CN113991755A - Self-synchronizing voltage source control method for new energy power generation unit - Google Patents

Self-synchronizing voltage source control method for new energy power generation unit Download PDF

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CN113991755A
CN113991755A CN202111223621.2A CN202111223621A CN113991755A CN 113991755 A CN113991755 A CN 113991755A CN 202111223621 A CN202111223621 A CN 202111223621A CN 113991755 A CN113991755 A CN 113991755A
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grid
new energy
self
voltage
power
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CN113991755B (en
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柳丹
冀肖彤
梅欣
邓万婷
王伟
陈孝明
江克证
熊平
康逸群
叶畅
胡畔
肖繁
曹侃
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State Grid Hubei Electric Power Co Ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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State Grid Hubei Electric Power Co Ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

The invention provides a self-synchronizing voltage source control method of a new energy power generation unit, which comprises the following steps: the new energy power generation unit provides a frequency and voltage active support control method with a self-synchronizing characteristic according to the active power and the reactive power of the system; and then, an impedance adaptation algorithm is adopted to adjust the impedance characteristic between the internal potential with the self-synchronization characteristic and the grid-connected point voltage, a current instruction algorithm of a self-synchronization voltage source is given, and finally a current closed-loop control algorithm is given in a three-phase coordinate system, so that the new energy power generation unit controls the voltage and simultaneously considers the improvement of the grid-connected current performance, and the overall performance of the new energy power generation unit is improved.

Description

Self-synchronizing voltage source control method for new energy power generation unit
Technical Field
The invention relates to the field of control of new energy grid-connected inverters, in particular to a control method of a self-synchronizing voltage source of a new energy power generation unit.
Background
Under the two carbon background, the transformation of energy structure will bring the great change of electric wire netting structure certainly, and traditional electric wire netting will demonstrate the high power electronization gradually and the high pair of high characteristics of high proportion new forms of energy access, and future electric power system will demonstrate the novel electric power system characteristic with the new forms of energy as the theme. However, large-scale new energy power generation naturally has randomness, weak support and low immunity, weakens the active support capability and the frequency regulation capability of node voltage, and increases the risk of safe and stable operation of a power grid. Meanwhile, the large amount of new energy is accessed, so that the interactive coupling between the power electronic equipment and the power grid, between the converters and between the subnets seriously influences the reliable consumption of the new energy and the stable operation of the system. Therefore, the active support technology and the system stable operation control method under the high-proportion penetration of the new energy are deeply researched, and the method has important significance for a new energy power system.
In recent years, experts and scholars at home and abroad discuss the control problem of high-proportion access of new energy to a power grid from different angles, and meanwhile, new grid-connected standards also put higher requirements on the supporting capacity of a new energy power generation unit, and technologies such as active/reactive droop control and self-synchronous voltage source control are continuously applied. When the self-synchronizing voltage source is in grid-connected operation, certain support needs to be carried out on the voltage and frequency stability of a power grid, and the waveform quality of the new energy large-scale grid connection is ensured.
In order to solve the problems, experts and scholars at home and abroad provide methods which mainly comprise the following steps:
the chinese patent application (CN112350365A) entitled "a method for improving self-synchronous control of an inertia response effect of a wind turbine generator" provides an active support technology for obtaining an internal potential frequency reference value according to damping power to adjust a system frequency, however, this method cannot adjust an impedance characteristic between a power grid and a new energy power generation unit, cannot control grid-connected current performance, and brings a certain difficulty to a large-scale grid-connected application of new energy.
The technical scheme disclosed by the Chinese patent application specification (CN113346522A) entitled self-adaptive control method and system of self-synchronous voltage source based on rotational inertia provides a self-adaptive control function determination self-adaptive control strategy of rotational inertia, which can improve the characteristics of the rotational inertia of the self-synchronous voltage source under different power grid states and distribute the adjustment quantity of the rotational inertia to each self-synchronous voltage source according to the capacity ratio of the self-synchronous voltage source. The method can adaptively change the moment of inertia, but the control method is complex and cannot ensure the grid-connected current quality.
