Three-phase power dynamic distribution method and three-phase inverter

Abstract

The invention relates to a three-phase power dynamic distribution method, a three-phase inverter and a control unit for the three-phase inverter. The method comprises the following steps: S1, obtaining an inversion power parameter value of each phase, obtaining an electric meter power parameter value of each phase, and obtaining a rated power parameter value of the inverter; s2, calculating the overload power of each phase according to the inverter power parameter value, the ammeter power parameter value and the rated power parameter value, and then generating the overload state of each phase according to the overload power of each phase; and S3, according to the inversion power parameter value of each phase, the rated power parameter value of the inverter and the overload state of each phase, obtaining the power amplitude limiting value of the current overload state. According to the scheme provided by the invention, the distribution result with lower overload power and higher power balance degree of each phase is calculated on the premise of meeting the maximum utilization of the power, and the negative influence caused by long-term overload of a certain phase can be remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage electric meters, and in particular to a three-phase power dynamic distribution method and a three-phase inverter. Background Art

[0002] With the advancement of globalization and the rapid development of renewable energy technology, the market demand for inverters is growing. In overseas business, the application scenarios and demands of inverters are diverse. For example, the photovoltaic energy storage system deployed overseas is equipped with a three-phase inverter, and the utilization rate of the inverter power is not high, which not only affects the customer experience on the demand side, but also puts higher requirements on the after-sales work of R&D manufacturers.

[0003] Therefore, the industry needs to design a technical solution suitable for three-phase inverters to cope with the diversification of application scenarios and demands, especially to improve the utilization rate of inverter power. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to design a three-phase power dynamic distribution method that can effectively solve the above problems.

[0005] In the process of serving overseas customers, the inventor discovered that my country's three-phase inverters serve electricity users such as large factories (relatively stable loads, relatively balanced loads on each phase), and the inverters usually have three-phase balanced outputs; however, in overseas markets, especially the European market, in household power environments (or small commercial power environments of the same level), there is a mix of single-phase loads and three-phase loads. The loads of each phase in such application scenarios vary greatly, and occasional load increases and temporary load peaks force R&D personnel to use peak loads as a reference when designing inverter products. In order to cope with the temporary load peak of a certain phase, the overall power of the inverter is increased, which will affect the power utilization of the inverter. A strategy is needed that can effectively allocate the power according to the load conditions of each phase while keeping the overall inverter power unchanged; on the other hand, single-phase inverters are used in domestic household scenarios, and single-phase inverters do not have this power distribution problem. Based on this, the present application proposes a three-phase power dynamic distribution method and a three-phase inverter, which calculates the distribution results of lower overload power and higher power balance for each phase under the premise of meeting the maximum power utilization, which can significantly reduce the negative impact caused by long-term overload of a certain phase.

[0006] In a first aspect, the present invention proposes a three-phase power dynamic allocation method for a control unit of a three-phase inverter, wherein each phase of the three-phase inverter includes an R phase, an S phase, and a T phase, and the method comprises: S1, obtaining an inverter power parameter value of each phase, obtaining an electric meter power parameter value of each phase, and obtaining a rated power parameter value of the inverter; S2, calculating the overload power of each phase according to the inverter power parameter value, the electric meter power parameter value, and the rated power parameter value, and then generating the overload state of each phase according to the overload power of each phase; S3, obtaining the power limit value of the current overload state according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase.

[0007] Its further technical solution is that S3 obtains the power limit value of the current overload state according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase, including: S31, judging the sum of the effective load powers of each phase, and the relationship between the sum and the rated power parameter value; S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, obtaining the power limit value of the current overload state through the first allocation mode; S33, if the sum of the effective load powers of each phase is not less than the rated power parameter value, obtaining the power limit value of the current overload state through the second allocation mode.

[0008] Its further technical solution is that S1, obtaining the inverter power parameter value of each phase, obtaining the meter power parameter value of each phase, and obtaining the rated power parameter value of the inverter, includes: obtaining the inverter power parameter value of each phase, the inverter power parameter value includes R phase inverter power InvR, S phase inverter power InvS, T phase inverter power InvT; obtaining the meter power parameter value of each phase, the meter power parameter value includes R phase meter power MeterR, S phase meter power MeterS, T phase meter power MeterT; obtaining the rated power parameter value of the inverter, the rated power parameter value is the rated power Pn.

