CN113315138A - Method and system for improving efficiency of power converter - Google Patents
Method and system for improving efficiency of power converter Download PDFInfo
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- CN113315138A CN113315138A CN202110488797.4A CN202110488797A CN113315138A CN 113315138 A CN113315138 A CN 113315138A CN 202110488797 A CN202110488797 A CN 202110488797A CN 113315138 A CN113315138 A CN 113315138A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004891 communication Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000001965 increasing effect Effects 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention belongs to the technical field of power converters, and particularly relates to a method and a system for improving the efficiency of a power converter, wherein the power converter system comprises a controller and a controller, wherein the controller is used for controlling the power converter and is connected to the power converter through a communication link, the communication link is used for providing connection between the controller and the power converter, and the power converter comprises a capacitance compensation device; according to the scheme, the invention reduces the total current in the line and the capacity of the power converter by improving the power factor, thereby not only reducing the investment cost, but also reducing the loss of the electric energy per se; by ensuring good power factor value, the voltage loss in the power converter is reduced, the load voltage is more stable, and the power quality is improved.
Description
Technical Field
The present invention relates to power converters, and more particularly, to a method and system for improving efficiency of a power converter.
Background
With the continuous research and development of high and new technologies, various devices have been advanced, and as a backup army, a power circuit has a relatively obvious progress, specifically, taking a typical mobile phone as an example, besides an original call function, various functions such as a camera, a broadcast, a television and the like have become common standard functions, and voltages required for the operation of the functions are different from each other, for this reason, the battery voltage must be converted into the voltage required for the normal operation of each circuit through a power conversion circuit, and a switch controller with high power conversion efficiency is mostly adopted; in addition, in the process of multi-functionalization of mobile devices, demands for miniaturization and thinning of devices have been increasing, and for this purpose, it is necessary to reduce the number of components used or to make the components smaller, and this is a measure to reduce the required rated parameter values of power inductance and capacitance by increasing the switching frequency of the DC-DC converter, thereby adapting to miniaturization of the components, and in such a case, the switching frequency of the PMIC that centrally controls the power supply is changed from 1MHz, which is always used, to 3MHz, and the main frequency of the DC-DC converter IC that manages the individual power supply is always 3 to 4MHz, and in this case, the power inductance as the main component requires a low inductance product of 1.0uH to 2.2uH, and the increase in the number of switching frequencies necessitates noise, and development of the power inductance has been promoted in order to solve these problems.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method and a system for improving efficiency of a power converter, which aims to change power factor of the power converter, reduce loss of reactive power, and improve efficiency of the power converter.
The technical scheme adopted by the invention is as follows:
methods and systems for improving the efficiency of a power converter, the power converter system including a controller for controlling the power converter, the controller being connected to the power converter by a communication link for providing a connection between the controller and the power converter; the work converter includes the addition of a capacitance compensation device.
The method of the power converter comprises the following steps:
step 1, improving the quality of electric energy
Wherein, the voltage loss of the load (P + JQ) is Delta U
△U＝(PR+QX)/U (1)
In the formula, U is the rated voltage (kv) of the line, P is the transmitted active power (kw), Q is the transmitted reactive power (kvar), R is the line resistance (Ω), X is the line reactance (Ω), and after the capacitance compensation device capacity Qc is installed, the voltage drop of the circuit is Δ U1, which is calculated as follows:
△U1＝＊PR+(Q-Qc)X]/U (2)
obviously, Δ U1 < [ delta ] U, i.e. the voltage loss after compensation capacitance is reduced, and the voltage rise after the reactive compensation capacity Qc is accessed can be calculated as follows according to equations (1) and (2):
△U-△U1＝QcX/U (3)
since the reactance X of the line is greater closer to the end of the line, it can be seen from equation (3) that installing the capacitance compensation device closer to the end of the line is more effective.
Step 2, reducing electric energy loss
If the transmitted active power P is a constant value, the power factor is controlled by the installed capacitance compensation equipment
Is improved to
Because of the fact that
Load current I and
inversely proportional, and since P ═ I2R, the real loss of the line is proportional to the square of the current I, when
When the load current I is increased and reduced, namely the current I is reduced, the active loss of the line is reduced by times, and conversely, when the power factor of the load is reduced from 1 to
The percentage by which power loss in the grid element will increase is Δ PL%, calculated as follows:
step 3, improving the active power of the power converter
Under the condition that the capacity of the power converter is not changed, because the power factor is improved, less reactive power can be sent, more active power can be sent, and the more active power Delta P can be calculated as follows:
if the required active power is not changed, the required reactive power is reduced, so the required distribution capacity is also reduced by Δ S as follows:
the percentage of the capacity of the power converter to the original capacity can be reduced as Δ S/S, and the calculation is as follows:
after the system adopts the capacitance compensation equipment, the reactive load is reduced, and the generator can generate less reactive power and more active power.
