CN110943468A - Control method, device and system of dual-mode energy storage converter - Google Patents

Control method, device and system of dual-mode energy storage converter Download PDF

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Publication number
CN110943468A
CN110943468A CN201811121413.XA CN201811121413A CN110943468A CN 110943468 A CN110943468 A CN 110943468A CN 201811121413 A CN201811121413 A CN 201811121413A CN 110943468 A CN110943468 A CN 110943468A
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mode
dual
energy storage
control mode
source control
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CN110943468B (en
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石荣亮
辛凯
刘云峰
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Huawei Technologies Co Ltd
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Huawei Technologies 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means

Abstract

The embodiment of the application provides a control method, a device and a system of a dual-mode energy storage converter. The control method comprises the following steps: acquiring an operation state value of an alternating current power grid; switching the control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value; wherein N is a positive integer; the voltage source control mode is a virtual synchronous generator voltage source control mode, and the current source control mode is a virtual synchronous generator current source control mode; or, the voltage source control mode is a droop control mode, and the current source control mode is a droop control mode. The control mode of the dual-mode energy storage converter is controlled to be adaptively switched between the voltage source control mode and the current source control mode with the frequency modulation and voltage regulation capacity, so that the operation stability of the dual-mode energy storage converter system is improved.

Description

Control method, device and system of dual-mode energy storage converter
Technical Field
The embodiment of the application relates to the technical field of energy storage converters, in particular to a control method, device and system of a dual-mode energy storage converter.
Background
With the rapid development of the energy internet, the large-scale energy storage technology has become a key supporting technology for the power generation and utilization of renewable energy sources. According to different functional requirements, the energy storage power station can work in a grid-connected mode and an off-grid mode and adapt to switching between the two modes. Under the condition of grid connection, the energy storage power station is matched with a wind power plant, a photovoltaic power station and other renewable energy power generation systems to realize the functions of stabilizing output fluctuation and peak clipping and valley filling. Under the off-grid condition, the energy storage power station serves as a main power supply to provide voltage and frequency support for the renewable energy power generation system.
Currently, a Virtual Synchronous Generator (VSG) control scheme may be adopted in the energy storage inversion system. The energy storage inverter system can comprise a master inverter and a slave inverter. The master control inverter provides voltage and frequency support for the system by adopting a voltage source output mode based on the virtual synchronous generator, and provides virtual inertia and virtual damping according to the capacity of the master control inverter. The slave control inverter receives the static active power and current quota issued by the master control inverter by adopting a current source output mode based on the virtual synchronous generator, and provides virtual inertia according to the capacity of the slave control inverter. The energy storage inverter system can output voltage electric energy with higher quality under the off-grid operation condition, and the structure of the controller is not required to be changed in the on-grid/off-grid switching process.
However, the energy storage inverter system with the structure has the advantages that the dependence of the system operation stability on the master control inverter is extremely strong, and the adaptability to the power grid strength change is poor.
Disclosure of Invention
The embodiment of the application provides a control method, a control device and a control system of a dual-mode energy storage converter, and the operation stability of the dual-mode energy storage converter system is improved.
In a first aspect, an embodiment of the present application provides a control method for a dual-mode energy storage converter, including: acquiring an operation state value of an alternating current power grid; switching a control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value; wherein N is a positive integer; the voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
According to the control method of the dual-mode energy storage converter, the control mode of the dual-mode energy storage converter can be controlled to be adaptively switched between the voltage source control mode and the current source control mode with the frequency modulation and voltage regulation functions according to the strength change of the power grid, and the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid are improved.
Optionally, in a possible implementation manner of the first aspect, N is equal to 1, and the switching of the control mode of at least one dual-mode energy storage converter of the N dual-mode energy storage converters between the voltage source control mode and the current source control mode according to the operation state value includes: if the running state value meets the preset condition of converting the voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode; and if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, N is greater than 1, and the switching of the control mode of at least one dual-mode energy storage converter of the N dual-mode energy storage converters between the voltage source control mode and the current source control mode according to the operation state value includes: and switching the control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
According to the control method of the dual-mode energy storage converter provided by the possible embodiment, the number of the dual-mode energy storage converters is multiple, and when the control mode needs to be switched according to the strength change of the power grid, one of the multiple dual-mode energy storage converters can be switched to the control mode. The control mode of the dual-mode energy storage converter can be adaptively switched between a voltage source control mode and a current source control mode with frequency modulation and voltage regulation functions, so that the adaptability of the dual-mode energy storage converter system to the power grid strength change and the operation stability are improved.
Optionally, in a possible implementation manner of the first aspect, the control mode of P dual-mode energy storage converters of the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters other than the P dual-mode energy storage converters is a current source control mode; p + Q is N, P is not less than 0, and Q is not less than 0; switching the control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operating state value, comprising: if the running state value meets the preset condition of converting the voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode; and if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, the control mode of the dual-mode energy storage converter is switched from the voltage source control mode to the current source control mode, and the method includes: outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode; the control mode of the dual-mode energy storage converter is switched from a current source control mode to a voltage source control mode, and the dual-mode energy storage converter comprises the following steps: and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, outputting the first driving signal to the dual-mode energy storage converter includes:
obtaining d-axis current reference component in voltage source control mode
Figure BDA0001811521380000021
q-axis current reference component
Figure BDA0001811521380000022
And d-axis current reference component in current source control mode
Figure BDA0001811521380000023
q-axis current reference component
Figure BDA0001811521380000024
From d-axis current reference component
Figure BDA0001811521380000025
q-axis current reference component
Figure BDA0001811521380000026
d-axis current reference component
Figure BDA0001811521380000027
And q-axis current reference component
Figure BDA0001811521380000028
Using numerical slow starter control equations
Figure BDA0001811521380000029
Obtaining d-axis current executive component
Figure BDA00018115213800000210
And q-axis current executive component
Figure BDA00018115213800000211
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800000212
Figure BDA00018115213800000213
t is slow starting time;
performing a component based on d-axis current
Figure BDA00018115213800000214
And q-axis current executive component
Figure BDA00018115213800000215
Outputting a first driving signal.
Optionally, in a possible implementation manner of the first aspect, outputting the second driving signal to the dual-mode energy storage converter includes:
obtaining d-axis current reference component in voltage source control mode
Figure BDA00018115213800000216
q-axis current reference component
Figure BDA00018115213800000217
And d-axis current reference component in current source control mode
Figure BDA00018115213800000218
q-axis current reference component
Figure BDA00018115213800000219
From d-axis current reference component
Figure BDA00018115213800000220
q-axis current reference component
Figure BDA00018115213800000221
d-axis current reference component
Figure BDA00018115213800000222
And q-axis current reference component
Figure BDA00018115213800000223
Using numerical slow starter control equations
Figure BDA00018115213800000224
Obtaining d-axis current executive component
Figure BDA00018115213800000225
And q-axis current executive component
Figure BDA00018115213800000226
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800000227
Figure BDA0001811521380000031
t is slow starting time;
performing a component based on d-axis current
Figure BDA0001811521380000032
And q-axis current executive component
Figure BDA0001811521380000033
And outputting a second driving signal.
Optionally, in a possible implementation manner of the first aspect, the reference component of the d-axis current in the voltage source control mode is obtained
Figure BDA0001811521380000034
q-axis current reference component
Figure BDA0001811521380000035
And d-axis current reference component in current source control mode
Figure BDA0001811521380000036
q-axis current reference component
Figure BDA0001811521380000037
The method comprises the following steps:
collecting power grid voltage, capacitor voltage and inductive current output by the dual-mode energy storage converter; acquiring d-axis current reference component in voltage source control mode according to power grid voltage, capacitor voltage and inductive current
Figure BDA0001811521380000038
q-axis current reference component
Figure BDA0001811521380000039
And d-axis current reference component in current source control mode
Figure BDA00018115213800000310
q-axis current reference component
Figure BDA00018115213800000311
Optionally, in a possible implementation manner of the first aspect, the operation state value is a grid impedance; presetting a voltage source to current source conversion condition, comprising: the running state value is smaller than a first threshold value;
presetting current source to voltage source conditions, comprising: the running state value is greater than a second threshold value; wherein the first threshold is less than the second threshold.
Optionally, in a possible implementation manner of the first aspect, the operation state value is a short-circuit ratio; presetting a voltage source to current source conversion condition, comprising: the running state value is greater than a third threshold value;
presetting current source to voltage source conditions, comprising: the running state value is smaller than a fourth threshold value; wherein the third threshold is greater than the fourth threshold.
In a second aspect, an embodiment of the present application provides a control device for a dual-mode energy storage converter, where the control device is applied to the dual-mode energy storage converter, and the control device for the dual-mode energy storage converter includes: the dual-mode energy storage converter control unit comprises a voltage source control unit and a current source control unit; the number of the dual-mode energy storage converters is N, the number of the dual-mode energy storage converter control units is N, the N dual-mode energy storage converters correspond to the N dual-mode energy storage converter control units one by one, and N is a positive integer; the voltage source control unit is used for controlling the control mode of the dual-mode energy storage converter corresponding to the voltage source control unit to be a voltage source control mode; the current source control unit is used for controlling the control mode of the dual-mode energy storage converter corresponding to the voltage source control unit to be a current source control mode; the coordination control unit is used for acquiring the running state value of the alternating current power grid; switching a control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value; the voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
Optionally, in a possible implementation manner of the first aspect, N is equal to 1, and the coordination control unit is specifically configured to: if the running state value meets the preset condition of converting the voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode; and if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, N is greater than 1, and the coordination control unit is specifically configured to: and switching the control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
Optionally, in a possible implementation manner of the first aspect, the control mode of P dual-mode energy storage converters of the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters other than the P dual-mode energy storage converters is a current source control mode; p + Q is N, P is not less than 0, and Q is not less than 0; the coordination control unit is specifically configured to: if the running state value meets the preset condition of converting the voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode; and if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, the current source control unit is specifically configured to: outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode; the voltage source control unit is specifically configured to: and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
Optionally, in a possible implementation manner of the first aspect, the current source control unit is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA0001811521380000041
q-axis current reference component
Figure BDA0001811521380000042
And d-axis current reference component in voltage source control mode
Figure BDA0001811521380000043
q-axis current reference component
Figure BDA0001811521380000044
From d-axis current reference component
Figure BDA0001811521380000045
q-axis current reference component
Figure BDA0001811521380000046
d-axis current reference component
Figure BDA0001811521380000047
And q-axis current reference component
Figure BDA0001811521380000048
Using numerical slow starter control equations
Figure BDA0001811521380000049
Obtaining d-axis current executive component
Figure BDA00018115213800000410
And q-axis current executive component
Figure BDA00018115213800000411
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800000412
Figure BDA00018115213800000413
t is slow starting time;
performing a component based on d-axis current
Figure BDA00018115213800000414
And q-axis current executive component
Figure BDA00018115213800000415
Outputting a first driving signal.
