CN111864800A - Converter grid-connected equipment-based multi-scale inertia control method and additional controller - Google Patents
Converter grid-connected equipment-based multi-scale inertia control method and additional controller 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses a converter grid-connected equipment-based multi-scale inertia control method and an additional controller, wherein the method comprises the following steps: dividing a control module of the converter grid-connected equipment into a direct-current voltage control scale module and an alternating-current control scale module according to the time response speed during disturbance; respectively passing the terminal voltage q-axis component under the phase-locked coordinate system through filters and signal conversion modules with different frequency bands, and outputting control signals corresponding to the control modules with different time scales; and low-frequency-band and high-frequency-band control signals are respectively added to an active branch of the direct-current voltage control scale module and a reactive branch of the alternating-current control scale module, so that different response degrees of the active/reactive branches of the converter grid-connected equipment to different time scale signals of the system are fully utilized, and inertia support is efficiently and coordinately provided for different time scales of the system. In addition, the invention does not increase the number of sensors additionally and change the active/reactive power injected into the power grid by the converter grid-connected equipment in a steady state.
Description
Technical Field
The invention belongs to the technical field of power system frequency stability control, and particularly relates to a converter grid-connected equipment-based multi-scale inertia control method and an additional controller.
Background
With the rapid and continuous development of power electronic technology, the permeability of the voltage source converter in the power system is higher and higher, and the influence of the voltage amplitude/frequency dynamic process concerned by the power system is larger and larger. In order to output constant active/reactive power, the voltage amplitude/frequency output by the converter grid-connected equipment can change rapidly along with the change of the grid voltage amplitude/frequency, so that effective inertia support is difficult to provide for the power system. In recent years, many power failure accidents occur due to insufficient power grid inertia supporting capacity, such as a blackout in south australia "9.28" and a blackout in uk "8.9". Therefore, how to improve the inertia supporting capability of the power system with the large-scale converter grid-connected equipment becomes an important problem of safe and stable operation of the power system.
Currently, a great deal of research is conducted in the academic world and the industrial world on the inertia control of converter grid-connected equipment. The most widely applied principle is the virtual synchronous machine control principle, namely, the control of the converter grid-connected equipment is designed according to the processes of synchronous generator rotor movement and the like, so that the converter grid-connected equipment has inertia supporting capacity similar to a synchronous generator, but the control and the method need to upgrade and transform the control of the whole equipment, and cannot be applied to the existing converter grid-connected equipment in a large scale. In another mode, a corresponding additional controller is designed according to the change rate of the grid frequency to improve the inertia supporting capacity of the converter grid-connected equipment. However, the research does not deeply consider the influence of the speed of the grid frequency change rate on the relationship between the active/reactive power and the amplitude/frequency of the system, so that a more efficient converter grid-connected equipment inertia control method is not provided for different speed grid frequency change rates.
Due to the existence of energy storage elements with different capacity sizes and controllers with different response times in power electronic equipment such as a converter, the dynamic process of the system caused by the energy storage elements presents the characteristic of multiple time scales. In order to ensure safe and stable operation of the power system, the power system needs to have enough inertia support at different time scales. Therefore, the method for increasing and improving the multi-time scale inertia supporting capacity of the converter grid-connected equipment has great strategic significance on the multi-time scale safe and stable operation of the power system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-scale inertia control method and an additional controller based on converter grid-connected equipment, and aims to solve the problem that the existing additional inertia control mode does not consider the influence of the speed of the frequency change rate of a power grid on the relation between the active/reactive power and the amplitude/frequency of a system, so that multi-scale inertia support cannot be efficiently and coordinately provided for a power system.
In order to achieve the purpose, the invention provides a multi-scale inertia control method based on converter grid-connected equipment, which comprises the following steps of:
(1) dividing a control module of the converter grid-connected equipment into control modules with different time scales according to the size of an energy storage element in the converter grid-connected equipment and the response speed of a controller;
(2) filtering the terminal voltage q-axis component under the phase-locked coordinate system in different frequency bands respectively to obtain different frequency band signals corresponding to the different time scale control modules;
(3) processing the signals of different frequency bands to obtain control signals corresponding to the time scale control module;
(4) the control signal corresponding to the low-frequency band is added to the active branch of the direct-current voltage control scale module, and the control signal corresponding to the high-frequency band is added to the reactive branch of the alternating-current control scale module, so that the multi-scale inertia control of the converter grid-connected equipment is realized, the converter grid-connected equipment can effectively and coordinately respond to the frequency change of a system on different time scales, and the multi-scale inertia support is provided for the system.
