CN210041339U - Frequency stabilization control device of electric power system - Google Patents
Frequency stabilization control device of electric power system Download PDFInfo
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Abstract
The utility model provides a frequency stabilization control device of an electric power system, which is suitable for an AC/DC asynchronous interconnected power grid and comprises a DC frequency control device, a generator frequency stabilization control device and a wind power plant frequency stabilization control device; the direct current frequency control device comprises a direct current frequency limiting controller, and the direct current frequency limiting controller is respectively connected with a bus of a converter station of the alternating current-direct current asynchronous interconnected power grid and the direct current power regulating device; a generator set primary frequency modulation controller and a high-frequency generator cutting machine controller of the generator frequency stabilization control device are respectively connected with the generator, and the high-frequency generator cutting machine controller is connected with a generator cutting machine control switch of the generator; the wind power plant frequency stabilization control device is connected with a wind turbine controller, a bus of an alternating current-direct current asynchronous interconnected power grid and a collecting line of a wind power plant respectively, and the wind turbine controller is connected with a wind turbine of the wind power plant. The utility model discloses can realize wind-powered electricity generation's frequency stability control function, maintain electric wire netting system's frequency stability.
Description
Technical Field
The utility model belongs to the technical field of the electric power system technique and specifically relates to a frequency stabilization control device of electric power system is related to.
Background
With the development of domestic AC/DC interconnected power grids, power transmission grid frames of two power grid companies in China already form AC/DC asynchronous interconnected systems, and power grids in southwest regions operate asynchronously with a main grid through DC power transmission. After asynchronous networking operation, the inertia of a generator of a sending end system is reduced, the PID parameters of the primary frequency modulation of the generator set are adjusted for inhibiting ultralow frequency oscillation, the total frequency regulation effect of the generator is reduced, and the frequency stability of the system is reduced. Once the power grid has serious faults such as large-capacity outgoing direct current blocking and the like, the power of the power grid at the sending end is abundant, the frequency is greatly increased, the problem of frequency stability exists, and comprehensive control measures such as a direct current frequency limit control function, a stable control generator tripping, a high-frequency generator tripping, primary frequency modulation and the like need to be adopted to maintain the frequency stability of the system.
In the prior art, the method mainly utilizes the primary frequency modulation capability of generators such as water and fire, a direct current frequency limit control function, a stable control generator tripping machine, a high frequency generator tripping machine and other means to carry out stable control on the system frequency, and does not consider wind power frequency control measures. Due to the change of system operation boundary conditions, such as the influence of increased new energy ratio without frequency control function, ultralow frequency oscillation and the like, the existing frequency stabilization control means and regulation capability can not meet the requirement of system frequency stabilization. In addition, the existing fan frequency modulation function is mostly based on the frequency control measures of fault events or power shortage, such as direct current locking, and the problem that all alternating current and direct current complex system frequency disturbances cannot be solved. For example, the problem of frequency fluctuation caused by short-time and large-capacity power shortage due to common multi-DC commutation failure in China can reach the threshold value of a high-frequency generator tripping. However, in this case, the dc power and the system frequency will return to normal levels in a short time frame, and if the high frequency generator tripping action is performed, unnecessary generator disconnection and power shortage of the grid will be caused. Wind power is used as a high-quality new energy, is widely applied to energy construction in China and has a good prospect. Therefore, as the proportion of wind power in a transmission-end power grid is increased continuously, the total frequency regulation capacity of the generators in the area is reduced gradually, the frequency stability control requirement is difficult to meet only by means of the existing frequency control means, and the problem of system frequency stability is increasingly prominent.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an electric power system's frequency stabilization controlling means to realize wind-powered electricity generation's frequency stabilization control function, maintain electric power system's frequency stabilization.