[0009] Its further technical solution is that the rated power Pn multiplied by the coefficient K is equal to the limiting power, and the coefficient K is the preset maximum power coefficient of each phase; the inverter discharge power is defined as positive, and the meter power flowing from the grid side to the inverter side is positive. Based on the definition of the above direction, the effective load power is the inverter power plus the meter power, and the R-phase effective load power LR, the S-phase effective load power LS, and the T-phase effective load power LT are not less than zero; the R-phase effective load power LR is equal to the R-phase inverter power InvR plus the R-phase meter power Meter R and does not exceed the limited power, the S phase effective load power LS is equal to the S phase inverter power InvS plus the S phase meter power MeterS and does not exceed the limited power, and the T phase effective load power LT is equal to the T phase inverter power InvT plus the T phase meter power MeterT and does not exceed the limited power; the S2, according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculates the overload power of each phase, and then generates the overload state of each phase according to the overload power of each phase, including: according to the inverter power parameter value, the meter power parameter value The overload power of the R phase is calculated by using the numerical value and the rated power parameter value, that is, the overload power of the R phase PolR is equal to the R phase inverter power InvR plus the R phase meter power MeterR minus 1 / 3*rated power Pn. Then, if the R phase overload power PolR is greater than zero, the R phase is overloaded, otherwise it is not overloaded, and then the judgment result of the R phase is obtained; according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, the overload power of the S phase is calculated, that is, the S phase overload power PolS is equal to the S phase inverter power InvS plus the S phase meter power Me terS minus 1 / 3*rated power Pn, then judge if the S phase overload power PolS is greater than zero, then the S phase is overloaded, otherwise it is not overloaded, and then obtain the S phase judgment result; according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculate the T phase overload power, that is, the T phase overload power PolT is equal to the T phase inverter power InvT plus the T phase meter power MeterT minus 1 / 3*rated power Pn, then judge if the T phase overload power PolT is greater than zero, then the T phase is overloaded, otherwise it is not overloaded, and then obtain the T phase judgment result. Among them, the coefficient K is the preset maximum power coefficient of each phase, and its value range is [1 / 3, 1], which can be understood by engineers in this field.

[0010] Its further technical solution is that the load connected to the three-phase inverter includes a single-phase load and a three-phase load; the S31, judging the sum of the effective load powers of each phase, and the relationship between the two compared with the rated power parameter value, comprises: calculating the sum of the R-phase effective load power LR plus the S-phase effective load power LS plus the T-phase effective load power LT, and comparing the sum with the rated power Pn, and obtaining a comparison result.

[0011] Its further technical solution is that, in S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, the power limit value of the current overload state is obtained through the first allocation mode, including: if the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is less than the rated power parameter value, the overload conditions of the R phase, the S phase and the T phase are judged; when all phases are not overloaded, the power limit value PR1 is equal to 1 / 3*rated power Pn; the power limit value PS1 is equal to 1 / 3*rated power Pn; the power limit value PT1 is equal to 1 / 3*rated power Pn; when the R phase is overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the effective load power of the R phase The power limit value PS1 is equal to the effective load power LS of the S phase plus the power parameter value TMP1; the power limit value PT1 is equal to the effective load power LT of the T phase plus the power parameter value TMP1; when the S phase is overloaded and the other is not overloaded, the power limit value PR1 is equal to the effective load power LR of the R phase plus the power parameter value TMP1; the power limit value PS1 is equal to the effective load power LS of the S phase; the power limit value PT1 is equal to the effective load power LT of the T phase plus the power parameter value TMP1; when the T phase is overloaded and the other is not overloaded, the power limit value PR1 is equal to the effective load power LR of the R phase plus the power parameter value TMP1; the power limit value PS1 is equal to the effective load power LS of the S phase plus the power parameter value TMP1 Power parameter value TMP1; power limit value PT1 is equal to T phase effective load power LT; the power parameter value TMP1 is equal to the result of the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS minus the T phase effective load power LT, multiplied by one half; in the case where the R phase and the S phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the power parameter value TMP21; the power parameter value TMP21 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; in the case where the R phase and the T phase are overloaded and the other phases are not overloaded In this case, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the power parameter value TMP22; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP22 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; in the case of S phase and T phase overload and other phases not being overloaded, the power limit value PR1 is equal to the power parameter value TMP23; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP23 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT;The result of obtaining the power limit value of the current overload state through the first allocation mode, namely, the power limit value PR1, the power limit value PS1, and the power limit value PT1. ;

