CN218586894U - Frequency modulation system based on concentrated rectifying device - Google Patents
Frequency modulation system based on concentrated rectifying device Download PDFInfo
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- CN218586894U CN218586894U CN202222361592.2U CN202222361592U CN218586894U CN 218586894 U CN218586894 U CN 218586894U CN 202222361592 U CN202222361592 U CN 202222361592U CN 218586894 U CN218586894 U CN 218586894U
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Abstract
The utility model relates to a frequency modulation system based on concentrate fairing, wherein, frequency modulation system includes: the system comprises a generator, a generator main transformer, a split winding step-down transformer for a high-voltage plant, a centralized rectifying device and a direct-current controllable load device; the generator is connected with a power grid system through the generator main transformer; the high-voltage side of the high-voltage plant split winding step-down transformer is connected to an outlet of the generator, and the low-voltage side of the high-voltage plant split winding step-down transformer is connected to the concentrated rectifying device; the centralized rectifying device is connected with the direct current controllable load device. The utility model provides a technical scheme utilizes and concentrates fairing and carries out unified regulation to the load of high pressure mill with the controllable load unit of direct current, and then has improved frequency modulation's security, and the frequency modulation method is fairly simple simultaneously.
Description
Technical Field
The utility model relates to a frequency modulation technical field, concretely relates to frequency modulation system based on concentrate fairing.
Background
With the increase of the grid-connected quantity of wind power and energy storage, the rapid development of interconnected large power grids, large-capacity power generation and long-distance power transmission, the frequency modulation task of a power system is heavier. At present, the frequency regulation mode of an electric power system mainly comprises the steps of regulating the capacity of a generator set, cutting off a user load, balancing the power difference between a power generation side and a load side, and realizing the stable control of the system frequency.
Or an alternating current controllable load is added on the side of the power system participating in frequency modulation, but the problem of reactive compensation needs to be considered for the alternating current controllable load, and meanwhile, the fault range can be expanded when a fault occurs, so that the existing frequency modulation is more complicated and the safety is not high.
Disclosure of Invention
The utility model provides a frequency modulation system based on concentrate fairing to solve the slow technical problem that reaches the regulation inaccuracy of frequency control among the correlation technique at least.
The embodiment of the utility model provides a frequency modulation system based on concentrate fairing, include: the device comprises a generator, a generator main transformer, a split winding step-down transformer for a high-voltage plant, a centralized rectifying device and a direct-current controllable load device;
the generator is connected with a power grid system through the generator main transformer;
the high-voltage side of the high-voltage plant split winding step-down transformer is connected to an outlet of the generator, and the low-voltage side of the high-voltage plant split winding step-down transformer is connected to the concentrated rectifying device;
the centralized rectifying device is connected with the direct current controllable load device.
Preferably, the frequency modulation system further comprises: the system comprises a first plant controllable load grid-connected switch and a second plant controllable load grid-connected switch;
the concentrated rectifying device includes: a first concentrated rectifying device and a second concentrated rectifying device;
the first centralized rectifying device is connected with a low-voltage side A winding of the high-voltage plant split winding step-down transformer through the first plant controllable load grid-connected switch;
and the second centralized rectifying device is connected with a low-voltage side B winding of the high-voltage plant split winding step-down transformer through the second plant controllable load grid-connected switch.
Further, the dc controllable load device includes: a first direct current controllable load device and a second direct current controllable load device;
the first direct current controllable load device is connected with the first centralized rectifying device;
and the second direct current controllable load device is connected with the second centralized rectifying device.
Further, the first dc controllable load device includes: the system comprises a first 8.5KV direct-current bus, a direct-current controllable load first device, a direct-current controllable load second device, a direct-current controllable load third device, a first high-voltage motor inversion driving device, a first high-voltage load inversion power supply device and a first low-power load DC-DC step-down isolating device;
the first direct-current controllable load device is connected with the first 8.5KV direct-current bus through the first high-voltage motor inversion driving device;
the direct-current controllable load second device is connected with the first 8.5KV direct-current bus through the first high-voltage load inversion power supply device;
the direct-current controllable load three devices are connected with the first 8.5KV direct-current bus through the first low-power load DC-DC step-down isolation device.
