CN116191518B - Automatic output power adjusting method and device of energy storage inverter and computer equipment - Google Patents
Automatic output power adjusting method and device of energy storage inverter and computer equipment Download PDFInfo
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
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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
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M7/53875—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 analogue control of three-phase output
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Abstract
The application discloses an automatic output power adjusting method, device and computer equipment of an energy storage inverter, wherein the operating mode of the energy storage inverter can be judged by acquiring operating parameters of a plurality of energy storage inverters, when the energy storage inverter is in an independent operating mode, whether a load is nonlinear or not is judged, if so, a first output voltage of the energy storage inverter is acquired, dynamic harmonic suppression is carried out on the first output voltage based on a repeated control system, so that the first output voltage has a steady voltage waveform, the dynamic adjustment of the output power of the energy storage inverter is facilitated, and the stable operation of a power grid system is further enhanced; when the grid-connected operation is performed, three-phase reference voltages are obtained, a first duty ratio is calculated, output power is adjusted through the first duty ratio, so that three-phase power is in a more proper power output environment, the first duty ratio is corrected, pulse width modulation is generated according to the corrected duty ratio, and the energy storage inverter dynamically adjusts the output power according to the pulse width modulation.
Description
Technical Field
The present disclosure relates to the field of energy storage inverters, and in particular, to a method and an apparatus for automatically adjusting output power of an energy storage inverter, and a computer device.
Background
With the rapid development of global industry and economy, non-renewable energy sources such as coal, petroleum and the like are increasingly exhausted, environmental pressure caused by fossil fuels is prominent, survival and living conditions of human beings are seriously affected, so that development and utilization of renewable new energy sources are becoming more and more important, and with the deep environmental protection, people are converting and generating electric energy by using green energy sources. However, the biggest problem of these green energy power generation is that the energy output is not stable, for example, solar energy varies with circadian rhythm, weather variation, and seasonal rotation. Wind energy is seasonal and random, and periodic changes exist in ocean energy, so that when the energy sources are used for generating electricity, the power of the generated electric energy also has obvious fluctuation and intermittence. In order to reduce the influence of new energy power generation on the stability of a power generation system, an energy storage battery is generally adopted to buffer electric energy, and then the electric energy is integrated into a power grid through an energy storage inverter, so that the energy storage inverter is used as a core component of the energy storage system, is an interface between an energy storage device and the power grid, has important significance for safe and stable operation of the power grid, however, the storage capacity of the energy storage battery is fixed, and the frequency change of the power grid has certain randomness, so that the output power of the conventional energy storage inverter is difficult to control in the use process, and the operation of the power grid system is unstable.
Disclosure of Invention
The application provides an automatic output power adjusting method of an energy storage inverter, which comprises the following steps:
acquiring operation parameters of a plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
judging the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters, wherein the operation mode comprises an independent operation mode and a grid-connected operation mode;
when the energy storage inverter is in an independent operation mode, load information connected with the energy storage inverter is obtained;
judging whether the load connected with the energy storage inverter is nonlinear or not according to the load information;
if the load connected with the energy storage inverter is nonlinear, acquiring a first output voltage of the energy storage inverter;
harmonic suppression is carried out on the first output voltage of the energy storage inverter based on a repeated control system, so that a second output voltage is obtained;
the energy storage inverter dynamically adjusts output power according to the second output voltage;
when the energy storage inverter is in a grid-connected operation mode, acquiring three-phase reference voltage of the energy storage inverter, and calculating a first duty ratio according to the three-phase reference voltage;
Correcting the first duty cycle to obtain a corrected duty cycle;
judging whether the corrected duty ratio meets a preset condition or not;
and if so, generating pulse width modulation according to the corrected duty ratio so that the energy storage inverter dynamically adjusts output power according to the pulse width modulation.
Preferably, the step of determining the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters includes:
acquiring a starting signal in an operation parameter, and detecting transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
when the sending port is detected to be an internal controller, acquiring a voltage signal in an operation parameter, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
if the second output voltage of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode;
when the sending port is detected to be a power grid end, acquiring a current signal in an operation parameter, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
And if the output current of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode.
Preferably, the step of obtaining the first output voltage of the energy storage inverter if the load connected to the energy storage inverter is nonlinear includes:
acquiring load current connected with the energy storage inverter;
acquiring a first resistance value of a damping resistor, wherein the damping resistor is connected in series with the output end of the energy storage inverter;
calculating output impedance according to the output voltage, the load current and the first resistance, wherein a calculation formula is as follows:
wherein the said
Representing the output impedance +.>
A first resistance value representing the damping resistance, +.>
Filter capacitance representing the energy storage inverter, < >>
-a filter inductance representing said energy storage inverter, ->
Representing a load current connected to the energy storage inverter;
obtaining output current of the energy storage inverter, and calculating a first output voltage according to the output impedance and the output current, wherein a calculation formula is as follows:
wherein the said
Representing a first output voltage of the energy storage inverter, said +. >
Representing the output impedance, said
Representing the output current of the energy storage inverter.
