CN116169695A - VSG control method and system based on frequency-shift phasors - Google Patents

VSG control method and system based on frequency-shift phasors Download PDF

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CN116169695A
CN116169695A CN202310428153.5A CN202310428153A CN116169695A CN 116169695 A CN116169695 A CN 116169695A CN 202310428153 A CN202310428153 A CN 202310428153A CN 116169695 A CN116169695 A CN 116169695A
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CN116169695B (en
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曹欣
鲁宗相
孙荣富
谭建鑫
梅春晓
沙济通
张清清
井延伟
白日欣
李海波
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Xintian Green Energy Co ltd
Tsinghua University
State Grid Jibei Electric Power Co Ltd
Sichuan Energy Internet Research Institute EIRI Tsinghua University
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Xintian Green Energy Co ltd
Tsinghua University
State Grid Jibei Electric Power Co Ltd
Sichuan Energy Internet Research Institute EIRI Tsinghua University
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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
    • H02J3/24—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
    • 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
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The invention provides a VSG control method and a VSG control system based on a frequency-shift phasor, comprising the following steps: judging whether a power grid has faults or frequency disturbance; if yes, a trigger instruction is issued to the fan, a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value are output, and fault ride-through or primary frequency modulation is performed, wherein the method comprises the following steps: determining a control target; generating a current expected value through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system based on a control target; generating a positive and negative sequence current control loop of the VSG frequency-shift phasor model; converting abc phase voltage and current through dq, and calculating through a frequency shift vector to obtain a positive and negative sequence voltage frequency shift phasor model; if not, outputting a module domain decomposition envelope value of the electromagnetic transient signals, rapidly distributing power instructions to each fan according to power grid dispatching requirements, capturing mS-level faults, disturbance, low-high voltage ride-through phenomena and electromechanical and electromagnetic mixed faults, and improving calculation speed while guaranteeing calculation accuracy.

Description

VSG control method and system based on frequency-shift phasors
Technical Field
The invention relates to the technical field of fan control, in particular to a VSG control method and system based on frequency-shift phasors.
Background
With the large-scale wind power plant connected to the power grid, the active supporting technology of the fan to the power grid frequency and voltage is key, a control model of the fan based on frequency shift phasor VSG (virtual synchronous generator technology) is established, primary frequency modulation can be captured and actively supported, and fault ride-through of symmetrical and asymmetrical faults is completed. In recent years, the electromagnetic transient variable calculation generally adopts a dynamic phasor method, and if the method is adopted to calculate higher harmonics, the method can simulate detailed transient signals, but the number of equations is increased, so that the calculated amount is increased, and the calculation speed is reduced.
In view of the above, the invention provides a VSG control method and a VSG control system based on a frequency-shift phasor, which can capture faults, disturbance and low-high voltage ride through phenomena of an alternating current side mS level, can capture electromechanical and electromagnetic mixed faults, and has the advantages that the control time scale of a VSG control circuit is large, the calculation accuracy is ensured, and the calculation speed is improved.
Disclosure of Invention
The invention aims to provide a VSG control method based on a frequency-shift phasor, which comprises the following steps: judging whether a power grid has faults or frequency disturbance; if yes, a trigger instruction is issued to the fan, an electromagnetic transient signal instantaneous value and an electromagnetic transient signal mode domain decomposition envelope value are output by a fan main controller, and fault ride-through or primary frequency modulation is carried out; wherein, carry out fault ride through or primary frequency modulation, include: determining a control target; the control target comprises target power of the virtual synchronous generator, target electromagnetic moment of the virtual synchronous generator and target angular frequency; generating a current expected value through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system based on the control target; generating a positive and negative sequence current control loop of the VSG frequency-shifting phasor model based on the current expected value; converting abc phase voltage and current through dq, and calculating through a frequency shift vector to obtain a positive and negative sequence voltage frequency shift phasor model; if not, outputting a mode domain decomposition envelope value of the electromagnetic transient signal by the fan main controller.
Further, the judging whether the power grid fails or has frequency disturbance is judging whether the first period difference value of each phase of power frequency current signal reaches a preset signal mutation.
Further, the mode domain decomposition envelope value of the electromagnetic transient signal has the expression:
Figure SMS_1
Figure SMS_2
Figure SMS_3
wherein ,
Figure SMS_5
an envelope effective value of the phase a of the grid-side converter,/->
Figure SMS_7
Representing square root->
Figure SMS_9
Voltage cosine signal representing phase a of the grid-side converter,/->
Figure SMS_6
Representing Hilbert transform, ">
Figure SMS_8
The envelope effective value of the phase b of the network-side converter,/->
Figure SMS_10
Voltage cosine signal representing phase b of the grid-side converter,/->
Figure SMS_11
An envelope effective value of the phase c of the network-side converter,/->
Figure SMS_4
And a voltage cosine signal representing the c phase of the grid-side converter. />
The voltage phase value is expressed as a modulo domain decomposition value:
Figure SMS_12
Figure SMS_13
Figure SMS_14
wherein ,
Figure SMS_17
voltage phase value representing phase a, +.>
Figure SMS_19
Representing the imaginary part of the a-phase voltage after Hilbert transformation,
Figure SMS_22
Representing the real part of the original signal of the a-phase voltage, +.>
Figure SMS_16
Representing the voltage phase value of phase b, +.>
Figure SMS_18
Represents the imaginary part of the b-phase voltage after Hilbert transformation,/and>
Figure SMS_21
representing the real part of the original signal of the b-phase voltage, +.>
Figure SMS_23
Voltage phase value representing phase c, +.>
Figure SMS_15
Representing the imaginary part of the c-phase voltage after Hilbert transformation,/and>
Figure SMS_20
representing the real part of the c-phase voltage raw signal.