Optionally, in a possible implementation manner of the first aspect, the voltage source control unit is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA00018115213800000416
q-axis current reference component
Figure BDA00018115213800000417
And d-axis current reference component in voltage source control mode
Figure BDA00018115213800000418
q-axis current reference component
Figure BDA00018115213800000419
From d-axis current reference component
Figure BDA00018115213800000420
q-axis current reference component
Figure BDA00018115213800000421
d-axis current reference component
Figure BDA00018115213800000422
And q-axis current reference component
Figure BDA00018115213800000423
Using numerical slow starter control equations
Figure BDA00018115213800000424
Obtaining d-axis current executive component
Figure BDA00018115213800000425
And q-axis current executive component
Figure BDA00018115213800000426
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800000427
Figure BDA00018115213800000428
t is slow starting time;
performing a component based on d-axis current
Figure BDA00018115213800000429
And q-axis current executive component
Figure BDA00018115213800000430
And outputting a second driving signal.
Optionally, in a possible implementation manner of the first aspect, the dual-mode energy storage converter control unit further includes a voltage and current sampling unit; voltage currentThe sampling unit is used for collecting the power grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter; the voltage source control unit or the current source control unit is specifically used for acquiring a d-axis current reference component in a voltage source control mode according to the power grid voltage, the capacitor voltage and the inductive current
Figure BDA00018115213800000431
q-axis current reference component
Figure BDA00018115213800000432
And d-axis current reference component in voltage source control mode
Figure BDA00018115213800000433
q-axis current reference component
Figure BDA00018115213800000434
Optionally, in a possible implementation manner of the first aspect, the operation state value is a grid impedance; presetting a voltage source to current source conversion condition, comprising: the running state value is smaller than a first threshold value; presetting current source to voltage source conditions, comprising: the running state value is greater than a second threshold value; wherein the first threshold is less than the second threshold.
Optionally, in a possible implementation manner of the first aspect, the operation state value is a short-circuit ratio; presetting a voltage source to current source conversion condition, comprising: the running state value is greater than a third threshold value; presetting current source to voltage source conditions, comprising: the running state value is smaller than a fourth threshold value; wherein the third threshold is greater than the fourth threshold.
In a third aspect, an embodiment of the present application provides a dual-mode energy storage converter system, including: the dual-mode energy storage converter and the control device of the dual-mode energy storage converter provided by any one of the embodiments of the second aspect are provided.
In a fourth aspect, an embodiment of the present application provides a storage medium, including: a readable storage medium and a computer program for implementing the control method of the dual-mode energy storage converter provided in any of the embodiments of the first aspect.
In a fifth aspect, the present application provides a program product including a computer program (i.e., executing instructions), the computer program being stored in a readable storage medium. The processor may read the computer program from the readable storage medium, and the processor executes the computer program to make the apparatus implement the control method of the dual-mode energy storage converter provided in any one of the embodiments of the first aspect.
The embodiment of the application provides a control method, a control device and a control system of a dual-mode energy storage converter. The control mode of the dual-mode energy storage converter can be controlled to be adaptively switched between the voltage source control mode and the current source control mode with the frequency modulation and voltage regulation capacity according to the strength change of the power grid, so that the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid are improved.
Drawings
Fig. 1 is an architecture diagram of an energy storage power station according to an embodiment of the present application;
fig. 2A to fig. 2C are schematic diagrams of application scenarios of the energy storage power station shown in fig. 1;
fig. 3A is a schematic structural diagram illustrating the dual-mode energy storage converter operating in a virtual synchronous generator voltage source control mode according to the embodiment of the present application;
fig. 3B is a schematic structural diagram illustrating the dual-mode energy storage converter operating in a virtual synchronous generator current source control mode according to the embodiment of the present application;
fig. 4A is a schematic structural diagram illustrating the dual-mode energy storage converter operating in a droop control mode according to the embodiment of the present application;
fig. 4B is a schematic structural diagram illustrating the operation of the dual-mode energy storage converter in the droop control mode according to the embodiment of the present application;
fig. 5 is a flowchart of a control method of the dual-mode energy storage converter according to an embodiment of the present application;
fig. 6 is a flowchart of a control method of the dual-mode energy storage converter according to the second embodiment of the present application;
fig. 7 is a flowchart of a control method of the dual-mode energy storage converter according to the third embodiment of the present application;
fig. 8 is a schematic structural diagram of a dual-mode energy storage converter system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a dual-mode energy storage converter system according to a second embodiment of the present application.
Detailed Description
Fig. 1 is an architecture diagram of an energy storage power station according to an embodiment of the present application. As shown in fig. 1, the energy storage power plant may include: a dc power system 100, a dual-mode energy-storage converter system 200, and an ac power system 300. The dc power system 100 is connected to the dual-mode energy storage converter system 200, and the dual-mode energy storage converter system 200 is connected to the ac power system 300. Dc power system 100 has energy storage capability. The energy storage power station can be applied to a grid-connected mode and an off-grid mode. Fig. 2A to 2C are schematic diagrams of application scenarios of the energy storage power station shown in fig. 1. Fig. 2A shows a new energy photovoltaic power generation system that is reserved for standby. As shown in fig. 2A, the photovoltaic system 101 with reserve functions realizes energy storage of the dc system by means of reserve functions. When the frequency of the power grid is reduced, the reserved standby direct current electric energy passes through the dual-mode energy storage converter system 201, and the direct current electric energy is converted into alternating current electric energy, so that the electric energy is transmitted to the alternating current power grid 301, and meanwhile, the electric energy actively participates in the frequency modulation of the alternating current power grid 301. Fig. 2B illustrates a typical configured energy storage new energy photovoltaic power generation system. As shown in fig. 2B, the photovoltaic system 102 realizes energy storage of the dc system by configuring the energy storage system 103. When the grid frequency fluctuates, the dc power stored in the energy storage system 103 passes through the dual-mode energy storage converter system 202, so that the energy exchange between the dc power system and the ac power system is realized, and actively participates in the frequency modulation of the ac power grid 302. Fig. 2C shows a typical energy storage and generation system. As shown in fig. 2C, when the grid frequency fluctuates, the dc power stored in the energy storage system 104 passes through the dual-mode energy storage converter system 203, so as to realize energy exchange between the dc power system and the ac power system, and actively participate in the frequency modulation of the ac power grid 303.
In embodiments of the present application, a dual mode energy storage converter system may include a dual mode energy storage converter and a control device for the dual mode energy storage converter. The control device of the dual-mode energy storage converter is used for controlling and switching the control mode of the dual-mode energy storage converter. The number of the dual-mode energy storage converters is not limited in the application, and the number of the dual-mode energy storage converters can be one or more.
The following describes, by way of example, a dual-mode energy storage converter system and a control mode of a dual-mode energy storage converter according to an embodiment of the present application. Alternatively, the control modes of the dual mode energy storage converter may include a voltage source control mode and a current source control mode. The voltage source control mode may include a virtual synchronous generator voltage source control mode and a droop control mode. The current source control mode may include a virtual synchronous generator current source control mode and a droop control mode.
Alternatively, in an example, fig. 3A is a schematic structural diagram of a dual-mode energy storage converter provided in an embodiment of the present application, which is operated in a virtual synchronous generator voltage source control mode.
As shown in fig. 3A, the dual mode energy storage converter system may include a dual mode energy storage converter 11 and a control device for the dual mode energy storage converter. The control device of the dual-mode energy storage converter may include a voltage source control unit 12. The voltage source control unit 12 may include: the phase-locked loop control system comprises a phase-locked loop 121, a coordinate transformation unit 122, a power calculation unit 123, an active-frequency control unit 124, a reactive-voltage control unit 125, a voltage outer loop PI controller 126, a current inner loop PI controller 127, a coordinate transformation unit 128, an SVPWM modulation unit 129 and a synchronous control unit 130. Input end of dual-mode energy storage converter 11 and DC side filter capacitor CdcAnd (4) connecting. The output of the dual-mode tank converter 11 is connected to the input of the LC filter 13. The output of LC filter 13 is connected to ac power supply system 14 via a point of common coupling PCC. The LC filter 13 includes an inductor L and a capacitor C.
As shown in fig. 3A, the control scheme for operating the dual mode energy storage converter 11 in a virtual synchronous generator voltage source control mode (VVSG) may include the following steps:
the method comprises the following steps: the voltage and current sampling unit 15 collects the grid voltage (e) of the grid-connected point of the dual-mode energy storage converter 11ga、egb、egc) Capacitor voltage (u)ca、ucb、ucc) And the inductor current (i)La、iLb、iLc). The phase θ of the network voltage can be obtained using a phase locked loop 121gAngular frequency omegag(not shown) and the voltage amplitude Eg. The capacitance voltage and the inductance current are transformed by abc/dq coordinates of the coordinate transformation unit 122 to obtain d-axis components and q-axis components (u) of the capacitance voltage and the inductance current respectivelycd、ucq、iLd、iLq)。
Step two: d, q axis component u of capacitance voltagecd、ucqAnd d, q axis components i of the inductor currentLd、iLqAs an input signal of the power calculating unit 123, an average active power P and an average reactive power Q of the VVSG are calculated. The calculation equations of the average active power and the average reactive power are respectively as follows:
Figure BDA0001811521380000061
in the formula: τ is the filter time constant of the first order low pass filter and s is the laplacian.
Step three: the average active power P is used as an input signal of the VVSG active-frequency control unit 124 to command ω at an angular frequency0And an active instruction PrefAs a command of the VVSG active-frequency control unit 124, an output angular frequency ω of the VVSG is calculated, and the output angular frequency ω is integrated to obtain an output phase angle θ of the VVSG.
The VVSG active-frequency control unit 124 includes an active-frequency droop control equation model:
Figure BDA0001811521380000062
in the formula: m is the active-frequency droop coefficient, PmIs VVVGGMechanical power.
1) The VVSG active-frequency control unit 124 includes a rotor equation of motion model:
Figure BDA0001811521380000063
in the formula: j is the virtual inertia and D is the virtual damping.
2) The output angular frequency ω of the VVSG can be obtained from the equations (2) and (3):
Figure BDA0001811521380000071
step four: the average reactive power Q is used as an input signal of the VVGG reactive-voltage control unit 125, and the amplitude value of the voltage is used as an instruction ErefAnd a reactive instruction QrefAs an instruction of the VVSG reactive-voltage control unit 125, the output voltage amplitude E of the VVSG is calculated. The reactive-voltage control equation is:
E＝Eref+n(Qref-Q) (5)
in the formula: and n is a reactive-voltage droop coefficient.