Preferably, the step of performing harmonic suppression on the first output voltage of the energy storage inverter based on the repetitive control system to obtain a second output voltage includes:
introducing a repetitive control system into the front end of the energy storage inverter, wherein the repetitive control system comprises a closed-loop compensation link, a filter, a switch controller and a zero-phase shift trap, the closed-loop compensation link is connected with one end of the filter in series, the other end of the filter is connected with the energy storage inverter, the switch controller is in a disconnection state, one end of the switch controller is connected with the energy storage inverter, and the other end of the switch controller is connected with the zero-phase shift trap;
obtaining an error convergence condition of a repetitive control system, and enabling the repetitive control system to meet the error convergence condition, wherein the function of the error convergence condition is as follows:
wherein F (z) represents a compensation link in the repetitive control system, Q (z) represents a filter in the repetitive control system, and G (z) represents a closed loop transfer function result in the repetitive control system;
acquiring a current frequency band of a repetitive control system, wherein the current frequency band comprises a low frequency band, an intermediate frequency band and a high frequency band;
When the frequency band of the repetitive control system is in a low-frequency band, acquiring a first output voltage of the energy storage inverter and taking the first output voltage as a second output voltage;
when the frequency band of the repetitive control system is an intermediate frequency band, compensating the phase of the energy storage inverter, acquiring a compensated first output voltage, and taking the compensated first output voltage as a second output voltage;
when the frequency band of the repetitive control system is in a high-frequency band, the switch controller is in a connection state, and performs frequency filtering on the energy storage inverter based on the zero-phase shift trap, and obtains a first output voltage after frequency filtering, and the first output voltage after frequency filtering is used as a second output voltage.
Preferably, the step of obtaining a three-phase reference voltage of the energy storage inverter and calculating a first duty ratio according to the three-phase reference voltage includes:
acquiring a modulation degree of the energy storage inverter;
acquiring battery voltages of the energy storage inverter in a phase a, b phase and c phase;
and calculating three-phase reference voltages according to the modulation degree and the battery voltages of the a phase, the b phase and the c phase, wherein a calculation formula is as follows:
Wherein the said
、/>
、/>
Representing a three-phase reference voltage of the energy storage inverter, the n representing a modulation degree of the energy storage inverter, theVa、Vb、VcRepresenting the battery voltages of the energy storage inverter in a phase, b phase and c phase respectively, wherein ∈>
60 degrees;
calculating a first duty ratio according to the three-phase reference voltage, wherein a calculation formula is as follows:
wherein the saidKa. Kb and Kc respectively representThe first duty ratio of the energy storage inverter in a phase, b phase and c phase, wherein n represents the modulation degree of the energy storage inverter, and the energy storage inverter comprises a power supply circuit and a power supply circuit, wherein the power supply circuit is connected with the power supply circuit and the power supply circuit
60 degrees.
Preferably, the step of correcting the first duty cycle to obtain a corrected duty cycle includes:
acquiring voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases and preset duty ratio adjustment quantity;
calculating a correction duty ratio according to the voltage unbalance coefficient, the duty ratio adjustment quantity and the initial duty ratio, wherein a calculation formula is as follows:
wherein the saidKa1、Kb1、Kc1Respectively representing the corrected duty ratios of the energy storage inverter in a phase, b phase and c phase,
respectively representing the voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases, +.>
Indicating a preset duty cycle adjustment.
The application also provides an output power automatic regulating apparatus of an energy storage inverter, comprising:
the first acquisition module is used for acquiring operation parameters of the plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
the first judging module is used for judging the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters, wherein the operation mode comprises an independent operation mode and a grid-connected operation mode;
the second acquisition module is used for acquiring load information connected with the energy storage inverter when the energy storage inverter is in an independent operation mode;
the second judging module is used for judging whether the load connected with the energy storage inverter is nonlinear according to the load information;
the third acquisition module is used for acquiring the first output voltage of the energy storage inverter if the load connected with the energy storage inverter is nonlinear;
the suppression module is used for performing harmonic suppression on the first output voltage of the energy storage inverter based on the repeated control system to obtain a second output voltage;
the first dynamic adjusting module is used for dynamically adjusting the output power of the energy storage inverter according to the second output voltage;
The fourth acquisition module is used for acquiring three-phase reference voltages of the energy storage inverter when the energy storage inverter is in a grid-connected operation mode, and calculating a first duty ratio according to the three-phase reference voltages;
the correction module is used for correcting the first duty ratio to obtain a corrected duty ratio;
the third judging module is used for judging whether the corrected duty ratio meets a preset condition or not;
and the generation module is used for generating pulse width modulation according to the corrected duty ratio if the pulse width modulation is met, so that the energy storage inverter dynamically adjusts output power according to the pulse width modulation.
Preferably, the first judging module includes:
the first acquisition unit is used for acquiring a starting signal in the operation parameters and detecting the transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
the second acquisition unit is used for acquiring a voltage signal in the operation parameter when the transmission port is detected to be an internal controller, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
the first judging unit is used for judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode if the second output voltage of the energy storage inverter is constant within a preset time period;
The third acquisition unit is used for acquiring a current signal in the operation parameter when the sending port is detected to be a power grid end, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
and the second judging unit is used for judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode if the output current of the energy storage inverter is constant within a preset time period.
