CN109672355A - T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control - Google Patents
T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control Download PDFInfo
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- CN109672355A CN109672355A CN201811265209.5A CN201811265209A CN109672355A CN 109672355 A CN109672355 A CN 109672355A CN 201811265209 A CN201811265209 A CN 201811265209A CN 109672355 A CN109672355 A CN 109672355A
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control that the invention discloses a kind of, including outer voltage use neuron PI adaptive controller, and current inner loop uses conventional PI control device.The input of DC voltage outer ring is input of the deviation of two capacitance voltages as neuron PI adaptive controller, input of the output as current inner loop after neuron PI controller, it is compared again with triangular wave by conventional PI control device with flowing into neutral point current and make difference, obtains complementary T-type three-level inverter neutral-point potential balance of the two-way pwm signal control with balancing circuitry.Outer voltage, which uses, is based on neuron PI parameter adaptive control device, and the parameter of controller can be adjusted in real time online.Compared to conventional PI control device, have adaptive ability strong, fast response time, it is more preferable that outer voltage controller exports result.
Description
Technical field
The present invention relates to a kind of T-type three-level inverter neutral-point-potential balance controls based on neuron PI self adaptive control
System belongs to power electronics and micro-capacitance sensor technical field.
Background technique
In 2007, the single-phase benefit of opening up of TNPC was proposed by KNAUP, Peter, T-type neutral-point-clamped (" T " Type Neutral
Point Clamped, TNpc) tri-level circuit is further new obtained to the optimization of modifying of NPC tri-level circuit
Circuit open up benefit, but T-type three-level inverter remains midpoint potential imbalance problem, seriously affects the output of exchange side
Voltage current waveform.If serious offset occurs for midpoint potential, three-level inverter is that have probability to become two level blocks, is led
Cause two DC capacitors damage of DC side.It will affect the normal operation of inverter when serious, it is most likely that cause system crash.
Summary of the invention
Goal of the invention: to overcome novel Circuit for Neutral-Point Voltage Balance to control in T-type three-level inverter using conventional PI control device
The defect of point potential balance, provides a kind of T-type three-level inverter neutral-point potential balance based on neuron PI self adaptive control
Control system can effectively control neutral-point potential balance, have certain Ability of Resisting Disturbance, adaptive ability and system stability.
In order to solve the above technical problems, the present invention provides a kind of three level of T-type based on neuron PI self adaptive control
Inverter neutral-point-potential balance control system, the midpoint potential realization for the T-type three-level inverter with balancing circuitry are dynamic
State balance, including the PI controller for controlling current inner loop and the neuron PI self adaptive control for controlling outer voltage
Device, the output of the neuron PI adaptive controller are flowed into as the setting value for flowing into T-type three-level inverter midpoint electric current
The electric current at T-type three-level inverter midpoint and the difference of the setting value pass through PI controller, the output of the PI controller and mould
The triangle wave of block generator output, the switching tube of the pwm signal control balancing circuitry of output two-way complementation being opened and closing
It is disconnected；
The input of the neuron PI adaptive controller are as follows:
In formula: Uc1And Uc2Respectively DC bus capacitor C1And C2On voltage, e is voltage error；
It is exported are as follows:
id *=Kpx1+Kix2 (2)
In formula, Proportional coefficient KPWith integral coefficient KIThe weighting coefficient of corresponding Neuro Controller；
The neuron PI adaptive controller is based on neuron PI ADAPTIVE CONTROL comparative example COEFFICIENT KPAnd integral
COEFFICIENT KICarry out automatic adjusument.
The T-type three-level inverter with balancing circuitry include including switching tube Sd1, switching tube Sd2, capacitor C1,
Capacitor C2 and balance inductance L1, the switching tube Sd1 and switching tube Sd2 are sequentially turned on, and switching tube Sd1 and switching tube Sd2
It is connected and is connected by balance inductance L1 with T-type three-level inverter midpoint；When switching tube Sd1 conducting, switching tube Sd2 ends
When, capacitor C1, switching tube Sd1 and balance inductance L1 form charge circuit, and energy is transferred on balance inductance L1 from capacitor C1；
When switching tube Sd1 ends and switching tube Sd2 is connected, capacitor C2, switching tube Sd2 and balance inductance L1 form discharge loop, energy
Amount is transferred on capacitor C2 from inductance L1；Pwm signal the control switch pipe Sd1's and switching tube Sd2 turns on and off.