The Chinese patent application (CN112821460A) entitled self-synchronous voltage source wind turbine generator with synchronous generator supporting grid operation gives a dynamic compensation algorithm to enable the wind energy utilization efficiency and inertia response effect to be optimal, and simultaneously gives a consistency algorithm to control the voltage stability in the off-grid switching process, the control method is complex, and the current control performance cannot be considered.
In a word, the control capability of both voltage source control and current performance is difficult to be considered under the grid-connected mode of the existing VSG technology, and improvement of self-synchronizing voltage source grid-connected current performance under the complex grid condition is not facilitated.
Disclosure of Invention
The invention provides a control method for a self-synchronous voltage source of a new energy power generation unit, aiming at solving the technical problems of active support of the self-synchronous voltage source and improvement of grid-connected current performance in a VSG (voltage source grid) technology grid-connected mode and the like in order to overcome the limitations of various technical schemes.
The invention aims to realize the purpose, and provides a self-synchronizing voltage source control method of a new energy power generation unit, which comprises the following steps:
step 1, sampling and coordinate transformation;
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage uca,ucb,uccBridge arm side induction current i of new energy grid-connected inverterLa,iLb,iLcGrid-connected point voltage u of new energy grid-connected inverteroa,uob,uocGrid-connected point current i of new energy grid-connected inverteroa,iob,ioc；
The coordinate transformation includes coordinate transformation of: for new energy grid-connected inverter filter capacitor voltage uca,ucb,uccAnd dot-on-dot current ioa,iob,iocRespectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltagecd,UcqAnd dq component I of the grid-connected point currentod,Ioq；
Step 2, according to the dq component U of the filter capacitor voltage obtained in the step 1cd,UcqAnd dq component I of the grid-connected point currentod,IoqObtaining an average active power P and an average reactive power Q through an active power calculation equation and a reactive power calculation equation;
step 3, according to the average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter0Giving active power instruction P to new energy grid-connected inverter0Nominal angular frequency of time omega0Obtaining angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and obtaining a vector angle theta of the self-synchronizing voltage source by integrating omega;
step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter0New energy grid-connected inverter given reactive power instruction Q0Rated voltage U of time0Obtaining a terminal voltage amplitude instruction E of a self-synchronizing voltage source through a reactive power control equation*According to the vector angle theta of the self-synchronizing voltage source and the terminal voltage amplitude instruction E obtained in the step 3*Obtaining three-phase terminal voltage instruction of self-synchronizing voltage source through instruction synthesis equation
Figure RE-GDA0003395530320000031
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in the step 4
Figure RE-GDA0003395530320000041
And the grid-connected point power grid voltage u obtained in the step 1oa,uob,uocObtaining a current command signal by a virtual impedance control equation
Figure RE-GDA0003395530320000042
Then according to the current command signal
Figure RE-GDA0003395530320000043
Bridge arm side inductive current i in step 1La,iLb,iLcObtaining the control signal u by a current control equationa,ub,ucThen according to ua,ub,ucAnd generating a PWM control signal of the switching tube.
Preferably, the step of calculating the average active power P and the average reactive power Q in step 2 includes:
the calculation equation of the average active power P is as follows:
Figure RE-GDA0003395530320000044
the calculation equation of the average reactive power Q is as follows:
Figure RE-GDA0003395530320000045
wherein Q ispqCalculating an equation quality factor, ω, for powerhThe harmonic angular frequency to be filtered by the trap filter is s is a Laplace operator, tau is a time constant of a first-order low-pass filter, and h is the harmonic frequency to be filtered.
Preferably, the power angle control equation in step 3 is:
Figure RE-GDA0003395530320000046
wherein m is the droop coefficient of power angle control, J is the virtual inertia of simulation synchronous generator unit, and s is the Laplace operator.
