CN116526813A - A single-phase bridge rectifier input current third harmonic suppression method and system - Google Patents
A single-phase bridge rectifier input current third harmonic suppression method and system Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
Description
技术领域technical field
本发明涉及单相脉冲宽度调制PWM整流器技术领域,更具体地,涉及一种单相桥式整流器输入电流三次谐波抑制方法及系统。The present invention relates to the technical field of single-phase pulse width modulation PWM rectifiers, and more specifically, to a method and system for suppressing the third harmonic of input current of a single-phase bridge rectifier.
背景技术Background technique
单相脉冲宽度调制PWM整流器是一种比较常见的AC-DC变换拓扑。功率因数可控,能够实现能量的双向流动;电网输入电流正弦度高,谐波小;输出母线电压可控。广泛应用于各类中小功率AC-DC-DC电源的前级整流,在通信电源、超导储能、不间断电源、特种电源领域都有十分广泛的应用。Single-phase pulse width modulation PWM rectifier is a relatively common AC-DC conversion topology. The power factor is controllable, which can realize the bidirectional flow of energy; the grid input current has high sine degree and low harmonic; the output bus voltage is controllable. It is widely used in the pre-stage rectification of various small and medium power AC-DC-DC power supplies, and has a very wide range of applications in the fields of communication power supplies, superconducting energy storage, uninterruptible power supplies, and special power supplies.
由于单相输入的功率具有两倍工频的周期性脉动,输出直流电压不可避免会存在相应的两倍工频纹波分量,这些两倍工频纹波被引入控制系统后,最终会造成电网电流波形的畸变,出现较大的三次谐波,增大电流的总谐波失真,影响电网的电能质量。Since the single-phase input power has a periodic pulsation of twice the power frequency, there will inevitably be a corresponding double power frequency ripple component in the output DC voltage. After these double power frequency ripples are introduced into the control system, they will eventually cause power grid Distortion of the current waveform, large third harmonics appear, increase the total harmonic distortion of the current, and affect the power quality of the grid.
为了减小输出电压纹波对电网电流的影响,传统的做法是在反馈环路中引入低通滤波器,但这会减小系统的带宽,影响变换器的响应速度。因此,需要一种技术,以实现对单相桥式整流器输入电流三次谐波进行抑制。In order to reduce the impact of the output voltage ripple on the grid current, the traditional approach is to introduce a low-pass filter in the feedback loop, but this will reduce the bandwidth of the system and affect the response speed of the converter. Therefore, a technology is needed to suppress the third harmonic of the input current of the single-phase bridge rectifier.
发明内容Contents of the invention
本发明技术方案提供一种单相桥式整流器输入电流三次谐波抑制方法及系统,以解决如何对单相桥式整流器输入电流三次谐波进行抑制的问题。The technical solution of the present invention provides a method and system for suppressing the third harmonic of the input current of a single-phase bridge rectifier to solve the problem of how to suppress the third harmonic of the input current of the single-phase bridge rectifier.
为了解决上述问题,本发明提供了一种单相桥式整流器输入电流三次谐波抑制方法,所述方法包括:In order to solve the above problems, the invention provides a method for suppressing the third harmonic of the input current of a single-phase bridge rectifier, said method comprising:
采集电网的电压实时值us,并计算电压幅值Usm;Collect the real-time voltage value u s of the grid, and calculate the voltage amplitude U sm ;
基于所述电压实时值us通过锁相环,获取电网的电压矢量角θ;基于所述电压矢量角θ,生成余弦信号cosθ;Based on the voltage real-time value u s through a phase-locked loop, the voltage vector angle θ of the grid is obtained; based on the voltage vector angle θ, a cosine signal cosθ is generated;
基于预设的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *;基于所述电压幅值Usm、所述余弦信号cosθ以及所述电网有功电流指令Isd *对电网功率波动进行预测;Based on the preset output DC voltage command U dc * , the grid active current command I sd * is obtained through the voltage outer loop control loop; based on the voltage amplitude U sm , the cosine signal cosθ and the grid active current command I sd * predicts grid power fluctuations;
基于预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中的电压波纹;Based on the predicted grid power fluctuations, combined with the hardware parameters of the single-phase pulse width modulation PWM rectifier, the voltage ripple in the output voltage is predicted;
对所述电压纹波叠加至控制系统的输出电压实时值Udc,经过电压外环,获取电网电流有功值指令Isd *;基于所述电网电流有功值指令Isd *对单相脉冲宽度调制PWM整流器的输入电流三次谐波进行抑制。Superimpose the voltage ripple to the real-time value U dc of the output voltage of the control system, and obtain the grid current active value command I sd * through the voltage outer loop; based on the grid current active value command I sd * , single-phase pulse width modulation The third harmonic of the input current of the PWM rectifier is suppressed.