Further, the second dc controllable load device includes: the second 8.5KV direct-current bus, the direct-current controllable load four device, the direct-current controllable load five device, the direct-current controllable load six device, the second high-voltage motor inversion driving device, the second high-voltage load inversion power supply device and the second low-power load DC-DC voltage reduction isolation device;
the direct-current controllable load four device is connected with the second 8.5KV direct-current bus through the second high-voltage motor inverter driving device;
the direct-current controllable load five device is connected with the second 8.5KV direct-current bus through the second high-voltage load inversion power supply device;
the six direct-current controllable load devices are connected with the second 8.5KV direct-current bus through the second low-power load DC-DC step-down isolation device.
Further, the dc controllable load device includes: the first high-voltage motor is connected with the first high-voltage motor inversion driving device through the first high-voltage motor grid-connected switch;
the direct current controllable load two device comprises: the first high-voltage load is connected with the first high-voltage load inversion power supply device through the first high-voltage load grid-connected switch.
Further, the three dc controllable load devices include: the system comprises a first circuit breaker, a first low-power load low-voltage direct-current bus, a first 1-section low-power load inversion power supply device, a first 1-section low-power load, a first 2-section low-power load inversion power supply device and a first 2-section low-power load;
one end of the first breaker is connected with the first low-power load low-voltage direct-current bus bar, and the other end of the first breaker is connected with the first low-power load DC-DC step-down isolation device;
the first 1 section of low-power load is connected with the first low-power load low-voltage direct-current bus bar through the first 1 section of low-power load inversion power supply device;
the first 2 sections of low-power loads are connected with the first low-power load low-voltage direct-current bus bar through the first 2 sections of low-power load inversion power supply devices.
Further, the dc controllable load four device includes: the second high-voltage motor is connected with the second high-voltage motor inversion driving device through the second high-voltage motor grid-connected switch;
the five direct-current controllable load devices comprise: the second high-voltage load is connected with the second high-voltage load inversion power supply device through the second high-voltage load grid-connected switch.
Further, the six direct-current controllable load devices include: the system comprises a second circuit breaker, a second low-power load low-voltage direct-current bus, a second 1-section low-power load inversion power supply device, a second 1-section low-power load, a second 2-section low-power load inversion power supply device and a second 2-section low-power load;
one end of the second breaker is connected with the second low-power load low-voltage direct-current bus bar, and the other end of the second breaker is connected with the second low-power load DC-DC step-down isolation device;
the second 1 section of low-power load is connected with the second low-power load low-voltage direct-current bus bar through the second 1 section of low-power load inversion power supply device;
and the second 2 sections of low-power loads are connected with the second low-power load low-voltage direct-current bus bar through the second 2 sections of low-power load inversion power supply devices.
Further, the number of the first 1-segment low-power loads, the number of the first 2-segment low-power loads, the number of the second 1-segment low-power loads, and the number of the second 2-segment low-power loads are all N, where N is an integer greater than or equal to 1.
