CN110797914B - Rapid frequency control method and system for new energy station - Google Patents
Rapid frequency control method and system for new energy station Download PDFInfo
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Abstract
When monitoring that grid frequency f obtained by sampling grid-connected points of a new energy station exceeds a dead zone range, controlling a grid frequency sampling monitoring device to enter a fast frequency sampling period working mode and lock frequency to a power station AGC active instruction P0 before entering the dead zone, and obtaining real-time grid frequency f and real-time power station AGC active instruction P1; and then calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone so as to control the power of the energy resource unit. The response speed can be realized fast, and the technical requirements are met. In addition, the technology of the invention is friendly to the established new energy power station, can be transformed in a small range to realize the fast frequency control of the new energy power station, has small hardware transformation difficulty, is not constrained by factors such as the type of the new energy station, the geographic environment, the communication mode/protocol and the like, and has good operability.
Description
Technical Field
The application belongs to the technical field of new energy station control, and particularly relates to a new energy station fast frequency control method and system.
Background
The northwest power grid requires that the new energy station has a fast frequency control (short for "fast frequency") capability, and provides clear requirements for frequency modulation characteristics and response time. Under the background, technical transformation is carried out on new energy stations at a time, the typical measures are to transform the AGC of the new energy station and increase the frequency control function, however, the method has risks in response time and adjustment time, and the superposition time of AGC frequency modulation control calculation, communication and new energy unit response is difficult to meet the requirement of frequency rapid control; the other implementation measure is that the control strategy of the new energy unit is optimized and upgraded, and the frequency control function is added.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the defects in the prior art, a method and a system for responding and performing rapid frequency control on an energy station are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a rapid frequency control method for a new energy station, which comprises the following steps:
s1: monitoring a new energy station grid-connected point, sampling to obtain a power grid frequency f, and judging whether the power grid frequency f is in a dead zone range;
s2: if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy unit, and collecting feedback information of the new energy units;
if the power grid frequency f exceeds the dead zone range, reducing the sampling period, locking the frequency to enter a power station AGC active instruction P0 before the dead zone, and acquiring the real-time power grid frequency f and a real-time power station AGC active instruction P1;
s3: calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone;
s4: and issuing a fast frequency control active power instruction to a new energy unit, and continuously monitoring the power grid frequency until the power grid frequency is in a dead zone range.
Preferably, the new energy station rapid frequency control method of the invention,
the fast frequency control active power command in step S3 is to perform active power control Pcmd,
when f is<fdnAnd P1<P0
Or alternatively
f>fupAnd P1>At P0, Pcmd ═ P0+ Δ P;
when f is<fdnAnd P1<P0
Or
f>fupAnd P1<P0, Pcmd ═ P1+ Δ P
Wherein, Δ P ═ kup*(fup-f),f>fup；ΔP＝kdn*(fdn-f),f<fdn；
In the formula fdnAnd fupLower and upper limits, k, of the dead zone range, respectivelyupAnd k isdnRespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
Preferably, according to the new energy station fast frequency control method, when the sampling period is reduced and the frequency is locked, the adjusted sampling period is 0.1% of the normal sampling period.
Preferably, according to the rapid frequency control method for the new energy station, the sampling period is adjusted to be not more than 20 ms.
Preferably, in the new energy station fast frequency control method according to the present invention, in the step S4, when the grid frequency is restored to be within the dead zone range, the sampling period is controlled to be restored to the initial value normal sampling period.
The invention also provides a system for controlling the rapid frequency of the new energy station, which comprises:
the power grid frequency sampling monitoring device is used for monitoring a new energy station grid-connected point and sampling to obtain a power grid frequency f, and judging whether the power grid frequency f is in a dead zone range, wherein the power grid frequency sampling monitoring device has a normal sampling period working mode and a fast frequency sampling period working mode;
and the fast frequency control device is used for generating a fast frequency control active power instruction and sending the fast frequency control active power instruction to the new energy station so as to control the power of the unit of the new energy station.
