CN113904373B - Stability enhancement control method for grid-connected converter under different output working conditions - Google Patents
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Classifications
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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
- H02J3/381—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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
-
- 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
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/28—The renewable source being wind energy
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a stability enhancement control method of a grid-connected converter under different output working conditions, which comprises the following steps: s1, carrying out coordinate transformation on three-phase power grid voltage to obtain q-axis voltage V under a synchronous rotation coordinate system q The method comprises the steps of carrying out a first treatment on the surface of the S2, for the voltage V q Performing phase-locked loop proportional integral processing to obtain a variable delta q1 The method comprises the steps of carrying out a first treatment on the surface of the S3, for the variable delta q1 With the power frequency angular frequency omega 1 The sum of the phase-locked loop phase and the phase-locked loop phase is integrated to obtain the phase-locked loop phase theta; s4, for the variable delta q1 Integrating to obtain an integrated result value, and performing high-pass filtering processing on the result value to obtain a phase harmonic component theta har The method comprises the steps of carrying out a first treatment on the surface of the S5, phase theta and phase harmonic component theta of the phase ring har The difference between them is taken as corrected phase theta 1 And the phase theta 1 As phase parameters for the control of the current transformer. The invention can ensure the stability of the converter under different output working conditions and has faster response speed.
Description
Technical Field
The invention relates to the field of converters, in particular to a stability enhancement control method of a grid-connected converter under different output working conditions.
Background
New energy sources such as wind power and photovoltaic are used in the global scope due to the characteristics of cleanliness, reproducibility and the like. However, the change of wind speed or illumination intensity can cause the change of new energy output, and further can cause harmonic voltage and current to appear in a grid-connected point of the converter grid-connected system, so that the stability of the new energy grid-connected system is affected, part of new energy units are offline, the safe and stable operation of a power grid is endangered, and a large number of accidents such as equipment damage, regional power failure and the like are caused.
In view of the above stability problems, there have been many studies to propose different stability control strategies. Active or passive damping control, feed forward control and adaptive control based on-line monitoring. These control modes can enhance the stability of the current transformer to a certain extent, but have certain limitations. For example, feedforward control and adaptive control, more than two proportional integral controls are added on the original controller structure, and meanwhile, external variables are monitored by using additional sensors, and corresponding controller parameters are calculated in real time according to the change of the variables, so that the control complexity and calculation amount are obviously increased, and the dynamic response is reduced. Especially when external working conditions change, such as output change, the strategy cannot guarantee stable operation of the system in the whole working condition range.
Disclosure of Invention
Therefore, the invention aims to overcome the defects in the prior art, and provides the stability enhancement control method for the grid-connected converter under different output working conditions, so that the stability of the converter under different output working conditions can be ensured, and the response speed is higher.
The invention discloses a stability enhancement control method of a grid-connected converter under different output working conditions, which comprises the following steps:
s1, carrying out coordinate transformation on three-phase power grid voltage to obtain q-axis voltage V under a synchronous rotation coordinate system q ；
S2, for the voltage V q Performing phase-locked loop proportional integral processing to obtain a variable delta q1 ；
S3, for the variable delta q1 With the power frequency angular frequency omega 1 The sum of the phase-locked loop phase and the phase-locked loop phase is integrated to obtain the phase-locked loop phase theta;
s4, for the variable delta q1 Integrating to obtain an integrated result value, and performing high-pass filtering on the result valueProcessing to obtain phase harmonic component theta har ；
S5, phase theta and phase harmonic component theta of the phase ring har Difference between theta and theta har As corrected phase theta 1 And the phase theta 1 As phase parameters for the control of the current transformer.
Further, in step S2, a phase-locked loop proportional-integral controller H is used PLL (s) for the voltage V q Performing phase-locked loop proportional integral processing;
the phase-locked loop proportional-integral controller
Wherein k is p,pll Is a proportionality coefficient, k i,plll And s is a complex variable and is an integral coefficient.
