CN116995693A - Method for controlling energy storage virtual inertia of network super capacitor - Google Patents
Method for controlling energy storage virtual inertia of network super capacitor Download PDFInfo
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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Abstract
The invention provides a method for controlling virtual inertia of a network super capacitor energy storage, which comprises the steps of constructing a new energy storage micro-grid; by configuring the super capacitor in the new energy storage micro-grid, the electric energy is quickly released/absorbed; the high-pass filter is introduced into the new energy storage micro-grid to keep the voltage of the direct-current bus stable; and the inertia control of the new energy storage micro-grid is realized through the super capacitor and the high-pass filter. By the method provided by the invention, the voltage of the direct-current bus can be kept stable by the new energy storage micro-grid on the basis of not changing the energy storage inertia support of the super capacitor.
Description
Technical Field
The invention belongs to the field of novel net-structured energy storage.
Background
In response to the "peak-to-carbon, carbon-neutral" macroscopic energy policy, new power systems based on new energy are currently being built. The new energy power generation uses a large amount of power electronic equipment, and the traditional power electronic equipment can not provide moment of inertia similar to that of a rotating motor for a power system, so that the power system can seriously weaken the frequency adjustment capability, the frequency disturbance caused by power fluctuation can not be restrained, and even the new energy is off-grid in a large area, so that the stability of the power system is seriously influenced.
The energy storage and wind power, photovoltaic and other new energy sources adopt a direct current networking mode, so that the interconnection between the energy storage and the new energy sources is simple and efficient, the reactive power optimization problem is not required to be considered in the direct current networking mode, and harmonic pollution is avoided. Strategies such as virtual inertia control, sagging control, virtual synchronous machines and the like are adopted in the DC/AC converter of the new energy storage micro-grid, so that virtual inertia support can be provided for the micro-grid, and the micro-grid has frequency adjustment capability. In the existing method 1, a virtual inertia response module is added in the frequency control link of the micro-grid converter, so that the output frequency of the micro-grid is consistent with the frequency change deviation rate of the large grid, and the instantaneous response of the frequency deviation is realized by absorbing/releasing energy through energy storage in the micro-grid. In order to improve the synchronous inertia supporting capability of the system, the existing method 2 introduces frequency differential signals into the energy storage converter control system to realize inertia simulation, and further adds a robust controller to improve the energy storage output frequency characteristic. The literature analyzes the frequency oscillation mechanism of the regional power grid caused by power unbalance of the transmitting end and the receiving end, adopts a virtual synchronous machine control strategy, characterizes virtual inertia by using a frequency difference change rate, and improves the inertia supporting performance of the virtual synchronous machine on the power grid.
The power electronic equipment in the direct current micro-grid is connected through a direct current bus, the direct current voltage is stably maintained in a certain range, and the direct current micro-grid has voltage regulation robustness in the face of power fluctuation, so that the direct current micro-grid is a research focus in the field of grid-connected converter inertia control. The existing method 3 provides an inertia control scheme for simulating a virtual direct current motor, the virtual inertia is represented by a direct current voltage change rate, and the accelerating voltage for adaptively adjusting the virtual inertia is recovered to a steady state. In the prior art 4, by analyzing the characteristics of the angle of the energy storage system before and after the voltage drop fault, the acceleration area is reduced as a control target, and series of measures are provided to maintain the stability of the energy storage output voltage during the fault. In the existing method 5, the direct current bus voltage of the new energy microgrid is used as a negative feedback signal to be introduced into an integration link in the outer ring of the voltage of the grid-connected converter, and the line impedance is replaced by the adjustable virtual impedance, so that the dynamic adjustment of the direct current voltage is realized.
However, there are a number of problems with the existing methods: when the DC/AC converter of the new energy storage micro-grid is subjected to frequency fluctuation caused by load switching, transient virtual inertia support can be provided through direct-current side super capacitor energy storage. In the frequency recovery stage, if fluctuation exists all the time, the voltage of the direct current bus cannot be recovered to an initial value, and if the load is continuously switched on/off in a low voltage/high voltage state, the new energy storage micro-grid is off-grid due to the fact that the voltage is too low/too high, and the stable operation of the power system is seriously affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the invention aims to provide a grid-structured super capacitor energy storage virtual inertia control method which is used for enabling a new energy storage micro-grid to keep stable voltage of a direct current bus on the basis of not changing the support of the super capacitor energy storage inertia.
