CN113162045A - Inverter control method and device containing nonlinear load island microgrid harmonic suppression - Google Patents

Inverter control method and device containing nonlinear load island microgrid harmonic suppression Download PDF

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CN113162045A
CN113162045A CN202110251648.6A CN202110251648A CN113162045A CN 113162045 A CN113162045 A CN 113162045A CN 202110251648 A CN202110251648 A CN 202110251648A CN 113162045 A CN113162045 A CN 113162045A
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陈强
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Abstract

本发明公开了一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法及装置。采用基波和谐波分量解耦控制得到逆变器电压外环参考值的基波和谐波分量。基波域采用虚拟同步电机控制，谐波域采用自适应谐波补偿和谐波虚拟阻抗相结合的控制方式，使逆变器输出谐波电流能根据逆变器容量进行自主分配以抑制谐波环流，并实现对PCC电压谐波分量的抑制。

Figure 202110251648

The invention discloses an inverter control method and device for harmonic suppression of an islanded microgrid with nonlinear load. The fundamental and harmonic components of the reference value of the inverter voltage outer loop are obtained by decoupling control of the fundamental and harmonic components. The fundamental wave domain adopts virtual synchronous motor control, and the harmonic domain adopts the control method combining adaptive harmonic compensation and harmonic virtual impedance, so that the output harmonic current of the inverter can be autonomously distributed according to the inverter capacity to suppress harmonics. Circulating current, and realizing the suppression of the harmonic components of the PCC voltage.

Figure 202110251648

Description

含非线性负荷孤岛微电网谐波抑制的逆变器控制方法及装置Inverter control method and device for harmonic suppression of islanded microgrid with nonlinear load

技术领域technical field

本发明属于电力电子技术领域，具体涉及一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，还涉及一种含非线性负荷孤岛微电网谐波抑制的逆变器控制装置。The invention belongs to the technical field of power electronics, and in particular relates to an inverter control method for harmonic suppression of an islanded microgrid with nonlinear load, and an inverter control device for harmonic suppression of an islanded microgrid with nonlinear load.

背景技术Background technique

随着传统能源日益紧张和环境问题的加剧，光伏、风电、燃料电池等分布式发电得到快速发展，由分布式发电、储能和本地负荷等组成的微电网得到越来越广泛地应用。微电网中往往含有非线性负荷，离网孤岛运行时易导致逆变器间谐波环流和微电网PCC(电网公共点)电压谐波畸变。谐波环流会影响逆变器的稳定运行甚至损坏，需要对逆变器间输出谐波电流进行分配以抑制环流。国家标准和IEEE标准均规定电网电压总谐波失真率(THD)不得大于5％，当微电网PCC电压谐波严重时，会影响微电网内电气设备的正常工作，因此要对非线性负荷引起的PCC电压谐波分量进行抑制，保证微电网电能质量。With the increasing shortage of traditional energy sources and the aggravation of environmental problems, distributed power generation such as photovoltaics, wind power, and fuel cells have developed rapidly, and microgrids composed of distributed power generation, energy storage, and local loads have been more and more widely used. Microgrids often contain nonlinear loads, and off-grid island operation can easily lead to inter-inverter harmonic circulation and microgrid PCC (power grid common point) voltage harmonic distortion. Harmonic circulating current will affect the stable operation of the inverter or even damage it. It is necessary to distribute the output harmonic current among the inverters to suppress the circulating current. Both the national standard and the IEEE standard stipulate that the total harmonic distortion (THD) of the grid voltage should not be greater than 5%. When the PCC voltage harmonics of the microgrid are serious, it will affect the normal operation of the electrical equipment in the microgrid. The PCC voltage harmonic components are suppressed to ensure the power quality of the microgrid.

将有源电力滤波器应用于微电网能有效抑制谐波，但这会增加微电网系统成本。逆变器自身实现孤岛微电网谐波抑制的控制策略主要分为无通信线的分散式自主控制和基于通信线的分层控制两种模式。逆变器间谐波环流和输出电压畸变受逆变器输出阻抗和馈线阻抗的影响，无互联通信线自主控制多采用虚拟阻抗实现环流抑制，但虚拟阻抗偏小易受馈线阻抗影响环流抑制，虚拟阻抗偏大则易导致PCC电压畸变加大。基于通信线的分层控制能够有效减少馈线阻抗对电流分配的影响和抑制微电网PCC电压谐波畸变。但基于通信线的分层控制会增加微电网系统硬件复杂度，降低可靠性，且不利于并联逆变器的增加以便于微电网扩容。Applying active power filter to microgrid can effectively suppress harmonics, but it will increase the cost of microgrid system. The control strategies of the inverter itself to realize the harmonic suppression of the islanded microgrid are mainly divided into two modes: distributed autonomous control without communication line and layered control based on communication line. The inter-inverter harmonic circulating current and output voltage distortion are affected by the output impedance of the inverter and the impedance of the feeder. The autonomous control of the unconnected communication line mostly uses virtual impedance to suppress the circulating current, but the virtual impedance is too small and is easily affected by the impedance of the feeder. If the virtual impedance is too large, it is easy to increase the PCC voltage distortion. The layered control based on the communication line can effectively reduce the influence of the feeder impedance on the current distribution and suppress the PCC voltage harmonic distortion in the microgrid. However, the layered control based on the communication line will increase the hardware complexity of the microgrid system, reduce the reliability, and is not conducive to the increase of parallel inverters to facilitate the expansion of the microgrid.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于克服现有技术中的不足，提供了一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，对基波和谐波分量进行分离解耦控制得到逆变器电压外环参考电压的基波和谐波分量，满足基波和谐波分量的不同控制需求，谐波域采用自适应谐波补偿和谐波虚拟阻抗相结合，实现微电网PCC电压谐波分量和逆变器谐波环流的抑制。The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide an inverter control method for the harmonic suppression of an islanded microgrid with nonlinear loads. The fundamental wave and harmonic components are separated and decoupled to obtain an inverter. The fundamental wave and harmonic components of the reference voltage in the outer voltage loop meet the different control requirements of the fundamental wave and harmonic components. The harmonic domain adopts the combination of adaptive harmonic compensation and harmonic virtual impedance to realize the harmonic components of the PCC voltage of the microgrid. and the suppression of inverter harmonic circulating current.

为解决上述技术问题，本发明提供了一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，包括以下过程：In order to solve the above technical problems, the present invention provides an inverter control method for harmonic suppression of an islanded microgrid with nonlinear loads, including the following processes:

采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量；Collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the fundamental wave and harmonics of the collected voltage and current to obtain the corresponding fundamental wave and harmonic components;

基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量；Based on the obtained fundamental components of the output voltage and output current of the inverter, the instantaneous active and reactive power of the fundamental-wave domain inverter are calculated. The fundamental component of the outer loop reference voltage;

基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量；Based on the obtained harmonic components of the PCC voltage and inverter output current, an adaptive harmonic compensation loop and a combination of harmonic virtual impedance are introduced to obtain the harmonic components of the reference voltage of the outer voltage loop;

基于获得的电压外环参考电压的基波和谐波分量，计算得到电压外环参考电压，针对电压外环参考电压，采用逆变器电压外环电流内环双环控制，得到逆变器三相逆变桥的控制电压。Based on the obtained fundamental wave and harmonic components of the voltage outer loop reference voltage, the voltage outer loop reference voltage is calculated. For the voltage outer loop reference voltage, the inverter voltage outer loop current inner loop double-loop control is used to obtain the three-phase inverter. Control voltage of the inverter bridge.