The embodiment of the utility model provides a technical scheme brings following beneficial effect at least:
the utility model provides a pair of frequency modulation system based on concentrate fairing, wherein, the system includes: the device comprises a generator, a generator main transformer, a split winding step-down transformer for a high-voltage plant, a centralized rectifying device and a direct-current controllable load device; the generator is connected with a power grid system through the generator main transformer; the high-voltage side of the high-voltage plant split winding step-down transformer is connected to an outlet of the generator, and the low-voltage side of the high-voltage plant split winding step-down transformer is connected to the concentrated rectifying device; the centralized rectifying device is connected with the direct current controllable load device. The utility model provides a technical scheme can utilize concentrated fairing to carry out unified regulation to the load of high pressure factory with the controllable load unit of direct current, and then has improved frequency modulation's security, and the frequency modulation method is fairly simple simultaneously.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a first structural diagram of a frequency modulation system based on a concentrated rectifying device according to an embodiment of the present invention;
fig. 2 is a second structural diagram of a frequency modulation system based on a concentrated rectifying device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dc controllable load device provided according to an embodiment of the present invention;
fig. 4 is a detailed structural diagram of a frequency modulation system based on a concentrated rectifying device according to an embodiment of the present invention;
reference numerals are as follows:
the system comprises a generator 1, a generator main transformer 2, a split winding step-down transformer 3 for a high-voltage plant, a centralized rectifying device 4, a direct-current controllable load device 5, a first plant controllable load grid-connected switch 6, a second plant controllable load grid-connected switch 7, a first centralized rectifying device 4-1, a second centralized rectifying device 4-2, a first direct-current controllable load device 5-1, a second direct-current controllable load device 5-2, a first 8.5KV direct-current bus 5-1-1, a direct-current controllable load device 5-1-2, a direct-current controllable load device 5-1-3, a direct-current controllable load device 5-1-4, a first high-voltage motor inversion driving device 5-1-5, a second high-voltage motor inversion driving device 5 5-1-6 parts of a first high-voltage load inversion power supply device, 5-1-7 parts of a first low-power load DC-DC step-down isolation device, 5-1-2-1 parts of a first high-voltage motor, 5-1-2-2 parts of a first high-voltage motor grid-connected switch, 5-1-3-1 parts of a first high-voltage load grid-connected switch, 5-1-3-2 parts of a first circuit breaker, 5-1-4-1 parts of a first low-power load low-voltage direct-current bus bar, 5-1-4-3 parts of a first 1-section low-power load inversion power supply device, 5-1-4-4 parts of a first 1-section low-power load inversion power supply device, 5-1-4-5 parts of a first 2-section low-power load inversion power supply device, 5-1-4-6 parts of a first 2-section low-power load inversion power supply device, the system comprises a second 8.5KV direct-current bus 5-2-1, a direct-current controllable load four device 5-2-2, a direct-current controllable load five device 5-2-3, a direct-current controllable load six device 5-2-4, a second high-voltage motor inversion driving device 5-2-5, a second high-voltage load inversion power supply device 5-2-6, a second small-power load DC-DC voltage reduction isolating device 5-2-7, a second high-voltage motor 5-2-1, a second high-voltage motor grid-connected switch 5-2-2-2, a second high-voltage load 5-2-3-1, a second high-voltage load grid-connected switch 5-2-3-2, a second circuit breaker 5-2-4-1, a second small-power load low-voltage direct-current bus 5-2-4-2, a second 1 small-power load inversion power supply device 5-2-4-3, a second 1-section small-power load 5-2-4-4, a second 2-section small-power load inversion power supply device 5-2-4 and a second 2-4-6.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The utility model provides a frequency modulation system based on concentrate fairing, wherein, the system includes: the system comprises a generator, a generator main transformer, a split winding step-down transformer for a high-voltage plant, a centralized rectifying device and a direct-current controllable load device; the generator main transformer is connected with a power grid system through the generator main transformer; the high-voltage side of the voltage reduction transformer of the split winding for the high-voltage plant is connected to the outlet of the generator, and the low-voltage side of the voltage reduction transformer of the split winding for the high-voltage plant is connected to the centralized rectifying device; the centralized rectifying device is connected with the direct current controllable load device. The utility model provides a technical scheme can utilize concentrated fairing to carry out unified regulation to the load of high pressure factory with the controllable load unit of direct current, and then has improved frequency modulation's security, and the frequency modulation method is fairly simple simultaneously.
The following describes a frequency modulation system based on a concentrated rectifying device according to an embodiment of the present invention with reference to the drawings.
