CN114499133A - Method for eliminating primary current harmonic of MMC type DC-DC converter - Google Patents
Method for eliminating primary current harmonic of MMC type DC-DC converter Download PDFInfo
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- CN114499133A CN114499133A CN202210327815.5A CN202210327815A CN114499133A CN 114499133 A CN114499133 A CN 114499133A CN 202210327815 A CN202210327815 A CN 202210327815A CN 114499133 A CN114499133 A CN 114499133A
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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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/02—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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
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Abstract
The invention provides a method for eliminating primary current harmonic of an MMC type DC-DC converter, which defines the primary current harmonic of the high-voltage side of the MMC type DC-DC converter by analyzing the basic operation mechanism of the MMC type DC-DC converter and acquires the amplitude of the primary current harmonic; and then, taking the primary current harmonic amplitude of the MMC type DC-DC converter as a target function, changing the carrier phase shift angle combination of each submodule and carrying out continuous iterative calculation, and comparing the primary current ripple sizes of the converters under different phase shift angles to select the optimal phase shift angle combination, thereby achieving the purpose of reducing the current harmonic of the high-voltage side. The problem of in the energy storage application occasion of high pressure, large capacity, DC-DC converter based on MMC is used for the direct current ripple increase of high-pressure side when energy storage system inserts direct current electric wire netting is solved.
Description
Technical Field
The invention belongs to the technical field of intelligent power grid energy storage systems, and particularly relates to a method for eliminating primary current harmonic waves of an MMC type DC-DC converter.
Background
In a direct-current power distribution and utilization system, the reasonable configuration of the energy storage system can effectively smooth the output of the renewable energy system, and achieves a certain peak clipping and valley filling effect. In the application occasions of high-voltage and large-capacity energy storage, due to the limitation of voltage balance, the energy storage system is difficult to adopt a large number of monomers or assemblies to be connected in series. To solve this problem, additional equalization circuits are often required in the converter to implement voltage equalization control, however this further increases the cost of the system and the complexity of control. For the energy storage conversion scheme adopting the H-bridge cascade converter as the AC power grid, the DC-DC converter based on the MMC can be used for the energy storage system to be connected into the DC power grid so as to reduce the voltage level of each energy storage module.
The DC-DC converter based on the MMC has remarkable advantages when being used in high-voltage and high-power energy storage occasions, and has the characteristics that the voltage and current stress of a switching device is small, and the required inductance under the condition of the same output current ripple is only 1/N2(N is the number of cascaded modules) of a single half-bridge topology; however, since the state of charge (SOC) of each energy storage battery is difficult to maintain balanced all the time, the corresponding duty ratios of the submodules are not consistent, which further causes the dc ripple of the submodules on the high voltage side to increase.
Disclosure of Invention
In view of this, the present invention is directed to solve the problem that a DC-DC converter based on an MMC increases a DC ripple on a high-voltage side when an energy storage system is connected to a DC power grid in an energy storage application with high voltage and large capacity.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a method for eliminating primary current harmonic waves of an MMC type DC-DC converter, which comprises the following steps:
the method comprises the following steps of defining a primary current harmonic vector of the MMC type DC-DC converter by utilizing the duty ratio of each submodule, wherein the definition formula of the primary current harmonic vector is as follows:
in the formula (I), the compound is shown in the specification,representing the vector of the harmonics of the primary current,representing the phase shift angle combination of N sub-modules,the number of sub-modules is indicated,is shown asThe harmonic coefficients of the primary currents of the sub-modules,indicates to beThe harmonic coefficient of the primary current of the sub-module is taken asThe reference phase shift angle of the individual sub-modules,in whichIs shown asThe dc side voltage on the low side of the sub-module,is shown asThe duty cycle of the sub-module;
iteratively calculating the amplitude of the primary current harmonic vector under different phase shift angle combinations until a set condition is met;
and executing the phase shift angle combination meeting the set condition as the reference phase shift angle combination of the next control period.
in the formula (I), the compound is shown in the specification,is shown asThe dc side voltage on the high side of the sub-module,is shown asThe transmission power of the sub-modules is,representing the total transmission power of the N sub-modules.
Further, iteratively calculating the amplitudes of the first current harmonic vectors under different phase shift angle combinations until the set conditions are met specifically includes:
definitional setting objective function based on primary current harmonic vector,WhereinRepresenting the first current harmonic when the phase shift angle of the first submodule is set to the reference phase shift angleThe wave vector, for the same reason,representing a primary current harmonic vector when the phase shift angle of the Nth sub-module is set as a reference phase shift angle;
and (4) iteratively calculating the objective function value under different phase shift angle combinations until the objective function value is not greater than the set maximum error limit, so that the amplitude of the primary current harmonic vector meets the set condition.