Preferably, the capacitance compensation device adopts a compensation mode that:
the grouping compensation mode is that the capacitor is arranged on a high-voltage or low-voltage bus at the tail end of the detection line;
in a centralized compensation mode, the capacitor is arranged on a bus of 6-10 v of the detection circuit, so that the reactive power of the power converter is basically balanced within a power supply range, and the reactive loss of a high-voltage line can be reduced;
the compensation method is characterized in that a capacitor is arranged near an asynchronous motor or inductive electric equipment, and reactive power compensation is carried out locally, so that the power factor of a power supply loop of the electric equipment can be improved.
According to the scheme, the invention has the following beneficial effects:
1. by improving the power factor, the total current in the circuit and the capacity of the power converter are reduced, so that the investment cost is reduced, and the loss of the electric energy per se is reduced;
2. by ensuring good power factor value, the voltage loss in the power converter is reduced, the load voltage is more stable, and the electric energy quality is improved;
3. after the capacitance compensation equipment is installed, the power factor can be improved, and the capacity of a load can be increased.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the embodiment will be briefly described below.
FIG. 1 is a schematic current diagram of the present invention before power factor improvement;
fig. 2 is a schematic diagram of the current after the power factor is improved according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout, and the embodiments described below with reference to the drawings are exemplary only and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements can be directly connected or indirectly connected through an intermediate medium, and the two elements can be communicated with each other, so that the specific meaning of the terms in the invention can be understood by those skilled in the art.
Methods and systems for improving the efficiency of a power converter, the power converter system including a controller for controlling the power converter, the controller being connected to the power converter by a communication link for providing a connection between the controller and the power converter; the work converter includes the addition of a capacitance compensation device.
The method of the power converter comprises the following steps:
step 1, improving the quality of electric energy
Wherein, the voltage loss of the load (P + JQ) is Delta U
△U＝(PR+QX)/U (1)
In the formula, U is the rated voltage (kv) of the line, P is the transmitted active power (kw), Q is the transmitted reactive power (kvar), R is the line resistance (Ω), X is the line reactance (Ω), and after the capacitance compensation device capacity Qc is installed, the voltage drop of the circuit is Δ U1, which is calculated as follows:
△U1＝＊PR+(Q-Qc)X]/U (2)
obviously, Δ U1 < [ delta ] U, i.e. the voltage loss after compensation capacitance is reduced, and the voltage rise after the reactive compensation capacity Qc is accessed can be calculated as follows according to equations (1) and (2):
△U-△U1＝QcX/U (3)
since the reactance X of the line is greater closer to the end of the line, it can be seen from equation (3) that installing the capacitance compensation device closer to the end of the line is more effective.
Step 2, reducing electric energy loss
If the transmitted active power P is a constant value, the power factor is controlled by the installed capacitance compensation equipment
Is improved to
Because of the fact that
Load current I and
inversely proportional, and since P ═ I2R, the real loss of the line is proportional to the square of the current I, when
When the load current I is increased and reduced, namely the current I is reduced, the active loss of the line is reduced by times, and conversely, when the power factor of the load is reduced from 1 to
The percentage by which power loss in the grid element will increase is Δ PL%, calculated as follows:
step 3, improving the active power of the power converter
Under the condition that the capacity of the power converter is not changed, because the power factor is improved, less reactive power can be sent, more active power can be sent, and the more active power Delta P can be calculated as follows:
if the required active power is not changed, the required reactive power is reduced, so the required distribution capacity is also reduced by Δ S as follows:
the percentage of the capacity of the power converter to the original capacity can be reduced as Δ S/S, and the calculation is as follows:
after the system adopts the capacitance compensation equipment, the reactive load is reduced, and the generator can generate less reactive power and more active power.
The compensation method adopted by the capacitance compensation equipment is as follows:
the grouping compensation mode is that the capacitor is arranged on a high-voltage or low-voltage bus at the tail end of the line;
the centralized compensation mode is that the capacitor is arranged on a 6-10 v bus of the circuit, so that the reactive power of the power converter is basically balanced within the power supply range, and the reactive loss of a high-voltage line can be reduced;
the compensation method is characterized in that a capacitor is arranged near an asynchronous motor or inductive electric equipment, and reactive power compensation is carried out locally, so that the power factor of a power supply loop of the electric equipment can be improved.
Claims (6)
1. A method and system for improving the efficiency of a power converter, characterized by: the power converter system comprises a controller for controlling a power converter, said controller being connected to said power converter by a communication link for providing a connection between said controller and said power converter; the work converter includes the addition of a capacitance compensation device.