Example 1
Fig. 1 is a structural diagram of a frequency modulation system based on a centralized rectifying device according to an embodiment of the present disclosure, as shown in fig. 1, including: the generator comprises a generator 1, a generator main transformer 2, a split winding step-down transformer 3 for a high-voltage plant, a centralized rectifying device 4 and a direct current controllable load device 5;
the generator 1 is connected with a power grid system through the generator main transformer 2;
the high-voltage side of the high-voltage plant split winding step-down transformer 3 is connected to an outlet of the generator 1, and the low-voltage side of the high-voltage plant split winding step-down transformer 3 is connected to the centralized rectifying device 4;
the centralized rectifying device 4 is connected with the direct current controllable load device 5.
In this disclosure, as shown in fig. 2, the frequency modulation system further includes: a first factory controllable load grid-connected switch 6 and a second factory controllable load grid-connected switch 7;
the concentrated rectifying device 4 includes: a first concentrated rectifying device 4-1 and a second concentrated rectifying device 4-2;
the first centralized rectifying device 4-1 is connected with a low-voltage side A winding of the high-voltage plant split winding step-down transformer 3 through the first plant controllable load grid-connected switch 6;
and the second centralized rectifying device 4-2 is connected with the low-voltage side B winding of the high-voltage plant split winding step-down transformer 3 through the second plant controllable load grid-connected switch 7.
Further, as shown in fig. 2, the dc controllable load device 5 includes: a first direct current controllable load device 5-1 and a second direct current controllable load device 5-2;
the first direct current controllable load device 5-1 is connected with the first centralized rectifying device 4-1;
the second direct current controllable load device 5-2 is connected with the second centralized rectifying device 4-2.
As shown in fig. 3, the first dc controllable load device 5-1 includes: the system comprises a first 8.5KV direct-current bus 5-1-1, a first direct-current controllable load device 5-1-2, a second direct-current controllable load device 5-1-3, a third direct-current controllable load device 5-1-4, a first high-voltage motor inversion driving device 5-1-5, a first high-voltage load inversion power supply device 5-1-6 and a first low-power load DC-DC voltage reduction isolation device 5-1-7;
the direct current controllable load device 5-1-2 is connected with the first 8.5KV direct current bus 5-1-1 through the first high-voltage motor inverter driving device 5-1-5;
the direct current controllable load second device 5-1-3 is connected with the first 8.5KV direct current bus 5-1-1 through the first high-voltage load inversion power supply device 5-1-6;
the direct current controllable load three devices 5-1-4 are connected with the first 8.5KV direct current bus 5-1-1 through the first low-power load DC-DC step-down isolation devices 5-1-7.
Wherein the dc controllable load is a device 5-1-2, comprising: the system comprises a first high-voltage motor 5-1-2-1 and a first high-voltage motor grid-connected switch 5-1-2-2, wherein the first high-voltage motor 5-1-2-1 is connected with a first high-voltage motor inversion driving device 5-1-5 through the first high-voltage motor grid-connected switch 5-1-2-2;
the direct current controllable load secondary device 5-1-3 comprises: the system comprises a first high-voltage load 5-1-3-1 and a first high-voltage load grid-connected switch 5-1-3-2, wherein the first high-voltage load 5-1-3-1 is connected with a first high-voltage load inversion power supply device 5-1-6 through the first high-voltage load grid-connected switch 5-1-3-2;
the three direct current controllable load devices 5-1-4 comprise: the system comprises a first circuit breaker 5-1-4-1, a first low-power load low-voltage direct-current bus bar 5-1-4-2, a first 1-section low-power load inversion power supply device 5-1-4-3, a first 1-section low-power load 5-1-4-4, a first 2-section low-power load inversion power supply device 5-1-4-5 and a first 2-section low-power load 5-1-4-6;
one end of the first breaker 5-1-4-1 is connected with the first low-power load low-voltage direct-current bus bar 5-1-4-2, and the other end of the first breaker is connected with the first low-power load DC-DC step-down isolating device 5-1-7;
the first section of low-power load 5-1-4-4 is connected with the first section of low-power load low-voltage direct-current bus bar 5-1-4-2 through the first section of low-power load inversion power supply device 5-1-4-3;
the first 2 sections of low-power loads 5-1-4-6 are connected with the first low-power load low-voltage direct-current bus bar 5-1-4-2 through the first 2 sections of low-power load inversion power supply devices 5-1-4-5.
