CN109802433A - A kind of gird-connected inverter oscillation of power inhibition system and method - Google Patents

A kind of gird-connected inverter oscillation of power inhibition system and method Download PDF

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CN109802433A
CN109802433A CN201910022829.4A CN201910022829A CN109802433A CN 109802433 A CN109802433 A CN 109802433A CN 201910022829 A CN201910022829 A CN 201910022829A CN 109802433 A CN109802433 A CN 109802433A
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voltage
feedback
oscillation
power
grid
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CN109802433B (en
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孙建军
汪春江
查晓明
潘静
曹志煌
徐斌
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Wuhan University WHU
State Grid Anhui Electric Power Co Ltd
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State Grid Anhui Electric Power Co Ltd
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Abstract

The present invention relates to electricity fields, inhibit system and method more particularly to a kind of gird-connected inverter oscillation of power, the present invention passes through feedback DC voltage micro component to corresponding controlling unit, and carry out corresponding feedback parameter configuration, realize the inhibition to grid-connected system oscillation of power, greatly promotion grid adaptability range and control parameter domain.The invention not only significant effect, and structure is simple, does not increase other external hardware costs, is applicable in the weak grid in larger range, and have stronger robustness for control ring parameter perturbation.

Description

A kind of gird-connected inverter oscillation of power inhibition system and method
Technical field
The present invention relates to electricity fields, and in particular to a kind of gird-connected inverter oscillation of power inhibition system and method.
Background technique
Restrainable algorithms common for grid-connected inverters system oscillation at present include: lead-lag penalty method, virtual impedance Method, self adaptive control etc..Lead-lag penalty method is to pass through design by the way that lead-lag compensator is added in inverter current ring The time constant of lead-lag promotes closed-loop system Phase margin, to achieve the effect that improving stability inhibits oscillation.This The kind most important problem of method is that parameter designing is too complicated, and lead-lag calculating will unavoidably reduce control response speed, only It works for a certain specific power grid；Virtual impedance rule is by feedback communication voltage and current to form virtual resistance It is anti-, Phase margin is promoted to inhibit to vibrate.The problem of this method, is also that parameter designing is too complicated, and just for a certain specific electricity Net works；Self adaptive control is to be used to generate alternating voltage by real-time measurement electric network impedance and by its parameter, thus sharp Feedovered the influence for weakening electric network impedance variation to inverter control with alternating voltage, is inhibited by electric network impedance variation bring oscillation Problem.The problem of this method is to need to introduce additional Current Voltage sensor, increases the hardware cost of inverter, secondly Computing impedance will also decrease control response speed etc..
Summary of the invention
Control algolithm proposed by the present invention is the gird-connected inverter oscillation of power based on inverter direct-current voltage Derivative Feedback Inhibit strategy.
A kind of gird-connected inverter oscillation of power inhibition system, which is characterized in that a Voltage Feedback dress is added in DC side It sets, the voltage feedback device is for measuring DC voltage instantaneous value and feeding back to Voltage loop and electric current loop input.
Inhibit system in a kind of above-mentioned gird-connected inverter oscillation of power, the voltage feedback device includes:
Resistance pressure-dividing network is made of resistance and measuring probe, for measuring DC voltage instantaneous value；
Sampling filter module, is made of filter circuit, for carrying out low pass sampling filter to the DC voltage of measurement；
Scale operation module is made of two voltage followers, for carrying out scale operation to the signal after sampling, and is divided Voltage loop and electric current loop input are not fed back to；
It differentiates module, is made of amplifier circuit, for two-way feedback signal to be differentiated, obtains to the end Feedback signal.
A kind of gird-connected inverter oscillation of power suppressing method, which is characterized in that
Step 1, selection feedback DC voltage micro component to Voltage loop input, and analyze Physical Mechanism, are equivalent in DC side It connects a resistance, oscillation energy is consumed by virtual resistance.
DC capacitor voltage differential is fed back to electric current loop input by step 2 again, and effect is by DC current by differential ring DC voltage instruction value is fed back to again after section and proportional component are in parallel, is equivalent to and is connected a resistance and inductance in DC side, one Aspect changes the frequency of oscillation of system, reduces oscillation risks；On the other hand, oscillation energy is by series connection virtual resistance " consumption ".