Preferably, the new energy station rapid frequency control system of the invention,
if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy unit, and collecting feedback information of the new energy units;
the fast frequency control device performs active power control Pcmd by the following method:
if the power grid frequency f exceeds the dead zone range, controlling the power grid frequency sampling monitoring device to enter a fast frequency sampling period working mode, locking a power station AGC active instruction P0 before the frequency enters the dead zone, and acquiring the real-time power grid frequency f and the real-time power station AGC active instruction P1;
then calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the size of the active instruction P0 of the power station AGC before entering the dead zone;
when f is<fdnAnd P1<P0
Or
f>fupAnd P1>At P0, Pcmd ═ P0+ Δ P;
when f is<fdnAnd P1<P0
Or
f>fupAnd P1<P0, Pcmd ═ P1+ Δ P
Wherein, Δ P ═ kup*(fup-f),f>fup；ΔP＝kdn*(fdn-f),f<fdn；
In the formula fdnAnd fupLower and upper limits, k, of the dead zone range, respectivelyupAnd k isdnRespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
Preferably, in the new energy station fast frequency control system according to the present invention, the sampling period of the fast sampling period operating mode may be less than 0.1% of the sampling period of the normal sampling period operating mode.
Preferably, in the new energy station fast frequency control system according to the present invention, the sampling period of the fast frequency sampling period operating mode is not greater than 20 ms.
Preferably, according to the new energy station fast frequency control system, when the grid frequency is restored to be within the dead zone range, the sampling period is controlled to be restored to the normal sampling period working mode.
The invention has the beneficial effects that:
the invention provides a method and a system for controlling the fast frequency of a new energy station.A power grid frequency sampling monitoring device is controlled to enter a fast frequency sampling period working mode and lock the frequency to a power station AGC active instruction P0 before entering a dead zone when monitoring that the power grid frequency f obtained by sampling a grid-connected point of the new energy station exceeds the dead zone range, and the real-time power grid frequency f and the real-time power instruction P1 of the power station AGC are obtained; and then calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone so as to control the power of the energy resource unit. The response speed can be realized fast, and the technical requirements are met. In addition, the technology of the invention is friendly to the established new energy power station, can be transformed in a small range to realize the fast frequency control of the new energy power station, has small hardware transformation difficulty, is not constrained by factors such as the type of the new energy station, the geographic environment, the communication mode/protocol and the like, and has good operability.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a logic diagram for triggering operation of a fast frequency control device in accordance with an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a new energy station fast frequency control layer in an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The embodiment provides a method for controlling the fast frequency of a new energy station, which comprises the following steps:
s1: monitoring a new energy station grid-connected point and sampling to obtain a power grid frequency f, and judging whether the power grid frequency f is in a dead zone range, wherein the sampling period can be 1min for example;
s2: if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy unit, and collecting feedback information of the new energy units (directly transmitting the active power control instruction of the ACG control device of the power station to the new energy units);
if the power grid frequency f exceeds the dead zone range, reducing the sampling period, locking the frequency to enter a power station AGC active instruction P0 before the dead zone, and acquiring the real-time power grid frequency f and a real-time power station AGC active instruction P1 (issued by a power station ACG control device); when the sampling period is reduced and the frequency is locked, the adjusted sampling period may be less than 0.1% of the normal sampling period, and the adjusted sampling period is not greater than 20ms, for example, may be adjusted to 10 ms.
S3: calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone;
the fast frequency control active power command is to perform active power control Pcmd,
when f is<fdnAnd P1<P0
Or alternatively
f>fupAnd P1>At P0, Pcmd ═ P0+ Δ P;
when f is<fdnAnd P1<P0
Or
f>fupAnd P1<P0, Pcmd ═ P1+ Δ P
Wherein, Δ P ═ kup*(fup-f),f>fup；ΔP＝kdn*(fdn-f),f<fdn；
In the formula fdnAnd fupLower and upper limits, k, of the dead zone range, respectivelyupAnd k isdnRespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
S4: and issuing a fast frequency control active power instruction to a new energy unit, and continuously monitoring the power grid frequency until the power grid frequency is in a dead zone range.