The neuron PI ADAPTIVE CONTROL specifically:
Defining e (k) indicates the error amount of current sample time after discretization, e (k)=Uc1-Uc2；
Define the bouds on error that M is setting, M > 0；
When | e (k) | when >=M,
In formula, i* dmaxFor the maximum current for flowing into midpoint；
When | e (k) | when≤M,
KP(k+1)=KP(k)+η1x1x3 (4)
In formula: k is adjustment serial number；η1Rate is adjusted to increase；
KI(k+1)=KI(k)+η2x1x2 (5)
In formula: k is adjustment serial number；η2To increase regulation.
The utility model has the advantages that compared with prior art, the present invention the present invention from design hardware circuit, it is inverse to three level of T-type
Become device and add four bridge legs to control neutral-point potential balance, the four bridge legs added are taken based on SPWM algorithm and control two IGBT
Turn on and off, the outer voltage pi regulator in control strategy, which uses, is based on neuron PI ADAPTIVE CONTROL, can be with
The parameter of controller is adjusted in real time online, current inner loop can be controlled effectively using traditional pi regulator, the present invention
Neutral-point potential balance has certain Ability of Resisting Disturbance, adaptive ability, system stability, fast response time, outer voltage control
Device exports the advantages that result is more preferable, and is easily achieved, and has a good application prospect.
Detailed description of the invention
Fig. 1 is that the midpoint potential that is used to control of the invention stablizes the T-type three-level inverter for adding four bridge legs.
Fig. 2 is the control strategy for being used to control two IGBT switching tubes on the balancing circuitry added of the invention.
Specific embodiment
The inventive method is further described below with reference to embodiment.
A kind of T-type three-level inverter for adding balancing circuitry as shown in Figure 1, the four bridge legs added are used to balance
As shown in figure 1 shown in balancing circuitry, switching tube Sd1 and switching tube Sd2 are sequentially turned on the bridge arm of midpoint potential, when switching tube Sd1 is led
When logical and switching tube Sd2 ends, capacitor C1, switching tube Sd1 and balance inductance L1 form charge circuit, and energy turns from capacitor C1
It moves on on balance inductance L1；When Sd1 ends and switching tube Sd2 is connected, capacitor C2, switching tube Sd2 and balance inductance L1 are formed
Discharge loop, energy are transferred on capacitor C2 from balance inductance L1.To realize on capacitor C1 and capacitor C2 in one cycle
The dynamic equilibrium of energy, with this come achieve the purpose that control neutral-point potential balance.
Specific connection type are as follows: the emitter of switching tube Sd1 is connected with the collector of switching tube Sd2 in figure, switch
The collector of pipe Sd1 is connected with DC side positive pole, and the emitter of switching tube Sd2 is connected with the cathode of DC power supply.
The connected balance inductance L1 of switching tube Sd1 and switching tube Sd2 is connected with T-type three-level inverter midpoint.Two ICBT switching tubes
Sd1 and Sd2 and balance inductance L1 collectively form novel Circuit for Neutral-Point Voltage Balance.
It is illustrated in figure 2 the balancing circuitry control strategy for taking outer voltage and current inner loop.Its current inner loop is still adopted
Conventional PI control is taken, the adaptive controller of neuron PI is taken based on for its outer voltage.Outer voltage neuron PI net
The input of network are as follows:
In formula 1: Uc1And Uc2Respectively DC bus capacitor C1And C2On voltage, e is voltage error.