优选地,所述基于所述电压实时值us,通过锁相环,获取电网电压的矢量角θ,包括:Preferably, the acquisition of the grid voltage vector angle θ through a phase-locked loop based on the real-time voltage value u s includes:
将电压实时值us映射到两相静止坐标系得到usα,将电压实时值us延迟90°得到usβ,将usα、usβ进行坐标变换得到两相旋转坐标系的usd、usq;经控制系统将usq控制为0,加上314rad/s的速度前馈,通过积分获取电网电压的矢量角θ。Map the real-time voltage value u s to the two-phase stationary coordinate system to get u sα , delay the real-time voltage value u s by 90° to get u sβ , and transform u sα and u sβ to get u sd , u in the two-phase rotating coordinate system sq ; u sq is controlled to 0 by the control system, and the speed feedforward of 314rad/s is added, and the vector angle θ of the grid voltage is obtained through integration.
优选地,预测的电网功率波动为:Preferably, the predicted grid power fluctuation is:
其中,ps为电网的实时功率,θ=ωt,ω为电网电压角频率,t为时间,Δps为功率的波动分量。Among them, p s is the real-time power of the power grid, θ=ωt, ω is the angular frequency of the grid voltage, t is time, and Δps is the fluctuation component of power.
优选地,预测输出电压中的电压波纹为:Preferably, the voltage ripple in the predicted output voltage is:
其中,θ=ωt,ω为电网电压角频率,t为时间,Udc *为输出电压指令值,C为单相脉冲宽度调制PWM整流器的输出滤波电容。Among them, θ=ωt, ω is the grid voltage angular frequency, t is time, U dc * is the output voltage command value, C is the output filter capacitor of the single-phase pulse width modulation PWM rectifier.
优选地,所述电网电流有功值指令Isd *为:Preferably, the grid current active value command I sd * is:
其中,Kp,Ki为PI控制器的参数,s为拉普拉斯算子,Udc *为直流电压指令,Udc为输出电压实时采样值,Δudc为预测的电压纹波。Among them, K p and K i are the parameters of the PI controller, s is the Laplacian operator, U dc * is the DC voltage command, U dc is the real-time sampled value of the output voltage, and Δu dc is the predicted voltage ripple.
基于本发明的另一方面,本发明提供一种单相桥式整流器输入电流三次谐波抑制系统,所述系统包括:Based on another aspect of the present invention, the present invention provides a single-phase bridge rectifier input current third harmonic suppression system, said system comprising:
初始单元,用于采集电网的电压实时值us,并计算电压幅值Usm;The initial unit is used to collect the real-time value u s of the grid voltage and calculate the voltage amplitude U sm ;
执行单元,用于基于所述电压实时值us通过锁相环,获取电网的电压矢量角θ;基于所述电压矢量角θ,生成余弦信号cosθ;基于预设的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *;基于所述电压幅值Usm、所述余弦信号cosθ以及所述电网有功电流指令Isd *对电网功率波动进行预测;基于预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中的电压波纹;The execution unit is used to obtain the voltage vector angle θ of the power grid through the phase-locked loop based on the real-time voltage value u s ; based on the voltage vector angle θ, generate a cosine signal cosθ; based on the preset output DC voltage command U dc * , the grid active current command I sd * is obtained through the voltage outer loop control loop; based on the voltage amplitude U sm , the cosine signal cosθ and the grid active current command I sd * , the grid power fluctuation is predicted; based on the prediction The grid power fluctuation, combined with the hardware parameters of the single-phase pulse width modulation PWM rectifier, predicts the voltage ripple in the output voltage;
结果单元,用于对所述电压纹波叠加至控制系统的输出电压实时值Udc,经过电压外环,获取电网电流有功值指令Isd *;基于所述电网电流有功值指令Isd *对单相脉冲宽度调制PWM整流器的输入电流三次谐波进行抑制。The result unit is used to superimpose the voltage ripple to the real-time value U dc of the output voltage of the control system, and obtain the grid current active value command I sd * through the voltage outer loop; based on the grid current active value command I sd * for The third harmonic of the input current of the single-phase pulse width modulated PWM rectifier is suppressed.
优选地,所述执行单元,用于基于所述电压实时值us,通过锁相环,获取电网电压的矢量角θ,包括:Preferably, the execution unit is configured to acquire the vector angle θ of the grid voltage through a phase-locked loop based on the real-time voltage value u s , including:
将电压实时值us映射到两相静止坐标系得到usα,将电压实时值us延迟90°得到usβ,将usα、usβ进行坐标变换得到两相旋转坐标系的usd、usq;经控制系统将usq控制为0,加上314rad/s的速度前馈,通过积分获取电网电压的矢量角θ。Map the real-time voltage value u s to the two-phase stationary coordinate system to get u sα , delay the real-time voltage value u s by 90° to get u sβ , and transform u sα and u sβ to get u sd , u in the two-phase rotating coordinate system sq ; u sq is controlled to 0 by the control system, and the speed feedforward of 314rad/s is added, and the vector angle θ of the grid voltage is obtained through integration.