In order to achieve the above objective, an embodiment of a first aspect of the present invention provides a method for controlling energy storage virtual inertia of a network super capacitor, including:
constructing a new energy storage micro-grid;
by configuring the super capacitor in the new energy storage micro-grid, the electric energy is quickly released/absorbed;
the high-pass filter is introduced into the new energy storage micro-grid to keep the voltage of the direct-current bus stable;
and the inertia control of the new energy storage micro-grid is realized through the super capacitor and the high-pass filter.
In addition, the method for controlling the energy storage virtual inertia of the network super capacitor according to the above embodiment of the present invention may further have the following additional technical features:
further, in one embodiment of the present invention, the constructing a new energy storage micro-grid includes:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc is the DC inertia gain.
Further, in an embodiment of the present invention, the step of maintaining the voltage of the dc bus stable by introducing a high-pass filter into the new energy storage micro-grid includes:
defining a direct current inertia gain:
，
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively.
In order to achieve the above objective, an embodiment of a second aspect of the present invention provides a network super capacitor energy storage virtual inertia control device, which includes the following modules:
the construction module is used for constructing a new energy storage micro-grid;
the configuration module is used for rapidly releasing/absorbing electric energy by configuring the super capacitor in the new energy storage micro-grid;
the recovery module is used for keeping the voltage of the direct current bus stable by introducing a high-pass filter into the new energy storage micro-grid;
and the control module is used for controlling the inertia of the new energy storage micro-grid through the super capacitor and the high-pass filter.
Further, in an embodiment of the present invention, the building block is further configured to:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc is the DC inertia gain.
Further, in an embodiment of the present invention, the step of maintaining the voltage of the dc bus stable by introducing a high-pass filter into the new energy storage micro-grid includes:
defining a direct current inertia gain:
，
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively.
To achieve the above object, an embodiment of the present invention provides a computer device, which is characterized by comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the processor implements a method for controlling energy storage virtual inertia of a network super capacitor as described above when executing the computer program.
To achieve the above object, a fourth aspect of the present invention provides a computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements a method for controlling energy storage virtual inertia of a network super capacitor as described above.
According to the network-structured super-capacitor energy storage virtual inertia control method provided by the embodiment of the invention, the new energy storage micro-grid keeps the voltage of the direct-current bus stable on the basis of not changing the support of the super-capacitor energy storage inertia.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic flow chart of a method for controlling energy storage virtual inertia of a network super capacitor according to an embodiment of the present invention.
Fig. 2 is a topological diagram of a new energy storage dc micro-grid provided by an embodiment of the present invention.
Fig. 3 is a graph showing a frequency fluctuation interval caused by load input according to an embodiment of the present invention.
FIG. 4 is a block diagram of a virtual inertia current inner loop control according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a dc bus voltage deviation response curve according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart of a network super capacitor energy storage virtual inertia control device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The method for controlling the energy storage virtual inertia of the network-structured super capacitor according to the embodiment of the invention is described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for controlling energy storage virtual inertia of a network super capacitor according to an embodiment of the present invention.
As shown in fig. 1, the method for controlling the virtual inertia of the energy storage of the network super capacitor comprises the following steps:
s101: constructing a new energy storage micro-grid;
s102: by configuring the super capacitor in the new energy storage micro-grid, the electric energy is quickly released/absorbed;
s103: the high-pass filter is introduced into the new energy storage micro-grid to keep the voltage of the direct-current bus stable;
s104: and the inertia control of the new energy storage micro-grid is realized through the super capacitor and the high-pass filter.
Further, in one embodiment of the present invention, constructing a new energy storage micro-grid includes:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc is the DC inertia gain.
As shown in fig. 2, the topology structure of the new energy dc micro-grid typically contains super capacitor energy storage. The photovoltaic panel is connected with a direct current bus through a DC/DC converter, and is used for outputting powerP PV A representation; the fan is connected with a direct current bus through an AC/DC rectifying device for outputting powerP W A representation; the super capacitor is connected with a direct current bus through a DC/DC converter device for absorbing/releasing powerP C A representation; and configuring a direct current load in the direct current micro-grid. The DC bus is connected with an AC main network through a DC/AC converter and a power frequency boost transformer, and an AC load is configured on an AC transmission line. DC micro-grid and AC grid power exchangePAnd (3) representing. The load switching can cause the frequency fluctuation of the grid-connected DC/AC converter of the direct-current micro-grid, further cause the voltage fluctuation of a direct-current bus and influence the stable operation of the direct-current micro-grid. By configuring the super capacitor energy storage to quickly release/absorb electric energy and adopting an analog inertia algorithm in the grid-connected DC/AC converter, the inertia supporting capacity of the direct current micro-grid can be improved.
