor 1, an impedance source network composed of diodes and three IGBT half-bridge circuits connected in parallel; the grid-connected filter reactor is composed of three AC inductances.
所述大功率高速永磁同步发电机的三相定子分别与MMC整流器三个桥臂的中点相连；所述MMC整流器的公共直流侧与阻抗源逆变器的输入端并联；所述阻抗源逆变器三相输出端接滤波电抗器后并入电网。The three-phase stator of the high-power high-speed permanent magnet synchronous generator is respectively connected to the midpoint of the three bridge arms of the MMC rectifier; the common DC side of the MMC rectifier is connected in parallel with the input end of the impedance source inverter; the impedance source The three-phase output terminal of the inverter is connected to the power grid after being connected with a filter reactor.
所述控制器1用于采集大功率高速永磁同步发电机的转速、转子位置角和三相定子电流，随后通过脉冲触发信号对发电机的转速和MMC整流器输入功率因数进行控制；所述控制器2用于采集阻抗源网络电容的端电压、阻抗源逆变器三相并网电压和阻抗源逆变器三相并网电流，随后通过直通控制策略构造出带直通零矢量的PWM脉冲信号，对阻抗源网络电容电压和并网功率因数进行控制。The controller 1 is used to collect the rotating speed, the rotor position angle and the three-phase stator current of the high-power high-speed permanent magnet synchronous generator, and then control the rotating speed of the generator and the input power factor of the MMC rectifier through the pulse trigger signal; the control The device 2 is used to collect the terminal voltage of the impedance source network capacitance, the three-phase grid-connected voltage of the impedance source inverter and the three-phase grid-connected current of the impedance source inverter, and then construct a PWM pulse signal with a through-zero vector through the through-through control strategy , to control the impedance source network capacitance voltage and grid power factor.
上述基于MMC整流的阻抗源大功率高速发电机并网系统的控制方法包括如下步骤：The control method of the above-mentioned MMC rectification-based impedance source high-power high-speed generator grid-connected system includes the following steps:
(1) 实时检测高速永磁同步发电机的转速ω r 、转子位置角Ө r 和高速发电机的三相定子电流；(1) Real-time detection of the speed ω r of the high-speed permanent magnet synchronous generator, the rotor position angle Ө r and the three-phase stator current of the high-speed generator;
(2) 利用所述的转子位置角Ө r 对高速发电机的三相定子电流进行dq变换，得到三相定子电流的dq轴分量；(2) Utilize described rotor position angle Ө r to carry out dq conversion to the three-phase stator current of high-speed generator, obtain the dq axis component of three-phase stator current;
(3) 通过机侧双闭环控制方法对高速发电机转速、发电机定子电流的dq轴分量进行比较计算，得到机侧电压参考值αβ分量；(3) Comparing and calculating the dq- axis components of the high-speed generator speed and the generator stator current through the machine-side double closed-loop control method to obtain the machine-side voltage reference value αβ component;
(4) 实时检测阻抗源逆变器三相并网线电压和相电流，进而估算出相角Ө；(4) Real-time detection of the three-phase grid-connected line voltage and phase current of the impedance source inverter, and then estimate the phase angle Ө ;
(5) 利用所述的相角Ө对阻抗源逆变器三相并网电压和三相并网电流进行dq变换，得到三相并网电压的dq轴分量和三相并网电流的dq轴分量；(5) Use the phase angle Ө to perform dq transformation on the three-phase grid-connected voltage and three-phase grid-connected current of the impedance source inverter, and obtain the dq- axis components of the three-phase grid-connected voltage and the dq -axis of the three-phase grid-connected current weight;
(6) 实时检测阻抗源网络电容的电压V C1 ；(6) Real-time detection of the voltage V C1 of the impedance source network capacitance;
(7) 通过网侧双闭环控制方法对阻抗源逆变器三相并网电压、并网电流的dq轴分量、相角Ө和阻抗源网络电容电压V C1 进行比较计算，得到网侧电压参考值αβ分量；(7) Comparing and calculating the three-phase grid-connected voltage of the impedance source inverter, the dq -axis component of the grid-connected current, the phase angle Ө , and the impedance source network capacitance voltage V C1 through the grid-side double closed-loop control method to obtain the grid-side voltage reference value αβ component;
(8) 将直通占空比d 0 和(7)中得到的电压参考值αβ分量输入带直通零矢量的空间矢量脉冲宽度调制控制器，得到阻抗源逆变器并网的控制脉冲信号。(8) Input the through-duty cycle d 0 and the voltage reference αβ component obtained in (7) into the space vector pulse width modulation controller with through-zero vector to obtain the control pulse signal of the impedance source inverter connected to the grid.