Further, in the step (1), according to the size of an energy storage element inside the converter grid-connected equipment and the response speed of the controller, different time scale control modules of the converter grid-connected equipment comprise a direct current voltage control scale module and an alternating current control scale module.
The response speed of the direct-current voltage control scale module is 100ms level; the response speed of the alternating current control dimension module is in the order of 10 ms. The direct-current voltage control scale corresponds to a low frequency band, and the bandwidth is ten hertz; the alternating current control scale corresponds to a high frequency band, and the bandwidth is hundred hertz.
Further, in step (2), the terminal voltage q-axis component in the phase-locked coordinate system is used to reflect the rate of change of the system frequency.
Further, in the step (2), the terminal voltage q-axis component in the phase-locked coordinate system is subjected to low-pass filtering and high-pass filtering, respectively, and a low-band signal and a high-band signal are obtained.
Furthermore, an active branch of the converter grid-connected equipment direct-current voltage control scale module is a direct-current voltage control branch; and a reactive branch of the converter grid-connected equipment AC current control scale module is a q-axis current control branch.
The invention also provides a multi-scale inertia additional controller for the converter grid-connected equipment, which comprises the following components: a filter and a signal conversion module; the filter is used for outputting a low-frequency-band frequency change rate signal corresponding to a direct-current voltage control scale and a high-frequency-band frequency change rate signal corresponding to an alternating-current control scale according to a voltage q-axis component at the lower end of the phase-locked coordinate system; the input end of the signal conversion module is connected to the output end of the filter, the output end of the signal conversion module is used for being connected to the input end of the corresponding time scale control branch, and the signal conversion module is used for converting the frequency change rate signals of different frequency bands into additional control signals corresponding to the control modules of different time scales.
Further, the signal conversion module includes: a low-frequency band signal conversion unit and a high-frequency band signal conversion unit; the low-frequency band signal conversion unit is used for converting the low-frequency band signal into a first control signal for controlling the direct-current voltage control scale module; the high-frequency band signal conversion unit is used for converting the high-frequency band signal into a second control signal for controlling the alternating current control scale module.
Preferably, the signal conversion module can be a PID controller; the PID controller comprises a proportional controller, an integral controller, a differential controller and an adder; the proportional controller can track quickly; the integral controller may eliminate steady state errors, but may increase overshoot; the differential controller can accelerate the response speed of the large inertia system and weaken the overshoot trend, and output signals with good control effect can be obtained by summing signals output by the proportional controller, the integral controller and the differential controller through the summator.
Further, the filter includes: a low pass filter and a high pass filter; the low-pass filter is used for performing low-pass filtering on the terminal voltage q-axis component under the phase-locked coordinate system and obtaining a low-frequency-band signal; the high-pass filter is used for carrying out high-pass filtering on the terminal voltage q-axis component under the phase-locked coordinate system and obtaining a high-frequency-band signal.
Preferably, the filter may be a butterworth filter. The frequency response curve in the passband of the Butterworth filter is flat to the utmost extent and has no fluctuation, and the frequency response curve gradually drops to zero in the stopband, thereby having excellent filtering performance.
The invention also provides converter grid-connected equipment which comprises the multi-scale inertia additional controller. Compared with the prior art, the converter grid-connected equipment has the advantages that due to the fact that the multi-scale inertia additional controller is added, the converter grid-connected equipment can effectively and coordinately respond to system frequency changes on different time scales, and multi-scale inertia support is provided for a system.
Preferably, the control module for different time scales of the converter grid-connected equipment comprises: the device comprises a direct-current voltage control scale module and an alternating-current control scale module; the active branch of the converter grid-connected equipment direct-current voltage control scale module is a direct-current voltage control branch; and a reactive branch of the converter grid-connected equipment AC current control scale module is a q-axis current control branch.
