CN116707341A - Inverter control method and inverter - Google Patents
Inverter control method and inverter Download PDFInfo
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- CN116707341A CN116707341A CN202310681224.2A CN202310681224A CN116707341A CN 116707341 A CN116707341 A CN 116707341A CN 202310681224 A CN202310681224 A CN 202310681224A CN 116707341 A CN116707341 A CN 116707341A
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000008878 coupling Effects 0.000 claims abstract description 95
- 238000010168 coupling process Methods 0.000 claims abstract description 95
- 238000005859 coupling reaction Methods 0.000 claims abstract description 95
- 230000004927 fusion Effects 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 12
- 238000007665 sagging Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 abstract description 9
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
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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
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
Abstract
The invention discloses an inverter control method and an inverter, which can obtain a d-axis voltage command signal, a dq-axis component of grid-connected current and a dq-axis component of public coupling point voltage under a voltage source mode according to grid-connected three-phase current and public coupling point three-phase voltage of the inverter; then, according to the signals and the components, a dq axis component of the control signal in a voltage source mode is obtained; obtaining a control signal dq axis component in a current source mode according to the set power set value, the grid-connected current dq axis component and the common coupling point voltage dq axis component; and obtaining the total control signal dq axis component according to the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode by weighting and fusion. According to the invention, the voltage source mode and the current source mode are fused in the inverter for fusion control, so that the problems of larger area and unstable inverter of the capacitive negative damping of a single mode are avoided, and the stability is obviously improved.
Description
Technical Field
The invention relates to the field of electric power, in particular to an inverter control method and an inverter.
Background
Current inverters are typically either current source mode controlled inverters or voltage source mode controlled inverters. The inner loop of the current source mode control inverter adopts current control under a two-Phase rotation coordinate system (dq coordinate system), and further comprises PLL (Phase-locked loops) control, dq coordinate system current decoupling control and grid voltage feedforward control. The capacitive negative damping of current source mode controlled inverters is typically concentrated in the 50Hz to hundreds of Hz frequency band, which is coupled with inductive grid impedance, resulting in station resonance and instability under weak grids.
The voltage source mode control inverter comprises a power outer loop and a voltage current loop control, wherein a voltage-current double inner loop is added into the power loop for voltage closed loop control. The capacitive negative damping of the voltage source mode control inverter is concentrated in a sub-synchronous frequency band below 50Hz, and the voltage source mode control inverter is unstable under a strong current network.
In summary, the existing inverter has a large area of capacitive negative damping, which results in an unstable inverter.
Disclosure of Invention
In view of the above, the present invention provides an inverter control method and an inverter that overcome or at least partially solve the above problems.
In a first aspect, an inverter control method includes:
according to grid-connected three-phase current and the three-phase voltage of the public coupling point of the inverter, a d-axis voltage command signal, a dq-axis component of the grid-connected current and a dq-axis component of the public coupling point voltage in a voltage source mode are obtained;
obtaining a control signal dq axis component of the inverter in a voltage source mode according to the d-axis voltage command signal, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
obtaining a control signal dq axis component of the inverter in a current source mode according to the set power set value, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
And obtaining the control signal dq axis component of the inverter overall by weighting and fusing according to the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode.
Optionally, in some optional embodiments, obtaining the d-axis voltage command signal, the dq-axis component of the grid-connected current, and the dq-axis component of the common coupling point voltage in the voltage source mode according to the grid-connected three-phase current and the common coupling point three-phase voltage of the inverter includes:
according to the grid-connected three-phase current and the common coupling point three-phase voltage, average power calculation is carried out to obtain active grid-connected power and reactive grid-connected power of the inverter;
and obtaining a d-axis voltage command signal, a grid-connected current dq-axis component and a public coupling point voltage dq-axis component according to the active grid-connected power and the reactive grid-connected power.
Optionally, in some optional embodiments, performing average power calculation to obtain active grid-connected power and reactive grid-connected power of the inverter according to the grid-connected three-phase current and the common coupling point three-phase voltage, including:
converting the grid-connected three-phase current into a two-phase static coordinate system to obtain a corresponding grid-connected current alpha beta axis component;
converting the three-phase voltage of the public coupling point into a two-phase static coordinate system to obtain a corresponding alpha beta axis component of the voltage of the public coupling point;
And obtaining active grid-connected power and reactive grid-connected power according to the grid-connected current alpha beta axis component and the common coupling point voltage alpha beta axis component.
Optionally, in some optional embodiments, obtaining the d-axis voltage command signal, the grid-connected current dq-axis component, and the common coupling point voltage dq-axis component according to the active grid-connected power and the reactive grid-connected power includes:
calculating to obtain an output angular frequency and a d-axis voltage command signal of an inverter according to a pre-established voltage source mode sagging control equation, the active grid-connected power and the reactive grid-connected power, wherein the active grid-connected power and the reactive grid-connected power are used as parameters of the voltage source mode sagging control equation;
and obtaining a dq axis component of the grid-connected current and a dq axis component of the voltage of the public coupling point according to the output angular frequency.