The synchronization control unit 130 is based on the grid voltage (e)ga、egb、egc) Phase theta of the grid voltagegAnd the voltage amplitude EgThe output phase angle theta and the voltage amplitude E of the dual-mode energy storage converter 11, and the phase and voltage amplitude synchronous signal omega of the dual-mode energy storage converter 11res、Eres。
For the description of the synchronization control unit 130, refer to the first step in the adaptive mode switching scheme between the VVSG control mode and the CVSG control mode in the implementation shown in fig. 5.
It should be noted that, when the control mode of the dual-mode energy storage converter 11 is the VVSG control mode, the phase and voltage amplitude synchronization signal ω isres、EresMay be 0.
Step five: using the magnitude E of the VVSG output voltage as the d-component command of the capacitor voltage, i.e.
Figure BDA0001811521380000072
Setting the q-component of the capacitor voltage to 0, i.e.
Figure BDA0001811521380000073
Combining the d and q axis components u of the actual capacitor voltagecd、ucqCalculating d and q axis reference commands of current by voltage outer loop PI controller 126
Figure BDA0001811521380000074
(also referred to as d, q-axis current reference components).
Step six: d-and q-axis reference commands of the obtained current
Figure BDA0001811521380000075
Input to a current inner loop PI controller 127, and combines the actual inductive current d and q axis components iLd、iLqTo obtain a control signal Ud、UqThen, the modulated wave is obtained by dq/αβ coordinate conversion by the coordinate conversion unit 128
Figure BDA0001811521380000076
Step seven: the obtained modulated wave
Figure BDA0001811521380000077
The signal is input to a Space Vector Pulse Width Modulation (SVPWM) Modulation unit 129, and the SVPWM Modulation unit 129 receives the modulated wave
Figure BDA0001811521380000078
And outputting a driving signal to the dual-mode energy storage converter 11 to realize the control of the power device of the dual-mode energy storage converter 11.
Thus, the control mode of the dual mode energy storage converter 11 is the virtual synchronous generator voltage source control mode.
Alternatively, in another example, fig. 3B is a schematic structural diagram of the dual-mode energy storage converter provided in the embodiment of the present application, which operates in a virtual synchronous generator current source control mode.
As shown in fig. 3B, the dual mode energy storage converter system may include the dual mode energy storage converter 11 and a control device for the dual mode energy storage converter. The control device of the dual-mode energy storage converter may include a current source control unit 22. The current source control unit 22 may include: a phase-locked loop 121, a coordinate transformation unit 122, a CVSG control unit 131, a current inner loop PI controller 127, a coordinate transformation unit 128, and an SVPWM modulation unit 129. Input end of dual-mode energy storage converter 11 and DC side filter capacitor CdcAnd (4) connecting. The output of the dual-mode tank converter 11 is connected to the input of the LC filter 13. The output of LC filter 13 is connected to ac power supply system 14 via a point of common coupling PCC. The LC filter 13 includes an inductor L and a capacitor C.
As shown in fig. 3B, the control scheme for operating the dual-mode energy storage converter 11 in the virtual synchronous generator current source control mode (CVSG) may include the following steps:
the method comprises the following steps: the voltage and current sampling unit 15 collects the grid voltage (e) of the grid-connected point of the dual-mode energy storage converter 11ga、egb、egc) Capacitor voltage (u)ca、ucb、ucc) And the inductor current (i)La、iLb、iLc). The phase θ of the network voltage can be obtained using a phase locked loop 121gAngular frequency omegagAnd the voltage amplitude Eg. The capacitance voltage and the inductance current are transformed by abc/dq coordinates of the coordinate transformation unit 122 to obtain d-axis components and q-axis components (u) of the capacitance voltage and the inductance current respectivelycd、ucq、iLd、iLq)。
Step two: converting the angular frequency omega of the gridgAnd the voltage amplitude EgAs an input signal of the CVSG control unit 131, a magnitude of voltage command ErefAngular frequency command omega0And active and reactive commands Pref、QrefAs a command of the CVSG control unit 131, d-and q-axis reference commands of the calculated current
Figure BDA0001811521380000081
(also referred to as d, q-axis current reference components).
1) The CVSG control unit 131 includes a rotor equation of motion model:
Figure BDA0001811521380000082
in the formula: j is a virtual inertia; m is an active-frequency droop coefficient; pcIs the active power of the CVSG.
2) The CVSG control unit 131 includes a first order voltage regulation equation model:
Qc＝Qref+(Eref-Eg)/n (7)
in the formula: n is a reactive-voltage droop coefficient; qcIs the reactive power of CVSG.
3) The CVSG control unit 131 includes a current command calculation model:
Figure BDA0001811521380000083
step three: d-and q-axis reference commands of the obtained current
Figure BDA0001811521380000084
Input to a current inner loop PI controller 127, and combines the actual inductive current d and q axis components iLd、iLqTo obtain a control signal Ud、UqThen, the modulated wave is obtained by dq/αβ coordinate conversion by the coordinate conversion unit 128
Figure BDA0001811521380000085
Step four: the obtained modulated wave
Figure BDA0001811521380000086
The modulated wave is input to SVPWM modulating section 129, and SVPWM modulating section 129 receives the modulated wave
Figure BDA0001811521380000087
Outputs a driving signal to the dual-mode energy storage converter 11,and the control of the power device of the dual-mode energy storage converter 11 is realized.
Thus, the control mode of the dual-mode energy storage converter 11 is the virtual synchronous generator current source control mode.
Alternatively, in another example, fig. 4A is a schematic structural diagram of the dual-mode energy storage converter provided by the embodiment of the present application, which operates in the droop control mode.
As shown in fig. 4A, the dual mode energy storage converter system may include a dual mode energy storage converter 21 and a control device for the dual mode energy storage converter. The control device of the dual-mode energy storage converter may include a voltage source control unit 32. The voltage source control unit 32 may include: the phase-locked loop 221, the coordinate transformation unit 222, the power calculation unit 223, the active-frequency droop control unit 224, the reactive-voltage droop control unit 225, the voltage outer loop PI controller 226, the current inner loop PI controller 227, the coordinate transformation unit 228, the SVPWM modulation unit 229, and the synchronization control unit 230. Input end and DC side filter capacitor C of dual-mode energy storage converter 21dcAnd (4) connecting. The output of the dual mode tank converter 21 is connected to the input of the LC filter 23. The output of LC filter 23 is connected to ac power grid 24 via a point of common coupling PCC. The LC filter 23 includes an inductor L and a capacitor C.
As shown in fig. 4A, the control scheme for the dual-mode energy storage converter 21 operating in Droop control mode (Droop) may include the steps of:
the method comprises the following steps: the voltage and current sampling unit 25 collects the grid voltage (e) of the grid-connected point of the dual-mode energy storage converter 21ga、egb、egc) Capacitor voltage (u)ca、ucb、ucc) And the inductor current (i)La、iLb、iLc). The phase θ of the grid voltage can be obtained using the phase locked loop 221gAngular frequency omegag(not shown) and the voltage amplitude Eg. The capacitance voltage and the inductance current are transformed by abc/dq coordinates of the coordinate transformation unit 222 to obtain d-axis components and q-axis components (u) of the capacitance voltage and the inductance current respectivelycd、ucq、iLd、iLq)。
Step two: d, q axis component u of capacitance voltagecd、ucqAnd d, q axis components i of the inductor currentLd、iLqAs input signals to the power calculation unit 223, the average active power P and the average reactive power Q of the dual-mode energy storage converter 21 are calculated. The calculation equations of the average active power and the average reactive power are respectively as follows:
Figure BDA0001811521380000091
in the formula: τ is the filter time constant of the first order low pass filter and s is the laplacian.
Step three: the average active power P is used as the input signal of the active-frequency droop control unit 224 to command ω with angular frequency0And an active instruction PrefAs a command of the active-frequency droop control unit 224, an output angular frequency ω of the dual-mode energy storage converter 21 is calculated, and the output angular frequency ω is integrated to obtain an output phase angle θ of the dual-mode energy storage converter 21.
The active-frequency droop control equation is:
ω＝ω0+m(Pref-P) (2)
in the formula: and m is an active-frequency droop coefficient.
Step four: the average reactive power Q is used as an input signal of a reactive-voltage droop control unit 225, and the amplitude value of the voltage is used as an instruction ErefAnd a reactive instruction QrefThe output voltage magnitude E of the dual-mode tank converter 21 is calculated as a command of the reactive-voltage droop control unit 225.
The reactive-voltage control equation is:
E＝Eref+n(Qref-Q) (3)
in the formula: and n is a reactive-voltage droop coefficient.
The synchronization control unit 230 is based on the grid voltage (e)ga、egb、egc) Phase theta of the grid voltagegAnd the voltage amplitude EgThe output phase angle theta and the voltage amplitude E of the dual-mode energy storage converter 21 and the output dual-mode energy storagePhase and voltage amplitude synchronous signal omega of converter 21res、Eres。
For the description of the synchronous control unit 230, refer to the first step in the adaptive mode switching scheme between the Droop control mode and the CDroop control mode in the implementation shown in fig. 5.
It should be noted that, when the control mode of the dual-mode energy storage converter 21 is the Droop control mode, the phase and voltage amplitude synchronous signal ω isres、EresMay be 0.
Step five: the output voltage amplitude E of the dual-mode energy storage converter 21 is used as a d-axis component instruction of the capacitor voltage, namely
Figure BDA0001811521380000092
Setting the q-component of the capacitor voltage to 0, i.e.
Figure BDA0001811521380000093
Combining the d and q axis components u of the actual capacitor voltagecd、ucqThe d and q-axis reference commands of the current are calculated by the voltage outer loop PI controller 226
Figure BDA0001811521380000094
(also referred to as d, q-axis current reference components).
Step six: d-and q-axis reference commands of the obtained current
Figure BDA0001811521380000095
Input to a current inner loop PI controller 227, and combines the actual inductive current d and q axis components iLd、iLqTo obtain a control signal Ud、UqThen, the modulated wave is obtained by dq/αβ coordinate transformation of the coordinate transformation unit 228
Figure BDA0001811521380000096
Step seven: the obtained modulated wave
Figure BDA0001811521380000097
Input to SVPWMModulation section 229, SVPWM modulation section 229 based on received modulated wave
Figure BDA0001811521380000098
And outputting a driving signal to the dual-mode energy storage converter 21 to realize the control of the power device of the dual-mode energy storage converter 21.
Thus, the control mode of the dual mode energy storage converter 21 is the droop control mode.
Alternatively, in another example, fig. 4B is a schematic structural diagram of the dual-mode energy storage converter provided by the embodiment of the present application, which operates in the droop control mode.