所述的步骤(3)中的机侧双闭环控制以高速发电机的转速稳定和定子电流谐波小为控制目标。The machine-side double closed-loop control in the step (3) takes the stable speed of the high-speed generator and the small harmonics of the stator current as the control objectives.
所述的步骤(3)中机侧电压参考值αβ分量具体由如下方法获得：将高速发电机转速的参考值和检测值进行比较，通过PI调节器后得到高速发电机q轴电流参考值，给定高速发电机d轴电流参考值为0，将高速发电机定子dq轴电流参考值和检测值进行比较后，通过PI调节器得到调制所需的电压给定dq轴分量，再通过dq-αβ变换将其转化为机侧电压参考值αβ分量。In the step (3), the machine-side voltage reference value αβ component is specifically obtained by the following method: the reference value of the high-speed generator speed is compared with the detected value, and the q- axis current reference value of the high-speed generator is obtained after passing through the PI regulator. Given that the d -axis current reference value of the high-speed generator is 0, after comparing the reference value of the dq- axis current reference value of the high-speed generator stator with the detected value, the voltage required for modulation is obtained through the PI regulator to give the dq- axis components, and then through the dq- The αβ transformation transforms it into the αβ component of the machine-side voltage reference value.
所述的步骤(7)中网侧双闭环控制方法以阻抗源网络电容电压稳定和单位功率因数并网为控制目标。The grid-side double closed-loop control method in the step (7) takes the impedance source network capacitor voltage stability and unity power factor grid connection as the control objectives.
所述的步骤(7)中网侧电压参考值αβ分量具体由如下方法获得：将阻抗源网络电容电压的参考值和检测值进行比较，通过PI调节器后得到并网电流d轴参考值，给定并网电流q轴参考值为0，将并网电流dq轴参考值和检测值进行比较后，通过PI调节器得到调制所需的电压给定dq轴分量，再通过dq-αβ变换将其转化为网侧电压参考值αβ分量。The grid-side voltage reference value αβ component in the step (7) is specifically obtained by the following method: comparing the reference value of the capacitance voltage of the impedance source network with the detection value, and obtaining the d- axis reference value of the grid-connected current through the PI regulator, The q- axis reference value of the grid-connected current is given as 0. After comparing the dq- axis reference value of the grid-connected current with the detected value, the given dq -axis components of the voltage required for modulation are obtained through the PI regulator, and then the dq-axis components are obtained through the dq-αβ transformation. It is transformed into the grid-side voltage reference value αβ component.
所述的基于MMC整流的阻抗源大功率高速发电机并网系统的控制方法，通过控制器1对机侧进行控制，通过控制器2对网侧进行控制，从而实现大功率高速发电机的高效、可靠并网。In the control method of the MMC rectification-based impedance source high-power high-speed generator grid-connected system, the machine side is controlled by the controller 1, and the grid side is controlled by the controller 2, thereby realizing the high-efficiency of the high-power high-speed generator. , Reliable grid connection.
本发明与现有技术相比的益处在于：The benefit of the present invention compared with prior art is:
(1)由大功率高速发电机、MMC整流器和阻抗源逆变器组成的变流系统，其整流装置和传统三相六开关PWM整流器相比具有更高的耐压能力，且该到功率高速发电机并网系统在阻抗源逆变器直通时，仍能正常工作，和传统拓扑相比具有更高的可靠性和稳定性；(1) A converter system consisting of a high-power high-speed generator, MMC rectifier and impedance source inverter, its rectifier device has a higher withstand voltage than the traditional three-phase six-switch PWM rectifier, and the high-speed power The generator grid-connected system can still work normally when the impedance source inverter is directly connected, and it has higher reliability and stability than the traditional topology;
(2)由于MMC整流器具有更高的等效开关频率，在输入交流频率较高的情况下具有正弦度更高的发电机定子电流谐波；(2) Since the MMC rectifier has a higher equivalent switching frequency, it has higher sinusoidal generator stator current harmonics when the input AC frequency is higher;
(3)由于MMC整流器也具有升压功能，分担了阻抗源逆变器的升压增益，从而降低了阻抗源逆变器的开关电压应力。(3) Since the MMC rectifier also has a boost function, it shares the boost gain of the impedance source inverter, thereby reducing the switching voltage stress of the impedance source inverter.
附图说明Description of drawings
图1为本发明实例提供的基于MMC整流的阻抗源（半准Z源）大功率高速发电机并网系统结构示意图。Fig. 1 is a schematic structural diagram of a high-power high-speed generator grid-connected system based on MMC rectification impedance source (semi-quasi-Z source) provided by the example of the present invention.
