CN107394818B - Energy storage battery grid-connected operation control method and device based on energy storage converter - Google Patents

Energy storage battery grid-connected operation control method and device based on energy storage converter Download PDF

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CN107394818B
CN107394818B CN201710680928.2A CN201710680928A CN107394818B CN 107394818 B CN107394818 B CN 107394818B CN 201710680928 A CN201710680928 A CN 201710680928A CN 107394818 B CN107394818 B CN 107394818B
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energy storage
grid
reference value
storage battery
converter
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CN107394818A (en
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李建林
薛宇石
徐少华
惠东
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Shaanxi Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
Electric Power Research Institute of State Grid Shaanxi Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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Abstract

The invention provides an energy storage battery grid-connected operation control method and device based on an energy storage converter, which comprises the steps of firstly calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter; then calculating a grid-connected current reference value of the energy storage battery; and finally, determining a modulation wave signal of the energy storage battery, and modulating the modulation wave signal through SPWM (sinusoidal pulse width modulation), so as to obtain a switching signal for controlling the energy storage converter, and realize grid-connected operation control of the energy storage battery. The invention realizes the grid-connected operation control of the energy storage battery, the harmonic content in the grid-connected current of the energy storage battery is less, the grid-connected voltage of the energy storage battery cannot be deteriorated, and the control effect is better; the control of the active power and the reactive power output by the energy storage converter is realized, and under the weak grid environment with poor grid-connected voltage quality, the grid-connected current can still be kept as a sine wave with good quality, so that the voltage quality of the grid is prevented from being further reduced.

Description

Energy storage battery grid-connected operation control method and device based on energy storage converter
Technical Field
The invention relates to an energy storage operation control technology, in particular to an energy storage battery grid-connected operation control method and device based on an energy storage converter.
Background
The renewable energy source has volatility and intermittence, so that output fluctuation of the renewable energy source needs to be stabilized through an energy storage technology, and the energy storage battery has the characteristics of high energy, flexibility in installation and high charging and discharging speed, and becomes one of the preferential development directions. Energy is generally converted into sinusoidal alternating current that can be received by a power grid through a Power Converter (PCS), so that grid-connected operation of the energy storage battery is realized.
At present, the most common energy storage battery grid-connected operation control strategy is PQ decoupling control, and the PQ decoupling control specifically comprises the following processes: firstly, acquiring three-phase grid-connected point voltage information, obtaining grid-connected voltage angular frequency omega through a phase-locked loop, and then carrying out dq conversion on the grid-connected voltage based on omega to respectively obtain d-axis and q-axis direct-current components of the grid-connected voltage; then, grid-connected current reference values of a d axis and a q axis can be calculated according to the power reference value, and then the PI controller is used for tracking the reference values of the current; and finally, calculating a three-phase modulation wave by dq inverse transformation, and modulating and outputting a switching signal by SPWM to control the inverter. However, when the distortion rate of the grid-connected point voltage is high, errors may be generated by phase-locked loops and dq conversion, the grid-connected current harmonic content is increased under the traditional PQ decoupling control, grid-connected voltage is further deteriorated, and the grid-connected operation control effect on the energy storage battery is poor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the energy storage battery grid-connected operation control method and device based on the energy storage converter.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the invention provides an energy storage battery grid-connected operation control method based on an energy storage converter, which comprises the following steps:
calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter;
and determining a modulation wave signal of the energy storage battery according to the grid-connected current reference value of the energy storage battery, and modulating the modulation wave signal through the SPWM.
The complex power reference value of the energy storage converter is calculated according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
the power factor reference value of the energy storage converter is calculated according to the following formula:
Figure BDA0001375438890000021
wherein the content of the first and second substances,
Figure BDA0001375438890000022
represents the power factor reference value of the energy storage converter,
Figure BDA0001375438890000023
representing the power factor angle reference of the energy storage converter.
The complex power of the energy storage converter is calculated according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure BDA0001375438890000024
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
the power factor of the energy storage converter is calculated according to the following formula:
Figure BDA0001375438890000025
wherein the content of the first and second substances,
Figure BDA0001375438890000026
the power factor of the energy storage converter is represented,
Figure BDA0001375438890000027
representing the power factor angle of the energy storage converter.
The grid-connected current reference value of the energy storage battery is calculated according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure BDA0001375438890000031
Figure BDA0001375438890000032
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure BDA0001375438890000033
wherein, TsRepresents a sampling time interval; kp1、Kp2Denotes a proportionality coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。
The modulation wave signal of the energy storage battery is determined according to the grid-connected current reference value of the energy storage battery according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure BDA0001375438890000034
c represents filter capacitor in LCL filterThe capacity value of (c); kCRepresents a capacitance current feedback coefficient, and
Figure BDA0001375438890000035
L1representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side.