Further, the expression of the target power of the synchronous generator is:
Figure SMS_24
wherein ,
Figure SMS_25
representing the target power of the synchronous generator, +.>
Figure SMS_26
and
Figure SMS_27
Represents the regulation factor of the direct voltage PI regulator,/->
Figure SMS_28
Indicating motor slip>
Figure SMS_29
Indicating the target value of the DC voltage, ">
Figure SMS_30
Representing the actual value of the direct current voltage;
the expression of the target electromagnetic moment of the synchronous generator is as follows:
Figure SMS_31
wherein ,
Figure SMS_32
representing the target electromagnetic torque of the synchronous generator, +.>
Figure SMS_33
and
Figure SMS_34
Represents the adjustment coefficient of the VSG excitation regulator,
Figure SMS_35
representing the proportionality coefficient>
Figure SMS_36
Representing an integral coefficient;
the target angular frequency is expressed as:
Figure SMS_37
wherein ,
Figure SMS_38
indicating the target angular frequency, +.>
Figure SMS_39
Representing the actual angular frequency +.>
Figure SMS_40
Represents the adjustment proportionality coefficient, J represents the rotational inertia coefficient, D represents the virtual damping coefficient, +.>
Figure SMS_41
Indicating integration->
Figure SMS_42
Representing motor slip, P represents the actual power of the synchronous generator.
Further, the current expected value is expressed as follows:
Figure SMS_43
wherein ,
Figure SMS_52
representing positive sequence current +.>
Figure SMS_47
Projection on d-axis after abc/dq transformation, +>
Figure SMS_48
Representing positive sequence current +.>
Figure SMS_56
Projection on q-axis after abc/dq transformation, +>
Figure SMS_61
Representing negative sequence current +.>
Figure SMS_63
Projection on d-axis after abc/dq transformation, +>
Figure SMS_66
Representing negative sequence current +.>
Figure SMS_53
Projection on q-axis after abc/dq transformation, +>
Figure SMS_58
and
Figure SMS_45
Respectively represent positive sequence current +.>
Figure SMS_50
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure SMS_44
and
Figure SMS_51
Respectively represent negative sequence current +>
Figure SMS_55
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure SMS_59
Representing the target power of the synchronous generator, +.>
Figure SMS_60
Representing net side positive sequence voltage +.>
Figure SMS_64
Projection on d-axis after abc/dq transformation, +>
Figure SMS_62
Representing net side positive sequence voltage +.>
Figure SMS_65
Projection on q-axis after abc/dq transformation, +>
Figure SMS_46
Representing net side positive sequence voltage +.>
Figure SMS_49
Projection on d-axis after abc/dq transformation, +>
Figure SMS_54
Representing net side positive sequence voltage +.>
Figure SMS_57
After abc/dq transformation, projection on q-axis.
Further, the expression of the positive and negative sequence current control loop of the VSG frequency-shift phasor model is as follows:
Figure SMS_67
wherein ,
Figure SMS_69
representing the dq axis positive and negative sequence voltage in the positive and negative sequence current control loop in the VSG model, ++>
Figure SMS_73
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_78
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure SMS_68
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_75
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure SMS_77
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_80
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure SMS_71
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_74
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure SMS_76
System angular frequency indicative of VSG frequency module output,/->
Figure SMS_79
and
Figure SMS_70
Indicating that there is the same angular frequency +.>
Figure SMS_72
Is a periodic signal of (a).
Further, the calculating to obtain the positive and negative sequence voltage frequency-shift phasor model comprises the following steps: solving to obtain the positive and negative sequence voltage of the VSG based on the positive and negative sequence current values; solving to obtain a VSG positive and negative sequence voltage expected value based on the positive and negative sequence current value, the positive and negative sequence voltage and the current expected value; and solving to obtain the positive and negative sequence voltage frequency-shifting phasor model based on the VSG positive and negative sequence voltage expected value.
Further, the expression of the positive and negative sequence voltage frequency-shift phasor model is as follows:
Figure SMS_81
wherein ,
Figure SMS_85
representing the electromotive positive sequence voltage of the converter>
Figure SMS_86
Through abc/dq conversionThen, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure SMS_93
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_82
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure SMS_89
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_90
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure SMS_95
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_84
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure SMS_87
Representing the mode domain decomposition value of the a-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_91
Representing the mode domain decomposition value of the original signal of the a-phase voltage signal after frequency shift conversion, ++>
Figure SMS_94
Representing the mode domain decomposition value of the b-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_83
Representing the mode-domain decomposition value of the original signal of the b-phase voltage signal after frequency shift conversion, ++>
Figure SMS_88
Representing the mode domain decomposition value of the c-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_92
And the mode domain decomposition value after the frequency shift conversion of the original signal of the c-phase voltage signal is represented.