In the step S4, when the grid frequency is restored to the dead zone range, the sampling period is controlled to be restored to the initial value and the normal sampling period.
The communication between the new energy station and the fast frequency control device can be realized by modifying a communication field of the new energy set for receiving the instruction, so as to realize different response modes of the conventional AGC and the fast frequency control.
The new energy machine set receives an active power control instruction sent by the fast frequency control device, and whether a fast frequency response logic is started or not is judged according to a fast frequency response field;
if the fast frequency response is not started, the new energy unit keeps the original communication and control mode: receiving an instruction, feeding back instruction receiving information and executing the instruction;
if the fast frequency response is started, the new energy machine set receives the command, the fast response is successfully controlled, the command receiving information is not fed back, and the communication speed is improved;
and judging whether the fast frequency control logic needs to be exited or not according to the fast frequency response field.
Example 2
This embodiment provides a quick frequency control system of new forms of energy station, includes:
the power grid frequency sampling monitoring device is used for monitoring a new energy station grid-connected point and sampling to obtain a power grid frequency f, judging whether the power grid frequency f is in a dead zone range, and has a normal sampling period working mode and a fast frequency sampling period working mode, wherein the sampling period of the fast frequency sampling period working mode can be less than 0.1% of that of the normal sampling period working mode, the sampling period of the normal sampling period working mode can be 1min, and the sampling period of the fast frequency sampling period working mode is not more than 20ms, for example, can be adjusted to 10 ms;
the fast frequency control device is used for generating a fast frequency control active power instruction and sending the fast frequency control active power instruction to the new energy station so as to control the power of the unit of the new energy station;
if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy unit, and collecting feedback information of the new energy units;
the fast frequency control device performs active power control Pcmd by the following method:
if the power grid frequency f exceeds the dead zone range, controlling the power grid frequency sampling monitoring device to enter a fast frequency sampling period working mode, locking a power station AGC active instruction P0 before the frequency enters the dead zone, and acquiring the real-time power grid frequency f and the real-time power station AGC active instruction P1;
then calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the size of the active instruction P0 of the power station AGC before entering the dead zone;
when f is<fdnAnd P1<P0
Or alternatively
f>fupAnd P1>At P0, Pcmd ═ P0+ Δ P;
when f is<fdnAnd P1<P0
Or
f>fupAnd P1<P0, Pcmd ═ P1+ Δ P
Wherein, Δ P ═ kup*(fup-f),f>fup；ΔP＝kdn*(fdn-f),f<fdn；
In the formula fdnAnd fupLower and upper limits, k, of the dead zone range, respectivelyupAnd k isdnRespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
And after the fast frequency control active power instruction is issued to a new energy unit, the power grid frequency is continuously monitored by the power grid frequency sampling monitoring device until the power grid frequency is in the dead zone range.
And when the frequency of the power grid is restored to be within the dead zone range, controlling the sampling period to be restored to the normal sampling period working mode.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (10)
1. A rapid frequency control method for a new energy station is characterized by comprising the following steps:
s1: monitoring a new energy station grid-connected point, sampling to obtain a power grid frequency f, and judging whether the power grid frequency f is in a dead zone range;
s2: if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy source unit, and collecting feedback information of the new energy source units;
if the power grid frequency f exceeds the dead zone range, reducing the sampling period, locking the frequency to enter a power station AGC active instruction P0 before the dead zone, and acquiring the real-time power grid frequency f and a real-time power station AGC active instruction P1;
s3: calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone;
s4: and issuing a fast frequency control active power instruction to a new energy unit, and continuously monitoring the power grid frequency until the power grid frequency is in a dead zone range.