[0012] Its further technical solution is that, in S33, if the sum of the effective load powers of each phase is not less than the rated power parameter value, the power limit value of the current overload state is obtained through the second allocation mode, including: if the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is not less than the rated power parameter value, the overload conditions of the R phase, the S phase and the T phase are judged; when all phases are overloaded, the power limit value PR2 is equal to 1 / 3*rated power Pn; the power limit value PS2 is equal to 1 / 3*rated power Pn; the power limit value PT2 is equal to 1 / 3*rated power Pn; when the R phase is overloaded and the other phases are not overloaded, the power limit value PR2 is equal to the power parameter value TMP31; the power limit The amplitude PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP31 is equal to the result of subtracting the S phase effective load power LS from the T phase effective load power LT from the rated power Pn; when the S phase is overloaded and the other phases are not overloaded, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the power parameter value TMP32; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP32 is equal to the result of subtracting the effective load power LoadR from the effective load power LoadT from the rated power Pn; when the T phase is overloaded and the other phases are not overloaded, the power limit value PR2 is equal to the R phase effective load power LR; The power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the power parameter value TMP33; the power parameter value TMP33 is equal to the result of the rated power Pn minus the effective load power LoadR minus the effective load power LoadS; when the R phase and the S phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP4, the judgment of the S phase overload power PolS is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; the power limit value PT2 is equal to the T phase effective load power LT; if the R phase overload power PolR is not less than the power rate parameter value TMP4, and the S phase overload power PolS is less than the power parameter value TMP4, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the T phase effective load power LT; if the R phase overload power PolR is not less than the power parameter value TMP4, and the S phase overload power PolS is not less than the power parameter value TMP4, the power limit value PR2 is equal to 1 / 3*rated power Pn plus power parameter value TMP4; the power limit value PS2 is equal to 1 / 3*rated power Pn plus power parameter value TMP4; the power limit value PT2 is equal to the T phase effective load power LT;The power parameter value TMP4 is equal to the result of 1 / 3*rated power Pn minus T phase effective load power LT, multiplied by one half; when the R phase and T phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP5, the judgment of the T phase overload power PolT is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; if the R phase overload power PolR is not less than the power parameter value TMP5, and the T phase overload power PolT is less than the power parameter value TMP5, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; the power limit value PS2 is equal to the S phase effective load power LS; The power limit value PT2 is equal to the effective load power LT of phase T; if the overload power PolR of phase R is not less than the power parameter value TMP5, and the overload power PolT of phase TMP5 is not less than the power parameter value TMP5, the power limit value PR2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power limit value PS2 is equal to the effective load power LS of phase S; the power limit value PT2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power parameter value TMP5 is equal to the result of subtracting the effective load power LS of phase S from the 1 / 3*rated power Pn, multiplied by one half; in the case of overload of phase S and phase T but not overload of other phases, if the overload power PolS of phase S is less than the power parameter value TMP6, the judgment of the overload power PolT of phase T is omitted, and the power limit value PR2 is equal to the effective load power LR of phase R; the power limit value PS2 is equal to the effective load power LS of phase S; the power limit value PT2 is equal to the rated power Pn minus the effective load power of phase R rate LR minus S phase effective load power LS; if S phase overload power PolS is not less than power parameter value TMP6, and T phase overload power PolT is less than power parameter value TMP6, power limit value PR2 is equal to R phase effective load power LR; power limit value PS2 is equal to rated power Pn minus R phase effective load power LR minus T phase effective load power LT; power limit value PT2 is equal to T phase effective load power LT; if S phase overload power PolS is not less than power parameter value TMP6, and T phase overload power PolT is not less than power parameter value TMP6, power limit value PR2 is equal to R phase effective load power LR; power limit value PS2 is equal to 1 / 3*rated power Pn plus power parameter value TMP6; power limit value PT2 is equal to 1 / 3*rated power Pn plus power parameter value TMP6; power parameter value TMP6 is equal to the result of 1 / 3*rated power Pn minus R phase effective load power LR, multiplied by one half;The result of obtaining the power limit value of the current overload state through the second allocation mode, namely, the power limit value PR2, the power limit value PS2, and the power limit value PT2. ;

[0013] With the development of the field of new energy power generation, three-phase four-wire inverters that support three-phase unbalanced output have appeared in the industry. Such inverters can support different power outputs of three phases at the same time, which improves the flexibility of power output. The maximum power of each phase of such inverters is also one-third of the rated power of the inverter; three-phase inverters that support unbalanced output, when connected to the grid with single-phase load and the load is greater than one-third of the rated power, due to the maximum output power limit of each phase, the limit exceeding one-third of the rated power is provided by the power grid. At this time, since the other two phases have no load, the power cannot be output to the loaded phase, resulting in low power utilization. Since the other two phases have no load, the unused power can be considered to be added to the loaded phase. Usually, the hardware design considers that the rated power of each phase is one-third of the total power, and all power cannot be added to the same phase, but generally has a small overload output capacity. For example, a 10KW machine has a maximum output of 5KW per phase, but the total power of the three phases does not exceed 10KW.

[0014] The present application proposes a power dynamic allocation method for a three-phase inverter to improve the power utilization rate of a three-phase inverter supporting unbalanced power output. Specifically: first, the maximum power of each phase is dynamically allocated according to the load situation to meet the load demand to the greatest extent (allocation principle 1). Compared with the solution in which the maximum power of each phase is fixed at 1 / 3 of the rated power, the power utilization is improved; secondly, on the premise of meeting the allocation principle 1, the overload power of each phase is preferentially reduced (allocation principle 2), and the allocation result with the lowest single-phase overload power is selected to reduce the long-term overload of a certain phase; finally, after the above two allocation principles, the balance of the three-phase reverse output of the inverter is preferentially guaranteed (allocation principle 3). Allocation principles 2 and 3 can reduce the long-term power difference of each phase, which leads to differences in device life, so that the inverter can operate in a better working condition.