As shown in fig. 4B, the dual mode energy storage converter system may include the dual mode energy storage converter 21 and a control device for the dual mode energy storage converter. The control device of the dual-mode energy storage converter may include a current source control unit 42. The current source control unit 42 may include: a phase-locked loop 221, a coordinate transformation unit 222, a CDroop control unit 231, a current inner loop PI controller 227, a coordinate transformation unit 228, and an SVPWM modulation unit 229. Input end and DC side filter capacitor C of dual-mode energy storage converter 21dcAnd (4) connecting. The output of the dual mode tank converter 21 is connected to the input of the LC filter 23. The output of LC filter 23 is connected to ac power grid 24 via a point of common coupling PCC. The LC filter 23 includes an inductor L and a capacitor C.
As shown in fig. 4B, the control scheme for the dual-mode energy storage converter 21 to operate in the droop control mode (CDroop) may include the following steps:
the method comprises the following steps: the voltage and current sampling unit 25 collects the grid voltage (e) of the grid-connected point of the dual-mode energy storage converter 21ga、egb、egc) Capacitor voltage (u)ca、ucb、ucc) And the inductor current (i)La、iLb、iLc). The phase θ of the grid voltage can be obtained using the phase locked loop 221gAngular frequency omegagAnd the voltage amplitude Eg. The capacitance voltage and the inductance current are transformed by abc/dq coordinates of the coordinate transformation unit 222 to obtain d-axis components and q-axis components (u) of the capacitance voltage and the inductance current respectivelycd、ucq、iLd、iLq)。
Step two: converting the angular frequency omega of the gridgAnd the voltage amplitude EgAs an input signal of the CDroop control unit 231, a voltage amplitude instruction ErefAngular frequency command omega0And active and reactive commands Pref、QrefD-and q-axis reference instructions for calculating current as instructions for the CDroop control unit 231
Figure BDA0001811521380000101
(also referred to as d, q-axis current reference components).
1) The CDroop control unit 231 includes a frequency-active droop control equation model:
Pc＝Pref+(ω0-ω)/m (4)
in the formula: m is an active-frequency droop coefficient; pcThe active power is output by the energy storage converter.
2) The CDroop control unit 231 includes a voltage-reactive droop control equation model:
Qc＝Qref+(Eref-Eg)/n (5)
in the formula: n is a reactive-voltage droop coefficient; qcThe output reactive power of the energy storage converter is obtained.
3) The CDroop control unit 231 includes a current instruction calculation model:
Figure BDA0001811521380000102
step three: d-and q-axis reference commands of the obtained current
Figure BDA0001811521380000103
Input to a current inner loop PI controller 227, and combines the actual inductive current d and q axis components iLd、iLqTo obtain a control signal Ud、UqThen, the modulated wave is obtained by dq/αβ coordinate conversion by coordinate conversion section 228
Figure BDA0001811521380000104
Step four: the obtained modulated wave
Figure BDA0001811521380000105
The modulated wave is inputted to an SVPWM modulation unit 229, and the SVPWM modulation unit 229 receives the modulated wave
Figure BDA0001811521380000106
And outputting a driving signal to the dual-mode energy storage converter 21 to realize the control of the power device of the dual-mode energy storage converter 21.
Thus, the control mode of the dual-mode energy storage converter 21 is the droop control mode.
According to the control method of the dual-mode energy storage converter, the dual-mode energy storage converter is controlled to be adaptively switched between the voltage source control mode and the current source control mode with the frequency modulation and voltage regulation capacity according to the running state of the power grid, and therefore adaptability to power grid strength changes and running stability of a system are improved.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 5 is a flowchart of a control method of the dual-mode energy storage converter according to an embodiment of the present application. In the control method of the dual-mode energy storage converter provided by the embodiment, the execution main body can be a control device of the dual-mode energy storage converter, and the control method can be applied to a dual-mode energy storage converter system. As shown in fig. 5, the method for controlling a dual-mode energy storage converter provided in this embodiment may include:
s501, obtaining the running state value of the alternating current power grid.
The operation state value of the alternating current power grid can reflect the scale and the operation state of the power system. The present embodiment does not limit the operation state value of the ac power grid.
Alternatively, the operating state value of the ac grid may be the grid impedance or the short circuit ratio.
Grid impedance refers to the impedance of the power supply system looking into the point of common connection. The larger the grid impedance, the weaker the grid impedance is, the more the. For example, as shown in fig. 3A, the grid impedance refers to the impedance Zg of the ac grid 14 looking into the PCC.
The short circuit ratio is the system short circuit capacity divided by the device capacity. Therefore, when the short circuit is large, the short circuit is connected to a stronger power system.
It should be noted that, in this embodiment, an implementation manner of obtaining the operating state value of the ac power grid is not limited, and an existing method may be referred to. For example, as shown in FIG. 3A, the coordinating control unit 16 may monitor the grid voltage (e)ga、egb、egc) With the mains current (i)ga、igb、igc) Obtaining a grid impedance Z of the AC grid 14g。
And S502, switching the control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
Wherein N is a positive integer.
The voltage source control mode is a virtual synchronous generator voltage source control mode, and the current source control mode is a virtual synchronous generator current source control mode. Or, the voltage source control mode is a droop control mode, and the current source control mode is a droop control mode.
Specifically, the term "dual mode" refers to that the dual-mode energy storage converter can work in two control modes, namely a voltage source control mode and a current source control mode. The control mode of the dual-mode energy storage converter can be changed, and the dual-mode energy storage converter can be switched between a voltage source control mode and a current source control mode according to the operation state value of the alternating current power grid. Wherein, in one implementation, the control mode of the dual-mode energy storage converter is switched between a virtual synchronous generator voltage source control mode and a virtual synchronous generator current source control mode. In yet another implementation, the control mode of the dual-mode energy storage converter is switched between a droop control mode and an inverted droop control mode. The virtual synchronous generator voltage source control mode, the virtual synchronous generator current source control mode, the droop control mode and the droop control mode can realize the frequency modulation and voltage regulation functions, and refer to the descriptions of fig. 3A to 3B and fig. 4A to 4B. Along with the state change of the alternating current power grid, the dual-mode energy storage converter working in the control mode can adjust the frequency and the voltage of the alternating current power grid, and the operation stability of the power grid is improved.
It should be noted that, in the present embodiment, the number of the dual-mode energy storage converters is not limited. The number of the dual-mode energy storage converters is represented by N, and N is a positive integer. That is, the number of the dual-mode energy storage converters may be 1 or more.
In the embodiment, the number of the dual-mode energy storage converters which need to switch the control mode among the N dual-mode energy storage converters is not limited, and may be 1 or more.
Therefore, the control method of the dual-mode energy storage converter provided by the embodiment can control the control mode of at least one dual-mode energy storage converter to adaptively switch between the voltage source control mode and the current source control mode with the frequency modulation and voltage regulation functions according to the strength change of the power grid, and improves the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid.
Next, how the dual-mode energy storage converter switches between the voltage source control mode and the current source control mode in S502 is described with reference to different application scenarios.
Optionally, in an application scenario, the number of the dual-mode energy storage converters may be 1, and N is equal to 1. S502, switching a control mode of at least one dual-mode energy storage converter of the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value, which may include:
and if the running state value meets the condition of converting the preset voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode.
And if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
In this implementation, since the number of the dual-mode energy storage converters is 1, the control mode of the dual-mode energy storage converter may be switched according to whether the corresponding switching condition is satisfied. For example, the current control mode of the dual-mode energy storage converter is a voltage source control mode. The method comprises the steps of obtaining an operation state value of an alternating current power grid in real time, and determining whether the operation state value meets a preset voltage source-to-current source condition. And if so, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode. And then, continuously acquiring the running state value of the alternating current power grid in real time, and determining whether the running state value meets the condition of a preset current source-to-voltage source. And if not, continuously acquiring the running state value of the alternating current power grid in real time. And when the running state value meets the condition of converting the current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode. Therefore, the control mode of the dual-mode energy storage converter can be controlled according to the running state value, and the adaptability and the running stability of the dual-mode energy storage converter system to the power grid strength change are improved.
Optionally, in another application scenario, the number of the dual-mode energy storage converters is multiple, and N is an integer greater than 1. S502, switching a control mode of at least one dual-mode energy storage converter of the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value, which may include:
and switching the control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
In this implementation, since the number of the dual-mode energy storage converters is plural, when the control mode needs to be switched, one of the plural dual-mode energy storage converters may be switched to the control mode. The present embodiment is not limited to which one of the N dual-mode energy storage converters is the one of the N dual-mode energy storage converters. For example, one of the dual-mode energy storage converters may be the dual-mode energy storage converter which has performed the control mode switching last time, or may be one of the at least one dual-mode energy storage converter which has not performed the control mode switching last within a preset time period.
Optionally, the control mode of P dual-mode energy storage converters of the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters other than the P dual-mode energy storage converters is a current source control mode. P + Q is N, P is not less than 0, and Q is not less than 0. S502, switching a control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value, which may include:
and if the running state value meets the condition of converting the preset voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode.
And if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
This is illustrated by way of example.
Assume 5 dual mode energy storage converters, respectively labeled A, B, C, D, E. Wherein the current control mode of A, B, C is a voltage source control mode and the current control mode of D, E is a current source control mode. And acquiring the running state value of the alternating current power grid in real time. If the operating condition value satisfies the preset voltage-to-current source condition, the control mode of a in A, B, C is switched from the voltage source control mode to the current source control mode. At this time, the current control mode of B, C is the voltage source control mode, and the current control mode of A, D, E is the current source control mode. And continuously acquiring the running state value of the alternating current power grid in real time. And if the running state value does not meet the condition of converting the preset voltage source into the current source and the running state value does not meet the condition of converting the preset current source into the voltage source, continuously acquiring the running state value of the alternating current power grid in real time. If the operating condition value satisfies the preset current-to-voltage source condition, the control mode of E at A, D, E is switched from the current source control mode to the voltage source control mode. At this time, the current control mode of B, C, E is the voltage source control mode, and the current control mode of A, D is the current source control mode. The control mode switching of the dual-mode energy storage converters can be controlled according to the running state value through repeated adjustment, and the adaptability and the running stability of the dual-mode energy storage converter system to the power grid strength change are improved.
Next, the preset voltage-to-current source condition and the preset current-to-voltage source condition will be described. The corresponding switching conditions may be different according to the different operating state values of the ac power grid.
Optionally, in an implementation, the operation state value is a grid impedance.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is less than a first threshold.
Presetting current source to voltage source conditions, comprising: the operating condition value is greater than a second threshold value.
Wherein the first threshold is less than the second threshold.
In this implementation, the first threshold may be labeled as ZminThe second threshold may be labeled as Zmax. When the running state value is less than ZminWhen the control mode of the dual-mode energy storage converter is switched from the voltage source control mode to the current source control mode. When the running state value is larger than ZmaxWhen the control mode of the dual-mode energy storage converter is switched from the current source control mode to the voltage source control mode, the control mode of the dual-mode energy storage converter can be switched.