Further, the phase-locked loop proportional-integral controller H PLL The control parameter of (2) includes f band0 F band1 The method comprises the steps of carrying out a first treatment on the surface of the Said f band0 The initial phase-locked loop bandwidth parameter; f (f) band1 Is an improved phase-locked loop bandwidth parameter and satisfies f band0 <f band1 。
Further, in step S4, a high pass filter H is used hpf Performing high-pass filtering processing on the result value;
the high pass filter
Wherein omega f Is the cut-off frequency of the high pass filter; s is a complex variable.
Further, the high-pass filter H hpf The control parameter of (2) includes f cut0 F cut1 The method comprises the steps of carrying out a first treatment on the surface of the Said f cut0 Is an initial cut-off frequency; f (f) cut1 Is an improved cut-off frequency and satisfies f cut0 >f cut1 。
Further, under different output conditions:
when the output power of the converter is larger than the set value, adjusting the proportional-integral control of the phase-locked loopDevice H PLL Is f as a parameter band1 And adjusts the high-pass filter H hpf Is f as a parameter cut1 ；
When the output power of the converter is smaller than the set value, the phase-locked loop proportional-integral controller H is adjusted PLL Is f as a parameter band0 And adjusts the high-pass filter H hpf Is f as a parameter cut0 。
Further, in step S3, according to the integral typeFor the variable delta q1 With the power frequency angular frequency omega 1 And integrating.
Further, in step S4, according to the integral typeFor the variable delta q1 Integration is performed.
Further, the phase θ 1 The phase parameters of the converter control specifically include:
the phase theta is set to 1 The phase θ is input as a phase in the voltage Park conversion equation 1 As a phase input in the current Park conversion equation and converting the phase θ 1 As the phase input in the duty cycle Park conversion equation.
The beneficial effects of the invention are as follows: according to the stability enhancement control method for the grid-connected converter under different output working conditions, firstly, harmonic components of phase-locked loop output phases of the grid-connected converter under different output working conditions are extracted, then the extracted harmonic components are subtracted from the original phase-locked loop output phases, further, correction of the output phases is achieved, correction of the output phases under different output working conditions is achieved, and finally, the converter is enabled to stably operate under different output working conditions, and stability of the converter is enhanced. The invention can effectively ensure the stable operation of the output of the converter in the whole working condition range, and avoid the problem of poor working condition adaptability of the existing control strategy. Meanwhile, the bandwidth of the phase-locked loop is not reduced by the proposed control strategy, and complex control mechanisms and real-time measurement calculation are avoided, so that the dynamic response is faster.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of the control principle of the present invention;
FIG. 2 is a control parameter adjustment chart of the present invention;
FIG. 3 is a graph of the dynamic response of q-axis voltage under grid phase fluctuations of the present invention;
FIG. 4 is a waveform diagram of voltage and current at grid-tie points at different output powers according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings, in which:
the invention discloses a stability enhancement control method of a grid-connected converter under different output working conditions, which comprises the following steps:
s1, carrying out coordinate transformation on three-phase power grid voltage to obtain q-axis voltage V under a synchronous rotation coordinate system q The method comprises the steps of carrying out a first treatment on the surface of the Wherein, as shown in fig. 1, the three-phase network voltage v a ，v b V c After Park coordinate transformation, q-axis voltage V under dq coordinate system is obtained q ；
S2, for the voltage V q Performing phase-locked loop proportional integral processing to obtain a variable delta q1 ；
S3, for the variable delta q1 With the power frequency angular frequency omega 1 The sum of the phase-locked loop phase and the phase-locked loop phase is integrated to obtain the phase-locked loop phase theta; wherein, the power frequency angular frequency omega 1 Adopts the prior art, and domestic power frequency angular frequency meets omega 1 ＝50*2π；
S4, for the variable delta q1 Integrating to obtain an integrated result value, and performing high-pass filtering processing on the result value to obtain a phase harmonic component theta har ；
S5, phase theta and phase harmonic component theta of the phase ring har Difference between theta and theta har As corrected phase theta 1 And the phase theta 1 As phase parameters for the control of the current transformer.
