CN112350330A - Method for inhibiting voltage fluctuation of alternating current side of energy storage inverter - Google Patents

Method for inhibiting voltage fluctuation of alternating current side of energy storage inverter Download PDF

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CN112350330A
CN112350330A CN202011315253.XA CN202011315253A CN112350330A CN 112350330 A CN112350330 A CN 112350330A CN 202011315253 A CN202011315253 A CN 202011315253A CN 112350330 A CN112350330 A CN 112350330A
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energy storage
storage inverter
voltage
fluctuation
alternating current
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杨沛豪
孙钢虎
兀鹏越
柴琦
王小辉
寇水潮
高峰
姜宁
郭新宇
孙梦瑶
李志鹏
赵俊博
薛磊
贺婷
郭霞
张立松
潘海波
王文强
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a method for inhibiting voltage fluctuation of an alternating current side of an energy storage inverter, which comprises the following steps: establishing a power transmission equation of the energy storage inverter; simplifying an equation; constructing a state equation of the energy storage inverter; obtaining an alternating-current side bus voltage fluctuation expression of the energy storage inverter; decomposing a bus voltage fluctuation expression at the alternating current side of the energy storage inverter into an expansion form; the method comprises the steps of expanding a tapping expansion of an alternating-current side bus voltage fluctuation expression of an energy storage inverter into a time domain expression overlapped by cosine current signals and sine current signals; constructing a voltage disturbance suppressor of the energy storage inverter; the output voltage of the voltage disturbance suppressor of the energy storage inverter device is used as a reference signal and added into a voltage control loop, so that the voltage regulation performance of the energy storage inverter device is improved, and the voltage fluctuation of an alternating current side is suppressed. According to the invention, the disturbance suppressor is added in the voltage control system of the energy storage inverter device to improve the voltage control capability of the energy storage inverter device.

Description

Method for inhibiting voltage fluctuation of alternating current side of energy storage inverter
Technical Field
The invention relates to a method for inhibiting voltage fluctuation of an alternating current side of an energy storage inverter.
Background
The capacity of a power grid is continuously increased, the structure of a regional power grid becomes complex, and a micro-grid formed by high-permeability distributed power supply points such as photovoltaic power, wind power and the like has the influence on the frequency stability of the large power grid due to the characteristics of low inertia and low damping. The energy storage unit is used as a power supply capable of being charged and discharged flexibly, can realize self-adaptive energy absorption and release in a power grid, and has the advantages of replacement or not in maintaining the voltage stability of the power grid due to quick response and flexible control.
However, when the energy storage device operates in a network, the ac side voltage of the energy storage inverter is susceptible to load power fluctuation and other factors due to the output randomness of other renewable power supply points. How to reasonably control the voltage of the alternating current side of the energy storage inverter, maintain the voltage stability of the alternating current side, and avoid bus voltage fluctuation caused by power fluctuation and uncertain system parameters becomes a recent research hotspot.
Disclosure of Invention
The invention aims to provide a method for inhibiting voltage fluctuation of an alternating current side of an energy storage inverter.
The invention is realized by adopting the following technical scheme:
a method for inhibiting voltage fluctuation of an alternating current side of an energy storage inverter comprises the following steps:
1) establishing a power transmission equation of the energy storage inverter;
2) simplifying the power transmission equation of the energy storage inverter in the step 1) according to the internal parameter properties of the energy storage inverter;
3) obtaining an alternating current dynamic equation of the energy storage inverter device according to the power transmission simplification equation of the energy storage inverter device obtained in the step 2);
4) constructing an energy storage inverter state equation according to the alternating current dynamic equation of the energy storage inverter in the step 3) and introducing a compensation disturbance term;
5) in order to effectively restrain the fluctuation of the bus voltage of the energy storage inverter, the fluctuation of the bus voltage is divided into: obtaining an alternating-current side bus voltage fluctuation expression of the energy storage inverter according to the state equation of the energy storage inverter in the step 4) under the influence of power fluctuation on voltage dynamic response and voltage distribution deviation caused by uncertain system parameters;
6) decomposing the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter obtained in the step 5) into an expansion form;
7) according to the load side current time domain expression, expanding the energy storage inverter AC side bus voltage fluctuation expression in the step 6) into a time domain expression overlapped by cosine current signals and sine current signals;
8) regarding the voltage distribution deviation as direct current quantity, and constructing a voltage disturbance suppressor of the energy storage inverter according to the bus voltage fluctuation expression in the step 5);
9) and (3) adding the output voltage of the voltage disturbance suppressor of the energy storage inverter device obtained in the step 8) into a voltage control loop as a reference signal, so that the voltage regulation performance of the energy storage inverter device is improved, and the voltage fluctuation of an alternating current side is suppressed.