Alternatively, in some alternative embodiments, deriving the grid-tie current dq-axis component and the point of common coupling voltage dq-axis component from the output angular frequency includes:
integrating and calculating the output angular frequency to obtain a corresponding output angle;
and obtaining a dq axis component of the grid-connected current and a dq axis component of the public coupling point voltage according to the output angle, the grid-connected three-phase current and the public coupling point three-phase voltage.
Optionally, in some optional embodiments, obtaining the dq axis component of the grid-connected current and the dq axis component of the common coupling point voltage according to the output angle, the grid-connected three-phase current, and the common coupling point three-phase voltage includes:
converting the grid-connected three-phase current into a two-phase rotating coordinate system according to the output angle to obtain a dq axis component of the grid-connected current;
and according to the output angle, converting the three-phase voltage of the public coupling point into a two-phase rotation coordinate system to obtain the dq axis component of the voltage of the public coupling point.
Optionally, in some optional embodiments, obtaining the control signal dq axis component of the inverter in the voltage source mode according to the d-axis voltage command signal, the grid-connected current dq axis component, and the common coupling point voltage dq axis component includes:
obtaining a current command signal dq axis component in a voltage source mode according to the d axis voltage command signal, the common coupling point voltage dq axis component and a set voltage source mode q axis voltage command setting signal;
and obtaining a control signal dq axis component in the voltage source mode according to the current command signal dq axis component and the grid-connected current dq axis component in the voltage source mode.
Optionally, in some optional embodiments, obtaining the dq axis component of the current command signal in the voltage source mode according to the d axis voltage command signal, the dq axis component of the common coupling point voltage, and the set q axis voltage command setting signal of the voltage source mode includes:
According to a pre-established voltage closed-loop control equation of the voltage source mode, a d-axis voltage command signal, a dq-axis component of the voltage of the public coupling point and a q-axis voltage command set signal of the voltage source mode, calculating to obtain the dq-axis component of the current command signal in the voltage source mode, wherein the d-axis voltage command signal, the dq-axis component of the voltage of the public coupling point and the q-axis voltage command set signal of the voltage source mode are taken as parameters of the voltage closed-loop control equation of the voltage source mode.
Optionally, in some optional embodiments, obtaining the dq axis component of the control signal in the voltage source mode according to the dq axis component of the current command signal in the voltage source mode and the dq axis component of the grid-connected current includes:
according to a pre-established voltage source mode current closed-loop control equation, a current command signal dq axis component and a grid-connected current dq axis component in a voltage source mode, calculating to obtain a control signal dq axis component in the voltage source mode, wherein the current command signal dq axis component and the grid-connected current dq axis component in the voltage source mode are used as parameters of the voltage source mode current closed-loop control equation.
Optionally, in some optional embodiments, obtaining the dq axis component of the control signal of the inverter in the current source mode according to the set power setting value, the dq axis component of the grid-connected current, and the dq axis component of the common coupling point voltage includes:
Obtaining a dq axis component of a current source mode current instruction signal according to a d axis component and a power set value in the dq axis component of the public coupling point voltage, wherein the power set value comprises an active power instruction set signal and a reactive power instruction set signal;
and obtaining a control signal dq axis component in the current source mode according to the dq axis component of the current instruction signal dq axis of the current source mode and the dq axis component of the grid-connected current.
Optionally, in some optional embodiments, obtaining the dq-axis component of the current source mode current command signal according to the d-axis component and the power setting value in the dq-axis component of the common coupling point voltage includes:
and calculating to obtain a dq axis component of the current command signal of the current source mode according to a pre-established current source mode power loop calculation equation, a d axis component in the dq axis component of the voltage of the public coupling point and a power set value, wherein the d axis component in the dq axis component of the voltage of the public coupling point and the power set value are used as parameters of the current source mode power loop calculation equation.
Optionally, in some optional embodiments, obtaining the dq axis component of the control signal in the current source mode according to the dq axis component of the current source mode current command signal and the dq axis component of the grid-connected current includes:
And calculating to obtain a control signal dq axis component in the current source mode according to a pre-established current closed-loop control equation of the current source mode, a dq axis component of the current command signal of the current source mode and a dq axis component of the grid-connected current, wherein the dq axis component of the current command signal of the current source mode and the dq axis component of the grid-connected current are used as parameters of the current closed-loop control equation of the current source mode.
Optionally, in some optional embodiments, the weighting and fusing to obtain the control signal dq axis component of the inverter overall according to the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode includes:
and calculating to obtain the control signal dq axis component of the inverter overall according to a pre-established weighted fusion equation, the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode.
Optionally, in some optional embodiments, after weighting and fusing the dq axis component of the control signal in the voltage source mode and the dq axis component of the control signal in the current source mode to obtain the dq axis component of the overall control signal of the inverter, the method further includes:
a switching signal of a power device of the inverter is generated based on a dq axis component of a control signal of the inverter as a whole.