可选的，所述基波和谐波分离是通过带通滤波器实现的。Optionally, the fundamental and harmonic separation is achieved by a bandpass filter.

可选的，所述基波和谐波分离的计算公式为：Optionally, the calculation formula of the fundamental wave and harmonic separation is:

逆变器输出电流io的基波和谐波分量计算公式为：The formula for calculating the fundamental and harmonic components of the inverter output current i o is:

Figure BDA0002966311910000031
Figure BDA0002966311910000031

其中，

Figure BDA0002966311910000032
和
Figure BDA0002966311910000033
为逆变器输出电流io的基波和谐波分量，ζ为带通滤波器阻尼系数，ω为逆变器基波电角速度实际值。in,
Figure BDA0002966311910000032
and
Figure BDA0002966311910000033
are the fundamental and harmonic components of the inverter output current i o , ζ is the damping coefficient of the band-pass filter, and ω is the actual value of the fundamental electrical angular velocity of the inverter.

可选的，所述基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，包括：Optionally, based on the obtained fundamental wave components of the inverter output voltage and output current, the instantaneous active power and reactive power of the fundamental wave domain inverter are calculated and obtained, including:

基于得到的逆变器输出电压uo和输出电流io的基波分量，计算VSG控制所采用的基波域逆变器瞬时有功Pf和无功Qf，公式为：Based on the obtained fundamental components of the inverter output voltage u o and output current i o , the instantaneous active power P f and reactive power Q f of the fundamental-wave domain inverter used in VSG control are calculated, and the formulas are:

Figure BDA0002966311910000034
Figure BDA0002966311910000034

式中，

Figure BDA0002966311910000035
为逆变器输出电压基波分量
Figure BDA0002966311910000036
的dq分量，
Figure BDA0002966311910000037
为逆变器输出电流基波分量
Figure BDA0002966311910000038
的dq分量。In the formula,
Figure BDA0002966311910000035
is the fundamental component of the inverter output voltage
Figure BDA0002966311910000036
The dq component of ,
Figure BDA0002966311910000037
The fundamental component of the output current for the inverter
Figure BDA0002966311910000038
dq component of .

可选的，所述对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量，包括：Optionally, the virtual synchronous motor is used to control the instantaneous active and reactive power of the fundamental-wave domain inverter to obtain the fundamental-wave component of the reference voltage in the outer voltage loop, including:

VSG控制方程为：The VSG control equation is:

Figure BDA0002966311910000039
Figure BDA0002966311910000039

式中，P0为逆变器额定有功，kω为有功下垂系数，ω为逆变器电角速度实际值，Pref为逆变器给定参考有功，ω0为逆变器额定电角速度，J为转动惯量，D为VSG控制阻尼系数，U0为逆变器额定电压幅值，nQ为无功下垂系数，Q0为逆变器额定无功，Uref为逆变器给定参考电压幅值；ku为PCC电压调节系数；In the formula, P 0 is the rated active power of the inverter, k ω is the active power droop coefficient, ω is the actual value of the electrical angular velocity of the inverter, P ref is the given reference active power of the inverter, ω 0 is the rated electrical angular velocity of the inverter, J is the moment of inertia, D is the VSG control damping coefficient, U 0 is the rated voltage amplitude of the inverter, n Q is the reactive power droop coefficient, Q0 is the rated reactive power of the inverter, and U ref is the given reference voltage of the inverter Amplitude; ku is the PCC voltage regulation coefficient;

根据式(5)可得VSG给定的基波域电压参考值为：According to formula (5), the reference value of fundamental wave domain voltage given by VSG can be obtained:

Figure BDA0002966311910000041
Figure BDA0002966311910000041

式中，θ为逆变器相角，

Figure BDA0002966311910000042
t表示时间，
Figure BDA0002966311910000043
为逆变器初始相角；where θ is the inverter phase angle,
Figure BDA0002966311910000042
t represents time,
Figure BDA0002966311910000043
is the initial phase angle of the inverter;

进一步引入基波域虚拟阻抗

Figure BDA0002966311910000044
得到电压外环参考电压uref的基波分量
Figure BDA0002966311910000045
为：Further introduction of fundamental domain virtual impedance
Figure BDA0002966311910000044
Obtain the fundamental component of the voltage outer loop reference voltage u ref
Figure BDA0002966311910000045
for:

Figure BDA0002966311910000046
Figure BDA0002966311910000046

其中，基波域虚拟阻抗

Figure BDA0002966311910000047
Figure BDA0002966311910000048
为
Figure BDA0002966311910000049
的电阻部分，
Figure BDA00029663119100000410
为
Figure BDA00029663119100000411
的电感部分。Among them, the virtual impedance of the fundamental wave domain
Figure BDA0002966311910000047
Figure BDA0002966311910000048
for
Figure BDA0002966311910000049
the resistor part,
Figure BDA00029663119100000410
for
Figure BDA00029663119100000411
the inductive part.

可选的，所述基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量，包括：Optionally, based on the obtained PCC voltage and the harmonic components of the inverter output current, an adaptive harmonic compensation loop and a harmonic virtual impedance are introduced to combine to obtain the harmonic components of the reference voltage of the outer voltage loop, including:

基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环，得到自适应谐波补偿环得到的补偿量；Based on the obtained harmonic components of PCC voltage and inverter output current, an adaptive harmonic compensation loop is introduced to obtain the compensation amount obtained by the adaptive harmonic compensation loop;

基于自适应谐波补偿环得到的补偿量和逆变器输出电流的谐波分量，引入谐波虚拟阻抗相结合，得到电压外环参考电压谐波分量。Based on the compensation amount obtained by the adaptive harmonic compensation loop and the harmonic components of the inverter output current, the harmonic components of the reference voltage of the outer voltage loop are obtained by introducing the combination of the harmonic virtual impedance.

可选的，所述基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量，包括：Optionally, based on the obtained PCC voltage and the harmonic components of the inverter output current, an adaptive harmonic compensation loop and a harmonic virtual impedance are introduced to combine to obtain the harmonic components of the reference voltage of the outer voltage loop, including:

电压外环参考电压谐波分量中引入自适应谐波补偿环，则自适应谐波补偿环得到的补偿量Uh表达为：An adaptive harmonic compensation loop is introduced into the reference voltage harmonic component of the voltage outer loop, and the compensation amount U h obtained by the adaptive harmonic compensation loop is expressed as:

Figure BDA0002966311910000051
Figure BDA0002966311910000051

式中，kh为谐波补偿系数，

Figure BDA0002966311910000052
kih为自适应谐波补偿系数，
Figure BDA0002966311910000053
为PCC电压upcc的谐波分量；where k h is the harmonic compensation coefficient,
Figure BDA0002966311910000052
k ih is the adaptive harmonic compensation coefficient,
Figure BDA0002966311910000053
is the harmonic component of the PCC voltage u pcc ;

引入谐波域虚拟阻抗，电压外环参考电压uref谐波分量

Figure BDA0002966311910000054
为：Introducing the virtual impedance in the harmonic domain, the voltage outer loop reference voltage u ref harmonic components
Figure BDA0002966311910000054
for:

Figure BDA0002966311910000055
Figure BDA0002966311910000055

式中，

Figure BDA0002966311910000056
为谐波域虚拟阻抗。In the formula,
Figure BDA0002966311910000056
is the virtual impedance in the harmonic domain.