Further, the expression for solving the positive and negative sequence voltages of the VSG is:
Figure SMS_96
wherein ,
Figure SMS_110
representing the electromotive positive sequence voltage of the converter>
Figure SMS_114
Projection on d-axis after abc/dq transformation, +>
Figure SMS_117
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_98
Projection on q-axis after abc/dq transformation, +>
Figure SMS_101
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_104
Projection on d-axis after abc/dq transformation, +>
Figure SMS_107
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_99
Projection on q-axis after abc/dq transformation, +>
Figure SMS_102
Representing net side positive sequence voltage +.>
Figure SMS_109
Projection on d-axis after abc/dq transformation, +>
Figure SMS_113
Representing net side positive sequence voltage +.>
Figure SMS_100
Projection on q-axis after abc/dq transformation, +>
Figure SMS_105
Representing net side positive sequence voltage +.>
Figure SMS_108
Projection on d-axis after abc/dq transformation, +>
Figure SMS_112
Representing net side positive sequence voltage +.>
Figure SMS_116
Projection on q-axis after abc/dq transformation, +>
Figure SMS_118
Representing positive sequence current +.>
Figure SMS_119
Projection on d-axis after abc/dq transformation, +>
Figure SMS_120
Representing positive sequence current +.>
Figure SMS_97
Projection on q-axis after abc/dq transformation, +>
Figure SMS_103
Representing negative sequence current +.>
Figure SMS_106
Projection on d-axis after abc/dq transformation, +>
Figure SMS_111
Representing negative sequence current +.>
Figure SMS_115
After abc/dq transformation, projection on q-axis;
the expression for solving the VSG positive and negative sequence voltage expected value is as follows:
Figure SMS_121
wherein ,
Figure SMS_139
representing the electromotive positive sequence voltage of the converter>
Figure SMS_145
Projection on d-axis after abc/dq transformation, +>
Figure SMS_149
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_124
Projection on q-axis after abc/dq transformation, +>
Figure SMS_129
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_133
Projection on d-axis after abc/dq transformation, +>
Figure SMS_134
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_147
Projection on q-axis after abc/dq transformation,,, is->
Figure SMS_153
Representing net side positive sequence voltage +.>
Figure SMS_155
Projection on d-axis after abc/dq transformation, +>
Figure SMS_157
Representing net side positive sequence voltage +.>
Figure SMS_151
Projection on q-axis after abc/dq transformation, +>
Figure SMS_154
Representing net side positive sequence voltage +.>
Figure SMS_156
Projection on d-axis after abc/dq transformation, +>
Figure SMS_158
Representing net side positive sequence voltage +.>
Figure SMS_138
Projection on q-axis after abc/dq transformation, +>
Figure SMS_144
Scale factor representing current PI controller, +.>
Figure SMS_146
Integration coefficient representing current PI controller, +.>
Figure SMS_152
Indicating integration->
Figure SMS_123
Indicating motor slip>
Figure SMS_127
Representing positive sequence current +.>
Figure SMS_132
Projection on d-axis after abc/dq transformation, +>
Figure SMS_137
Representation->
Figure SMS_125
Is>
Figure SMS_128
Representing positive sequence current +.>
Figure SMS_130
Projection on q-axis after abc/dq transformation, +>
Figure SMS_135
Representation->
Figure SMS_140
Is>
Figure SMS_142
Representing negative sequence current +.>
Figure SMS_148
Projection on d-axis after abc/dq transformation, +>
Figure SMS_150
Representation->
Figure SMS_122
Is>
Figure SMS_126
Representing negative sequence current +.>
Figure SMS_131
After abc/dq transformation, projection on the q-axis,
Figure SMS_136
representation->
Figure SMS_141
Is>
Figure SMS_143
And the system angular frequency output by the VSG frequency module is represented, and L represents the total inductance of the power grid.
The invention aims to provide a VSG control system based on a frequency-shift phasor, which comprises a judging module, a first control module and a second control module; the judging module is used for judging whether the power grid has faults or frequency disturbance; the first control module is used for issuing a trigger instruction to the fan when the power grid fails or has frequency disturbance, and the fan main controller outputs a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value and performs fault ride-through or primary frequency modulation; wherein, carry out fault ride through or primary frequency modulation, include: determining a control target; the control target comprises target power of the virtual synchronous generator, target electromagnetic moment of the virtual synchronous generator and target angular frequency; the current control strategy of the grid-side converter considers the suppression of the negative sequence current of the alternating current side, and generates a current expected value according to the power target value of the grid-side converter by a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system; generating a positive and negative sequence current control loop of the VSG frequency-shifting phasor model based on the current expected value; converting abc phase voltage and current through dq, and calculating through a frequency shift vector to obtain a positive and negative sequence voltage frequency shift phasor model; and the second control module is used for outputting a mode domain decomposition envelope value of the electromagnetic transient signal by the fan main controller when the power grid does not have faults or frequency disturbance.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
according to the VSG control method and system for the frequency-shifting phasor, when a power grid fails or has frequency disturbance, signal capturing and control of electromagnetic-electromechanical multi-time scale are achieved, a mode domain decomposition envelope value of an electromagnetic instantaneous value and an electromagnetic transient signal is flexibly output, an envelope line of an alternating current signal is interacted with a wind power plant controller when no failure and disturbance occur, whether a fan enters a failure crossing mode and a primary frequency modulation mode can be rapidly judged, and under the failure crossing mode and the primary frequency modulation mode, an electromagnetic instantaneous signal and an envelope waveform signal are simultaneously output by a VSG frequency adjusting module, a virtual excitation adjusting module and a voltage-current control module of a fan grid side converter, so that the calculation speed of the VSG frequency-shifting phasor control model of a direct-drive fan is obviously improved while calculation accuracy is guaranteed.
According to the VSG control method and the VSG control system for the frequency-shift phasor, provided by the embodiments of the invention, compared with the VSG frequency-shift phasor model control under the symmetrical condition, a negative sequence current loop is added, so that asymmetrical faults can be effectively identified, and negative sequence current can be restrained as required. The positive sequence component and the negative sequence component under dq coordinates are obtained through a d, q axis voltage and current sequence component decomposition method, specifically, the dq axis voltage and current are firstly transformed through dq/abc to obtain the relationship between the dq axis positive and negative sequence voltages and A, B, C three-phase voltages, and a positive and negative sequence voltage frequency-shift phasor model is deduced through frequency-shift phasor calculation.
According to the VSG control method and the VSG control system for the frequency-shifting phasors, provided by some embodiments of the invention, power frequency carriers on an alternating side are removed, other frequency band information except power frequency is reserved, signal capturing and control of electromagnetic-electromechanical multi-time scale is realized by adjusting time step, and an electromagnetic instantaneous value and a mode domain decomposition envelope value of an electromagnetic transient signal are flexibly output.
Drawings
FIG. 1 is an exemplary flow chart of a VSG control method based on a frequency-shifted phasor according to some embodiments of the present invention;
fig. 2 is an exemplary block diagram of a VSG control system based on a frequency-shifted phasor according to some embodiments of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Fig. 1 is an exemplary flowchart of a VSG control method based on a frequency-shifted phasor according to some embodiments of the present invention. In some embodiments, the process 100 may be performed by the system 200. As shown in fig. 1, the process 100 may include the following:
step 110, it is determined whether a fault or a frequency disturbance occurs in the power grid.