Preferably, the reactive power control equation in step 4 is:
E*＝U0+n(Q0-Q)
wherein n is a reactive-voltage droop coefficient.
Preferably, the three-phase terminal voltage command synthesis equation in step 4 is:
Figure RE-GDA0003395530320000051
Figure RE-GDA0003395530320000052
Figure RE-GDA0003395530320000053
preferably, the virtual impedance control equation in step 5 is:
Figure RE-GDA0003395530320000054
Figure RE-GDA0003395530320000055
Figure RE-GDA0003395530320000056
wherein R isvIs a virtual resistance, LvIs a virtual inductor.
Preferably, the current control equation in step 5 is:
Figure RE-GDA0003395530320000057
Figure RE-GDA0003395530320000058
Figure RE-GDA0003395530320000059
wherein, KpAs a current loop proportional control coefficient, KiProportional coefficient of current loop integral controller, KriCurrent loop resonant controller proportionality coefficient, QiIs the current loop quasi-resonant regulator quality factor.
After the invention is adopted, the new energy grid-connected inverter adopting the self-synchronous voltage source technology has the following advantages:
1. the impedance adaptation between the new energy power generation unit and a large power grid can be realized;
2. the grid-connected current performance is improved while the self-synchronizing voltage source supporting technology of the new energy power generation unit is realized.
Drawings
FIG. 1 is a topology of a new energy grid-connected inverter based on a self-synchronizing voltage source according to the present invention;
FIG. 2 is a control block diagram of the self-synchronizing voltage source of the new energy power generation unit of the present invention;
FIG. 3 is a waveform diagram of an active power simulation in an embodiment of the present invention;
FIG. 4 is a waveform of a grid-connected point voltage simulation in an embodiment of the present invention;
fig. 5 is a waveform diagram of dot-on current simulation in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a topology of a new energy grid-connected inverter based on a self-synchronous voltage source in an embodiment of the present invention. The topology of the new energy grid-connected inverter comprises a direct current source UdcDC side filter capacitor CdcThree-phase full-bridge inverter circuit, filter inductor L, filter capacitor C and grid-connected equivalent resistor RgGrid-connected equivalent inductor LgThree-phase network ea、eb、ecFilter capacitor C on the DC sidedcConnected in parallel to a direct current source UdcAnd a three-phase full-bridge inverter circuit connected in series with the DC side power supply UdcBetween the filter capacitor C and the filter inductor L, the filter capacitor C is connected in series with the passive damping resistor RcAnd then connected in parallel with the filter inductor L and the grid-connected equivalent resistor RgBetween, parallel to the grid equivalentInductor LgConnected in series with a grid-connected equivalent resistor RgAnd a three-phase network ea、eb、ecIn the meantime.
Specifically, the parameters in this embodiment are as follows: DC bus voltage Udc650V, an effective value of an output alternating current line voltage of 380V/50Hz, a rated capacity of 100kW, a filter inductance L of the new energy grid-connected inverter of 0.3mH, a filter capacitance C of the new energy grid-connected inverter of 200 mu F, and a sampling frequency F of the new energy grid-connected invertersIs 10kHz, thus Ts＝100μs。
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for controlling a self-synchronous voltage source of a new energy power generation unit, including the following steps:
step 1, sampling and coordinate transformation;
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage uca,ucb,uccBridge arm side induction current i of new energy grid-connected inverterLa,iLb,iLcGrid-connected point voltage u of new energy grid-connected inverteroa,uob,uocGrid-connected point current i of new energy grid-connected inverteroa,iob,ioc。
The coordinate transformation includes coordinate transformation of: for new energy grid-connected inverter filter capacitor voltage uca,ucb,uccAnd dot-on-dot current ioa,iob,iocRespectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltagecd,UcqDq component I of bridge arm side inductor currentLd,ILqAnd dq component I of the grid-connected point currentod,Ioq。
Step 2, according to the dq component U of the filter capacitor voltage obtained in the step 1cd,UcqAnd dq component I of the grid-connected point currentod,IoqAnd obtaining the average active power P and the average reactive power Q through an active power calculation equation and a reactive power calculation equation.