[0015] In summary, in overseas business, the application scenarios and demands of inverters are diverse. For example, a photovoltaic energy storage system deployed overseas is equipped with a three-phase inverter, and the power utilization rate of the inverter is not high, which not only affects the customer experience on the demand side, but also puts higher requirements on the after-sales work of R&D manufacturers. my country's three-phase inverters serve electricity users such as large factories (relatively stable loads, relatively balanced loads on each phase), and the inverter usually has a three-phase balanced output. However, in overseas markets, especially the European market, there is a mix of single-phase and three-phase loads in household power environments (or small commercial power environments of the same level). The loads of each phase in such application scenarios vary greatly. Occasional load increases and temporary load peaks force R&D personnel to use peak loads as a reference when designing inverter products. In order to cope with the temporary load peak of a certain phase, the overall power of the inverter is increased, which will affect the power utilization rate of the inverter. A strategy is needed that can effectively distribute the load according to the load conditions of each phase while keeping the overall inverter power unchanged. On the other hand, single-phase inverters are used in domestic household scenarios, and single-phase inverters do not have this power distribution problem. Based on this, the present application proposes a three-phase power dynamic distribution method and a three-phase inverter, which calculates the distribution results of lower overload power and higher power balance for each phase under the premise of meeting the maximum power utilization, which can significantly reduce the negative impact caused by long-term overload of a certain phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of a flow chart of a three-phase power dynamic allocation method provided in an embodiment of the present invention.

[0019] Figure 2 Another schematic diagram of the process of the three-phase power dynamic allocation method provided by the embodiment of the present invention.

[0020] Figure 3 A framework diagram of an energy storage system corresponding to the three-phase inverter provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or other features, integers, steps, operations, elements, components and / or combinations thereof.

[0023] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0024] It should be further understood that the term "and / or" used in the present description and the appended claims refers to one or any combination and all possible combinations of the associated listed items, and includes these combinations.

[0025] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0026] In this specification and the attached claims, there may be multiple ways of expressing the same technical feature or professional term, such as adopting different forms of expression such as superordinate generalization, subordinate limitation or synonym replacement; those skilled in the art can clearly understand the substantially same technical meanings pointed to by different ways of expression based on their professional knowledge and in combination with the overall content of the specification and the drawings; the differences between different ways of expression are only reflected in the diversity at the textual level, and do not constitute a substantial modification or limitation of the technical solution, and will not affect the certainty of the scope of protection of the claims of this patent and the full disclosure of the technical content of the specification.

[0027] Example See also Figures 1 to 3 ,in Figure 1 to Figure 2A flow chart of a three-phase power dynamic allocation method provided by an embodiment of the present invention. The embodiment of the present invention proposes a three-phase power dynamic allocation method, which is used for a control unit of a three-phase inverter, wherein each phase of the three-phase inverter includes an R phase, an S phase, and a T phase; in the following embodiments of the present application, the inverter power is positive for discharge and negative for charging; the meter power is positive for taking power from the power grid and negative for discharging to the power grid; the method includes: S1, obtaining the inverter power parameter value of each phase, obtaining the meter power parameter value of each phase, and obtaining the rated power parameter value of the inverter; S2, calculating the overload power of each phase according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, and then generating the overload state of each phase according to the overload power of each phase; S3, obtaining the power limit value of the current overload state according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase.

[0028] In one embodiment, the S3 obtains the power limit value of the current overload state according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase, including: S31, judging the sum of the effective load powers of each phase, and the relationship between the sum and the rated power parameter value; S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, obtaining the power limit value of the current overload state through the first allocation mode; S33, if the sum of the effective load powers of each phase is not less than the rated power parameter value, obtaining the power limit value of the current overload state through the second allocation mode.

[0029] In one embodiment, the S1, obtaining the inverter power parameter value of each phase, obtaining the meter power parameter value of each phase, and obtaining the rated power parameter value of the inverter, includes: obtaining the inverter power parameter value of each phase, the inverter power parameter value includes R-phase inverter power InvR, S-phase inverter power InvS, and T-phase inverter power InvT; obtaining the meter power parameter value of each phase, the meter power parameter value includes R-phase meter power MeterR, S-phase meter power MeterS, and T-phase meter power MeterT; obtaining the rated power parameter value of the inverter, the rated power parameter value is the rated power Pn.

