CN110247405B - Reactive scheduling control method and system and data processing module - Google Patents
Reactive scheduling control method and system and data processing module Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a reactive scheduling control method, a system and a data processing module, under the condition that a station controller detects that a reactive oscillation phenomenon exists in the system, the method has the advantages that the process that the data processing module carries out smooth filtering processing on numerical values in the reactive control instruction generated by the station controller is added, the variation trend of the numerical values in the reactive control instruction received by the grid-connected inverter is slowed down, grid-connected inverter oscillation phenomenon caused by numerical value jumping in the reactive control instruction is avoided, the station controller generates the reactive control instruction to carry out reactive closed-loop control by comparing reactive scheduling requirements of a power grid with reactive power feedback quantity of grid-connected points, errors between the numerical values in the reactive control instruction issued by the station controller and the numerical values in the reactive control instruction received by the grid-connected inverter can be eliminated through the reactive closed-loop control, and the accuracy of the reactive scheduling control of the system is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a reactive power dispatching control method, a reactive power dispatching control system and a data processing module.
Background
With the development of photovoltaic power generation technology, the amount of new photovoltaic installation machines is larger and larger, the photovoltaic power generation amount of a power grid is also larger and larger, and the response requirements of power companies on characteristics such as active power, reactive power and frequency of a photovoltaic power station are increasingly strict.
In the aspect of reactive Power scheduling, a Power Plant Controller (PPC) in most of existing photovoltaic Power station control systems responds to a reactive Power scheduling requirement of a Power grid, a reactive Power control instruction is output by comparing the reactive Power scheduling requirement with a Point of Common Coupling (PCC) reactive Power feedback quantity, and each grid-connected inverter in a control array outputs specified reactive Power in a reactive closed-loop control manner by broadcasting the reactive Power control instruction, so that the requirement of responding to the reactive Power scheduling of the Power grid is met.
At present, a photovoltaic power station control system has multiple selectable reactive power regulation modes, but the reactive power dispatching control method is only suitable for a QT (reactive ratio) reactive power regulation mode and cannot meet the reactive power dispatching control precision requirements in other reactive power regulation modes. Therefore, a reactive power scheduling control method which can be adapted to various reactive power regulation modes and meet the requirement of reactive power scheduling control accuracy is needed.
Disclosure of Invention
In view of this, the invention provides a reactive power scheduling control method and system, which are suitable for various reactive power regulation modes and improve the accuracy of reactive power scheduling control of the system.
In order to achieve the above purpose, the invention provides the following specific technical scheme:
a reactive power scheduling control method, comprising:
entering an activation state under the condition that a reactive power control command sent by a power station controller is monitored to be in a second-level jump state;
carrying out smooth filtering processing on numerical values in reactive control instructions sent by the power station controller;
and broadcasting the processed reactive control instruction to a grid-connected inverter in the photovoltaic array.
Optionally, the method further includes:
monitoring the number of times of the change of the reactive power control instruction value sent by the power station controller in a preset period;
and when the number of times of monitoring the numerical value change of the reactive control instruction exceeds a preset value, judging that the reactive control instruction sent by the power station controller is in a second-level jump state.
Optionally, the method further includes:
determining the median of values in all reactive control instructions sent by the station controller in the preset period as an instruction jumping point;
and setting a command filtering range according to the command jumping point and the number of times of the numerical value change of the reactive control command sent by the station controller in the preset period.
Optionally, the setting of the instruction filtering range according to the instruction trip point and the number of times of the change of the reactive power control instruction value sent by the station controller in the preset period includes:
identifying the type of a reactive power control instruction sent by the power station controller, and determining a reactive power regulation mode;
determining a filter range factor according to the reactive power regulation mode;
and taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the numerical value change of the reactive control instruction sent by the power station controller in the preset period and the filtering range factor.
Optionally, the performing smooth filtering processing on the numerical value in the reactive power control instruction sent by the power plant controller includes:
and when the numerical value in the reactive power control instruction sent by the power station controller is within the instruction filtering range, performing smooth filtering processing on the numerical value in the reactive power control instruction sent by the power station controller, so that the error between the numerical value in the processed reactive power control instruction and the numerical value in the reactive power control instruction before processing is within a preset precision range.
Optionally, the method further includes:
and under the condition of being in an inactivated state, broadcasting a reactive power control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array.
A data processing module comprising:
the state activation unit is used for entering an activation state under the condition that a reactive power control command sent by the station controller is monitored to be in a second-level jump state;
the filtering processing unit is used for carrying out smooth filtering processing on numerical values in the reactive power control command sent by the power station controller;
and the instruction broadcasting unit is used for broadcasting the processed reactive control instruction to the grid-connected inverter in the photovoltaic array.