2. The method and system for improving power converter efficiency of claim 1, wherein: the method of the power converter comprises the following steps:
improving the quality of electric energy
Wherein, the voltage loss of the load (P + JQ) is Delta U
△U＝(PR+QX)/U (1)
In the formula, U is the rated voltage (kv) of the line, P is the transmitted active power (kw), Q is the transmitted reactive power (kvar), R is the line resistance (Ω), X is the line reactance (Ω), and after the capacitance compensation device capacity Qc is installed, the voltage drop of the circuit is Δ U1, which is calculated as follows:
△U1＝＊PR+(Q-Qc)X]/U (2)
obviously, Δ U1 < [ delta ] U, i.e. the voltage loss after compensation capacitance is reduced, and the voltage rise after the reactive compensation capacity Qc is accessed can be calculated as follows according to equations (1) and (2):
△U-△U1＝QcX/U (3)
since the reactance X of the line is greater closer to the end of the line, it can be seen from equation (3) that installing the capacitance compensation device closer to the end of the line is more effective.
3. The method and system for improving power converter efficiency of claim 1, wherein: reducing power consumption
If the transmitted active power P is a constant value, the power factor is controlled by the installed capacitance compensation equipment
Is improved to
Because of the fact that
Load current I and
inversely proportional, and since P ═ I2R, the real loss of the line is proportional to the square of the current I, when
When the load current I is increased and reduced, namely the current I is reduced, the active loss of the line is reduced by times, and conversely, when the power factor of the load is reduced from 1 to
The percentage by which power loss in the grid element will increase is Δ PL%, calculated as follows:
4. the method and system for improving power converter efficiency of claim 1, wherein: boosting active power of a power converter
Under the condition that the capacity of the power converter is not changed, because the power factor is improved, less reactive power can be sent, more active power can be sent, and the more active power Delta P can be calculated as follows:
5. the method and system for improving power converter efficiency of claim 1, wherein: reducing distribution capacity
If the required active power is not changed, the required reactive power is reduced, so the required distribution capacity is also reduced by Δ S as follows:
the percentage of the capacity of the power converter to the original capacity can be reduced as Δ S/S, and the calculation is as follows:
after the system adopts the capacitance compensation equipment, the reactive load is reduced, and the generator can generate less reactive power and more active power.
6. The method and system for improving power converter efficiency of claim 1, wherein: the capacitance compensation equipment adopts a compensation mode which comprises the following steps:
the grouping compensation mode is that the capacitor is arranged on a high-voltage or low-voltage bus at the tail end of the line;
the centralized compensation mode is that the capacitor is arranged on a 6-10 v bus of the circuit, so that the reactive power of the power converter is basically balanced within the power supply range, and the reactive loss of a high-voltage line can be reduced;
the compensation method is characterized in that a capacitor is arranged near an asynchronous motor or inductive electric equipment, and reactive power compensation is carried out locally, so that the power factor of a power supply loop of the electric equipment can be improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110488797.4A CN113315138A (en) | 2021-04-30 | 2021-04-30 | Method and system for improving efficiency of power converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110488797.4A CN113315138A (en) | 2021-04-30 | 2021-04-30 | Method and system for improving efficiency of power converter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201234140Y (en) * | 2008-07-25 | 2009-05-06 | 宝鸡同步电器有限公司 | Non-surge low voltage reactive compensator |
| CN202737474U (en) * | 2012-08-10 | 2013-02-13 | 浙江永泰隆电子有限公司 | Three-phase intelligent reactive compensation detection device |
| CN202817774U (en) * | 2012-09-24 | 2013-03-20 | 宋长虹 | Low voltage power network reactive compensation telecontrol system |
| CN108599182A (en) * | 2018-04-13 | 2018-09-28 | 广西配网电力技术有限公司 | A kind of reactive power compensator and its compensating control method |
| CN110943461A (en) * | 2019-11-25 | 2020-03-31 | 国网辽宁省电力有限公司本溪供电公司 | Intelligent integrated power distribution device applied to low-voltage transformer area and method thereof |
-
2021
- 2021-04-30 CN CN202110488797.4A patent/CN113315138A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201234140Y (en) * | 2008-07-25 | 2009-05-06 | 宝鸡同步电器有限公司 | Non-surge low voltage reactive compensator |
| CN202737474U (en) * | 2012-08-10 | 2013-02-13 | 浙江永泰隆电子有限公司 | Three-phase intelligent reactive compensation detection device |
| CN202817774U (en) * | 2012-09-24 | 2013-03-20 | 宋长虹 | Low voltage power network reactive compensation telecontrol system |
| CN108599182A (en) * | 2018-04-13 | 2018-09-28 | 广西配网电力技术有限公司 | A kind of reactive power compensator and its compensating control method |
| CN110943461A (en) * | 2019-11-25 | 2020-03-31 | 国网辽宁省电力有限公司本溪供电公司 | Intelligent integrated power distribution device applied to low-voltage transformer area and method thereof |
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