Method and device for calculating control parameters of isomerized direct-current micro-grid

Abstract

The invention is suitable for the technical field of power grid control, and provides an isomerization direct current micro-grid control parameter calculation method and device, and the method comprises the steps: carrying out the equivalent processing of a target isomerization direct current micro-grid, and obtaining an equivalent converter model; calculating a current proportionality coefficient, a current integral coefficient, a voltage proportionality coefficient, a voltage integral coefficient and a droop coefficient of the equivalent converter model based on the equivalent converter model; and calculating a current control parameter, a voltage control parameter and a droop coefficient of the interleaved three-level DC / DC converter and a current control parameter, a voltage control parameter and a droop coefficient of the conventional two-level DC / DC converter based on the current proportionality coefficient, the current integral coefficient, the voltage proportionality coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model. The problem that the control parameters of the isomerized direct-current micro-grid are difficult to calculate in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power grid control, and particularly relates to a control parameter calculation method and device for a heterogeneous DC microgrid. BACKGROUND

[0002] A heterogeneous DC microgrid is usually composed of multiple types and different numbers of converters, and has characteristics such as low inertia, weak damping, complexity and high order. Therefore, the heterogeneous DC microgrid is prone to oscillation instability. Reasonable control parameters are an important means to ensure the stability of the heterogeneous DC microgrid. However, the dynamic interaction between different types of converters is very complex, and there is also a variety of time scale dynamic interweaving between different control loops. Therefore, the control parameter calculation of the heterogeneous DC microgrid is significantly more difficult than that of a single-converter DC microgrid and a homogeneous DC microgrid containing multiple same-type converters.

[0003] For a single-converter DC microgrid and a homogeneous DC microgrid containing multiple same-type converters, related technologies have provided control parameter calculation schemes. It is worth noting that the coupling mechanism of control parameters between same-type converters is consistent, while the coupling mechanism of control parameters between different types of converters is significantly different. Therefore, it is difficult to directly apply the control parameter calculation method of the homogeneous DC microgrid to the heterogeneous DC microgrid. SUMMARY

[0004] The embodiments of the application provide a control parameter calculation method and device for a heterogeneous DC microgrid to solve the problem that it is difficult to calculate the control parameters of the heterogeneous DC microgrid in the prior art.

[0005] The application is implemented by the following technical solutions: In a first aspect, the embodiments of the application provide a control parameter calculation method for a heterogeneous DC microgrid, applied to a heterogeneous DC microgrid containing interleaved three-level DC / DC converters and conventional two-level DC / DC converters, and the method comprises: equivalent processing of a target heterogeneous DC microgrid to obtain an equivalent converter model.

[0006] Based on the equivalent converter model, current proportional coefficients, current integral coefficients, voltage proportional coefficients, voltage integral coefficients and droop coefficients of the equivalent converter model are calculated.

[0007] Based on the current proportional coefficients, current integral coefficients, voltage proportional coefficients, voltage integral coefficients and droop coefficients of the equivalent converter model, current control parameters, voltage control parameters and droop coefficients of the interleaved three-level DC / DC converters and current control parameters, voltage control parameters and droop coefficients of the conventional two-level DC / DC converters are calculated.

[0008] With reference to the first aspect, in some possible implementation manners, based on the equivalent converter model, the current proportional coefficient, the current integral coefficient, the voltage proportional coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model are calculated, including: Based on the equivalent converter model, a current closed-loop transfer function is obtained; based on the current closed-loop transfer function, the current proportional coefficient and the current integral coefficient are obtained.

[0009] Based on the equivalent converter model, the current proportional coefficient and the current integral coefficient, a voltage closed-loop transfer function is obtained; based on the voltage closed-loop transfer function, the voltage proportional coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model are obtained.

[0010] With reference to the first aspect, in some possible implementation manners, based on the equivalent converter model, the current closed-loop transfer function is obtained, including: The current closed-loop transfer function is calculated by using a first formula.

[0011] The first formula is:

[0012] wherein, denotes the current closed-loop transfer function, denotes the current proportional coefficient of the equivalent converter model, denotes the current integral coefficient of the equivalent converter model, is a filter capacitance of the equivalent converter model, is a duty ratio of the equivalent converter model, is a Laplace operator, is an equivalent resistance, is a direct-current bus voltage, denotes a filter inductance of the equivalent converter model.

[0013] With reference to the first aspect, in some possible implementation manners, based on the equivalent converter model, the current proportional coefficient and the current integral coefficient, the voltage closed-loop transfer function is obtained, including: The voltage closed-loop transfer function is calculated by using a second formula.

