CN112187083A - Power loss calculation method of three-level wind power converter - Google Patents

Power loss calculation method of three-level wind power converter Download PDF

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CN112187083A
CN112187083A CN202010864772.5A CN202010864772A CN112187083A CN 112187083 A CN112187083 A CN 112187083A CN 202010864772 A CN202010864772 A CN 202010864772A CN 112187083 A CN112187083 A CN 112187083A
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loss
switching
alpha
losses
turn
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CN112187083B (en
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屈鲁
唐博进
曾嵘
郭明珠
余占清
翟冬玲
崔彬
赵彪
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Tsinghua University
China Three Gorges Corp
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China Three Gorges Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The invention provides a power loss calculation method of a three-level wind power converter, which comprises the following steps: determining the relation between the conduction angle and the duty ratio of the switching tubes T1, T2 and T5 and the diodes D1, D2 and D5 under a modulation strategy; calculating the turn-on loss, the turn-off loss and the on-state loss of the switching tubes T1, T2 and T5 according to the turn-on angle and the duty ratio; and calculating the turn-off loss and the turn-on loss of the diodes D1, D2 and D5 according to the turn-on angle and the duty ratio. The invention provides a method for calculating the turn-on loss, the turn-off loss and the on-state loss of a switching tube and a method for calculating the turn-off loss and the on-state loss of a diode, starts from a model of the turn-on loss, the turn-off loss and the turn-on loss of a power device, and comprehensively considers the influence of a modulation strategy on the loss calculation of a wind power converter.

Description

Power loss calculation method of three-level wind power converter
Technical Field
The invention belongs to the field of power devices, and particularly relates to a power loss calculation method of a three-level wind power converter.
Background
The power loss of the switching device is a main heating source in the main circuit of the converter, and excessive loss of the switching device can cause the temperature rise of the device, the performance reduction of the system and even the failure of the frequency converter. The estimation of the losses of the switching devices is very important and is extremely necessary for the design of the converter circuit, the mechanical structure and the cooling system. However, the estimation is also very complex, and has a certain relation with the switching device characteristics of the converter, the circuit topology, the PWM (pulse width modulation) mode, the absorption circuit and the circuit stray inductance. In the conventional art, the switching device loss is calculated by averaging effect over a long period of time. The average value calculated according to the average effect can only be obtained by adopting several simple ways to ensure the temperature rise of the switching device, for example, simultaneously turning on and off the absorption circuit and designing the main parameters of the absorption circuit to be large enough, and these several schemes convert the power loss of the switching device into the loss of the absorption circuit at a large cost. Or the cooling effect of the cooling system of the converter can be enhanced, and some converters capable of air cooling are designed into water-cooling converters, but the measures increase the cost of the converter to a certain extent and reduce the efficiency of the converter. It is the inaccuracy of the power loss estimation of the switching device that brings difficulties to the design and optimization of the whole system of the converter.
Disclosure of Invention
Aiming at the problems, the invention provides a power loss calculation method of a three-level wind power converter.
The invention provides a power loss calculation method of a three-level wind power converter, wherein a single-phase bridge arm of the three-level wind power converter comprises switching tubes T1-T6, diodes D1-D6 and capacitors Cd1 and Cd2, each switching tube Ti in the switching tubes T1-T6 is connected with a corresponding diode Di in an anti-parallel mode, i is an integer and is not less than 1 and not more than 6, namely a collector or an anode of each switching tube Ti is connected to a cathode of the corresponding diode Di, an emitter or a cathode of each switching tube Ti is connected to an anode of the corresponding diode Di, and the switching tubes T1-T4 are sequentially connected in series, namely an emitter or a cathode of a previous switching tube is connected to a collector or an anode of a next switching tube; the positive electrode of the capacitor Cd1 is connected to the collector or anode of the switch tube T1, and the negative electrode of the capacitor Cd1 is connected to the positive electrode of the capacitor Cd2 and the emitter or cathode of the switch tube T5; the negative electrode of the capacitor Cd2 is connected to the emitter or the cathode of the switch tube T4; the collector or anode of the switch tube T5 is connected to the emitter or cathode of the switch tube T1, the emitter or cathode of the switch tube T5 is connected to the collector or anode of the switch tube T6; the emitter or cathode of the switch tube T6 is connected to the collector or anode of the switch tube T4,
the power device loss calculation method comprises the following steps:
determining the relation between the conduction angles and the duty ratios of the switching tubes T1, T2 and T5 and the diodes D1, D2 and D5;
calculating the turn-on loss, the turn-off loss and the on-state loss of the switching tubes T1, T2 and T5 according to the turn-on angle and the duty ratio;
and calculating the turn-off loss and the turn-on loss of the diodes D1, D2 and D5 according to the turn-on angle and the duty ratio.