Optionally, in some optional embodiments, generating a switching signal of a power device of the inverter according to a dq axis component of a control signal dq axis of the inverter overall includes:
according to the output angle, converting the dq axis component of the control signal into a three-phase stationary coordinate system to obtain a corresponding three-phase component of the control signal;
a switching signal is generated based on the three-phase component of the control signal.
Optionally, in some optional embodiments, generating the switching signal from the three-phase component of the control signal includes:
and modulating the three-phase components of the control signal based on the SVPWM algorithm to obtain a switching signal.
Optionally, in some optional embodiments, after generating the switching signal, the method further comprises:
based on the switching signal, the on-off state of the power device of the inverter is controlled through a circuit.
In a second aspect, an inverter includes: a controller;
a controller for executing the inverter control method of any one of the above.
By means of the technical scheme, the inverter control method and the inverter can obtain the d-axis voltage command signal, the dq-axis component of the grid-connected current and the dq-axis component of the public coupling point voltage in a voltage source mode according to the grid-connected three-phase current and the public coupling point three-phase voltage of the inverter; obtaining a control signal dq axis component of the inverter in a voltage source mode according to the d-axis voltage command signal, the grid-connected current dq axis component and the common coupling point voltage dq axis component; obtaining a control signal dq axis component of the inverter in a current source mode according to the set power set value, the grid-connected current dq axis component and the common coupling point voltage dq axis component; and obtaining the control signal dq axis component of the inverter overall by weighting and fusing according to the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode. Therefore, the invention can integrate the voltage source mode and the current source mode in the inverter, integrate the control signals of the two modes to obtain the overall control signal, avoid the problems of larger area of capacitive negative damping of a single mode and unstable inverter, and obviously improve the stability of the inverter.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 shows a flowchart of an inverter control method provided by the present invention;
fig. 2 shows a control structure diagram of a first inverter control method provided by the present invention;
fig. 3 shows an effect diagram of an embodiment of a second inverter control method provided by the present invention;
fig. 4 shows an effect diagram of an embodiment of a third inverter control method provided by the present invention;
fig. 5 shows an embodiment effect diagram of a fourth inverter control method provided by the present invention;
Fig. 6 shows an embodiment effect diagram of a fifth inverter control method provided by the present invention;
fig. 7 shows a block diagram of an electronic device provided by the present invention.
Detailed Description
Current inverters are typically current source mode control inverters and voltage source mode control inverters. The inner loop of the current source mode control inverter adopts current control under a two-Phase rotation coordinate system (dq coordinate system), and further comprises PLL (Phase-locked loops) control, dq coordinate system current decoupling control and grid voltage feedforward control. The capacitive negative damping of current source mode controlled inverters is typically concentrated in the 50Hz to hundreds of Hz frequency band, which is coupled with inductive grid impedance, resulting in station resonance and instability under weak grids.
The voltage source mode control inverter comprises a power outer loop and a voltage current loop control, wherein a voltage-current double inner loop is added into the power loop for voltage closed loop control. The capacitive negative damping of the voltage source mode control inverter is concentrated in a sub-synchronous frequency band below 50Hz, and the voltage source mode control inverter is unstable under a strong current network.
In summary, the existing inverter has a large area of capacitive negative damping, which results in an unstable inverter. Therefore, the inventor of the scheme can remove the phase-locked loop by weighting signals output by the voltage source mode control inverter and the current source mode control inverter, integrate the characteristics of the voltage source mode control inverter and the current source mode control inverter, greatly reduce the capacitive negative resistance area of the output impedance of the inverter and remarkably improve the stability.
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the present invention provides an inverter control method, comprising: s100, S200, S300, and S400;
s100, obtaining a d-axis voltage command signal, a grid-connected current dq-axis component and a public coupling point voltage dq-axis component in a voltage source mode according to grid-connected three-phase current and public coupling point three-phase voltage of an inverter;
optionally, the grid-connected three-phase current refers to: the inverter incorporates separate currents of three phases of electricity in the grid. For example, the grid-connected three-phase current includes i ga ，i gb And i gc 。
Alternatively, the three-phase voltage of the common coupling point in the invention refers to: the inverter incorporates voltages in the grid that are separate from the coupling points of the three-phase power of the grid. For example, the CPC three-phase voltage includes u pcca And u pccb And u pccc 。
Alternatively, the grid-connected three-phase current and the three-phase voltage of the public coupling point can be acquired through corresponding current limiting collectors and voltage collectors, which is not limited by the invention.
Alternatively, the inverter of the present invention incorporates a voltage source mode (corresponding to a voltage source mode control inverter) and a current source mode (corresponding to a current source mode control inverter). The invention can firstly carry out signal modulation based on a voltage source mode to obtain corresponding d-axis voltage command signals, a grid-connected current dq-axis component, a public coupling point voltage dq-axis component and the like.
Wherein the d-axis voltage command signal refers to: the voltage in the two-phase rotating coordinate system is used as an input variable of the control by closed-loop control d-axis reference signal.
The grid-connected current dq axis component refers to: the d-axis component and the q-axis component of the grid-connected current in the two-phase rotating coordinate system are used as feedback variables for control.