It should be noted that, in this embodiment, specific values of the first threshold and the second threshold are not limited.
Optionally, in yet another implementation, the operating condition value is a short circuit ratio.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is greater than a third threshold value.
Presetting current source to voltage source conditions, comprising: the operating condition value is less than a fourth threshold value.
Wherein the third threshold is greater than the fourth threshold.
In this implementation, the third threshold may be labeled as an SCRmaxThe fourth threshold may be labeled as SCRmin. When the running state value is larger than the SCRmaxWhen the control mode of the dual-mode energy storage converter is switched from the voltage source control mode to the current source control mode. When the running state value is less than SCRminWhen the control mode of the dual-mode energy storage converter is switched from the current source control mode to the voltage source control mode, the control mode of the dual-mode energy storage converter can be switched.
It should be noted that, in this embodiment, specific values of the third threshold and the fourth threshold are not limited.
Optionally, in the control method of the dual-mode energy storage converter provided in this embodiment, the control mode of the dual-mode energy storage converter is switched from the voltage source control mode to the current source control mode, and the method may include:
and outputting a first driving signal to the dual-mode energy storage converter. The first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode.
The control mode of the dual-mode energy storage converter is switched from the current source control mode to the voltage source control mode, and the method can comprise the following steps:
and outputting a second driving signal to the dual-mode energy storage converter. And the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
Specifically, the dual-mode energy storage converter can work in different control modes according to different driving signals. For example, in one example, referring to fig. 3A, in the VVSG control scheme, as described in step seven, the SVPWM modulating unit 129 modulates the wave according to the received modulation wave
Figure BDA0001811521380000131
Output drive signal to dual mode energy storage conversionAnd a device 11. Thus, the dual-mode energy storage converter 11 can operate in the VVSG control mode according to the driving signal. In yet another example, referring to fig. 4B, in the CDroop control scheme, as described in step four, the SVPWM modulation unit 229 modulates the wave according to the received modulation wave
Figure BDA0001811521380000132
And outputting a driving signal to the dual-mode energy storage converter 11. Therefore, the dual-mode energy storage converter 11 can work in the CDroop control mode according to the driving signal. In this embodiment, when it is determined that the control mode of the dual-mode energy storage converter needs to be switched, if the control mode is switched from the voltage source control mode to the current source control mode, the driving signal output to the dual-mode energy storage converter is referred to as a first driving signal. When the current source control mode is switched to the voltage source control mode, the driving signal output to the dual-mode energy storage converter is called a second driving signal.
The first drive signal and the second drive signal are exemplarily explained below by way of example.
Optionally, in an example, please refer to fig. 3A and fig. 3B. The adaptive mode switching scheme between the VVSG control mode and the CVSG control mode includes the following steps. The first step, the second step and the eighth step relate to switching between an off-grid mode and a grid-connected mode. Steps three to five involve switching the control mode of the dual-mode energy storage converter 11 from the VVSG control mode to the CVSG control mode. Steps six to seven involve switching the control mode of the dual-mode energy storage converter 11 from the CVSG control mode to the VVSG control mode.
The method comprises the following steps: the dual-mode energy storage converter 11 is set to run off the grid in a VVGG mode, and the phase theta of the grid voltage is adjustedgVoltage amplitude EgThe phase angle θ and the voltage amplitude E of the VVGG are used as the input of the synchronous control unit 130, and the synchronous control switch S is closed to calculate the phase and voltage amplitude synchronous signal ω of the VVGGres、Eres. The phase and voltage amplitude synchronous calculation equations are respectively as follows:
Figure BDA0001811521380000141
in the formula: k is a radical ofωIs the integral coefficient, k, of a phase-synchronous integratorEIs the integral coefficient of the amplitude synchronous integrator.
Step two: synchronizing phase and voltage amplitude signals omegares、EresThe angular frequency commands ω superimposed respectively to the VVGG0Voltage amplitude command ErefAfter the output voltage of the VVSG is synchronized with the grid voltage, the PCC switch is closed, the synchronization control switch S is opened, the phase synchronization integrator 1301 and the amplitude synchronization integrator 1302 are reset, and smooth switching of the dual-mode energy storage converter 11 from the off-grid mode to the grid-connected mode is completed.
Step three: after the dual-mode energy storage converter 11 is connected to the grid and stably operates in the VVSG mode, the coordination control unit 16 performs impedance detection on the alternating current power grid 14 to obtain a power grid impedance ZgAnd making an impedance condition Zg<Zmin、Zg>ZmaxAnd (4) judging.
Step four: if Z is satisfiedg<ZminAnd closing the synchronous control switch S to complete the real-time tracking of the VVSG output voltage and the power grid voltage. At this time, the output phase angle theta of VVSG and the voltage phase theta of CVSGgThe synchronization is maintained, and the input error signal of the voltage outer loop PI controller 126 is zero, and the current reference components of the d and q axes of the output current thereof
Figure BDA0001811521380000142
Automatically remain unchanged.
Step five: referencing d-axis current components of VVSG
Figure BDA0001811521380000143
q-axis current reference component
Figure BDA0001811521380000144
And d-axis current reference component of CVSG
Figure BDA0001811521380000145
q-axis current reference component
Figure BDA0001811521380000146
The current command is used as the input of a numerical value slow starter control equation to realize the real-time tracking of the current commands of the two, and the smooth switching from the VVSG to the CVSG running mode is completed. The numerical value slow starter control equation is as follows:
Figure BDA0001811521380000147
in the formula: Δ iLdAnd Δ iLqIs a set step length of the numerical slow starter, and
Figure BDA0001811521380000148
and T is the slow start time.
Figure BDA0001811521380000149
The component is performed for the d-axis current,
Figure BDA00018115213800001410
the component is performed for the q-axis current.
Performing a component based on d-axis current
Figure BDA00018115213800001411
And q-axis current executive component
Figure BDA00018115213800001412
Outputting a first driving signal. See steps three through four of the CVSG control scheme shown in fig. 3B. The first driving signal is a driving signal output by the SVPWM modulation unit 129.
Step six: after the dual-mode energy storage converter 11 is connected to the grid and stably operates in the CVSG mode, the coordination control unit 16 performs impedance detection on the alternating current power grid 14 to obtain power grid impedance ZgAnd making an impedance condition Zg<Zmin、Zg>ZmaxAnd (6) judging.
Step seven: if Z is satisfiedg>ZmaxReference component of d-axis current of CVSG
Figure BDA00018115213800001413
q-axis current reference component
Figure BDA00018115213800001414
And d-axis current reference component of VVSG
Figure BDA00018115213800001415
q-axis current reference component
Figure BDA00018115213800001416
The synchronous control switch S is used as the input of a numerical value slow starter control equation, the real-time tracking of current instructions of the numerical value slow starter and the numerical value slow starter is realized, the smooth switching from the CVSG to the VVSG running mode is completed, the synchronous control switch S is switched off, and the phase and amplitude synchronous integrator is reset. The numerical value slow starter control equation is as follows:
Figure BDA0001811521380000151
in the formula: Δ iLdAnd Δ iLqIs a set step length of the numerical slow starter, and
Figure BDA0001811521380000152
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA0001811521380000153
And q-axis current executive component
Figure BDA0001811521380000154
And outputting a second driving signal. See steps five through seven of the VVSG control scheme shown in fig. 3A. The second driving signal is the driving signal output by the SVPWM modulating unit 129.
Step eight: after the dual-mode energy storage converter 11 is stably operated in a VVGG mode in a grid connection mode, if the coordination control unit 16 detects a grid fault, the PCC switch is disconnected, the dual-mode energy storage converter keeps the VVGG mode in off-grid operation, smooth switching from grid connection to off-grid of the dual-mode energy storage converter is completed, and the operation is continued in the first step.
Wherein a d-axis current reference component in a voltage source control mode is obtained
Figure BDA0001811521380000155
q-axis current reference component
Figure BDA0001811521380000156
And d-axis current reference component in current source control mode
Figure BDA0001811521380000157
q-axis current reference component
Figure BDA0001811521380000158
The method can comprise the following steps:
and collecting the power grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter.
Acquiring d-axis current reference component in voltage source control mode according to power grid voltage, capacitor voltage and inductive current
Figure BDA0001811521380000159
q-axis current reference component
Figure BDA00018115213800001510
And d-axis current reference component in current source control mode
Figure BDA00018115213800001511
q-axis current reference component
Figure BDA00018115213800001512
See steps one-five of the VVSG control scheme shown in fig. 3A, or see steps one-two of the CVSG control scheme shown in fig. 3B.
The key of the smooth switching between the VVGG control mode and the CVSG control mode is as follows: keeping the current inner ring control structure unchanged in the two control modes and ensuring the output phase angle theta and the current reference instruction of the VVSG
Figure BDA00018115213800001513
Respectively with the voltage phase theta of CVSGgCurrent reference command
Figure BDA00018115213800001514
A smooth transition at the switching instant.
In the example, the CVSG control scheme with the frequency and voltage adjusting capability and the VSG control scheme with the frequency and voltage adjusting capability are applied to the three-phase dual-mode energy storage converter system, and the self-adaptive mode switching between the CVSG control mode and the VSG control mode can be realized according to the state change of the power grid, so that the adaptability and the operation stability of the dual-mode energy storage converter system to grid-on/off switching and strong and weak change of the power grid are improved.
Optionally, in yet another example, please refer to fig. 4A and 4B. The adaptive switching scheme between the Droop control mode and the CDroop control mode includes the following steps. The first step, the second step and the eighth step relate to switching between an off-grid mode and a grid-connected mode. Steps three to five involve switching the control mode of the dual-mode energy storage converter 21 from the Droop control mode to the CDroop control mode. Steps six to seven involve switching the control mode of the dual-mode energy storage converter 21 from the CDroop control mode to the Droop control mode.
The method comprises the following steps: setting the dual-mode energy storage converter 21 to run off the grid in a Droop mode, and enabling the phase theta of the grid voltagegVoltage amplitude EgThe output phase angle theta and the voltage amplitude E of the energy storage converter are used as the input of the synchronous control unit 230, the synchronous control switch S is closed, and the phase and voltage amplitude synchronous signal omega of the energy storage converter is calculatedres、Eres. The phase and voltage amplitude synchronous calculation equations are respectively as follows:
Figure BDA00018115213800001515
in the formula: k is a radical ofωIs the integral coefficient, k, of a phase-synchronous integratorEIntegrating amplitude synchronouslyThe integral coefficient of the device.
Step two: synchronizing phase and voltage amplitude signals omegares、EresRespectively superimposed to the angular frequency commands omega of the energy storage converter0Voltage amplitude command ErefAfter the output voltage of the energy storage converter is synchronized with the grid voltage, the PCC switch is closed, the synchronization control switch S is opened, the phase synchronization integrator 2301 and the amplitude synchronization integrator 2302 are reset, and smooth switching from the off-grid mode to the grid-connected mode of the dual-mode energy storage converter 21 is completed.