In order to solve the technical problem, an embodiment of the present invention provides a frequency stabilization control device for an electric power system, which is suitable for an ac/dc asynchronous interconnected grid, and includes a dc frequency control device, a generator frequency stabilization control device, and a wind farm frequency stabilization control device;
the direct-current frequency control device comprises a direct-current frequency limiting controller, and the direct-current frequency limiting controller is respectively connected with a bus of a converter station of the alternating-current/direct-current asynchronous interconnected power grid and a direct-current power regulating device;
the generator frequency stabilization control device comprises a generator set primary frequency modulation controller and a high-frequency generator cutting machine controller, wherein the generator set primary frequency modulation controller and the high-frequency generator cutting machine controller are respectively connected with a generator, and the high-frequency generator cutting machine controller is connected with a generator cutting machine control switch of the generator;
the wind power plant frequency stabilization control device comprises a fan controller and a fan frequency stabilization control device, the fan frequency stabilization control device is respectively connected with the fan controller, a bus of the alternating current-direct current asynchronous interconnected power grid and a collection line of a wind power plant, and the fan controller is connected with a fan of the wind power plant.
As a preferred scheme, the fan frequency stabilization control device comprises a stabilization control main station and a plurality of stabilization control substations;
the stability control main station is connected with a bus of the alternating current-direct current asynchronous interconnected power grid and the stability control substation respectively, and the stability control substation is connected with a collection line of the wind power plant and the fan controller respectively.
As a preferred scheme, the stable control master station comprises a voltage acquisition module, a master station processor and a master station communication module;
the input end of the voltage acquisition module is connected with a bus of the alternating current-direct current asynchronous interconnected power grid, the output end of the voltage acquisition module is connected with the input end of the master station processor, and the output end of the master station processor is connected with the master station communication module;
the stability control substation comprises a three-phase voltage and current acquisition module, a substation processor and a substation communication module;
the input end of the three-phase voltage and current acquisition module is connected with a collection line of the wind power plant, the output end of the three-phase voltage and current acquisition module is connected with the input end of the substation processor, and the output end of the substation processor is respectively connected with the substation communication module and the fan controller;
and the master station communication module is in communication connection with the substation communication module.
As a preferred scheme, the master station communication module is connected with the substation communication module through a 2M communication channel.
Compared with the prior art, the utility model has the advantages that the utility model provides a frequency stabilization control device of an electric power system, which is suitable for an AC/DC asynchronous interconnected power grid, and comprises a DC frequency control device, a generator frequency stabilization control device and a wind power plant frequency stabilization control device; the direct-current frequency control device comprises a direct-current frequency limiting controller, and the direct-current frequency limiting controller is respectively connected with a bus of a converter station of the alternating-current/direct-current asynchronous interconnected power grid and a direct-current power regulating device; the generator frequency stabilization control device comprises a generator set primary frequency modulation controller and a high-frequency generator cutting machine controller, wherein the generator set primary frequency modulation controller and the high-frequency generator cutting machine controller are respectively connected with a generator, and the high-frequency generator cutting machine controller is connected with a generator cutting machine control switch of the generator; the wind power plant frequency stabilization control device comprises a fan controller and a fan frequency stabilization control device, the fan frequency stabilization control device is respectively connected with the fan controller, a bus of the alternating current-direct current asynchronous interconnected power grid and a collection line of a wind power plant, and the fan controller is connected with a fan of the wind power plant.
Through direct current frequency control device generator frequency stability control device and wind-powered electricity generation field frequency stability control device carries out frequency stability control to the electric wire netting system jointly, both be applicable to water and electricity, thermoelectricity, can play the frequency control effect to wind-powered electricity generation again, be favorable to maintaining electric wire netting system's frequency stability.
After asynchronous networking operation, the inertia of a generator of a sending end system is reduced, and in order to inhibit ultralow frequency oscillation, PID parameters of primary frequency modulation of a unit are adjusted, so that the total frequency regulation effect of the generator is reduced, and the frequency stability of the system is reduced. Once a power grid has serious faults such as large-capacity outgoing direct current blocking and the like, a large amount of power of the power grid at a sending end is surplus, the frequency is greatly increased, and the problem of frequency stability exists, and the system frequency can be maintained to be stable through the direct current frequency limiting control function of the direct current frequency limiting controller, the primary frequency modulation of the generator set primary frequency modulation controller and the high-frequency generator tripping controller, the stability control generator tripping, the high-frequency generator tripping and other comprehensive control measures.