The further improvement of the invention is that the specific implementation method of the step 1) is as follows: establishing a power transmission equation of the energy storage inverter:
Figure BDA0002791150530000021
wherein: rf、XfThe resistance value and the inductive reactance value of the filter circuit; u shapeacThe voltage of the alternating current side of the energy storage inverter is obtained; e.g. of the type0Is the net side voltage; delta is the power angle difference.
The further improvement of the invention is that the specific implementation method of the step 2) is as follows: according to the internal parameter properties of the energy storage inverter: rf＜＜XfSimplifying the power transmission equation of the energy storage inverter in the step 1):
Figure BDA0002791150530000022
the further improvement of the invention is that the specific implementation method of the step 3) is as follows: obtaining an alternating current dynamic equation of the energy storage inverter device according to the energy storage inverter device power transmission simplification equation obtained in the step 2)：
Figure BDA0002791150530000031
Wherein: l isfIs the filter inductance value; cfIs a filter capacitance value; i.e. i0Is the net side current; i.e. iacAnd outputting current to the alternating current side of the energy storage inverter.
The further improvement of the invention is that the specific implementation method of the step 4) is as follows: according to the alternating current dynamic equation of the energy storage inverter in the step 3), introducing a compensation disturbance term w (t) and constructing an energy storage inverter state equation:
Figure BDA0002791150530000032
wherein:
Figure BDA0002791150530000033
the further improvement of the invention is that the concrete implementation method of the step 5) is as follows: in order to effectively restrain the fluctuation of the bus voltage of the energy storage inverter, the fluctuation of the bus voltage is divided into: and (3) obtaining an alternating-current side bus voltage fluctuation expression of the energy storage inverter according to the state equation of the energy storage inverter in the step 4) under the influence of power fluctuation on voltage dynamic response and voltage distribution deviation caused by uncertain system parameters:
Figure BDA0002791150530000034
wherein: d (t) represents the influence of power fluctuation caused by load change on the network side and output adjustment of the distributed power supply point on the dynamic response of the voltage; and delta psi (t) represents the voltage distribution deviation caused by uncertain system parameters inside the energy storage inverter.
The further improvement of the invention is that the specific implementation method of the step 6) is as follows: decomposing the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter obtained in the step 5) into an expansion form:
Figure BDA0002791150530000035
the disturbance term d (t) is related to the AC side current i0And (4) associating.
The invention further improves the device in step 7)The implementation method comprises the following steps: according to a load side current time domain expression: i.e. i0(t)＝I0sinωt、
Figure BDA0002791150530000036
Wherein: i is0A load side current amplitude; expanding the tapping expansion of the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter in the step 6) into a time domain expression formed by superposing cosine current signals and sine current signals:
Figure BDA0002791150530000041
wherein:
Figure BDA0002791150530000042
the further improvement of the invention is that the specific implementation method of the step 8) is as follows: considering the voltage distribution deviation as a dc quantity, there are:
Figure BDA0002791150530000043
constructing a voltage disturbance suppressor of the energy storage inverter according to the bus voltage fluctuation expression in the step 5):
Figure BDA0002791150530000044
wherein: p and
Figure BDA0002791150530000045
is an intermediate state variable matrix;
Figure BDA0002791150530000046
compensating the observed values for the double perturbations; k (x) ═ k1 k2 k3]TIs the voltage disturbance suppressor gain; q (x) is a suppression function, and the suppression gain is related to: q (x) k (x) e0。
The further improvement of the invention is that the specific implementation method of the step 9) is as follows: and (3) adding the output voltage of the voltage disturbance suppressor of the energy storage inverter device obtained in the step 8) into a voltage control loop as a reference signal, so that the voltage regulation performance of the energy storage inverter device is improved, and the voltage fluctuation of an alternating current side is suppressed.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the invention provides a disturbance suppressor added in a voltage control system of an energy storage inverter device, which can improve the voltage control capability of the energy storage inverter device
2. The disturbance suppressor provided by the invention can effectively suppress the problem of voltage regulation deviation caused by power fluctuation and inaccurate parameters.
Drawings
FIG. 1 is a circuit diagram of an energy storage inverter;
fig. 2 is a control block diagram of a voltage disturbance suppressor.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the power transmission equation of the energy storage inverter device can be expressed as:
Figure BDA0002791150530000051
in formula (1): rf、XfThe resistance value and the inductive reactance value of the filter circuit; u shapeacThe voltage of the alternating current side of the energy storage inverter is obtained; e.g. of the type0Is the net side voltage; delta is the power angle difference. Among the internal parameters of the energy storage inverter, R is usually satisfiedf＜＜XfThen equation (1) can be simplified as:
Figure BDA0002791150530000052
the alternating current dynamic equation of the energy storage inverter can be expressed as follows:
Figure BDA0002791150530000053
in formula (3): l isfIs the filter inductance value; cfIs a filter capacitance value; i.e. i0Is current at the network side；iacAnd outputting current to the alternating current side of the energy storage inverter.