The common-coupling-point voltage dq-axis component refers to: the d-axis component and the q-axis component of the CPP voltage in the two-phase rotating coordinate system are used as feedback variables for control.
Optionally, the specific process of obtaining the d-axis voltage command signal, the dq-axis component of the grid-connected current and the dq-axis component of the public coupling point voltage in the voltage source mode according to the grid-connected three-phase current and the public coupling point three-phase voltage is not limited, and any feasible mode belongs to the protection scope of the invention.
For example, in certain alternative embodiments, S100 comprises: step 1.1 and step 1.2;
step 1.1, calculating average power according to grid-connected three-phase current and three-phase voltage of a public coupling point to obtain active grid-connected power and reactive grid-connected power of an inverter;
optionally, the active grid-connected power of the invention refers to: the active power actually emitted by the inverter during grid connection and the reactive power actually emitted by the inverter during grid connection are all used as feedback variables for control.
Alternatively, the present invention is not limited to a specific process of calculating the average power. For example, optionally, in certain alternative embodiments, step 1.1 comprises: step 1.11, step 1.12 and step 1.13;
step 1.11, converting the grid-connected three-phase current into a two-phase static coordinate system to obtain a corresponding grid-connected current alpha beta axis component;
optionally, the specific conversion process is as follows:
the grid-connected three-phase current i of the three-phase static coordinate system can be obtained through the formula ga ，i gb And i gc Converting to obtain grid-connected current alpha beta axis component i of two-phase static coordinate system gα And i gβ . Wherein i is gα Alpha-axis component, i of alpha-beta-axis components of grid-connected current of two-phase static coordinate system gβ Is the beta axis component in the alpha beta axis component of the grid-connected current of the two-phase static coordinate system.
Step 1.12, converting the three-phase voltage of the public coupling point into a two-phase static coordinate system to obtain a corresponding alpha beta axis component of the voltage of the public coupling point;
optionally, the specific conversion process is as follows:
the three-phase voltage u of the common coupling point of the three-phase static coordinate system can be obtained by the formula pcca And u pccb And u pccc Conversion to obtain the alpha beta axis component u of the CPC voltage of the two-phase stationary coordinate system pccα And u pccβ . Wherein u is pccα An alpha-axis component, u, of alpha-beta-axis components of the CPC voltage of a two-phase stationary coordinate system pccβ Is the beta axis component of the alpha beta axis component of the CPC voltage of the two-phase stationary coordinate system.
And step 1.13, obtaining active grid-connected power and reactive grid-connected power according to the grid-connected current alpha beta axis component and the common coupling point voltage alpha beta axis component.
Alternatively, the present invention may calculate the active grid-connected power P based on the grid-connected current αβ axis component, the common coupling point voltage αβ axis component, and the average power calculation equation shown below e And reactive grid-connected power Q e 。
Alternatively, wherein T filter1 The low pass filter time constant is calculated for the average power and s is the laplace operator.
And 1.2, obtaining a d-axis voltage command signal, a grid-connected current dq-axis component and a public coupling point voltage dq-axis component according to the active grid-connected power and the reactive grid-connected power.
For example, in certain alternative embodiments, step 1.2 comprises: step 1.21 and step 1.22;
step 1.21, calculating to obtain an output angular frequency and a d-axis voltage command signal of an inverter according to a pre-established voltage source mode sagging control equation, the active grid-connected power and the reactive grid-connected power, wherein the active grid-connected power and the reactive grid-connected power are used as parameters of the voltage source mode sagging control equation;
alternatively, the voltage source mode droop control equation according to the present invention is as follows:
in the middle of，ω n For the nominal angular frequency of the system, V nAmp For the rated line voltage amplitude, m is the active droop coefficient and n is the reactive droop coefficient. Through the formula, the invention can calculate and obtain the output angular frequency omega and d-axis voltage command signal u of the inverter dref 。
And step 1.22, obtaining a dq axis component of the grid-connected current and a dq axis component of the voltage of the public coupling point according to the output angular frequency.
For example, in certain alternative embodiments, step 1.22 comprises: step 1.221 and step 1.222;
Step 1.221, performing integral calculation on the output angular frequency to obtain a corresponding output angle;
alternatively, the process of integration calculation is as follows:
where s is the Laplacian. Through the formula, the output angle theta can be obtained.
And step 1.222, obtaining a dq axis component of the grid-connected current and a dq axis component of the public coupling point voltage according to the output angle, the grid-connected three-phase current and the public coupling point three-phase voltage.
Optionally, in certain optional embodiments, step 1.222 comprises: step 1.2221 and step 1.2222;
1.2221, converting the grid-connected three-phase current into a two-phase rotating coordinate system according to the output angle to obtain a dq axis component of the grid-connected current;
optionally, the specific conversion process is as follows:
optionally, through the conversion formula, the invention can combine the three-phase stationary coordinate system with the grid-connected three-phase current i ga ，i gb And i gc Grid-connected current dq axis of two-phase rotation coordinate system obtained by conversionComponent i gd And i gq . Wherein i is gd Is the d-axis component, i of the dq-axis component of the grid-connected current of the two-phase rotating coordinate system gq Is the q-axis component of the dq-axis component of the grid-connected current of the two-phase rotating coordinate system.