The fan frequency stability control device is an existing stability control device, can be based on frequency amplitude and frequency change rate, and has the characteristic of being capable of being quickly adjusted by means of a fan, and the function of quickly reducing the power of a wind power plant before a high-frequency generator tripping action so as to achieve the purpose of inhibiting high frequency is achieved. The fan frequency stability control device and the fan controller have a synergistic effect, have the functions of collecting a system voltage and a three-phase voltage and current collecting module of a wind power plant collecting line, and can calculate and obtain frequency data according to the collected data, so that the recovery control after the fan power is reduced is realized through the wind power controller.
Drawings
Fig. 1 is a schematic structural diagram of a frequency stabilization control device of an electric power system in an embodiment of the present invention;
fig. 2 is a schematic diagram of a frequency stabilization control apparatus of an electric power system in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fan frequency stabilization control device in an embodiment of the present invention;
FIG. 4 shows a logic diagram of the regulated master station of FIG. 3;
FIG. 5 shows a logical schematic diagram of the stability control substation of FIG. 3;
fig. 6 is a control schematic diagram of an extension controller in an embodiment of the present invention;
wherein the reference numbers in the drawings of the specification are as follows:
1. a DC frequency limit controller; 2. a primary frequency modulation controller of the generator set; 3. a high cycle cutter controller; 4. a fan controller; 5. a fan frequency stabilization control device; 51. a stable control master station; 52. and (5) stabilizing and controlling the substation.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a frequency stabilization control device for an electric power system, which is suitable for an ac/dc asynchronous interconnected power grid, and includes a dc frequency control device, a generator frequency stabilization control device, and a wind farm frequency stabilization control device;
the direct-current frequency control device comprises a direct-current frequency limit controller 1, and the direct-current frequency limit controller 1 is respectively connected with a bus of a converter station of the alternating-current/direct-current asynchronous interconnected power grid and a direct-current power regulating device;
the generator frequency stabilization control device comprises a generator set primary frequency modulation controller 2 and a high-frequency generator cutting machine controller 3, wherein the generator set primary frequency modulation controller 2 and the high-frequency generator cutting machine controller 3 are respectively connected with a generator, and the high-frequency generator cutting machine controller 3 is connected with a generator cutting machine control switch of the generator;
the wind power plant frequency stabilization control device comprises a fan controller 4 and a fan frequency stabilization control device 5, the fan frequency stabilization control device 5 is respectively connected with the fan controller 4, a bus of the alternating current-direct current asynchronous interconnected power grid and a collection line of a wind power plant, and the fan controller 4 is connected with a fan of the wind power plant.
In this embodiment, through direct current frequency control device, generator frequency stability control device and wind-powered electricity generation field frequency stability control device carries out frequency stability control to the electric wire netting jointly, both be applicable to water and electricity, thermoelectricity, can play the frequency control effect to wind-powered electricity generation again, be favorable to maintaining the frequency stability of electric wire netting system.
After asynchronous networking operation, the inertia of a generator of a sending end system is reduced, and in order to inhibit ultralow frequency oscillation, PID parameters of primary frequency modulation of a unit are adjusted, so that the total frequency regulation effect of the generator is reduced, and the frequency stability of the system is reduced. Once a power grid has serious faults such as large-capacity outgoing direct current blocking and the like, a large amount of power of the power grid at a sending end is surplus, the frequency is greatly increased, and the problem of frequency stability exists, and the system frequency can be maintained to be stable through the direct current frequency limiting control function of the direct current frequency limiting controller 1, the primary frequency modulation of the generator set primary frequency modulation controller 2 and the high-frequency generator tripping controller 3, the stable control generator tripping, the high-frequency generator tripping and other comprehensive control measures.