Optionally, the data processing module further includes:
and the state monitoring unit is used for monitoring the number of times of the numerical change of the reactive control instruction sent by the power station controller in a preset period, and when the number of times of the numerical change of the reactive control instruction is monitored to exceed a preset value, the reactive control instruction sent by the power station controller is judged to be in a second-level jump state.
Optionally, the data processing module further includes a filtering range setting unit;
the filtering range setting unit includes:
the instruction jumping point determining subunit is used for determining the median of numerical values in all reactive control instructions sent by the power station controller in the preset period as an instruction jumping point;
and the filtering range setting subunit is used for setting a command filtering range according to the command jumping point and the number of times of the change of the reactive control command value sent by the power station controller in the preset period.
Optionally, the filtering range setting subunit is specifically configured to identify a type of a reactive power control instruction sent by the power plant controller, and determine a reactive power regulation mode; determining a filter range factor according to the reactive power regulation mode; and taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the numerical value change of the reactive control instruction sent by the power station controller in the preset period and the filtering range factor.
Optionally, the filtering processing unit is specifically configured to, when a numerical value in the reactive power control instruction sent by the power plant controller is within the instruction filtering range, perform smooth filtering processing on the numerical value in the reactive power control instruction sent by the power plant controller, so that an error between the numerical value in the reactive power control instruction after processing and the numerical value in the reactive power control instruction before processing is within a preset precision range.
Optionally, the instruction broadcasting unit is further configured to broadcast the reactive control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array when the instruction broadcasting unit is in an inactive state.
A reactive scheduling control system comprises a power station controller, a data processing module and a grid-connected inverter;
the power station controller is used for generating a reactive power control instruction by comparing the reactive power dispatching requirement of the power grid with the reactive power feedback quantity of the grid-connected point and sending the generated reactive power control instruction to the data processing module;
the data processing module is used for executing the reactive power dispatching control method;
and the grid-connected inverter is used for receiving the reactive power control instruction broadcasted by the data processing module and outputting the reactive power corresponding to the received reactive power control instruction.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a reactive scheduling control method, under the condition that a power station controller detects that a reactive oscillation phenomenon exists in a system, the method has the advantages that the process that the data processing module carries out smooth filtering processing on numerical values in the reactive control instruction generated by the station controller is added, the variation trend of the numerical values in the reactive control instruction received by the grid-connected inverter is slowed down, grid-connected inverter oscillation phenomenon caused by numerical value jumping in the reactive control instruction is avoided, the station controller generates the reactive control instruction to carry out reactive closed-loop control by comparing reactive scheduling requirements of a power grid with reactive power feedback quantity of grid-connected points, errors between the numerical values in the reactive control instruction issued by the station controller and the numerical values in the reactive control instruction received by the grid-connected inverter can be eliminated through the reactive closed-loop control, and the accuracy of the reactive scheduling control of the system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of a reactive power scheduling control method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for setting a command filtering range according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another reactive power scheduling control method according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a data processing module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a reactive power scheduling control system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventor finds that the existing reactive power dispatching control method is only suitable for a QT (reactive ratio) reactive power regulation mode, the numerical value in the reactive power control instruction is a reactive power change value, and the numerical value in the reactive power control instruction is influenced only by the reactive power dispatching requirement of a power grid, so that the phenomenon of numerical value jumping in the reactive power control instruction rarely occurs. If the PPC needs the grid-connected inverter to respond to reactive scheduling according to reactive power regulation modes such as PF (power factor), Qu (power grid voltage), Qp (active power) and the like, numerical values in a reactive control instruction are not pure reactive power change values but are power grid voltage, power factors or active power, the power grid voltage, the power factors and the active power can dynamically change along with the power grid voltage, power grid impedance, illumination intensity and other factors, so that the numerical values in the reactive control instruction frequently change, and the frequent changes of the power grid voltage, the power factors or the active power can cause the jump of reactive power values needing to be output by the grid-connected inverter, so that the grid-connected inverter can not accurately output the specified reactive power, and the reactive scheduling control precision is reduced.