The low-frequency band control signal output by the low-frequency band signal conversion unit is added to a direct-current voltage control branch of the direct-current voltage control scale module, and the high-frequency band control signal output by the high-frequency band signal conversion unit is added to a q-axis current control branch of the alternating-current voltage control scale module.
The direct-current voltage control scale module is used for realizing high-efficiency response to a relatively slow (100ms level) system frequency change rate under the control of a first control signal and providing inertia support of a direct-current voltage control scale for a system; and the alternating current control scale module is used for realizing high-efficiency response to a faster (10ms level) system frequency change rate under the control of the second control signal and providing inertia support of the alternating current control scale for the system.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, by utilizing the flexible control characteristic of the multi-time scale of the converter grid-connected equipment, a low-frequency-band (about 10 Hz) signal in a frequency change rate signal is processed and then added to an active branch of a direct-current voltage control scale module of the converter grid-connected equipment, and a high-frequency-band (about 100 Hz) signal in the frequency change rate signal is processed and then added to a reactive branch of an alternating-current control scale module of the converter grid-connected equipment, so that different response degrees of the active/reactive branches of the converter grid-connected equipment to different time scale signals of a system can be fully utilized, and the multi-scale coordination and high-efficiency inertia provision of the converter grid-connected equipment can be realized through the additional control on the basis of not changing.
(2) The invention obtains the corresponding additional control signal after the terminal voltage q-axis component under the phase-locked coordinate system is processed by the filter and the signal conversion module, and the terminal voltage q-axis component is 0 in the steady state, so the control method provided by the invention can not increase the number of sensors additionally, and can not change the active/reactive power injected into the power grid by the converter grid-connected equipment in the steady state.
Drawings
Fig. 1 is a flowchart of an implementation of a converter grid-connected equipment-based multi-scale inertia control method according to an embodiment of the present invention.
Fig. 2 is a control structure of a converter grid-connected device and a time scale division block diagram thereof according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a multi-scale inertia additional controller based on converter grid-connected equipment according to an embodiment of the present invention.
Fig. 4 (a) is a schematic diagram of a low-pass filter provided in an embodiment of the present invention, and (b) is a schematic diagram of a high-pass filter provided in an embodiment of the present invention.
Fig. 5 is a schematic diagram of a PID control structure adopted by a signal conversion module in the multi-scale inertia additional controller according to the embodiment of the present invention.
Fig. 6 is a graph comparing control results of a multi-scale inertia additional controller based on converter grid-connected equipment and a conventional inertia additional controller provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a converter grid-connected equipment-based multi-scale inertia control method and an additional controller, and solves the problem that the existing additional inertia control mode does not consider the influence of the speed of the frequency change rate of a power grid on the relation between the active/reactive power and the amplitude/frequency of a system, so that additional control is not designed for different time scale control modules respectively in combination with the speed of the frequency change rate, and multi-scale inertia support cannot be efficiently and coordinately provided for a power system.
For further explanation of the converter grid-connected equipment-based multi-scale inertia control method according to the embodiment of the present invention, the following description is provided with reference to the accompanying drawings and specific examples:
as shown in fig. 1, the invention provides a converter grid-connected equipment-based multi-scale inertia control method, which includes the following steps:
(1) dividing a control module of the converter grid-connected equipment into control modules with different time scales according to the size of an energy storage element in the converter grid-connected equipment and the response speed of a controller;
(2) filtering the terminal voltage q-axis component under the phase-locked coordinate system in different frequency bands respectively to obtain different frequency band signals corresponding to the different time scale control modules;
(3) processing the signals of different frequency bands to obtain control signals corresponding to the time scale control module;
(4) the control signal corresponding to the low-frequency band is added to the active branch of the direct-current voltage control scale module, and the control signal corresponding to the high-frequency band is added to the reactive branch of the alternating-current control scale module, so that the multi-scale inertia control of the converter grid-connected equipment is realized, the converter grid-connected equipment can effectively and coordinately respond to the frequency change of a system on different time scales, and the multi-scale inertia support is provided for the system.