The fan frequency stability control device 5 is an existing stability control device, can be based on a frequency amplitude and a frequency change rate, and has the characteristic of being capable of being quickly adjusted by means of a fan, and the function of quickly reducing the power of a wind power plant before a high-frequency generator tripping action is achieved so as to achieve the purpose of inhibiting high frequency. The fan frequency stability control device 5 and the fan controller 4 act in a synergistic mode, the function of collecting system voltage and three-phase voltage and current of a wind power plant collecting line is achieved, frequency data can be obtained through calculation according to collected data, and therefore recovery control after fan power is reduced is achieved through the wind power controller.
Referring to fig. 3, in the present embodiment, it should be noted that the fan frequency stabilizing control device 5 is implemented by using an existing stabilizing control device, and the fan frequency stabilizing control device 5 interacts with the fan controller 4. The fan frequency stability control device 5 adopts a centralized stability control structure and is divided into a main station and a sub station. The main station and the sub-station adopt 2M communication, the sub-station and the fan controller 4 adopt switching value (analog quantity or digital quantity) to realize communication, and the specific implementation mode is as follows:
in the embodiment of the present invention, the fan frequency stabilization control device 5 includes a stabilization control master station 51 and a plurality of stabilization control slave stations 52;
the stability control master station 51 is connected with a bus of the alternating current-direct current asynchronous interconnected power grid and the stability control substation 52 respectively, and the stability control substation 52 is connected with a collection line of the wind power plant and the fan controller 4 respectively.
The stable control master station 51 comprises a voltage acquisition module, a master station processor and a master station communication module; the input end of the voltage acquisition module is connected with a bus of the alternating current-direct current asynchronous interconnected power grid, the output end of the voltage acquisition module is connected with the input end of the master station processor, and the output end of the master station processor is connected with the master station communication module;
the working principle of the stable control master station 51 is as follows: the voltage acquisition module acquires system voltage, the master station processor calculates system frequency and frequency change rate, executes a stability control strategy, and transmits an action exit command to the stability control substation 52 through the master station communication module.
The stability control substation 52 comprises a three-phase voltage and current acquisition module, a substation processor and a substation communication module; the input end of the three-phase voltage current is connected with a collection line of the wind power plant, the output end of the three-phase voltage current is connected with the input end of the substation processor, and the output end of the substation processor is respectively connected with the substation communication module and the fan controller 4;
the working principle of the stability control substation 52 is as follows: the three-phase voltage and current acquisition module acquires three-phase voltage and current of a wind power plant collection line, the substation processor calculates the adjustable quantity of the wind power plant and sends the adjustable quantity to the stability control master station 51, and action signals sent by the stability control master station 51 send power back-down and recovery commands to the fan controller 4 through switching quantity.
The fan frequency stabilizing control device 5 is implemented by means of an existing stabilizing control device, and in order to help better understand the implementation working principle of the present technical solution, the working principle of the stabilizing control master station 51 and the stabilizing control slave station 52 is explained in detail below:
the stability control strategy of the stability control master station 51 is shown in fig. 4:
the stability control master station 51 receives the real-time power information of the wind power plant from the stability control substation 52, collects the bus voltage of the station (500kV station), and calculates the frequency and the frequency change rate in real time. When the frequency is greater than fset1 and the frequency change rate is greater than dfset1, the grid power shortage dfset1 multiplied by K is calculated after the time delay of tset1 according to the frequency change rate and the difference adjusting power K of the grid, the power percentage required to be adjusted back by the wind power plant is calculated according to the total power of the wind power plant collected by the station, and the power percentage is sent to the stable control substation through 2M communication. When the frequency is less than fset2 and the frequency rate of change is less than dfset2, a power recovery command is sent to the substation.
The stability control strategy of the stability control substation 52 is shown in fig. 5:
the stability control sub-station 52 transmits the power collected from the wind power plant of the station to the stability control main station 51 in real time; and sending the power back-down command (percentage) sent by the stability control master station 51 to the fan controller 4 in a switching value mode, wherein the fan controller 4 converts the command into a power command and superposes the power command on a power reference value of an expired master control link to carry out back-down power. Therefore, the stable control sub-station 52 receives the power recovery command of the stable control main station 51 and sends the power recovery command to the fan controller 4 in a switching value manner, as shown in fig. 6, after receiving the command, the fan controller 4 slowly reduces the back-down power value to 0 through a ramp function.