[0014] The second formula is:

[0015] wherein, denotes the voltage closed-loop transfer function, denotes the droop coefficient of the equivalent converter model, denotes the current proportional coefficient of the equivalent converter model, denotes the current integral coefficient of the equivalent converter model, a voltage proportional coefficient of the equivalent converter model, a voltage integral coefficient of the equivalent converter model, a duty ratio of the equivalent converter model, a Laplace operator, an equivalent resistance, a DC bus voltage, an equivalent capacitance, a filter inductance of the equivalent converter model.

[0016] With reference to the first aspect, in some possible implementation manners, the current control parameter, the voltage control parameter and the droop coefficient of the interleaved parallel three-level DC / DC converter and the current control parameter, the voltage control parameter and the droop coefficient of the conventional two-level DC / DC converter are calculated based on the current proportional coefficient, the current integral coefficient, the voltage proportional coefficient, the voltage integral coefficient and the droop coefficient of the equivalent converter model, and the current control parameter, the voltage control parameter and the droop coefficient of the interleaved parallel three-level DC / DC converter and the current control parameter, the voltage control parameter and the droop coefficient of the conventional two-level DC / DC converter are calculated by comprising the following steps. The current control parameter of the interleaved parallel three-level DC / DC converter and the current control parameter of the conventional two-level DC / DC converter are calculated based on the current proportional coefficient and the current integral coefficient of the equivalent converter model.

[0017] The voltage control parameter of the interleaved parallel three-level DC / DC converter and the voltage control parameter of the conventional two-level DC / DC converter are calculated based on the voltage proportional coefficient and the voltage integral coefficient of the equivalent converter model.

[0018] The droop coefficient of the interleaved parallel three-level DC / DC converter and the droop coefficient of the conventional two-level DC / DC converter are calculated based on the droop coefficient of the equivalent converter model.

[0019] With reference to the first aspect, in some possible implementation manners, the current control parameter of the interleaved parallel three-level DC / DC converter and the current control parameter of the conventional two-level DC / DC converter are calculated based on the current proportional coefficient and the current integral coefficient of the equivalent converter model, and the current control parameter of the interleaved parallel three-level DC / DC converter and the current control parameter of the conventional two-level DC / DC converter are calculated by comprising the following steps. The current control parameter of the interleaved parallel three-level DC / DC converter is calculated based on the current proportional coefficient and the current integral coefficient of the equivalent converter model by using a third formula.

[0020] The current control parameter of the conventional two-level DC / DC converter is calculated based on the current proportional coefficient and the current integral coefficient of the equivalent converter model by using a fourth formula.

[0021] The third formula is as follows:

[0022] wherein, k T_pix and kT_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current and integral current of each loop. L f The filter inductance represents the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model.

[0023] The fourth formula is:

[0024] in, k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter. L C_f This refers to the filter inductor of a conventional two-level DC / DC converter.

[0025] In conjunction with the first aspect, in some possible implementations, based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter and the voltage control parameters of the conventional two-level DC / DC converter are calculated, including: Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter are calculated using the fifth formula.

[0026] Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of a conventional two-level DC / DC converter are calculated using the sixth formula.

[0027] The fifth formula is:

[0028] in, k T_pvx and k T_ivx These represent the voltage control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The voltage proportional coefficient and voltage integral coefficient of each circuit.L f The filter inductance represents the equivalent converter model. h T This refers to the current sharing factor for an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model. k pv This represents the voltage proportionality coefficient of the equivalent converter model. k iv This represents the voltage integral coefficient of the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current coefficient and integral current coefficient of each loop.

[0029] The sixth formula is:

[0030] in, k C_pv and k C_iv These represent the voltage control parameters of a conventional two-level DC / DC converter, specifically the voltage proportional coefficient and voltage integral coefficient. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum equals 1. L C_f This refers to the filter inductance of a conventional two-level DC / DC converter. k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter.

[0031] In conjunction with the first aspect, in some possible implementations, based on the droop coefficient of the equivalent converter model, the droop coefficient of the interleaved parallel three-level DC / DC converter and the droop coefficient of the conventional two-level DC / DC converter are calculated, including: Based on the droop coefficient of the equivalent converter model and combined with the seventh formula, the droop coefficient of the interleaved parallel three-level DC / DC converter is calculated.

[0032] Based on the droop coefficient of the equivalent converter model and combined with the eighth formula, the droop coefficient of a conventional two-level DC / DC converter is calculated.

