CN109713675A - Electric power spring control method based on two close cycles - Google Patents
Electric power spring control method based on two close cycles Download PDFInfo
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- CN109713675A CN109713675A CN201811536652.1A CN201811536652A CN109713675A CN 109713675 A CN109713675 A CN 109713675A CN 201811536652 A CN201811536652 A CN 201811536652A CN 109713675 A CN109713675 A CN 109713675A
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- voltage
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The electric power spring control method based on two close cycles that the invention discloses a kind of, the phase angle δ of critical loads voltage delay network voltage when calculating the reactive compensation of electric power spring, is arranged reference voltage；Critical loads instantaneous voltage is acquired, reference voltage and critical loads voltage error value e are calculated, error amount is inputted in pi controller, adjusts pi controller parameter, so that the reference voltage given on critical loads voltage-tracing；Inductive current instantaneous value is acquired, pi controller output valve and inductive current error amount are calculated, error amount is inputted into proportional controller, adjusts proportional controller parameter, so that inductive current tracks upper pi controller output valve；Using proportional controller output valve as modulation wave signal, modulation wave signal is generated to 4 road pwm signals compared with carrier signal；4 road pwm signals are separately added into dead time, form the pwm signal with dead zone of final control IGBT on-off.The present invention effectively reduces the harmonic content of critical loads voltage and electric power spring output voltage.
Description
Technical field
The present invention relates to electronic power inversion and its control technology fields, and in particular to a kind of electric power bullet based on two close cycles
Spring control method.
Background technique
As the fossil energies such as Global Oil, natural gas, coal are increasingly depleted, the renewable energy such as solar energy, wind energy are
Through the hot spot for increasingly becoming various countries' research.The generated energy that wind energy, the intermittence of solar energy and unstability make its total is difficult to
Estimation, will certainly bring to power grid when renewable energy power generation is connected to the grid on a large scale and seriously affect, and mainly include voltage
Fluctuation, frequency flickering and harmonic pollution etc., wherein voltage fluctuation and frequency flickering can bring shadow to user side electrical equipment
It rings, gently then influences equipment service efficiency, it is heavy then burning apparatus causes fire.
The method that current electric system reply voltage ripple of power network generallys use is to install reactive power compensator and battery,
But reactive power compensator has stringent limitation to infield, and service lifetime of accumulator is short, involves great expense, use cost compared with
It is high, it is difficult to a wide range of to use.S.Y.R.Hui of Hong Kong University et al. is in " Dynamic Modeling of Electric
Electric power spring is proposed in this article of Springs ", can effectively solve because voltage ripple of power network gives load side bus voltage band
Carry out unstable problem.At present electric power spring use single closed loop control method based on critical loads voltage effective value, but this
Kind control method can introduce harmonic wave in inversion link, increase the harmonic content of voltage on critical loads, it is normal to influence critical loads
Work.
Summary of the invention
The electric power spring control method based on two close cycles that the purpose of the present invention is to provide a kind of, it is defeated to reduce electric power spring
The harmonic content of voltage and critical loads voltage out.
The technical solution for realizing the aim of the invention is as follows: a kind of electric power spring control method based on two close cycles, uses
The double-closed-loop control of outer voltage inductive current inner ring based on critical loads, includes the following steps:
The phase angle δ of critical loads voltage delay network voltage, setting reference when step 1, calculating electric power spring reactive compensation
Voltage；
Step 2, acquisition critical loads instantaneous voltage, calculate reference voltage and critical loads voltage error value e, by error
In value input pi controller, pi controller parameter is adjusted, so that the ginseng given on critical loads voltage-tracing
Examine voltage；
Step 3, acquisition inductive current instantaneous value, calculate pi controller output valve and inductive current error amount, will
Error amount inputs proportional controller, adjusts proportional controller parameter, so that inductive current tracks upper pi controller output
Value；
Step 4, using proportional controller output valve as modulation wave signal, modulation wave signal is generated compared with carrier signal
4 road pwm signals；
4 road pwm signals are separately added into dead time by step 5, form the PWM with dead zone of final control IGBT on-off
Signal.