The invention adopts an inertia control method of a simulated rotary synchronous motor in a micro-grid-connected DC/AC converter. Rotor rotational kinetic energy of rotary synchronous motorE k Can be expressed as:
，（1）
in the formula (1):pthe pole pair number of the motor is;J sg 、ω sg the rotational inertia and the mechanical angular velocity of the motor are respectively. Inertia of rotary synchronous motorHThe method comprises the following steps:
，（2）
in the formula (2):ω n 、S N the rated mechanical angular speed and rated capacity of the motor are respectively. From formula (2), it can be seen that: inertia of rotary synchronous motorHOnly the kinetic energy and rated capacity of the motor during rated rotation speed operation are related, and the motor is not influenced by power variation.
Rotational kinetic energyE k Deriving time and introducing inertiaHThe motion equation of the rotor of the rotary synchronous motor can be obtained as follows:
，（3）
in the formula (3):P、P m 、P e the output power, the mechanical power and the electromagnetic power of the rotary synchronous motor are respectively;ω 0 、ωthe initial mechanical angular velocity and the current mechanical angular velocity, respectively.
The super capacitor is arranged in the direct current micro-grid to provide kinetic energy required by analog inertia, and the super capacitor releases/absorbs electric energy through voltage transformation, and charges and discharges powerP c Can be expressed as:
，（4）
in the formula (4):C、S c 、u c the energy storage capacitance value, the rated capacity and the output voltage of the super capacitor are respectively. The super capacitor energy storage charging/electricity can simulate the motion equation of the rotor of the rotary synchronous motor, namely the combined type (3) and the combined type (4), and the super capacitor inertia support equation can be obtained as follows:
，（5）
in formula (5):H c the virtual inertia is stored for the super capacitor;ω c0 、ω c the method comprises the steps of respectively storing an initial virtual angular frequency and a current virtual angular frequency for the super capacitor, wherein the access operation time is as follows:ω c0 =ω 0 、ω c =ω. In order to restore the frequency change of the micro-grid by detecting the direct-current voltage, the invention adopts a direct-current voltage-frequency virtual inertia control scheme in the DC/AC converter of the new energy storage micro-grid, which can be expressed as follows:
，（6）
in formula (6):U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively.K dc Is the DC inertia gain. The super capacitor energy storage is connected with a direct current bus through a DC/DC converter, and the output voltage of the super capacitor energy storage is consistent with the voltage of the direct current bus, namely:. The direct inertia gain obtained by combining the equation (5) and the equation (6) can be expressed as:
。（7）
the DC voltage-frequency virtual inertia control scheme is adopted in the DC/AC converter of the new energy storage micro-grid, inertia support can be provided for a power system, but frequency disturbance caused by load switching is different, fixed virtual inertia gain is set, dynamic response of simulated inertia according to frequency change cannot be realized, and in particular, in a frequency recovery stage, larger virtual inertia is unfavorable for frequency recovery. The loading input herein causes a frequency drop and frequency recovery into four regions, as depicted in fig. 3.
In fig. 3, the four regions correspond to frequency down, frequency recovery, frequency overshoot, and frequency stabilization, respectively. In order to solve the problem of inflexibility of frequency adjustment caused by constant virtual inertia, conventional virtual inertia control is improved, virtual inertia is automatically increased according to the ascending/descending amplitude of frequency, large virtual inertia can inhibit frequency fluctuation (area I and area III), virtual inertia is reduced in the frequency recovery stage, and frequency recovery (area II and area IV) is accelerated. The zone division and inertia adjustment are shown in table 1.
TABLE 1
| Region(s) | Δω | dω/dt | Δω(dω/dt) | Hc |
| Ⅰ | － | － | ＋ | Increase in size |
| Ⅱ | － | ＋ | － | Reduction of |
| Ⅲ | ＋ | ＋ | ＋ | Properly enlarge |
| Ⅳ | ＋ | － | － | Properly reduced |
From the creation of a new virtual inertia, it can be expressed as:
，（8）
in formula (8):H c0 is an initial virtual inertia;is a virtual frequency adjustment quantity; />、/>Frequency deviation threshold and frequency change rate threshold, respectively, < ->、/>The value is determined according to the characteristics of the converter;k H the coefficients are adjusted for virtual inertia.
In order to set the initial virtual inertia and the virtual inertia adjustment coefficient parameters, analysis is made herein by damping ratio.