In some embodiments, a signal trigger may be installed at a PCC (point of common connection), and whether the first period difference value of each phase of power frequency current signal reaches a preset signal abrupt change is used as a trigger condition, and logic operation is performed on the judgment results of all phases, and the trigger is performed when the logic operation output is yes. The preset abrupt signal change may refer to preset maximum and minimum values of the power current signal of each phase.
And 120, if the power grid fails or has frequency disturbance, a trigger instruction is issued to the fan, and a fan main controller outputs a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value and performs fault ride-through or primary frequency modulation.
In some embodiments, the mode-domain decomposition envelope value of the electromagnetic transient signal of the three-phase voltage is expressed as:
Figure SMS_159
Figure SMS_160
Figure SMS_161
wherein ,
Figure SMS_164
an envelope effective value of the phase a of the grid-side converter,/->
Figure SMS_165
Representing square root->
Figure SMS_168
Voltage cosine signal representing phase a of the grid-side converter,/->
Figure SMS_163
Representing Hilbert transform, ">
Figure SMS_166
The envelope effective value of the phase b of the network-side converter,/->
Figure SMS_167
Voltage cosine signal representing phase b of the grid-side converter,/->
Figure SMS_169
An envelope effective value of the phase c of the network-side converter,/->
Figure SMS_162
The voltage cosine signal representing the c phase of the grid-side converter, t representing the time variable.
The mode decomposition value of the voltage phase is expressed as:
Figure SMS_170
Figure SMS_171
Figure SMS_172
wherein ,
Figure SMS_175
voltage phase value representing phase a, +.>
Figure SMS_177
Representing the imaginary part of the a-phase voltage after Hilbert transformation,
Figure SMS_180
Representing the real part of the original signal of the a-phase voltage, +.>
Figure SMS_173
Representing the phase value of the b-phase voltage,/-, and>
Figure SMS_176
represents the imaginary part of the b-phase voltage after Hilbert transformation,/and>
Figure SMS_179
representing the real part of the original signal of the b-phase voltage, +.>
Figure SMS_181
Voltage phase value representing phase c, +.>
Figure SMS_174
Representing the imaginary part of the c-phase voltage after Hilbert transformation,/and>
Figure SMS_178
representing the real part of the c-phase voltage raw signal, t representing the time variable.
In some embodiments, the a-phase voltage of the grid-side converter may be Va (t) =
Figure SMS_182
Wherein Va (t) represents an a-phase voltage cosine signal of the grid-side converter, ">
Figure SMS_183
The voltage amplitude. The signal Va (t) is convolved with 1/(pi t) by hilbert transformation of the a-phase voltage of the grid-side converter to obtain Va' (t). Thus, the Hilbert transform result Va' (t) can be interpreted as the output of a linear time invariant system whose input is Va (t) and whose sampled impulse response is 1/(pi t) used to describe the complex envelope of a signal modulated with a real valued carrier to obtain an resolved signal, which can be used to calculate the envelope (instantaneous amplitude) and instantaneous phase. The expression of the a-phase voltage analysis signal obtained by Jing Xier Bert transformation is as follows:
Figure SMS_184
wherein ,
Figure SMS_185
representation parsingSignal (I)>
Figure SMS_186
Represents a phase voltage magnitude,
Figure SMS_187
Indicating the phase difference, i.e. the integral of the angular frequency difference.
Frequency shift conversion is carried out on the a-phase voltage analysis signal to obtain an electromagnetic transient signal instantaneous value, wherein the expression of the electromagnetic transient signal instantaneous value is as follows:
Figure SMS_188
the same applies to the b-phase and c-phase voltages and the a, b, c-phase currents:
Figure SMS_189
Figure SMS_190
Figure SMS_191
Figure SMS_192
Figure SMS_193
wherein the phase difference
Figure SMS_194
The expression of (2) is:
Figure SMS_195
wherein ,
Figure SMS_196
represents the adjustment proportionality coefficient, J represents the rotational inertia coefficient, D represents the virtual damping coefficient, +.>
Figure SMS_197
The integral is represented by a representation of the integral,
Figure SMS_198
indicating motor slip>
Figure SMS_199
The target power of the synchronous generator is represented, P represents the actual power of the synchronous generator, and t represents a time variable.
Deviation of angular frequency
Figure SMS_200
The expression of (2) is:
Figure SMS_201
wherein ,
Figure SMS_202
indicating the target angular frequency, +.>
Figure SMS_203
Representing the actual angular frequency.
Moment of inertia
Figure SMS_204
The expression of (2) is:
Figure SMS_205
the expression of the reactive voltage control strategy of the VSG control module is as follows:
Figure SMS_206
wherein ,
Figure SMS_207
representing reactive power target value,/->
Figure SMS_208
Representing the current value of reactive power,/, for>
Figure SMS_209
Representing the voltage regulation factor, ">
Figure SMS_210
Representing a voltage regulation target value,/-, and%>
Figure SMS_211
Representing the grid voltage.
Wherein, carry out fault ride through or primary frequency modulation, include:
determining a control target; the control targets include a target power of the synchronous generator, a target electromagnetic torque of the synchronous generator, and a target angular frequency.
The expression of the target power of the synchronous generator is:
Figure SMS_212
wherein ,
Figure SMS_213
representing the target power of the synchronous generator, +.>
Figure SMS_214
and
Figure SMS_215
Represents the regulation factor of the direct voltage PI regulator,/->
Figure SMS_216
Indicating integration->
Figure SMS_217
Indicating motor slip>
Figure SMS_218
Indicating the target value of the DC voltage, ">
Figure SMS_219
Representing the actual value of the dc voltage.
The expression of the target electromagnetic torque of the synchronous generator is as follows:
Figure SMS_220
wherein ,
Figure SMS_221
representing the target electromagnetic torque of the synchronous generator, +.>
Figure SMS_222
and
Figure SMS_223
Represents the adjustment coefficient of the VSG excitation regulator,
Figure SMS_224
representing the proportionality coefficient>
Figure SMS_225
Representing the integral coefficient.