Further, the maximum error limit is specifically set as:
Further, iteratively calculating the amplitudes of the first current harmonic vectors under different phase shift angle combinations until the set conditions are met specifically includes:
setting a unit stepping phase shift angle and iteration cycle time;
calculating the amplitude of a primary current harmonic vector under the current phase shift angle combination by using the unit stepping phase shift angle;
and judging whether the amplitude of the primary current harmonic vector under the current phase shift angle combination meets a set condition within the iteration cycle time, if not, continuously updating the phase shift angle combination, iteratively calculating the amplitude of the corresponding primary current harmonic vector until the set condition is met, and taking the phase shift angle combination meeting the set condition as a reference phase shift angle combination so as to carry out subsequent steps.
Further, calculating the amplitude of the first current harmonic vector under the current phase shift angle combination by using the unit step phase shift angle specifically comprises:
calculating the first current harmonic error of the phase shift angle combination in two iteration directions when the unit stepping phase shift angle is increased or decreased;
and judging the magnitude of the primary current harmonic error in the two iteration directions, and selecting the iteration direction with the smaller primary current harmonic error for calculation in the next iteration calculation.
Further, the first current harmonic error in two iteration directions is specifically:
in the formula (I), the compound is shown in the specification,representing the first current harmonic error of the phase shift angle combination at increasing unit step phase shift angle,representing the first current harmonic error of the phase shift angle combination in reducing the unit step phase shift angle,representing the unit step phase shift angle.
In summary, the invention provides a method for eliminating a primary current harmonic of an MMC type DC-DC converter, which defines a primary current harmonic of a high-voltage side of the MMC type DC-DC converter by analyzing a basic operation mechanism of the MMC type DC-DC converter and obtains an amplitude of the primary current harmonic; and then, taking the primary current harmonic amplitude of the MMC type DC-DC converter as a target function, changing the carrier phase shift angle combination of each submodule and carrying out continuous iterative calculation, and comparing the primary current ripple sizes of the converters under different phase shift angles to select the optimal phase shift angle combination, thereby achieving the purpose of reducing the current harmonic of the high-voltage side. The problem of in the energy storage application occasion of high pressure, large capacity, DC-DC converter based on MMC is used for the direct current ripple increase of high-pressure side when energy storage system inserts direct current electric wire netting is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic flowchart of a method for eliminating a primary current harmonic of an MMC DC-DC converter according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of iterative computation in a primary current harmonic cancellation method of an MMC DC-DC converter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in 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 embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a direct-current power distribution and utilization system, the reasonable configuration of the energy storage system can effectively smooth the output of the renewable energy system, and achieves a certain peak clipping and valley filling effect. In the application occasions of high-voltage and large-capacity energy storage, due to the limitation of voltage balance, the energy storage system is difficult to adopt a large number of monomers or assemblies to be connected in series. To solve this problem, additional equalization circuits are often required in the converter to implement voltage equalization control, however this further increases the cost of the system and the complexity of control. For the energy storage conversion scheme adopting the H-bridge cascade converter as the AC power grid, the DC-DC converter based on the MMC can be used for the energy storage system to be connected into the DC power grid so as to reduce the voltage level of each energy storage module.
The DC-DC converter based on the MMC has remarkable advantages when being used in high-voltage and high-power energy storage occasions, and has the characteristics that the voltage and current stress of a switching device is small, and the required inductance under the condition of the same output current ripple is only 1/N2(N is the number of cascaded modules) of a single half-bridge topology; however, since the state of charge (SOC) of each energy storage battery is difficult to maintain balanced all the time, the corresponding duty ratios of the submodules are not consistent, which further causes the dc ripple of the submodules on the high voltage side to increase.
Based on the method, the invention provides a method for eliminating the primary current harmonic of the MMC type DC-DC converter.
The following is a detailed description of an embodiment of a method for eliminating a first harmonic of a current of an MMC DC-DC converter according to the present invention.
Referring to fig. 1 and fig. 2, the present embodiment provides a method for eliminating a first harmonic of a current of an MMC DC-DC converter, including the following steps:
s100: and defining a primary current harmonic vector of the MMC type DC-DC converter by utilizing the duty ratio of each submodule.
Analyzing the basic operation mechanism of the MMC type DC-DC converter can know that the inconsistency of the duty ratios corresponding to the submodules directly causes the direct current ripple on the high-voltage side to be increased. In order to reduce the direct current ripple on the high-voltage side, the embodiment of the application defines the primary current harmonic vector of the converter according to the duty ratio of the sub-module, and establishes the relationship between the duty ratio of the sub-module and the direct current ripple on the high-voltage side, so that the phase shift angle combination of the sub-module when the direct current ripple on the high-voltage side is minimum can be conveniently obtained.