The output of neuron PI network are as follows:
id *=Kpx1+Kix2 (2)
In formula, Proportional coefficient KPWith integral coefficient KIThe weighting coefficient of corresponding Neuro Controller.According to the side of expert system
Method adjusts weighting coefficient in real time, according to the deviation of voltage, the integral and differential of deviation, at real-time judgement system
Working condition, according to its state in which determine adjustment rule, and according to their size determine adjustment intensity.Enable e (k)
The error amount of current sample time, its basic adjustment law are as follows after expression discretization:
(1) as | e (k) | when >=M, the absolute value of specification error is very big.No matter error change trend, no matter that is,
x1And x3Value whether be greater than 0 and be also less than 0, should all stop integrating at once, i.e., enable x at once2Equal to 0, while considering to make to control
The Proportional coefficient K of device processedPIt is sufficiently large, reduce Error Absolute Value with maximum speed.At this point, it, which is equivalent to, implements open loop control
System.Kp presses formula (2) value.
(2) as | e (k) | when≤M, deviation is smaller, and system enters little deviation range.The controller Proportional coefficient K of little deviationP
With x1x3It is proportional, i.e., no matter x1x3 < 0, x1x3 > 0, x1x3=0, the proportionality coefficient of controller is taken by formula (4) at this time
Value.
KP(k+1)=KP(k)+η1x1x3 (4)
In formula: k is adjustment serial number；η1Rate is adjusted to increase.
The integral coefficient K of little deviation range internal controllerIAnd x1x2It is directly proportional.I.e. no matter x1x2<0、x1x2>0、x1x2=0,
Integral coefficient K at this timeIBy formula (5) value.
KI(k+1)=KI(k)+η2x1x2 (5)
In formula: k is adjustment serial number；η2To increase regulation.
Based on described above, the T-type three-level inverter midpoint potential under neuron PI self adaptive control can be summed up
It is as follows to balance control parameter adjustment rule:
When | e (k) | when >=M,
When | e (k) | when≤M, KP(k+1)=KP(k)+η1x1x3, KI(k+1)=KI(k)+η2x1x2。
It is above it is various in, M be the bouds on error set, M > 0；
As shown in Fig. 2, outer voltage control strategy is using the output after neuron PI self adaptive control as in inflow
Point electric current i3Setting value, i.e. current inner loop control, inner loop control uses conventional PI control, i3Pass through PI with the difference of setting value
Controller and triangle wave, the pwm signal control Sd1's and Sd2 of output two-way complementation turns on and off.
Claims (3)
1. a kind of T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control, for tool
There is the midpoint potential of the T-type three-level inverter of balancing circuitry to realize dynamic equilibrium, it is characterised in that: including for controlling electric current
The PI controller of inner ring and neuron PI adaptive controller for controlling outer voltage, the neuron PI self adaptive control
The output of device flows into the electric current at T-type three-level inverter midpoint as the setting value for flowing into T-type three-level inverter midpoint electric current
The triangle wave exported with the difference of the setting value by PI controller, the output of the PI controller and module generator,
The switching tube of the pwm signal control balancing circuitry of output two-way complementation turns on and off；
The input of the neuron PI adaptive controller are as follows:
In formula: Uc1And Uc2Respectively DC bus capacitor C1And C2On voltage, e is voltage error；
It is exported are as follows:
id *=Kpx1+Kix2 (2)
In formula, Proportional coefficient KPWith integral coefficient KIThe weighting coefficient of corresponding Neuro Controller；
The neuron PI adaptive controller is based on neuron PI ADAPTIVE CONTROL comparative example COEFFICIENT KPWith integral coefficient KI
Carry out automatic adjusument.
2. a kind of T-type three-level inverter midpoint potential based on neuron PI self adaptive control according to claim 1
Balance control system, it is characterised in that: the T-type three-level inverter with balancing circuitry includes including switching tube Sd1, opens
Pipe Sd2, capacitor C1, capacitor C2 and balance inductance L1 are closed, the switching tube Sd1 and switching tube Sd2 are sequentially turned on, and the switching tube
Sd1 and switching tube Sd2 is connected and is connected by balance inductance L1 with T-type three-level inverter midpoint；When switching tube Sd1 conducting and
When switching tube Sd2 ends, capacitor C1, switching tube Sd1 and balance inductance L1 form charge circuit, and energy is transferred to flat from capacitor C1
It weighs on inductance L1；When switching tube Sd1 ends and switching tube Sd2 is connected, capacitor C2, switching tube Sd2 and balance inductance L1 are formed
Discharge loop, energy are transferred on capacitor C2 from inductance L1；Pwm signal the control switch pipe Sd1's and switching tube Sd2 opens
Logical and shutdown.