Further, in the present invention,
let alpha denote the power factor angle, M be the modulation degree, then
When the conduction angle of the switch tube T1 is in an interval [0, pi-alpha ], the duty ratio is Msin (wt + alpha);
when the conduction angle of the diode D1 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is Msin (wt + alpha);
when the conduction angle of the switching tube T2 is in an interval [0, pi ], the duty ratio is (1+ Msin (wt + alpha))/2;
when the conduction angle of the diode D2 is in an interval [ pi, 2 pi-alpha ], the duty ratio is (1+ Msin (wt + alpha))/2;
when the conduction angle of the diode D2 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is (1+ Msin (wt + alpha))/2;
when the conduction angle of the switching tube T5 is in an interval [ pi, 2 pi-alpha ], the duty ratio is (1+ Msin (wt + alpha))/2;
when the conduction angle of the switching tube T5 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is (1-Msin (wt + alpha))/2;
when the conduction angle of the diode D5 is in an interval [0, pi-alpha ], the duty ratio is (1-Msin (wt + alpha))/2;
when the conduction angle of the diode D5 is in the interval [ pi-alpha, pi ], the duty ratio is (1+ Msin (wt + alpha))/2.
Further, in the present invention,
the switching tubes T1, T2 and T5 have switching losses of
Figure BDA0002649368410000031
Wherein,
Ipand UmThe amplitudes of the current I and the voltage U of the single-phase bridge arm respectively, w is the frequency of the current I and the voltage U, t represents time, fswFor the switching frequency of the device to be,
Figure BDA0002649368410000032
k1is a correction coefficient, Q, introduced according to the relationship between the switching condition and the standard test condition when the IGCT is switched onon0Is a single pulse of switching-on energy, Vd0And iL0Is a target in a data manualQuasi-test conditions;
the turn-off losses of the switching tubes T1, T2 and T5 are
Figure BDA0002649368410000041
Wherein,
Figure BDA0002649368410000042
k2is a correction coefficient, Q, introduced according to the relation between the switching condition and the standard test condition when the switching tube is turned offoff0The energy is turned off for a single pulse;
the on-state losses of the switching tubes T1, T2 and T5 are
Figure BDA0002649368410000043
Wherein,
VT0is a threshold voltage rTIs a slope resistance.
Further, in the present invention,
the diodes D1, D2 and D5 have turn-off losses of
Figure BDA0002649368410000044
Wherein,
Figure BDA0002649368410000045
k3the correction coefficient is introduced according to the relation between the switching condition and the standard test condition when the diode is turned off;
the on-state losses of the diodes D1, D2 and D5 are
Figure BDA0002649368410000046
Further, in the present invention,
the loss of the switching tube T1 includes:
switching losses
Figure BDA0002649368410000051
Loss of on state
Figure BDA0002649368410000052
Further, in the present invention,
the loss of the switching tube T2 includes:
switching losses
Figure BDA0002649368410000053
Loss of on state
Figure BDA0002649368410000054
Further, in the present invention,
the losses of the switching tube T5 include:
switching losses
Figure BDA0002649368410000055
Loss of on state
Figure BDA0002649368410000056
Further, in the present invention,
the losses of the diode D1 include:
switching losses
Figure BDA0002649368410000057
Loss of on state
Figure BDA0002649368410000058
Further, in the present invention,
the losses of the diode D2 include:
switching losses
Figure BDA0002649368410000059
Loss of on state
Figure BDA00026493684100000510
Further, in the present invention,
the losses of the diode D5 include:
switching losses
Figure BDA0002649368410000061
Loss of on state
Figure BDA0002649368410000062
The invention provides a method for calculating the turn-on loss, the turn-off loss and the on-state loss of a switching tube and a method for calculating the turn-off loss and the on-state loss of a diode, starts from a model of the turn-on loss, the turn-off loss and the turn-on loss of a power device, and comprehensively considers the influence of a modulation strategy on loss calculation.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows an ANPC (Active-neutral-point-clamped) three-level single-phase bridge arm structure using the power loss calculation method of the present invention;