[0030] In one embodiment, the rated power Pn multiplied by the coefficient K is equal to the limiting power, and the coefficient K is the preset maximum power coefficient of each phase; the inverter discharge power is defined as positive, and the meter power flowing from the grid side to the inverter side is positive. Based on the definition of the above direction, the effective load power is the inverter power plus the meter power, and the R-phase effective load power LR, the S-phase effective load power LS, and the T-phase effective load power LT are not less than zero; the R-phase effective load power LR is equal to the R-phase inverter power InvR plus the R-phase meter power MeterR and is not exceeds the limit power, the S phase effective load power LS is equal to the S phase inverter power InvS plus the S phase meter power MeterS and does not exceed the limit power, and the T phase effective load power LT is equal to the T phase inverter power InvT plus the T phase meter power MeterT and does not exceed the limit power; S2, according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculates the overload power of each phase, and then generates the overload state of each phase according to the overload power of each phase, including: according to the inverter power parameter value, the meter power parameter value , the rated power parameter value, calculate the overload power of the R phase, that is, the R phase overload power PolR is equal to the R phase inverter power InvR plus the R phase meter power MeterR minus 1 / 3*rated power Pn, and then judge that if the R phase overload power PolR is greater than zero, the R phase is overloaded, otherwise it is not overloaded, and then obtain the R phase judgment result; according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculate the overload power of the S phase, that is, the S phase overload power PolS is equal to the S phase inverter power InvS plus the S phase meter power Met erS minus 1 / 3*rated power Pn, then judge if the S phase overload power PolS is greater than zero, then the S phase is overloaded, otherwise it is not overloaded, and then obtain the S phase judgment result; according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculate the T phase overload power, that is, the T phase overload power PolT is equal to the T phase inverter power InvT plus the T phase meter power MeterT minus 1 / 3*rated power Pn, then judge if the T phase overload power PolT is greater than zero, then the T phase is overloaded, otherwise it is not overloaded, and then obtain the T phase judgment result. Among them, the coefficient K is the preset maximum power coefficient of each phase, and its value range is [1 / 3, 1], which can be understood by engineers in this field.

[0031] In one embodiment, the load connected to the three-phase inverter includes a single-phase load and a three-phase load; the S31, judging the sum of the effective load powers of each phase, and the relationship between the two compared with the rated power parameter value, comprises: calculating the sum of the R-phase effective load power LR plus the S-phase effective load power LS plus the T-phase effective load power LT, and comparing the sum with the rated power Pn, and obtaining a comparison result.

[0032] In one embodiment, S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, the power limit value of the current overload state is obtained through the first allocation mode, including: if the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is less than the rated power parameter value, the overload conditions of the R phase, the S phase and the T phase are judged; when all phases are not overloaded, the power limit value PR1 is equal to 1 / 3*rated power Pn; the power limit value PS1 is equal to 1 / 3*rated power Pn; the power limit value PT1 is equal to 1 / 3*rated power Pn; when the R phase is overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the effective load power of the R phase LR; the power limit value PS1 is equal to the S phase effective load power LS plus the power parameter value TMP1; the power limit value PT1 is equal to the T phase effective load power LT plus the power parameter value TMP1; when the S phase is overloaded and the other is not loaded, the power limit value PR1 is equal to the R phase effective load power LR plus the power parameter value TMP1; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the T phase effective load power LT plus the power parameter value TMP1; when the T phase is overloaded and the other is not loaded, the power limit value PR1 is equal to the R phase effective load power LR plus the power parameter value TMP1; the power limit value PS1 is equal to the S phase effective load power LS plus the power Parameter value TMP1; power limit value PT1 is equal to T phase effective load power LT; the power parameter value TMP1 is equal to the result of the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS minus the T phase effective load power LT, multiplied by one half; in the case where the R phase and the S phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the power parameter value TMP21; the power parameter value TMP21 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; in the case where the R phase and the T phase are overloaded and the other phases are not overloaded Under the condition, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the power parameter value TMP22; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP22 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; when the S phase and the T phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the power parameter value TMP23; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP23 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT;The result of obtaining the power limit value of the current overload state through the first allocation mode, namely, the power limit value PR1, the power limit value PS1, and the power limit value PT1. ;