3. a kind of T-type three-level inverter midpoint potential based on neuron PI self adaptive control according to claim 1
Balance control system, it is characterised in that: the neuron PI ADAPTIVE CONTROL specifically:
Defining e (k) indicates the error amount of current sample time after discretization, e (k)=Uc1-Uc2；
Define the bouds on error that M is setting, M > 0；
When | e (k) | when >=M,
In formula, i* dmaxFor the maximum current for flowing into midpoint；
When | e (k) | when≤M,
KP(k+1)=KP(k)+η1x1x3 (4)
In formula: k is adjustment serial number；η1Rate is adjusted to increase；
KI(k+1)=KI(k)+η2x1x2 (5)
In formula: k is adjustment serial number；η2To increase regulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811265209.5A CN109672355A (en) | 2018-10-29 | 2018-10-29 | T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control |
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| CN201811265209.5A CN109672355A (en) | 2018-10-29 | 2018-10-29 | T-type three-level inverter neutral-point-potential balance control system based on neuron PI self adaptive control |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768558A (en) * | 2019-09-24 | 2020-02-07 | 山东电工电气集团新能科技有限公司 | Inverter midpoint voltage balancing method based on time distribution factor method |
| CN110798089A (en) * | 2019-11-05 | 2020-02-14 | 山东电工电气集团新能科技有限公司 | Inverter neutral point potential balancing method based on improved intelligent PI control |
| CN112271909A (en) * | 2020-10-29 | 2021-01-26 | 科华恒盛股份有限公司 | Bus balance bridge voltage-sharing control method and device |
| CN112787530A (en) * | 2021-01-11 | 2021-05-11 | 上海电气富士电机电气技术有限公司 | Three-level inverter with bus midpoint voltage compensation and control method thereof |
| CN116032138A (en) * | 2023-03-29 | 2023-04-28 | 深圳市首航新能源股份有限公司 | Driving method, driving device, inverter circuit and inverter |
| CN116131618A (en) * | 2022-12-13 | 2023-05-16 | 深圳市麦格米特驱动技术有限公司 | Aging test device, method and system |
-
2018
- 2018-10-29 CN CN201811265209.5A patent/CN109672355A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768558A (en) * | 2019-09-24 | 2020-02-07 | 山东电工电气集团新能科技有限公司 | Inverter midpoint voltage balancing method based on time distribution factor method |
| CN110798089A (en) * | 2019-11-05 | 2020-02-14 | 山东电工电气集团新能科技有限公司 | Inverter neutral point potential balancing method based on improved intelligent PI control |
| CN112271909A (en) * | 2020-10-29 | 2021-01-26 | 科华恒盛股份有限公司 | Bus balance bridge voltage-sharing control method and device |
| CN112787530A (en) * | 2021-01-11 | 2021-05-11 | 上海电气富士电机电气技术有限公司 | Three-level inverter with bus midpoint voltage compensation and control method thereof |
| CN112787530B (en) * | 2021-01-11 | 2023-04-07 | 上海电气富士电机电气技术有限公司 | Three-level inverter with bus midpoint voltage compensation and control method thereof |
| CN116131618A (en) * | 2022-12-13 | 2023-05-16 | 深圳市麦格米特驱动技术有限公司 | Aging test device, method and system |
| CN116131618B (en) * | 2022-12-13 | 2024-04-19 | 深圳麦格米特电气股份有限公司 | Aging test device, method and system |
| CN116032138A (en) * | 2023-03-29 | 2023-04-28 | 深圳市首航新能源股份有限公司 | Driving method, driving device, inverter circuit and inverter |
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