[0033] The seventh formula is:

[0034] in, k T_dx This represents the droop factor of an interleaved parallel three-level DC / DC converter. k d This represents the droop coefficient of the equivalent converter model. h T This refers to the current equalization factor for an interleaved parallel three-level DC / DC converter; The eighth formula is:

[0035] in, k C_d This represents the droop factor of a conventional two-level DC / DC converter. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum of them equals 1.

[0036] In conjunction with the first aspect, in some possible implementations, heterogeneous DC microgrids also include constant power loads.

[0037] Secondly, embodiments of this application provide a device for calculating control parameters of a heterogeneous DC microgrid, including: The equivalent processing module is used to perform equivalent processing on the target heterogeneous DC microgrid to obtain an equivalent converter model.

[0038] The first calculation module is used to calculate the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model based on the equivalent converter model.

[0039] The second calculation module is used to calculate the current control parameters, voltage control parameters, and droop coefficient of an interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of a conventional two-level DC / DC converter, based on the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model.

[0040] It is understandable that the beneficial effects of the second aspect mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0041] The beneficial effects of the embodiments in this application compared with the prior art are: This application first constructs an equivalent converter model and its transfer function for a heterogeneous DC microgrid. Then, based on this transfer function, the current control parameters, voltage control parameters, and droop coefficient of the equivalent converter model are designed. Finally, using the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient in the equivalent converter model, the current control parameters, voltage control parameters, and droop coefficients of both the interleaved parallel three-level DC / DC converter and the traditional two-level DC / DC converter are calculated. This method can directly calculate the control parameters of a heterogeneous DC microgrid, effectively solving the problem of calculating the control parameters of heterogeneous DC microgrids in existing technologies.

[0042] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a flowchart illustrating a method for calculating control parameters of a heterogeneous DC microgrid according to an embodiment of this application. Figure 2 This is a topology diagram of a heterogeneous DC microgrid provided in one embodiment of this application; Figure 3 This is a topology diagram of an equivalent converter model provided in an embodiment of this application; Figure 4 This is a zero-pole diagram of the first group of control parameters provided in an embodiment of this application; Figure 5 This is a zero-pole diagram of the second set of control parameters provided in an embodiment of this application; Figure 6 This is a zero-pole plot of the third group of control parameters provided in an embodiment of this application; Figure 7 This is an experimental result of a heterogeneous DC microgrid provided in an embodiment of this application at the first set of control parameters; Figure 8 This is the experimental result of the equivalent converter model provided in one embodiment of this application at the first set of control parameters; Figure 9 This is an experimental result of the heterogeneous DC microgrid provided in one embodiment of this application at the second set of control parameters; Figure 10 This is the experimental result of the equivalent converter model provided in one embodiment of this application at the second set of control parameters; Figure 11 This is the experimental result of a heterogeneous DC microgrid provided in an embodiment of this application at the third group of control parameters; Figure 12 This is the experimental result of the equivalent converter model provided in one embodiment of this application at the third group of control parameters; Figure 13 This is a schematic diagram of the structure of a heterogeneous DC microgrid control parameter calculation device provided in one embodiment of this application. Detailed Implementation

[0045] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0046] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0047] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0048] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0049] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0050] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0051] The method for calculating control parameters of heterogeneous DC microgrids provided in this application embodiment Figure 1 This is a schematic flowchart illustrating a method for calculating control parameters of a heterogeneous DC microgrid according to an embodiment of this application. (Refer to...) Figure 1 The detailed method for calculating the control parameters of this heterogeneous DC microgrid is as follows: Step 101: Perform equivalent processing on the target heterogeneous DC microgrid to obtain the equivalent converter model.