As shown in fig. 3, the second dc controllable load device 5-2 includes: the system comprises a second 8.5KV direct current bus 5-2-1, a direct current controllable load four device 5-2-2, a direct current controllable load five device 5-2-3, a direct current controllable load six device 5-2-4, a second high-voltage motor inversion driving device 5-2-5, a second high-voltage load inversion power supply device 5-2-6 and a second low-power load DC-DC voltage reduction isolating device 5-2-7;
the direct-current controllable load four device 5-2-2 is connected with the second 8.5KV direct-current bus 5-2-1 through the second high-voltage motor inversion driving device 5-2-5;
the direct-current controllable load five device 5-2-3 is connected with the second 8.5KV direct-current bus 5-2-1 through the second high-voltage load inversion power supply device 5-2-6;
the direct current controllable load six device 5-2-4 is connected with the second 8.5KV direct current bus 5-2-1 through the second low-power load DC-DC step-down isolation device 5-2-7.
The direct current controllable load four device 5-2-2 comprises: the second high-voltage motor 5-2-2-1 and the second high-voltage motor grid-connected switch 5-2-2-2 are connected with the second high-voltage motor inversion driving device 5-2-5 through the second high-voltage motor grid-connected switch 5-2-2-1;
the five direct-current controllable load devices 5-2-3 comprise: the second high-voltage load 5-2-3-1 and the second high-voltage load grid-connected switch 5-2-3-2 are connected with the second high-voltage load inversion power supply device 5-2-6 through the second high-voltage load grid-connected switch 5-2-3-2;
the six direct-current controllable load devices 5-2-4 comprise: the power supply system comprises a second circuit breaker 5-2-4-1, a second low-power load low-voltage direct-current bus bar 5-2-4-2, a second 1-section low-power load inversion power supply device 5-2-4-3, a second 1-section low-power load inversion power supply device 5-2-4-4, a second 2-section low-power load inversion power supply device 5-2-4-5 and a second 2-section low-power load 5-2-4-6;
one end of the second breaker 5-2-4-1 is connected with the second low-power load low-voltage direct-current bus bar 5-2-4-2, and the other end of the second breaker is connected with the second low-power load DC-DC step-down isolating device 5-2-7;
the second section of low-power load 5-2-4-4 is connected with the second section of low-power load low-voltage direct-current bus bar 5-2-4-2 through the second section of low-power load inversion power supply device 5-2-4-3;
the second 2 sections of low-power loads 5-2-4-6 are connected with the second low-power load low-voltage direct-current bus bar 5-2-4-2 through the second 2 sections of low-power load inversion power supply devices 5-2-4-5.
In this embodiment of the present disclosure, the number of the first 1-segment low-power loads, the number of the first 2-segment low-power loads, the number of the second 1-segment low-power loads, and the number of the second 2-segment low-power loads are all N, where N is an integer greater than or equal to 1.
For example, the first high-voltage motor 5-1-2-1, the first high-voltage load 5-1-3-1, the first 1-stage low-power load 5-1-4-4, the first 2-stage low-power load 5-1-4-6, the second high-voltage motor 5-2-1, the second high-voltage load 5-2-3-1, the second 1-stage low-power load 5-2-4-4, and the second 2-stage low-power load 5-2-4-6 may be adjusted by the first centralized rectifying device 4-1 or/and the second centralized rectifying device 4-2 based on the corresponding controllable load power adjustment amount required to be adjusted by the frequency modulation command.