As a kind of specific embodiment, in step 1, critical loads voltage delay power grid electricity when electric power spring reactive compensation
The phase angle δ of pressure, the phase of reference voltage are-δ, and reference voltage lags the expression formula of grid voltage phase-angle δ are as follows:
Wherein VGIt is network voltage, VSIt is critical loads voltage, R1It is transmission line resistance, R2It is critical loads resistance, R3
It is non-critical loads resistance, θ is the angle of critical loads voltage Yu non-critical loads current vector, L1It is transmission line inductance,
ω is network voltage frequency,For transmission line impedance angle,It is critical loads voltage delay in the constant voltage V of settingG1's
Phase angle,The constant voltage V of setting is ahead of for network voltageG1Phase angle.
As a kind of specific embodiment, in step 2, the transmission function of pi controller are as follows:
Wherein behalf transfer function model, the output S of pi controller1Are as follows:
In formula, e is reference voltage and critical loads voltage error value, and kp, ki are pi controller parameter.
As a kind of specific embodiment, in step 3, the transmission function of proportional controller are as follows:
G2(s)=kp1
The output S of proportional controller2Are as follows:
S2=kp1×(S1-iL)
Wherein iLIt is collected inductive current instantaneous value, S1For the output valve of pi controller, kp1For ratio control
Device parameter processed.
As a kind of specific embodiment, in step 4, the triangular carrier that selecting frequency 5kHz, amplitude are 1 is carried out single
Polar modulation, method particularly includes:
Wherein TaAnd TbThe respectively turn-on logic of single-phase full bridge inverter circuit a phase and b phase IGBT pipe, modulating wave just
Half period makes Ta=1, by modulating wave compared with carrier wave, the T when modulating wave is greater than carrier wavebT when=1 modulating wave is less than carrier waveb=
0；Make T in the negative half-cycle of modulating wavea=0, by modulating wave compared with carrier wave when modulating wave be less than carrier wave when Tb=0, modulating wave
When greater than carrier wave, Tb=1.
As a kind of specific embodiment, in step 5, it is delayed to pwm signal signal, by the pwm signal after delay
The pwm signal not being delayed carries out logic and operation, and what is obtained is the pwm signal with dead time.
Compared with prior art, the present invention its remarkable advantage are as follows: the present invention passes through the outer voltage electricity based on critical loads
The double-closed-loop control method of inducing current inner ring, the harmonic wave for effectively reducing critical loads voltage and electric power spring output voltage contain
Amount.
Detailed description of the invention
Fig. 1 is electric power spring double-closed-loop control block diagram.
Fig. 2 is electric power spring application system schematic diagram.
Fig. 3 is electric power spring reactive compensation phase diagram.
Fig. 4 is electric power spring application system topology diagram.
Fig. 5 is software dead band illustraton of model.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention program is further illustrated.
As shown in Figure 1, the electric power spring control method based on two close cycles, using the outer voltage inductance based on critical loads
The double-closed-loop control of current inner loop, includes the following steps:
The phase angle δ of critical loads voltage delay network voltage, setting reference when step 1, calculating electric power spring reactive compensation
The amplitude and phase of voltage, wherein the phase of reference voltage is-δ；
Electric power spring application system model using KCL and KVL law as shown in Fig. 2, can obtain:
VG=VS+I1(R1+jωL1)
=VS+(I2+I3)(R1+jωL1)
=VG1+I3(R1+jωL1)
V in formulaGIt is network voltage, VSIt is critical loads voltage, I1It is electric current on transmission line, I2It is that critical loads power on
Stream, I3It is that non-critical loads power on stream, R1It is transmission line resistance, L1It is transmission line inductance, VG1It is the steady state value of setting, only
It is related with circuit parameter, in which:
R2It is critical loads resistance, VG1Amplitude and phase be respectively as follows:
For transmission line impedance angle, can be acquired according to circuit parameterAre as follows:
According to the phase relation of Fig. 3 electric power spring reactive compensation, can acquire:
WhereinIt is network voltage and VG1Angle between vector, R3Non-critical loads resistance, θ be critical loads voltage with
The angle of non-critical loads current vector can pass through circuit parameter calculation.
Critical loads voltage phase angle lags grid voltage phase-angle δ are as follows:
Step 2, acquisition critical loads instantaneous voltage, calculate reference voltage and critical loads voltage error value e, by error
In value input pi controller, pi controller parameter kp, ki is adjusted, so that final error e levels off to 0, it is crucial
Load voltage can track given reference voltage.