The present application also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
The present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
The beneficial effects of this application are: firstly, through obtaining the operation parameters of a plurality of energy storage inverters in an energy storage system, the operation mode of each energy storage inverter can be judged according to the operation parameters, when the energy storage inverters are in an independent operation mode, load information connected with the energy storage inverters is obtained, whether the energy storage inverters are nonlinear or not is judged according to the load information, if the energy storage inverters are nonlinear, a first output voltage of the energy storage inverters is obtained, dynamic harmonic suppression is carried out on the first output voltage based on a repeated control system, so that a second output voltage has a steady-state voltage waveform, the output power of the energy storage inverters can be regulated dynamically and stably, and the stable operation of a power grid system is further enhanced; when the energy storage inverter is in grid-connected operation, three-phase reference voltage of the energy storage inverter is obtained, a first duty ratio is calculated based on the three-phase reference voltage, output power of the energy storage inverter can be adjusted through the first duty ratio, three-phase power of the energy storage inverter is in a proper power output environment, in order to avoid distortion of the three-phase voltage of the energy storage inverter, the first duty ratio can be subjected to linear modulation, namely, the first duty ratio is corrected, whether the corrected duty ratio meets a preset condition is judged, if the preset condition is met, pulse width modulation can be generated according to the corrected duty ratio, so that the energy storage inverter can dynamically adjust the output power according to the pulse width modulation, control is facilitated, and stable operation of a power grid system is further enhanced.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of an apparatus structure according to an embodiment of the present application.
Fig. 3 is a schematic diagram of an internal structure of a computer device according to an embodiment of the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As shown in fig. 1-3, the present application provides a method for automatically adjusting output power of an energy storage inverter, including:
s1, acquiring operation parameters of a plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
s2, judging an operation mode of each energy storage inverter according to operation parameters of the plurality of energy storage inverters, wherein the operation mode comprises an independent operation mode and a grid-connected operation mode;
s3, when the energy storage inverter is in an independent operation mode, load information connected with the energy storage inverter is obtained;
s4, judging whether the load connected with the energy storage inverter is nonlinear or not according to the load information;
s5, if the load connected with the energy storage inverter is nonlinear, acquiring a first output voltage of the energy storage inverter;
S6, harmonic suppression is carried out on the first output voltage of the energy storage inverter based on the repeated control system, and a second output voltage is obtained;
s7, dynamically adjusting output power of the energy storage inverter according to the second output voltage;
s8, when the energy storage inverter is in a grid-connected operation mode, acquiring three-phase reference voltage of the energy storage inverter, and calculating a first duty ratio according to the three-phase reference voltage;
s9, correcting the first duty ratio to obtain a corrected duty ratio;
s10, judging whether the corrected duty ratio meets a preset condition or not;
and S11, if the output power is met, generating pulse width modulation according to the corrected duty ratio, so that the energy storage inverter dynamically adjusts the output power according to the pulse width modulation.
As described in the above steps S1-S11, the energy storage system is an important ring in the power production process, so that the power equipment can be effectively utilized, the power supply cost is reduced, the energy storage system is an important energy storage inverter, the energy storage inverter can convert the ac power of the mains supply into the dc power to charge and store the dc power into a storage battery (storage battery), and when the power of the mains supply fails, the dc power stored by the storage battery is changed into 220V ac power of the mains supply for the household appliances; because the operation modes of the energy storage inverters are very many, including but not limited to a grid-connected operation mode, an island operation mode, a hybrid system mode, an independent operation mode and the like, in one energy storage system, only one energy storage inverter is often used, and in different operation modes, the operation parameters such as the output grid frequency, power, current, voltage and the like of the energy storage inverters are inconsistent, the method comprises the steps of firstly acquiring the operation parameters of a plurality of (at least two) energy storage inverters in the energy storage system, judging the operation mode of each energy storage inverter according to the operation parameters, when the energy storage inverters are in the independent operation mode, because the energy storage inverters have resonance peaks, in the practical application process, the load current of the energy storage inverters is diversified, and when the load is nonlinear, harmonic voltage drop can be generated by the output impedance of the energy storage inverters, so that a large amount of medium-low frequency harmonic can exist in the output voltage of the energy storage inverters, and the harmonic voltage is difficult to eliminate; when the energy storage inverter is in grid-connected operation, namely a plurality of energy storage inverters are in parallel operation, for example, the energy storage inverter adopts an H-bridge topological structure, at the moment, the energy storage inverter is easy to have the condition of unbalanced three-phase direct-current link voltage, and unbalanced inter-phase voltage can lead to unbalanced three-phase power, so that the three-phase output power of the three-phase direct-current link voltage is difficult to effectively control.
In one embodiment, the step S2 of determining the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters includes:
s21, acquiring a starting signal in an operation parameter, and detecting transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
s22, when the sending port is detected to be an internal controller, acquiring a voltage signal in the operation parameter, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
s23, if the second output voltage of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode;
s24, when the sending port is detected to be a power grid end, acquiring a current signal in an operation parameter, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
and S25, if the output current of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode.