图2为本发明实例提供的基于MMC整流的半准Z源大功率高速发电机并网系统的控制框图。Fig. 2 is a control block diagram of a semi-quasi-Z source high-power high-speed generator grid-connected system based on MMC rectification provided by the example of the present invention.
具体实施方式Detailed ways
为了更为具体地描述本发明，下面结合附图和实施例对本发明做进一步说明。应当理解，此处所描述的具体实施例仅用于解释本发明，并不用于限定本发明。In order to describe the present invention more specifically, the present invention will be further illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
如图1所示，一种基于MMC整流的阻抗源（半准Z源）大功率高速发电机并网系统，包括一台大功率高速永磁同步发电机、一台MMC整流器、一台半准Z源逆变器、一台三相滤波电抗器和两套控制器（控制器1和控制器2），两套控制器分别对MMC整流器和半准Z源逆变器进行控制。其中：As shown in Figure 1, a high-power and high-speed generator grid-connected system based on MMC rectification impedance source (semi-quasi-Z source) includes a high-power high-speed permanent magnet synchronous generator, an MMC rectifier, and a semi-quasi-Z Source inverter, a three-phase filter reactor and two sets of controllers (controller 1 and controller 2), the two sets of controllers control the MMC rectifier and semi-quasi-Z source inverter respectively. in:
MMC整流器由三3个桥臂并联组成，每一个桥臂由2n个子模块串联组成，每个子模块由两个IGBT串联后再并联一个电容构成；半准Z源逆变器由电感、电容、二极管构成的半准Z源网络和三个3个IGBT半桥电路并联组成；并网滤波电抗器由3个交流电感构成。The MMC rectifier is composed of three bridge arms connected in parallel, each bridge arm is composed of 2n sub-modules in series, and each sub-module is composed of two IGBTs connected in series and then connected in parallel with a capacitor; the semi-quasi-Z source inverter is composed of inductors, capacitors, diodes The composed semi-quasi-Z source network and three 3 IGBT half-bridge circuits are connected in parallel; the grid-connected filter reactor is composed of 3 AC inductors.
大功率高速永磁同步发电机的三相定子分别与MMC整流器三个桥臂的中点相连；MMC整流器的公共直流侧与半准Z源逆变器的输入端并联；半准Z源逆变器三相输出端接滤波电抗器后并入电网。The three-phase stator of the high-power high-speed permanent magnet synchronous generator is respectively connected to the midpoint of the three bridge arms of the MMC rectifier; the common DC side of the MMC rectifier is connected in parallel with the input terminal of the semi-quasi-Z source inverter; the semi-quasi-Z source inverter The three-phase output terminal of the transformer is connected to the power grid after being connected with a filter reactor.
控制器1用于采集大功率高速永磁同步发电机的转速、转子位置角和三相定子电流，随后通过脉冲触发信号对发电机的转速和MMC整流器输入功率因数进行控制；所述控制器2用于采集半准Z源网络电容的端电压、半准Z源逆变器三相并网电压和半准Z源逆变器三相并网电流，随后通过直通控制策略构造出带直通零矢量的PWM脉冲信号，对半准Z源网络电容电压和并网功率因数进行控制。The controller 1 is used to collect the rotational speed, the rotor position angle and the three-phase stator current of the high-power high-speed permanent magnet synchronous generator, and then control the rotational speed of the generator and the input power factor of the MMC rectifier through the pulse trigger signal; the controller 2 It is used to collect the terminal voltage of the semi-quasi-Z source network capacitor, the three-phase grid-connected voltage of the semi-quasi-Z source inverter and the three-phase grid-connected current of the semi-quasi-Z source inverter, and then construct a through-zero vector through the through-through control strategy The PWM pulse signal is used to control the semi-quasi-Z source network capacitor voltage and grid-connected power factor.