可选的，所述自适应谐波补偿系数kih的取值范围为：Optionally, the value range of the adaptive harmonic compensation coefficient k ih is:

自适应谐波补偿系数要满足以下要求：The adaptive harmonic compensation coefficient must meet the following requirements:

Figure BDA0002966311910000057
Figure BDA0002966311910000057

其中，U0为逆变器额定电压幅值，I0为逆变器额定电流值。Among them, U 0 is the rated voltage amplitude of the inverter, and I 0 is the rated current value of the inverter.

可选的，所述自适应谐波补偿系数和谐波虚拟阻抗还需满足：Optionally, the adaptive harmonic compensation coefficient and harmonic virtual impedance also need to satisfy:

多个逆变器之间，逆变器额定功率、自适应补偿系数和谐波虚拟阻抗之间的关系为：Among multiple inverters, the relationship between inverter rated power, adaptive compensation coefficient and harmonic virtual impedance is:

Figure BDA0002966311910000058
Figure BDA0002966311910000058

式中，Sn为第n台逆变器的额定功率，

Figure BDA0002966311910000059
为第n台逆变器的谐波虚拟阻抗，kihn为第n台逆变器的自适应补偿系数。where Sn is the rated power of the nth inverter,
Figure BDA0002966311910000059
is the harmonic virtual impedance of the nth inverter, and k ihn is the adaptive compensation coefficient of the nth inverter.

相应的，本发明还提供了一种含非线性负荷孤岛微电网谐波抑制的逆变器控制装置，包括：Correspondingly, the present invention also provides an inverter control device for harmonic suppression of a non-linear load islanded microgrid, including:

基波谐波分离模块，用于采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量；The fundamental wave harmonic separation module is used to collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the fundamental wave and harmonics of the collected voltage and current to obtain the corresponding fundamental wave and harmonic components;

基波分量计算模块，用于基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量；The fundamental wave component calculation module is used to calculate the instantaneous active and reactive power of the fundamental wave domain inverter based on the obtained fundamental wave components of the inverter output voltage and output current. Using virtual synchronous motor control, the fundamental component of the reference voltage of the outer voltage loop is obtained;

谐波分量计算模块，用于基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量；The harmonic component calculation module is used to introduce an adaptive harmonic compensation loop and a combination of harmonic virtual impedance based on the obtained PCC voltage and the harmonic component of the inverter output current to obtain the harmonic component of the reference voltage of the outer voltage loop;

控制电压计算模块，用于基于获得的电压外环参考电压的基波和谐波分量，计算得到电压外环参考电压，针对电压外环参考电压，采用逆变器电压外环电流内环双环控制，得到逆变器三相逆变桥的控制电压。The control voltage calculation module is used to calculate the reference voltage of the outer voltage loop based on the fundamental wave and harmonic components of the obtained reference voltage of the outer loop of the voltage. For the reference voltage of the outer voltage loop, the inverter voltage outer loop current inner loop double-loop control is adopted. , the control voltage of the inverter three-phase inverter bridge is obtained.

与现有技术相比，本发明所达到的有益效果是：本发明根据孤岛微电网逆变器基波和谐波分量不同控制需求，对基波和谐波分量进行分离解耦控制。针对非线性负荷导致的孤岛微电网PCC电压谐波畸变以及各逆变器阻抗与容量不匹配导致的谐波环流，谐波域采用自适应谐波补偿和谐波虚拟阻抗相结合对谐波分量进行控制。本发明所提供的控制方法简单易行，能实现含非线性负荷孤岛微电网谐波抑制，易于工程化。Compared with the prior art, the beneficial effects achieved by the present invention are: the present invention performs separation and decoupling control on the fundamental wave and harmonic components according to the different control requirements of the fundamental wave and harmonic components of the islanded microgrid inverter. Aiming at the harmonic distortion of the PCC voltage of the islanded microgrid caused by the nonlinear load and the harmonic circulation caused by the mismatch between the impedance and the capacity of each inverter, the harmonic domain adopts the combination of adaptive harmonic compensation and harmonic virtual impedance to control the harmonic components. Take control. The control method provided by the invention is simple and feasible, can realize the harmonic suppression of the island microgrid with nonlinear load, and is easy to be engineered.

附图说明Description of drawings

图1是含非线性负荷孤岛微电网主电路及控制系统图；Figure 1 is a diagram of the main circuit and control system of an islanded microgrid with nonlinear loads;

图2是基波和谐波分量分离原理示意图；Figure 2 is a schematic diagram of the separation principle of the fundamental wave and harmonic components;

图3是VSG控制系统框图；Figure 3 is a block diagram of the VSG control system;

图4是自适应谐波补偿控制系统框图；Figure 4 is a block diagram of an adaptive harmonic compensation control system;

图5是电压外环电流内环双环控制框图；Figure 5 is a block diagram of the voltage outer loop and the current inner loop double-loop control;

图6是实施例中非线性负荷孤岛微电网系统图；Fig. 6 is the non-linear load island microgrid system diagram in the embodiment;

图7是实施例中微电网PCC电压的谐波含量；Fig. 7 is the harmonic content of microgrid PCC voltage in the embodiment;

图8是实施例中两个逆变器输出电流波形图。FIG. 8 is a waveform diagram of output currents of two inverters in the embodiment.

具体实施方式Detailed ways

下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

实施例1Example 1

含非线性负荷孤岛微电网主电路及控制系统图如图1所示，对于每个逆变器，Udc为逆变器直流侧电压，L、C分别为逆变器滤波电感、电容，电容C的端电压为逆变器输出电压uo，Zl为逆变器与微电网PCC之间的馈线阻抗。为了对含非线性负荷孤岛微电网谐波抑制，控制系统对每个逆变器执行相同策略，根据采样值计算得到三相桥电路的输出，通过SVPWM得到驱动信号驱动三相桥电路中各IGBT开关，达到控制目的。The main circuit and control system diagram of the islanded microgrid with nonlinear load is shown in Figure 1. For each inverter, U dc is the DC side voltage of the inverter, and L and C are the inverter filter inductance, capacitance, and capacitance, respectively. The terminal voltage of C is the inverter output voltage u o , and Z l is the feeder impedance between the inverter and the microgrid PCC. In order to suppress the harmonics of the islanded microgrid with nonlinear load, the control system implements the same strategy for each inverter, calculates the output of the three-phase bridge circuit according to the sampling value, and obtains the drive signal through SVPWM to drive each IGBT in the three-phase bridge circuit. switch to achieve the control purpose.

本发明的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，包括以下步骤：An inverter control method for harmonic suppression of an islanded microgrid with nonlinear load of the present invention includes the following steps:

步骤一：采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量。Step 1: Collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the collected voltage and current from the fundamental wave and the harmonic wave respectively to obtain the corresponding fundamental wave and harmonic components.

根据孤岛微电网逆变器基波和谐波分量不同控制需求，对基波和谐波分量进行分离解耦控制。本发明实施例中，逆变器输出电流io的基波和谐波分离采用带通滤波器实现，图2为基波和谐波分离方法的原理示意图，如图2所示，ζ为带通滤波器阻尼系数，ω为逆变器电角速度实际值(由于此逆变器控制模拟同步发电机所以用电角速度表示)，

Figure BDA0002966311910000071
和
Figure BDA0002966311910000072
为逆变器输出电流io的基波和谐波分量，文中物理量的基波分量均上标f，文中物理量的谐波分量均上标h。According to the different control requirements of the fundamental wave and harmonic components of the islanded microgrid inverter, the separation and decoupling control of the fundamental wave and harmonic components is carried out. In the embodiment of the present invention, the fundamental wave and harmonic separation of the inverter output current i o are realized by using a band-pass filter. FIG. 2 is a schematic diagram of the principle of the fundamental wave and harmonic separation method. The damping coefficient of the pass filter, ω is the actual value of the electrical angular velocity of the inverter (represented by the electrical angular velocity because the inverter controls the simulated synchronous generator),
Figure BDA0002966311910000071
and
Figure BDA0002966311910000072
are the fundamental wave and harmonic components of the inverter output current i o , the fundamental wave components of the physical quantities in the text are all superscript f, and the harmonic components of the physical quantities in the text are all superscript h.