The virtual inertia control of the direct current voltage-frequency can be equivalent to a typical second-order transfer function, and the damping ratio ζ of the control system is:
，（9）
in the formula (9):Dis virtual damping;Xis the equivalent reactance of an alternating current circuit;U s is an ac line voltage;U 0 the method comprises the steps of storing energy for the AC side voltage of a DC/AC converter of a micro-grid for new energy;δ 0 is of voltageThe initial value of the power angle is approximately 0, if there is。
When the frequency of the power system is regulated, the damping ratio ζ is required to be in the range of [0.1-0.8 ]]In, then initial virtual inertiaH c0 The value range is as follows:
，（10）
according to equation (8), the virtual inertia adjustment coefficientk H The method meets the following conditions:
，（11）
in the formula (11):H cmax and storing the maximum virtual inertia for the super capacitor. When the novel virtual inertia control system frequency adjustment is transited to a steady state, the angular frequency deviation can be expressed as:
，（12）
in the formula (12): deltaU dc Is the voltage regulating quantity of the direct current bus.
Substituting the expression (11) into the expression (12) can obtain the virtual inertia adjustment coefficientk H The expression is:
，（13）
the proposal is that the super capacitor energy storage capacity scheme is configured according to the super capacitor energy storage voltage change range and the maximum virtual inertia, and the direct current bus adjusting range is as follows:
，（14）
in formula (14):、/>the minimum and maximum virtual frequencies are respectively obtained. The optimal configuration formula of the energy storage capacitance value of the super capacitor can be obtained according to the formula (12):
，（15）
in formula (15):、/>。
the super capacitor energy storage capacitor is configured according to the direct current bus voltage variation range and the maximum virtual inertia, and the optimal configuration of the capacitance value can be realized on the basis of meeting the virtual inertia.
When the DC/AC converter of the new energy storage micro-grid is subjected to frequency fluctuation caused by load switching, transient virtual inertia support can be provided through direct-current side super capacitor energy storage. In the frequency recovery stage, if fluctuation exists all the time, the voltage of the direct current bus cannot be recovered to an initial value, and if the load is continuously switched on/off in a low voltage/high voltage state, the new energy storage micro-grid is off-grid due to the fact that the voltage is too low/too high, and the stable operation of the power system is seriously affected. In order to enable the direct-current bus voltage to be restored rapidly in the frequency restoration stage, the invention provides a high-frequency component inertia simulation method based on a high-pass filter, and the direct-current bus voltage is kept stable by a new energy storage micro-grid on the basis of not changing the storage inertia support of a super capacitor.
Further, in one embodiment of the present invention, by introducing a high pass filter into the new energy storage micro grid, the dc bus voltage is kept stable, including:
defining a direct current inertia gain:
，（16）
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain transfer function into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
，（17）
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively.
From formula (17), it can be seen that: the high-frequency filter is introduced in inertia control, the frequency adjustment of the surface only processes the high-frequency component, the influence of the low-frequency component on the voltage adjustment of the direct-current bus can be ignored, namely, when the frequency fluctuation is caused to load switching, the virtual inertia control system with the high-pass filtering link only extracts the angular frequency of the alternating-current side power gridω g Inertia adjustment is performed. When (when)ω g And the high-pass filter is withdrawn, and the voltage of the direct current bus is restored to the initial value. The combination formula (17) and the formula (7) can obtain a virtual moment of inertia expression containing a high-pass filtering link, wherein the virtual moment of inertia expression comprises the following components:
，（18）
next, the voltage regulation characteristic is analyzed, and referring to (9), the damping ratio ζ of the DC voltage-frequency virtual inertia control system after the high-pass filter is introduced can be obtained H The method comprises the following steps:
，（19）
in formula (19):U dcH the delta is high-pass filtered for the dc bus voltage. The damping ratio of the control system can be changed by adjusting the virtual inertial high-pass gain coefficient, and the interference of frequency disturbance on the voltage of the direct current bus is effectively reduced. Damping ratio ζ of control system of (19) H Set to the optimal damping ratio, ζ H =0.707, at which time the optimal virtual inertial high-pass gainK gu The method comprises the following steps:
，（20）
virtual inertial high-pass gain maximumK gmax The maximum modulation ratio (0.5) and the frequency fluctuation range (+ -1%) of the new energy storage micro-grid DC/AC converter can be expressed as follows:
，（21）
the dc voltage-frequency virtual inertial high-pass gain can be determined according to equations (20-21). The novel virtual inertia control is adopted in the outer ring of the DC/AC converter of the new energy storage micro-grid, and the current closed-loop control is adopted in the inner ring. The given output delta of the current inner loop from the new virtual inertia control outer loopU dc The inner current loop is divided intodqThe control of the shaft current is performed,I d in response to the active power of the electric vehicle,I q corresponding to reactive power, the reactive power is not required to be considered in the direct-current micro-grid, and only the direct-current micro-grid is required to be subjected toI d And controlling. Ignoring the current inner loop dynamic response, the current inner loop control link can be expressed as:
，（22）
in formula (22):K p 、K i the current inner loop proportion and integral coefficient are respectively. The control block diagram is shown in fig. 4.
