CN203218946U - Novel electric automobile charger based on one-cycle control strategy - Google Patents
Novel electric automobile charger based on one-cycle control strategy Download PDFInfo
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- CN203218946U CN203218946U CN 201320249434 CN201320249434U CN203218946U CN 203218946 U CN203218946 U CN 203218946U CN 201320249434 CN201320249434 CN 201320249434 CN 201320249434 U CN201320249434 U CN 201320249434U CN 203218946 U CN203218946 U CN 203218946U
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Abstract
The utility model discloses a novel electric automobile charger based on one-cycle control strategy. The novel electric automobile charger comprises a three phase power supply connected with an LCL filter; the LCL filter is connected to an input terminal of a main circuit of a three phase PWM power converter; a direct current output terminal of the three phase PWM power converter is in parallel connection with a support capacitance; a first load and a discharge loop are in parallel connection with the direct current output terminal of the three phase PWM power converter through a selective switch; a control system of the three phase PWM power converter acquires inductive current signal of the LCL filter, a voltage signal of a connection point of the LCL filter with the input terminal of the main circuit of the three phase PWM power converter, and a direct current voltage signal of the support capacitance C; and the control system controls the three phase PWM power converter to output corresponding pulse switch signal. The utility model has the advantages of simple control, fast response, low production cost and capability of realizing seamless switching from rectification to inversion of the charger.
Description
Technical field
The utility model relates to a kind of novel electric vehicle charger based on the monocycle control strategy.
Background technology
The charging electric vehicle machine is nonlinear-load, produces harmonic current during charging, causes voltage distortion.At present, elimination and inhibition current harmonics have become a focus of charging electric vehicle machine.
1. the three-phase PWM power inverter is used widely in the charging electric vehicle machine owing to have advantages such as current on line side sine, power factor height, energy two-way flow.Control strategy to the three-phase PWM power inverter has the ring of stagnating control, PREDICTIVE CONTROL, vector control, direct Power Control etc., but these control methods all need to adopt dq coordinate transform and SPWM or SVPWM modulation, and system is comparatively complicated, the production cost height.
Monocycle control circuit compact conformation, used element is few and response speed is fast, but the limitation of system's fluctuation of service occurs under underloading or anti-phase inverter mode, being applied to has a lot of difficulties on the charging electric vehicle machine.
The utility model content
The purpose of this utility model is exactly in order to address the above problem, traditional monocycle control method is improved, a kind of novel electric vehicle charger based on the monocycle control strategy is provided, has that control is simple, response speed is fast, production cost is low, can realize the advantage by the seamless switching that is rectified to inversion.
To achieve these goals, the utility model adopts following technical scheme:
A kind of novel electric vehicle charger based on the monocycle control strategy, comprise three phase mains, three phase mains is connected with the LCL filter, and the LCL filter is connected with the input of three-phase PWM power inverter main circuit, the dc output end of the three-phase PWM power inverter electric capacity that supports in parallel; Load simultaneously and discharge loop are in parallel with the dc output end of three-phase PWM power inverter by selector switch; The control system of three-phase PWM power inverter is gathered the current signal i of LCL filter inductance
Rn, LCL filter and three-phase PWM power inverter main circuit input the voltage signal v of tie point
RnAnd the d. c. voltage signal U that supports the capacitor C two ends
Dc, corresponding pulse switch signal is exported in the work of control three-phase PWM power inverter.
Described three-phase PWM power inverter major loop adopts the three-phase full-controlled bridge of being made up of a plurality of switching devices.
Described discharge loop comprises the series circuit of second load and direct current adjustable voltage.
The control system of described three-phase PWM power inverter comprises: a plurality of rest-set flip-flops, each rest-set flip-flop
End, Q end are all distinguished corresponding with the pulse switch signal of the upper and lower brachium pontis switching device of a brachium pontis; The R end of each rest-set flip-flop is connected with the output of corresponding comparator respectively, and its S end all is connected with the clock signal module; The forward end input signal of each comparator is by detecting current i
Rn, detect voltage v
RnWith 1/R
fModule, R
sModule interconnects and obtains, and the negative end input signal is sawtooth signal; Described sawtooth signal is by error signal V
mWith V
mThe superimposed generation of signal through the integrator generation; Described error signal V
mBe reference voltage and dc voltage U
DcDifference through the output signal of pi regulator.
Described sawtooth waveforms carrier signal is V
m(1-t/ τ), t are time signal, and τ is time constant of integrator, gets τ=0.5T
s, T
sBe switch periods.