In the embodiment of the invention, the control module of the converter grid-connected equipment is divided according to the size of the internal energy storage element and the response speed of the controller, as shown in fig. 2, the division is briefly explained as follows in order to help understanding:
FIG. 2 shows the control structure of the converter grid-connected equipment and its time scale division block diagram, where PmInput active power for converter grid-connection equipment, eabcIs an internal potential vector, vtabcIs a terminal voltage vector, iabcFor filtering the inductor current vector, i, on the converter sidefabcAs a filter capacitor current vector, igabcIs the net side inductor current vector, vgabcIs the voltage vector of a three-phase ideal voltage source. And T1-T6 are switching tubes of each bridge arm of the converter. CdcIs a DC bus capacitor, VdcIs the DC bus capacitor voltage, L1Is a filter inductor, CfIs a filter capacitor, RcFor damping resistance, LgIs the equivalent inductance of the power grid. Variables in the phase-locked coordinate system are denoted by the superscript 'p'. Subscripts'd' and 'q' denote'd' axis and 'q' axis components in a phase-locked coordinate system, respectively; subscripts 'α' and 'β' denote 'α' axis and 'β' axis components in a stationary coordinate system, respectively; the subscript 'ref' denotes the reference value. Vectors are shown in bold italics and scalars in italics. The converter is incorporated in the grid-connected equipmentAnd energy storage elements with different carrier forms and different capacities, such as direct current bus capacitance, alternating current inductance and the like. In order to ensure that the state of each energy storage element operates in a safe and stable interval, controllers with different response speeds, such as a direct-current voltage controller (100 ms) and an alternating-current controller (10 ms), are designed in converter grid-connected equipment. When the converter grid-connected equipment is disturbed, because the energy storage capacity of the alternating current inductor is smaller than that of the direct current capacitor, after about 10ms, the state quantity (alternating current) of the alternating current inductor is changed to drive the current controller to act; when the disturbance duration is further prolonged to about 100ms, the state quantity (dc voltage) of the dc capacitor changes to drive the dc voltage controller to operate. Therefore, the time scale of the control module of the converter grid-connected equipment is divided according to the size of the internal energy storage element and the response speed of the controller, and comprises the following steps: a direct current voltage control time scale (100ms level) and an alternating current control time scale (10ms level); the control module 100 corresponding to the time scale of the direct-current voltage control mainly comprises a terminal voltage control and a direct-current voltage control; the control module 200 corresponding to the ac current control time scale mainly includes a current control unit, which is respectively shown by a dashed box and a dashed box in fig. 2. The phase-locked loop 201 is configured as shown by a two-dot chain line in fig. 2, and is used for tracking the position of the terminal voltage in real time.
Fig. 3 is a schematic structural diagram of a converter grid-connected equipment-based multi-scale inertia additional controller according to an embodiment of the present invention, including: a filter and a signal conversion module; the filter is used for outputting a low-frequency-band frequency change rate signal corresponding to a direct-current voltage control scale and a high-frequency-band frequency change rate signal corresponding to an alternating-current control scale according to a voltage q-axis component at the lower end of the phase-locked coordinate system; the input end of the signal conversion module is connected to the output end of the filter, the output end of the signal conversion module is used for being connected to the input end of the corresponding time scale control branch, and the signal conversion module is used for converting the frequency change rate signals of different frequency bands into additional control signals corresponding to the control modules of different time scales.
In an embodiment of the invention, the filter comprises: the low-pass filter is used for receiving a voltage q-axis component at the lower end of the phase-locked coordinate system, outputting a low-frequency-band frequency change rate signal corresponding to the direct-current voltage control scale, and outputting a low-frequency-band additional control signal through the low-frequency-band signal conversion unit. The high-pass filter is used for receiving a voltage q-axis component at the lower end of the phase-locked coordinate system, outputting a high-frequency-band frequency change rate signal corresponding to the alternating current control scale, and outputting a high-frequency-band additional control signal through the high-frequency-band signal conversion unit.