In a kind of above-mentioned gird-connected inverter oscillation of power suppressing method, the specific method of feedback is:
Step 1, selection feedback variable；
According to instantaneous power theory, inverter alternating current-direct current side meets instantaneous power equilibrium relation:
Pin+Pdc=Pout (1)
Small signalling processing is carried out to formula (1):
The essence of oscillation of power is that the increase of electric network impedance reduces the damping action of grid-connected inverter system, so that system Inverter input-output power deviation is difficult to balance in a short time after being disturbed.By formula (2) it is found that under microvariations, Inverter input-output power deviation and DC voltage micro component are proportional, and the essence of active damping is to system oscillation frequency The feedback control of corresponding scale variable.To sum up, system power oscillation is carried out inhibiting to select DC voltage micro component as feedback Variable.
Step 2, selection feedback introduction point, including Voltage loop input and electric current loop input.
In oscillatory process, it is believed that phaselocked loop can track exchange side phase always and grid-connected current can follow grid-connected electricity always Instruction value is flowed, tracking process is equivalent with Proportional coefficient K eqi, while ignoring dq axis coupling effect, only considers d axis active power. Feedback variable can be fed back to Voltage loop input, by attached drawing 3 it is found that by changing control block diagram interior joint position, it was therefore concluded that DC side reference voltage after feedback is that a value composition is subtracted on the basis of former reference voltage, which can be multiplied by DC current One coefficient composition relevant with feedback factor and DC capacitor, this coefficient is virtual resistance.Therefore, the physics of feedback effect Mechanism is equivalent in DC side one resistance of series connection, and the energy of oscillation is by virtual resistance " consumption ".
Feedback variable is fed back into electric current loop input, passes through successively concept transfer position and summing junction position, it was therefore concluded that DC side reference voltage after feedback is that a value composition is subtracted on the basis of former reference voltage, which can be multiplied by DC current One coefficient composition relevant to the PI parameter of DC voltage control, DC capacitor, feedback factor, further carries out the coefficient Fortran, it is concluded that the coefficient is composed in parallel by a proportional component and a differentiation element, proportional component and differential ring The i.e. corresponding virtual resistance of section and virtual inductor.Therefore, the Physical Mechanism of feedback effect is in one resistance of DC side series connection and electricity On the one hand sense changes the frequency of oscillation of system, reduce oscillation risks；On the other hand, oscillation energy " is disappeared by concatenated virtual resistance Consumption ".
The present invention is carried out corresponding feedback parameter and is matched by feedback DC voltage micro component to corresponding controlling unit It sets, realizes the inhibition to grid-connected system oscillation of power, greatly promotion grid adaptability range and control parameter domain.The invention is not Only significant effect, and structure is simple, does not increase other external hardware costs, is applicable in the weak grid in larger range, and right There is stronger robustness in control ring parameter perturbation.
Detailed description of the invention:
Fig. 1 is inverter topology of the present invention and traditional control algorithm.
Fig. 2 is that oscillation of power of the present invention inhibits policy control block diagram.
Fig. 3 is the block diagram conversion process that feedback variable to Voltage loop inputs.
Fig. 4 is the block diagram conversion process that feedback variable to electric current loop inputs.
Fig. 5 is that oscillation of power of the present invention inhibits policy control block diagram.
Fig. 6 is experimental prototype figure of the present invention.
Experimental result when Fig. 7 is power grid inductance 2.5mH under Traditional control of the present invention.
Fig. 8 is using the experimental result after inventive control algorithm when power grid inductance 2.5mH.
Fig. 9 is using the experimental result after inventive control algorithm when power grid inductance 10mH.
Specific embodiment
The present invention is understood and implemented for the ease of those of ordinary skill in the art, and with reference to the accompanying drawing and example is to the present invention It is described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, and is not had to It is of the invention in limiting.
One, system of the present invention under introducing first.
Mainly a voltage feedback device is added in DC side in the present invention, and the voltage feedback device is for measuring DC side Instantaneous voltage simultaneously feeds back to Voltage loop and electric current loop input.
Voltage feedback device includes:
Resistance pressure-dividing network is made of resistance and measuring probe, for measuring DC voltage instantaneous value；
Sampling filter module, is made of filter circuit, for carrying out low pass sampling filter to the DC voltage of measurement；
Scale operation module is made of two voltage followers, for carrying out scale operation to the signal after sampling, and is divided Voltage loop and electric current loop input are not fed back to；
It differentiates module, is made of amplifier circuit, for two-way feedback signal to be differentiated, obtains to the end Feedback signal.
Two, the invention further relates to a kind of gird-connected inverter oscillation of power suppressing methods, including
Selection feedback DC voltage micro component to Voltage loop inputs, and analyzes its Physical Mechanism, is equivalent to and connects in DC side One resistance, oscillation energy is by virtual resistance " consumption ".