The acquisition of data and the initialization phase are first required before the primary current harmonic vector is defined and calculated. Specifically, data acquisition includes simultaneously acquiring the transmission power of each sub-moduleDirect current side voltage of low voltage sideAnd a DC side voltage of the high voltage side(ii) a The initialization parameters include unit step phase shift angleUpdate cycle timeAnd maximum error limitAnd setting the initialization phase shift angle of each sub-module。
According to the collected transmission power of each sub-moduleDirect current side voltage of low voltage sideAnd a DC side voltage of the high voltage sideTo calculate the duty ratio corresponding to each sub-module. The calculation formula of the duty ratio is specifically expressed as:
in the formula (I), the compound is shown in the specification,is shown asThe dc side voltage on the high side of the sub-module,is shown asThe transmission power of the sub-modules is,representing the total transmission power of the N sub-modules,the number of sub-modules is indicated.
Further, the first current harmonic coefficient of each sub-module may be calculated as:
in the formula (I), the compound is shown in the specification,is shown asThe harmonic coefficients of the primary currents of the sub-modules,is shown asThe dc side voltage of the low side of the sub-module.
Combining equations (1) and (2), the primary current harmonic vector of the MMC-type DC-DC converter can be expressed as,
in the formula (I), the compound is shown in the specification,representing the vector of the harmonics of the primary current,representing the phase shift angle combination of N sub-modules,indicates to beThe harmonic coefficient of the primary current of the sub-module is taken asReference phase shift angles of the individual submodules.
S200: and (4) iteratively calculating the amplitude of the primary current harmonic vector under different phase shift angle combinations until a set condition is met.
According to the analysis and definition, the primary current harmonic vector of the MMC DC-DC converter can be obtained, and in order to effectively reduce the primary current harmonic to reduce the size and weight of the filter element, an objective function can be setSpecifically, it can be expressed as:
whereinIndicating the first current harmonic vector when the phase shift angle of the first sub-module is set to the reference phase shift angle, and, similarly,indicating the first current harmonic vector when the phase shift angle of the nth sub-module is set as the reference phase shift angle.
The objective function means setting the phase shift angle of the first sub-module as the reference phase shift angle, and then selecting the appropriate phase shift angle combinationSo as to minimize the magnitude of the primary current harmonic vector of the DC-DC converter, and the above selection process is performed by iterative calculations.
In the iterative calculation process of executing the algorithm, a proper maximum error limit needs to be setWhether iteration is terminated is judged, the maximum error limit can be selected as the maximum value of the first harmonic of the inductive current in the iteration process and is continuously updated, and the maximum error limit can be expressed as:
based on the objective function set by the definition formula of the primary current harmonic vector, when the objective function value under different combinations of the phase shift angles is calculated iteratively and is not greater than the set maximum error limit, the amplitude of the primary current harmonic vector at the moment can be considered to meet the set condition.
The iterative computation of the amplitude of the first current harmonic vector under different phase shift angle combinations until the set conditions are met comprises the following steps:
s201: and setting a unit step phase shifting angle and iteration cycle time.
S202: and calculating the amplitude of the primary current harmonic vector under the current phase shift angle combination by using the unit stepping phase shift angle.
When performing the iterative computation, it is necessary to determine an iterative direction to perform the iterative computation. Specifically, there are two iteration directions, i.e., can beCan also be. When selecting the iteration direction, the first current harmonic error in two iteration directions should be judged and calculated first(corresponding to an increase in) And(corresponding to reduction in) It can be expressed in particular as:
in the formula (I), the compound is shown in the specification,representing the first current harmonic error of the phase shift angle combination at increasing unit step phase shift angle,representing the first current harmonic error of the phase shift angle combination in reducing the unit step phase shift angle,representing the unit step phase shift angle.
S203: and judging whether the amplitude of the primary current harmonic vector under the current phase shift angle combination meets a set condition within the iteration cycle time, if not, continuously updating the phase shift angle combination, iteratively calculating the amplitude of the corresponding primary current harmonic vector until the set condition is met, and taking the phase shift angle combination meeting the set condition as a reference phase shift angle combination so as to carry out subsequent steps.
Namely, the first current harmonic error in two iteration directions when the phase shift angle combination is increased or decreased in unit stepping phase shift angle needs to be calculated; and judging the magnitude of the primary current harmonic error in the two iteration directions, and selecting the iteration direction with the smaller primary current harmonic error for calculation in the next iteration calculation. Utensil for cleaning buttockPhysically, if the iteration error of the two is satisfiedThen the reference phase shift angle calculated iteratively in the next step should be selected(ii) a Otherwise, the reference phase shift angle of the next iteration calculation should be selected as。
And performing iterative computation on different phase shift angle combinations according to the iterative computation method until the primary current harmonic corresponding to the selected phase shift angle combination meets the set iterative error limit.
S300: and executing the phase shift angle combination meeting the set condition as the reference phase shift angle combination of the next control period.