In the embodiment, in step S2, a phase-locked loop proportional-integral controller H is used PLL (s) for the voltage V q Performing phase-locked loop proportional integral processing;
the phase-locked loop proportional-integral controller H PLL (s) a PI controller is adopted, and the proportional control and integral control functions are realized; the phase-locked loop proportional-integral controller
Wherein k is p,pll Is a proportionality coefficient, k i,plll And s is a complex variable and is an integral coefficient. So k is p,pll 、k i,plll And s can be designed to take on value by existing loops.
In this embodiment, the phase-locked loop proportional-integral controller H PLL The control parameter of (2) includes f band0 F band1 The method comprises the steps of carrying out a first treatment on the surface of the Said f band0 The initial phase-locked loop bandwidth parameter; f (f) band1 Is an improved phase-locked loop bandwidth parameter and satisfies f band0 <f band1 . Wherein the improved phase-locked loop bandwidth parameter f band1 The range of values is generally: 1.5f band0 ～2f band0 。
In this embodiment, in step S4, a high-pass filter H is used hpf Performing high-pass filtering processing on the result value; the high-pass filter H hpf The filter is used for filtering low-frequency signals and only allowing high-frequency signals to pass through; obtaining a phase harmonic component by filtering a low-frequency component or a direct-current component of the integrated result value;
the high pass filter
Wherein omega f Is the cut-off frequency of the high pass filter; s is a complex variable.
In this embodiment, the high-pass filter H hpf The control parameter of (2) includes f cut0 F cut1 The method comprises the steps of carrying out a first treatment on the surface of the Said f cut0 Is an initial cut-off frequency; f (f) cut1 For improved cut-off frequencyRate and satisfy f cut0 >f cut1 . Wherein the improved cut-off frequency f cut1 The control bandwidth of the current transformer is often less than 1000Hz and f is determined according to the control bandwidth of the current transformer cut1 Satisfy 1000Hz or more, so f cut1 The value of (2) may be 1000Hz.
In this embodiment, as shown in fig. 2, under different output conditions:
when the output power of the converter is larger than a set value, the phase-locked loop proportional-integral controller H is adjusted PLL Is f as a parameter band1 And adjusts the high-pass filter H hpf Is f as a parameter cut1 ；
When the output power of the converter is smaller than the set value, the phase-locked loop proportional-integral controller H is adjusted PLL Is f as a parameter band0 And adjusts the high-pass filter H hpf Is f as a parameter cut0 。
In the present embodiment, in step S3, the integral type is usedFor the variable delta q1 With the power frequency angular frequency omega 1 And integrating. Wherein integration is performed using an existing integrator.
In the present embodiment, in step S4, the integral type is usedFor the variable delta q1 Integration is performed. Wherein integration is performed using an existing integrator.
In the present embodiment, the phase θ 1 The phase parameters of the converter control specifically include:
the phase theta is set to 1 The phase θ is input as a phase in the voltage Park conversion equation 1 As a phase input in the current Park conversion equation and converting the phase θ 1 As the phase input in the duty cycle Park conversion equation. Wherein the phase θ 1 The phase input in the voltage Park conversion equation refers to Park coordinates of a target voltageDuring transformation, the phase theta is adjusted 1 As a phase input parameter; the phase theta is set to 1 The phase input in the current Park conversion equation means that the phase theta is obtained when Park coordinate conversion is performed on the target current 1 As a phase input parameter; the phase theta is set to 1 The phase input in the duty ratio Park conversion equation means that the phase theta is converted by Park coordinate conversion on the target duty ratio 1 As phase input parameters.