Compared with the prior art, the utility model provides a frequency stabilization control device of an electric power system, which is suitable for an AC/DC asynchronous interconnected power grid and comprises a DC frequency control device, a generator frequency stabilization control device and a wind power plant frequency stabilization control device; the direct-current frequency control device comprises a direct-current frequency limit controller 1, and the direct-current frequency limit controller 1 is respectively connected with a bus of a converter station of the alternating-current/direct-current asynchronous interconnected power grid and a direct-current power regulating device; the generator frequency stabilization control device comprises a generator set primary frequency modulation controller 2 and a high-frequency generator cutting machine controller 3, wherein the generator set primary frequency modulation controller 2 and the high-frequency generator cutting machine controller 3 are respectively connected with a generator, and the high-frequency generator cutting machine controller 3 is connected with a generator cutting machine control switch of the generator; the wind power plant frequency stabilization control device comprises a fan controller 4 and a fan frequency stabilization control device 5, the fan frequency stabilization control device 5 is respectively connected with the fan controller 4, a bus of the alternating current-direct current asynchronous interconnected power grid and a collection line of a wind power plant, and the fan controller 4 is connected with a fan of the wind power plant. Has the following beneficial effects:
(1) through direct current frequency control device generator frequency stability control device and wind-powered electricity generation field frequency stability control device carries out frequency stability control to the electric wire netting system jointly, both be applicable to water and electricity, thermoelectricity, can play the frequency control effect to wind-powered electricity generation again, be favorable to maintaining electric wire netting system's frequency stability.
(2) After asynchronous networking operation, the inertia of a generator of a sending end system is reduced, and in order to inhibit ultralow frequency oscillation, PID parameters of primary frequency modulation of a unit are adjusted, so that the total frequency regulation effect of the generator is reduced, and the frequency stability of the system is reduced. Once a power grid has serious faults such as large-capacity outgoing direct current blocking and the like, a large amount of power of the power grid at a sending end is surplus, the frequency is greatly increased, and the problem of frequency stability exists, and the system frequency can be maintained to be stable through the direct current frequency limiting control function of the direct current frequency limiting controller 1, the primary frequency modulation of the generator set primary frequency modulation controller 2 and the high-frequency generator tripping controller 3, the stable control generator tripping, the high-frequency generator tripping and other comprehensive control measures.
(3) The fan frequency stability control device 5 is an existing stability control device, can be based on a frequency amplitude and a frequency change rate, and has the characteristic of being capable of being quickly adjusted by means of a fan, and the function of quickly reducing the power of a wind power plant before a high-frequency generator tripping action is achieved so as to achieve the purpose of inhibiting high frequency. The fan frequency stability control device 5 and the fan controller 4 act in a synergistic mode, have the functions of collecting a system voltage and a three-phase voltage and current collecting module of a wind power plant collecting line, and can calculate according to collected data to obtain frequency data, so that recovery control after fan power is reduced is achieved through the wind power controller.
(4) The function and the system of the wind power participating in the system frequency stability control are considered, the method is different from a fan frequency control mode based on a fault event, the fan power drop-back and the power recovery based on the frequency amplitude and the frequency change rate are considered, the power modulation of permanent faults and the power recovery of temporary disturbance can be realized, and the frequency stability characteristic of the system is effectively improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (4)
1. A frequency stabilization control device of a power system is suitable for an alternating current-direct current asynchronous interconnected power grid and is characterized by comprising a direct current frequency control device, a generator frequency stabilization control device and a wind power plant frequency stabilization control device;
the direct-current frequency control device comprises a direct-current frequency limiting controller, and the direct-current frequency limiting controller is respectively connected with a bus of a converter station of the alternating-current/direct-current asynchronous interconnected power grid and a direct-current power regulating device;
the generator frequency stabilization control device comprises a generator set primary frequency modulation controller and a high-frequency generator cutting machine controller, wherein the generator set primary frequency modulation controller and the high-frequency generator cutting machine controller are respectively connected with a generator, and the high-frequency generator cutting machine controller is connected with a generator cutting machine control switch of the generator;
the wind power plant frequency stabilization control device comprises a fan controller and a fan frequency stabilization control device, the fan frequency stabilization control device is respectively connected with the fan controller, a bus of the alternating current-direct current asynchronous interconnected power grid and a collection line of a wind power plant, and the fan controller is connected with a fan of the wind power plant.