Within the set iteration period time Tr, if the iteration calculation result of the selected phase shift angle combination meets the set iteration error limit, the iteration can be stopped and the phase shift angle combination is used as the reference phase shift angle combination of the next control period to be executed; otherwise, go back to S200 to continue to perform new iterative calculations.
The embodiment provides a method for eliminating primary current harmonic of an MMC type DC-DC converter, which defines the primary current harmonic of the high-voltage side of the MMC type DC-DC converter by analyzing the basic operation mechanism of the MMC type DC-DC converter and acquires the amplitude of the primary current harmonic; and then, taking the primary current harmonic amplitude of the MMC type DC-DC converter as a target function, changing the carrier phase shift angle combination of each submodule and carrying out continuous iterative calculation, and comparing the primary current ripple sizes of the converters under different phase shift angles to select the optimal phase shift angle combination, thereby achieving the purpose of reducing the current harmonic of the high-voltage side. Compared with the traditional carrier phase shift calculation, the method can effectively reduce the high-voltage side current harmonic of the MMC type DC-DC converter, and reduce the size of a high-voltage side filter reactor, thereby reducing the system cost.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
- A method for eliminating a primary current harmonic of an MMC type DC-DC converter is characterized by comprising the following steps:defining a primary current harmonic vector of the MMC type DC-DC converter by utilizing the duty ratio of each submodule, wherein the definition formula of the primary current harmonic vector is specifically as follows:in the formula (I), the compound is shown in the specification,representing the vector of the harmonics of the primary current,representing the phase shift angle combination of N sub-modules,the number of sub-modules is indicated,is shown asThe harmonic coefficients of the primary currents of the sub-modules,indicates to beThe harmonic coefficient of the primary current of the sub-module is taken asThe reference phase shift angle of the individual sub-modules,whereinIs shown asThe dc side voltage on the low side of the sub-module,is shown asThe duty cycle of the sub-module;iteratively calculating the amplitude of the primary current harmonic vector under different phase shift angle combinations until a set condition is met;and executing the phase shift angle combination meeting the set condition as a reference phase shift angle combination of the next control period.
- 2. Method for the elimination of the first harmonic of the current of a DC-DC converter of MMC type according to claim 1, characterized in that said second stepDuty cycle of sub-moduleThe calculation formula (2) is specifically as follows:
- 3. The method for eliminating the primary current harmonic of the MMC-type DC-DC converter according to claim 1, wherein iteratively calculating the magnitudes of the primary current harmonic vectors at different phase shift angle combinations until a set condition is satisfied specifically comprises:setting an objective function based on a definitional representation of the primary current harmonic vector,WhereinTo representThe phase shift angle of the first sub-module is set as the first current harmonic vector at the reference phase shift angle, and, similarly,representing a primary current harmonic vector when the phase shift angle of the Nth sub-module is set as a reference phase shift angle;and iteratively calculating the objective function value under different phase shift angle combinations until the objective function value is not greater than a set maximum error limit, so that the amplitude of the primary current harmonic vector meets a set condition.
- 5. The method for eliminating the primary current harmonic of the MMC-type DC-DC converter according to claim 1 or 3, wherein iteratively calculating the magnitudes of the primary current harmonic vectors at different combinations of phase shift angles until the predetermined condition is satisfied specifically comprises:setting a unit stepping phase shift angle and iteration cycle time;calculating the amplitude of the primary current harmonic vector under the current phase shift angle combination by using the unit stepping phase shift angle;and judging whether the amplitude of the primary current harmonic vector under the current phase shift angle combination in the iteration cycle time meets a set condition, if not, continuously updating the phase shift angle combination, iteratively calculating the corresponding amplitude of the primary current harmonic vector until the set condition is met, and taking the phase shift angle combination meeting the set condition as the reference phase shift angle combination so as to carry out subsequent steps.
- 6. The method for eliminating the primary current harmonic of the MMC type DC-DC converter according to claim 5, wherein the calculation of the magnitude of the primary current harmonic vector under the current phase shift angle combination by using the unit step phase shift angle is specifically as follows:calculating the first current harmonic error of the phase shift angle combination in two iteration directions when the unit stepping phase shift angle is increased or decreased;and judging the magnitude of the primary current harmonic error in the two iteration directions, and selecting the iteration direction with the smaller primary current harmonic error for calculation in the next iteration calculation.
- 7. The method for eliminating the primary current harmonic of the MMC type DC-DC converter according to claim 6, characterized in that the primary current harmonic errors in two iteration directions are specifically:in the formula (I), the compound is shown in the specification,representing the first current harmonic error of the phase shift angle combination at increasing said unit step phase shift angle,representing the first current harmonic error of the phase shift angle combination in reducing the unit step phase shift angle,representing the unit step phase shift angle.
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