The target angular frequency is expressed as:
Figure SMS_226
wherein ,
Figure SMS_227
indicating the target angular frequency, +.>
Figure SMS_228
Representing the actual angular frequency +.>
Figure SMS_229
Represents the adjustment proportionality coefficient, J represents the rotational inertia coefficient, D represents the virtual damping coefficient, +.>
Figure SMS_230
Indicating integration->
Figure SMS_231
Representing motor slip, P represents the actual power of the synchronous generator.
Based on a control target, a current expected value is generated through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system.
In some embodiments, the grid-side converter current control strategy may consider suppressing ac-side negative sequence current for asymmetric fault ride-through and current compensation. Generating a dq axis current expected value of the grid-side converter according to the power of the grid-side converter when the power grid is unbalanced, wherein the current expected value has the following expression:
Figure SMS_232
wherein ,
Figure SMS_236
representing positive sequence current +.>
Figure SMS_238
Projection on d-axis after abc/dq transformation, +>
Figure SMS_242
Representing positive sequence current +.>
Figure SMS_235
Projection on q-axis after abc/dq transformation, +>
Figure SMS_239
Representing negative sequence current +.>
Figure SMS_244
Projection on d-axis after abc/dq transformation, +>
Figure SMS_248
Representing negative sequence current +.>
Figure SMS_234
Projection on q-axis after abc/dq transformation, +>
Figure SMS_237
and
Figure SMS_241
Respectively represent positive sequence current +.>
Figure SMS_246
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure SMS_250
and
Figure SMS_252
Respectively represent negative sequence current +>
Figure SMS_255
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure SMS_257
Representing the target power of the synchronous generator, and outputting by a VSG power module after considering the conditions such as side output power, direct current voltage fluctuation and the like>
Figure SMS_249
Representing net side positive sequence voltage +.>
Figure SMS_254
Projection on d-axis after abc/dq transformation, +>
Figure SMS_258
Representing net side positive sequence voltage +.>
Figure SMS_259
Projection on q-axis after abc/dq transformation, +>
Figure SMS_233
Indicating the net side is positiveSequence voltage->
Figure SMS_240
Projection on d-axis after abc/dq transformation, +>
Figure SMS_243
Representing net side positive sequence voltage +.>
Figure SMS_245
After abc/dq transformation, projection on the q-axis,
Figure SMS_247
representing net side positive sequence current,/->
Figure SMS_251
Representing net side negative sequence current,/->
Figure SMS_253
Representing the net side positive sequence voltage,/->
Figure SMS_256
Representing the net side negative sequence voltage.
Based on the current expected value, generating a VSG frequency-shift phasor model positive and negative sequence current control loop.
In some embodiments, the expression of the VSG frequency-shifted phasor model positive and negative sequence current control loop is:
Figure SMS_260
wherein ,
Figure SMS_263
representing the dq axis positive and negative sequence voltage in the positive and negative sequence current control loop in the VSG model, ++>
Figure SMS_268
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_271
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure SMS_264
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_265
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure SMS_270
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_273
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure SMS_262
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_267
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure SMS_269
System angular frequency indicative of VSG frequency module output,/->
Figure SMS_272
and
Figure SMS_261
Indicating that there is the same angular frequency +.>
Figure SMS_266
Is a periodic signal of (a).
And obtaining a positive and negative sequence voltage frequency-shift phasor model by performing dq conversion on abc phase voltage and current and calculating a frequency-shift vector.
In some embodiments, the calculating the positive and negative sequence voltage shift phasor model includes:
and solving to obtain the VSG positive and negative sequence voltage based on the positive and negative sequence current value.
In some embodiments, the expression for solving the VSG positive and negative sequence voltages is:
Figure SMS_274
wherein ,
Figure SMS_291
representing the electromotive positive sequence voltage of the converter>
Figure SMS_294
Projection on d-axis after abc/dq transformation, +>
Figure SMS_297
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_277
Projection on q-axis after abc/dq transformation, +>
Figure SMS_280
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_286
Projection on d-axis after abc/dq transformation, +>
Figure SMS_287
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_279
Projection on q-axis after abc/dq transformation, +>
Figure SMS_284
Representing net side positive sequence voltage +.>
Figure SMS_289
Projection on d-axis after abc/dq transformation, +>
Figure SMS_292
Representing net side positive sequence voltage +.>
Figure SMS_293
Projection on q-axis after abc/dq transformation, +>
Figure SMS_295
Representing net side positive sequence voltage +.>
Figure SMS_296
Projection on d-axis after abc/dq transformation, +>
Figure SMS_298
Representing net side positive sequence voltage +.>
Figure SMS_276
Projection on q-axis after abc/dq transformation, +>
Figure SMS_282
Representing positive sequence current +.>
Figure SMS_283
Projection on d-axis after abc/dq transformation, +>
Figure SMS_290
Representing positive sequence current +.>
Figure SMS_275
Projection on q-axis after abc/dq transformation, +>
Figure SMS_281
Representing negative sequence current +.>
Figure SMS_285
Projection on d-axis after abc/dq transformation, +>
Figure SMS_288
Representing negative sequence current +.>
Figure SMS_278
After abc/dq transformation, projection on q-axis.
And solving to obtain the VSG positive and negative sequence voltage expected value based on the positive and negative sequence current value, the positive and negative sequence voltage and the current expected value.