优选地,预测的电网功率波动为:Preferably, the predicted grid power fluctuation is:
其中,ps为电网的实时功率,θ=ωt,ω为电网电压角频率,t为时间,Δps为功率的波动分量。Among them, p s is the real-time power of the power grid, θ=ωt, ω is the angular frequency of the grid voltage, t is time, and Δps is the fluctuation component of power.
优选地,预测输出电压中的电压波纹为:Preferably, the voltage ripple in the predicted output voltage is:
其中,θ=ωt,ω为电网电压角频率,t为时间,Udc *为输出电压指令值,C为单相脉冲宽度调制PWM整流器的输出滤波电容。Among them, θ=ωt, ω is the grid voltage angular frequency, t is time, U dc * is the output voltage command value, C is the output filter capacitor of the single-phase pulse width modulation PWM rectifier.
优选地,所述电网电流有功值指令Isd *为:Preferably, the grid current active value command I sd * is:
其中,Kp,Ki为PI控制器的参数,s为拉普拉斯算子,Udc *为直流电压指令,Udc为输出电压实时采样值,Δudc为预测的电压纹波。Among them, K p and K i are the parameters of the PI controller, s is the Laplacian operator, U dc * is the DC voltage command, U dc is the real-time sampled value of the output voltage, and Δu dc is the predicted voltage ripple.
本发明提供一种计算机可读存储介质,计算机可读存储介质存储有计算机程序,计算机程序用于执行上述一种单相桥式整流器输入电流三次谐波抑制的方法。The present invention provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program is used to implement the above-mentioned method for suppressing the third harmonic of the input current of a single-phase bridge rectifier.
本发明提供一种电子设备,电子设备包括:处理器和存储器;其中,The present invention provides an electronic device, and the electronic device includes: a processor and a memory; wherein,
存储器,用于存储处理器可执行指令的存储器;memory for storing processor-executable instructions;
处理器,用于从存储器中读取可执行指令,并执行指令以实现上述一种单相桥式整流器输入电流三次谐波抑制的方法。The processor is used for reading executable instructions from the memory, and executing the instructions to realize the above-mentioned method for suppressing the third harmonic of the input current of a single-phase bridge rectifier.
本发明技术方案提供了一种单相桥式整流器输入电流三次谐波抑制方法及系统,其中方法包括:采集电网的电压实时值us,并计算电压幅值Usm;基于电压实时值us通过锁相环,获取电网的电压矢量角θ;基于电压矢量角θ,生成余弦信号cosθ;基于预设的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *;基于电压幅值Usm、余弦信号cosθ以及电网有功电流指令Isd *对电网功率波动进行预测;基于预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中的电压波纹;对电压纹波叠加至控制系统的输出电压实时值Udc,经过电压外环,获取电网电流有功值指令Isd *;基于电网电流有功值指令Isd *对单相脉冲宽度调制PWM整流器的输入电流三次谐波进行抑制。本发明技术方案不必新增输出电流传感器,仅从已有数据出发,从算法上做出优化,不用增加硬件成本,对于不同的负载情况均适用,实现了电网电流三次谐波的有效抑制。The technical scheme of the present invention provides a single-phase bridge rectifier input current third harmonic suppression method and system, wherein the method includes: collecting the voltage real-time value u s of the power grid, and calculating the voltage amplitude U sm ; based on the voltage real-time value u s Through the phase-locked loop, the voltage vector angle θ of the grid is obtained; based on the voltage vector angle θ, the cosine signal cosθ is generated; based on the preset output DC voltage command U dc * , the active current command I sd of the grid is obtained through the voltage outer loop control loop * ; Based on voltage amplitude U sm , cosine signal cosθ and grid active current command I sd * , predict grid power fluctuations; based on predicted grid power fluctuations, combined with hardware parameters of single-phase pulse width modulation PWM rectifiers, predict output voltage The voltage ripple; the voltage ripple is superimposed on the real-time value U dc of the output voltage of the control system, and the grid current active value command I sd * is obtained through the voltage outer loop; the single-phase pulse width modulation is based on the grid current active value command I sd * The third harmonic of the input current of the PWM rectifier is suppressed. The technical solution of the present invention does not need to add an output current sensor, only starts from the existing data, optimizes the algorithm, does not increase the hardware cost, is applicable to different load conditions, and realizes the effective suppression of the third harmonic of the grid current.