In fig. 4:is the active current reference value.
Active power currentI d Expressed under the voltage vector as:
，（23）
in formula (23):δis the voltage power angle. The simultaneous formula (6), formula (22) and formula (23) can be obtained:
，（24）
according to equation (24), the virtual inertia control transfer function is obtained as:
，（25）
substituting equation (16) into equation (25) can obtain a virtual inertia control transfer function including a high pass filter. In the frequency fluctuation recovery process, the dc bus voltage deviation response curve is shown in fig. 5.
According to the network-structured super-capacitor energy storage virtual inertia control method provided by the embodiment of the invention, the new energy storage micro-grid keeps the voltage of the direct-current bus stable on the basis of not changing the support of the super-capacitor energy storage inertia.
In order to realize the embodiment, the invention also provides a net-structured super capacitor energy storage virtual inertia control device.
Fig. 6 is a schematic structural diagram of a network super capacitor energy storage virtual inertia control device according to an embodiment of the present invention.
As shown in fig. 6, the network super capacitor energy storage virtual inertia control device includes: a build module 100, a configure module 200, a restore module 300, a control module 400, wherein,
the construction module is used for constructing a new energy storage micro-grid;
the configuration module is used for rapidly releasing/absorbing electric energy by configuring the super capacitor in the new energy storage micro-grid;
the recovery module is used for keeping the voltage of the direct current bus stable by introducing a high-pass filter into the new energy storage micro-grid;
and the control module is used for controlling the inertia of the new energy storage micro-grid through the super capacitor and the high-pass filter.
Further, in one embodiment of the present invention, the building block is further configured to:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc is the DC inertia gain.
Further, in an embodiment of the present invention, the step of maintaining the voltage of the dc bus stable by introducing a high-pass filter into the new energy storage micro-grid includes:
defining a direct current inertia gain:
，
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively.
To achieve the above object, an embodiment of the present invention provides a computer device, which is characterized by comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, wherein the method for controlling energy storage virtual inertia of a network super capacitor is implemented when the processor executes the computer program.
To achieve the above object, a fourth aspect of the present invention provides a computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the method for controlling virtual inertia of a network super capacitor energy storage as described above.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (4)
1. The method for controlling the energy storage virtual inertia of the network super capacitor is characterized by comprising the following steps of:
constructing a new energy storage micro-grid;
by configuring the super capacitor in the new energy storage micro-grid, the electric energy is quickly released/absorbed;
the high-pass filter is introduced into the new energy storage micro-grid to keep the voltage of the direct-current bus stable;
the inertia control of the new energy storage micro-grid is realized through the super capacitor and the high-pass filter;
the construction of the new energy storage micro-grid comprises the following steps:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc the gain is the direct current inertia gain;
the method for maintaining the voltage stability of the direct current bus by introducing a high-pass filter into the new energy storage micro-grid comprises the following steps:
defining a direct current inertia gain:
，
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
。
2. the utility model provides a virtual inertia controlling means of net-structured super capacitor energy storage which is characterized in that includes following module:
the construction module is used for constructing a new energy storage micro-grid;
the configuration module is used for rapidly releasing/absorbing electric energy by configuring the super capacitor in the new energy storage micro-grid;
the recovery module is used for keeping the voltage of the direct current bus stable by introducing a high-pass filter into the new energy storage micro-grid;
the control module is used for controlling inertia of the new energy storage micro-grid through the super capacitor and the high-pass filter;
the construction of the new energy storage micro-grid comprises the following steps:
the new energy storage micro-grid is constructed by adopting a direct-current voltage-frequency virtual inertia control scheme and is expressed as follows:
，
wherein ,U dc 、U dc0 respectively a current value and an initial value of the DC bus voltage;ω、ω 0 the current angular frequency and the initial angular frequency of the alternating current side power grid are respectively,K dc the gain is the direct current inertia gain;
the method for maintaining the voltage stability of the direct current bus by introducing a high-pass filter into the new energy storage micro-grid comprises the following steps:
defining a direct current inertia gain:
，
wherein ,K g is a virtual inertial high-pass gain coefficient,ω g for the high-pass filter cut-off frequency,is a Laplacian operator;
substituting the direct-current inertia gain into a direct-current voltage-frequency virtual inertia control scheme to obtain a virtual inertia control equation containing a high-pass filtering link:
。
3. a computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for controlling the virtual inertia of the network super capacitor according to claim 1 when executing the computer program.
4. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method for controlling virtual inertia of a mesh-formed supercapacitor according to claim 1.
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