In some embodiments, the expression for solving the VSG positive and negative sequence voltage expectation is:
Figure SMS_299
wherein ,
Figure SMS_316
representing the electromotive positive sequence voltage of the converter>
Figure SMS_320
Projection on d-axis after abc/dq transformation, +>
Figure SMS_325
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_300
Projection on q-axis after abc/dq transformation, +>
Figure SMS_305
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_309
Projection on d-axis after abc/dq transformation, +>
Figure SMS_315
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_310
Projection on q-axis after abc/dq transformation, +>
Figure SMS_312
Representing net side positive sequence voltage +.>
Figure SMS_319
Projection on d-axis after abc/dq transformation, +>
Figure SMS_323
Representing net side positive sequence voltage +.>
Figure SMS_327
Projection on q-axis after abc/dq transformation, +>
Figure SMS_332
Representing net side positive sequence voltage +.>
Figure SMS_334
Projection on d-axis after abc/dq transformation, +>
Figure SMS_336
Representing net side positive sequence voltage +.>
Figure SMS_317
Projection on q-axis after abc/dq transformation, +>
Figure SMS_321
Scale factor representing current PI controller, +.>
Figure SMS_326
Integration coefficient representing current PI controller, +.>
Figure SMS_329
Indicating integration->
Figure SMS_301
Indicating motor slip>
Figure SMS_307
Representing positive sequence current +.>
Figure SMS_311
Projection on d-axis after abc/dq transformation, +>
Figure SMS_313
Representation->
Figure SMS_318
Is>
Figure SMS_322
Representing positive sequence current +.>
Figure SMS_324
Projection on q-axis after abc/dq transformation, +>
Figure SMS_330
Representation->
Figure SMS_328
Is>
Figure SMS_331
Representing negative sequence current +.>
Figure SMS_333
Projection on d-axis after abc/dq transformation, +>
Figure SMS_335
Representation->
Figure SMS_302
Is>
Figure SMS_306
Representing negative sequence current +.>
Figure SMS_308
After abc/dq transformation, projection on the q-axis,
Figure SMS_314
representation->
Figure SMS_303
Is>
Figure SMS_304
And the system angular frequency output by the VSG frequency module is represented, and L represents the total inductance of the power grid.
And solving to obtain a positive and negative sequence voltage frequency-shifting phasor model based on the VSG positive and negative sequence voltage expected value. In some embodiments, the positive and negative sequence voltage shift phasor model is expressed as:
Figure SMS_337
wherein ,
Figure SMS_339
representing the electromotive positive sequence voltage of the converter>
Figure SMS_343
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure SMS_348
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_341
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure SMS_342
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_347
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure SMS_351
Representing the electromotive positive sequence voltage of the converter>
Figure SMS_338
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure SMS_345
Representing the mode domain decomposition value of the a-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_349
Representing the mode domain decomposition value of the original signal of the a-phase voltage signal after frequency shift conversion, ++>
Figure SMS_350
Representing the mode domain decomposition value of the b-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_340
Representing the mode-domain decomposition value of the original signal of the b-phase voltage signal after frequency shift conversion, ++>
Figure SMS_344
Representing the mode domain decomposition value of the c-phase voltage signal after Hilbert and frequency shift conversion,
Figure SMS_346
The mode domain decomposition value after the original signal of the c-phase voltage signal is frequency-shifted and converted is represented by t, and the time variable is represented by t.
And 130, outputting a mode domain decomposition envelope value of the electromagnetic transient signal by the fan main controller if the power grid does not have faults or frequency disturbance.
Fig. 2 is an exemplary block diagram of a VSG control system based on a frequency-shifted phasor according to some embodiments of the present invention. As shown in fig. 2, the system 200 includes a determination module 210, a first control module 220, and a second control module 230.
The determining module 210 is configured to determine whether a power grid fails or has a frequency disturbance. For more details on the determination module 210, see FIG. 1 and its associated description.
The first control module 220 is configured to issue a trigger instruction to the fan when the power grid fails or the frequency is disturbed, and the fan main controller outputs a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value, and performs fault ride-through or primary frequency modulation; wherein, carry out fault ride through or primary frequency modulation, include: determining a control target; the control target comprises target power of the synchronous generator, target electromagnetic moment of the synchronous generator and target angular frequency; generating a current expected value through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system based on the control target; generating a positive and negative sequence current control loop of the VSG frequency-shifting phasor model based on the current expected value; and obtaining a positive and negative sequence voltage frequency-shift phasor model by performing dq conversion on abc phase voltage and current and calculating a frequency-shift vector. For more details on the first control module 220, see FIG. 1 and its associated description.
The second control module 230 is configured to output, by the fan main controller, a mode-domain decomposition envelope value of the electromagnetic transient signal when the power grid is not faulty or frequency perturbed. For more details on the second control module 230, see FIG. 1 and its associated description.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for controlling a VSG based on a frequency-shifted phasor, comprising:
judging whether a power grid has faults or frequency disturbance;
if yes, a trigger instruction is issued to the fan, and a main fan controller outputs a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value and performs fault ride-through or primary frequency modulation; wherein, carry out fault ride through or primary frequency modulation, include:
determining a control target; the control target comprises target power of the virtual synchronous generator, target electromagnetic moment of the virtual synchronous generator and target angular frequency;
generating a current expected value through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system based on the control target;
generating a positive and negative sequence current control loop of the VSG frequency-shifting phasor model based on the current expected value;
converting abc phase voltage and current through dq, and calculating through a frequency shift vector to obtain a positive and negative sequence voltage frequency shift phasor model;
if not, outputting a mode domain decomposition envelope value of the electromagnetic transient signal by the fan main controller.
2. The VSG control method of claim 1, wherein the determining whether the power grid fails or has a frequency disturbance is determining whether the first period difference of each phase of the power frequency current signal reaches a preset signal mutation.