There are many implementations of the low-pass filter and the high-pass filter, and a common butterworth filter may be selected in this embodiment, as shown in fig. 4, a frequency response curve in a pass band of the butterworth filter is flat to the maximum extent without fluctuation, and gradually drops to zero in a stop band, and is mainly used for obtaining low-frequency band and high-frequency band signal components in the frequency variation rate signal. The butterworth low-pass filter and the high-pass filter can be represented by the transfer functions in fig. 4, the frequency response curve of the low-pass filter is maximally flat in the pass band below the cut-off frequency, and the stop band above the cut-off frequency gradually drops to zero; the frequency response curve of the high-pass filter is maximally flat in the pass band above the cut-off frequency, while the stop band below the cut-off frequency gradually drops to zero.
In the embodiment of the invention, the signal conversion module comprises a low-frequency band signal conversion unit and a high-frequency band signal conversion unit, wherein the low-frequency band signal conversion unit is used for converting a low-frequency band signal into a first control signal for controlling the direct-current voltage control scale module; the high-frequency band signal conversion unit is used for converting the high-frequency band signal into a second control signal for controlling the alternating current control scale module.
The low-band signal conversion unit and the high-band signal conversion unit are implemented in the same manner, and there are various control schemes that can be selected, and a common PID controller is selected as an example in this embodiment for description, as shown in fig. 5. The frequency change rate information of different frequency bands is output through a PID controller, and the PID controller comprises a proportional controller, an integral controller, a differential controller and an adder; the proportional controller can track quickly; the integral controller may eliminate steady state errors, but may increase overshoot; the differential controller can accelerate the response speed of the large inertia system and weaken the overshoot trend, and signals output by the proportional controller, the integral controller and the differential controller are added through the adder to obtain an output signal.
The theoretical reasons that the active branch of the direct current voltage control scale module is controlled by the low-frequency band (about 10 Hz) component in the frequency change rate signal and the reactive branch of the alternating current control scale module is controlled by the high-frequency band (about 100 Hz) component in the frequency change rate signal are as follows:
the three-phase inductive excitation-response relationship is as follows:
wherein eαβAnd iαβRespectively, the voltage excitation on the inductor and the current response flowing through the inductor under a static coordinate system, L is an inductance value,
for the current response through the inductor in a synchronous rotating coordinate system, E is the amplitude of the voltage excitation, thetaeBeing phase of voltage excitation, omegaeIs the frequency of the voltage excitation.
After differentiating and collating (1), the following expression can be obtained:
after linearizing and finishing (2), the following expression can be obtained:
where the prefix Δ represents a small deviation, s is a differential operator, E0And ω0The amplitude and frequency of the voltage excitation at steady state,
and
the current response flowing through the inductor under the synchronous rotating coordinate system in a steady state.
From the expressions (2) and (3), it can be seen that in the steady state, only reactive current and no active current exist on the inductor, and in the dynamic process, both active and reactive current exist on the inductor. In addition, the influence law of the amplitude/frequency change rate of different speeds on the active/reactive current on the inductor is different. Ls Δ E and Ls Δ ω when the amplitude and frequency change rate is sloweMuch less than omega0L.DELTA.E and ω0LΔωeThis means that a change in amplitude more easily affects the reactive current on the inductor, whereas a change in frequency more easily affects the active current on the inductor. Ls Δ E and Ls Δ ω when the rate of change of amplitude and frequency is fasteMuch larger than omega0L.DELTA.E and ω0LΔωeThis means that a change in amplitude more easily affects the active current on the inductor, whereas a change in frequency more easily affects the reactive current on the inductor.
This means that the dc voltage control scale active branch in the converter grid-tie equipment responds more easily to the slower component in the rate of change of frequency, while the ac current control time scale reactive branch responds more easily to the faster component in the rate of change of frequency. Therefore, the invention can fully utilize the different response degrees of the active/reactive branch of the converter grid-connected equipment to different time scale signals of the system, and realize the multi-scale coordination and high-efficiency inertia provision of the converter grid-connected equipment by the additional control on the basis of not changing the control of the actual converter.