逆变器输出电流io的基波和谐波分量计算公式为：The formula for calculating the fundamental and harmonic components of the inverter output current i o is:

Figure BDA0002966311910000081
Figure BDA0002966311910000081

电压的基波和谐波分量分离同理可得，

Figure BDA0002966311910000082
和
Figure BDA0002966311910000083
为逆变器输出电压uo的基波和谐波分量，
Figure BDA0002966311910000084
和
Figure BDA0002966311910000085
为PCC电压upcc的基波和谐波分量。The fundamental and harmonic components of the voltage can be separated in the same way,
Figure BDA0002966311910000082
and
Figure BDA0002966311910000083
are the fundamental and harmonic components of the inverter output voltage u o ,
Figure BDA0002966311910000084
and
Figure BDA0002966311910000085
are the fundamental and harmonic components of the PCC voltage u pcc .

Figure BDA0002966311910000086
Figure BDA0002966311910000086

Figure BDA0002966311910000087
Figure BDA0002966311910000087

传统控制的逆变器基波域和谐波域输出阻抗相同，难以满足基波和谐波分量的不同控制需求，非线性负荷下的控制效果也难以理想。本发明采用基波域和谐波域的解耦控制分别得到电压外环参考值的基波和谐波分量，改进输出特性，提高非线性负荷下孤岛微电网稳定运行能力。The output impedance of the inverter in the fundamental and harmonic domains of traditional control is the same, so it is difficult to meet the different control requirements of the fundamental and harmonic components, and the control effect under nonlinear loads is also difficult to achieve. The invention adopts the decoupling control of the fundamental wave domain and the harmonic domain to obtain the fundamental wave and harmonic components of the reference value of the voltage outer loop respectively, so as to improve the output characteristics and improve the stable operation capability of the island microgrid under nonlinear load.

步骤二：基波域：基于得到的逆变器输出电压uo和输出电流io的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机(VSG)控制，得到基波域电压参考值，基于基波域电压参考值和逆变器输出电流的基波分量，引入基波域虚拟阻抗，得到电压外环参考电压的基波分量。Step 2: Fundamental wave domain: Based on the obtained fundamental wave components of the inverter output voltage u o and output current i o , the instantaneous active and reactive power of the fundamental wave domain inverter are calculated, and the instantaneous active power of the fundamental wave domain inverter is calculated. And reactive power is controlled by virtual synchronous motor (VSG), and the voltage reference value in the fundamental wave domain is obtained. Based on the voltage reference value in the fundamental wave domain and the fundamental wave component of the inverter output current, the virtual impedance in the fundamental wave domain is introduced to obtain the voltage outer loop reference. The fundamental component of the voltage.

为提高基波域下垂控制的稳定性，采用VSG控制得到电压外环参考电压的基波分量

Figure BDA0002966311910000088
模拟同步发电机转子运动和定子励磁调节特性使逆变器具备类似同步发电机的调频调压特性。图3为VSG控制系统框图，VSG控制策略如下：In order to improve the stability of the droop control in the fundamental wave domain, the fundamental wave component of the voltage outer loop reference voltage is obtained by using VSG control.
Figure BDA0002966311910000088
Simulating the rotor motion and stator excitation regulation characteristics of the synchronous generator enables the inverter to have the frequency and voltage regulation characteristics similar to that of the synchronous generator. Figure 3 is a block diagram of the VSG control system. The VSG control strategy is as follows:

根据解耦控制原则，基于步骤一得到的逆变器输出电压uo和输出电流io的基波分量，计算VSG控制所采用的基波域逆变器瞬时有功Pf和无功Qf，公式为：According to the principle of decoupling control, based on the fundamental components of the inverter output voltage u o and output current i o obtained in step 1, calculate the instantaneous active power P f and reactive power Q f of the fundamental-wave domain inverter used in VSG control, The formula is:

Figure BDA0002966311910000091
Figure BDA0002966311910000091

式中，

Figure BDA0002966311910000092
为逆变器输出电压基波分量
Figure BDA0002966311910000093
的dq分量，
Figure BDA0002966311910000094
为逆变器输出电流基波分量
Figure BDA0002966311910000095
的dq分量。In the formula,
Figure BDA0002966311910000092
is the fundamental component of the inverter output voltage
Figure BDA0002966311910000093
The dq component of ,
Figure BDA0002966311910000094
The fundamental component of the output current for the inverter
Figure BDA0002966311910000095
dq component of .

模拟同步电机的一次调频特性、转子运动方程和定子励磁调节特性，得VSG控制方程为：By simulating the primary frequency modulation characteristics, rotor motion equation and stator excitation regulation characteristics of the synchronous motor, the VSG control equation is obtained as:

Figure BDA0002966311910000096
Figure BDA0002966311910000096

式中，P0为逆变器额定有功，kω为有功下垂系数，ω为逆变器电角速度实际值，Pref为逆变器给定参考有功，ω0为逆变器额定电角速度，J为转动惯量，D为VSG控制阻尼系数，U0为逆变器额定电压幅值，nQ为无功下垂系数，Q0为逆变器额定无功，Uref为逆变器给定参考电压幅值，ku为PCC电压调节系数。In the formula, P 0 is the rated active power of the inverter, k ω is the active power droop coefficient, ω is the actual value of the electrical angular velocity of the inverter, P ref is the given reference active power of the inverter, ω 0 is the rated electrical angular velocity of the inverter, J is the moment of inertia, D is the VSG control damping coefficient, U 0 is the rated voltage amplitude of the inverter, n Q is the reactive power droop coefficient, Q 0 is the rated reactive power of the inverter, and U ref is the inverter given reference Voltage amplitude, ku is the PCC voltage regulation coefficient.

根据式(5)可得VSG给定的基波域电压参考值

Figure BDA0002966311910000097
为：According to formula (5), the reference value of fundamental wave domain voltage given by VSG can be obtained
Figure BDA0002966311910000097
for:

Figure BDA0002966311910000098
Figure BDA0002966311910000098

式中，θ为逆变器相角，

Figure BDA0002966311910000099
t表示时间，
Figure BDA00029663119100000910
为逆变器初始相角。where θ is the inverter phase angle,
Figure BDA0002966311910000099
t represents time,
Figure BDA00029663119100000910
is the initial phase angle of the inverter.

为抑制并联逆变器环流、增强系统稳定性，进一步引入基波域虚拟阻抗

Figure BDA00029663119100000911
以改善逆变器输出特性，得到电压外环参考电压uref的基波分量
Figure BDA00029663119100000912
为：In order to suppress the circulating current of the parallel inverters and enhance the system stability, a virtual impedance in the fundamental wave domain is further introduced.
Figure BDA00029663119100000911
In order to improve the output characteristics of the inverter, the fundamental component of the reference voltage u ref in the outer voltage loop can be obtained
Figure BDA00029663119100000912
for:

Figure BDA00029663119100000913
Figure BDA00029663119100000913

其中，基波域虚拟阻抗

Figure BDA0002966311910000101
Figure BDA0002966311910000102
为
Figure BDA0002966311910000103
的电阻部分，
Figure BDA0002966311910000104
为
Figure BDA0002966311910000105
的电感部分。为改善逆变器的下垂特性，基波域输出阻抗需呈强感性。Among them, the virtual impedance of the fundamental wave domain
Figure BDA0002966311910000101
Figure BDA0002966311910000102
for
Figure BDA0002966311910000103
the resistor part,
Figure BDA0002966311910000104
for
Figure BDA0002966311910000105
the inductive part. In order to improve the droop characteristic of the inverter, the output impedance of the fundamental wave domain needs to be strongly inductive.