DC capacitor voltage differential is fed back into electric current loop input again, effect be by DC current by differentiation element and DC voltage instruction value is fed back to again after proportional component is in parallel, this is equivalent in one resistance of DC side series connection and inductance, a side Face changes the frequency of oscillation of system, reduces oscillation risks；On the other hand, oscillation energy is by series connection virtual resistance " consumption ".
The specific method of feedback is:
Step 1, selection feedback variable；
According to instantaneous power theory, inverter alternating current-direct current side meets instantaneous power equilibrium relation:
Pin+Pdc=Pout (1)
Small signalling processing is carried out to formula (1):
The essence of oscillation of power is that the increase of electric network impedance reduces the damping action of grid-connected inverter system, so that system Inverter input-output power deviation is difficult to balance in a short time after being disturbed.By formula (2) it is found that under microvariations, Inverter input-output power deviation and DC voltage micro component are proportional, and the essence of active damping is to system oscillation frequency The feedback control of corresponding scale variable.To sum up, system power oscillation is carried out inhibiting to select DC voltage micro component as feedback Variable.
Step 2, selection feedback introduction point
Inverter topology and traditional control algorithm of the present invention are available as shown in Figure 1, in the control algolithm Introduction point have Voltage loop input and electric current loop input.In oscillatory process, it is believed that phaselocked loop can track exchange side phase always And grid-connected current can follow grid-connected current instruction value, tracking process Proportional coefficient K alwayseqiIt is equivalent, while ignoring dq axis coupling Effect is closed, only considers d axis active power.It is as shown in Figure 2 that the small signal diagram of inverter control structures can be derived.
Feedback variable is fed back into Voltage loop input, is converted by simple block diagram, its available Physical Mechanism, Fig. 3 For block diagram conversion process, which is that DC current is fed back to DC voltage instruction value by proportional component, is equivalent to In DC side one resistance of series connection, the energy of oscillation is by virtual resistance " consumption ".
Feedback variable is fed back into electric current loop input, is converted by block diagram, its Physical Mechanism is obtained, Fig. 4 is corresponding frame Figure conversion process.The feedback effect is that DC current is fed back to DC voltage after differentiation element and proportional component are in parallel again Instruction value is equivalent in one resistance of DC side series connection and inductance, on the one hand changes the frequency of oscillation of system, reduces and vibrate wind Danger；On the other hand, oscillation energy is by concatenated virtual resistance " consumption ".
To sum up, the present invention proposes while inputting the oscillation of power of two kinds of feedbacks comprising being introduced into Voltage loop input and electric current loop Inhibit strategy.Control block diagram is as shown in Figure 5.
It three, is the concrete case for using the systems and methods below.
A 20kW three-phase grid-connected inverter principle prototype has been built herein, as shown in Figure 6.Model machine is with TMS320F28335 As control chip, model machine DC voltage is 800V, and alternating voltage virtual value is 380V.Power tube uses Vishay The NPT module VS-GB100TH120U of Semiconductor company, is sampled using voltage-current sensor.It is straight in experiment It connects using alternating current and inductance and simulates weak grid situation, power grid inductance changes between 2.5mH-10mH.Inverter control algorithm is such as Fig. 1, shown in 5.
Performance analysis:
Biggish power grid inductance Lg=2.5mH is chosen, as control waveform.Obtain experimental result DC voltage and alternating current It is as shown in Figure 7 to flow waveform.Since power grid inductance is sufficiently large, the inverter control parameter based on strong electrical reticulation design and it is not suitable at this time In weak grid, system will generate oscillation of power, and it is about 5Hz that be reacted to DC voltage waveform, which be frequency, amplitude be about 150V etc. Width oscillation.
When power grid inductance is continued to increase, if maintaining traditional control method constant, inverter alternating current-direct current side electricity will be produced Raw oscillation and divergence, leads to system unstability, will cause irremediable damage to experimental prototype, therefore do not carry out this part Experiment.When using oscillation of power active damping strategy proposed by the invention, experimental results are shown in figure 8, DC voltage with simultaneously The oscillation of net electric current decays rapidly, and the fast quick-recovery of system is stablized, and adjustment time is about ts=0.6s.This shows that the present invention proposes Oscillation of power active damping strategy restriction weak grid under system oscillation of power.Fig. 9 is to have selected bulk power grid inductance Lg= The DC voltage and grid-connected current waveform that 10mH is tested.The oscillation of DC voltage and grid-connected current as time goes by and by Degradation subtracts, adjustment time ts=1.6s.This shows that the present invention proposes that control algolithm can significantly promote inverter and adapt to light current Net range.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.