[0033] In one embodiment, S33, if the sum of the effective load powers of each phase is not less than the rated power parameter value, the power limit value of the current overload state is obtained through the second allocation mode, including: if the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is not less than the rated power parameter value, the overload conditions of the R phase, the S phase and the T phase are judged; when all phases are overloaded, the power limit value PR2 is equal to 1 / 3*rated power Pn; the power limit value PS2 is equal to 1 / 3*rated power Pn; the power limit value PT2 is equal to 1 / 3*rated power Pn; when the R phase is overloaded and the other phases are not overloaded, the power limit value PR2 is equal to the power parameter value TMP31; the power limit value P S2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP31 is equal to the result of subtracting the S phase effective load power LS from the T phase effective load power LT from the rated power Pn; when the S phase is overloaded and the other parts are not loaded, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the power parameter value TMP32; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP32 is equal to the result of subtracting the effective load power LoadR from the effective load power LoadT from the rated power Pn; when the T phase is overloaded and the other parts are not loaded, the power limit value PR2 is equal to the R phase effective load power LR; the power The limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the power parameter value TMP33; the power parameter value TMP33 is equal to the result of the rated power Pn minus the effective load power LoadR minus the effective load power LoadS; when the R phase and S phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP4, the judgment of the S phase overload power PolS is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; the power limit value PT2 is equal to the T phase effective load power LT; if the R phase overload power PolR is not less than the power Parameter value TMP4, and the S phase overload power PolS is less than the power parameter value TMP4, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the T phase effective load power LT; if the R phase overload power PolR is not less than the power parameter value TMP4, and the S phase overload power PolS is not less than the power parameter value TMP4, the power limit value PR2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP4; the power limit value PS2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP4; the power limit value PT2 is equal to the T phase effective load power LT;The power parameter value TMP4 is equal to the result of 1 / 3*rated power Pn minus T phase effective load power LT, multiplied by one half; when the R phase and T phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP5, the judgment of the T phase overload power PolT is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; if the R phase overload power PolR is not less than the power parameter value TMP5, and the T phase overload power PolT is less than the power parameter value TMP5, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; the power limit value PS2 is equal to the S phase effective load power LS; The power limit value PT2 is equal to the effective load power LT of phase T; if the overload power PolR of phase R is not less than the power parameter value TMP5, and the overload power PolT of phase TMP5 is not less than the power parameter value TMP5, the power limit value PR2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power limit value PS2 is equal to the effective load power LS of phase S; the power limit value PT2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power parameter value TMP5 is equal to the result of subtracting the effective load power LS of phase S from the 1 / 3*rated power Pn, multiplied by one half; in the case of overload of phase S and phase T but not overload of other phases, if the overload power PolS of phase S is less than the power parameter value TMP6, the judgment of the overload power PolT of phase T is omitted, and the power limit value PR2 is equal to the effective load power LR of phase R; the power limit value PS2 is equal to the effective load power LS of phase S; the power limit value PT2 is equal to the rated power Pn minus the effective load power of phase R rate LR minus S phase effective load power LS; if S phase overload power PolS is not less than power parameter value TMP6, and T phase overload power PolT is less than power parameter value TMP6, power limit value PR2 is equal to R phase effective load power LR; power limit value PS2 is equal to rated power Pn minus R phase effective load power LR minus T phase effective load power LT; power limit value PT2 is equal to T phase effective load power LT; if S phase overload power PolS is not less than power parameter value TMP6, and T phase overload power PolT is not less than power parameter value TMP6, power limit value PR2 is equal to R phase effective load power LR; power limit value PS2 is equal to 1 / 3*rated power Pn plus power parameter value TMP6; power limit value PT2 is equal to 1 / 3*rated power Pn plus power parameter value TMP6; power parameter value TMP6 is equal to the result of 1 / 3*rated power Pn minus R phase effective load power LR, multiplied by one half;The result of obtaining the power limit value of the current overload state through the second allocation mode is power limit value PR2, power limit value PS2, and power limit value PT2. In the above scheme, similar to the values ​​of power limit value PR1 and power limit value PR2, there are changes, and other similar values ​​also have changes, and their specific reference relationships are known to engineers in this field. ;

[0034] In one embodiment, see Figure 3 The energy storage system framework diagram includes a three-phase inverter, and the loads connected to the three-phase inverter include single-phase loads and three-phase loads. The three-phase inverter is used to execute the three-phase power dynamic distribution method as described in any of the above embodiments. In summary, my country's household inverters need to be connected to single-phase outputs to adapt to the domestic household power environment. However, this design has limitations in the process of going overseas; the specific limitation is that my country's single-phase inverters do not have power distribution problems when serving households, nor will they lead to low efficiency due to power distribution. However, this problem may appear after my country's technical solutions go overseas, sometimes resulting in the inability to adapt, which in turn brings after-sales problems; my country's three-phase inverters serve electricity users such as large factories (with relatively stable loads), but in overseas markets, especially the European market, household power environments (or small commercial power environments of the same level) are not suitable for household power consumption. ), there is a situation where single-phase loads and three-phase loads are mixed and used, accidental load increases and temporary load peaks force R&D personnel to use peak loads as a reference when designing inverter products, which will affect the power utilization of the inverter; based on this, the present application proposes a three-phase power dynamic allocation method and a three-phase inverter, which allocate R-phase power limit value (power limit value PR), S-phase power limit value (power limit value PS), and T-phase power limit value (power limit value PT) under the premise of meeting the maximum power utilization, preferentially reducing the overload power of each phase, and can significantly reduce the negative impact caused by long-term overload of a certain phase.

[0035] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions, but such implementation should not be considered to be beyond the scope of the present invention.

[0036] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0037] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0038] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0039] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A three-phase power dynamic distribution method, characterized in that: A control unit for a three-phase inverter, wherein each phase of the three-phase inverter includes an R phase, an S phase, and a T phase, and the method comprises: S1, obtaining the inverter power parameter value of each phase, obtaining the meter power parameter value of each phase, and obtaining the rated power parameter value of the inverter; S2, calculating the overload power of each phase according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, and then generating the overload state of each phase according to the overload power of each phase; S3, obtaining a power limit value of a current overload state according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase.