The modulating the modulated wave signal by the SPWM comprises:
taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter;
and adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
The invention also provides an energy storage battery grid-connected operation control device based on the energy storage converter, which comprises the following components:
the first calculation module is used for calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
the second calculation module is used for calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter;
and the modulation module is used for determining a modulation wave signal of the energy storage battery according to the grid-connected current reference value of the energy storage battery and modulating the modulation wave signal through SPWM.
The first calculation module calculates a complex power reference value of the energy storage converter according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
the first calculation module calculates a power factor reference value of the energy storage converter according to the following formula:
Figure BDA0001375438890000041
wherein the content of the first and second substances,
Figure BDA0001375438890000042
represents the power factor reference value of the energy storage converter,
Figure BDA0001375438890000043
representing the power factor angle reference of the energy storage converter.
The first calculation module calculates the complex power of the energy storage converter according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure BDA0001375438890000044
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
the first calculation module calculates the power factor of the energy storage converter according to the following formula:
Figure BDA0001375438890000045
wherein the content of the first and second substances,
Figure BDA0001375438890000046
the power factor of the energy storage converter is represented,
Figure BDA0001375438890000047
representing the power factor angle of the energy storage converter.
The second calculation module calculates a grid-connected current reference value of the energy storage battery according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure BDA0001375438890000051
Figure BDA0001375438890000052
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure BDA0001375438890000053
wherein, TsRepresents a sampling time interval; kp1、Kp2Denotes a proportionality coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。
The modulation module comprises a determination unit, and the determination unit determines a modulation wave signal of the energy storage battery according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure BDA0001375438890000054
c represents the capacitance value of a filter capacitor in the LCL filter; kCRepresents a capacitance current feedback coefficient, and
Figure BDA0001375438890000055
L1representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side.
The modulation module further includes a modulation unit, and the modulation unit is specifically configured to:
taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter;
and adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the energy storage battery grid-connected operation control method based on the energy storage converter calculates a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter; then calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter; finally, a modulation wave signal of the energy storage battery is determined according to a grid-connected current reference value of the energy storage battery, and the modulation wave signal is modulated through SPWM (sinusoidal pulse width modulation), so that a switching signal for controlling the energy storage converter is obtained, and grid-connected operation control of the energy storage battery is realized;
according to the energy storage battery grid-connected operation control method based on the energy storage converter, the energy storage battery grid-connected operation control is realized through the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter, the harmonic content in the grid-connected current of the energy storage battery is low, the grid-connected voltage of the energy storage battery cannot be deteriorated, and the control effect is good;
the energy storage battery grid-connected operation control method based on the energy storage converter provided by the invention realizes the control of the active power and the reactive power output by the energy storage converter, and under the weak grid environment with poor grid-connected voltage quality, the grid-connected current can still be kept as a sine wave with better quality, thereby avoiding further reducing the grid voltage quality.
Drawings
FIG. 1 is a block diagram of an energy storage converter in an embodiment of the invention;
FIG. 2 is a flow chart of a method for controlling grid-connected operation of an energy storage battery based on an energy storage converter in the embodiment of the invention;
FIG. 3 is a flowchart of calculating a grid-connected current reference value according to an embodiment of the present invention;
FIG. 4 is a flow chart of a modulated wave signal for determining a storage battery according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of grid-connected voltage of an energy storage battery according to an embodiment of the invention;
FIG. 6 is a schematic diagram of grid-connected current of an energy storage battery according to an embodiment of the present invention;
fig. 7 is a schematic diagram of active power and reactive power output by the energy storage converter in the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention provides an energy storage battery grid-connected operation control method based on an energy storage converter, wherein the structural diagram of the energy storage converter is shown in fig. 1, the energy storage converter comprises an inverter and an LCL filter, the inverter comprises a T1, a T2, a T3, a T4, a T5 and a T6, and the LCL filter comprises an inverter side filter inductor L1, a filter capacitor C and a grid side filter inductor L2. Examples of the inventionAnd generating a grid-connected current reference value of the energy storage battery by adopting the angle between the energy storage converter and the power factor angle, and realizing PCS to output given active power and reactive power through grid-connected current closed-loop control. The complex power S output by the PCS is only related to the amplitude of grid-connected voltage and grid-connected current of the energy storage battery, and the output reactive power Q depends on
Figure BDA0001375438890000061
If the phase of the grid-connected current is the same as the grid-connected voltage, i.e.