本实施方式基于MMC整流的半准Z源大功率高速发电机并网系统的控制框图如图2所示，控制方法包括如下步骤：In this embodiment, the control block diagram of the semi-quasi-Z source high-power high-speed generator grid-connected system based on MMC rectification is shown in Figure 2. The control method includes the following steps:
(1) 实时检测大功率高速永磁同步发电机的转速ω r 、转子位置角Ө r 和高速发电机的三相定子电流；(1) Real-time detection of the speed ω r of the high-power high-speed permanent magnet synchronous generator, the rotor position angle Ө r and the three-phase stator current of the high-speed generator;
(2) 利用所述的转子位置角Ө r 对高速发电机的三相定子电流进行dq变换，得到三相定子电流的dq轴分量；(2) Utilize described rotor position angle Ө r to carry out dq conversion to the three-phase stator current of high-speed generator, obtain the dq axis component of three-phase stator current;
(3) 通过机侧双闭环控制方法对高速发电机转速、发电机定子电流的dq轴分量进行比较计算，得到机侧电压参考值αβ分量；机侧双闭环控制以高速发电机的转速稳定和定子电流谐波小为控制目标；机侧电压参考值αβ分量具体由如下方法获得：将高速发电机转速的参考值和检测值进行比较，通过PI调节器后得到高速发电机q轴电流参考值，给定高速发电机d轴电流参考值为0，将高速发电机定子dq轴电流参考值和检测值进行比较后，通过PI调节器得到调制所需的电压给定dq轴分量，再通过dq-αβ变换将其转化为机侧电压参考值αβ分量；(3) Comparing and calculating the high-speed generator speed and the dq axis components of the generator stator current through the machine-side double closed-loop control method to obtain the machine-side voltage reference value αβ component; the machine-side double closed-loop control stabilizes the speed of the high-speed generator and The stator current harmonic is small as the control target; the αβ component of the machine-side voltage reference value is specifically obtained by the following method: compare the reference value of the high-speed generator speed with the detected value, and obtain the q- axis current reference value of the high-speed generator through the PI regulator , given that the d- axis current reference value of the high-speed generator is 0, after comparing the high-speed generator stator dq -axis current reference value with the detected value, the voltage required for modulation is obtained through the PI regulator to give the dq- axis components, and then through the dq - αβ transformation converts it into the αβ component of the machine-side voltage reference value;
(4) 实时检测半准Z源逆变器三相并网线电压和相电流，进而估算出相角Ө；(4) Real-time detection of semi-quasi-Z source inverter three-phase grid-connected line voltage and phase current, and then estimate the phase angle Ө ;
(5) 利用所述的相角Ө对半准Z源逆变器三相并网电压和三相并网电流进行dq变换，得到三相并网电压的dq轴分量和三相并网电流的dq轴分量；(5) Use the phase angle Ө to perform dq transformation on the three-phase grid-connected voltage and three-phase grid-connected current of the semi-quasi-Z source inverter, and obtain the dq axis components of the three-phase grid-connected voltage and the three-phase grid-connected current dq axis components;
(6) 实时检测半准Z源网络电容的电压V C1 ；(6) Real-time detection of the voltage V C1 of the semi-quasi-Z source network capacitance;
(7) 通过网侧双闭环控制方法对半准Z源逆变器三相并网电压、并网电流的dq轴分量、相角Ө和半准Z网络电容电压V C1 进行比较计算，得到网侧电压参考值αβ分量；网侧双闭环控制方法以半准Z源网络电容电压稳定和单位功率因数并网为控制目标；网侧电压参考值αβ分量具体由如下方法获得：将半准Z源网络电容电压的参考值和检测值进行比较，通过PI调节器后得到并网电流d轴参考值，给定并网电流q轴参考值为0，将并网电流dq轴参考值和检测值进行比较后，通过PI调节器得到调制所需的电压给定dq轴分量，再通过dq-αβ变换将其转化为网侧电压参考值αβ分量；(7) Comparing and calculating the three-phase grid-connected voltage of the semi-quasi-Z source inverter, the dq -axis component of the grid-connected current, the phase angle Ө , and the semi-quasi-Z network capacitor voltage V C1 through the grid-side double closed-loop control method, and the network is obtained The side voltage reference value αβ component; the grid side double closed-loop control method takes the semi-quasi-Z source network capacitor voltage stability and unit power factor grid connection as the control objectives; the grid-side voltage reference value αβ component is specifically obtained by the following method: the semi-quasi-Z source The reference value of the network capacitor voltage is compared with the detection value, and the d- axis reference value of the grid-connected current is obtained after passing through the PI regulator. The q-axis reference value of the grid-connected current is given as 0, and the dq- axis reference value and the detection value of the grid-connected current are compared. After the comparison, the voltage given dq axis components required for modulation are obtained through the PI regulator, and then converted into grid-side voltage reference value αβ components through dq-αβ transformation;
(8) 将直通占空比d 0 和(7)中得到的电压参考值αβ分量输入带直通零矢量的空间矢量脉冲宽度调制控制器，得到半准Z源逆变器并网的控制脉冲信号。(8) Input the through-duty cycle d 0 and the voltage reference value αβ component obtained in (7) into the space vector pulse width modulation controller with a through-zero vector to obtain the control pulse signal of the semi-quasi-Z source inverter connected to the grid .
该实例仅为本发明的一个实例，而非全部实例，凡在本发明思路和原则下的修改、改进方案均属于本发明的保护范围。This example is only an example of the present invention, not all examples, and all modifications and improvements based on the idea and principle of the present invention belong to the protection scope of the present invention.
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