As described in the above steps S21-S25, since the energy storage system is usually operated by a plurality of energy storage inverters together, and the energy storage system switches the operation modes when it is scheduled to operate, in order to conveniently and quickly understand the operation mode of each energy storage inverter, the transmitting information of the transmitting port of each energy storage inverter may be obtained, and the operation mode of each energy storage inverter may be determined according to the transmitted port information, when the energy storage system is connected to the internal controller, in order to confirm that the energy storage system has no fault, the voltage signal in the operation parameter may be obtained, if the output second output voltage is constant, the energy storage system is determined to be in the independent operation mode and to operate normally, when the energy storage system is connected to the power grid, in order to confirm that the energy storage system has no fault, the current signal in the operation parameter may be obtained, and if the output current is constant, the energy storage system is determined to be in the grid-connected operation mode and to operate normally.
In one embodiment, the step S5 of obtaining the first output voltage of the energy storage inverter if the load connected to the energy storage inverter is nonlinear includes:
s51, obtaining load current connected with the energy storage inverter;
s52, obtaining a first resistance value of a damping resistor, wherein the damping resistor is connected in series with the output end of the energy storage inverter;
S53, calculating output impedance according to the output voltage, the load current and the first resistance value, wherein a calculation formula is as follows:
wherein the said
Representing the output impedance +.>
A first resistance value representing the damping resistance, +.>
Filter capacitance representing the energy storage inverter, < >>
-a filter inductance representing said energy storage inverter, ->
Representing a load current connected to the energy storage inverter;
s54, obtaining output current of the energy storage inverter, and calculating a first output voltage according to the output impedance and the output current, wherein a calculation formula is as follows:
wherein the said
Representing a first output voltage of the energy storage inverter, said +.>
Representing the output impedance, said
Representing the output current of the energy storage inverter.
As described in the above steps S51-S54, since the energy storage inverter has a resonance peak, the energy storage inverter can be suppressed by adopting a damping method, that is, a damping resistor can be connected in series with the output end of the energy storage inverter, and an output impedance is calculated, and then a first output voltage of the energy storage inverter is calculated according to the output impedance and the output current, so that the obtained first output voltage is prevented from being affected by the resonance peak, and the calculation result is more accurate.
In one embodiment, the step S6 of performing harmonic suppression on the first output voltage of the energy storage inverter based on the repetitive control system to obtain a second output voltage includes:
s61, introducing a repetitive control system into the front end of the energy storage inverter, wherein the repetitive control system comprises a closed-loop compensation link, a filter, a switch controller and a zero-phase shift trap, the closed-loop compensation link is connected with one end of the filter in series, the other end of the filter is connected with the energy storage inverter, the switch controller is in a disconnection state, one end of the switch controller is connected with the energy storage inverter, and the other end of the switch controller is connected with the zero-phase shift trap;
s62, acquiring an error convergence condition of a repetitive control system, and enabling the repetitive control system to meet the error convergence condition, wherein the function of the error convergence condition is as follows:
wherein F (z) represents a compensation link in the repetitive control system, Q (z) represents a filter in the repetitive control system, and G (z) represents a closed loop transfer function result in the repetitive control system;
s63, acquiring a current frequency band of the repetitive control system, wherein the current frequency band comprises a low frequency band, an intermediate frequency band and a high frequency band;
S64, when the frequency band of the repetitive control system is in a low-frequency band, acquiring a first output voltage of the energy storage inverter, and taking the first output voltage as a second output voltage;
s65, when the frequency band of the repetitive control system is an intermediate frequency band, compensating the phase of the energy storage inverter, acquiring a compensated first output voltage, and taking the compensated first output voltage as a second output voltage;
and S66, when the frequency band of the repetitive control system is in a high-frequency band, the switch controller is in a connection state, frequency filtering is carried out on the energy storage inverter based on the zero-phase shift wave trap, a first output voltage after frequency filtering is obtained, and the first output voltage after frequency filtering is used as a second output voltage.
As described in the above steps S61-S66, all periodic signals may be generated by a positive feedback system, and when the periodic signals disappear, the system may still generate the same repetitive control signal, based on this principle, the embodiment introduces a repetitive control system at the front end of the energy storage inverter, and the filter in the repetitive control system may ensure that the output of the repetitive control link is stable, by setting the repetitive control system and making it meet the error convergence condition, so that the repetitive control system may be ensured to have no static error tracking capability in the low frequency region, and the repetitive control system may have better stability, and when the frequency band of the repetitive control system is in the low frequency band, the first output voltage of the energy storage inverter may be directly obtained without compensation, and may be used as the second output voltage; when the frequency band of the repetitive control system is an intermediate frequency band, the phase of the energy storage inverter can be compensated, for example, the phase compensation is performed by adopting an advanced link, the resonant frequency can be effectively attenuated, the compensated first output voltage is obtained, and the compensated first output voltage is used as the second output voltage; when the frequency band of the repetitive control system is in a high-frequency band, the controllable switch controller is in a connection state, and performs frequency filtering on the energy storage inverter based on the zero-phase shift wave trap, and obtains a first output voltage after frequency filtering, and the first output voltage after frequency filtering is used as a second output voltage, so that dynamic harmonic suppression can be performed on the first output voltage based on the repetitive control system, the second output voltage has a steady voltage waveform, so that the output power of the energy storage inverter can be dynamically regulated stably, and the stable operation of a power grid system is further enhanced;
In one embodiment, the step S8 of obtaining the three-phase reference voltage of the energy storage inverter and calculating the first duty ratio according to the three-phase reference voltage includes:
s81, acquiring a modulation degree of the energy storage inverter;
s82, obtaining battery voltages of the energy storage inverter in a phase a, b phase and c phase;
s83, calculating three-phase reference voltages according to the modulation degree and the battery voltages of the a phase, the b phase and the c phase, wherein a calculation formula is as follows:
wherein the said
、/>
、/>
Representing a three-phase reference voltage of the energy storage inverter, the n representing a modulation degree of the energy storage inverter,the saidVa、Vb、VcRepresenting the battery voltages of the energy storage inverter in a phase, b phase and c phase respectively, wherein ∈>
60 degrees;
s84, calculating a first duty ratio according to the three-phase reference voltage, wherein a calculation formula is as follows:
wherein the saidKa. Kb and Kc respectively representThe first duty ratio of the energy storage inverter in a phase, b phase and c phase, wherein n represents the modulation degree of the energy storage inverter, and the energy storage inverter comprises a power supply circuit and a power supply circuit, wherein the power supply circuit is connected with the power supply circuit and the power supply circuit
60 degrees.