fig. 2 shows a schematic diagram of voltage and current relationships during a modulation period according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a structure diagram of an ANPC three-level single-phase bridge arm of a three-level wind power converter. As can be seen from FIG. 1, the single-phase bridge arm includes switching tubes T1-T6, diodes D1-D6, and capacitors Cd1 and Cd 2. The switching tubes T1-T6 are all fully-controlled power electronic devices such as IGCT (integrated gate commutated thyristor). And each switching tube Ti (i is an integer and is not less than 1 and not more than 6) is IGCT, and in the ANPC three-level single-phase bridge arm, each switching tube Ti is connected with the corresponding diode Di in inverse parallel, namely the anode of the switching tube Ti is connected to the cathode of the diode Di, and the cathode of the switching tube Ti is connected to the anode of the diode Di. The switch tubes T1-T4 are sequentially connected in series, namely the cathode of the previous switch tube is connected to the anode of the next switch tube; the anode of the capacitor Cd1 is connected to the anode of the switch tube T1, and the cathode of the capacitor Cd1 is connected to the anode of the capacitor Cd2 and the cathode of the switch tube T5; the negative electrode of the capacitor Cd2 is connected to the cathode of the switch tube T4; the anode of the switch tube T5 is connected to the cathode of the switch tube T1, and the cathode of the switch tube T5 is connected to the anode of the switch tube T6; the cathode of the switching tube T6 is connected to the anode of the switching tube T4. The fully-controlled power electronic device may also be an IGBT (insulated gate bipolar transistor) or an IEGT (injection enhancement gate transistor), and when the switch is an IGBT or an IEGT, the anode of the switch in fig. 1 should be a collector, and the cathode of the switch in fig. 1 should be an emitter. The switching tubes T5 and T6 are clamping switching tubes, and when the T5 and T6 are turned off all the time and only the anti-parallel diodes thereof are used, the single-phase bridge arm is in a Neutral Point Clamped (NPC) mode; when T5 and T6 are also involved in modulation, the single phase leg is in active neutral point clamped ANPC mode.
The invention provides a power loss calculation method under different switching states of the three-level single-phase bridge arm by taking the power loss of an IGCT, an anti-parallel diode and a clamping diode in the ANPC three-level single-phase bridge arm as an object and according to the characteristics of a switching device.
The loss calculation needs to consider the behavior of each power device in one modulation cycle as shown in fig. 2, where α represents the power factor angle. And dividing a modulation period into four regions according to the zero crossing point conditions of the current and the voltage of the single-phase bridge arm. And when the single-phase bridge arm current is a sine waveform, a power factor angle exists in the voltage sine waveform, and the single-phase bridge arm current I and the voltage U are expressed as the following formulas (1) and (2).
I＝Ipsin(wt) (1)
U＝Umsin(wt+α) (2)
Wherein, IpAnd UmThe amplitudes of the current I and the voltage U, w the frequencies of the current I and the voltage U, and t the time.
According to the symmetry of the upper and lower bridge arms of the ANPC converter, and by taking the power devices of the above bridge arms as an example for analysis, it can be known that the relationship between the conduction angle and the duty ratio of each switching device in the ANPC converter is shown in table 1, where M represents the modulation degree.
TABLE 1 conduction angle and Duty ratio of each switching device in ANPC converter
Switching device Conduction angle Duty cycle
T1 [0，π-α] Msin(wt+α)
D1 [2π-α，2π] Msin(wt+α)
T2 [0，π] (1+Msin(wt+α))/2
D2 [π，2π-α] (1+Msin(wt+α))/2
D2 [2π-α，2π] (1+Msin(wt+α))/2
T5 [π，2π-α] (1+Msin(wt+α))/2
T5 [2π-α，2π] (1-Msin(wt+α))/2
D5 [0，π-α] (1-Msin(wt+α))/2
D5 [π-α，π] (1+Msin(wt+α))/2
The switching and conduction losses of the power devices of the upper arm (including switching transistors T1, T2, T5 and diodes D1, D2, D5) are calculated below.
(1) IGCT turn-on loss
IGCT device has turn-on loss of
Figure BDA0002649368410000091
Wherein f isswFor the switching frequency of the device to be,
Figure BDA0002649368410000092
k1is a correction coefficient, Q, introduced according to the relationship between the switching condition and the standard test condition when the IGCT is switched onon0Is a single pulse of turn-on energy which can be set to 1.8J, Vd0And iL0Are standard test conditions in data sheets.
(2) IGCT turn-off loss
IGCT device turn-off loss of
Figure BDA0002649368410000093
Wherein,
Figure BDA0002649368410000094
k2is a correction coefficient, Q, introduced according to the relationship between the switching condition and the standard test condition when the IGCT is turned offoff0The energy is turned off for a single pulse.