And 1.2222, converting the three-phase voltage of the public coupling point into a two-phase rotating coordinate system according to the output angle to obtain the dq axis component of the voltage of the public coupling point.
Optionally, the specific conversion process is as follows:
alternatively, the invention can convert the three-phase voltage u of the common coupling point of the three-phase static coordinate system by the conversion formula pcca And u pccb And u pccc Conversion to obtain the dq axis component u of the CPC voltage of the two-phase rotating coordinate system pccd And u pccq . Wherein u is pccd Is the d-axis component, u of the dq-axis component of the CPC voltage of the two-phase rotating coordinate system pccq Is the q-axis component of the dq-axis component of the CPC voltage of the two-phase rotating coordinate system.
S200, obtaining a control signal dq axis component of the inverter in a voltage source mode according to the d-axis voltage command signal, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
for example, in certain alternative embodiments, S200 comprises: step 2.1 and step 2.2;
step 2.1, obtaining a current command signal dq axis component in a voltage source mode according to a d-axis voltage command signal, a public coupling point voltage dq axis component and a set voltage source mode q-axis voltage command setting signal;
optionally, the q-axis voltage command setting signal of the voltage source mode is a set value, and may be specifically set according to actual needs, which is not limited in the present invention.
Optionally, in certain optional embodiments, step 2.1 includes: step 2.11;
And 2.11, calculating to obtain a current command signal dq axis component in the voltage source mode according to a pre-established voltage closed-loop control equation of the voltage source mode, a d-axis voltage command signal, a public coupling point voltage dq axis component and a voltage source mode q-axis voltage command set signal, wherein the d-axis voltage command signal, the public coupling point voltage dq axis component and the voltage source mode q-axis voltage command set signal are all used as parameters of the voltage source mode voltage closed-loop control equation.
Optionally, the voltage source mode voltage closed loop control equation is shown as follows:
i dref1 ＝(K vvp +K vvi /s)(u dref -u pccd )
i qref1 ＝(K vvp +K vvi /s)(u qref -u pccq )
wherein K is vvp And K vvi The proportional and integral coefficients of the voltage source mode voltage closed loop control PI regulator, respectively. Through the formula, the invention can calculate and obtain the dq axis component i of the current command signal in the voltage source mode dref1 And i qref1 . Wherein i is dref1 Is the d-axis component, i of the dq-axis component of the current command signal in the voltage source mode qref1 Is the q-axis component of the dq-axis component of the current command signal in the voltage source mode.
And 2.2, obtaining a control signal dq axis component in the voltage source mode according to the current command signal dq axis component and the grid-connected current dq axis component in the voltage source mode.
For example, in certain alternative embodiments, step 2.2 comprises: step 2.21;
And 2.21, calculating to obtain a control signal dq axis component in the voltage source mode according to a pre-established voltage source mode current closed-loop control equation, a current command signal dq axis component in the voltage source mode and a grid-connected current dq axis component, wherein the current command signal dq axis component in the voltage source mode and the grid-connected current dq axis component are used as parameters of the voltage source mode current closed-loop control equation.
Optionally, the voltage source mode current closed loop control equation is shown as follows:
u d1 ＝(K vcp +K vci /s)(i dref1 -i gd )
u q1 ＝(K vcp +K vci /s)(i qref1 -i gq )
wherein K is vcp And K vci The proportional and integral coefficients of the voltage source mode current closed loop control PI regulator, respectively. Through the formula, the invention can calculate the dq axis component u of the control signal in the voltage source mode d1 And u q1 . Wherein u is d1 Is the d-axis component, u of the dq-axis component of the control signal in the voltage source mode q1 Is the q-axis component of the dq-axis component of the control signal in the voltage source mode.
S300, obtaining a control signal dq axis component of the inverter in a current source mode according to the set power set value, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
for example, in certain alternative embodiments, S300 comprises: step 3.1 and step 3.2;
Step 3.1, obtaining a dq axis component of a current source mode current instruction signal according to a d axis component in the dq axis component of the public coupling point voltage and a power set value, wherein the power set value comprises an active power instruction set signal and a reactive power instruction set signal;
alternatively, the power setting value is a setting value, and the present invention can be set according to actual needs, which is not limited by the present invention.
Optionally, in certain optional embodiments, step 3.1 includes: step 3.11;
and 3.11, calculating to obtain a dq axis component of the current source mode current command signal according to a pre-established current source mode power loop calculation equation, a d axis component in the dq axis component of the common coupling point voltage and a power set value, wherein the d axis component and the power set value in the dq axis component of the common coupling point voltage are used as parameters of the current source mode power loop calculation equation.