As described in the above steps S81-S84, since the battery voltage of each energy storage inverter is inconsistent, the modulation degree of the energy storage inverter can be obtained first, then the three-phase reference voltage can be calculated according to the modulation degree and the three-phase battery voltage, and the first duty ratio is calculated based on the three-phase reference voltage, so that the output power of each energy storage inverter can be adjusted according to the first duty ratio, so that each phase of the energy storage inverter is in a more suitable power output environment.
In one embodiment, the step S9 of correcting the first duty cycle to obtain a corrected duty cycle includes:
s91, acquiring voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases and preset duty ratio adjustment quantity;
s92, calculating a correction duty ratio according to the voltage unbalance coefficient, the duty ratio adjustment quantity and the initial duty ratio, wherein a calculation formula is as follows:
wherein the saidKa1、Kb1、Kc1Respectively representing the corrected duty ratios of the energy storage inverter in a phase, b phase and c phase,
respectively representing the voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases, +.>
Indicating a preset duty cycle adjustment.
As described in the above steps S91-S92, since each energy storage inverter has an independent dc source, there is a difference in voltage between the energy storage inverters, in order to avoid distortion of the three-phase voltage of the energy storage inverter, the first duty cycle may be linearly modulated, a voltage imbalance coefficient between the three-phase phases may be obtained, and the first duty cycle may be corrected based on the voltage imbalance coefficient, so that the obtained corrected duty cycle can maximally equalize the voltages between the three-phase phases, thereby equalizing the three-phase output power, and further enabling the energy storage inverter to stably operate in the grid-connected operation mode.
The application also provides an output power automatic regulating apparatus of an energy storage inverter, comprising:
the first acquisition module 1 is used for acquiring operation parameters of a plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
a first judging module 2, configured to judge an operation mode of each energy storage inverter according to operation parameters of the plurality of energy storage inverters, where the operation mode includes an independent operation mode and a grid-connected operation mode;
the second acquisition module 3 is used for acquiring load information connected with the energy storage inverter when the energy storage inverter is in an independent operation mode;
the second judging module 4 is used for judging whether the load connected with the energy storage inverter is nonlinear according to the load information;
a third obtaining module 5, configured to obtain a first output voltage of the energy storage inverter if the load connected to the energy storage inverter is nonlinear;
the suppression module 6 is used for performing harmonic suppression on the first output voltage of the energy storage inverter based on the repeated control system to obtain a second output voltage;
a first dynamic adjustment module 7, configured to dynamically adjust output power of the energy storage inverter according to the second output voltage;
A fourth obtaining module 8, configured to obtain a three-phase reference voltage of the energy storage inverter when the energy storage inverter is in a grid-connected operation mode, and calculate a first duty ratio according to the three-phase reference voltage;
the correction module 9 is configured to correct the first duty cycle to obtain a corrected duty cycle;
a third judging module 10, configured to judge whether the corrected duty cycle meets a preset condition;
and the generating module 11 is used for generating pulse width modulation according to the corrected duty ratio if the pulse width modulation is met, so that the energy storage inverter dynamically adjusts the output power according to the pulse width modulation.
In one embodiment, the first determining module 2 includes:
the first acquisition unit is used for acquiring a starting signal in the operation parameters and detecting the transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
the second acquisition unit is used for acquiring a voltage signal in the operation parameter when the transmission port is detected to be an internal controller, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
The first judging unit is used for judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode if the second output voltage of the energy storage inverter is constant within a preset time period;
the third acquisition unit is used for acquiring a current signal in the operation parameter when the sending port is detected to be a power grid end, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
and the second judging unit is used for judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode if the output current of the energy storage inverter is constant within a preset time period.