In order to solve the above technical problem, this embodiment discloses a reactive power scheduling control method, which is applied to a data processing module in a reactive power scheduling control system, where the data processing module may be disposed in a power station controller, may also be disposed in a grid-connected inverter, and may also be used as an independent module in the reactive power scheduling control system. Referring to fig. 1, the reactive power scheduling control method disclosed in this embodiment specifically includes the following steps:
s101: entering an activation state under the condition that a reactive power control command sent by a power station controller is monitored to be in a second-level jump state;
the data processing module monitors a reactive control instruction sent by the station controller, specifically, the frequency of the numerical change of the reactive control instruction sent by the station controller is monitored in a preset period, and when the frequency of the numerical change of the reactive control instruction exceeds a preset value, the reactive control instruction sent by the station controller is judged to be in a second-level jump state, and a reactive jitter risk exists in the system.
The preset period can be 10-20 s, and can be set according to actual requirements.
S102: carrying out smooth filtering processing on numerical values in reactive control instructions sent by the power station controller;
before smooth filtering processing is carried out on numerical values in reactive control commands sent by a power station controller, a command filtering range needs to be set.
Specifically, referring to fig. 2, the method for setting the command filtering range includes the following steps:
s201: determining the median of values in all reactive control instructions sent by the station controller in a preset period as an instruction jumping point;
it can be understood that, in the case that the reactive control instruction is in the second-order jump state, the reactive control instruction jumps back and forth near the instruction jump point.
S202: and setting a command filtering range according to the command jumping point and the number of times of the numerical value change of the reactive control command sent by the power station controller in a preset period.
Firstly, identifying the type of a reactive power control instruction sent by a power station controller, and determining a reactive power regulation mode; the reactive power regulation modes comprise reactive power regulation modes such as QT, PF, Qu and Qp, the types of reactive power control instructions in different reactive power regulation modes are different, if the type of the reactive power control instruction in the QT reactive power regulation mode is the QT instruction, and the type of the reactive power control instruction in the PF reactive power regulation mode is the PF instruction.
And then, determining a filtering range factor according to the reactive power regulation mode, wherein the filtering range factors corresponding to different reactive power regulation models are different.
And finally, taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the change of the reactive control instruction value sent by the station controller in the preset period and the filtering range factor, wherein the larger the number of times of the change of the reactive control instruction value sent by the station controller in the preset period is, the larger the instruction filtering range is, and otherwise, the smaller the instruction filtering range is.
And when the numerical value in the reactive control instruction sent by the power station controller is within the instruction filtering range, performing smooth filtering processing on the numerical value in the reactive control instruction sent by the power station controller to enable the error between the numerical value in the reactive control instruction after processing and the numerical value in the reactive control instruction before processing to be within a preset precision range, and slowing down the change trend of the numerical value in the reactive control instruction.
S103: and broadcasting the processed reactive control instruction to a grid-connected inverter in the photovoltaic array.
It should be noted that, after the reactive power scheduling control system is initialized, the data processing module is in an inactive state, and enters an active state when it is monitored that a reactive power control instruction sent by the station controller is in a second-level jump state. Specifically, referring to fig. 3, the reactive power scheduling control method shown in fig. 3 specifically includes the following steps:
s301: after the reactive power dispatching control system is initialized, the data processing module is in an inactivated state;
s302: whether the data processing module is in an activated state;
if the state is not activated, execute S303: the data processing module broadcasts a reactive power control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array;
if the status is active, execute S304: the data processing module carries out smooth filtering processing on numerical values in the reactive power control commands sent by the power station controller;
s305: and the data processing module broadcasts the processed reactive control instruction to a grid-connected inverter in the photovoltaic array.
After the reactive power dispatching control system is initialized, the data processing module is in an inactivated state, and the problem that an error exists between a reactive power control instruction received by the grid-connected inverter and a reactive power control instruction sent by the power station controller due to the fact that smooth filtering processing is carried out on a numerical value in the reactive power control instruction under the condition that the reactive power control instruction is not in a second-level jump state is solved.
Once the data processing module is activated, the data processing module is in an activated state in the whole operation process of the grid-connected inverter, and the data processing module is switched from the activated state to a dormant state, namely an inactivated state, unless the grid-connected inverter is powered off.
It should be noted that, in order to improve the flexibility of the data processing module, the data processing module may also forcibly select the active state or forcibly select the sleep state.
Taking a PF reactive power regulation mode as an example, the reactive power dispatching control method comprises the following implementation steps:
1. the power station controller performs reactive scheduling on a grid-connected inverter in the photovoltaic array by broadcasting a PF reactive control instruction in a PF mode, and the data processing module is in an inactivated state and monitors the PF reactive instruction broadcasted by the power station controller in real time.
2. If the PF instruction is monitored to bounce back and forth near a certain PF value in a preset period, and the instruction bouncing frequency exceeds n times, which indicates that a reactive power jitter phenomenon (PF fluctuation) exists in the system, the data processing module enters an activation state, and the PF value is set as an instruction bouncing point.