Figure BDA0001375438890000071
Then the reactive power output by the PCS at this time will be 0. When both S and Q are determined, the active power P can also be determined, as can be seen by comparing the complex power S and the power factor angle
Figure BDA0001375438890000072
Can determine the grid-connected current reference value so as to realize the output of given active power and reactive power, and when the grid frequency changes, changes
Figure BDA0001375438890000073
And the tracking can be carried out in time, and the frequency deviation can not occur.
The flow chart of the energy storage battery grid-connected operation control method based on the energy storage converter provided by the embodiment of the invention is shown in fig. 2, and the specific process is as follows:
s101: calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
s102: calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter calculated in the step S101;
s103: and determining a modulation wave signal of the energy storage battery according to the grid-connected current reference value of the energy storage battery calculated in S102, and modulating the modulation wave signal through SPWM.
In S101, the complex power reference value of the energy storage converter is calculated according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
in the above S101, the power factor reference value of the energy storage converter is calculated according to the following formula:
Figure BDA0001375438890000074
wherein the content of the first and second substances,
Figure BDA0001375438890000075
represents the power factor reference value of the energy storage converter,
Figure BDA0001375438890000076
representing the power factor angle reference of the energy storage converter.
In S101, the complex power of the energy storage converter is calculated according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure BDA0001375438890000077
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
in S101, the power factor of the energy storage converter is calculated according to the following formula:
Figure BDA0001375438890000081
wherein the content of the first and second substances,
Figure BDA0001375438890000082
the power factor of the energy storage converter is represented,
Figure BDA0001375438890000083
representing the power factor angle of the energy storage converter.
As shown in fig. 3, the grid-connected current reference value calculated in S102 is calculated according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter, and the grid-connected current reference value of the energy storage battery is calculated according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure BDA0001375438890000084
Figure BDA0001375438890000085
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure BDA0001375438890000086
wherein, TsRepresents a sampling time interval; kp1、Kp2Presentation ratioExample coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。Kp1、Kp2The larger the response speed, the faster the control accuracy becomes, but Ki1、Ki2The larger the response speed to a change in the power reference value, but with an overshoot, if Kp1、Kp2、Ki1、Ki2The values are respectively taken in the respective ranges, so that the method has better response speed and control effect.
After the grid-connected current reference value is given, closed-loop control needs to be performed on the grid-connected current reference value so as to realize that the PCS outputs corresponding grid-connected current. In the method, the power reference value can be tracked without difference due to the existence of the PI controller, so that the PCS can output the given reference current only by one proportion link in the closed-loop control link of the grid-connected current. Therefore, the modulated wave signal of the energy storage battery determined in S103 is as shown in fig. 4, and the modulated wave signal of the energy storage battery determined according to the grid-connected current reference value of the energy storage battery is determined according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure BDA0001375438890000091
c represents the capacitance value of a filter capacitor in the LCL filter; kCRepresents a capacitance current feedback coefficient, and
Figure BDA0001375438890000092
L1representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side. The larger the K value, the faster the response speed, but the control effect is reduced, if K, KCThe values are respectively taken within the value ranges, so that the method has good response speed and control effect.
In the above S103, the specific process of modulating the modulated wave signal by the SPWM is as follows:
firstly, taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter; the following two cases are specifically distinguished:
when W isaIf the amplitude is larger than the amplitude of the triangular wave, T1 in the figure 1 is closed and T2 is opened, otherwise T2 in the figure 1 is closed and T1 is opened; in the same way, when WbIf the amplitude is larger than the amplitude of the triangular wave, T3 in the figure 1 is closed and T4 is opened, otherwise T4 in the figure 1 is closed and T3 is opened; when W iscAbove the amplitude of the triangle wave, T5 in fig. 1 closes and T6 opens, otherwise T6 in fig. 1 closes and T5 opens.
And then adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
The parameters of a 500kW energy storage converter are as follows: the filter inductance L1 on the inverter side in the LCL filter is 0.24mH, the filter inductance L2 on the grid side in the LCL filter is 0.08mH, the filter capacitance C in the LCL filter is 220 μ F, the switching frequency of the SPWM modulation is 5kHz, the grid-connected voltage contains higher 11 th and 13 th harmonics, the waveform distortion rate is 5.8%, and K is equal top1＝10-4，Ki1＝1，Kp2＝10-3，Ki2＝20，K＝0.9，KCAnd the active power reference value of the energy storage converter is 300kW, and the reactive power reference value is 100 kW. The control results are shown in fig. 5-7, fig. 5 is a schematic diagram of grid-connected voltage of the energy storage battery, fig. 6 is a schematic diagram of grid-connected current of the energy storage battery, and fig. 7 is a schematic diagram of active power and reactive power output by the energy storage converter in one period. As can be seen from FIGS. 5-7, the grid-connected voltage has obvious harmonic waves, and the grid-connected powerThe current harmonic content is low, and even if the control method provided by the embodiment of the invention is used, the sinusoidal current with good waveform quality can be output when the grid-connected voltage quality is poor.