In one embodiment, the third obtaining module 5 includes:
a fourth obtaining unit, configured to obtain a load current connected to the energy storage inverter;
a fifth obtaining unit, configured to obtain a first resistance value of a damping resistor, where the damping resistor is connected in series to an output end of the energy storage inverter;
the first calculating unit is configured to calculate an output impedance according to the output voltage, the load current and the first resistance value, where a calculation formula is:
wherein the said 
Representing the output impedance +.>
A first resistance value representing the damping resistance, +.>
Representation ofFilter capacitor of the energy storage inverter, +.>
-a filter inductance representing said energy storage inverter, ->
Representing a load current connected to the energy storage inverter;
a sixth obtaining unit, configured to obtain an output current of the energy storage inverter, and calculate a first output voltage according to the output impedance and the output current, where a calculation formula is:
wherein the said
Representing a first output voltage of the energy storage inverter, said +.>
Representing the output impedance, said
Representing the output current of the energy storage inverter.
In one embodiment, the suppression module 6 comprises:
the device comprises an introduction unit, a switching controller and a zero-phase shift trap, wherein the introduction unit is used for introducing a repetitive control system at the front end of the energy storage inverter, the repetitive control system comprises a closed-loop compensation link, a filter, the switching controller and the zero-phase shift trap, the closed-loop compensation link is connected with one end of the filter in series, the other end of the filter is connected with the energy storage inverter, the switching controller is in a disconnection state, one end of the switching controller is connected with the energy storage inverter, and the other end of the switching controller is connected with the zero-phase shift trap;
A seventh obtaining unit, configured to obtain an error convergence condition of a repetitive control system, and make the repetitive control system meet the error convergence condition, where a function of the error convergence condition is:
wherein F (z) represents a compensation link in the repetitive control system, Q (z) represents a filter in the repetitive control system, and G (z) represents a closed loop transfer function result in the repetitive control system;
an eighth obtaining unit, configured to obtain a current frequency band of the repetitive control system, where the current frequency band includes a low frequency band, an intermediate frequency band, and a high frequency band;
a ninth obtaining unit, configured to obtain, when the frequency band of the repetitive control system is a low frequency band, a first output voltage of the energy storage inverter, and use the first output voltage as a second output voltage;
the phase compensation unit is used for compensating the phase of the energy storage inverter when the frequency band of the repetitive control system is an intermediate frequency band, acquiring a compensated first output voltage and taking the compensated first output voltage as a second output voltage;
and the frequency filtering unit is used for filtering the frequency of the energy storage inverter based on the zero phase shift trap when the frequency band of the repetitive control system is in a high frequency band, and acquiring a first output voltage after frequency filtering, wherein the first output voltage after frequency filtering is used as a second output voltage.
In one embodiment, the fourth obtaining module 8 includes:
a tenth acquisition unit configured to acquire a modulation degree of the energy storage inverter;
an eleventh acquisition unit for acquiring battery voltages of the energy storage inverter in a phase, b phase and c phase;
and a second calculation unit for calculating three-phase reference voltages according to the modulation degree and the battery voltages of the a phase, the b phase and the c phase, wherein the calculation formula is as follows:
wherein the said
、/>
、/>
Representing a three-phase reference voltage of the energy storage inverter, the n representing a modulation degree of the energy storage inverter, theVa、Vb、VcRepresenting the battery voltages of the energy storage inverter in a phase, b phase and c phase respectively, wherein ∈>
60 degrees;
a third calculation unit, configured to calculate a first duty ratio according to the three-phase reference voltage, where a calculation formula is:
wherein the saidKa. Kb and Kc respectively representThe first duty ratio of the energy storage inverter in a phase, b phase and c phase, wherein n represents the modulation degree of the energy storage inverter, and the energy storage inverter comprises a power supply circuit and a power supply circuit, wherein the power supply circuit is connected with the power supply circuit and the power supply circuit
60 degrees.
In one embodiment, the correction module 9 includes:
a twelfth acquisition unit, configured to acquire a voltage imbalance coefficient of the energy storage inverter between a phase, b phase and c phase phases, and a preset duty cycle adjustment amount;
A fourth calculation unit, configured to calculate a correction duty cycle according to the voltage unbalance coefficient, the duty cycle adjustment amount, and the initial duty cycle, where a calculation formula is:
wherein the saidKa1、Kb1、Kc1Respectively representing the corrected duty ratios of the energy storage inverter in a phase, b phase and c phase,
respectively representing the voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases, +.>
Indicating a preset duty cycle adjustment.
The above modules and units are used for correspondingly executing each step in the automatic output power adjusting method of the energy storage inverter, and specific implementation manners thereof are described with reference to the above method embodiments and are not described herein again.
As shown in fig. 3, the present application further provides a computer device, which may be a server, and the internal structure of which may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the computer is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used for storing all data required by the process of the automatic output power adjustment method of the energy storage inverter. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method for automatically adjusting the output power of an energy storage inverter.
Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of a portion of the architecture in connection with the present application and is not intended to limit the computer device to which the present application is applied.