3. And (3) setting an instruction filtering range by the data processing module in the activated state by taking the value of the instruction jumping point PF as the center, wherein the width of the instruction filtering range is determined by the jumping times n in the step (2), the larger n is, the larger the filtering range is, and otherwise, the smaller the filtering range is.
4. If the data processing module detects that the PF reactive control instruction issued by the PPC is in a filtering range, the PF reactive control instruction is subjected to smooth filtering processing, the instruction change trend is slowed down, and the resolution of the output instruction is improved.
5. When the data processing module is in an activated state, the grid-connected inverter keeps an open-loop mode in a reactive power regulation and control system of the power station, at the moment, a deviation exists between a reactive power control (PF) instruction responded by the grid-connected inverter and a reactive power control (PF) instruction actually issued by a PPC (point-to-point controller), and as the PPC masters the reactive closed-loop regulation and control right of the power station, the PF reactive power control instruction issued to the data processing module is adjusted in real time through the feedback error of the closed-loop system, the PF jitter phenomenon of a tripping point is restrained, and the reactive power dispatching control of the system meets the precision requirement.
According to the reactive power scheduling control method disclosed by the embodiment, under the condition that the power station controller detects that the system has the reactive power oscillation phenomenon, the process that the data processing module carries out smooth filtering processing on the numerical value in the reactive power control instruction generated by the power station controller is added, the variation trend of the numerical value in the reactive power control instruction received by the grid-connected inverter is slowed down, and the grid-connected inverter oscillation phenomenon caused by the numerical value jumping in the reactive power control instruction is avoided. And the reactive closed-loop control can eliminate the error between the numerical value in the reactive control instruction issued by the station controller and the numerical value in the reactive control instruction received by the grid-connected inverter, thereby improving the accuracy of the reactive scheduling control of the system.
Based on the reactive power scheduling control method disclosed in the foregoing embodiment, this embodiment correspondingly discloses a data processing module, please refer to fig. 4, where the data processing module includes:
the state activation unit 401 is configured to enter an activation state when a reactive control instruction sent by the station controller is monitored to be in a second-level hopping state;
a filtering processing unit 402, configured to perform smooth filtering processing on a numerical value in a reactive control instruction sent by the power plant controller;
and an instruction broadcasting unit 403, configured to broadcast the processed reactive control instruction to a grid-connected inverter in the photovoltaic array.
Optionally, the data processing module further includes:
and the state monitoring unit is used for monitoring the number of times of the numerical change of the reactive control instruction sent by the power station controller in a preset period, and when the number of times of the numerical change of the reactive control instruction is monitored to exceed a preset value, the reactive control instruction sent by the power station controller is judged to be in a second-level jump state.
Optionally, the data processing module further includes a filtering range setting unit;
the filtering range setting unit includes:
the instruction jumping point determining subunit is used for determining the median of numerical values in all reactive control instructions sent by the power station controller in the preset period as an instruction jumping point;
and the filtering range setting subunit is used for setting a command filtering range according to the command jumping point and the number of times of the change of the reactive control command value sent by the power station controller in the preset period.
Optionally, the filtering range setting subunit is specifically configured to identify a type of a reactive power control instruction sent by the power plant controller, and determine a reactive power regulation mode; determining a filter range factor according to the reactive power regulation mode; and taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the numerical value change of the reactive control instruction sent by the power station controller in the preset period and the filtering range factor.
Optionally, the filtering processing unit 402 is specifically configured to, when a numerical value in the reactive power control instruction sent by the power plant controller is within the instruction filtering range, perform smooth filtering processing on the numerical value in the reactive power control instruction sent by the power plant controller, so that an error between the numerical value in the reactive power control instruction after processing and the numerical value in the reactive power control instruction before processing is within a preset precision range.
Optionally, the instruction broadcasting unit 403 is further configured to broadcast the reactive control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array when the station controller is in an inactive state.
Based on the data processing module disclosed in the above embodiment, please refer to fig. 5, this embodiment correspondingly discloses a reactive power scheduling control system, which includes a power station controller, a data processing module and a grid-connected inverter;
the power station controller is used for generating a reactive power control instruction by comparing the reactive power dispatching requirement of the power grid with the reactive power feedback quantity of the grid-connected point and sending the generated reactive power control instruction to the data processing module;
the data processing module is used for the following reactive power dispatching control method:
entering an activation state under the condition that a reactive power control command sent by a power station controller is monitored to be in a second-level jump state;
carrying out smooth filtering processing on numerical values in reactive control instructions sent by the power station controller;
and broadcasting the processed reactive control instruction to a grid-connected inverter in the photovoltaic array.