Described detection current i
Rn, detect voltage v
RnWith 1/R
fModule, R
sThe interconnected relationship of module is: voltage signal v
RnMultiply by gain 1/R
f, obtain virtual current signal i
NfVirtual current i
NfMultiply by gain R
sObtain R
si
NfCurrent signal multiply by gain R
sObtain R
si
RnR
si
NfAnd R
si
RnThe superimposed comparison signal R that obtains
si
NO, i
NO=i
Nf+ i
Rn
Described gain 1/R
fIn R
fBe the adjustable electric resistance, described gain 1/R
fIn R
sBe three phase mains equivalent internal resistance value.
The beneficial effects of the utility model:
1. the charging electric vehicle machine adopts the three-phase PWM power inverter, have advantages such as current on line side sine, power factor height, energy two-way flow, can effectively suppress current harmonics, both can realize being under the normal mode charging electric vehicle, can when the network load peak, the electric energy feedback grid have been realized peak load shifting again.
2. adopt improved monocycle control strategy, have the dual-use function of modulation and control, simple in structure, cost is low, and neither need to divide 60 ° of control intervals and also need not to increase logic control circuits such as interval selection circuit, control method realizes more easy.
3. in three-phase PWM power inverter monocycle control system, introduce electric voltage feed forward control, and by regulating adjustable resistance R
fProduce virtual current, can realize being switched to the smooth and seamless of inverter mode by the rectification pattern.
Description of drawings
Fig. 1 is three-phase PWM power inverter main circuit topological structure;
Fig. 2 is the control system block diagram of improved three-phase PWM power inverter;
The switching signal that Fig. 3 compares with sawtooth waveforms and produces for virtual current and the stack of detection electric current;
The Bode diagram that Fig. 4 draws for the LCL filter parameter;
Fig. 5 is three-phase PWM power inverter A phase voltage, electric current and dc voltage;
A phase voltage, electric current and dc voltage when Fig. 6 uprushes 50 Ω for load by 25 Ω;
Fig. 7 be the three-phase PWM power inverter by the rectification mode transition to inverter mode.
Wherein, 1. three phase mains; 2.LCL filter; 3. three-phase full-controlled bridge; 4. support electric capacity; 5. selector switch; 6. first load; 7. second load; 8. direct current adjustable voltage; 9.PI adjuster; 10. integrator; 11. comparator; 12.RS trigger; 13. clock signal module; 14.1/R
fModule; 15.R
sModule.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, a kind of novel electric vehicle charger based on the monocycle control strategy, comprise three phase mains 1, three phase mains 1 is connected with LCL filter 2, LCL filter 2 is connected with the input of three-phase PWM power inverter main circuit, the dc output end of the three-phase PWM power inverter electric capacity 4 that supports in parallel; First load 6 simultaneously and discharge loop are in parallel with the dc output end of three-phase PWM power inverter by selector switch 5; The control system of three-phase PWM power inverter is gathered the current signal i of LCL filter 2 inductance
Rn, LCL filter 2 and the tie point of three-phase PWM power inverter main circuit input voltage signal v
RnAnd the d. c. voltage signal U that supports electric capacity 4 two ends
Dc, corresponding pulse switch signal is exported in the work of control three-phase PWM power inverter.
Described three-phase PWM power inverter major loop adopts the three-phase full-controlled bridge of being made up of a plurality of switching devices 3.
Described discharge loop comprises the series circuit of second load 7 and direct current adjustable voltage 8.
First load 6 inserted main circuits when selector switch 5 was connected with A in the switching circuit, and the three-phase PWM power inverter is operated in the rectification pattern, and charger is given charging electric vehicle; When selector switch 5 pointed to B by A, the series circuit of second load 7 and direct current adjustable voltage 8 inserted main circuit, and the three-phase PWM power inverter to inverter mode, with electric energy feedback grid is realized peak load shifting when being implemented in the network load peak by the rectification mode transition.
Described LCL filter three is symmetrical, comprises net side inductance L
s, rectification side inductance L
r, inductance side dead resistance R
r, filter capacitor C
f, capacitive side dead resistance R
cEach phase inductance L
rWith resistance R
rThe series connection, this series circuit one end is connected with three-phase full-controlled bridge 3 brachium pontis mid points, the other end respectively with inductance L
s, capacitor C
fWith resistance R
cSeries circuit connect; Inductance L
sThe other end and three phase mains 1 internal resistance R
sConnect; Capacitor C
fWith resistance R
cThe other end of series circuit and the capacitor C of other two-phases
fWith inductance R
cSeries circuit connect.
As shown in Figure 2, the control system of described three-phase PWM power inverter comprises: a plurality of rest-set flip-flops 12, each rest-set flip-flop 12
The pulse switch signal of the upper and lower brachium pontis switching device of end, the corresponding phase of Q end output; The R end of each rest-set flip-flop 12 is connected with the output of corresponding comparator 11 respectively, and its S end all is connected with clock signal module 13; The forward end input signal of comparator 11 is by detecting current i
Rn, detect voltage v
RnWith 1/R
fModule 14, R
sModule 15 interconnects and obtains, and the negative end input signal is sawtooth signal; Described sawtooth signal is by error signal V
mWith V
mThe superimposed generation of signal through integrator 10 generations; Described error signal V
mBe reference voltage and dc voltage U
DcDifference through the output signal of pi regulator 9.