An embodiment of the present application further provides a computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements the method for automatically adjusting the output power of any one of the energy storage inverters.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by hardware associated with a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided herein and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method 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, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (9)
1. An automatic output power adjusting method of an energy storage inverter is characterized by comprising the following steps:
acquiring operation parameters of a plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
Judging the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters, wherein the operation mode comprises an independent operation mode and a grid-connected operation mode;
when the energy storage inverter is in an independent operation mode, load information connected with the energy storage inverter is obtained;
judging whether the load connected with the energy storage inverter is nonlinear or not according to the load information;
if the load connected with the energy storage inverter is nonlinear, acquiring a first output voltage of the energy storage inverter;
harmonic suppression is carried out on the first output voltage of the energy storage inverter based on a repeated control system, so that a second output voltage is obtained;
the energy storage inverter dynamically adjusts output power according to the second output voltage;
when the energy storage inverter is in a grid-connected operation mode, acquiring three-phase reference voltage of the energy storage inverter, and calculating a first duty ratio according to the three-phase reference voltage;
correcting the first duty cycle to obtain a corrected duty cycle;
judging whether the corrected duty ratio meets a preset condition or not;
if yes, generating pulse width modulation according to the corrected duty ratio so that the energy storage inverter dynamically adjusts output power according to the pulse width modulation; the step of performing harmonic suppression on the first output voltage of the energy storage inverter based on the repetitive control system to obtain a second output voltage comprises the following steps:
Introducing a repetitive control system into the front end of the energy storage inverter, wherein the repetitive control system comprises a closed-loop compensation link, a filter, a switch controller and a zero-phase shift trap, the closed-loop compensation link is connected with one end of the filter in series, the other end of the filter is connected with the energy storage inverter, the switch controller is in a disconnection state, one end of the switch controller is connected with the energy storage inverter, and the other end of the switch controller is connected with the zero-phase shift trap;
obtaining an error convergence condition of a repetitive control system, and enabling the repetitive control system to meet the error convergence condition, wherein the function of the error convergence condition is as follows:
wherein F (z) represents a compensation link in the repetitive control system, Q (z) represents a filter in the repetitive control system, and G (z) represents a closed loop transfer function result in the repetitive control system;
acquiring a current frequency band of a repetitive control system, wherein the current frequency band comprises a low frequency band, an intermediate frequency band and a high frequency band;
when the frequency band of the repetitive control system is in a low-frequency band, acquiring a first output voltage of the energy storage inverter and taking the first output voltage as a second output voltage;
when the frequency band of the repetitive control system is an intermediate frequency band, compensating the phase of the energy storage inverter, acquiring a compensated first output voltage, and taking the compensated first output voltage as a second output voltage;
When the frequency band of the repetitive control system is in a high-frequency band, the switch controller is in a connection state, and performs frequency filtering on the energy storage inverter based on the zero-phase shift trap, and obtains a first output voltage after frequency filtering, and the first output voltage after frequency filtering is used as a second output voltage.
2. The method of claim 1, wherein the step of determining the operation mode of each energy storage inverter based on the operation parameters of the plurality of energy storage inverters comprises:
acquiring a starting signal in an operation parameter, and detecting transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
when the sending port is detected to be an internal controller, acquiring a voltage signal in an operation parameter, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
if the second output voltage of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode;
When the sending port is detected to be a power grid end, acquiring a current signal in an operation parameter, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
and if the output current of the energy storage inverter is constant within a preset time period, judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode.
3. The method of claim 1, wherein the step of obtaining the first output voltage of the energy storage inverter if the load connected to the energy storage inverter is nonlinear comprises:
acquiring load current connected with the energy storage inverter;
acquiring a first resistance value of a damping resistor, wherein the damping resistor is connected in series with the output end of the energy storage inverter;
calculating output impedance according to the output voltage, the load current and the first resistance, wherein a calculation formula is as follows:
wherein the said
Representing the output impedance +.>
A first resistance value representing a damping resistance, representing said +.>
Filter capacitor of energy storage inverter->
-a filter inductance representing said energy storage inverter, - >
Representing a load current connected to the energy storage inverter;
obtaining output current of the energy storage inverter, and calculating a first output voltage according to the output impedance and the output current, wherein a calculation formula is as follows:
wherein the said
Representing a first output voltage of the energy storage inverter, said +.>
Representing the output impedance, said->
Representing the output current of the energy storage inverter.
4. The method of claim 1, wherein the step of obtaining a three-phase reference voltage of the energy storage inverter and calculating a first duty cycle from the three-phase reference voltage comprises:
acquiring a modulation degree of the energy storage inverter;
acquiring battery voltages of the energy storage inverter in a phase a, b phase and c phase;
and calculating three-phase reference voltages according to the modulation degree and the battery voltages of the a phase, the b phase and the c phase, wherein a calculation formula is as follows:
wherein the said
、/>
、/>
Representing a three-phase reference voltage of the energy storage inverter, the n representing a modulation degree of the energy storage inverter, theVa、Vb、VcRepresenting the battery voltages of the energy storage inverter in a phase, b phase and c phase respectively, wherein ∈>
60 degrees;
Calculating a first duty ratio according to the three-phase reference voltage, wherein a calculation formula is as follows:
wherein the saidKa. Kb and Kc respectively representThe first duty ratio of the energy storage inverter in a phase, b phase and c phase, wherein n represents the modulation degree of the energy storage inverter, and the energy storage inverter comprises a power supply circuit and a power supply circuit, wherein the power supply circuit is connected with the power supply circuit and the power supply circuit
60 degrees.
