CN105184028B - A kind of single-phase full bridge power frequency inverter filtering device design method - Google Patents
A kind of single-phase full bridge power frequency inverter filtering device design method Download PDFInfo
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- CN105184028B CN105184028B CN201510719387.0A CN201510719387A CN105184028B CN 105184028 B CN105184028 B CN 105184028B CN 201510719387 A CN201510719387 A CN 201510719387A CN 105184028 B CN105184028 B CN 105184028B
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Abstract
The invention discloses a kind of single-phase full bridge power frequency inverter filtering device design methods, including recalling the maximum allowable output voltage of adjuster magnitude parameter in inverter design index；Then parameter is brought into filtering parameter formula to calculate；Simulation run single-phase full bridge power frequency inverter captures output voltage in the THD of stable state and load sudden change operating status；Compare THD and design objective THD obtained by step (3)；The former is less than the latter, and design is completed.Compared with prior art, the present invention can be directly realized by inverter load characteristic index, and the quantitative relation of filter parameter Yu inverter load characteristic parameter is clearly described, experiment shows that the load transient characteristic error of the realization of filtering parameter obtained by this method less than 5%, has the value of popularization and application.
Description
Technical Field
The invention relates to a circuit design method, in particular to a single-phase full-bridge power frequency inverter filter design method.
Background
The filter is an indispensable device of the power frequency inverter, and the filter and the square wave inverter circuit form the inverter, so that the purpose of filtering high-frequency components and retaining low-frequency components is realized, and finally, a low-frequency alternating current source is realized. The design of the filter is usually based on the filtering theory. The existing filter design technology cannot determine the quantity relation between the filter parameters and the transient characteristics of the load of the whole inverter, because the existing technology is based on the filtering theory, but not based on the transient characteristics of the load of the inverter circuit, a new design method is needed for birth.
Disclosure of Invention
The invention aims to solve the problems and provide a design method of a single-phase full-bridge power frequency inverter filter.
The invention realizes the purpose through the following technical scheme:
the invention comprises the following steps:
(1) calling out a maximum allowable output voltage drop parameter in the inverter design index;
(2) substituting the parameters in the step (1) into a filtering parameter formula for calculation;
(3) the method comprises the following steps of (1) carrying out simulation operation on a single-phase full-bridge power frequency inverter, and capturing the THD of output voltage in a steady state and a load sudden change operation state;
(4) comparing the THD obtained in the step (3) with a design index THD;
(5) in the step (4), the former is smaller than the latter, and the design is finished.
Specifically, the design index transient state adjustment time in the step (1) meets ts＝tsim，tsimFor maximum optimal load time, i.e.: t is tsim＝max{tsi＝f(Δio)|Δio＞0}。
The formula of the filtering parameter in the step (2) is as follows:
the invention has the beneficial effects that:
compared with the prior art, the method can directly realize the load characteristic index of the inverter and clearly describe the quantity relation between the filter parameter and the load characteristic parameter of the inverter, and experiments show that the error of the load transient characteristic realized by the filtering parameter obtained by the method is less than 5 percent, so that the method has popularization and application values.
Drawings
Fig. 1 is an experimental schematic diagram of the sliding mode control single-phase full-bridge power frequency inverter.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1: the invention comprises the following steps:
(1) calling out a maximum allowable output voltage drop parameter in the inverter design index;
(2) substituting the parameters in the step (1) into a filtering parameter formula for calculation;
(3) the method comprises the following steps of (1) carrying out simulation operation on a single-phase full-bridge power frequency inverter, and capturing the THD of output voltage in a steady state and a load sudden change operation state;
(4) comparing the THD obtained in the step (3) with a design index THD;
(5) in the step (4), the former is smaller than the latter, and the filter design is completed.
Specifically, the design index transient state adjustment time in the step (1) meets ts＝tsim，tsimFor maximum optimal load time, i.e.: t is tsim＝max{tsi＝f(Δio)|Δio＞0}。
The formula of the filtering parameter in the step (2) is as follows:
the filter designed according to the method can directly realize the load characteristic index of the inverter and clearly describe the quantity relation between the filter parameter and the load characteristic parameter of the inverter, and experiments show that the load transient characteristic error realized by the filter parameter obtained by the method is less than 5 percent (when the output voltage drop (overshoot) is less than 5 percent).