3. The method for controlling VSG based on frequency-shifted phasors according to claim 1, wherein,
the expression of the mode domain decomposition envelope value of the electromagnetic transient signal is as follows:
Figure QLYQS_1
Figure QLYQS_2
Figure QLYQS_3
wherein ,
Figure QLYQS_4
an envelope effective value of the phase a of the grid-side converter,/->
Figure QLYQS_7
Representing square root->
Figure QLYQS_10
Voltage cosine signal representing phase a of the grid-side converter,/->
Figure QLYQS_6
Representing Hilbert transform, ">
Figure QLYQS_8
The envelope effective value of the phase b of the network-side converter,/->
Figure QLYQS_9
Voltage cosine signal representing phase b of the grid-side converter,/->
Figure QLYQS_11
An envelope effective value of the phase c of the network-side converter,/->
Figure QLYQS_5
A voltage cosine signal representing the c phase of the grid-side converter;
the voltage phase value is expressed as a modulo domain decomposition value:
Figure QLYQS_12
Figure QLYQS_13
Figure QLYQS_14
wherein ,
Figure QLYQS_16
voltage phase value representing phase a, +.>
Figure QLYQS_18
Representing the imaginary part of the a-phase voltage after hilbert transformation,
Figure QLYQS_22
representing the real part of the original signal of the a-phase voltage, +.>
Figure QLYQS_17
Representing the voltage phase value of phase b, +.>
Figure QLYQS_19
Representing the b-phase voltage via HilbertImaginary part after transformation, ++>
Figure QLYQS_20
Representing the real part of the original signal of the b-phase voltage, +.>
Figure QLYQS_23
Voltage phase value representing phase c, +.>
Figure QLYQS_15
Representing the imaginary part of the c-phase voltage after Hilbert transformation,/and>
Figure QLYQS_21
representing the real part of the c-phase voltage raw signal.
4. The method for controlling VSG based on frequency-shifted phasors according to claim 1, wherein,
the expression of the target power of the synchronous generator is as follows:
Figure QLYQS_24
wherein ,
Figure QLYQS_25
representing the target power of the synchronous generator, +.>
Figure QLYQS_26
and
Figure QLYQS_27
Represents the regulation factor of the direct voltage PI regulator,/->
Figure QLYQS_28
Indicating motor slip>
Figure QLYQS_29
Indicating the target value of the DC voltage, ">
Figure QLYQS_30
Representing the actual value of the direct current voltage;
the expression of the target electromagnetic moment of the synchronous generator is as follows:
Figure QLYQS_31
wherein ,
Figure QLYQS_32
representing the target electromagnetic torque of the synchronous generator, +.>
Figure QLYQS_33
and
Figure QLYQS_34
Represents the VSG excitation regulator regulation factor, < ->
Figure QLYQS_35
Representing the proportionality coefficient>
Figure QLYQS_36
Representing an integral coefficient;
the target angular frequency is expressed as:
Figure QLYQS_37
wherein ,
Figure QLYQS_38
indicating the target angular frequency, +.>
Figure QLYQS_39
Representing the actual angular frequency +.>
Figure QLYQS_40
Representing the turndown ratioExample coefficient, J represents the moment of inertia coefficient, D represents the virtual damping coefficient, < >>
Figure QLYQS_41
P represents the actual power of the synchronous generator.
5. The method of claim 1, wherein the current expectation is expressed as:
Figure QLYQS_42
wherein ,
Figure QLYQS_56
representing positive sequence current +.>
Figure QLYQS_51
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_52
Representing positive sequence current +.>
Figure QLYQS_55
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_59
Representing negative sequence current +.>
Figure QLYQS_57
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_60
Representing negative sequence current +.>
Figure QLYQS_62
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_65
and
Figure QLYQS_43
Respectively represent positive sequence current +.>
Figure QLYQS_54
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure QLYQS_58
and
Figure QLYQS_61
Respectively represent negative sequence current +>
Figure QLYQS_63
After abc/dq transformation, the projection on d-axis and q-axis is expected,/-axis>
Figure QLYQS_64
Representing the target power of the synchronous generator, +.>
Figure QLYQS_45
Representing net side positive sequence voltage +.>
Figure QLYQS_48
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_50
Representing net side positive sequence voltage +.>
Figure QLYQS_53
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_44
Representing net side positive sequence voltage +.>
Figure QLYQS_49
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_46
Representing net side positive sequence voltage +.>
Figure QLYQS_47
After abc/dq transformation, projection on q-axis.
6. The VSG control method of claim 1, wherein the VSG frequency-shifted phasor model positive and negative sequence current control loop has the following expression:
Figure QLYQS_66
wherein ,
Figure QLYQS_68
representing the dq axis positive and negative sequence voltage in the positive and negative sequence current control loop in the VSG model, ++>
Figure QLYQS_71
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_74
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure QLYQS_69
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_72
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure QLYQS_75
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_77
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure QLYQS_67
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_76
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure QLYQS_78
System angular frequency indicative of VSG frequency module output,/->
Figure QLYQS_79
and
Figure QLYQS_70
Indicating that there is the same angular frequency +.>
Figure QLYQS_73
Is a periodic signal of (a).
7. The VSG control method of claim 1, wherein the calculating the positive and negative sequence voltage-shift phasor model comprises:
solving to obtain the positive and negative sequence voltage of the VSG based on the positive and negative sequence current values;
solving to obtain a VSG positive and negative sequence voltage expected value based on the positive and negative sequence current value, the positive and negative sequence voltage and the current expected value;
and solving to obtain the positive and negative sequence voltage frequency-shifting phasor model based on the VSG positive and negative sequence voltage expected value.
8. The method for controlling VSG of claim 7, wherein the positive and negative sequence voltage-shift phasor model has the expression:
Figure QLYQS_80
wherein ,
Figure QLYQS_82
representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_87
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure QLYQS_89
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_84
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure QLYQS_85
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_88
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the d-axis, +.>
Figure QLYQS_90
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_81
After abc/dq transformation, a voltage-shifted phasor model of the expected value of the projection on the q-axis, +.>
Figure QLYQS_91
Representing the mode domain decomposition value of the a-phase voltage signal after Hilbert and frequency shift conversion,
Figure QLYQS_93
Representing the mode domain decomposition value of the original signal of the a-phase voltage signal after frequency shift conversion, ++>
Figure QLYQS_94
Representing the mode domain decomposition value of the b-phase voltage signal after Hilbert and frequency shift conversion,
Figure QLYQS_83
Representing the mode-domain decomposition value of the original signal of the b-phase voltage signal after frequency shift conversion, ++>
Figure QLYQS_86
Representing the mode domain decomposition value of the c-phase voltage signal after Hilbert and frequency shift conversion,
Figure QLYQS_92
And the mode domain decomposition value after the frequency shift conversion of the original signal of the c-phase voltage signal is represented.