Optionally, the current source mode power loop calculation equation is shown as follows:
wherein T is filter2 Time constant of low-pass filter of power loop in current source mode, s is Laplacian, u pccd For d-axis component, P, of the dq-axis components of the CPC voltage ref Setting signal for active power instruction, Q ref Reactive power command set signal. Through the formula, the invention can calculate and obtain the dq axis component i of the current command signal of the current source mode dref2 And i qref2 . Wherein i is dref2 I is the d-axis component, i, of the dq-axis components of the current source mode current command signal qref2 The q-axis component of the dq-axis component is the current source mode current command signal.
And 3.2, obtaining a control signal dq axis component in the current source mode according to the dq axis component of the current instruction signal dq axis of the current source mode and the dq axis component of the grid-connected current.
For example, in certain alternative embodiments, step 3.2 comprises: step 3.21;
and 3.21, calculating to obtain a control signal dq axis component in the current source mode according to a pre-established current closed-loop control equation of the current source mode, a dq axis component of the current command signal of the current source mode and a dq axis component of the grid-connected current, wherein the dq axis component of the current command signal of the current source mode and the dq axis component of the grid-connected current are used as parameters of the current closed-loop control equation of the current source mode.
Optionally, the current source mode current closed loop control equation is as follows:
u d2 ＝(K ccp +K cci /s)(i dref2 -i gd )
u q2 ＝(K ccp +K cci /s)(i qref2 -i gq )
wherein K is ccp And K cci The proportional and integral coefficients of the current source mode current closed loop control PI regulator, respectively. Through the formula, the invention can calculate the dq axis component u of the control signal in the current source mode d2 And u q2 . Wherein u is d2 For d-axis component, u, of dq-axis components of control signal in current source mode q2 Is the q-axis component of the control signal dq in the current source mode.
S400, obtaining the dq axis component of the overall control signal of the inverter by means of weighted fusion according to the dq axis component of the control signal in the voltage source mode and the dq axis component of the control signal in the current source mode.
For example, in certain alternative embodiments, S400 comprises: step 4.1;
and 4.1, calculating to obtain the control signal dq axis component of the inverter overall according to a pre-established weighted fusion equation, the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode.
Optionally, the weighted fusion equation is as follows:
u d ＝Nu d1 +(1-N)u d2
u q ＝Nu q1 +(1-N)u q2
wherein N is a fusion control weighting coefficient. Through the formula, the invention can calculate the dq axis component u of the control signal of the inverter overall d And u q . Wherein u is d D-axis component, u, of the dq-axis components of the control signal for the inverter overall q The q-axis component of the control signal dq-axis component for the inverter as a whole.
Optionally, in some optional embodiments, after S400, the method further comprises: step 5.1;
And 5.1, generating a switching signal of a power device of the inverter according to the dq axis component of the overall control signal of the inverter.
For example, in certain alternative embodiments, step 5.1 comprises: step 5.11 and step 5.12;
step 5.11, converting the dq axis component of the control signal into a three-phase stationary coordinate system according to the output angle to obtain a corresponding three-phase component of the control signal;
optionally, the conversion process is as follows:
through the formula, the invention can convert the dq axis component of the control signal of the two-phase rotating coordinate system to obtain the three-phase components of the control signal under the three-phase stationary coordinate system, which are u respectively a 、u b And u c 。
And 5.12, generating a switching signal according to the three-phase component of the control signal.
For example, in certain alternative embodiments, step 5.12 comprises: step 5.121;
and 5.121, modulating the three-phase components of the control signal based on the SVPWM algorithm to obtain a switching signal.
Alternatively, the SVPWM algorithm refers to: space vector pulse width modulation, english name: space Vector Pulse Width Modulation.
Optionally, in some optional embodiments, after generating the switching signal, the method further comprises: step 6.1;
And 6.1, controlling the on-off state of a power device of the inverter through a circuit based on the switching signal.
Optionally, taking the inverter as a three-phase full-bridge inverter integrating a current source mode and a voltage source mode as an example, the invention can control the on and off of a power device of the three-phase full-bridge inverter through a driving protection circuit.
Optionally, for further clarity of description of the solution of the present invention, please refer to the control structure diagram shown in fig. 2, for understanding the above embodiments, which is not described in detail herein.
Based on the data, the invention provides the following group of embodiment data to explain that the phase-locked loop can be removed by weighting the signals output by the voltage source mode control inverter and the current source mode control inverter, the characteristics of the voltage source mode control inverter and the current source mode control inverter are fused, the capacitive negative resistance area of the output impedance of the inverter is greatly reduced, and the stability is remarkably improved.
Example data:
active power command setting signal P ref ：20kW；
Reactive power instruction setting signal Q ref ：0kW；
Average power calculation low pass filter time constant T filter1 ：1/(60π)；
System nominal angular frequency omega n ：100π；
Rated line voltage amplitude V nAmp ：
Active droop coefficient m:0.0001413;
reactive droop coefficient n:0.0010885;
proportional coefficient K of voltage source mode voltage closed-loop control PI regulator vvp ：0.05；
Integral coefficient K of voltage source mode voltage closed-loop control PI regulator vvi ：120；
Proportional coefficient K of voltage source mode current closed loop control PI regulator vcp ：4；
Integration coefficient K of voltage source mode current closed loop control PI regulator vci ；10；
Current source mode power loop low pass filter time constant T filter2 ：1/(10π)；
Proportional coefficient K of current source mode current closed loop control PI regulator ccp ：1；
Integration coefficient K of current source mode current closed loop control PI regulator cci ：270；
Fusion control weighting coefficient N: the selection principle is that the range of SCR (Short Circuit Ratio, short-circuit capacity ratio) in which the inverter can stably operate is the largest, and 0.5 is taken in this embodiment.