附图说明Description of drawings
通过参考下面的附图,可以更为完整地理解本发明的示例性实施方式:A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:
图1为根据本发明优选实施方式的一种单相桥式整流器输入电流三次谐波抑制方法流程图;Fig. 1 is a flow chart of a method for suppressing the third harmonic of a single-phase bridge rectifier input current according to a preferred embodiment of the present invention;
图2为根据本发明优选实施方式的一种单相桥式整流器输入电流三次谐波抑制方法流程图;Fig. 2 is a flow chart of a method for suppressing the third harmonic of the input current of a single-phase bridge rectifier according to a preferred embodiment of the present invention;
图3为根据本发明优选实施方式的一种单相高频脉冲宽度调制PWM整流器输入电流三次谐波抑制方法提供的主电路拓扑图;Fig. 3 is the main circuit topological diagram provided according to a kind of single-phase high-frequency pulse width modulation PWM rectifier input current third harmonic suppression method according to the preferred embodiment of the present invention;
图4为根据本发明优选实施方式的单相高频脉冲宽度调制PWM整流器输入电流三次谐波抑制方法所提供的电压电流控制框图;4 is a voltage and current control block diagram provided by the single-phase high-frequency pulse width modulation PWM rectifier input current third harmonic suppression method according to a preferred embodiment of the present invention;
图5为根据未使用本发明优选实施方式的电网输入电流THD;Fig. 5 is according to not using the grid input current THD of the preferred embodiment of the present invention;
图6为根据本发明优选实施方式的电网输入电流THD;Fig. 6 is grid input current THD according to a preferred embodiment of the present invention;
图7为根据本发明优选实施方式的一种单相桥式整流器输入电流三次谐波抑制系统结构图。Fig. 7 is a structural diagram of a third harmonic suppression system for input current of a single-phase bridge rectifier according to a preferred embodiment of the present invention.
具体实施方式Detailed ways
现在参考附图介绍本发明的示例性实施方式,然而,本发明可以用许多不同的形式来实施,并且不局限于此处描述的实施例,提供这些实施例是为了详尽地且完全地公开本发明,并且向所属技术领域的技术人员充分传达本发明的范围。对于表示在附图中的示例性实施方式中的术语并不是对本发明的限定。在附图中,相同的单元/元件使用相同的附图标记。Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.
除非另有说明,此处使用的术语(包括科技术语)对所属技术领域的技术人员具有通常的理解含义。另外,可以理解的是,以通常使用的词典限定的术语,应当被理解为与其相关领域的语境具有一致的含义,而不应该被理解为理想化的或过于正式的意义。Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.
图1为根据本发明优选实施方式的一种单相桥式整流器输入电流三次谐波抑制方法流程图。本发明针对现有技术的缺陷和改进需求,提供一种单相高频脉冲宽度调制PWM整流器输入电流三次谐波抑制方法,改善输出直流电压两倍工频纹波对于输入侧电网电流的影响,同时改善现有的在控制环路中增加低通滤波器的方案所带来的系统响应速度变慢的问题。本发明基于图3进行电流三次谐波抑制。Fig. 1 is a flowchart of a method for suppressing the third harmonic of input current of a single-phase bridge rectifier according to a preferred embodiment of the present invention. Aiming at the defects and improvement needs of the prior art, the present invention provides a method for suppressing the third harmonic of the input current of a single-phase high-frequency pulse width modulation PWM rectifier, which improves the influence of the output DC voltage twice the power frequency ripple on the input side power grid current, At the same time, the problem of slow system response caused by the existing solution of adding a low-pass filter in the control loop is improved. The present invention performs current third harmonic suppression based on FIG. 3 .
如图1所示,本发明提供一种单相桥式整流器输入电流三次谐波抑制方法,方法包括:As shown in Figure 1, the present invention provides a method for suppressing the third harmonic of the input current of a single-phase bridge rectifier, the method comprising:
步骤101:采集电网的电压实时值us,并计算电压幅值Usm;Step 101: collect the real-time value u s of the grid voltage, and calculate the voltage amplitude U sm ;
本发明在步骤101:采集电网的电压电流实时值,得到其幅值与相位信息。通过传感器采集电网侧的电压电流信息,电压实时值us,电流实时值is,并计算电网电压有效值Us,电流有效值Is,电压幅值Usm,电流幅值Ism。In step 101 of the present invention: collect the real-time voltage and current values of the power grid to obtain its amplitude and phase information. The voltage and current information on the grid side, the real-time voltage value u s and the real-time current value is is collected through the sensor, and the effective value of the grid voltage U s , the effective value of the current I s , the voltage amplitude U sm , and the current amplitude I sm are calculated.