When the power to be regulated is large, the first centralized rectifying device 4-1 and the second centralized rectifying device 4-2 are used for regulating the power consumption in the high-voltage plant-use direct-current controllable load unit 2 at the same time, and when the power to be regulated is small, the first centralized rectifying device 4-1 or the second centralized rectifying device 4-2 is used for regulating the load in the high-voltage plant-use direct-current controllable load unit 2, wherein the load in the high-voltage plant-use direct-current controllable load unit 2 comprises: the adjustable load control system comprises a first high-voltage motor 5-1-2-1, a first high-voltage load 5-1-3-1, a first 1-section low-power load 5-1-4-4, a first 2-section low-power load 5-1-4-6, a second high-voltage motor 5-2-1, a second high-voltage load 5-2-3-1, a second 1-section low-power load 5-2-4-4 and a second 2-section low-power load 5-2-4-6, so that the adjustable load range is larger, and the adjustment is more accurate.
Furthermore, the number of the 1 section of low-power load inversion power supply device and the 1 section of low-power load can be multiple, and the 1 section of low-power load corresponds to one 1 section of low-power load inversion power supply device; the number of the 2 sections of low-power load inversion power supply devices and the number of the 2 sections of low-power loads can be multiple, and the 2 sections of low-power loads correspond to one 2 sections of low-power load inversion power supply devices.
It should be noted that, the first centralized rectifying device 4-1 and the second centralized rectifying device 4-2 both use (modular multilevel converter, MMC) full-control power devices of power electronics, so that active power and reactive power can be independently adjusted, a single device can be omitted by using the centralized rectifying device 1-1 to configure a single current conversion device, centralized rectification is performed, the electric energy conversion efficiency is improved, and load loss is reduced, meanwhile, the centralized rectifying device uses the full-control power devices, the maximum short-circuit current is 1.5 times of rated current, the requirement on dynamic and thermal stability of the circuit breaker is not high, the protection is simple, and the fault range cannot be expanded.
In the embodiment of the disclosure, the power consumption of the load in the high-voltage plant direct-current controllable load unit 2 can be flexibly regulated and controlled by controlling the centralized rectifying device 4, so that the power consumption of the load in the high-voltage plant direct-current controllable load unit 2 is used as a flexible and controllable load to participate in the thermal power frequency modulation working condition, the requirement of the current power grid on the controllable load frequency modulation is met, compared with the frequency modulation of an additional device auxiliary thermal power unit, the change amount of a plant power system is smaller, and the utilization rate of the original plant system is high.
It should be noted that, the first 8.5KV dc bus 5-1-1 and the second 8.5KV dc bus 5-2-1 are adopted in the high voltage plant dc controllable load unit 2, which improves the voltage level compared with the traditional 6KV dc bus voltage, and only needs the positive and negative cables, which greatly reduces the cable amount and saves the investment compared with the 6KV three-phase ac cable. Simultaneously, fault location is simple on the 8.5kV direct current bus, and because all adopt power electronic equipment, and relative cost is cheap, can simplify the power consumption load internal circuit and reduce fault rate and equipment cost, and further, high voltage plant uses direct current controllable load unit 2 and compares in traditional thermal power 6kV high voltage plant system, adopts direct current power supply, distribution form, and the unit does not have the harmonic to manage the problem, and the power supply is stable, the electric energy quality is high, need not to consider phase angle and frequency in the high voltage plant uses direct current controllable load unit 2, can realize asynchronous system interconnection, does not have reactive compensation problem.
Furthermore, the power supply capacity of the high-voltage factory direct-current controllable load unit 2 is further improved compared with that of an original factory system, more subsequent loads can be conveniently accessed, direct-current networking is relatively simple, the loads have the characteristic of power electronic modularization, the access is simple, complex verification is not needed, the power supply range is wider, meanwhile, various motors, high-voltage loads and low-voltage loads in the high-voltage factory direct-current controllable load unit 2 are relatively simple in configuration protection, when a fault occurs, the fault range cannot be expanded due to isolation of a frequency conversion device, and power electronic full-control components are adopted, so that the high-voltage factory direct-current controllable load unit has the functions of alternating current and direct current isolation and voltage change besides the function of converting; and all components are power electronic, so that the power supply is efficient, and meanwhile, the problem of harmonic wave and voltage fluctuation impact influence is avoided because the direct current mode is adopted for power supply.