步骤三：谐波域：基于PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压谐波分量

Figure BDA0002966311910000106
Step 3: Harmonic Domain: Based on the harmonic components of the PCC voltage and inverter output current, an adaptive harmonic compensation loop and a combination of harmonic virtual impedance are introduced to obtain the reference voltage harmonic components of the outer voltage loop
Figure BDA0002966311910000106

非线性负荷导致的孤岛微电网PCC电压谐波畸变以及各逆变器阻抗与容量不匹配导致的谐波环流，谐波域采用自适应谐波补偿和谐波虚拟阻抗相结合对谐波分量进行控制，谐波虚拟阻抗能有效实现谐波电流分配，自适应谐波补偿环能有效抑制PCC电压谐波畸变以消除谐波虚拟阻抗对PCC电能质量的影响。实现微电网PCC电压谐波分量和逆变器谐波环流的抑制。The harmonic distortion of the PCC voltage of the islanded microgrid caused by the nonlinear load and the harmonic circulation caused by the mismatch between the impedance and capacity of each inverter. The harmonic domain adopts the combination of adaptive harmonic compensation and harmonic virtual impedance to analyze the harmonic components. Control, the harmonic virtual impedance can effectively realize the harmonic current distribution, and the adaptive harmonic compensation loop can effectively suppress the harmonic distortion of the PCC voltage to eliminate the influence of the harmonic virtual impedance on the power quality of the PCC. Realize the suppression of the PCC voltage harmonic components of the microgrid and the harmonic circulating current of the inverter.

电压外环参考电压谐波分量中引入自适应谐波补偿环，则自适应谐波补偿环得到的补偿量Uh表达为：An adaptive harmonic compensation loop is introduced into the reference voltage harmonic component of the voltage outer loop, and the compensation amount U h obtained by the adaptive harmonic compensation loop is expressed as:

Figure BDA0002966311910000107
Figure BDA0002966311910000107

式中，kh为谐波补偿系数，

Figure BDA0002966311910000108
kih为自适应谐波补偿系数，
Figure BDA0002966311910000109
为PCC电压upcc的谐波分量。where k h is the harmonic compensation coefficient,
Figure BDA0002966311910000108
k ih is the adaptive harmonic compensation coefficient,
Figure BDA0002966311910000109
is the harmonic component of the PCC voltage u pcc .

引入谐波域虚拟阻抗，电压外环参考电压uref谐波分量

Figure BDA00029663119100001010
为：Introducing the virtual impedance in the harmonic domain, the voltage outer loop reference voltage u ref harmonic components
Figure BDA00029663119100001010
for:

Figure BDA00029663119100001011
Figure BDA00029663119100001011

式中，

Figure BDA00029663119100001012
为谐波域虚拟阻抗。In the formula,
Figure BDA00029663119100001012
is the virtual impedance in the harmonic domain.

自适应谐波补偿控制如图4所示，通过式(9)可以得到

Figure BDA00029663119100001013
Figure BDA00029663119100001014
增大会使得kh也增大，由于kh对
Figure BDA00029663119100001015
的作用与
Figure BDA00029663119100001016
相反，可降低
Figure BDA00029663119100001017
对
Figure BDA00029663119100001018
的影响，能够有效实现对
Figure BDA00029663119100001019
的抑制。将kih设置在合理范围内，可以保证谐波电流的分配控制效果。本步骤接下来需要得到kih和
Figure BDA00029663119100001020
的取值范围。The adaptive harmonic compensation control is shown in Figure 4, which can be obtained by formula (9)
Figure BDA00029663119100001013
Figure BDA00029663119100001014
Increasing will make k h also increase, because k h has a
Figure BDA00029663119100001015
role and
Figure BDA00029663119100001016
Conversely, it can be reduced
Figure BDA00029663119100001017
right
Figure BDA00029663119100001018
impact, can effectively achieve the
Figure BDA00029663119100001019
inhibition. Setting k ih within a reasonable range can ensure the distribution and control effect of harmonic current. The next step in this step is to obtain k ih and
Figure BDA00029663119100001020
range of values.

又由于

Figure BDA00029663119100001021
根据图5的逆变器电压外环电流内环双环控制系统，可得：because of
Figure BDA00029663119100001021
According to the double-loop control system of the inverter voltage outer loop current inner loop in Fig. 5, it can be obtained:

Figure BDA0002966311910000111
Figure BDA0002966311910000111

Figure BDA0002966311910000112
Figure BDA0002966311910000112

根据终值定理得稳态下

Figure BDA0002966311910000113
为：According to the final value theorem, under steady state
Figure BDA0002966311910000113
for:

Figure BDA0002966311910000114
Figure BDA0002966311910000114

由于国家标准和IEEE标准规定电网电压THD不得大于5％，即：As the national standard and IEEE standard stipulate that the grid voltage THD shall not be greater than 5%, namely:

Figure BDA0002966311910000115
Figure BDA0002966311910000115

Figure BDA0002966311910000116
和
Figure BDA0002966311910000117
分别取逆变器的额定电压U0、电流值I0，且令
Figure BDA0002966311910000118
以忽略Zl的值，因此由式(12)和式(13)可得：
Figure BDA0002966311910000116
and
Figure BDA0002966311910000117
Take the rated voltage U 0 and current value I 0 of the inverter respectively, and let
Figure BDA0002966311910000118
To ignore the value of Z l , we can obtain from equation (12) and equation (13):

Figure BDA0002966311910000119
Figure BDA0002966311910000119

微电网中往往是多台逆变器进行并联，需要抑制逆变器间谐波环流。本步骤下面分析中，为区别各逆变器的物理量，故在各物理下标中增加了标记逆变器序号，如：

Figure BDA00029663119100001110
为第j台逆变器的输出电流谐波分量，
Figure BDA00029663119100001111
为第k台逆变器的输出电流谐波分量。In the microgrid, multiple inverters are often connected in parallel, and it is necessary to suppress the harmonic circulation between the inverters. In the following analysis of this step, in order to distinguish the physical quantities of each inverter, the inverter serial number is added to each physical subscript, such as:
Figure BDA00029663119100001110
is the output current harmonic component of the jth inverter,
Figure BDA00029663119100001111
is the output current harmonic component of the kth inverter.