步骤102:基于电压实时值us通过锁相环,获取电网的电压矢量角θ;基于电压矢量角θ,生成余弦信号cosθ;Step 102: Obtain the voltage vector angle θ of the power grid through the phase-locked loop based on the real-time voltage value u s ; generate a cosine signal cosθ based on the voltage vector angle θ;
优选地,基于电压实时值us,通过锁相环,获取电网电压的矢量角θ,包括:Preferably, based on the real-time voltage value u s , the vector angle θ of the grid voltage is obtained through a phase-locked loop, including:
将电压实时值us映射到两相静止坐标系得到usα,将电压实时值us延迟90°得到usβ,将usα、usβ进行坐标变换得到两相旋转坐标系的usd、usq;经控制系统将usq控制为0,加上314rad/s的速度前馈,通过积分获取电网电压的矢量角θ。Map the real-time voltage value u s to the two-phase stationary coordinate system to get u sα , delay the real-time voltage value u s by 90° to get u sβ , and transform u sα and u sβ to get u sd , u in the two-phase rotating coordinate system sq ; u sq is controlled to 0 by the control system, and the speed feedforward of 314rad/s is added, and the vector angle θ of the grid voltage is obtained through integration.
本发明在步骤102依据步骤101所获取的电压实时值us,使用锁相环,获取电网电压的矢量角θ,并生成一组正余弦信号sinθ,cosθ。In step 102, according to the real-time voltage value u s obtained in step 101, the present invention uses a phase-locked loop to obtain the vector angle θ of the grid voltage, and generates a set of sinθ and cosine signals sinθ, cosθ.
本发明在步骤102中将电压实时值us映射到两相静止坐标系得到usα,将电压实时值us延迟90°得到usβ,将usα、usβ进行坐标变换得到两相旋转坐标系的usd、usq。经控制系统将usq控制为0,加上314rad/s的速度前馈,积分得到电网电压矢量角θ。In step 102, the present invention maps the real-time voltage value u s to the two-phase stationary coordinate system to obtain u sα , delays the real-time voltage value u s by 90° to obtain u sβ , and performs coordinate transformation on u sα and u sβ to obtain two-phase rotating coordinates Department of u sd , u sq . The control system controls u sq to 0, plus the speed feedforward of 314rad/s, and integrates to obtain the grid voltage vector angle θ.
步骤103:基于预设的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *;基于电压幅值Usm、余弦信号cosθ以及电网有功电流指令Isd *对电网功率波动进行预测;Step 103: Based on the preset output DC voltage command U dc * , the grid active current command I sd * is obtained through the voltage outer loop control loop; based on the voltage amplitude U sm , the cosine signal cosθ and the grid active current command I sd * Grid power fluctuations are predicted;
优选地,预测的电网功率波动为:Preferably, the predicted grid power fluctuation is:
其中,ps为电网的实时功率,θ=ωt,ω为电网电压角频率,t为时间,Δps为功率的波动分量。Among them, p s is the real-time power of the power grid, θ=ωt, ω is the angular frequency of the grid voltage, t is time, and Δps is the fluctuation component of power.
本发明在步骤103依据步骤102的cosθ和所述S1中的Usm,得到电网电压实时值Usmcosθ;依据给定的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *,并得到所预测的电网电流实时值Isd *cosθ,并预测电网的功率波动情况。In step 103, the present invention obtains the grid voltage real-time value U sm cosθ based on cosθ in step 102 and U sm in S1; and obtains grid active power through a voltage outer loop control loop based on a given output DC voltage command U dc * Current command I sd * , and get the predicted grid current real-time value I sd * cosθ, and predict the power fluctuation of the grid.
本发明在步骤103所采用的电网电压实时值Usmcosθ,为依据电网电压有效值与矢量角θ计算所得到计算值,并非电网电压传感器所采样的实时值。The grid voltage real-time value U sm cosθ used in step 103 of the present invention is a calculated value calculated based on the grid voltage effective value and the vector angle θ, not the real-time value sampled by the grid voltage sensor.
本发明预测的电网功率表达式为:The grid power expression that the present invention predicts is:
其中,ps为电网的实时功率,Usm为电网电压的幅值,Isd *为电流环指令,θ为电网电压矢量角,θ=ωt,ω为电网电压角频率。Among them, p s is the real-time power of the grid, U sm is the amplitude of the grid voltage, I sd * is the current loop command, θ is the vector angle of the grid voltage, θ=ωt, and ω is the angular frequency of the grid voltage.