The active power calculation equation is as follows:
Figure RE-GDA0003395530320000071
the reactive power calculation equation is as follows:
Figure RE-GDA0003395530320000072
wherein Q ispqComputing equation quality factor, omega, for powerhThe harmonic angular frequency to be filtered by the trap filter is set as s, the Laplace operator is set as s, the time constant of the first-order low-pass filter is set as tau, and the harmonic frequency to be filtered is set as h.
In this embodiment, the number of harmonics to be mainly filtered is considered to be 2 and 3, so h is 2,3, where ω ish628.3186rad/s,942.4779 rad/s. The first-order low-pass filter mainly considers filtering higher harmonics without influencing dynamic response, and generally takes tau less than or equal to 2e-3s, the value τ being 1.5e in this example-4s; quality factor QpqMainly considering the filtering effect of the trap, in this example, Q is selectedpq＝0.5。
Step 3, according to the average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter0Giving active power instruction P to new energy grid-connected inverter0Nominal angular frequency of time omega0And obtaining the angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and integrating the omega to obtain the vector angle theta of the self-synchronizing voltage source.
The power angle control equation is as follows:
Figure RE-GDA0003395530320000081
wherein m is the droop coefficient of power angle control, J is the virtual inertia of simulation synchronous generator unit, and s is the Laplace operator.
The power angle control equation shows the active power droop curve relation and the virtual inertia of the new energy grid-connected inverter.The virtual inertia indicates the change rate of the system frequency, and a larger virtual inertia is needed to ensure the stable change of the system frequency; however, the virtual inertia is equivalent to adding a first-order inertia element in the system, and too large virtual inertia may cause instability of the system. Thus, the parameter selection requires a compromise process. In order to ensure the stability of the system, the inertia time constant is in a range of tauvirtual＝Jω0m≤2e-3s; . The active power droop curve relation in the power angle control equation comprises three coefficients, the power angle control droop coefficient m represents the slope of the droop curve, and the value principle is that when the active power changes by 100%, the frequency changes within 0.5 Hz; given active power command P0And corresponding nominal angular frequency omega0The position relation of a droop curve is represented, and the active power output by the new energy grid-connected inverter is mainly considered to be P0Its output frequency is large or small.
In this embodiment, the droop coefficient of power angle control takes the value of
Figure RE-GDA0003395530320000091
Taking tau according to the principle of inertia time constant valuevirtual＝Jω0m＝1.5e-3s, can obtain J as 0.2kg m2In order to ensure that the energy does not flow to the direct current side during the control operation, the value of the active power instruction is given as P0100kW, the corresponding rated angular frequency is omega0＝314.1593rad/s。
Step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter0New energy grid-connected inverter given reactive power instruction Q0Rated voltage U of time0Obtaining a terminal voltage amplitude instruction E of a self-synchronizing voltage source through a reactive power control equation*According to the vector angle theta of the self-synchronizing voltage source and the terminal voltage amplitude instruction E obtained in the step 3*Obtaining three-phase terminal voltage instruction of self-synchronizing voltage source through instruction synthesis equation
Figure RE-GDA0003395530320000092
The reactive power control equation is as follows:
U*＝U0+n(Q0-Q)
wherein, U0Giving reactive power instruction Q for new energy grid-connected inverter0The rated output capacitor voltage n is the reactive-voltage droop coefficient.
The three-phase terminal voltage instruction synthesis equation is as follows:
Figure RE-GDA0003395530320000093
Figure RE-GDA0003395530320000094
Figure RE-GDA0003395530320000095
when the reactive power-voltage droop coefficient n is changed in a reactive power mode with the value principle of 100%, the voltage amplitude is changed within 2%; given reactive power command Q0And corresponding rated output capacitor voltage U0The position relation of a droop curve is shown, and the output reactive power of the new energy grid-connected inverter is mainly considered to be Q0When the voltage is high, the output voltage is large.