Claims (4)

1.一种并网逆变器功率振荡抑制系统，其特征在于，在直流侧加入一个电压反馈装置，该电压反馈装置用于测量直流侧电压瞬时值并反馈至电压环及电流环输入。1. A grid-connected inverter power oscillation suppression system, characterized in that a voltage feedback device is added to the DC side, and the voltage feedback device is used to measure the instantaneous value of the DC side voltage and feed it back to the voltage loop and current loop input. 2.根据权利要求1所述的一种并网逆变器功率振荡抑制系统，其特征在于，所述电压反馈装置包括：2. The grid-connected inverter power oscillation suppression system according to claim 1, wherein the voltage feedback device comprises: 电阻分压网络，由电阻和测量探头组成，用于测量直流侧电压瞬时值；Resistor voltage divider network, consisting of resistors and measuring probes, is used to measure the instantaneous value of the DC side voltage; 采样滤波模块，由滤波电路组成，用于对测量的直流电压进行低通采样滤波；The sampling filter module is composed of a filter circuit, which is used to perform low-pass sampling and filtering on the measured DC voltage; 比例运算模块，由两个电压跟随器组成，用于对采样后的信号进行比例运算，并分别反馈至电压环和电流环输入；The proportional operation module is composed of two voltage followers, which are used to perform proportional operation on the sampled signal and feed back to the voltage loop and current loop input respectively; 微分运算模块，由放大器电路组成，用于将两路反馈信号进行微分运算，得到最后的反馈信号。The differential operation module is composed of an amplifier circuit, which is used for differential operation of the two feedback signals to obtain the final feedback signal. 3.一种并网逆变器功率振荡抑制方法，其特征在于，3. A method for suppressing power oscillation of a grid-connected inverter, characterized in that, 步骤1、选择反馈直流电压微分量至电压环输入，分析物理机理，等效于在直流侧串联一个电阻，振荡能量由虚拟电阻消耗；Step 1. Select the feedback DC voltage differential component to the voltage loop input, analyze the physical mechanism, which is equivalent to connecting a resistor in series on the DC side, and the oscillation energy is consumed by the virtual resistor; 步骤2、将直流电容电压微分再反馈至电流环输入，作用是将直流电流经过微分环节和比例环节并联后再反馈至直流电压指令值，等效于在直流侧串联一个电阻并电感，一方面改变系统的振荡频率，降低振荡风险；另一方面，振荡能量由串联虚拟电阻“消耗”。Step 2. Feed back the DC capacitor voltage differential to the current loop input. The function is to connect the DC current through the differential link and the proportional link in parallel and then feed back to the DC voltage command value, which is equivalent to connecting a resistor and inductor in series on the DC side. On the one hand, Change the oscillation frequency of the system and reduce the risk of oscillation; on the other hand, the oscillation energy is "consumed" by the series virtual resistor. 4.根据权利要求3所述的一种并网逆变器功率振荡抑制方法，其特征在于，反馈的具体方法是：4. The method for suppressing power oscillation of a grid-connected inverter according to claim 3, wherein the specific method of feedback is: 步骤1、选择反馈变量；Step 1. Select the feedback variable; 根据瞬时功率理论，逆变器交直流侧满足瞬时功率平衡关系：According to the instantaneous power theory, the AC and DC sides of the inverter satisfy the instantaneous power balance relationship: Pin+Pdc＝Pout (1)P in +P dc =P out (1) 对公式(1)进行小信号化处理：Perform small signal processing on formula (1): 功率振荡的本质是电网阻抗的增加降低了并网逆变器系统的阻尼作用，使得系统在受到扰动后逆变器输入输出功率偏差难以在短时间内平衡，由式(2)可知，在小扰动下，逆变器输入输出功率偏差和直流电压微分量成比例，而有源阻尼的实质是对系统振荡频率对应尺度变量的反馈控制，综上，对系统功率振荡进行抑制选择直流电压微分量作为反馈变量；The essence of power oscillation is that the increase of grid impedance reduces the damping effect of the grid-connected inverter system, making it difficult for the inverter input and output power deviation to balance in a short time after the system is disturbed. Under the disturbance, the input and output power deviation of the inverter is proportional to the DC voltage differential component, and the essence of active damping is the feedback control of the scale variable corresponding to the system oscillation frequency. In summary, the DC voltage differential component is selected to suppress the system power oscillation. as a feedback variable; 步骤2、选择反馈引入点，包括电压环输入及电流环输入；Step 2. Select the feedback introduction point, including voltage loop input and current loop input; 