步骤104:基于预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中的电压波纹;Step 104: Predict the voltage ripple in the output voltage based on the predicted grid power fluctuations, combined with the hardware parameters of the single-phase pulse width modulation PWM rectifier;
优选地,预测输出电压中的电压波纹为:Preferably, the voltage ripple in the predicted output voltage is:
其中,θ=ωt,ω为电网电压角频率,t为时间,Udc *为输出电压指令值,C为单相脉冲宽度调制PWM整流器的输出滤波电容。Among them, θ=ωt, ω is the grid voltage angular frequency, t is time, U dc * is the output voltage command value, C is the output filter capacitor of the single-phase pulse width modulation PWM rectifier.
本发明在步骤104中,根据步骤103所预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中将会含有的两倍工频纹波幅值与相位。In step 104 of the present invention, according to the grid power fluctuation predicted in step 103, combined with the hardware parameters of the single-phase pulse width modulation PWM rectifier, the amplitude and phase of twice the power frequency ripple that will be included in the output voltage are predicted.
本发明步骤103中预测电网功率波动所采用的电流信息,为直流电压指令Udc *经控制环路所得到的有功电流指令Isd *,并非电网电流传感器所采样的实时值,且仅用于单位功率因数的工作条件。The current information used to predict the grid power fluctuation in step 103 of the present invention is the active current command I sd * obtained by the DC voltage command U dc * through the control loop, not the real-time value sampled by the grid current sensor, and is only used for Unity power factor operating conditions.
本发明预测的输出电压纹波表达式为:The output voltage ripple expression that the present invention predicts is:
其中,Usm为电网电压的幅值,Isd *为电流环指令,θ为电网电压矢量角,θ=ωt,ω为电网电压角频率,Udc *为输出电压指令值,C为单相脉冲宽度调制PWM整流器的输出滤波电容。采用Udc *而非输出电压实时采样值Udc计算,以避免将输出电压中纹波引入控制系统。Among them, U sm is the amplitude of grid voltage, I sd * is the current loop command, θ is the vector angle of grid voltage, θ=ωt, ω is the angular frequency of grid voltage, U dc * is the command value of output voltage, and C is single-phase Output Filter Capacitor for Pulse Width Modulation PWM Rectifier. U dc * is used instead of the real-time sampled value U dc of the output voltage for calculation to avoid introducing ripples in the output voltage into the control system.
步骤105:对电压纹波叠加至控制系统的输出电压实时值Udc,经过电压外环,获取电网电流有功值指令Isd *;基于电网电流有功值指令Isd *对单相脉冲宽度调制PWM整流器的输入电流三次谐波进行抑制。Step 105: Superimpose the voltage ripple to the real-time value U dc of the output voltage of the control system, and obtain the grid current active value command I sd * through the voltage outer loop; based on the grid current active value command I sd * , single-phase pulse width modulation PWM The third harmonic of the input current of the rectifier is suppressed.
优选地,电网电流有功值指令Isd *为:Preferably, the grid current active value command I sd * is:
其中,Kp,Ki为PI控制器的参数,s为拉普拉斯算子,Udc *为直流电压指令,Udc为输出电压实时采样值,Δudc为预测的电压纹波。Among them, K p and K i are the parameters of the PI controller, s is the Laplacian operator, U dc * is the DC voltage command, U dc is the real-time sampled value of the output voltage, and Δu dc is the predicted voltage ripple.
本发明在步骤105中,将104所预测的输出电压纹波,取反,叠加到注入控制系统的输出电压实时值Udc上,经过电压外环,得到电网电流有功值指令Isd *,抑制输出电压中两倍工频纹波所带来的影响,抑制电网侧电流的三次谐波,经过PI控制、坐标变换得到最终的spwm信号。如图4所示。In step 105 of the present invention, the output voltage ripple predicted in step 104 is reversed, superimposed on the real-time value U dc of the output voltage injected into the control system, and through the voltage outer loop, the grid current active value command I sd * is obtained, suppressing The influence of twice the power frequency ripple in the output voltage suppresses the third harmonic of the grid side current, and the final spwm signal is obtained through PI control and coordinate transformation. As shown in Figure 4.
本发明步骤104中的输出电压中的纹波,为依据电网侧功率波动的所预测的预测值,并非输出电压传感器所采样的实时值。The ripple in the output voltage in step 104 of the present invention is a predicted predicted value based on power fluctuation at the grid side, not a real-time value sampled by the output voltage sensor.
本发明步骤105中所预测的输出电压纹波,取反,叠加到注入控制系统的输出电压实时值上,不必经过低通滤波器,保证了系统的响应速度。The output voltage ripple predicted in step 105 of the present invention is reversed and superimposed on the real-time value of the output voltage of the injection control system without passing through a low-pass filter, thereby ensuring the response speed of the system.