9. The VSG control method of claim 8, wherein the solving the expression of the VSG positive and negative sequence voltages is:
Figure QLYQS_95
wherein ,
Figure QLYQS_111
representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_114
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_117
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_97
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_100
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_104
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_110
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_102
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_107
Representing net side positive sequence voltage +.>
Figure QLYQS_113
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_116
Representing net side positive sequence voltage +.>
Figure QLYQS_112
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_115
Representing net side positive sequence voltage +.>
Figure QLYQS_118
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_119
Representing net side positive sequence voltage +.>
Figure QLYQS_99
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_103
Representing positive sequence current +.>
Figure QLYQS_106
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_108
Representing positive sequence current +.>
Figure QLYQS_96
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_101
Representing negative sequence current +.>
Figure QLYQS_105
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_109
Representing negative sequence current +.>
Figure QLYQS_98
After abc/dq transformation, projection on q-axis;
the expression for solving the VSG positive and negative sequence voltage expected value is as follows:
Figure QLYQS_120
wherein ,
Figure QLYQS_133
representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_137
After the conversion of abc/dq, the conversion is carried out,the expected value of the projection on the d-axis,
Figure QLYQS_139
representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_123
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure QLYQS_125
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_127
After abc/dq transformation, the projection on the d-axis is expected, +.>
Figure QLYQS_129
Representing the electromotive positive sequence voltage of the converter>
Figure QLYQS_143
After abc/dq transformation, the projection on the q-axis is expected, +.>
Figure QLYQS_147
Representing net side positive sequence voltage +.>
Figure QLYQS_148
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_151
Representing net side positive sequence voltage +.>
Figure QLYQS_149
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_152
Representing net side positive sequence voltage +.>
Figure QLYQS_154
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_156
Representing net side positive sequence voltage +.>
Figure QLYQS_145
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_150
Scale factor representing current PI controller, +.>
Figure QLYQS_153
Integration coefficient representing current PI controller, +.>
Figure QLYQS_155
Indicating motor slip>
Figure QLYQS_121
Representing positive sequence current +.>
Figure QLYQS_134
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_141
Representation->
Figure QLYQS_146
Is>
Figure QLYQS_131
Representing positive sequence current +.>
Figure QLYQS_136
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_138
Representation->
Figure QLYQS_142
Is>
Figure QLYQS_132
Representing negative sequence current +.>
Figure QLYQS_135
Projection on d-axis after abc/dq transformation, +>
Figure QLYQS_140
Representation->
Figure QLYQS_144
Is>
Figure QLYQS_122
Representing negative sequence current +.>
Figure QLYQS_124
Projection on q-axis after abc/dq transformation, +>
Figure QLYQS_126
Representation->
Figure QLYQS_128
Is>
Figure QLYQS_130
And the system angular frequency output by the VSG frequency module is represented, and L represents the total inductance of the power grid.
10. The VSG control system based on the frequency-shift phasor is characterized by comprising a judging module, a first control module and a second control module;
the judging module is used for judging whether the power grid has faults or frequency disturbance;
the first control module is used for issuing a trigger instruction to the fan when the power grid fails or has frequency disturbance, and the fan main controller outputs a mode domain decomposition envelope value of the electromagnetic transient signal and an electromagnetic transient signal instantaneous value and performs fault ride-through or primary frequency modulation; wherein, carry out fault ride through or primary frequency modulation, include:
determining a control target; the control target comprises target power of the virtual synchronous generator, target electromagnetic moment of the virtual synchronous generator and target angular frequency;
generating a current expected value through a double dq positive and negative sequence current PI control strategy of a positive and negative rotation synchronous rotation coordinate system based on the control target;
generating a positive and negative sequence current control loop of the VSG frequency-shifting phasor model based on the current expected value;
converting abc phase voltage and current through dq, and calculating through a frequency shift vector to obtain a positive and negative sequence voltage frequency shift phasor model;
and the second control module is used for outputting a mode domain decomposition envelope value of the electromagnetic transient signal by the fan main controller when the power grid does not have faults or frequency disturbance.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109088436A (en) * 2018-09-26 2018-12-25 国家电网有限公司 VSC multi-scale transient modeling method
CN109659978A (en) * 2019-01-09 2019-04-19 国网宁夏电力有限公司电力科学研究院 A kind of the virtual synchronous generator control method and control system of auto-adaptive parameter
US10942204B1 (en) * 2020-10-27 2021-03-09 North China Electric Power University Taylor weighted least squares method for estimating synchrophasor
CN114825395A (en) * 2022-05-31 2022-07-29 武汉大学 Control strategy of flywheel energy storage network side converter under power grid asymmetric fault
CN115622005A (en) * 2022-10-21 2023-01-17 国网湖北省电力有限公司荆州供电公司 High-permeability photovoltaic power distribution network relay protection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109088436A (en) * 2018-09-26 2018-12-25 国家电网有限公司 VSC multi-scale transient modeling method
CN109659978A (en) * 2019-01-09 2019-04-19 国网宁夏电力有限公司电力科学研究院 A kind of the virtual synchronous generator control method and control system of auto-adaptive parameter
US10942204B1 (en) * 2020-10-27 2021-03-09 North China Electric Power University Taylor weighted least squares method for estimating synchrophasor
CN114825395A (en) * 2022-05-31 2022-07-29 武汉大学 Control strategy of flywheel energy storage network side converter under power grid asymmetric fault
CN115622005A (en) * 2022-10-21 2023-01-17 国网湖北省电力有限公司荆州供电公司 High-permeability photovoltaic power distribution network relay protection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
翟登辉;王鹏;辛军;任志航;杨东海;: "具备VSG特征并网变流器的预同步及主动孤岛判别方法研究", 电测与仪表, no. 15 *

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