In the embodiment of the present disclosure, as shown in fig. 4, for an overall schematic diagram of the frequency modulation system based on the centralized rectification device, when the frequency modulation instruction is received, the active power to be adjusted is determined, based on the active power to be adjusted, the first centralized rectification device 4-1 and/or the second centralized rectification device 4-2 are used to control the magnitude of the power consumption of each load in the high-voltage plant dc controllable load unit 2, and based on the active power to be adjusted, the high-voltage plant dc controllable load unit 2 is driven by the various motors, the high-voltage power consumption and the low-voltage power consumption in a variable frequency manner, and the frequency modulation instruction is responded by the first high-voltage motor inverter driving device 5-1-5, the first high-voltage load inverter power supply device 5-1-6, the first 1-section low-power load inverter power supply device 5-1-4-3, the first 2-section low-power load inverter power supply device 5-1-4-5, the second high-voltage motor inverter driving device 5-2-5, the second high-2-6, the second 1-section low-power load inverter power supply device 5-2-4-3, and the second high-2-5, and the frequency modulation instruction is responded, i.e.
When the frequency of a power transmission line connected with a thermal power generating unit, namely a generator, is reduced, the active power of the load of the thermal power generating unit is linearly reduced in a direct proportion manner to inhibit the reduction of the frequency; when the frequency of a power transmission line connected with the thermal power generating unit rises, the active power of the load of the thermal power generating unit is linearly increased in proportion to inhibit the increase of the frequency.
Furthermore, the frequency change of the unit is responded in real time by controlling the dynamic adjustment of the power load in the high-voltage plant direct-current controllable load unit 2.
In summary, according to the frequency modulation system based on the centralized rectifying device provided in this embodiment, the centralized rectifying device can be used to uniformly adjust the load of the high-voltage plant dc controllable load unit, so that the safety of frequency modulation is improved, and meanwhile, the frequency modulation method is relatively simple.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like 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, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A frequency modulation system based on a concentrated rectifying device is characterized by comprising: the device comprises a generator, a generator main transformer, a split winding step-down transformer for a high-voltage plant, a centralized rectifying device and a direct-current controllable load device;
the generator is connected with a power grid system through the generator main transformer;
the high-voltage side of the high-voltage plant split winding step-down transformer is connected to an outlet of the generator, and the low-voltage side of the high-voltage plant split winding step-down transformer is connected to the concentrated rectifying device;
the centralized rectifying device is connected with the direct current controllable load device.
2. A frequency modulation system as claimed in claim 1, wherein the frequency modulation system further comprises: the system comprises a first plant controllable load grid-connected switch and a second plant controllable load grid-connected switch;
the concentrated rectifying device includes: a first centralized rectifying device and a second centralized rectifying device;
the first centralized rectifying device is connected with a low-voltage side A winding of the high-voltage plant split winding step-down transformer through the first plant controllable load grid-connected switch;
and the second centralized rectifying device is connected with a low-voltage side B winding of the high-voltage plant split winding step-down transformer through the second plant controllable load grid-connected switch.
3. A frequency modulation system as claimed in claim 2, wherein the dc controllable load means comprises: a first direct current controllable load device and a second direct current controllable load device;
the first direct current controllable load device is connected with the first centralized rectifying device;
the second direct current controllable load device is connected with the second centralized rectifying device.