本发明电网电流有功值指令表达式为:The grid current active value instruction expression of the present invention is:
其中,Kp,Ki为PI控制器的参数,s为拉普拉斯算子,Udc *为直流电压指令,Udc为输出电压实时采样值,Δudc为预测的输出电压纹波。Among them, K p and K i are the parameters of the PI controller, s is the Laplacian operator, U dc * is the DC voltage command, U dc is the real-time sampled value of the output voltage, and Δu dc is the predicted output voltage ripple.
本发明提供了一种单相高频脉冲宽度调制PWM整流器输入电流三次谐波抑制方法,通过预测电网的功率波动,预测直流输出电压的纹波情况,将其叠加到传感器所采集的输出电压实时值上,一并送入控制系统,抑制输出电压纹波对控制系统的影响,通过PI控制得到有功电流分量指令值Isd *,抑制单相高频脉冲宽度调制PWM整流器输入电流三次谐波。本发明不依赖于低通滤波器对输出直流电压纹波进行衰减,不会影响系统的带宽,本发明不必新增输出电流传感器,仅从已有数据出发,从算法上做出优化,不用增加硬件成本,对于不同的负载情况均适用,实现了电网电流三次谐波的有效抑制。The invention provides a single-phase high-frequency pulse width modulation PWM rectifier input current third harmonic suppression method, by predicting the power fluctuation of the power grid, predicting the ripple of the DC output voltage, and superimposing it on the output voltage collected by the sensor in real time In terms of values, they are also sent to the control system to suppress the influence of the output voltage ripple on the control system. The active current component command value I sd * is obtained through PI control, and the third harmonic of the input current of the single-phase high-frequency pulse width modulation PWM rectifier is suppressed. The present invention does not depend on the low-pass filter to attenuate the output DC voltage ripple, and will not affect the bandwidth of the system. The hardware cost is suitable for different load conditions, and the effective suppression of the third harmonic of the grid current is realized.
本发明提出了一种单相高频脉冲宽度调制PWM整流器输入电流三次谐波抑制方法,输入电流三次谐波可以减小80%;The invention proposes a single-phase high-frequency pulse width modulation PWM rectifier input current third harmonic suppression method, the input current third harmonic can be reduced by 80%;
本发明提出了一种谐波预测的方法,在预测时使用指令值而非实际采样值进行计算,避免了实际参数中谐波分量的影响。The invention proposes a harmonic prediction method, which uses command values instead of actual sampling values for calculation during prediction, and avoids the influence of harmonic components in actual parameters.
本发明提供一种计算机可读存储介质,计算机可读存储介质存储有计算机程序,计算机程序用于执行上述一种单相桥式整流器输入电流三次谐波抑制的方法。The present invention provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and the computer program is used to implement the above-mentioned method for suppressing the third harmonic of the input current of a single-phase bridge rectifier.
本发明提供一种电子设备,电子设备包括:处理器和存储器;其中,The present invention provides an electronic device, and the electronic device includes: a processor and a memory; wherein,
存储器,用于存储处理器可执行指令的存储器;memory for storing processor-executable instructions;
处理器,用于从存储器中读取可执行指令,并执行指令以实现上述一种单相桥式整流器输入电流三次谐波抑制的方法。The processor is used for reading executable instructions from the memory, and executing the instructions to realize the above-mentioned method for suppressing the third harmonic of the input current of a single-phase bridge rectifier.
图7为根据本发明优选实施方式的一种单相桥式整流器输入电流三次谐波抑制系统结构图。Fig. 7 is a structural diagram of a third harmonic suppression system for input current of a single-phase bridge rectifier according to a preferred embodiment of the present invention.
如图7所示,本发明提供一种单相桥式整流器输入电流三次谐波抑制系统,所述系统包括:As shown in Figure 7, the present invention provides a single-phase bridge rectifier input current third harmonic suppression system, said system comprising:
初始单元701,用于采集电网的电压实时值us,并计算电压幅值Usm;The initial unit 701 is used to collect the real-time value u s of the grid voltage and calculate the voltage amplitude U sm ;
执行单元702,用于基于所述电压实时值us通过锁相环,获取电网的电压矢量角θ;基于所述电压矢量角θ,生成余弦信号cosθ;基于预设的输出直流电压指令Udc *,经过电压外环控制环路得到电网有功电流指令Isd *;基于所述电压幅值Usm、所述余弦信号cosθ以及所述电网有功电流指令Isd *对电网功率波动进行预测;基于预测的电网功率波动,结合单相脉冲宽度调制PWM整流器的硬件参数,预测输出电压中的电压波纹;The execution unit 702 is used to obtain the voltage vector angle θ of the power grid through a phase-locked loop based on the real-time voltage value u s ; generate a cosine signal cosθ based on the voltage vector angle θ; output a DC voltage command U dc based on a preset * , the grid active current command I sd * is obtained through the voltage outer loop control loop; the grid power fluctuation is predicted based on the voltage amplitude U sm , the cosine signal cosθ and the grid active current command I sd * ; The predicted grid power fluctuation, combined with the hardware parameters of the single-phase pulse width modulation PWM rectifier, predicts the voltage ripple in the output voltage;
优选地,预测的电网功率波动为:Preferably, the predicted grid power fluctuation is:
其中,ps为电网的实时功率,θ=ωt,ω为电网电压角频率,t为时间,Δps为功率的波动分量。Among them, p s is the real-time power of the power grid, θ=ωt, ω is the angular frequency of the grid voltage, t is time, and Δps is the fluctuation component of power.