As shown in FIG. 2, using
Figure BDA0002791150530000054
Representing a state vector, introducing a compensation disturbance term w (t), and constructing an energy storage inverter state equation as follows:
Figure BDA0002791150530000055
in formula (4):
Figure BDA0002791150530000056
in order to effectively inhibit the fluctuation of the bus voltage of the energy storage inverter, the invention divides the fluctuation of the bus voltage into: the influence of power fluctuation on voltage dynamic response and voltage distribution deviation caused by uncertain system parameters are as follows:
Figure BDA0002791150530000061
in formula (5): d (t) represents the influence of power fluctuation caused by load change on the network side and output adjustment of the distributed power supply point on the dynamic response of the voltage; Δ ψ (t) represents a voltage distribution deviation caused by uncertainty of internal system parameters of the energy storage inverter, and the expression is as follows:
Figure BDA0002791150530000062
the invention combines the disturbance term d (t) and the AC side current i0In addition, because the output voltage response of the energy storage inverter lags behind the current change, the conventional PI control cannot suppress the transient fluctuation of the bus voltage caused by the current change. In the actual control of the energy storage inverter, adverse factors such as uncertain system parameters exist, and the voltage response characteristics are reduced by the error terms, so that the invention compensates disturbanceThe term introduces a distribution deviation compensation Δ ψ (t).
The ac side current of the energy storage inverter device can be expressed as: i.e. i0(t)＝I0sin ω t, the derivative of which is:
Figure BDA0002791150530000063
wherein: i is0Load side current magnitude. The disturbance phase d (t) can be regarded as being formed by the superposition of cosine current signals and sine current signals, and the voltage disturbance compensation phase can be expanded into:
Figure BDA0002791150530000064
in formula (7):
Figure BDA0002791150530000065
in order to simplify the modeling structure of the voltage disturbance suppressor, the voltage distribution deviation Δ ψ (t) is regarded as a direct current quantity by the present invention, and there are:
Figure BDA0002791150530000066
based on the voltage disturbance suppressor model, the method comprises the following steps:
Figure BDA0002791150530000067
in formula (8): p and
Figure BDA0002791150530000071
is an intermediate state variable matrix;
Figure BDA0002791150530000072
compensating the observed values for the double perturbations; k (x) ═ k1k2 k3]TIs the voltage disturbance suppressor gain; q (x) is a suppression function, and the suppression gain is related to: q (x) k (x) e0。
Voltage disturbance suppressor gain k1、k2、k3The value selection needs to consider: voltage disturbance suppressionThe gain convergence speed of the controller and saturation effects affect that it is desirable to take as large a value as possible within a certain range. The output voltage of the voltage disturbance suppressor provided by the invention is used as a reference signal and added into a voltage control loop, so that the voltage stabilization and regulation performance of the energy storage inverter is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A method for inhibiting voltage fluctuation on an alternating current side of an energy storage inverter is characterized by comprising the following steps:
1) establishing a power transmission equation of the energy storage inverter;
2) simplifying the power transmission equation of the energy storage inverter in the step 1) according to the internal parameter properties of the energy storage inverter;
3) obtaining an alternating current dynamic equation of the energy storage inverter device according to the power transmission simplification equation of the energy storage inverter device obtained in the step 2);
4) constructing an energy storage inverter state equation according to the alternating current dynamic equation of the energy storage inverter in the step 3) and introducing a compensation disturbance term;
5) in order to effectively restrain the fluctuation of the bus voltage of the energy storage inverter, the fluctuation of the bus voltage is divided into: obtaining an alternating-current side bus voltage fluctuation expression of the energy storage inverter according to the state equation of the energy storage inverter in the step 4) under the influence of power fluctuation on voltage dynamic response and voltage distribution deviation caused by uncertain system parameters;
6) decomposing the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter obtained in the step 5) into an expansion form;
7) according to the load side current time domain expression, expanding the energy storage inverter AC side bus voltage fluctuation expression in the step 6) into a time domain expression overlapped by cosine current signals and sine current signals;
8) regarding the voltage distribution deviation as direct current quantity, and constructing a voltage disturbance suppressor of the energy storage inverter according to the bus voltage fluctuation expression in the step 5);
9) and (3) adding the output voltage of the voltage disturbance suppressor of the energy storage inverter device obtained in the step 8) into a voltage control loop as a reference signal, so that the voltage regulation performance of the energy storage inverter device is improved, and the voltage fluctuation of an alternating current side is suppressed.
2. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 1, wherein the specific implementation method of the step 1) is as follows: establishing a power transmission equation of the energy storage inverter:
Figure FDA0002791150520000011
wherein: rf、XfThe resistance value and the inductive reactance value of the filter circuit; u shapeacThe voltage of the alternating current side of the energy storage inverter is obtained; e.g. of the type0Is the net side voltage; delta is the power angle difference.
3. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 2, wherein the specific implementation method of the step 2) is as follows: according to the internal parameter properties of the energy storage inverter: rf＜＜XfSimplifying the power transmission equation of the energy storage inverter in the step 1):
Figure FDA0002791150520000021
4. the method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 3, wherein the specific implementation method of the step 3) is as follows: obtaining an alternating current dynamic equation of the energy storage inverter device according to the energy storage inverter device power transmission simplification equation obtained in the step 2):
Figure FDA0002791150520000022
wherein: l isfIs the filter inductance value; cfIs a filter capacitance value; i.e. i0Is the net side current; i.e. iacAnd outputting current to the alternating current side of the energy storage inverter.
5. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 4, wherein the specific implementation method of the step 4) is as follows: according to the alternating current dynamic equation of the energy storage inverter in the step 3), introducing a compensation disturbance term w (t) and constructing an energy storage inverter state equation:
Figure FDA0002791150520000023
wherein:
Figure FDA0002791150520000024
6. the method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 5, wherein the step 5) is realized by the following specific method: in order to effectively restrain the fluctuation of the bus voltage of the energy storage inverter, the fluctuation of the bus voltage is divided into: and (3) obtaining an alternating-current side bus voltage fluctuation expression of the energy storage inverter according to the state equation of the energy storage inverter in the step 4) under the influence of power fluctuation on voltage dynamic response and voltage distribution deviation caused by uncertain system parameters:
Figure FDA0002791150520000025
wherein: d (t) represents the influence of power fluctuation caused by load change on the network side and output adjustment of the distributed power supply point on the dynamic response of the voltage; and delta psi (t) represents the voltage distribution deviation caused by uncertain system parameters inside the energy storage inverter.
7. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 6, wherein the step 6) is realized by the following specific method: decomposing the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter obtained in the step 5) into an expansion form:
Figure FDA0002791150520000031
the disturbance term d (t) is related to the AC side current i0And (4) associating.
8. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 7, wherein the step 7) is realized by the following specific method: according to a load side current time domain expression: i.e. i0(t)＝I0sinωt、
Figure FDA0002791150520000032
Wherein: i is0A load side current amplitude; expanding the tapping expansion of the voltage fluctuation expression of the alternating-current side bus of the energy storage inverter in the step 6) into a time domain expression formed by superposing cosine current signals and sine current signals:
Figure FDA0002791150520000033
wherein:
Figure FDA0002791150520000035
9. the method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 8, wherein the step 8) is realized by the following specific method: considering the voltage distribution deviation as a dc quantity, there are:
Figure FDA0002791150520000036
constructing a voltage disturbance suppressor of the energy storage inverter according to the bus voltage fluctuation expression in the step 5):
Figure FDA0002791150520000037
wherein: p and
Figure FDA0002791150520000038
is an intermediate state variable matrix;
Figure FDA0002791150520000039
compensating the observed values for the double perturbations; k (x) ═ k1 k2 k3]TIs the voltage disturbance suppressor gain; q (x) is a suppression function, and the suppression gain is related to: q (x) k (x) e0。
10. The method for suppressing the voltage fluctuation on the alternating current side of the energy storage inverter device according to claim 9, wherein the step 9) is realized by the following specific method: and (3) adding the output voltage of the voltage disturbance suppressor of the energy storage inverter device obtained in the step 8) into a voltage control loop as a reference signal, so that the voltage regulation performance of the energy storage inverter device is improved, and the voltage fluctuation of an alternating current side is suppressed.
CN202011315253.XA 2020-11-20 2020-11-20 Method for inhibiting voltage fluctuation of alternating current side of energy storage inverter Pending CN112350330A (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102710165A (en) * 2012-03-19 2012-10-03 天津大学 Improved method for controlling direct current (DC) bus voltage of two-stage converter
CN110417055A (en) * 2019-07-31 2019-11-05 东北大学 A kind of direct Power Control method inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage
CN110460035A (en) * 2019-08-30 2019-11-15 北方工业大学 DC-DC converter dynamic compensation method and system based on robust disturbance observer

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102710165A (en) * 2012-03-19 2012-10-03 天津大学 Improved method for controlling direct current (DC) bus voltage of two-stage converter
CN110417055A (en) * 2019-07-31 2019-11-05 东北大学 A kind of direct Power Control method inhibiting the fluctuation of photovoltaic combining inverter DC side busbar voltage
CN110460035A (en) * 2019-08-30 2019-11-15 北方工业大学 DC-DC converter dynamic compensation method and system based on robust disturbance observer

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