5. The method of claim 1, wherein the step of correcting the first duty cycle to obtain a corrected duty cycle comprises:
acquiring voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases and preset duty ratio adjustment quantity;
calculating a correction duty ratio according to the voltage unbalance coefficient, the duty ratio adjustment quantity and the initial duty ratio, wherein a calculation formula is as follows:
wherein the saidKa1、Kb1、Kc1Respectively representing the corrected duty ratios of the energy storage inverter in the a phase, the b phase and the c phase, respectively representing the first duty ratios of the energy storage inverter in the a phase, the b phase and the c phase,
respectively representing the voltage unbalance coefficients of the energy storage inverter among a phase, b phase and c phase three phases, +.>
Indicating a preset duty cycle adjustment.
6. An automatic output power adjusting device of an energy storage inverter, comprising:
The first acquisition module is used for acquiring operation parameters of the plurality of energy storage inverters, wherein the operation parameters comprise a current signal, a voltage signal and a starting signal;
the first judging module is used for judging the operation mode of each energy storage inverter according to the operation parameters of the plurality of energy storage inverters, wherein the operation mode comprises an independent operation mode and a grid-connected operation mode;
the second acquisition module is used for acquiring load information connected with the energy storage inverter when the energy storage inverter is in an independent operation mode;
the second judging module is used for judging whether the load connected with the energy storage inverter is nonlinear according to the load information;
the third acquisition module is used for acquiring the first output voltage of the energy storage inverter if the load connected with the energy storage inverter is nonlinear;
the suppression module is used for performing harmonic suppression on the first output voltage of the energy storage inverter based on the repeated control system to obtain a second output voltage;
the first dynamic adjusting module is used for dynamically adjusting the output power of the energy storage inverter according to the second output voltage;
the fourth acquisition module is used for acquiring three-phase reference voltages of the energy storage inverter when the energy storage inverter is in a grid-connected operation mode, and calculating a first duty ratio according to the three-phase reference voltages;
The correction module is used for correcting the first duty ratio to obtain a corrected duty ratio;
the third judging module is used for judging whether the corrected duty ratio meets a preset condition or not;
the generation module is used for generating pulse width modulation according to the corrected duty ratio if the pulse width modulation is met, so that the energy storage inverter dynamically adjusts output power according to the pulse width modulation;
wherein, the suppression module includes:
the device comprises an introduction unit, a switching controller and a zero-phase shift trap, wherein the introduction unit is used for introducing a repetitive control system at the front end of the energy storage inverter, the repetitive control system comprises a closed-loop compensation link, a filter, the switching controller and the zero-phase shift trap, the closed-loop compensation link is connected with one end of the filter in series, the other end of the filter is connected with the energy storage inverter, the switching controller is in a disconnection state, one end of the switching controller is connected with the energy storage inverter, and the other end of the switching controller is connected with the zero-phase shift trap;
a seventh obtaining unit, configured to obtain an error convergence condition of a repetitive control system, and make the repetitive control system meet the error convergence condition, where a function of the error convergence condition is:
wherein F (z) represents a compensation link in the repetitive control system, Q (z) represents a filter in the repetitive control system, and G (z) represents a closed loop transfer function result in the repetitive control system;
An eighth obtaining unit, configured to obtain a current frequency band of the repetitive control system, where the current frequency band includes a low frequency band, an intermediate frequency band, and a high frequency band;
a ninth obtaining unit, configured to obtain, when the frequency band of the repetitive control system is a low frequency band, a first output voltage of the energy storage inverter, and use the first output voltage as a second output voltage;
the phase compensation unit is used for compensating the phase of the energy storage inverter when the frequency band of the repetitive control system is an intermediate frequency band, acquiring a compensated first output voltage and taking the compensated first output voltage as a second output voltage;
and the frequency filtering unit is used for filtering the frequency of the energy storage inverter based on the zero phase shift trap when the frequency band of the repetitive control system is in a high frequency band, and acquiring a first output voltage after frequency filtering, wherein the first output voltage after frequency filtering is used as a second output voltage.
7. The automatic power regulator of claim 6, wherein the first determining module comprises:
The first acquisition unit is used for acquiring a starting signal in the operation parameters and detecting the transmission information of a transmission port according to the starting signal, wherein the transmission port comprises an internal controller end and a power grid end;
the second acquisition unit is used for acquiring a voltage signal in the operation parameter when the transmission port is detected to be an internal controller, and judging whether the second output voltage of the energy storage inverter is constant in a first preset time period according to the voltage signal;
the first judging unit is used for judging that the energy storage inverter corresponding to the second output voltage is in an independent operation mode if the second output voltage of the energy storage inverter is constant within a preset time period;
the third acquisition unit is used for acquiring a current signal in the operation parameter when the sending port is detected to be a power grid end, and judging whether the output current of the energy storage inverter is constant in a second preset time period according to the current signal;
and the second judging unit is used for judging that the energy storage inverter corresponding to the output current is in a grid-connected operation mode if the output current of the energy storage inverter is constant within a preset time period.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
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