(3) Diode turn-off loss
The diode only takes into account the turn-off losses of a diode of
Figure BDA0002649368410000095
Wherein,
Figure BDA0002649368410000096
k3the correction coefficient is introduced according to the relation between the switching condition and the standard test condition when the diode is turned off.
(4) IGCT on-state loss
IGCT on-state losses of
Figure BDA0002649368410000101
Wherein, VT0Is a threshold voltage rTThe threshold voltage and the slope resistance satisfy the on-state peak voltage V of the IGCT obtained by fitting the V-I curve of the IGCTT＝VT0+i·rT。
(5) Diode on-state loss
Diode on-state loss of
Figure BDA0002649368410000102
The system switching losses of the ANPC three-level single-phase bridge arm are calculated below.
The system switching loss of the ANPC three-level converter is related to a modulation strategy of the converter, and the system switching loss is calculated according to a carrier phase shift modulation strategy.
In the carrier phase shift PWM, the switching frequencies of the three switching devices T1, T2, and T5 are completely equal. The phase difference between the two carriers is 180 degrees, and the two carriers respectively correspond to the inner tube fundamental frequency modulation and the outer tube fundamental frequency modulation, and can also be considered to respectively correspond to the on/off of the switching tubes T1 and T2. The relationship between the conduction angle and the duty ratio of each power electronic device in the ANPC converter in the carrier phase shift mode is shown in table 2, where M represents the modulation degree.
(11) Loss of switching tube T1
The losses of the switching tube T1 include:
switching losses
Figure BDA0002649368410000103
Loss of on state
Figure BDA0002649368410000104
(22) Loss of diode D1
The losses of diode D1 include:
switching losses
Figure BDA0002649368410000111
Loss of on state
Figure BDA0002649368410000112
(33) Loss of switching tube T2
The losses of the switching tube T2 include:
switching losses
Figure BDA0002649368410000113
Loss of on state
Figure BDA0002649368410000114
(44) Loss of diode D2
The losses of diode D2 include:
switching losses
Figure BDA0002649368410000115
Loss of on state
Figure BDA0002649368410000116
(55) Loss of switching tube T5
The losses of the switching tube T5 include:
switching losses
Figure BDA0002649368410000117
Loss of on state
Figure BDA0002649368410000118
(66) Loss of diode D5
The losses of diode D5 include:
switching losses
Figure BDA0002649368410000119
Loss of on state
Figure BDA00026493684100001110
The switch tube in the above embodiments may also be an IGBT or an IEGT. Switching losses and conduction losses of the switching tubes T3, T4 and T6 and the diodes D3, D4 and D6 can be obtained according to symmetry of upper and lower bridge arms of the ANPC converter.
In summary, the power loss calculation method of the three-level wind power converter provided by the invention provides a method for calculating the turn-on loss, turn-off loss and turn-on loss of the switching tube and a method for calculating the turn-off loss and turn-on loss of the diode, starts from the turn-on loss, turn-off loss and turn-on loss model of the power device, and comprehensively considers the influence of the modulation strategy on loss calculation.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A power loss calculation method of a three-level wind power converter is characterized in that a single-phase bridge arm of the three-level wind power converter comprises switching tubes T1-T6, diodes D1-D6 and capacitors Cd1 and Cd2, each switching tube Ti in the switching tubes T1-T6 is connected with a corresponding diode Di in an anti-parallel mode, i is an integer and is not less than 1 and not more than 6, namely a collector or an anode of each switching tube Ti is connected to a cathode of the corresponding diode Di, an emitter or a cathode of each switching tube Ti is connected to an anode of the corresponding diode Di, and the switching tubes T1-T4 are sequentially connected in series, namely an emitter or a cathode of a previous switching tube is connected to a collector or an anode of a next switching tube; the positive electrode of the capacitor Cd1 is connected to the collector or anode of the switch tube T1, and the negative electrode of the capacitor Cd1 is connected to the positive electrode of the capacitor Cd2 and the emitter or cathode of the switch tube T5; the negative electrode of the capacitor Cd2 is connected to the emitter or the cathode of the switch tube T4; the collector or anode of the switch tube T5 is connected to the emitter or cathode of the switch tube T1, the emitter or cathode of the switch tube T5 is connected to the collector or anode of the switch tube T6; the emitter or cathode of the switch tube T6 is connected to the collector or anode of the switch tube T4,
the power device loss calculation method is characterized by comprising the following steps:
determining the relation between the conduction angles and the duty ratios of the switching tubes T1, T2 and T5 and the diodes D1, D2 and D5;
calculating the turn-on loss, the turn-off loss and the on-state loss of the switching tubes T1, T2 and T5 according to the turn-on angle and the duty ratio;
and calculating the turn-off loss and the turn-on loss of the diodes D1, D2 and D5 according to the turn-on angle and the duty ratio.