2. The frequency stabilization control device of the power system according to claim 1, wherein the fan frequency stabilization control device includes a stabilization control master station and a plurality of stabilization control sub-stations;
the stability control main station is connected with a bus of the alternating current-direct current asynchronous interconnected power grid and the stability control substation respectively, and the stability control substation is connected with a collection line of the wind power plant and the fan controller respectively.
3. The apparatus of claim 2, wherein the stable control master station comprises a voltage acquisition module, a master station processor, and a master station communication module;
the input end of the voltage acquisition module is connected with a bus of the alternating current-direct current asynchronous interconnected power grid, the output end of the voltage acquisition module is connected with the input end of the master station processor, and the output end of the master station processor is connected with the master station communication module;
the stability control substation comprises a three-phase voltage and current acquisition module, a substation processor and a substation communication module;
the input end of the three-phase voltage and current acquisition module is connected with a collection line of the wind power plant, the output end of the three-phase voltage and current acquisition module is connected with the input end of the substation processor, and the output end of the substation processor is respectively connected with the substation communication module and the fan controller;
and the master station communication module is in communication connection with the substation communication module.
4. The frequency stabilization control apparatus of a power system according to claim 3, wherein the master station communication module and the slave station communication module are connected by a 2M communication channel.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564900A (en) * | 2020-04-14 | 2020-08-21 | 云南电网有限责任公司 | Stability control system comprising multiple direct current coordinated control main stations and regional stability control substations |
| CN111884229A (en) * | 2020-08-19 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Asynchronous and synchronous control method and system for back-to-back flexible direct current power transmission system |
| CN112147977A (en) * | 2020-08-19 | 2020-12-29 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current power transmission system |
| CN117638998A (en) * | 2024-01-25 | 2024-03-01 | 国网经济技术研究院有限公司 | Multi-DC frequency controller optimization method considering frequency modulation standby of asynchronous interconnected power grid |
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2019
- 2019-05-27 CN CN201920776327.6U patent/CN210041339U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111564900A (en) * | 2020-04-14 | 2020-08-21 | 云南电网有限责任公司 | Stability control system comprising multiple direct current coordinated control main stations and regional stability control substations |
| CN111564900B (en) * | 2020-04-14 | 2023-09-22 | 云南电网有限责任公司 | Stability control system comprising multiple direct current coordination control master stations and regional stability control substations |
| CN111884229A (en) * | 2020-08-19 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Asynchronous and synchronous control method and system for back-to-back flexible direct current power transmission system |
| CN112147977A (en) * | 2020-08-19 | 2020-12-29 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current power transmission system |
| CN111884229B (en) * | 2020-08-19 | 2022-03-08 | 南方电网科学研究院有限责任公司 | Asynchronous and synchronous control method and system for back-to-back flexible direct current power transmission system |
| CN112147977B (en) * | 2020-08-19 | 2023-09-01 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current transmission system |
| CN117638998A (en) * | 2024-01-25 | 2024-03-01 | 国网经济技术研究院有限公司 | Multi-DC frequency controller optimization method considering frequency modulation standby of asynchronous interconnected power grid |
| CN117638998B (en) * | 2024-01-25 | 2024-04-05 | 国网经济技术研究院有限公司 | Multi-DC frequency controller optimization method considering frequency modulation standby of asynchronous interconnected power grid |
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