2. The three-phase power dynamic distribution method according to claim 1, characterized in that: The S3, according to the inverter power parameter value of each phase, the rated power parameter value of the inverter, and the overload state of each phase, obtains the power limit value of the current overload state, including: S31, determining the magnitude relationship between the sum of the effective load powers of each phase and the rated power parameter value; S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, obtaining the power limit value of the current overload state through the first allocation mode; S33: If the sum of the effective load powers of the phases is not less than the rated power parameter value, the power limit value of the current overload state is obtained through the second allocation mode.

3. The three-phase power dynamic distribution method according to claim 1, characterized in that: The step S1, obtaining the inverter power parameter value of each phase, obtaining the meter power parameter value of each phase, and obtaining the rated power parameter value of the inverter, includes: Obtaining an inverter power parameter value of each phase, wherein the inverter power parameter value includes an R-phase inverter power InvR, an S-phase inverter power InvS, and a T-phase inverter power InvT; Obtaining a meter power parameter value of each phase, wherein the meter power parameter value includes an R-phase meter power MeterR, an S-phase meter power MeterS, and a T-phase meter power MeterT; A rated power parameter value of the inverter is obtained, where the rated power parameter value is the rated power Pn.

4. The three-phase power dynamic distribution method according to claim 3, characterized in that: The rated power Pn multiplied by the coefficient K is equal to the limiting power, and the coefficient K is the preset maximum power coefficient of each phase; the R phase effective load power LR is equal to the R phase inverter power InvR plus the R phase meter power MeterR and does not exceed the limiting power, the S phase effective load power LS is equal to the S phase inverter power InvS plus the S phase meter power MeterS and does not exceed the limiting power, and the T phase effective load power LT is equal to the T phase inverter power InvT plus the T phase meter power MeterT and does not exceed the limiting power; the S2, according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, calculates the overload power of each phase, and then generates the overload state of each phase according to the overload power of each phase, including: According to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, the overload power of the R phase is calculated, that is, the R phase overload power PolR is equal to the R phase inverter power InvR plus the R phase meter power MeterR minus 1 / 3*rated power Pn. Then, if the R phase overload power PolR is greater than zero, the R phase is overloaded, otherwise it is not overloaded, and then the R phase judgment result is obtained; According to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, the overload power of the S phase is calculated, that is, the S phase overload power PolS is equal to the S phase inverter power InvS plus the S phase meter power MeterS minus 1 / 3*rated power Pn. Then, if the S phase overload power PolS is greater than zero, the S phase is overloaded, otherwise it is not overloaded, and then the S phase judgment result is obtained; The overload power of phase T is calculated according to the inverter power parameter value, the meter power parameter value, and the rated power parameter value, that is, the overload power of phase T PolT is equal to the inverter power InvT of phase T plus the meter power MeterT of phase T minus 1 / 3*rated power Pn. Then, if the overload power PolT of phase T is greater than zero, then phase T is overloaded, otherwise it is not overloaded, thereby obtaining the judgment result of phase T.

5. The three-phase power dynamic distribution method according to claim 4, characterized in that: The load connected to the three-phase inverter includes a single-phase load and a three-phase load; the S31, determining the sum of the effective load powers of each phase, and comparing the sum with the rated power parameter value, the magnitude relationship between the two includes: The sum of the R phase effective load power LR plus the S phase effective load power LS plus the T phase effective load power LT is calculated, and compared with the rated power Pn, the magnitude relationship between the two is obtained to obtain a comparison result.

6. The three-phase power dynamic distribution method according to claim 5, characterized in that: The S32, if the sum of the effective load powers of each phase is less than the rated power parameter value, obtaining the power limit value of the current overload state through the first allocation mode, includes: If the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is less than the rated power parameter value, the overload condition of the R phase, the S phase and the T phase is determined; when each phase is not overloaded, the power limit value PR1 is equal to 1 / 3*rated power Pn; the power limit value PS1 is equal to 1 / 3*rated power Pn; the power limit value PT1 is equal to 1 / 3*rated power Pn; When the R phase is overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the S phase effective load power LS plus the power parameter value TMP1; the power limit value PT1 is equal to the T phase effective load power LT plus the power parameter value TMP1; when the S phase is overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR plus the power parameter value TMP1; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the T phase effective load power LT plus the power parameter value TMP1; when the T phase is overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR plus the power parameter value TMP1; the power limit value PS1 is equal to the S phase effective load power LS plus the power parameter value TMP1; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP1 is equal to the result of the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS minus the T phase effective load power LT, multiplied by one half; When the R phase and the S phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the power parameter value TMP21; the power parameter value TMP21 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; When the R phase and the T phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the R phase effective load power LR; the power limit value PS1 is equal to the power parameter value TMP22; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP22 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; When the S phase and the T phase are overloaded and the other phases are not overloaded, the power limit value PR1 is equal to the power parameter value TMP23; the power limit value PS1 is equal to the S phase effective load power LS; the power limit value PT1 is equal to the T phase effective load power LT; the power parameter value TMP23 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; The power limit value results of the current overload state are obtained through the first allocation mode, namely, the power limit value PR1, the power limit value PS1, and the power limit value PT1.