[0052] For example, the topology of a heterogeneous DC microgrid is as follows: Figure 2 As shown, this heterogeneous DC microgrid consists of an interleaved parallel three-level DC / DC converter, a conventional two-level DC / DC converter, and an ideal constant power load. The interleaved parallel three-level DC / DC converter contains two loops, each containing an upper branch and a lower branch. Figure 2 middle, L T_fux and L T_fdx These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The upper branch filter inductor and the lower branch filter inductor of each circuit ( x =1,2);I T_sux and I T_sdx These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The current of the filter inductor in the upper branch and the current of the filter inductor in each circuit; C T_fux and C T_fdx These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The upper branch filter capacitor and the lower branch filter capacitor of each circuit; k T_pvx and k T_ivx These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The voltage proportional coefficient and voltage integral coefficient of each circuit; k T_pix and k T_iix These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The proportional current coefficient and integral current coefficient of each loop. k T_dx and V T_rx These are the first three-level DC / DC converters connected in parallel with interleaved connections. x The droop factor and voltage reference value of each circuit; I T_rx and D T_x These are the first three-level DC / DC converters connected in parallel with interleaved connections. x Reference values ​​and duty cycles of the filter inductor current for each circuit; I T_o and I C_o The output currents of the interleaved parallel three-level DC / DC converter and the conventional two-level DC / DC converter are respectively. g 1_1 and g 1_2 All of these are modulation signals for the first loop of an interleaved parallel three-level DC / DC converter; g 2_1 and g 2_2 All of these are modulation signals for the second circuit of an interleaved parallel three-level DC / DC converter; k C_d and V C_r These are the droop factor and voltage reference value for a conventional two-level DC / DC converter, respectively. k C_pv and kC_iv These are the voltage proportional coefficient and voltage integral coefficient of a conventional two-level DC / DC converter, respectively. k C_pi and k C_ii These are the current proportional coefficient and current integral coefficient of a conventional two-level DC / DC converter, respectively. g 3 and g 4 are all modulation signals of conventional two-level DC / DC converters; I C_s and I C_r These are the filter inductor current and the filter inductor current reference value for a conventional two-level DC / DC converter, respectively. L C_f and C C_f These are the filter inductor and filter capacitor of a conventional two-level DC / DC converter; D C This refers to the duty cycle of a conventional two-level DC / DC converter. U s This refers to the power supply voltage. V This is the DC bus voltage. P and I o The power and current values ​​for a constant power load; ʃ, d and t These are the integral symbol, the differential operator, and time, respectively.

[0053] For example, for Figure 2 The heterogeneous DC microgrid shown can be equivalently processed to obtain... Figure 3 The equivalent converter model shown is illustrated. Figure 3 middle, k d and V r These are the droop coefficient and voltage reference value of the equivalent converter model, respectively; k pv and k iv These are the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, respectively. k pi and k ii These are the current proportional coefficient and current integral coefficient of the equivalent converter model, respectively; g 5 and g 6 are all modulation signals of the equivalent converter model; I s and I rThese are the filter inductor current and the filter inductor current reference value for the equivalent converter model, respectively. L f and C f These are the filter inductance and filter capacitor of the equivalent converter model, respectively. D s This represents the duty cycle of the equivalent converter model.

[0054] Step 102: Based on the equivalent converter model, calculate the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model.

[0055] For example, step 102 may include: Based on the equivalent converter model, the current closed-loop transfer function is obtained; based on the current closed-loop transfer function, the current proportional coefficient and the current integral coefficient are obtained.

[0056] Based on the equivalent converter model, current proportional coefficient, and current integral coefficient, the voltage closed-loop transfer function is obtained; based on the voltage closed-loop transfer function, the voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model are obtained.

[0057] For example, based on the equivalent converter model, the current closed-loop transfer function can be obtained, which may include: The first formula is used to calculate the current closed-loop transfer function.

[0058] The first formula can be:

[0059] in, This represents the closed-loop transfer function of the current. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. The filter capacitor is the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. This represents the filter inductance of the equivalent converter model.

[0060] For example, based on the equivalent converter model, current proportional coefficient, and current integral coefficient, the voltage closed-loop transfer function can be obtained, which may include: The second formula is used to calculate the voltage closed-loop transfer function.

[0061] The second formula can be:

[0062] in, This represents the voltage closed-loop transfer function. This represents the droop coefficient of the equivalent converter model. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. This represents the voltage proportionality coefficient of the equivalent converter model. This represents the voltage integral coefficient of the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. This represents the equivalent capacitance. This represents the filter inductance of the equivalent converter model.

[0063] Step 103: Based on the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model, calculate the current control parameters, voltage control parameters, and droop coefficient of the interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of the conventional two-level DC / DC converter.

[0064] For example, step 103 may include: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the current control parameters of the interleaved parallel three-level DC / DC converter and the current control parameters of the conventional two-level DC / DC converter are calculated.

[0065] Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter and the voltage control parameters of the conventional two-level DC / DC converter are calculated.

[0066] Based on the droop coefficient of the equivalent converter model, the droop coefficient of the interleaved parallel three-level DC / DC converter and the droop coefficient of the conventional two-level DC / DC converter are calculated.