In this embodiment, the reactive-voltage droop coefficient takes the value of
Figure RE-GDA0003395530320000101
Giving a reactive power command of Q0When it is 0, the corresponding rated output capacitor voltage U0＝380V。
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in the step 4
Figure RE-GDA0003395530320000102
And the grid-connected point power grid voltage u obtained in the step 1oa,uob,uocObtaining a current command signal by a virtual impedance control equation
Figure RE-GDA0003395530320000103
Then according to the current command signal
Figure RE-GDA0003395530320000104
Bridge arm side inductive current i in step 1La,iLb,iLcObtaining the control signal u by a current control equationa,ub,ucThen according to ua,ub,ucAnd generating a PWM control signal of the switching tube.
The virtual impedance control equation is:
Figure RE-GDA0003395530320000105
Figure RE-GDA0003395530320000106
Figure RE-GDA0003395530320000107
wherein R isvIs a virtual resistance, LvIs a virtual inductor.
The current control equation is:
Figure RE-GDA0003395530320000108
Figure RE-GDA0003395530320000109
Figure RE-GDA00033955303200001010
wherein, KpAs a current loop proportional control coefficient, KiProportional coefficient of current loop integral controller, KriCurrent loop resonant controller proportionality coefficient, QiIs the current loop quasi-resonant regulator quality factor.
In this embodiment, the value of the dummy resistance is Rv0.01 omega, the virtual inductance takes the value of Lv0.22mH, and K is the proportional control coefficient of current loop p1, the proportional coefficient of the current loop integral controller is Ki10. The quasi-resonance regulator mainly considers eliminating DC component and quality factor Q in the systemiMainly considering the gain and stability of the resonant regulator, in this example, Q is choseni0.7; the proportional coefficient of the quasi-resonance controller comprehensively considers the direct-current component inhibition capability and the system stability of the current loop, and in the example, K is selectedri＝50。
In order to prove the technical effect of the invention, simulation is carried out on the embodiment of the invention.
Fig. 3, 4, and 5 show an active power waveform, a grid-connected point voltage waveform, and a grid-connected point current waveform of the new energy power generation unit in the case of a weak grid (short-circuit ratio SCR is 1.5), respectively. As can be seen from fig. 3, according to the self-synchronizing voltage source control method for the new energy power generation unit provided by the invention, the active power P can quickly and correctly track the active power command P0The system can send out rated active power of 100 kW; as can be seen from fig. 4 and 5, the self-synchronous voltage source control method for the new energy power generation unit provided by the invention can ensure that the grid-connected point voltage and the grid-connected point current are stable and three-phase symmetric, and the system operates stably.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A new energy power generation unit self-synchronizing voltage source control method is provided, wherein the new energy grid-connected inversion method based on the self-synchronizing voltage sourceThe topology of the device comprises a direct current source UdcDC side filter capacitor CdcThree-phase full-bridge inverter circuit, filter inductor L, filter capacitor C and grid-connected equivalent resistor RgGrid-connected equivalent inductor LgThree-phase network ea、eb、ecFilter capacitor C on the DC sidedcConnected in parallel to a direct current source UdcAnd a three-phase full-bridge inverter circuit connected in series with the DC side power supply UdcBetween the filter capacitor C and the filter inductor L, the filter capacitor C is connected in series with the passive damping resistor RcAnd then connected in parallel with the filter inductor L and the grid-connected equivalent resistor RgEquivalent inductance L of grid connectiongConnected in series with a grid-connected equivalent resistor RgAnd a three-phase network ea、eb、ecTo (c) to (d);
characterized in that the method comprises the following steps:
step 1, sampling and coordinate transformation;
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage uca,ucb,uccBridge arm side induction current i of new energy grid-connected inverterLa,iLb,iLcGrid-connected point voltage u of new energy grid-connected inverteroa,uob,uocGrid-connected point current i of new energy grid-connected inverteroa,iob,ioc；