4. A frequency modulation system as claimed in claim 3, wherein the first dc controllable loading means comprises: the system comprises a first 8.5KV direct-current bus, a direct-current controllable load first device, a direct-current controllable load second device, a direct-current controllable load third device, a first high-voltage motor inversion driving device, a first high-voltage load inversion power supply device and a first low-power load DC-DC step-down isolating device;
the first direct-current controllable load device is connected with the first 8.5KV direct-current bus through the first high-voltage motor inversion driving device;
the direct-current controllable load second device is connected with the first 8.5KV direct-current bus through the first high-voltage load inversion power supply device;
the direct-current controllable load three devices are connected with the first 8.5KV direct-current bus through the first low-power load DC-DC voltage reduction isolation device.
5. A frequency modulation system as claimed in claim 4, wherein the second DC controllable load means comprises: the second 8.5KV direct-current bus, the direct-current controllable load four device, the direct-current controllable load five device, the direct-current controllable load six device, the second high-voltage motor inversion driving device, the second high-voltage load inversion power supply device and the second low-power load DC-DC voltage reduction isolation device;
the direct-current controllable load four device is connected with the second 8.5KV direct-current bus through the second high-voltage motor inversion driving device;
the direct-current controllable load five device is connected with the second 8.5KV direct-current bus through the second high-voltage load inversion power supply device;
the six direct-current controllable load devices are connected with the second 8.5KV direct-current bus through the second low-power load DC-DC step-down isolation device.
6. A FM system as claimed in claim 4, wherein said DC controllable load comprises: the first high-voltage motor is connected with the first high-voltage motor inversion driving device through the first high-voltage motor grid-connected switch;
the direct current controllable load two device comprises: the first high-voltage load is connected with the first high-voltage load inversion power supply device through the first high-voltage load grid-connected switch.
7. A FM system as claimed in claim 6, wherein said DC controllable load is a three-device comprising: the system comprises a first circuit breaker, a first low-power load low-voltage direct-current bus, a first 1-section low-power load inversion power supply device, a first 1-section low-power load, a first 2-section low-power load inversion power supply device and a first 2-section low-power load;
one end of the first breaker is connected with the first low-power load low-voltage direct-current bus bar, and the other end of the first breaker is connected with the first low-power load DC-DC voltage reduction isolation device;
the first 1 section of low-power load is connected with the first low-power load low-voltage direct-current bus bar through the first 1 section of low-power load inversion power supply device;
the first 2 sections of low-power loads are connected with the first low-power load low-voltage direct-current bus bar through the first 2 sections of low-power load inversion power supply devices.
8. A FM system as claimed in claim 5, wherein said DC controllable load four means comprises: the second high-voltage motor is connected with the second high-voltage motor inversion driving device through the second high-voltage motor grid-connected switch;
the five direct-current controllable load devices comprise: the second high-voltage load is connected with the second high-voltage load inversion power supply device through the second high-voltage load grid-connected switch.
9. A frequency modulation system according to claim 8 wherein the dc controllable load six means comprises: the system comprises a second circuit breaker, a second low-power load low-voltage direct-current bus, a second 1-section low-power load inversion power supply device, a second 1-section low-power load, a second 2-section low-power load inversion power supply device and a second 2-section low-power load;
one end of the second breaker is connected with the second low-power load low-voltage direct-current bus bar, and the other end of the second breaker is connected with the second low-power load DC-DC step-down isolation device;
the second 1 section of low-power load is connected with the second low-power load low-voltage direct-current bus bar through the second 1 section of low-power load inversion power supply device;
and the second 2 sections of low-power loads are connected with the second low-power load low-voltage direct-current bus bar through the second 2 sections of low-power load inversion power supply devices.
10. A frequency modulation system according to any one of claims 7 or 9 wherein the number of first 1 segment low power loads, the number of first 2 segment low power loads, the number of second 1 segment low power loads and the number of second 2 segment low power loads are N, N being an integer greater than or equal to 1.
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| CN202222361592.2U CN218586894U (en) | 2022-09-05 | 2022-09-05 | Frequency modulation system based on concentrated rectifying device |
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