[0067] For example, calculating the current control parameters of an interleaved three-level DC / DC converter and a conventional two-level DC / DC converter based on the current proportional coefficient and current integral coefficient of the equivalent converter model can include: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the third formula is used to calculate the current control parameters of the interleaved parallel three-level DC / DC converter.

[0068] Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the fourth formula is used to calculate the current control parameters of a conventional two-level DC / DC converter.

[0069] The third formula can be:

[0070] in, k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current and integral current of each loop. L f The filter inductance represents the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model.

[0071] The fourth formula can be:

[0072] in, k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter. L C_f This refers to the filter inductor of a conventional two-level DC / DC converter.

[0073] For example, calculating the voltage control parameters of an interleaved three-level DC / DC converter and a conventional two-level DC / DC converter based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model can include: Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter are calculated using the fifth formula.

[0074] Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of a conventional two-level DC / DC converter are calculated using the sixth formula.

[0075] The fifth formula can be:

[0076] in, k T_pvx and k T_ivx These represent the voltage control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The voltage proportional coefficient and voltage integral coefficient of each circuit. L f The filter inductance represents the equivalent converter model. h T This refers to the current sharing factor for an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model. k pv This represents the voltage proportionality coefficient of the equivalent converter model. k iv This represents the voltage integral coefficient of the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current coefficient and integral current coefficient of each loop.

[0077] The sixth formula can be:

[0078] in, k C_pv and k C_iv These represent the voltage control parameters of a conventional two-level DC / DC converter, specifically the voltage proportional coefficient and voltage integral coefficient. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum equals 1. L C_f This refers to the filter inductance of a conventional two-level DC / DC converter. k C_pi andk C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter.

[0079] For example, calculating the droop coefficient of an interleaved three-level DC / DC converter and a conventional two-level DC / DC converter based on the droop coefficient of the equivalent converter model can include: Based on the droop coefficient of the equivalent converter model and combined with the seventh formula, the droop coefficient of the interleaved parallel three-level DC / DC converter is calculated.

[0080] Based on the droop coefficient of the equivalent converter model and combined with the eighth formula, the droop coefficient of a conventional two-level DC / DC converter is calculated.

[0081] The seventh formula can be:

[0082] in, k T_dx This represents the droop factor of an interleaved parallel three-level DC / DC converter. k d This represents the droop coefficient of the equivalent converter model. h T This refers to the current equalization factor for an interleaved parallel three-level DC / DC converter; The eighth formula can be:

[0083] in, k C_d This represents the droop factor of a conventional two-level DC / DC converter. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum of them equals 1.

[0084] For heterogeneous DC microgrids composed of interleaved parallel three-level DC / DC converters and traditional two-level DC / DC converters, this study proposes a method for calculating the control parameters of heterogeneous DC microgrids. First, an equivalent converter model and its transfer function for the heterogeneous DC microgrid are constructed. Then, based on this transfer function, the current control parameters, voltage control parameters, and droop coefficient of the equivalent converter model are designed. Further, using the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient in the equivalent converter model, the current control parameters, voltage control parameters, and droop coefficients of the interleaved parallel three-level DC / DC converter and the traditional two-level DC / DC converter are calculated. This method can directly calculate the control parameters of heterogeneous DC microgrids, effectively solving the problem of calculating the control parameters of heterogeneous DC microgrids in existing technologies.

[0085] To verify the effectiveness of the control parameter calculation method for heterogeneous DC microgrids proposed in this invention, theoretical calculations and experimental verifications of three sets of control parameters are performed below. Based on... Figure 1 The method for calculating control parameters of a heterogeneous DC microgrid, as shown, calculates the first, second, and third groups of control parameters for the equivalent converter model. The zero-pole plots for the first, second, and third groups of control parameters are shown below. Figure 4 , Figure 5 and Figure 6 As shown. By Figure 4 , Figure 5 and Figure 6 It can be seen that the theoretical oscillation frequencies of the equivalent converter model at the control parameters of the first, second and third groups are 8.84Hz, 35.41Hz and 106.01Hz, respectively.

[0086] A test platform for RT-Box hardware in the ring was built. Figure 2 The heterogeneous DC microgrid switch model shown and Figure 3 The equivalent converter model shown is shown.

[0087] At 0.1 seconds, the power of the constant power load jumps from 0.7kW to 1.4kW. The experimental results of the DC bus voltage at the first set of control parameters for the heterogeneous DC microgrid and its equivalent converter model are as follows: Figure 7 and Figure 8 As shown. By Figure 7 and Figure 8 It can be seen that the experimental results of the DC bus voltage of the heterogeneous DC microgrid and its equivalent converter model are almost identical. Furthermore, Figure 7 and Figure 8 The experimental results show that the oscillation frequency is approximately 8.45 Hz, which is consistent with... Figure 4The theoretical oscillation frequency of 8.84Hz is basically consistent with the above, which verifies the effectiveness of the control parameter calculation method for heterogeneous DC microgrids proposed in this invention.