抑制逆变器间谐波环流需要按照逆变器容量对逆变器间输出谐波电流进行分配。令微电网中第j、k台逆变器额定功率之比w，则逆变器间谐波电流的分配控制目标为：To suppress the inter-inverter harmonic circulating current, it is necessary to distribute the output harmonic current among the inverters according to the inverter capacity. Let the ratio w of the rated power of the jth and kth inverters in the microgrid, the distribution control objective of the harmonic current between the inverters is:

Figure BDA00029663119100001112
Figure BDA00029663119100001112

将式(15)代入式(12)，可得：Substituting equation (15) into equation (12), we can get:

Figure BDA00029663119100001113
Figure BDA00029663119100001113

式中，

Figure BDA0002966311910000121
为第j台逆变器的谐波虚拟阻抗，Zlj为第j台逆变器与PCC之间的馈线阻抗，kihj为第j台逆变器的自适应谐波补偿系数，
Figure BDA0002966311910000122
为第k台逆变器的谐波虚拟阻抗，Zlk为第k台逆变器与PCC之间的馈线阻抗，kihk为第k台逆变器的自适应谐波补偿系数。In the formula,
Figure BDA0002966311910000121
is the harmonic virtual impedance of the jth inverter, Z lj is the feeder impedance between the jth inverter and the PCC, k ihj is the adaptive harmonic compensation coefficient of the jth inverter,
Figure BDA0002966311910000122
is the harmonic virtual impedance of the kth inverter, Z lk is the feeder impedance between the kth inverter and the PCC, and k ihk is the adaptive harmonic compensation coefficient of the kth inverter.

又由于

Figure BDA0002966311910000123
忽略Zl的影响，由式(16)得：because of
Figure BDA0002966311910000123
Ignoring the effect of Z l , from equation (16) we get:

Figure BDA0002966311910000124
Figure BDA0002966311910000124

根据式(17)可得：According to formula (17), we can get:

Figure BDA0002966311910000125
Figure BDA0002966311910000125

根据式(18)可得为实现逆变器间谐波电流的分配，逆变器额定功率、自适应补偿系数和谐波虚拟阻抗之间的关系为：According to equation (18), in order to realize the distribution of harmonic current among inverters, the relationship between inverter rated power, adaptive compensation coefficient and harmonic virtual impedance is:

Figure BDA0002966311910000126
Figure BDA0002966311910000126

式中，Sn为第n台逆变器的额定功率，

Figure BDA0002966311910000127
为第n台逆变器的谐波虚拟阻抗，kihn为第n台逆变器的自适应补偿系数。这里下标n是表示第n台逆变器，与前面不带下标n的变量是一样的含义。where Sn is the rated power of the nth inverter,
Figure BDA0002966311910000127
is the harmonic virtual impedance of the nth inverter, and k ihn is the adaptive compensation coefficient of the nth inverter. The subscript n here refers to the nth inverter, which has the same meaning as the variable without subscript n.

因此，结合式(14)、式(19)，可得到kih和

Figure BDA0002966311910000128
的取值要求。Therefore, combining equations (14) and (19), k ih and
Figure BDA0002966311910000128
value requirements.

步骤四：基于电压外环参考电压的基波和谐波分量，获得电压外环参考电压

Figure BDA0002966311910000129
通过逆变器电压外环电流内环双环控制得到逆变器三相逆变桥的输出uinv。Step 4: Based on the fundamental wave and harmonic components of the reference voltage of the outer voltage loop, obtain the reference voltage of the outer voltage loop
Figure BDA0002966311910000129
The output u inv of the three-phase inverter bridge of the inverter is obtained through the double-loop control of the voltage outer loop and the inner loop of the inverter.

逆变器电压外环电流内环双环控制如图5所示，Gu(s)为电压外环调节器，通过对逆变器输出电压uo的调节控制给出电流内环的电流参考值iref，Gi(s)为电流内环调节器，通过对电容电流ic的调节控制给出逆变器三相逆变桥的输出uinv，uref为电压外环参考电压值，iref为电流内环参考值，ic为电容电流值，iL为滤波电感电流，Kpwm为逆变器三相逆变桥增益。The double-loop control of the voltage outer loop and the current inner loop of the inverter is shown in Figure 5. Gu (s) is the voltage outer loop regulator, and the current reference value of the current inner loop is given by adjusting and controlling the output voltage u o of the inverter. i ref , G i (s) is the current inner loop regulator, the output u inv of the three-phase inverter bridge of the inverter is given by adjusting and controlling the capacitor current ic , u ref is the reference voltage value of the voltage outer loop, i ref is the reference value of the current inner loop, ic is the capacitor current value, i L is the filter inductor current, and K pwm is the gain of the three-phase inverter bridge of the inverter.

步骤五：基于通过上述步骤得到的逆变器三相逆变桥输出电压uinv，通过SVPWM驱动逆变器的逆变桥各功率管的开关，最终实现本发明的控制目标，即微电网PCC电压谐波分量和逆变器谐波环流的抑制。Step 5: Based on the output voltage u inv of the inverter three-phase inverter bridge obtained through the above steps, the switches of each power tube of the inverter bridge of the inverter are driven by SVPWM, and finally the control target of the present invention is realized, that is, the microgrid PCC Suppression of voltage harmonic components and inverter harmonic currents.

本发明对基波和谐波分量进行分离解耦控制得到逆变器电压外环参考电压的基波和谐波分量，满足基波和谐波分量的不同控制需求。谐波域采用自适应谐波补偿和谐波虚拟阻抗相结合，实现微电网PCC电压谐波分量和逆变器谐波环流的抑制。The invention separates and decouples the fundamental wave and the harmonic components to obtain the fundamental wave and the harmonic components of the reference voltage of the outer loop of the inverter voltage, so as to meet the different control requirements of the fundamental wave and the harmonic components. The harmonic domain adopts the combination of adaptive harmonic compensation and harmonic virtual impedance to realize the suppression of the harmonic components of the PCC voltage of the microgrid and the harmonic circulating current of the inverter.

实施例2Example 2

在Matlab/Simulink建模对本文所提控制方法进行仿真验证，图6为非线性负荷孤岛微电网仿真模型，采用两个逆变器进行仿真，逆变器INV1和逆变器INV2并联，每个逆变器都用本发明策略，k1和k2为继电器开关，Zl1和Zl2为线路阻抗(这两个阻抗相等，就是表1中的Zl)，表1为主要仿真参数，Zload1为三相线性负荷，三相不控整流桥直流侧接Zload2构成非线性负荷。The control method proposed in this paper is simulated and verified by Matlab/Simulink modeling. Figure 6 shows the nonlinear load island microgrid simulation model. Two inverters are used for simulation. The inverter INV1 and the inverter INV2 are connected in parallel. The inverters all use the strategy of the present invention, k 1 and k 2 are relay switches, Z l1 and Z l2 are line impedances (these two impedances are equal, that is, Z l in Table 1), Table 1 is the main simulation parameters, Z load1 is a three-phase linear load, and the DC side of the three-phase uncontrolled rectifier bridge is connected to Z load2 to form a nonlinear load.

表1主要参数Table 1 Main parameters

Figure BDA0002966311910000131
Figure BDA0002966311910000131

Figure BDA0002966311910000141
Figure BDA0002966311910000141

从图7实施例中微电网PCC电压的谐波含量图中可得，采用本发明控制策略能实现在非线性负荷下的孤岛微电网电能质量达标。从图8两个逆变器输出电流波形图中可以看出，逆变器INV2的输出电流为逆变器INV1的2倍，同频同相，且谐波含量接近，表明逆变器间谐波电流能够按照逆变器额定功率进行分配，谐波环流可得到有效抑制。It can be seen from the harmonic content diagram of the PCC voltage of the microgrid in the embodiment of FIG. 7 that the control strategy of the present invention can achieve the power quality of the island microgrid under the nonlinear load. It can be seen from the waveforms of the output currents of the two inverters in Figure 8 that the output current of the inverter INV2 is twice that of the inverter INV1, with the same frequency and phase, and the harmonic content is close, indicating that the inter-inverter harmonics The current can be distributed according to the rated power of the inverter, and the harmonic circulating current can be effectively suppressed.