The transmission function of pi controller are as follows:
The output S of pi controller1Are as follows:
Scale parameter is bigger, and the response speed of system is faster, the disadvantage for also bringing overshoot bigger accordingly, integral parameter
Selection it is related with the time that system reaches stable state, integral parameter is bigger, and the time that system reaches stable state is faster, but corresponding
Unstable disadvantage can be brought to system, the parameter of pi controller is continued to optimize during emulation, so that system
With excellent dynamic characteristic, final scale parameter kp5 are taken, integrated reference kiTake 100.
Step 3, acquisition inductive current instantaneous value, calculate pi controller output valve and inductive current error amount e1,
Error amount is inputted into proportional controller, adjusts proportional controller parameter kp1, inductive current is enabled to track given reference value.
The transmission function of proportional controller are as follows:
G2(s)=kp1
The output S of proportional controller2Are as follows:
S2=kp1×(S1-iL)
Wherein iLIt is collected inductive current instantaneous value, S1For the output valve of pi controller, the mesh of current inner loop
Be increase inversion system bandwidth, make system have excellent static and dynamic performance, by emulation in continue to optimize, ultimate current
Inner ring proportional controller parameter kp1Take 0.1.
Step 4, proportional controller output valve are modulation wave signal, by modulation wave signal compared with carrier signal generation 4
Road pwm signal, wherein carrier wave selects triangular wave, carrier frequency 5kHz.
In conjunction with the structure of single-phase full bridge inverter circuit in Fig. 4 electric power spring topological diagram, modulated using unipolarity, specific method
Are as follows:
Wherein TaAnd TbThe respectively turn-on logic of single-phase full bridge inverter circuit a phase and b phase IGBT pipe, modulating wave just
Half period makes Ta=1, by modulating wave compared with carrier wave, the T when modulating wave is greater than carrier wavebT when=1 modulating wave is less than carrier waveb=
0；Make T in the negative half-cycle of modulating wavea=0, by modulating wave compared with carrier wave when modulating wave be less than carrier wave when Tb=0, modulating wave
When greater than carrier wave, Tb=1.
4 road pwm signals are separately added into dead time by step 5, and dead band time setting is T=2 μ s, form final control
The pwm signal with dead zone of IGBT on-off.
In conjunction with the illustraton of model of Fig. 5 software dead band, software dead band mainly includes time delay module and logic calculation module, wherein prolonging
When module time be set as T=1 μ s.Logic module logic calculation is ' with ', by the pwm signal after delay and the PWM not being delayed
Signal carries out logic and operation, and what is obtained is the pwm signal with dead time.
Embodiment
In order to verify the validity of the present invention program, following emulation experiment is carried out.
Simulation model is built in MATLAB/Simulink, using discrete time, the simulation model of fixed step size, when sampling
Between be 1e-6s, the component parameter used in emulation is as shown in table 1.
Table 1 emulates component parameter
When network voltage is higher than reference value, ES works in perceptual model for definition, and ES plays the role of reducing voltage at this time；
When network voltage is equal to reference value, ES works in resistive mode；When network voltage is lower than reference value, ES works in capacitive mould
Formula, ES plays boosting at this time.
The range that ES works in net side voltage fluctuation under reactive compensation mode is calculated according to the parameter of table 1, such as 2 institute of table
Show.
2 voltage ripple of power network range of table
With UG=244.21V simulates perceptual model, with UG=207.21V simulates capacitive mode.Using based on crucial negative
Carry the critical loads voltage of single closed loop control method of voltage effective value and the analysis knot of electric power spring harmonic wave of output voltage content
Fruit is as shown in table 3.
The single closed-loop control simulation result of table 3
Using proposed by the present invention based on the critical loads of outer voltage and inductive current inner ring double-closed-loop control method electricity
The results are shown in Table 4 for pressure and the analysis of the harmonic content of electric power spring output voltage.
4 double-closed-loop control simulation result of table
Contrast table 4 and table 3 are it is found that using improved double-loop control strategy, and in inductive mode, the output of electric power spring is electric
Harmonic content is pressed to be reduced to 1.30% from 3.87%, critical loads voltage harmonic content is reduced to 0.48% from 1.97%.Capacitive
Under mode, electric power spring output voltage is reduced to 1.28% from 5.45%, and critical loads voltage harmonic content is reduced from 3.93%
To 0.91%.