Step three: after the dual-mode energy storage converter 21 is connected to the grid in a Droop mode and stably operates, the coordination control unit 26 performs power grid impedance detection to obtain power grid impedance ZgAnd making an impedance condition Zg<Zmin、Zg>ZmaxAnd (4) judging.
Step four: if Z is satisfiedg<ZminAnd closing the synchronous control switch S to complete the real-time tracking of the output voltage of the energy storage converter and the voltage of the power grid. At this time, the output phase angle θ of the dual-mode energy storage converter 21 and the grid voltage phase θgThe synchronization is maintained, the input error signal of the current inner loop PI controller 227 is zero, and the output current d and q axis current reference components are
Figure BDA0001811521380000161
Automatically remain unchanged.
Step five: reference component of d-axis current of Droop
Figure BDA0001811521380000162
q-axis current reference component
Figure BDA0001811521380000163
And the d-axis current reference component of CDroopq-axis current reference component
Figure BDA0001811521380000165
As a numerical soft starter controlAnd (4) inputting an equation, realizing real-time tracking of the current instructions of the two, and finishing smooth switching from the Droop to the CDroop operation mode. The numerical value slow starter control equation is as follows:
Figure BDA0001811521380000166
in the formula: Δ iLdAnd Δ iLqIs a set step length of the numerical slow starter, and
Figure BDA0001811521380000167
and T is the slow start time.
Figure BDA0001811521380000168
The component is performed for the d-axis current,
Figure BDA0001811521380000169
the component is performed for the q-axis current.
Performing a component based on d-axis current
Figure BDA00018115213800001610
And q-axis current executive component
Figure BDA00018115213800001611
Outputting a first driving signal. See steps three through four of the CDroop control scheme shown in fig. 4B. The first driving signal is the driving signal output by the SVPWM modulation unit 229.
Step six: after the dual-mode energy storage converter 21 is connected to the grid in a CDroop mode and runs stably, the coordination control unit 26 detects the impedance of the power grid to obtain the impedance Z of the power gridgAnd making an impedance condition Zg<Zmin、Zg>ZmaxAnd (6) judging.
Step seven: if Z is satisfiedg>ZmaxReference component of the d-axis current of CDroop
Figure BDA00018115213800001612
q-axis current reference component
Figure BDA00018115213800001613
And d-axis current reference component of Droop
Figure BDA00018115213800001614
q-axis current reference component
Figure BDA00018115213800001615
And the current command is used as the input of a numerical value slow starter control equation to realize the real-time tracking of the current command and the numerical value slow starter control equation, complete the smooth switching from the CDroop to the Droop operation mode, simultaneously disconnect the synchronous control switch S, and reset the phase and amplitude synchronous integrator. The numerical value slow starter control equation is as follows:
Figure BDA00018115213800001616
in the formula: Δ iLdAnd Δ iLqIs a set step length of the numerical slow starter, and
Figure BDA00018115213800001617
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA00018115213800001618
And q-axis current executive component
Figure BDA00018115213800001619
And outputting a second driving signal. See steps five through seven of the Droop control scheme shown in fig. 4A. The second driving signal is the driving signal output by the SVPWM modulation unit 229.
Step eight: after the dual-mode energy storage converter 21 is stably operated in a Droop mode in a grid-connected mode, if the coordination control unit 26 detects a power grid fault, the PCC switch is switched off, the dual-mode energy storage converter keeps the Droop mode in off-grid operation, smooth switching from grid-connected to off-grid of the dual-mode energy storage converter is completed, and the operation is continued in the first step.
Wherein the d-axis current parameter in the voltage source control mode is obtainedAmount of examination
Figure BDA00018115213800001620
q-axis current reference component
Figure BDA00018115213800001621
And d-axis current reference component in current source control mode
Figure BDA00018115213800001622
q-axis current reference component
Figure BDA00018115213800001623
The method can comprise the following steps:
and collecting the power grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter.
Acquiring d-axis current reference component in voltage source control mode according to power grid voltage, capacitor voltage and inductive current
Figure BDA00018115213800001624
q-axis current reference component
Figure BDA00018115213800001625
And d-axis current reference component in current source control mode
Figure BDA00018115213800001626
q-axis current reference component
Figure BDA00018115213800001627
See steps one-five of the Droop control scheme shown in fig. 4A, or step one-step two of the CDroop control scheme shown in fig. 4B.
The key of smooth switching between the Droop control mode and the CDroop control mode is as follows: keeping the current inner loop control structure unchanged in the two control modes, and ensuring the output phase angle theta of the Droop and the current reference instruction
Figure BDA0001811521380000171
Respectively with the voltage phase theta of CDroopgCurrent reference command
Figure BDA0001811521380000172
A smooth transition at the switching instant.
In this example, a CDroop control scheme with frequency and voltage modulation and regulation capabilities and a Droop control scheme with frequency and voltage modulation and regulation capabilities are applied to the three-phase dual-mode energy storage converter system, and self-adaptive mode switching can be performed between a CDroop control mode and the Droop control mode according to state change of a power grid, so that adaptability of the dual-mode energy storage converter system to grid-on/off switching and strength change and operation stability of the power grid are improved.
The embodiment provides a control method of a dual-mode energy storage converter, which comprises the following steps: and acquiring an operation state value of the alternating current power grid, and switching the control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value. According to the control method of the dual-mode energy storage converter, the dual-mode energy storage converter can be adaptively switched between the voltage source control mode and the current source control mode according to the strength change of the power grid, and the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid are improved.
Fig. 6 is a flowchart of a control method of the dual-mode energy storage converter according to the second embodiment of the present application. On the basis of the first embodiment shown in fig. 5, the present embodiment provides a specific implementation manner of the control method of the dual-mode energy storage converter, and is specifically applied to a single-machine application scenario of the dual-mode energy storage converter. In this scenario, the number of dual-mode energy storage converters is 1, and N is equal to 1. For example, the current control mode of the dual-mode energy storage converter is a voltage source control mode, and the operation state value of the ac power grid is a grid impedance. As shown in fig. 6, the method for controlling a dual-mode energy storage converter provided in this embodiment may include:
s601, obtaining the grid impedance Z of the alternating current gridg。
Specifically, inAfter the dual-mode energy storage converter stably operates in a voltage source control mode, the grid impedance Z of the alternating current grid is obtainedg。
S602, judging the power grid impedance ZgWhether or not it is less than a first threshold value Zmin。
Wherein the first threshold value ZminAnd the grid impedance boundary value is used for switching the dual-mode energy storage converter from a voltage source control mode to a current source control mode.
If not, the power grid impedance ZgGreater than or equal to a first threshold value ZminThen, execution returns to S601.
If so, the grid impedance ZgLess than a first threshold value ZminThen S603 is executed.
And S603, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode.
And S604 is performed.
S604, obtaining the grid impedance Z of the alternating current gridg。
Specifically, after the dual-mode energy storage converter stably operates in a current source control mode, the grid impedance Zg of the alternating current grid is obtained.
S605, judging the impedance Z of the power gridgWhether or not it is greater than a second threshold value Zmax。
Wherein the second threshold value ZmaxAnd the grid impedance boundary value is used for switching the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
If not, the power grid impedance ZgLess than or equal to a second threshold value ZmaxThen, execution returns to S604.
If so, the grid impedance ZgGreater than a second threshold value ZmaxThen S606 is performed.
And S606, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
And returns to execution S601.
The embodiment provides a control method of a dual-mode energy storage converter, which is applied to a single-machine application scene of the dual-mode energy storage converter with only 1 dual-mode energy storage converter. According to the strength change of the power grid, the dual-mode energy storage converter is adaptively switched between a current source control mode and a voltage source control mode, so that the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid are improved.
Fig. 7 is a flowchart of a control method of the dual-mode energy storage converter according to the third embodiment of the present application. On the basis of the first embodiment shown in fig. 5, the present embodiment provides a specific implementation manner of the control method of the dual-mode energy storage converter, and is specifically applied to an application scenario of a parallel system of the dual-mode energy storage converter. In this scenario, the number of the dual-mode energy storage converters is multiple, and N is an integer greater than 1. The control mode of at least one dual-mode energy storage converter can be a voltage source control mode, and the control modes of the rest dual-mode energy storage converters can be current source control modes. For example, the operation state value of the ac power grid is taken as the grid impedance. As shown in fig. 7, the method for controlling a dual-mode energy storage converter provided in this embodiment may include:
s701, acquiring grid impedance Z of alternating current gridg。
Specifically, after each dual-mode energy storage converter operates stably, the grid impedance Z of the alternating current grid is obtainedg。
S702, judging the power grid impedance ZgWhether or not it is less than a first threshold value Zmin。
Wherein the first threshold value ZminAnd the grid impedance boundary value is used for switching the dual-mode energy storage converter from a voltage source control mode to a current source control mode.
If not, the power grid impedance ZgGreater than or equal to a first threshold value ZminThen S705 is executed.
If so, the grid impedance ZgLess than a first threshold value ZminThen S703 is executed.
And S703, switching the control mode of one dual-mode energy storage converter in the at least one dual-mode energy storage converter operated in the voltage source control mode from the voltage source control mode to the current source control mode.
After that, S704 is executed.
It should be noted that, how to determine the dual-mode energy storage converter that needs to be switched is not limited in the embodiment.
S704, obtaining the grid impedance Z of the alternating current gridg。
Specifically, after a dual-mode energy storage converter operating in a voltage source control mode is switched from the voltage source control mode to a current source control mode, and after each dual-mode energy storage converter operates stably, the grid impedance Z of the alternating current grid is obtainedg。
S705, judging the grid impedance ZgWhether or not it is greater than a second threshold value Zmax。
Wherein the second threshold value ZmaxAnd the grid impedance boundary value is used for switching the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
If not, the power grid impedance ZgLess than or equal to a second threshold value ZmaxThen S701 or S702 is executed.
Specifically, if the step before S705 is S702, S701 is executed. If the step before S705 is S704, S702 is executed.
If so, the grid impedance ZgGreater than a second threshold value ZmaxThen S706 is performed.
And S706, switching the control mode of one dual-mode energy storage converter in the at least one dual-mode energy storage converter operated in the current source control mode from the current source control mode to the voltage source control mode.
After that, execution returns to S701.
It should be noted that, how to determine the dual-mode energy storage converter that needs to be switched is not limited in the embodiment. For example, the dual-mode energy storage converter which has been switched to the current source control mode last time may be determined as the dual-mode energy storage converter which needs to be switched.