实施例3Example 3

基于与实施例1同样的发明构思，本发明的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制装置，包括：Based on the same inventive concept as Embodiment 1, an inverter control device for harmonic suppression of a non-linear load islanded microgrid of the present invention includes:

基波谐波分离模块，用于采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量；The fundamental wave harmonic separation module is used to collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the fundamental wave and harmonics of the collected voltage and current to obtain the corresponding fundamental wave and harmonic components;

基波分量计算模块，用于基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量；The fundamental wave component calculation module is used to calculate the instantaneous active and reactive power of the fundamental wave domain inverter based on the obtained fundamental wave components of the inverter output voltage and output current. Using virtual synchronous motor control, the fundamental component of the reference voltage of the outer voltage loop is obtained;

谐波分量计算模块，用于基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量；The harmonic component calculation module is used to introduce an adaptive harmonic compensation loop and a combination of harmonic virtual impedance based on the obtained PCC voltage and the harmonic component of the inverter output current to obtain the harmonic component of the reference voltage of the outer voltage loop;

控制电压计算模块，用于基于获得的电压外环参考电压的基波和谐波分量，计算得到电压外环参考电压，针对电压外环参考电压，采用逆变器电压外环电流内环双环控制，得到逆变器三相逆变桥的控制电压。The control voltage calculation module is used to calculate the reference voltage of the outer voltage loop based on the fundamental wave and harmonic components of the obtained reference voltage of the outer loop of the voltage. For the reference voltage of the outer voltage loop, the inverter voltage outer loop current inner loop double-loop control is adopted. , the control voltage of the inverter three-phase inverter bridge is obtained.

本发明装置的各模块具体实现过程参见实施例1中各步骤的具体实现过程。For the specific implementation process of each module of the device of the present invention, refer to the specific implementation process of each step in Embodiment 1.