According to the control method, a simulation experiment is carried out, and the obtained simulation result is as follows:
as shown in fig. 3, the voltage V after phase change from the grid voltage q1 As can be seen from the waveform of (a), the response time is 2.5ms, which is half the response time of the existing adaptive control strategy. In addition, fig. 4 shows waveforms of voltage and current under the change of power of the converter when the system operates in a weak grid environment, the rated power of the converter is 10kW, and it can be observed from fig. 4 that the system can stably operate in the whole output power range.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (4)
1. A stability enhancement control method of a grid-connected converter under different output working conditions is characterized by comprising the following steps of: the method comprises the following steps:
s1, carrying out coordinate transformation on three-phase power grid voltage to obtain q-axis voltage V under a synchronous rotation coordinate system q ；
S2, for the voltage V q Performing phase-locked loop proportional integral processing to obtain a variable delta q1 ；
In step S2, a phase-locked loop proportional-integral controller H is adopted PLL (s) for the voltage V q Performing phase-locked loop proportional integral processing;
the phase-locked loop proportional-integral controller
Wherein k is p,pll Is a proportionality coefficient, k i,plll S is a complex variable and is an integral coefficient;
the phase-locked loop proportional-integral controller H PLL The control parameter of (2) includes f band0 F band1 The method comprises the steps of carrying out a first treatment on the surface of the Said f band0 The initial phase-locked loop bandwidth parameter; f (f) band1 Is an improved phase-locked loop bandwidth parameter and satisfies f band0 <f band1 ；
S3, for the variable delta q1 With the power frequency angular frequency omega 1 The sum of the phase-locked loop phase and the phase-locked loop phase is integrated to obtain the phase-locked loop phase theta;
s4, for the variable delta q1 Integrating to obtain an integrated result value, and performing high-pass filtering processing on the result value to obtain a phase harmonic component theta har ；
In step S4, a high pass filter H is used hpf Performing high-pass filtering processing on the result value;
the high pass filter
Wherein omega f Is the cut-off frequency of the high pass filter; s is a complex variable;
the high-pass filter H hpf The control parameter of (2) includes f cut0 F cut1 The method comprises the steps of carrying out a first treatment on the surface of the Said f cut0 Is an initial cut-off frequency; f (f) cut1 Is an improved cut-off frequency and satisfies f cut0 >f cut1 ；
S5, phase theta and phase harmonic component theta of the phase ring har Difference between theta and theta har As corrected phase theta 1 And the phase theta 1 As a phase parameter for the converter control;
under different output working conditions:
when the current is changedWhen the output power of the device is larger than the set value, the phase-locked loop proportional-integral controller H is adjusted PLL Is f as a parameter band1 And adjusts the high-pass filter H hpf Is f as a parameter cut1 ；
When the output power of the converter is smaller than the set value, the phase-locked loop proportional-integral controller H is adjusted PLL Is f as a parameter band0 And adjusts the high-pass filter H hpf Is f as a parameter cut0 。
2. The method for enhancing and controlling the stability of the grid-connected converter under different output working conditions according to claim 1, wherein the method is characterized by comprising the following steps of: in step S3, according to the integral typeFor the variable delta q1 With the power frequency angular frequency omega 1 And integrating.
3. The method for enhancing and controlling the stability of the grid-connected converter under different output working conditions according to claim 1, wherein the method is characterized by comprising the following steps of: in step S4, according to the integral typeFor the variable delta q1 Integration is performed.
4. The method for enhancing and controlling the stability of the grid-connected converter under different output working conditions according to claim 1, wherein the method is characterized by comprising the following steps of: the phase theta is set to 1 The phase parameters of the converter control specifically include:
the phase theta is set to 1 The phase θ is input as a phase in the voltage Park conversion equation 1 As a phase input in the current Park conversion equation and converting the phase θ 1 As the phase input in the duty cycle Park conversion equation.
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