2. The method of claim 1, wherein the method of calculating the power loss of a three-level wind power converter,
let alpha denote the power factor angle, M be the modulation degree, then
When the conduction angle of the switch tube T1 is in an interval [0, pi-alpha ], the duty ratio is M sin (wt + alpha);
when the conduction angle of the diode D1 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is M sin (wt + alpha);
when the conduction angle of the switching tube T2 is in an interval [0, pi ], the duty ratio is (1+ M sin (wt + alpha))/2;
when the conduction angle of the diode D2 is in an interval [ pi, 2 pi-alpha ], the duty ratio is (1+ M sin (wt + alpha))/2;
when the conduction angle of the diode D2 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is (1+ M sin (wt + alpha))/2;
when the conduction angle of the switching tube T5 is in an interval [ pi, 2 pi-alpha ], the duty ratio is (1+ M sin (wt + alpha))/2;
when the conduction angle of the switching tube T5 is in an interval [2 pi-alpha, 2 pi ], the duty ratio is (1-M sin (wt + alpha))/2;
when the conduction angle of the diode D5 is in an interval [0, pi-alpha ], the duty ratio is (1-M sin (wt + alpha))/2;
when the conduction angle of the diode D5 is in an interval [ pi-alpha, pi ], the duty ratio is (1+ M sin (wt + alpha))/2.
3. The method of claim 2, wherein the power loss of the three-level wind power converter is calculated,
the switching tubes T1, T2 and T5 have switching losses of
Figure FDA0002649368400000021
Wherein,
Ipand UmThe amplitudes of the current I and the voltage U of the single-phase bridge arm respectively, w is the frequency of the current I and the voltage U, t represents time, fswFor the switching frequency of the device to be,
Figure FDA0002649368400000031
k1is a correction coefficient, Q, introduced according to the relationship between the switching condition and the standard test condition when the IGCT is switched onon0Is a single pulse of switching-on energy, Vd0And iL0Is a standard test condition in data manuals;
the turn-off losses of the switching tubes T1, T2 and T5 are
Figure FDA0002649368400000032
Wherein,
Figure FDA0002649368400000033
k2is a correction coefficient, Q, introduced according to the relation between the switching condition and the standard test condition when the switching tube is turned offoff0The energy is turned off for a single pulse;
the on-state losses of the switching tubes T1, T2 and T5 are
Figure FDA0002649368400000034
Wherein,
VT0is a threshold voltage rTIs a slope resistance.
4. The method of claim 3, wherein the power loss of the three-level wind power converter is calculated,
the diodes D1, D2 and D5 have turn-off losses of
Figure FDA0002649368400000035
Wherein,
Figure FDA0002649368400000036
k3the correction coefficient is introduced according to the relation between the switching condition and the standard test condition when the diode is turned off;
the on-state losses of the diodes D1, D2 and D5 are
Figure FDA0002649368400000041
5. The method of claim 3, wherein the power loss of the three-level wind power converter is calculated,
the loss of the switching tube T1 includes:
switching losses
Figure FDA0002649368400000042
Loss of on state
Figure FDA0002649368400000043
6. The method for calculating the power loss of a three-level wind power converter according to claim 3 or 5,
the loss of the switching tube T2 includes:
switching losses
Figure FDA0002649368400000044
Loss of on state
Figure FDA0002649368400000045
7. The method for calculating the power loss of a three-level wind power converter according to claim 3 or 5,
the losses of the switching tube T5 include:
switching losses
Figure FDA0002649368400000046
Loss of on state
Figure FDA0002649368400000047
8. The method of claim 4, wherein the power loss of the three-level wind power converter is calculated,
the losses of the diode D1 include:
switching losses
Figure FDA0002649368400000051
Loss of on state
Figure FDA0002649368400000052
9. The method for calculating the power loss of a three-level wind power converter according to claim 4 or 8,
the losses of the diode D2 include:
switching losses
Figure FDA0002649368400000053
Loss of on state
Figure FDA0002649368400000054
10. The method for calculating the power loss of a three-level wind power converter according to claim 4 or 8,
the losses of the diode D5 include:
switching losses
Figure FDA0002649368400000055
Loss of on state
Figure FDA0002649368400000056
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