[0088] Under the same power disturbance conditions, the experimental results of the DC bus voltage of the heterogeneous DC microgrid and its equivalent converter model at the second set of control parameters are as follows: Figure 9 and Figure 10 As shown. By Figure 9 and Figure 10 It can be seen that the experimental results of the DC bus voltage of the heterogeneous DC microgrid and its equivalent converter model are almost consistent. Furthermore, Figure 9 and Figure 10 The experimental results show that the oscillation frequency is approximately 35.59 Hz, which is consistent with... Figure 5 The theoretical oscillation frequency of 35.41Hz is basically the same, which verifies the effectiveness of the control parameter calculation method for heterogeneous DC microgrids proposed in this invention.

[0089] Under the same power disturbance conditions, the experimental results of the DC bus voltage of the heterogeneous DC microgrid and its equivalent converter model at the third set of control parameters are as follows: Figure 11 and Figure 12 As shown. By Figure 11 and Figure 12 It can be seen that the experimental results of the DC bus voltage of the heterogeneous DC microgrid and its equivalent converter model are almost consistent. Furthermore, Figure 11 and Figure 12 The experimental results show that the oscillation frequency is approximately 105.26 Hz, which is consistent with... Figure 6 The theoretical oscillation frequency of 106.01Hz is basically the same, which verifies the effectiveness of the control parameter calculation method for heterogeneous DC microgrids proposed in this invention.

[0090] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0091] Corresponding to the heterogeneous DC microgrid control parameter calculation method described in the above embodiments, Figure 13 A structural block diagram of the heterogeneous DC microgrid control parameter calculation device provided in the embodiments of this application is shown. For ease of explanation, only the parts related to the embodiments of this application are shown.

[0092] See Figure 13 The heterogeneous DC microgrid control parameter calculation device in this application embodiment may include: The equivalent processing module 201 is used to perform equivalent processing on the target heterogeneous DC microgrid to obtain an equivalent converter model.

[0093] The first calculation module 202 is used to calculate the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model based on the equivalent converter model.

[0094] The second calculation module 203 is used to calculate the current control parameters, voltage control parameters, and droop coefficient of an interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of a conventional two-level DC / DC converter, based on the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model.

[0095] For example, the first computing module 202 can be used to: Based on the equivalent converter model, the current closed-loop transfer function is obtained; based on the current closed-loop transfer function, the current proportional coefficient and the current integral coefficient are obtained.

[0096] Based on the equivalent converter model, current proportional coefficient, and current integral coefficient, the voltage closed-loop transfer function is obtained; based on the voltage closed-loop transfer function, the voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model are obtained.

[0097] For example, the first computing module 202 can be used to: The first formula is used to calculate the current closed-loop transfer function.

[0098] The first formula can be:

[0099] in, This represents the closed-loop transfer function of the current. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. The filter capacitor is the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. This represents the filter inductance of the equivalent converter model.

[0100] For example, the first computing module 202 can be used to: The second formula is used to calculate the voltage closed-loop transfer function.

[0101] The second formula can be:

[0102] in, This represents the voltage closed-loop transfer function. This represents the droop coefficient of the equivalent converter model. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. This represents the voltage proportionality coefficient of the equivalent converter model. This represents the voltage integral coefficient of the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. This represents the equivalent capacitance. This represents the filter inductance of the equivalent converter model.

[0103] For example, the second computing module 203 can be used to: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the current control parameters of the interleaved parallel three-level DC / DC converter and the current control parameters of the conventional two-level DC / DC converter are calculated.

[0104] Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter and the voltage control parameters of the conventional two-level DC / DC converter are calculated.

[0105] Based on the droop coefficient of the equivalent converter model, the droop coefficient of the interleaved parallel three-level DC / DC converter and the droop coefficient of the conventional two-level DC / DC converter are calculated.

[0106] For example, the second computing module 203 can be used to: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the third formula is used to calculate the current control parameters of the interleaved parallel three-level DC / DC converter.

[0107] Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the fourth formula is used to calculate the current control parameters of a conventional two-level DC / DC converter.