The experimental data are as follows:
TABLE 1 comparison of optimal loading characteristics formula with numerical simulation
Wherein,
as can be seen from table 1, when the output voltage drop rate caused by the load step loading is less than 5%, the deviation rate of the output voltage drop amount is less than 10% (9.665%), the optimal loading time deviation rate is less than 10% (6.05%), and the calculation result of the optimal load characteristic formula substantially matches the simulation result. When Δ ioWhen the voltage drop is more than or equal to 36A, the output voltage drop is higher than 5% of the peak voltage, and the optimal loading characteristic formula has larger deviation. On the contrary, ifThe maximum drop amount of the output voltage is restrained, and then the loading capacity of the inverter can be determined; if the maximum loading occurs between no load and full load, the power of the inverter can be determined.
TABLE 2 comparison of optimal load shedding characteristic formula with numerical simulation
Wherein,
as can be seen from table 2, the calculation result of the optimal load shedding characteristic formula is almost the same as the simulation experiment result, and the deviation is mainly caused by factors such as approximate analysis and simulation accuracy. The comprehensive analysis of the data in tables 1 and 2 shows that the shorter the transient process is, the more accurate the calculation result of the optimal transient characteristic formula is; the optimal load shedding transient characteristic value in table 2 is always smaller than that in table 1, and the performance of the inverter designed according to the loading requirement can meet the load shedding requirement certainly.
And (3) designing filtering parameters C and L of the single-phase full-bridge power frequency inverter by taking main design indexes as conditions and combining with the optimal loading characteristic. The main design indexes are as follows: (1) the input voltage is E, the amplitude of the output voltage is Uom, and the frequency is 50 Hz; (2) inverter power p (w); (3) a load regulation rate γ; (4) transient conditioning time ts(ii) a (5) The total harmonic distortion rate THD is less than or equal to 5 percent.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. A design method of a single-phase full-bridge power frequency inverter filter is characterized by comprising the following steps:
(1) calling out a maximum allowable output voltage drop parameter in the inverter design index; designing filtering parameters C and L of the single-phase full-bridge power frequency inverter by taking main design indexes as conditions and combining with optimal loading characteristics; the main design indexes are as follows: the input voltage is E, the amplitude of the output voltage is Uom, and the frequency is 50 Hz; inverter power p (w); a load regulation rate γ; the transient conditioning time ts; the total harmonic distortion rate THD is less than or equal to 5 percent;
(2) substituting the parameters in the step (1) into a filtering parameter formula for calculation;
(3) the method comprises the following steps of (1) carrying out simulation operation on a single-phase full-bridge power frequency inverter, and capturing the THD of output voltage in a steady state and a load sudden change operation state;
(4) comparing the THD obtained in the step (3) with a design index THD;
(5) in the step (4), the former is smaller than the latter, and the design is finished;
the transient state adjustment time of the design index in the step (1) satisfies ts＝tsim，tsimThe optimal load time for maximum loading, namely: t is tsim＝max{tsi＝f(Δio)|Δio＞0}；
The formula of the filtering parameter in the step (2) is as follows:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105790558A (en) * | 2016-03-10 | 2016-07-20 | 成都信息工程大学 | Method for designing filtering parameter of switching power supply |
| CN105762837B (en) * | 2016-04-22 | 2018-06-08 | 成都信息工程大学 | A kind of method for choosing inverter sliding mode controller coefficient |
| CN106026750B (en) * | 2016-07-13 | 2018-10-26 | 成都信息工程大学 | A kind of design method of power frequency inverter |
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Non-Patent Citations (4)
| Title |
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| Buck 变换器最优负载瞬态特性分析;倪雨 等;《中国电机工程学报》;20100825;第30卷(第24期);第1、3节 |
| Control Topology Options for Single-Phase UPS Inverters;Michael J. Ryan 等;《IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS》;19970430;第33卷(第2期);第493-501页 |
| Model Predictive Control of an Inverter With Output LC Filter for UPS Applications;Patricio Cortés 等;《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》;20090630;第56卷(第6期);第1875-1883页 |
| 基于单极性倍频SPWM调制的逆变电源系统研究;李琛;《宁夏工程技术》;20090930;第8卷(第3期);第1-3节 |
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