2. The new energy station fast frequency control method according to claim 1,
the fast frequency control active power command in step S3 is to perform active power control Pcmd,
when in usef<f dnAnd P1<P0
Or
f>f upAnd P1>At P0, Pcmd = P0+ Δ P;
when in usef<f dnAnd P1>P0
Or
f>f upAnd P1<P0, at Pcmd = P1+ Δ P
Wherein, DeltaP=k up*(f up-f),f>f up；ΔP=k dn*(f dn-f),f<f dn；
In the formulaf dnAndf uprespectively a lower limit value and an upper limit value of the dead zone range,k upandk dnrespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
3. The fast frequency control method for the new energy field station according to claim 1 or 2, wherein when the sampling period is reduced and the frequency is locked, the adjusted sampling period is 0.1% of the normal sampling period.
4. The fast frequency control method for the new energy resource site according to claim 3, characterized in that the sampling period is adjusted to not more than 20 ms.
5. The new energy station rapid frequency control method according to any one of claims 1 or 2, wherein in the step S4, when the grid frequency is restored to be within the dead zone range, the sampling period is controlled to be restored to the initial value normal sampling period.
6. A new energy station fast frequency control system, comprising:
the power grid frequency sampling monitoring device is used for monitoring a new energy station grid-connected point and sampling to obtain a power grid frequency f, and judging whether the power grid frequency f is in a dead zone range, wherein the power grid frequency sampling monitoring device has a normal sampling period working mode and a fast frequency sampling period working mode;
the fast frequency control device is used for generating a fast frequency control active power instruction and sending the fast frequency control active power instruction to the new energy station so as to control the power of the unit of the new energy station;
the fast frequency control device performs active power control Pcmd by the following method:
if the power grid frequency f exceeds the dead zone range, controlling the power grid frequency sampling monitoring device to enter a fast frequency sampling period working mode, locking a power station AGC active instruction P0 before the frequency enters the dead zone, and acquiring the real-time power grid frequency f and the real-time power station AGC active instruction P1;
and then calculating and generating a fast frequency control active power instruction according to the value of the power grid frequency f, the real-time active instruction P1 of the power station AGC and the active instruction P0 of the power station AGC before entering the dead zone.
7. The new energy station fast frequency control system according to claim 6,
if the power grid frequency f is in the dead zone range, normally issuing an active power control instruction of each new energy unit, and collecting feedback information of the new energy units;
when in usef<f dnAnd P1<P0
Or
f>f upAnd P1>At P0, Pcmd = P0+ Δ P;
when in usef<f dnAnd P1>P0
Or
f>f upAnd P1<P0, at Pcmd = P1+ Δ P
Wherein, DeltaP=k up*(f up-f),f>f up；ΔP=k dn*(f dn-f),f<f dn；
In the formulaf dnAndf uprespectively a lower limit value and an upper limit value of the dead zone range,k upandk dnrespectively, an over-frequency adjustment coefficient and an under-frequency adjustment coefficient.
8. The new energy station fast frequency control system according to claim 6 or 7, characterized in that the sampling period of the fast frequency sampling period operation mode is less than 0.1% of the sampling period of the normal sampling period operation mode.
9. The new energy station fast frequency control system according to claim 8, wherein the fast frequency sampling period operating mode has a sampling period of no more than 20 ms.
10. The new energy station fast frequency control system according to any one of claims 6 or 7, characterized in that when the grid frequency is restored to within the dead zone range, the sampling period is controlled to be restored to the normal sampling period operating mode.
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| CN111694332A (en) * | 2020-06-08 | 2020-09-22 | 中粮糖业辽宁有限公司 | Control method for load side control of sugar refinery single machine system fluctuation |
| CN112104009B (en) * | 2020-08-27 | 2022-05-31 | 国网电力科学研究院有限公司 | New energy centralized frequency correction anti-misoperation method and system |
| CN112398143A (en) * | 2020-10-28 | 2021-02-23 | 许继集团有限公司 | New energy power station frequency modulation control method and system containing energy storage |
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