The coordinate transformation includes coordinate transformation of: for new energy grid-connected inverter filter capacitor voltage uca,ucb,uccAnd dot-on-dot current ioa,iob,iocRespectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltagecd,UcqAnd dq component I of the grid-connected point currentod,Ioq；
Step 2, according to the dq component U of the filter capacitor voltage obtained in the step 1cd,UcqAnd dq component I of the grid-connected point currentod,IoqObtaining an average active power P and an average reactive power Q through an active power calculation equation and a reactive power calculation equation;
step 3, according toThe average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter0Giving active power instruction P to new energy grid-connected inverter0Nominal angular frequency of time omega0Obtaining angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and obtaining a vector angle theta of the self-synchronizing voltage source by integrating omega;
step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter0New energy grid-connected inverter given reactive power instruction Q0Rated voltage U of time0Obtaining a terminal voltage amplitude instruction E of a self-synchronizing voltage source through a reactive power control equation*According to the vector angle theta of the self-synchronizing voltage source and the terminal voltage amplitude instruction E obtained in the step 3*Obtaining three-phase terminal voltage instruction of self-synchronizing voltage source through instruction synthesis equation
Figure FDA0003313490220000021
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in the step 4
Figure FDA0003313490220000022
And the grid-connected point power grid voltage u obtained in the step 1oa,uob,uocObtaining a current command signal by a virtual impedance control equation
Figure FDA0003313490220000023
Then according to the current command signal
Figure FDA0003313490220000024
Bridge arm side inductive current i in step 1La,iLb,iLcObtaining the control signal u by a current control equationa,ub,ucThen according to ua,ub,ucAnd generating a PWM control signal of the switching tube.
2. The self-synchronous voltage source control method of the new energy power generation unit according to claim 1, wherein the calculating of the average active power P and the average reactive power Q in step 2 comprises:
the calculation equation of the average active power P is as follows:
Figure FDA0003313490220000025
the calculation equation for the average reactive power Q is:
Figure FDA0003313490220000026
wherein Q ispqCalculating an equation quality factor, ω, for powerhThe harmonic angular frequency to be filtered by the trap filter is s is a Laplace operator, tau is a time constant of a first-order low-pass filter, and h is the harmonic frequency to be filtered.
3. The method for controlling the self-synchronous voltage source of the new energy power generation unit according to claim 1, wherein the power angle control equation in step 3 is as follows:
Figure FDA0003313490220000031
wherein m is the droop coefficient of power angle control, J is the virtual inertia of simulation synchronous generator unit, and s is the Laplace operator.
4. The self-synchronous voltage source control method of the new energy power generation unit according to claim 1, wherein the reactive control equation in step 4 is:
E*＝U0+n(Q0-Q)
wherein n is a reactive-voltage droop coefficient.
5. The self-synchronous voltage source control method of the new energy power generation unit according to claim 1, wherein the three-phase voltage command synthesis equation in step 4 is as follows:
Figure FDA0003313490220000032
Figure FDA0003313490220000033
Figure FDA0003313490220000034
6. the self-synchronous voltage source control method of the new energy power generation unit according to claim 1, wherein the virtual impedance control equation in step 5 is:
Figure FDA0003313490220000035
Figure FDA0003313490220000036
Figure FDA0003313490220000037
wherein R isvIs a virtual resistance, LvIs a virtual inductor.
7. The self-synchronous voltage source control method of the new energy power generation unit according to claim 1, wherein the current control equation in step 5 is:
Figure FDA0003313490220000041
Figure FDA0003313490220000042
Figure FDA0003313490220000043
wherein, KpAs a current loop proportional control coefficient, KiProportional coefficient of current loop integral controller, KriCurrent loop resonant controller proportionality coefficient, QiIs the current loop quasi-resonant regulator quality factor.
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