Described sawtooth waveforms carrier signal is V
m(1-t/ τ), t are time signal, and τ is time constant of integrator, gets τ=0.5T
s, T
sBe switch periods.
Described detection current i
Rn, detect voltage v
RnWith 1/R
fModule 14, R
sThe interconnected relationship of module 15 is: voltage signal v
RnMultiply by gain 1/R
f, obtain virtual current signal i
NfVirtual current i
NfMultiply by gain R
sObtain R
si
NfCurrent signal multiply by gain R
sObtain R
si
RnR
si
NfAnd R
si
RnThe superimposed comparison signal R that obtains
si
NO, i
NO=i
Nf+ i
Rn
Described gain 1/R
fIn R
fBe the adjustable electric resistance, described gain R
sIn R
sBe three phase mains equivalent internal resistance value.
As shown in Figure 3, virtual current with detect compare with the sawtooth waveforms switching signal of generation of electric current sum and be:
In the formula, R
sBe three phase mains equivalent internal resistance, R
fBe adjustable resistance.
Also can be obtained by (1) formula: i
NO=i
Rn+ i
Nf
In addition,
In the formula, I
PABe A phase maximum phase current, I
PBBe B phase maximum phase current, I
PCBe C phase maximum phase current, t
2For A is conducted the time, t
3For C is conducted the time, K
3Be the carrier signal slope.
Then the variable quantity of A phase current is in the one-period:
In the formula, v
ABe A phase phase voltage, T
sBe switch periods, L
sNet side inductance for the LCL filter.
Because switching frequency is far longer than supply frequency, simultaneous formula (1)~(3) can obtain:
In the formula, i
ABe A phase phase current, U
DcBe the both end voltage of DC side support electric capacity 4, V
mError signal for pi regulator 9 outputs.
Its frequency-domain model is:
In the formula,
Be A phase phase current effective value,
Be A phase phase voltage effective value,
Be each phase phase current effective value.
Obtain the input current of Three-Phase PWM Rectifier:
In the formula,
Be each phase phase voltage effective value,
Be each phase phase current effective value.
By formula (6) as can be seen, when
The time, power inverter operates in rectification state, when
The time, power inverter operates in inverter mode, both can realize being under the normal mode charging electric vehicle, can when the network load peak electric energy feedback grid be realized peak load shifting again.
1.LCL filter design
Simple L filtering possibly can't be satisfied the electrical network requirement, and LCL filtering obtains extensive concern owing to have good filtering effect.Main circuit adopts LCL filter 2, ignores dead resistance R
sAnd R
r, its input and output transfer function is:
In the formula, V
rBe converter phase voltage first-harmonic peak value, L
rBe the rectification side inductance of LCL filter, R
rBe the inductance side dead resistance of LCL filter, C
fBe the filter capacitor of LCL filter, R
cCapacitive side dead resistance for the LCL filter.
The resonance frequency of LCL system is:
Obtain the transducer side inductance L by empirical equation
rFor:
In the formula, Δ i
MaxBe the largest ripple current of harmonic current, be generally 10%~20% of rated current, f
kBe switching frequency.
In addition, L
sBe generally L
r0~1 times.
Filter capacitor C
fFor:
In the formula, P is power output, and f is supply frequency.
In addition, the filter inductance and the electric capacity that adopt in the monocycle control strategy should be as far as possible little, to reduce system's reactive loss.
As shown in Figure 4, select four groups of LCL parameters as shown in table 1 according to mentioned above principle, and draw corresponding Bode diagram and compare analysis.Clearly LCL filtering has more obvious inhibition than independent L filtering for current harmonics, and the inductance value is much smaller.
Table 1LCL filter parameter
Sequence number | C f(μf) | L s(mH) | L r(mH) | R s(Ω) | R r(Ω) |
a | 25 | 2.0 | 2.0 | 0.25 | 0.25 |
b | 25 | 2.5 | 1.5 | 0.3 | 0.2 |
c | 25 | 1 | 2.5 | 0.15 | 0.3 |
|
0 | 2 | 2 | 0.25 | 0.25 |
2. emulation experiment
The utility model is by the PSCAD simulation software, the novel electric vehicle charger system based on the monocycle control strategy that the utility model proposes has been carried out simulating, verifying, and simulation result contrasted and analyze, only with part result of calculation correctness of the present utility model and validity are described below.
Built three-phase PWM power inverter simulation model in the PSCAD analogue system, the system emulation parameter is as shown in table 2.