[0108] The third formula can be:

[0109] in, k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first...x The proportional current and integral current of each loop. L f The filter inductance represents the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model.

[0110] The fourth formula can be:

[0111] in, k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter. L C_f This refers to the filter inductor of a conventional two-level DC / DC converter.

[0112] For example, the second computing module 203 can be used to: Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter are calculated using the fifth formula.

[0113] Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of a conventional two-level DC / DC converter are calculated using the sixth formula.

[0114] The fifth formula can be:

[0115] in, k T_pvx and k T_ivx These represent the voltage control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The voltage proportional coefficient and voltage integral coefficient of each circuit. L f The filter inductance represents the equivalent converter model. h T This refers to the current sharing factor for an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model.k ii This represents the current integral coefficient of the equivalent converter model. k pv This represents the voltage proportionality coefficient of the equivalent converter model. k iv This represents the voltage integral coefficient of the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current coefficient and integral current coefficient of each loop.

[0116] The sixth formula can be:

[0117] in, k C_pv and k C_iv These represent the voltage control parameters of a conventional two-level DC / DC converter, specifically the voltage proportional coefficient and voltage integral coefficient. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum equals 1. L C_f This refers to the filter inductance of a conventional two-level DC / DC converter. k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter.

[0118] For example, the second computing module 203 can be used to: Based on the droop coefficient of the equivalent converter model and combined with the seventh formula, the droop coefficient of the interleaved parallel three-level DC / DC converter is calculated.

[0119] Based on the droop coefficient of the equivalent converter model and combined with the eighth formula, the droop coefficient of a conventional two-level DC / DC converter is calculated.

[0120] The seventh formula can be:

[0121] in, k T_dx This represents the droop factor of an interleaved parallel three-level DC / DC converter. k d This represents the droop coefficient of the equivalent converter model. h T This refers to the current equalization factor for an interleaved parallel three-level DC / DC converter; The eighth formula can be:

[0122] in, k C_d This represents the droop factor of a conventional two-level DC / DC converter. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum of them equals 1.

[0123] For example, heterogeneous DC microgrids also include constant power loads.

[0124] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0125] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0126] If the module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above embodiments of the heterogeneous DC microgrid control parameter calculation method. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for calculating control parameters of a heterogeneous DC microgrid, characterized in that, The method, applied to a heterogeneous DC microgrid comprising interleaved parallel three-level DC / DC converters and conventional two-level DC / DC converters, includes: The target heterogeneous DC microgrid is subjected to equivalent processing to obtain an equivalent converter model; Based on the equivalent converter model, calculate the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model. Based on the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model, the current control parameters, voltage control parameters, and droop coefficient of the interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of the conventional two-level DC / DC converter, are calculated.

2. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 1, characterized in that, The calculation of the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model based on the equivalent converter model includes: Based on the equivalent converter model, the current closed-loop transfer function is obtained; based on the current closed-loop transfer function, the current proportional coefficient and the current integral coefficient are obtained. Based on the equivalent converter model, the current proportional coefficient, and the current integral coefficient, the voltage closed-loop transfer function is obtained; based on the voltage closed-loop transfer function, the voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model are obtained.

3. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 2, characterized in that, The current closed-loop transfer function obtained based on the equivalent converter model includes: The current closed-loop transfer function is calculated using the first formula. The first formula is: in, This represents the current closed-loop transfer function. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. The filter capacitor is the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. This represents the filter inductance of the equivalent converter model.

4. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 2, characterized in that, The process of obtaining the voltage closed-loop transfer function based on the equivalent converter model, the current proportional coefficient, and the current integral coefficient includes: The voltage closed-loop transfer function is calculated using the second formula. The second formula is: in, This represents the voltage closed-loop transfer function. This represents the droop coefficient of the equivalent converter model. This represents the current proportionality coefficient of the equivalent converter model. This represents the current integral coefficient of the equivalent converter model. This represents the voltage proportionality coefficient of the equivalent converter model. This represents the voltage integral coefficient of the equivalent converter model. The duty cycle of the equivalent converter model. For the Laplace operator, Equivalent resistance This is the DC bus voltage. Indicates the equivalent capacitance. This represents the filter inductance of the equivalent converter model.

5. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 1, characterized in that, The current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient based on the equivalent converter model are used to calculate the current control parameters, voltage control parameters, and droop coefficient of an interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of a conventional two-level DC / DC converter, including: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the current control parameters of the interleaved parallel three-level DC / DC converter and the current control parameters of the conventional two-level DC / DC converter are calculated. Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, calculate the voltage control parameters of the interleaved parallel three-level DC / DC converter and the voltage control parameters of the conventional two-level DC / DC converter. Based on the droop coefficient of the equivalent converter model, the droop coefficient of the interleaved parallel three-level DC / DC converter and the droop coefficient of the conventional two-level DC / DC converter are calculated.

6. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 5, characterized in that, The calculation of current control parameters for an interleaved three-level DC / DC converter and a conventional two-level DC / DC converter, based on the current proportional coefficient and current integral coefficient of the equivalent converter model, includes: Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the current control parameters of the interleaved parallel three-level DC / DC converter are calculated using the third formula. Based on the current proportional coefficient and current integral coefficient of the equivalent converter model, the fourth formula is used to calculate the current control parameters of a conventional two-level DC / DC converter. The third formula is: in, k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current and integral current of each loop. L f The filter inductance represents the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii Represents the current integral coefficient of the equivalent converter model; The fourth formula is: in, k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter. L C_f This refers to the filter inductor of a conventional two-level DC / DC converter.

7. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 5, characterized in that, The voltage control parameters of the interleaved parallel three-level DC / DC converter and the voltage control parameters of the conventional two-level DC / DC converter are calculated based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, including: Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of the interleaved parallel three-level DC / DC converter are calculated using the fifth formula. Based on the voltage proportional coefficient and voltage integral coefficient of the equivalent converter model, the voltage control parameters of a conventional two-level DC / DC converter are calculated using the sixth formula. The fifth formula is: in, k T_pvx and k T_ivx These represent the voltage control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The voltage proportional coefficient and voltage integral coefficient of each circuit. L f The filter inductance represents the equivalent converter model. h T This refers to the current sharing factor for an interleaved parallel three-level DC / DC converter. k pi This represents the current proportionality coefficient of the equivalent converter model. k ii This represents the current integral coefficient of the equivalent converter model. k pv This represents the voltage proportionality coefficient of the equivalent converter model. k iv This represents the voltage integral coefficient of the equivalent converter model. L T_fx This represents the filter inductor of an interleaved parallel three-level DC / DC converter. k T_pix and k T_iix These represent the current control parameters of the interleaved parallel three-level DC / DC converter, and respectively represent the first... x The proportional current coefficient and integral current coefficient of each loop. The sixth formula is: in, k C_pv and k C_iv These represent the voltage control parameters of a conventional two-level DC / DC converter, specifically the voltage proportional coefficient and voltage integral coefficient. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum equals 1. L C_f This refers to the filter inductance of a conventional two-level DC / DC converter. k C_pi and k C_ii These represent the current control parameters of a conventional two-level DC / DC converter, and respectively represent the current proportional coefficient and current integral coefficient of the conventional two-level DC / DC converter.

8. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 5, characterized in that, The calculation of the droop coefficient of the interleaved parallel three-level DC / DC converter and the conventional two-level DC / DC converter based on the equivalent converter model includes: Based on the droop coefficient of the equivalent converter model, and in conjunction with the seventh formula, the droop coefficient of the interleaved parallel three-level DC / DC converter is calculated. Based on the droop coefficient of the equivalent converter model, and in conjunction with the eighth formula, the droop coefficient of a conventional two-level DC / DC converter is calculated. The seventh formula is: in, k T_dx This represents the droop factor of an interleaved parallel three-level DC / DC converter. k d This represents the droop coefficient of the equivalent converter model. h T This refers to the current equalization factor for an interleaved parallel three-level DC / DC converter; The eighth formula is: in, k C_d This represents the droop factor of a conventional two-level DC / DC converter. h C This is the current sharing factor for a conventional two-level DC / DC converter, and h T and h C The sum of them equals 1.

9. The method for calculating control parameters of a heterogeneous DC microgrid as described in claim 1, characterized in that, The heterogeneous DC microgrid also includes constant power loads.

10. A device for calculating control parameters of a heterogeneous DC microgrid, characterized in that, include: An equivalent processing module is used to perform equivalent processing on the target heterogeneous DC microgrid to obtain an equivalent converter model. The first calculation module is used to calculate the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model based on the equivalent converter model. The second calculation module is used to calculate the current control parameters, voltage control parameters, and droop coefficient of an interleaved parallel three-level DC / DC converter, as well as the current control parameters, voltage control parameters, and droop coefficient of a conventional two-level DC / DC converter, based on the current proportional coefficient, current integral coefficient, voltage proportional coefficient, voltage integral coefficient, and droop coefficient of the equivalent converter model.

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