在振荡过程中，认为锁相环始终能跟踪交流侧相位且并网电流始终能跟随并网电流指令值，其跟踪过程用比例系数Keqi等效，同时忽略dq轴耦合效应，只考虑d轴有功功率，可将反馈变量反馈至电压环输入，由附图3可知，通过改变控制框图中节点位置，得出结论反馈后的直流侧参考电压是在原参考电压的基础上减去一个值组成，该值可由直流电流乘一个和反馈系数及直流电容相关的系数组成，此系数即为虚拟电阻，因此，反馈作用的物理机理是等效于在直流侧串联一个电阻，振荡的能量由虚拟电阻“消耗”；In the oscillation process, it is considered that the phase-locked loop can always track the phase of the AC side and the grid-connected current can always follow the command value of the grid-connected current. The tracking process is equivalent to the proportional coefficient Keqi, and the coupling effect of the dq axis is ignored, and only the active power of the d axis is considered. power, the feedback variable can be fed back to the voltage loop input. It can be seen from Figure 3 that by changing the node position in the control block diagram, it is concluded that the DC side reference voltage after feedback is composed of the original reference voltage minus a value. The value can be composed of the DC current multiplied by a coefficient related to the feedback coefficient and the DC capacitance. This coefficient is the virtual resistance. Therefore, the physical mechanism of the feedback action is equivalent to connecting a resistance in series on the DC side, and the energy of oscillation is consumed by the virtual resistance. "; 将反馈变量反馈至电流环输入，通过依次改变节点位置及求和点位置，得出结论反馈后的直流侧参考电压是在原参考电压的基础上减去一个值组成，该值可由直流电流乘一个与直流电压控制的PI参数、直流电容、反馈系数相关的系数组成，进一步对该系数进行公式变换，得到结论该系数由一个比例环节及一个微分环节并联组成，比例环节及微分环节即对应虚拟电阻及虚拟电感，因此，反馈作用的物理机理是在直流侧串联一个电阻并电感，一方面改变系统的振荡频率，降低振荡风险；另一方面，振荡能量由串联的虚拟电阻“消耗”。The feedback variable is fed back to the current loop input, and by changing the node position and the summation point position in turn, it is concluded that the DC side reference voltage after feedback is formed by subtracting a value from the original reference voltage, and this value can be multiplied by the DC current. It is composed of coefficients related to the PI parameters of DC voltage control, DC capacitance, and feedback coefficient. The formula is further transformed to this coefficient, and it is concluded that the coefficient is composed of a proportional link and a differential link in parallel, and the proportional link and the differential link correspond to the virtual resistance. Therefore, the physical mechanism of the feedback effect is to connect a resistor and inductor in series on the DC side, on the one hand, it changes the oscillation frequency of the system and reduces the risk of oscillation; on the other hand, the oscillation energy is "consumed" by the virtual resistor in series.
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CN110797915A (en) * 2019-11-13 2020-02-14 国网安徽省电力有限公司 An active frequency control method for photovoltaic power station based on energy storage
CN110797915B (en) * 2019-11-13 2021-01-08 国网安徽省电力有限公司 An active frequency control method for photovoltaic power station based on energy storage
CN111769582A (en) * 2020-06-24 2020-10-13 南京航空航天大学 An additional damping control method for AC current feedback based on multi-terminal DC power distribution system
CN111769582B (en) * 2020-06-24 2021-11-23 南京航空航天大学 Alternating current feedback additional damping control method based on multi-terminal direct current distribution system
CN112014631A (en) * 2020-08-24 2020-12-01 武汉大学 Oscillating power acquisition method and device under grid transient fault
CN112014631B (en) * 2020-08-24 2022-03-22 武汉大学 Oscillating power acquisition method and device under grid transient fault
CN112379153A (en) * 2020-10-30 2021-02-19 阳光电源股份有限公司 Direct current oscillation detection circuit, direct current arc detection circuit and inverter
CN115133551A (en) * 2022-07-07 2022-09-30 扬州大学 Active damping method based on resonance current differentiation and parameter scanning self-adaption
CN115133551B (en) * 2022-07-07 2025-08-12 扬州大学 Active damping method based on resonant current differentiation and parameter scanning self-adaption

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