To sum up it follows that the electric power spring control method proposed by the present invention based on two close cycles can be effective
Reduction electric power spring output voltage and critical loads voltage harmonic content.
Claims (6)
1. the electric power spring control method based on two close cycles, which is characterized in that use the outer voltage inductance based on critical loads
The double-closed-loop control of current inner loop, includes the following steps:
The phase angle δ of critical loads voltage delay network voltage, is arranged reference voltage when step 1, calculating electric power spring reactive compensation；
Step 2, acquisition critical loads instantaneous voltage, calculate reference voltage and critical loads voltage error value e, and error amount is defeated
Enter in pi controller, adjust pi controller parameter, so that the reference electricity given on critical loads voltage-tracing
Pressure；
Step 3, acquisition inductive current instantaneous value, calculate pi controller output valve and inductive current error amount, by error
Value input proportional controller, adjusts proportional controller parameter, so that inductive current tracks upper pi controller output valve；
Step 4, using proportional controller output valve as modulation wave signal, modulation wave signal is generated into 4 tunnels compared with carrier signal
Pwm signal；
4 road pwm signals are separately added into dead time by step 5, form the pwm signal with dead zone of final control IGBT on-off.
2. the electric power spring control method according to claim 1 based on two close cycles, which is characterized in that in step 1, electric power
The phase angle δ of critical loads voltage delay network voltage when spring reactive compensation, the phase of reference voltage are-δ, reference voltage lag
The expression formula of grid voltage phase-angle δ are as follows:
Wherein VGIt is network voltage, VSIt is critical loads voltage, R1It is transmission line resistance, R2It is critical loads resistance, R3Right and wrong
Critical loads resistance, θ are the angle of critical loads voltage Yu non-critical loads current vector, L1It is transmission line inductance, ω is
Network voltage frequency,For transmission line impedance angle,It is critical loads voltage delay in the constant voltage V of settingG1Phase
Angle,The constant voltage V of setting is ahead of for network voltageG1Phase angle.
3. the electric power spring control method according to claim 1 based on two close cycles, which is characterized in that in step 2, ratio
The transmission function of integral controller are as follows:
Wherein behalf transfer function model, the output S of pi controller1Are as follows:
In formula, e is reference voltage and critical loads voltage error value, and kp, ki are pi controller parameter.
4. the electric power spring control method according to claim 1 based on two close cycles, which is characterized in that in step 3, ratio
The transmission function of controller are as follows:
G2(s)=kp1
The output S of proportional controller2Are as follows:
S2=kp1×(S1-iL)
Wherein iLIt is collected inductive current instantaneous value, S1For the output valve of pi controller, kp1For proportional controller ginseng
Number.
5. the electric power spring control method according to claim 1 based on two close cycles, which is characterized in that in step 4, choose
The triangular carrier that frequency is 5kHz, amplitude is 1 carries out unipolarity modulation, method particularly includes:
Wherein TaAnd TbThe respectively turn-on logic of single-phase full bridge inverter circuit a phase and b phase IGBT pipe, in the positive half cycle of modulating wave
Phase makes Ta=1, by modulating wave compared with carrier wave, the T when modulating wave is greater than carrier wavebT when=1 modulating wave is less than carrier waveb=0；?
The negative half-cycle of modulating wave makes Ta=0, by modulating wave compared with carrier wave when modulating wave be less than carrier wave when Tb=0, modulating wave is greater than
When carrier wave, Tb=1.
6. the electric power spring control method according to claim 1 based on two close cycles, which is characterized in that right in step 5
Pwm signal signal is delayed, and the pwm signal after delay and the pwm signal not being delayed are carried out logic and operation, obtain i.e.
For the pwm signal with dead time.
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Cited By (3)
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| CN110504693A (en) * | 2019-08-25 | 2019-11-26 | 南京理工大学 | A kind of electric power spring optimal control method measured under disturbance based on load parameter |
| CN112600257A (en) * | 2020-12-09 | 2021-04-02 | 南京理工大学 | Power spring control method based on transmission line current and key load voltage compensation |
| CN115664265A (en) * | 2022-09-28 | 2023-01-31 | 西安爱科赛博电气股份有限公司 | Control method for inhibiting motor cluster load current fluctuation |
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