In the case of different SCRs, the experimentally obtained current-voltage waveforms are different. For example, an a-phase voltage current waveform of the inverter only when scr=2 in the current source mode is shown as fig. 3; fig. 4 shows a-phase voltage current waveforms of the inverter only in voltage source mode, scr=9; fig. 5 is a graph showing the a-phase voltage current waveform of the inverter when scr=1.5 using the control scheme of the present invention; fig. 6 shows the a-phase voltage current waveform of the inverter at scr=15 for the control scheme of the present invention.
The present invention provides an inverter including: a controller;
a controller for executing the inverter control method of any one of the above.
Therefore, the invention can integrate the voltage source mode and the current source mode in the inverter, integrate the control signals of the two modes to obtain the overall control signal, avoid the problems of larger area of capacitive negative damping of a single mode and unstable inverter, and obviously improve the stability of the inverter. The stable running SCR range basically reaches the range of SCR=1 to SCR=150, and the grid-connected dynamic steady state performance requirement under the condition of large fluctuation of SCR is met.
The present invention provides a computer-readable storage medium having stored thereon a program which, when executed by a processor, implements the inverter control method of any one of the above.
As shown in fig. 7, the present invention provides an electronic device 70, the electronic device 70 comprising at least one processor 701, and at least one memory 702, bus 703 connected to the processor 701; wherein, the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to invoke program instructions in the memory 702 to perform the inverter control method of any of the above.
In the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (18)
1. An inverter control method, comprising:
according to grid-connected three-phase current and the three-phase voltage of the public coupling point of the inverter, a d-axis voltage command signal, a dq-axis component of the grid-connected current and a dq-axis component of the public coupling point voltage in a voltage source mode are obtained;
obtaining a control signal dq axis component of the inverter in the voltage source mode according to the d-axis voltage command signal, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
Obtaining a control signal dq axis component of the inverter in a current source mode according to the set power setting value, the grid-connected current dq axis component and the common coupling point voltage dq axis component;
and obtaining the control signal dq axis component of the inverter overall by means of weighted fusion according to the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode.
2. The method according to claim 1, wherein the obtaining the d-axis voltage command signal, the dq-axis component of the grid-connected current, and the dq-axis component of the common coupling point voltage in the voltage source mode according to the grid-connected three-phase current and the common coupling point three-phase voltage of the inverter includes:
according to the grid-connected three-phase current and the public coupling point three-phase voltage, average power calculation is carried out to obtain active grid-connected power and reactive grid-connected power of the inverter;
and obtaining the d-axis voltage command signal, the grid-connected current dq-axis component and the public coupling point voltage dq-axis component according to the active grid-connected power and the reactive grid-connected power.
3. The method according to claim 2, wherein the calculating average power according to the grid-connected three-phase current and the common coupling point three-phase voltage to obtain the active grid-connected power and the reactive grid-connected power of the inverter comprises:
Converting the grid-connected three-phase current into a two-phase static coordinate system to obtain a corresponding grid-connected current alpha beta axis component;
the three-phase voltage of the public coupling point is converted into the two-phase static coordinate system, so that a corresponding alpha beta axis component of the voltage of the public coupling point is obtained;
and obtaining the active grid-connected power and the reactive grid-connected power according to the grid-connected current alpha beta axis component and the common coupling point voltage alpha beta axis component.
4. A method according to claim 3, wherein said deriving said d-axis voltage command signal, said grid-tie current dq-axis component and said point of common coupling voltage dq-axis component from said active grid-tie power and said reactive grid-tie power comprises:
calculating to obtain the output angular frequency of the inverter and the d-axis voltage command signal according to a pre-established voltage source mode sagging control equation, the active grid-connected power and the reactive grid-connected power, wherein the active grid-connected power and the reactive grid-connected power are used as parameters of the voltage source mode sagging control equation;
and obtaining the dq axis component of the grid-connected current and the dq axis component of the voltage of the public coupling point according to the output angular frequency.
5. The method of claim 4, wherein said deriving said grid-tie current dq-axis component and said point of common coupling voltage dq-axis component from said output angular frequency comprises:
integrating the output angular frequency to obtain a corresponding output angle;
and obtaining the dq axis component of the grid-connected current and the dq axis component of the public coupling point voltage according to the output angle, the grid-connected three-phase current and the public coupling point three-phase voltage.