Based on the same invention concept, the embodiment of the invention also provides an energy storage battery grid-connected operation control device based on the energy storage converter, the principle of solving the problems of the devices is similar to the energy storage battery grid-connected operation control method based on the energy storage converter, the energy storage battery grid-connected operation control device based on the energy storage converter mainly comprises a first calculating module, a second calculating module and a modulating module, and the functions of the three modules are respectively introduced as follows:
the first calculation module is mainly used for calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
the second calculation module is mainly used for calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter;
the modulation module is mainly used for determining a modulation wave signal of the energy storage battery according to a grid-connected current reference value of the energy storage battery and modulating the modulation wave signal through SPWM.
The first calculating module calculates a complex power reference value of the energy storage converter according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
the first calculating module calculates the power factor reference value of the energy storage converter according to the following formula:
Figure BDA0001375438890000101
wherein the content of the first and second substances,
Figure BDA0001375438890000102
represents the power factor reference value of the energy storage converter,
Figure BDA0001375438890000103
representing the power factor angle reference of the energy storage converter.
The first calculating module calculates the complex power of the energy storage converter according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure BDA0001375438890000104
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
the first calculating module calculates the power factor of the energy storage converter according to the following formula:
Figure BDA0001375438890000111
wherein the content of the first and second substances,
Figure BDA0001375438890000112
the power factor of the energy storage converter is represented,
Figure BDA0001375438890000113
representing the power factor angle of the energy storage converter.
The second calculating module calculates a grid-connected current reference value of the energy storage battery according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure BDA0001375438890000114
Figure BDA0001375438890000115
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure BDA0001375438890000116
wherein, TsRepresents a sampling time interval; kp1、Kp2Denotes a proportionality coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。
The modulation module comprises a determination unit, and the determination unit determines the modulation wave signal of the energy storage battery according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure BDA0001375438890000117
c represents the capacitance value of a filter capacitor in the LCL filter; kCRepresents a capacitance current feedback coefficient, and
Figure BDA0001375438890000118
L1representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side.
The modulation module further comprises a modulation unit, and the specific process of modulating the modulation wave signal by the modulation unit through the SPWM is as follows:
firstly, taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter;
and adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware when implementing the present application.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.

Claims (6)

1. An energy storage battery grid-connected operation control method based on an energy storage converter is characterized by comprising the following steps:
calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter;
determining a modulation wave signal of the energy storage battery according to a grid-connected current reference value of the energy storage battery, and modulating the modulation wave signal through SPWM;
the complex power reference value of the energy storage converter is calculated according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
the power factor reference value of the energy storage converter is calculated according to the following formula:
Figure FDA0002885058240000011
wherein the content of the first and second substances,
Figure FDA0002885058240000012
represents the power factor reference value of the energy storage converter,
Figure FDA0002885058240000013
representing a power factor angle reference value of the energy storage converter;
the complex power of the energy storage converter is calculated according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure FDA0002885058240000014
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
the power factor of the energy storage converter is calculated according to the following formula:
Figure FDA0002885058240000015
wherein the content of the first and second substances,
Figure FDA0002885058240000021
the power factor of the energy storage converter is represented,
Figure FDA0002885058240000022
representing the power factor angle of the energy storage converter;
the grid-connected current reference value of the energy storage battery is calculated according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure FDA0002885058240000023
Figure FDA0002885058240000024
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure FDA0002885058240000025
wherein, TsRepresents a sampling time interval; kp1、Kp2Denotes a proportionality coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。
2. The energy storage battery grid-connected operation control method based on the energy storage converter as claimed in claim 1, wherein the modulation wave signal of the energy storage battery determined according to the grid-connected current reference value of the energy storage battery is determined according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure FDA0002885058240000026
c represents the capacitance value of a filter capacitor in the LCL filter; kCRepresents the feedback coefficient of the capacitance current and,and is
Figure FDA0002885058240000027
L1Representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side.