The embodiment provides a control method of a dual-mode energy storage converter, which is applied to an application scenario that the dual-mode energy storage converter is a parallel system of a plurality of dual-mode energy storage converters. According to the strength change of the power grid, any one dual-mode energy storage converter is adaptively switched between a current source control mode and a voltage source control mode, so that the adaptability and the operation stability of the dual-mode energy storage converter system to the strength change of the power grid are improved.
Fig. 8 is a schematic structural diagram of a control device of a dual-mode energy storage converter according to an embodiment of the present application. The control device of the dual-mode energy storage converter provided by the embodiment is used for executing the control method of the dual-mode energy storage converter provided by the embodiment shown in fig. 5 or fig. 6. As shown in fig. 8, the control device of the dual-mode energy storage converter provided in this embodiment is applied to the dual-mode energy storage converter, and the number of the dual-mode energy storage converters may be 1. The control device of the dual-mode energy storage converter can comprise: the control unit 19 and the dual-mode energy storage converter control unit 18 are coordinated, and the dual-mode energy storage converter control unit 18 comprises a voltage source control unit 181 and a current source control unit 182. The number of the dual-mode energy storage converters is 1, the number of the dual-mode energy storage converter control units is 1, and the dual-mode energy storage converters correspond to the dual-mode energy storage converter control units one to one.
And the voltage source control unit 181 is configured to control a control mode of the dual-mode energy storage converter to be a voltage source control mode.
And the current source control unit 182 is used for controlling the control mode of the dual-mode energy storage converter to be a current source control mode.
And the coordination control unit 19 is used for acquiring the running state value of the alternating current power grid. And switching the control mode of the dual-mode energy storage converter between a voltage source control mode and a current source control mode according to the operation state value.
The voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
Optionally, the coordination control unit 19 is specifically configured to:
and if the running state value meets the condition of converting the preset voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode.
And if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
Optionally, the current source control unit 182 is specifically configured to:
and outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode.
The voltage source control unit 181 is specifically configured to:
and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
Optionally, the current source control unit 182 is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA0001811521380000191
q-axis current reference component
Figure BDA0001811521380000192
And d-axis current reference component in voltage source control mode
Figure BDA0001811521380000193
q-axis current reference component
Figure BDA0001811521380000194
From d-axis current reference component
Figure BDA0001811521380000195
q-axis current reference component
Figure BDA0001811521380000196
d-axis current reference component
Figure BDA0001811521380000197
And q-axis current reference component
Figure BDA0001811521380000198
Using numerical slow starter control equations
Figure BDA0001811521380000199
Obtaining d-axis current executive component
Figure BDA00018115213800001910
And q-axis current executive component
Figure BDA00018115213800001911
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800001912
Figure BDA00018115213800001913
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA00018115213800001914
And q-axis current executive component
Figure BDA00018115213800001915
Outputting a first driving signal.
Optionally, the voltage source control unit 181 is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA00018115213800001916
q-axis current reference component
Figure BDA00018115213800001917
And d-axis current reference component in voltage source control mode
Figure BDA0001811521380000201
q-axis current reference component
Figure BDA0001811521380000202
From d-axis current reference component
Figure BDA0001811521380000203
q-axis current reference component
Figure BDA0001811521380000204
d-axis current reference component
Figure BDA0001811521380000205
And q-axis current reference component
Figure BDA0001811521380000206
Using numerical slow starter control equations
Figure BDA0001811521380000207
Obtaining d-axis current executive component
Figure BDA0001811521380000208
And q-axis current executive component
Figure BDA0001811521380000209
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800002010
Figure BDA00018115213800002011
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA00018115213800002012
And q-axis current executive component
Figure BDA00018115213800002013
And outputting a second driving signal.
Optionally, the dual-mode energy storage converter control unit 18 further includes a voltage and current sampling unit 183.
And the voltage and current sampling unit 183 is used for collecting the grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter.
The voltage source control unit 181 or the current source control unit 182 is specifically configured to obtain the d-axis current reference component in the voltage source control mode according to the grid voltage, the capacitor voltage, and the inductor current
Figure BDA00018115213800002014
q-axis current reference component
Figure BDA00018115213800002015
And d-axis current reference component in voltage source control mode
Figure BDA00018115213800002016
q-axis current reference component
Figure BDA00018115213800002017
Optionally, the operating state value is a grid impedance.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is less than a first threshold.
Presetting current source to voltage source conditions, comprising: the operating condition value is greater than a second threshold value.
Wherein the first threshold is less than the second threshold.
Optionally, the operating condition value is a short circuit ratio.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is greater than a third threshold value.
Presetting current source to voltage source conditions, comprising: the operating condition value is less than a fourth threshold value.
Wherein the third threshold is greater than the fourth threshold.
The following is a description by specific examples.
Alternatively, in one example, the control device for the dual mode energy storage converter can be seen in fig. 3A and 3B. The coordination control unit 19 may refer to the coordination control unit 16. The dual mode energy storage converter control unit 18 includes a voltage source control unit 181 and a current source control unit 182. The voltage source control unit 181 can be referred to as the voltage source control unit 12 in fig. 3A, and includes: the phase-locked loop control system comprises a phase-locked loop 121, a coordinate transformation unit 122, a power calculation unit 123, an active-frequency control unit 124, a reactive-voltage control unit 125, a voltage outer loop PI controller 126, a current inner loop PI controller 127, a coordinate transformation unit 128, an SVPWM modulation unit 129 and a synchronous control unit 130. The current source control unit 182 may refer to the current source control unit 22 in fig. 3B, and includes: a phase-locked loop 121, a coordinate transformation unit 122, a CVSG control unit 131, a current inner loop PI controller 127, a coordinate transformation unit 128, and an SVPWM modulation unit 129. Alternatively, the same units may be multiplexed. For example, the phase-locked loop 121, the coordinate transformation unit 122, the current inner loop PI controller 127, the coordinate transformation unit 128 and the SVPWM modulation unit 129 in fig. 3A and 3B may be multiplexed, and may be one unit in the control device of the dual-mode energy storage converter.
Alternatively, in yet another example, the control device of the dual mode energy storage converter can be seen in fig. 4A and 4B. The coordination control unit 19 may refer to the coordination control unit 26. The dual mode energy storage converter control unit 18 includes a voltage source control unit 181 and a current source control unit 182. The voltage source control unit 181 can be referred to as the voltage source control unit 32 in fig. 4A, and includes: the phase-locked loop 221, the coordinate transformation unit 222, the power calculation unit 223, the active-frequency droop control unit 224, the reactive-voltage droop control unit 225, the voltage outer loop PI controller 226, the current inner loop PI controller 227, the coordinate transformation unit 228, the SVPWM modulation unit 229, and the synchronization control unit 230. The current source control unit 182 may refer to the current source control unit 42 in fig. 4B, and includes: a phase-locked loop 221, a coordinate transformation unit 222, a CDroop control unit 231, a current inner loop PI controller 227, a coordinate transformation unit 228, and an SVPWM modulation unit 229. Alternatively, the same units may be multiplexed. For example, the phase-locked loop 221, the coordinate transformation unit 222, the current inner loop PI controller 227, the coordinate transformation unit 228, and the SVPWM modulation unit 229 in fig. 4A and 4B may be multiplexed, and may be one unit in the control device of the dual-mode energy storage converter.
It should be noted that, in the examples shown in fig. 3A, 3B, 4A and 4B, since the voltage source control unit and the voltage source control unit include a large number of units, in order to explain the switching principle between the virtual synchronous generator voltage source control mode, the virtual synchronous generator current source control mode, the virtual synchronous generator voltage source control mode and the virtual synchronous generator current source control mode, the droop control mode, the inverted droop control mode, and the droop control mode and the inverted droop control mode, respectively, only the voltage source control unit 12 is shown in fig. 3A, only the current source control unit 22 is shown in fig. 3B, only the voltage source control unit 32 is shown in fig. 4A, and only the current source control unit 42 is shown in fig. 4B. The control device of the dual-mode energy storage converter and the control unit 18 of the dual-mode energy storage converter can refer to fig. 3A and 3B simultaneously, or refer to fig. 4A and 4B simultaneously.
The control device of the dual-mode energy storage converter provided in this embodiment is used for executing the control method of the dual-mode energy storage converter provided in the embodiment shown in fig. 5 or fig. 6, and its technical principle and technical effect are similar, and are not described herein again.
Fig. 9 is a schematic structural diagram of a control device of a dual-mode energy storage converter according to a second embodiment of the present application. The control device of the dual-mode energy storage converter provided by the embodiment is used for executing the control method of the dual-mode energy storage converter provided by the embodiment shown in fig. 5 or fig. 7. As shown in fig. 9, the control device of the dual-mode energy storage converter provided in this embodiment is applied to the dual-mode energy storage converter, where the number of the dual-mode energy storage converters may be N, where N is an integer greater than 1. The control device of the dual-mode energy storage converter can comprise: a coordination control unit 19 and N dual-mode energy storage converter control units 18. The N dual-mode energy storage converters correspond to the N dual-mode energy storage converter control units 18 one to one. The dual mode energy storage converter control unit 18 includes a voltage source control unit 181 and a current source control unit 182.
And the voltage source control unit 181 is configured to control a control mode of the dual-mode energy storage converter corresponding to the voltage source control unit 181 to be a voltage source control mode.
And the current source control unit 182 is used for controlling the control mode of the dual-mode energy storage converter corresponding to the current source control unit 182 to be a current source control mode.
And the coordination control unit 19 is used for acquiring the running state value of the alternating current power grid. And switching the control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
The voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
Optionally, the coordination control unit 19 is specifically configured to:
and switching the control mode of one of the dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value.
Optionally, the control mode of P dual-mode energy storage converters of the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters other than the P dual-mode energy storage converters is a current source control mode. P + Q is N, P is not less than 0, and Q is not less than 0.
The coordination control unit 19 is specifically configured to:
and if the running state value meets the condition of converting the preset voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode.
And if the running state value meets the condition of converting the preset current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
Optionally, the current source control unit 182 is specifically configured to:
and outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode.
The voltage source control unit 181 is specifically configured to:
and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
Optionally, the current source control unit 182 is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA0001811521380000221
q-axis current reference component
Figure BDA0001811521380000222
And d-axis current reference component in voltage source control mode
Figure BDA0001811521380000223
q-axis current reference component
Figure BDA0001811521380000224
From d-axis current reference component
Figure BDA0001811521380000225
q-axis current reference component
Figure BDA0001811521380000226
d-axis current reference component
Figure BDA0001811521380000227
And q-axis current reference component
Figure BDA0001811521380000228
Using numerical slow starter control equations
Figure BDA0001811521380000229
Obtaining d-axis current executive component
Figure BDA00018115213800002210
And q-axis current executive component
Figure BDA00018115213800002211
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800002212
Figure BDA00018115213800002213
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA00018115213800002214
And q-axis current executive component
Figure BDA00018115213800002215
Outputting a first driving signal.