7. The three-phase power dynamic distribution method according to claim 6, characterized in that: The step S33, if the sum of the effective load powers of each phase is not less than the rated power parameter value, obtaining the power limit value of the current overload state through the second allocation mode, includes: If the sum of the effective load power LR of the R phase plus the effective load power LS of the S phase plus the effective load power LT of the T phase is not less than the rated power parameter value, the overload conditions of the R phase, the S phase and the T phase are judged; when all phases are overloaded, the power limit value PR2 is equal to 1 / 3*rated power Pn; the power limit value PS2 is equal to 1 / 3*rated power Pn; the power limit value PT2 is equal to 1 / 3*rated power Pn; When the R phase is overloaded and the others are not overloaded, the power limit value PR2 is equal to the power parameter value TMP31; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP31 is equal to the result of the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; When the S phase is overloaded and the others are not overloaded, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the power parameter value TMP32; the power limit value PT2 is equal to the T phase effective load power LT; the power parameter value TMP32 is equal to the result of the rated power Pn minus the effective load power LoadR minus the effective load power LoadT; When the T phase is overloaded and the others are not overloaded, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the power parameter value TMP33; the power parameter value TMP33 is equal to the result of the rated power Pn minus the effective load power LoadR minus the effective load power LoadS; When the R phase and S phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP4, the judgment of the S phase overload power PolS is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the rated power Pn minus the R phase effective load power LR minus the T phase effective load power LT; the power limit value PT2 is equal to the T phase effective load power LT; if the R phase overload power PolR is not less than the power parameter value TMP4, and the S phase overload power PolS is less than the power parameter value TMP4, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; power limit value PS2 is equal to S phase effective load power LS; power limit value PT2 is equal to T phase effective load power LT; if R phase overload power PolR is not less than power parameter value TMP4, and S phase overload power PolS is not less than power parameter value TMP4, power limit value PR2 is equal to 1 / 3*rated power Pn plus power parameter value TMP4; power limit value PS2 is equal to 1 / 3*rated power Pn plus power parameter value TMP4; power limit value PT2 is equal to T phase effective load power LT; power parameter value TMP4 is equal to the result of 1 / 3*rated power Pn minus T phase effective load power LT, multiplied by one half; In the case where the R phase and the T phase are overloaded and the other phases are not overloaded, if the R phase overload power PolR is less than the power parameter value TMP5, the judgment of the T phase overload power PolT is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; if the R phase overload power PolR is not less than the power parameter value TMP5, and the T phase overload power PolT is less than the power parameter value TMP5, the power limit value PR2 is equal to the rated power Pn minus the S phase effective load power LS minus the T phase effective load power LT; the power limit value PS2 is equal to the S phase effective load power LS; The power limit value PT2 is equal to the effective load power LT of the T phase; if the overload power PolR of the R phase is not less than the power parameter value TMP5, and the overload power PolT of the T phase is not less than the power parameter value TMP5, the power limit value PR2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power limit value PS2 is equal to the effective load power LS of the S phase; the power limit value PT2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP5; the power parameter value TMP5 is equal to the result of subtracting the effective load power LS of the S phase from 1 / 3*rated power Pn, multiplied by one half; When the S phase and the T phase are overloaded and the other phases are not overloaded, if the S phase overload power PolS is less than the power parameter value TMP6, the judgment of the T phase overload power PolT is omitted, and the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the S phase effective load power LS; the power limit value PT2 is equal to the rated power Pn minus the R phase effective load power LR minus the S phase effective load power LS; if the S phase overload power PolS is not less than the power parameter value TMP6, and the T phase overload power PolT is less than the power parameter value TMP6, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to the rated power P n minus the R phase effective load power LR minus the T phase effective load power LT; the power limit value PT2 is equal to the T phase effective load power LT; if the S phase overload power PolS is not less than the power parameter value TMP6, and the T phase overload power PolT is not less than the power parameter value TMP6, the power limit value PR2 is equal to the R phase effective load power LR; the power limit value PS2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP6; the power limit value PT2 is equal to 1 / 3*rated power Pn plus the power parameter value TMP6; the power parameter value TMP6 is equal to the result of 1 / 3*rated power Pn minus the R phase effective load power LR, multiplied by one half; The power limit value results of the current overload state are obtained through the second allocation mode, namely, the power limit value PR2, the power limit value PS2, and the power limit value PT2.

8. A three-phase inverter, characterized in that: The loads connected to the three-phase inverter include single-phase loads and three-phase loads, and the three-phase inverter is used to execute the three-phase power dynamic allocation method according to any one of claims 1 to 7.

Images