6. The method of claim 5, wherein deriving the grid-tie current dq-axis component and the common-tie voltage dq-axis component from the output angle, the grid-tie three-phase current, and the common-tie three-phase voltage comprises:
converting the grid-connected three-phase current into a two-phase rotating coordinate system according to the output angle to obtain a dq axis component of the grid-connected current;
and according to the output angle, converting the three-phase voltage of the public coupling point into the two-phase rotation coordinate system to obtain the dq axis component of the voltage of the public coupling point.
7. The method according to any one of claims 1-6, wherein said deriving a control signal dq-axis component of the inverter in the voltage source mode from the d-axis voltage command signal, the grid-tie current dq-axis component and the point of common coupling voltage dq-axis component comprises:
Obtaining a current command signal dq axis component in the voltage source mode according to the d axis voltage command signal, the common coupling point voltage dq axis component and a set voltage source mode q axis voltage command setting signal;
and obtaining a control signal dq axis component in the voltage source mode according to the current command signal dq axis component in the voltage source mode and the grid-connected current dq axis component.
8. The method of claim 7, wherein the deriving the current command signal dq-axis component in the voltage source mode from the d-axis voltage command signal, the point of common coupling voltage dq-axis component, and a set voltage source mode q-axis voltage command setting signal comprises:
according to a pre-established voltage source mode voltage closed-loop control equation, the d-axis voltage command signal, the public coupling point voltage dq axis component and the voltage source mode q-axis voltage command setting signal, calculating to obtain a current command signal dq axis component in the voltage source mode, wherein the d-axis voltage command signal, the public coupling point voltage dq axis component and the voltage source mode q-axis voltage command setting signal are all used as parameters of the voltage source mode voltage closed-loop control equation.
9. The method of claim 7, wherein the deriving the control signal dq-axis component in the voltage source mode from the current command signal dq-axis component in the voltage source mode and the grid-tie current dq-axis component comprises:
and calculating to obtain a control signal dq axis component in the voltage source mode according to a pre-established voltage source mode current closed-loop control equation, a current command signal dq axis component in the voltage source mode and the grid-connected current dq axis component, wherein the current command signal dq axis component in the voltage source mode and the grid-connected current dq axis component are used as parameters of the voltage source mode current closed-loop control equation.
10. The method according to any of claims 1-6, wherein deriving the control signal dq-axis component of the inverter in current source mode from the set power setting, the grid-tie current dq-axis component and the common-tie point voltage dq-axis component comprises:
obtaining a dq axis component of a current source mode current instruction signal according to a d axis component in the dq axis component of the public coupling point voltage and the power set value, wherein the power set value comprises an active power instruction set signal and a reactive power instruction set signal;
And obtaining a control signal dq axis component in the current source mode according to the current command signal dq axis component of the current source mode and the grid-connected current dq axis component.
11. The method of claim 10, wherein said deriving a current source mode current command signal dq axis component from a d-axis component of said point of common coupling voltage dq axis component and said power setpoint comprises:
and calculating the current command signal dq axis component of the current source mode according to a pre-established current source mode power loop calculation equation, the d axis component in the dq axis component of the voltage dq of the common coupling point and the power set value, wherein the d axis component in the dq axis component of the voltage dq of the common coupling point and the power set value are used as parameters of the current source mode power loop calculation equation.
12. The method of claim 10, wherein deriving the control signal dq-axis component in the current source mode from the current command signal dq-axis component and the grid-tie current dq-axis component comprises:
and calculating to obtain a control signal dq axis component in the current source mode according to a pre-established current closed-loop control equation of the current source mode, the dq axis component of the current source mode current command signal and the dq axis component of the grid-connected current, wherein the dq axis component of the current source mode current command signal and the dq axis component of the grid-connected current are used as parameters of the current closed-loop control equation of the current source mode current.
13. The method according to any one of claims 1-6, wherein said weighting and fusing the control signal dq-axis component in the voltage source mode and the control signal dq-axis component in the current source mode to obtain the control signal dq-axis component of the inverter overall comprises:
and calculating to obtain the control signal dq axis component of the inverter overall according to a pre-established weighted fusion equation, the control signal dq axis component in the voltage source mode and the control signal dq axis component in the current source mode.
14. The method of claim 13, wherein after the weighting-fusing the control signal dq-axis component of the inverter population from the control signal dq-axis component in the voltage source mode and the control signal dq-axis component in the current source mode, the method further comprises:
and generating a switching signal of a power device of the inverter according to the dq axis component of the control signal of the inverter overall.
15. The method of claim 14, wherein generating a switching signal for a power device of the inverter from the dq-axis component of the control signal for the inverter overall comprises:
According to the output angle, converting the dq axis component of the control signal into a three-phase stationary coordinate system to obtain a corresponding three-phase component of the control signal;
and generating the switching signal according to the three-phase component of the control signal.
16. The method of claim 15, wherein generating the switching signal from the control signal three-phase component comprises:
and modulating the three-phase components of the control signal based on an SVPWM algorithm to obtain the switching signal.
17. The method of claim 16, wherein after generating the switching signal, the method further comprises:
and controlling the on-off state of a power device of the inverter through a circuit based on the switching signal.
18. An inverter, comprising: a controller;
the controller for performing the inverter control method of any one of claims 1 to 17.
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