Optionally, the voltage source control unit 181 is specifically configured to:
obtaining d-axis current reference component in voltage source control mode
Figure BDA00018115213800002216
q-axis current reference component
Figure BDA00018115213800002217
And d-axis current reference component in voltage source control mode
Figure BDA00018115213800002218
q-axis current reference component
Figure BDA00018115213800002219
From d-axis current reference component
Figure BDA00018115213800002220
q-axis current reference component
Figure BDA00018115213800002221
d-axis current reference component
Figure BDA00018115213800002222
And q-axis current reference component
Figure BDA00018115213800002223
Using numerical slow starter control equations
Figure BDA00018115213800002224
Obtaining d-axis current executive component
Figure BDA00018115213800002225
And q-axis current executive component
Figure BDA00018115213800002226
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure BDA00018115213800002227
Figure BDA00018115213800002228
and T is the slow start time.
Performing a component based on d-axis current
Figure BDA00018115213800002229
And q-axis current executive component
Figure BDA00018115213800002230
And outputting a second driving signal.
Optionally, the dual-mode energy storage converter control unit 18 further includes a voltage and current sampling unit 183.
And the voltage and current sampling unit 183 is used for collecting the grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter.
Voltage ofThe source control unit 181 or the current source control unit 182 is specifically configured to obtain a d-axis current reference component in a voltage source control mode according to the grid voltage, the capacitor voltage, and the inductor current
Figure BDA00018115213800002231
q-axis current reference component
Figure BDA00018115213800002232
And d-axis current reference component in voltage source control mode
Figure BDA00018115213800002233
q-axis current reference component
Figure BDA00018115213800002234
Optionally, the operating state value is a grid impedance.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is less than a first threshold.
Presetting current source to voltage source conditions, comprising: the operating condition value is greater than a second threshold value.
Wherein the first threshold is less than the second threshold.
Optionally, the operating condition value is a short circuit ratio.
Presetting a voltage source to current source conversion condition, comprising: the operating condition value is greater than a third threshold value.
Presetting current source to voltage source conditions, comprising: the operating condition value is less than a fourth threshold value.
Wherein the third threshold is greater than the fourth threshold.
The control device of the dual-mode energy storage converter provided in this embodiment is used for executing the control method of the dual-mode energy storage converter provided in the embodiment shown in fig. 5 or fig. 7, and its technical principle and technical effect are similar, and are not described herein again.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the determining module may be a processing element separately set up, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the determining module is called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when some of the above modules are implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can call program code. As another example, these modules may be integrated together, implemented in the form of a system-on-a-chip (SOC).
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

Claims (16)

1. A method of controlling a dual-mode energy storage converter, comprising:
acquiring an operation state value of an alternating current power grid;
switching the control mode of at least one dual-mode energy storage converter in the N dual-mode energy storage converters between a voltage source control mode and a current source control mode according to the operation state value; wherein N is a positive integer;
the voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
2. The method of claim 1, wherein N is equal to 1, and wherein switching the control mode of at least one of the N dual-mode energy storage converters between a voltage source control mode and a current source control mode based on the operating state value comprises:
if the running state value meets the condition of converting the voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode;
and if the running state value meets the condition of converting the current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
3. The method of claim 1, wherein N is greater than 1, and wherein switching the control mode of at least one of the N dual-mode energy storage converters between a voltage source control mode and a current source control mode based on the operating state value comprises:
and switching the control mode of one dual-mode energy storage converter between the voltage source control mode and the current source control mode according to the operation state value.
4. The method according to claim 3, wherein the control mode of P dual-mode energy storage converters in the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters except the P dual-mode energy storage converters is a current source control mode; p + Q is N, P is not less than 0, and Q is not less than 0;
the switching the control mode of one of the dual-mode energy storage converters between the voltage source control mode and the current source control mode according to the operation state value comprises:
if the operating state value meets the condition of converting the voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode;
and if the running state value meets the condition of converting the current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
5. The method of claim 2 or 4, wherein the switching of the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode comprises:
outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode;
the control mode of the dual-mode energy storage converter is switched from the current source control mode to the voltage source control mode, and the control mode comprises the following steps:
and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
6. The method of claim 5, wherein outputting the first drive signal to the dual-mode energy storage converter comprises:
obtaining a d-axis current reference component in the voltage source control mode
Figure FDA0001811521370000011
q-axis current reference component
Figure FDA0001811521370000012
And a d-axis current reference component in the current source control mode
Figure FDA0001811521370000021
q-axis current reference component
Figure FDA0001811521370000022
According to the d-axis current reference component
Figure FDA0001811521370000023
The q-axis current reference component
Figure FDA0001811521370000024
The d-axis current reference component
Figure FDA0001811521370000025
And said q-axis current reference component
Figure FDA0001811521370000026
Using numerical slow starter control equations
Figure FDA0001811521370000027
Obtaining d-axis current executive component
Figure FDA0001811521370000028
And q-axis current executive component
Figure FDA0001811521370000029
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure FDA00018115213700000210
t is slow starting time;
performing a component according to the d-axis current
Figure FDA00018115213700000211
And said q-axis current executive component
Figure FDA00018115213700000212
And outputting the first driving signal.
7. The method of claim 5, wherein outputting a second drive signal to the dual-mode energy storage converter comprises:
obtaining a d-axis current reference score in the voltage source control modeMeasurement of
Figure FDA00018115213700000213
q-axis current reference component
Figure FDA00018115213700000214
And a d-axis current reference component in the current source control mode
Figure FDA00018115213700000215
q-axis current reference component
Figure FDA00018115213700000216
According to the d-axis current reference component
Figure FDA00018115213700000217
The q-axis current reference component
Figure FDA00018115213700000218
The d-axis current reference component
Figure FDA00018115213700000219
And said q-axis current reference component
Figure FDA00018115213700000220
Using numerical slow starter control equations
Figure FDA00018115213700000221
Obtaining d-axis current executive component
Figure FDA00018115213700000222
And q-axis current executive component
Figure FDA00018115213700000223
Wherein, Δ iLdAnd Δ iLqFor a set step size of the numerical slow starter,
Figure FDA00018115213700000224
t is slow starting time;
performing a component according to the d-axis current
Figure FDA00018115213700000225
And said q-axis current executive component
Figure FDA00018115213700000226
And outputting the second driving signal.
8. Method according to claim 6 or 7, wherein said obtaining a d-axis current reference component in said voltage source control mode
Figure FDA00018115213700000227
q-axis current reference component
Figure FDA00018115213700000228
And a d-axis current reference component in the current source control mode
Figure FDA00018115213700000229
q-axis current reference component
Figure FDA00018115213700000230
The method comprises the following steps:
collecting the power grid voltage, the capacitor voltage and the inductive current output by the dual-mode energy storage converter;
obtaining d-axis current reference components in the voltage source control mode according to the power grid voltage, the capacitor voltage and the inductor current
Figure FDA00018115213700000231
q-axis current reference component
Figure FDA00018115213700000232
And a d-axis current reference component in the current source control mode
Figure FDA00018115213700000233
q-axis current reference component
Figure FDA00018115213700000234
9. The method according to claim 2 or 4, characterized in that the operating state value is a grid impedance;
the preset voltage source to current source conversion condition comprises: the operating state value is less than a first threshold value;
the preset current source to voltage source conversion condition comprises: the operating state value is greater than a second threshold value;
wherein the first threshold is less than the second threshold.
10. The method of claim 2 or 4, wherein the operating condition value is a short circuit ratio;
the preset voltage source to current source conversion condition comprises: the operating state value is greater than a third threshold value;
the preset current source to voltage source conversion condition comprises: the operating state value is less than a fourth threshold value;
wherein the third threshold is greater than the fourth threshold.
11. A control device of a dual-mode energy storage converter is applied to the dual-mode energy storage converter, and is characterized by comprising the following components: the dual-mode energy storage converter control unit comprises a coordination control unit and a dual-mode energy storage converter control unit, wherein the dual-mode energy storage converter control unit comprises a voltage source control unit and a current source control unit; the number of the dual-mode energy storage converters is N, the number of the dual-mode energy storage converter control units is N, the N dual-mode energy storage converters correspond to the N dual-mode energy storage converter control units one by one, and N is a positive integer;
the voltage source control unit is used for controlling the control mode of the dual-mode energy storage converter corresponding to the voltage source control unit to be a voltage source control mode;
the current source control unit is used for controlling the control mode of the dual-mode energy storage converter corresponding to the current source control unit to be a current source control mode;
the coordination control unit is used for acquiring an operation state value of the alternating current power grid; switching a control mode of at least one of the N dual-mode energy storage converters between the voltage source control mode and the current source control mode according to the operating state value;
the voltage source control mode is a virtual synchronous generator voltage source control mode and the current source control mode is a virtual synchronous generator current source control mode, or the voltage source control mode is a droop control mode and the current source control mode is a droop control mode.
12. The apparatus according to claim 11, wherein N is equal to 1, and wherein the coordination control unit is specifically configured to:
if the running state value meets the condition of converting the voltage source into the current source, switching the control mode of the dual-mode energy storage converter from the voltage source control mode to the current source control mode;
and if the running state value meets the condition of converting the current source into the voltage source, switching the control mode of the dual-mode energy storage converter from the current source control mode to the voltage source control mode.
13. The apparatus according to claim 11, wherein N is greater than 1, and the coordination control unit is specifically configured to:
and switching the control mode of one dual-mode energy storage converter between the voltage source control mode and the current source control mode according to the operation state value.
14. The apparatus according to claim 13, wherein the control mode of P dual-mode energy storage converters of the N dual-mode energy storage converters is a voltage source control mode, and the control mode of Q dual-mode energy storage converters other than the P dual-mode energy storage converters is a current source control mode; p + Q is N, P is not less than 0, and Q is not less than 0;
the coordination control unit is specifically configured to:
if the operating state value meets the condition of converting the voltage source into the current source, switching the control mode of one dual-mode energy storage converter in the P dual-mode energy storage converters from the voltage source control mode to the current source control mode;
and if the running state value meets the condition of converting the current source into the voltage source, switching the control mode of one dual-mode energy storage converter in the Q dual-mode energy storage converters from the current source control mode to the voltage source control mode.
15. The apparatus of claim 12 or 14,
the current source control unit is specifically configured to:
outputting a first driving signal to the dual-mode energy storage converter, wherein the first driving signal is used for controlling the dual-mode energy storage converter to work in a current source control mode;
the voltage source control unit is specifically configured to:
and outputting a second driving signal to the dual-mode energy storage converter, wherein the second driving signal is used for controlling the dual-mode energy storage converter to work in a voltage source control mode.
16. A dual-mode energy storage converter system, comprising: a dual mode energy storage converter and control apparatus for a dual mode energy storage converter as claimed in any one of claims 11 to 15.
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