3. The energy storage converter-based grid-connected operation control method for the energy storage battery as claimed in claim 2, wherein the modulating wave signal by the SPWM comprises:
taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter;
and adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
4. The utility model provides an energy storage battery operation controlling means that is incorporated into power networks based on energy storage converter which characterized in that includes:
the first calculation module is used for calculating a complex power reference value, a power factor reference value, complex power and a power factor of the energy storage converter;
the second calculation module is used for calculating a grid-connected current reference value of the energy storage battery according to the complex power reference value, the power factor reference value, the complex power and the power factor of the energy storage converter;
the modulation module is used for determining a modulation wave signal of the energy storage battery according to the grid-connected current reference value of the energy storage battery and modulating the modulation wave signal through SPWM;
the first calculation module calculates a complex power reference value of the energy storage converter according to the following formula:
Sref＝Pref+jQref
wherein S isrefRepresenting the complex power reference, P, of the energy-storing converterrefRepresenting the active power reference, Q, of the output of the energy-storing converterrefThe reactive power reference value output by the energy storage converter is represented, and j represents an imaginary number unit;
the first calculation module calculates a power factor reference value of the energy storage converter according to the following formula:
Figure FDA0002885058240000031
wherein the content of the first and second substances,
Figure FDA0002885058240000032
represents the power factor reference value of the energy storage converter,
Figure FDA0002885058240000033
representing a power factor angle reference value of the energy storage converter;
the first calculation module calculates the complex power of the energy storage converter according to the following formula:
S＝P+jQ
wherein, S represents the complex power output by the energy storage converter, P represents the active power output by the energy storage converter, Q represents the reactive power output by the energy storage converter, and P, Q are respectively calculated according to the following formula:
P＝UaIa+UbIb+UcIc
Figure FDA0002885058240000034
wherein, UaAnd IaRespectively representing A-phase grid-connected voltage and grid-connected current, U of the energy storage batterybAnd IbRespectively representing B-phase grid-connected voltage and grid-connected current, U of the energy storage batterycAnd IcRespectively representing C-phase grid-connected voltage and grid-connected current of the energy storage battery;
the first calculation module calculates the power factor of the energy storage converter according to the following formula:
Figure FDA0002885058240000041
wherein the content of the first and second substances,
Figure FDA0002885058240000042
the power factor of the energy storage converter is represented,
Figure FDA0002885058240000043
representing the power factor angle of the energy storage converter;
the second calculation module calculates a grid-connected current reference value of the energy storage battery according to the following formula:
Iaref＝Mag·sin(100πt+θ)
Figure FDA0002885058240000044
Figure FDA0002885058240000045
wherein, Iaref、Ibref、IcrefA, B, C phase grid current reference values of the energy storage batteries are respectively represented, t represents time, Mag represents the amplitude of the grid-connected current reference value of the energy storage batteries, theta represents the phase of the grid-connected current reference value of the energy storage batteries, and Mag and theta are respectively calculated according to the following formula:
Mag＝(Sref-S)(Kp1+Ki1·Ts)
Figure FDA0002885058240000046
wherein, TsRepresents a sampling time interval; kp1、Kp2Denotes a proportionality coefficient, and Kp1＝1×10-4～1×10-3，Kp2＝1×10-4～1×10-3；Ki1、Ki2Represents an integral coefficient, and Ki1＝1～5，Ki2＝10～30。
5. The energy storage battery grid-connected operation control device based on the energy storage converter as claimed in claim 4, wherein the modulation module comprises a determination unit, and the determination unit determines the modulation wave signal of the energy storage battery according to the following formula:
Wa＝(Iaref-Ia)·K-ICaKC
Wb＝(Ibref-Ib)·K-ICbKC
Wc＝(Icref-Ic)·K-ICcKC
wherein, Wa、Wb、WcA, B, C phase modulation wave signals respectively representing energy storage batteries; i isCa、ICb、ICcA, B, C phase currents respectively representing filter capacitors; k represents a proportionality coefficient, and
Figure FDA0002885058240000047
c represents the capacitance value of a filter capacitor in the LCL filter; kCRepresents a capacitance current feedback coefficient, and
Figure FDA0002885058240000051
L1representing the filter inductance, L, on the inverter side2Representing the filter inductance on the grid side.
6. The energy storage battery grid-connected operation control device based on the energy storage converter as claimed in claim 5, wherein the modulation module further comprises a modulation unit, and the modulation unit is specifically configured to:
taking one half of the amplitude of the voltage on the direct current side of the energy storage battery as the amplitude of the triangular wave, and taking the triangular wave and the W as the amplitude of the triangular wavea、Wb、WcComparing to obtain a switching signal for controlling the energy storage converter;
and adjusting the grid-connected current of the energy storage battery according to the switching signal of the energy storage converter.
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