Fig. 6 is a graph comparing control results of a multi-scale inertia additional controller provided by an embodiment of the present invention and an existing inertia additional controller. The simulation scene is that a single converter grid-connected equipment is connected into an infinite system, and the system is connected into an additional load in 3 s. Under the same disturbance, when a multi-scale inertia additional controller is arranged, the system frequency is smaller in fluctuation amplitude and slower in fluctuation speed in a short time scale and a long time scale, and the system inertia is obviously higher than that of the existing additional inertia control in the short time scale and the long time scale.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A multi-scale inertia control method based on converter grid-connected equipment is characterized by comprising the following steps:
(1) dividing a control module of the converter grid-connected equipment into control modules with different time scales according to the size of an energy storage element in the converter grid-connected equipment and the response speed of a controller;
(2) filtering the terminal voltage q-axis component under the phase-locked coordinate system in different frequency bands respectively to obtain different frequency band signals corresponding to the different time scale control modules;
(3) processing the signals of different frequency bands to obtain control signals corresponding to the time scale control module;
(4) the control signal corresponding to the low-frequency band is added to the active branch of the direct-current voltage control scale module, and the control signal corresponding to the high-frequency band is added to the reactive branch of the alternating-current control scale module, so that the multi-scale inertia control of the converter grid-connected equipment is realized, the converter grid-connected equipment can effectively and coordinately respond to the frequency change of a system on different time scales, and the multi-scale inertia support is provided for the system.
2. The multi-scale inertia control method according to claim 1, wherein in the step (1), a control module of the converter grid-connected equipment is divided into a direct-current voltage control scale module and an alternating-current voltage control scale module; the response speed of the direct current voltage control scale is 100ms level, and the response speed of the alternating current control scale is 10ms level.
3. The multi-scale inertia control method of claim 1 or 2, wherein in the step (2), the terminal voltage q-axis component in the phase-locked coordinate system is used to reflect a rate of change of a system frequency.
4. The multi-scale inertia control method according to any one of claims 1 to 3, wherein in the step (2), the terminal voltage q-axis component in the phase-locked coordinate system is low-pass filtered and high-pass filtered, respectively, and a low-band signal and a high-band signal are obtained.
5. The multi-scale inertia control method according to any one of claims 1 to 4, wherein an active branch of the converter grid-connected equipment DC voltage control scale module is a DC voltage control branch; and a reactive branch of the alternating current control scale module of the converter grid-connected equipment is a q-axis current control branch.
6. A multi-scale inertia additive controller for converter grid-tied equipment, comprising: a filter and a signal conversion module;
the filter is used for outputting a low-frequency-band frequency change rate signal corresponding to a direct-current voltage control scale and a high-frequency-band frequency change rate signal corresponding to an alternating-current control scale according to a voltage q-axis component at the lower end of the phase-locked coordinate system;
the input end of the signal conversion module is connected to the output end of the filter, the output end of the signal conversion module is used for being connected to the input end of the corresponding time scale control branch, and the signal conversion module is used for converting the frequency change rate signals of different frequency bands into additional control signals corresponding to the control modules of different time scales.
7. The multi-scale inertia additive controller of claim 6, wherein the signal conversion module comprises: a low-frequency band signal conversion unit and a high-frequency band signal conversion unit;
the low-frequency band signal conversion unit is used for converting the low-frequency band signal into a first control signal for controlling the direct-current voltage control scale module;
the high-frequency band signal conversion unit is used for converting the high-frequency band signal into a second control signal for controlling the alternating current control scale module.
8. The multi-scale inertia additive controller of claim 6 or 7, wherein the filter comprises: a low pass filter and a high pass filter;
the low-pass filter is used for performing low-pass filtering on the terminal voltage q-axis component under the phase-locked coordinate system and obtaining a low-frequency-band signal;
the high-pass filter is used for carrying out high-pass filtering on the terminal voltage q-axis component under the phase-locked coordinate system and obtaining a high-frequency-band signal.
9. A converter grid-tie installation comprising a multi-scale inertia additional controller according to any of claims 6 to 8.
10. The converter grid tie apparatus of claim 9, further comprising: the device comprises a direct-current voltage control scale module and an alternating-current control scale module;
the direct-current voltage control scale module is used for realizing high-efficiency response to a slower system frequency change rate under the control of a first control signal and providing inertia support of a direct-current voltage control scale for the system;
the alternating current control scale module is used for realizing high-efficiency response to a faster system frequency change rate under the control of a second control signal and providing inertia support of the alternating current control scale for the system.
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