本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变型，这些改进和变型也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1.一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，包括以下过程：1. an inverter control method containing nonlinear load islanding microgrid harmonic suppression, is characterized in that, comprises the following process: 采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量；Collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the fundamental wave and harmonics of the collected voltage and current to obtain the corresponding fundamental wave and harmonic components; 基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量；Based on the obtained fundamental components of the output voltage and output current of the inverter, the instantaneous active and reactive power of the fundamental-wave domain inverter are calculated. The fundamental component of the outer loop reference voltage; 基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量；Based on the obtained harmonic components of the PCC voltage and inverter output current, an adaptive harmonic compensation loop and a combination of harmonic virtual impedance are introduced to obtain the harmonic components of the reference voltage of the outer voltage loop; 基于获得的电压外环参考电压的基波和谐波分量，计算得到电压外环参考电压，针对电压外环参考电压，采用逆变器电压外环电流内环双环控制，得到逆变器三相逆变桥的控制电压。Based on the obtained fundamental wave and harmonic components of the voltage outer loop reference voltage, the voltage outer loop reference voltage is calculated. For the voltage outer loop reference voltage, the inverter voltage outer loop current inner loop double-loop control is used to obtain the three-phase inverter. Control voltage of the inverter bridge. 2.根据权利要求1所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述基波和谐波分离是通过带通滤波器实现的。2 . The inverter control method according to claim 1 , wherein the fundamental wave and the harmonics are separated by a band-pass filter. 3 . 3.根据权利要求2所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述基波和谐波分离的计算公式为：3. a kind of inverter control method containing nonlinear load islanding microgrid harmonic suppression according to claim 2, is characterized in that, the calculation formula of described fundamental wave and harmonic separation is: 逆变器输出电流io的基波和谐波分量计算公式为：The formula for calculating the fundamental and harmonic components of the inverter output current i o is:
Figure FDA0002966311900000011
Figure FDA0002966311900000011
 其中，
Figure FDA0002966311900000012
和
Figure FDA0002966311900000013
为逆变器输出电流io的基波和谐波分量，ζ为带通滤波器阻尼系数，ω为逆变器基波电角速度实际值。in,
Figure FDA0002966311900000012
and
Figure FDA0002966311900000013
are the fundamental and harmonic components of the inverter output current i o , ζ is the damping coefficient of the band-pass filter, and ω is the actual value of the fundamental electrical angular velocity of the inverter. 4.根据权利要求1所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，包括：4 . The inverter control method for harmonic suppression of a non-linear load islanded microgrid according to claim 1 , wherein the fundamental wave component based on the obtained inverter output voltage and output current, Calculate the instantaneous active and reactive power of the fundamental-wave domain inverter, including: 基于得到的逆变器输出电压uo和输出电流io的基波分量，计算VSG控制所采用的基波域逆变器瞬时有功Pf和无功Qf，公式为：Based on the obtained fundamental components of the inverter output voltage u o and output current i o , the instantaneous active power P f and reactive power Q f of the fundamental-wave domain inverter used in VSG control are calculated, and the formulas are:
Figure FDA0002966311900000021
Figure FDA0002966311900000021
 式中，
Figure FDA0002966311900000022
为逆变器输出电压基波分量
Figure FDA0002966311900000023
的dq分量，
Figure FDA0002966311900000024
为逆变器输出电流基波分量
Figure FDA0002966311900000025
的dq分量。In the formula,
Figure FDA0002966311900000022
is the fundamental component of the inverter output voltage
Figure FDA0002966311900000023
The dq component of ,
Figure FDA0002966311900000024
The fundamental component of the output current for the inverter
Figure FDA0002966311900000025
dq component of . 5.根据权利要求1所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量，包括：5. The inverter control method according to claim 1, wherein a virtual synchronous motor is used for the instantaneous active and reactive power of the fundamental-wave domain inverter. control to obtain the fundamental component of the reference voltage of the outer voltage loop, including: 基于基波域逆变器瞬时有功Pf和无功Qf，VSG控制方程为：Based on the instantaneous active power P f and reactive power Q f of the fundamental-wave domain inverter, the VSG control equation is:
Figure FDA0002966311900000026
Figure FDA0002966311900000026
 式中，P0为逆变器额定有功，kω为有功下垂系数，ω为逆变器电角速度实际值，Pref为逆变器给定参考有功，ω0为逆变器额定电角速度，J为转动惯量，D为VSG控制阻尼系数，U0为逆变器额定电压幅值，nQ为无功下垂系数，Q0为逆变器额定无功，Uref为逆变器给定参考电压幅值；ku为PCC电压调节系数；In the formula, P 0 is the rated active power of the inverter, k ω is the active power droop coefficient, ω is the actual value of the electrical angular velocity of the inverter, P ref is the given reference active power of the inverter, ω 0 is the rated electrical angular velocity of the inverter, J is the moment of inertia, D is the VSG control damping coefficient, U 0 is the rated voltage amplitude of the inverter, n Q is the reactive power droop coefficient, Q 0 is the rated reactive power of the inverter, and U ref is the inverter given reference Voltage amplitude; ku is the PCC voltage regulation coefficient; 根据式(5)可得VSG给定的基波域电压参考值为：According to formula (5), the reference value of fundamental wave domain voltage given by VSG can be obtained:
Figure FDA0002966311900000031
Figure FDA0002966311900000031
 式中，θ为逆变器相角，
Figure FDA0002966311900000032
t表示时间，
Figure FDA0002966311900000033
为逆变器初始相角；where θ is the inverter phase angle,
Figure FDA0002966311900000032
t represents time,
Figure FDA0002966311900000033
is the initial phase angle of the inverter; 进一步引入基波域虚拟阻抗
Figure FDA0002966311900000034
得到电压外环参考电压的基波分量
Figure FDA0002966311900000035
为：Further introduction of fundamental domain virtual impedance
Figure FDA0002966311900000034
Obtain the fundamental component of the voltage outer loop reference voltage
Figure FDA0002966311900000035
for:
Figure FDA0002966311900000036
Figure FDA0002966311900000036
 其中，基波域虚拟阻抗
Figure FDA0002966311900000037
Figure FDA0002966311900000038
为
Figure FDA0002966311900000039
的电阻部分，
Figure FDA00029663119000000310
为
Figure FDA00029663119000000311
的电感部分。Among them, the virtual impedance of the fundamental wave domain
Figure FDA0002966311900000037
Figure FDA0002966311900000038
for
Figure FDA0002966311900000039
the resistor part,
Figure FDA00029663119000000310
for
Figure FDA00029663119000000311
the inductive part. 6.根据权利要求1所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量，包括：6 . The inverter control method for harmonic suppression of a non-linear load islanded microgrid according to claim 1 , wherein, based on the obtained PCC voltage and the harmonic components of the inverter output current, 6 . Introducing the adaptive harmonic compensation loop and the combination of the harmonic virtual impedance to obtain the harmonic components of the reference voltage of the outer voltage loop, including: 基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环，得到自适应谐波补偿环得到的补偿量；Based on the obtained harmonic components of PCC voltage and inverter output current, an adaptive harmonic compensation loop is introduced to obtain the compensation amount obtained by the adaptive harmonic compensation loop; 基于自适应谐波补偿环得到的补偿量和逆变器输出电流的谐波分量，引入谐波虚拟阻抗相结合，得到电压外环参考电压谐波分量。Based on the compensation amount obtained by the adaptive harmonic compensation loop and the harmonic components of the inverter output current, the harmonic components of the reference voltage of the outer voltage loop are obtained by introducing the combination of the harmonic virtual impedance. 7.根据权利要求1所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量，包括：7 . The inverter control method of claim 1 , wherein the harmonic components of the obtained PCC voltage and inverter output current, Introducing the adaptive harmonic compensation loop and the combination of the harmonic virtual impedance to obtain the harmonic components of the reference voltage of the outer voltage loop, including: 电压外环参考电压谐波分量中引入自适应谐波补偿环，则自适应谐波补偿环得到的补偿量Uh表达为：An adaptive harmonic compensation loop is introduced into the reference voltage harmonic component of the voltage outer loop, and the compensation amount U h obtained by the adaptive harmonic compensation loop is expressed as:
Figure FDA0002966311900000041
Figure FDA0002966311900000041
 式中，kh为谐波补偿系数，
Figure FDA0002966311900000042
kih为自适应谐波补偿系数，
Figure FDA0002966311900000043
为PCC电压upcc的谐波分量；
Figure FDA0002966311900000044
为逆变器输出电流谐波分量；where k h is the harmonic compensation coefficient,
Figure FDA0002966311900000042
k ih is the adaptive harmonic compensation coefficient,
Figure FDA0002966311900000043
is the harmonic component of the PCC voltage u pcc ;
Figure FDA0002966311900000044
is the harmonic component of the inverter output current; 引入谐波域虚拟阻抗，电压外环参考电压uref谐波分量
Figure FDA0002966311900000045
为：Introduce the virtual impedance in the harmonic domain, the voltage outer loop reference voltage u ref harmonic components
Figure FDA0002966311900000045
for:
Figure FDA0002966311900000046
Figure FDA0002966311900000046
 式中，
Figure FDA0002966311900000047
为谐波域虚拟阻抗。In the formula,
Figure FDA0002966311900000047
is the virtual impedance in the harmonic domain. 8.根据权利要求7所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述自适应谐波补偿系数kih的取值范围为：8. a kind of inverter control method containing nonlinear load islanded microgrid harmonic suppression according to claim 7, is characterized in that, the value range of described adaptive harmonic compensation coefficient k ih is: 自适应谐波补偿系数要满足以下要求：The adaptive harmonic compensation coefficient must meet the following requirements:
Figure FDA0002966311900000048
Figure FDA0002966311900000048
 其中，U0为逆变器额定电压幅值，I0为逆变器额定电流值。Among them, U 0 is the rated voltage amplitude of the inverter, and I 0 is the rated current value of the inverter. 9.根据权利要求7所述的一种含非线性负荷孤岛微电网谐波抑制的逆变器控制方法，其特征是，所述自适应谐波补偿系数和谐波虚拟阻抗还需满足：9. A kind of inverter control method containing nonlinear load islanded microgrid harmonic suppression according to claim 7, is characterized in that, described adaptive harmonic compensation coefficient and harmonic virtual impedance also need to satisfy: 多个逆变器之间，逆变器额定功率、自适应补偿系数和谐波虚拟阻抗之间的关系为：Among multiple inverters, the relationship between inverter rated power, adaptive compensation coefficient and harmonic virtual impedance is:
Figure FDA0002966311900000049
Figure FDA0002966311900000049
 式中，Sn为第n台逆变器的额定功率，
Figure FDA00029663119000000410
为第n台逆变器的谐波虚拟阻抗，kihn为第n台逆变器的自适应补偿系数。where Sn is the rated power of the nth inverter,
Figure FDA00029663119000000410
is the harmonic virtual impedance of the nth inverter, and k ihn is the adaptive compensation coefficient of the nth inverter. 10.一种含非线性负荷孤岛微电网谐波抑制的逆变器控制装置，其特征是，包括：10. An inverter control device for harmonic suppression of a non-linear load islanded microgrid, characterized in that it comprises: 基波谐波分离模块，用于采集逆变器的输出电压、输出电流和微电网的PCC电压，分别对采集的电压电流进行基波和谐波分离，获得对应的基波和谐波分量；The fundamental wave harmonic separation module is used to collect the output voltage and output current of the inverter and the PCC voltage of the microgrid, and separate the fundamental wave and harmonics of the collected voltage and current to obtain the corresponding fundamental wave and harmonic components; 基波分量计算模块，用于基于获得的逆变器输出电压和输出电流的基波分量，计算得到基波域逆变器瞬时有功和无功，对基波域逆变器瞬时有功和无功采用虚拟同步电机控制，得到电压外环参考电压的基波分量；The fundamental wave component calculation module is used to calculate the instantaneous active and reactive power of the fundamental wave domain inverter based on the obtained fundamental wave components of the inverter output voltage and output current. Using virtual synchronous motor control, the fundamental component of the reference voltage of the outer voltage loop is obtained; 谐波分量计算模块，用于基于获得的PCC电压和逆变器输出电流的谐波分量，引入自适应谐波补偿环和谐波虚拟阻抗相结合，得到电压外环参考电压的谐波分量；The harmonic component calculation module is used to introduce the adaptive harmonic compensation loop and the harmonic virtual impedance combination based on the obtained PCC voltage and the harmonic component of the inverter output current to obtain the harmonic component of the reference voltage of the outer voltage loop; 控制电压计算模块，用于基于获得的电压外环参考电压的基波和谐波分量，计算得到电压外环参考电压，针对电压外环参考电压，采用逆变器电压外环电流内环双环控制，得到逆变器三相逆变桥的控制电压。The control voltage calculation module is used to calculate the reference voltage of the outer voltage loop based on the fundamental wave and harmonic components of the obtained reference voltage of the outer loop of the voltage. For the reference voltage of the outer voltage loop, the inverter voltage outer loop current inner loop double-loop control is adopted , the control voltage of the inverter three-phase inverter bridge is obtained.
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