优选地,预测输出电压中的电压波纹为:Preferably, the voltage ripple in the predicted output voltage is:
其中,θ=ωt,ω为电网电压角频率,t为时间,Udc *为输出电压指令值,C为单相脉冲宽度调制PWM整流器的输出滤波电容。Among them, θ=ωt, ω is the grid voltage angular frequency, t is time, U dc * is the output voltage command value, C is the output filter capacitor of the single-phase pulse width modulation PWM rectifier.
优选地,所述电网电流有功值指令Isd *为:Preferably, the grid current active value command I sd * is:
其中,Kp,Ki为PI控制器的参数,s为拉普拉斯算子,Udc *为直流电压指令,Udc为输出电压实时采样值,Δudc为预测的电压纹波。Among them, K p and K i are the parameters of the PI controller, s is the Laplacian operator, U dc * is the DC voltage command, U dc is the real-time sampled value of the output voltage, and Δu dc is the predicted voltage ripple.
结果单元703,用于对所述电压纹波叠加至控制系统的输出电压实时值Udc,经过电压外环,获取电网电流有功值指令Isd *;基于所述电网电流有功值指令Isd *对单相脉冲宽度调制PWM整流器的输入电流三次谐波进行抑制。The result unit 703 is used to superimpose the voltage ripple on the real-time value U dc of the output voltage of the control system, and obtain the grid current active value command I sd * through the voltage outer loop; based on the grid current active value command I sd * The third harmonic of the input current of the single-phase pulse width modulation PWM rectifier is suppressed.
优选地,所述执行单元702,用于基于所述电压实时值us,通过锁相环,获取电网电压的矢量角θ,包括:Preferably, the execution unit 702 is configured to obtain the vector angle θ of the grid voltage through a phase-locked loop based on the real-time voltage value u s , including:
将电压实时值us映射到两相静止坐标系得到usα,将电压实时值us延迟90°得到usβ,将usα、usβ进行坐标变换得到两相旋转坐标系的usd、usq;经控制系统将usq控制为0,加上314rad/s的速度前馈,通过积分获取电网电压的矢量角θ。Map the real-time voltage value u s to the two-phase stationary coordinate system to get u sα , delay the real-time voltage value u s by 90° to get u sβ , and transform u sα and u sβ to get u sd , u in the two-phase rotating coordinate system sq ; u sq is controlled to 0 by the control system, and the speed feedforward of 314rad/s is added, and the vector angle θ of the grid voltage is obtained through integration.
本发明提供一种单相桥式整流器输入电流三次谐波抑制系统与本发明提供一种单相桥式整流器输入电流三次谐波抑制方法相对应,在此不再进行赘述。The present invention provides a single-phase bridge rectifier input current third harmonic suppression system corresponding to the present invention provides a single-phase bridge rectifier input current third harmonic suppression method, which will not be repeated here.
本领域内的技术人员应明白,本发明的实施例可提供为方法、系统、或计算机程序产品。因此,本发明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,本发明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。本发明实施例中的方案可以采用各种计算机语言实现,例如,面向对象的程序设计语言Java和直译式脚本语言JavaScript等。Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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. The solutions in the embodiments of the present invention can be realized by using various computer languages, for example, the object-oriented programming language Java and the literal translation scripting language JavaScript.
本发明是参照根据本发明实施例的方法、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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the 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 operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.
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 onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
已经通过参考少量实施方式描述了本发明。然而,本领域技术人员所公知的,正如附带的专利权利要求所限定的,除了本发明以上公开的其他的实施例等同地落在本发明的范围内。The invention has been described with reference to a small number of embodiments. However, it is clear to a person skilled in the art that other embodiments than the invention disclosed above are equally within the scope of the invention, as defined by the appended patent claims.
通常地,在权利要求中使用的所有术语都根据他们在技术领域的通常含义被解释,除非在其中被另外明确地定义。所有的参考“一个/所述/该[装置、组件等]”都被开放地解释为所述装置、组件等中的至少一个实例,除非另外明确地说明。这里公开的任何方法的步骤都没必要以公开的准确的顺序运行,除非明确地说明。Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/the/the [means, component, etc.]" are openly construed to mean at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
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