Table 2 system emulation parameter
Circuit | Parameter |
Switching frequency | 10kHz |
Dc bus capacitor | 1980μf |
Load resistance | 25Ω |
The power supply phase voltage | 400V |
Supply frequency | 50Hz |
Dc voltage | 700V |
As shown in Figure 5, the waveform of three-phase PWM power inverter A phase voltage, electric current and dc voltage during for stable state, current waveform (having amplified 3 times) near sinusoidal as can be seen, dc voltage stability, utilize among the PSCAD FFT module to analyze, phase current THD is 2.13%, and power factor is 0.993, has realized the control target of unity power factor substantially.
As shown in Figure 6, be that checking improves the dynamic property of control scheme, first load 6 be set by 25 Ω, 50 Ω that uprush, observe output waveform, A phase current sinuso sine protractor is still good as can be seen, and dc voltage tended towards stability about 2 cycles, and system can realize a smooth transition substantially.
As shown in Figure 7, the selector switch 5 of DC side points to B by A in main circuit, adjusts direct current adjustable voltage 8 simultaneously, the three-phase PWM power inverter by the rectification mode transition to inverter mode.When 3S, selector switch 5 points to B by A, and system finished by the seamless switching of rectification pattern to inverter mode through about 3 cycles, had realized the bi-directional of power.
Though above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (7)
1. novel electric vehicle charger based on the monocycle control strategy, it is characterized in that, comprise three phase mains, three phase mains is connected with the LCL filter, the LCL filter is connected with the input of three-phase PWM power inverter main circuit, the dc output end of the three-phase PWM power inverter electric capacity that supports in parallel; First load simultaneously and discharge loop are in parallel with the dc output end of three-phase PWM power inverter by selector switch; The control system of three-phase PWM power inverter is gathered the current signal i of LCL filter inductance
Rn, LCL filter and three-phase PWM power inverter main circuit input the voltage signal v of tie point
RnAnd the d. c. voltage signal U that supports the capacitor C two ends
Dc, corresponding pulse switch signal is exported in the work of control three-phase PWM power inverter.
2. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 1 is characterized in that, described three-phase PWM power inverter major loop adopts the three-phase full-controlled bridge of being made up of a plurality of switching devices.
3. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 1 is characterized in that described discharge loop comprises the series circuit of second load and direct current adjustable voltage.
4. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 1 is characterized in that the control system of described three-phase PWM power inverter comprises: a plurality of rest-set flip-flops, each rest-set flip-flop
End, Q end are all distinguished corresponding with the pulse switch signal of the upper and lower brachium pontis switching device of a brachium pontis; The R end of each rest-set flip-flop is connected with the output of corresponding comparator respectively, and its S end all is connected with the clock signal module; The forward end input signal of each comparator is by detecting current i
Rn, detect voltage v
RnWith 1/R
fModule, R
sModule interconnects and obtains, and the negative end input signal is sawtooth signal; Described sawtooth signal is by error signal V
mWith V
mThe superimposed generation of signal through the integrator generation; Described error signal V
mBe reference voltage and dc voltage U
DcDifference through the output signal of pi regulator.
5. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 4 is characterized in that described sawtooth waveforms carrier signal is V
m(1-t/ τ), t are time signal, and τ is time constant of integrator, gets τ=0.5T
s, T
sBe switch periods.
6. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 4 is characterized in that described detection current i
Rn, detect voltage v
RnWith 1/R
fModule, R
sThe interconnected relationship of module is: voltage signal v
RnMultiply by gain 1/R
f, obtain virtual current signal i
NfVirtual current i
NfMultiply by gain R
sObtain R
si
NfCurrent signal multiply by gain R
sObtain R
si
RnR
si
NfAnd R
si
RnThe superimposed comparison signal R that obtains
si
NO, i
NO=i
Nf+ i
Rn
7. a kind of novel electric vehicle charger based on the monocycle control strategy as claimed in claim 6 is characterized in that, described gain 1/R
fIn R
fBe the adjustable electric resistance, described gain 1/R
fIn R
sBe three phase mains equivalent internal resistance value.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103248106A (en) * | 2013-05-09 | 2013-08-14 | 国家电网公司 | Novel electric automobile battery charger based on single-cycle control strategy |
GB2591724A (en) * | 2019-11-25 | 2021-08-11 | Cambridge Entpr Ltd | A charger |
-
2013
- 2013-05-09 CN CN 201320249434 patent/CN203218946U/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103248106A (en) * | 2013-05-09 | 2013-08-14 | 国家电网公司 | Novel electric automobile battery charger based on single-cycle control strategy |
CN103248106B (en) * | 2013-05-09 | 2014-10-15 | 国家电网公司 | Novel electric automobile battery charger based on single-cycle control strategy |
GB2591724A (en) * | 2019-11-25 | 2021-08-11 | Cambridge Entpr Ltd | A charger |
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