Further, the method further comprises:
monitoring the number of times of the change of the reactive power control instruction value sent by the power station controller in a preset period;
and when the number of times of monitoring the numerical value change of the reactive control instruction exceeds a preset value, judging that the reactive control instruction sent by the power station controller is in a second-level jump state.
Further, the method further comprises:
determining the median of values in all reactive control instructions sent by the station controller in the preset period as an instruction jumping point;
and setting a command filtering range according to the command jumping point and the number of times of the numerical value change of the reactive control command sent by the station controller in the preset period.
Further, the setting of the instruction filtering range according to the instruction trip point and the number of times of the change of the reactive power control instruction value sent by the station controller in the preset period includes:
identifying the type of a reactive power control instruction sent by the power station controller, and determining a reactive power regulation mode;
determining a filter range factor according to the reactive power regulation mode;
and taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the numerical value change of the reactive control instruction sent by the power station controller in the preset period and the filtering range factor.
Further, the performing smooth filtering processing on the numerical value in the reactive power control instruction sent by the power station controller includes:
and when the numerical value in the reactive power control instruction sent by the power station controller is within the instruction filtering range, performing smooth filtering processing on the numerical value in the reactive power control instruction sent by the power station controller, so that the error between the numerical value in the processed reactive power control instruction and the numerical value in the reactive power control instruction before processing is within a preset precision range.
Further, the method further comprises:
and under the condition of being in an inactivated state, broadcasting a reactive power control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array.
And the grid-connected inverter is used for receiving the reactive power control instruction broadcasted by the data processing module and outputting the reactive power corresponding to the received reactive power control instruction.
The reactive power scheduling control system disclosed in this embodiment adds the data processing module, and performs smooth filtering processing on the numerical value in the reactive power control instruction generated by the station controller under the condition that the station controller detects that the system has a reactive power oscillation phenomenon, so that the variation trend of the numerical value in the reactive power control instruction received by the grid-connected inverter is slowed down, and the grid-connected inverter oscillation phenomenon caused by the numerical value jump in the reactive power control instruction is avoided.
Meanwhile, the power station controller generates a reactive power control command to perform reactive closed-loop control by comparing the reactive power scheduling requirement of the power grid with the reactive power feedback quantity of the grid-connected point, and the reactive closed-loop control can eliminate the error between the numerical value in the reactive power control command issued by the power station controller and the numerical value in the reactive power control command received by the grid-connected inverter, so that the accuracy of the reactive power scheduling control of the system is improved.
According to the reactive power dispatching control system disclosed by the embodiment, the grid-connected inverter is only used as an execution main body of a reactive power control instruction, a reactive power response state is kept, reactive power precision control is conducted by a power station controller to be regulated and controlled, and the problem that the system has unstable phenomena such as system oscillation due to the fact that a plurality of closed loops conflict with each other is avoided.
It should be noted that the data processing module may be disposed in the power plant controller, may also be disposed in the grid-connected inverter, and may also be used as an independent module in the reactive power scheduling control system, which does not affect the normal control of the grid-connected inverter.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A reactive power scheduling control method is characterized by comprising the following steps:
entering an activation state under the condition that a reactive power control command sent by a power station controller is monitored to be in a second-level jump state;
according to the instruction filtering range, carrying out smooth filtering processing on numerical values in reactive control instructions sent by the power station controller;
broadcasting the processed reactive control instruction to a grid-connected inverter in the photovoltaic array;
the method for setting the instruction filtering range comprises the following steps:
determining the median of values in all reactive control instructions sent by the station controller in a preset period as an instruction jumping point;
and setting a command filtering range according to the command jump point, the number of times of the numerical value change of the reactive control command sent by the station controller in the preset period and the reactive power regulation mode.
2. The method of claim 1, further comprising:
monitoring the number of times of the change of the reactive power control instruction value sent by the power station controller in a preset period;
and when the number of times of monitoring the numerical value change of the reactive control instruction exceeds a preset value, judging that the reactive control instruction sent by the power station controller is in a second-level jump state.
3. The method of claim 1, wherein setting a command filtering range according to the command trip point, the number of changes in the reactive control command value sent by the station controller in the preset period, and a reactive power regulation mode comprises:
identifying the type of a reactive power control instruction sent by the power station controller, and determining a reactive power regulation mode;
determining a filter range factor according to the reactive power regulation mode;
and taking the instruction jumping point as the center of the instruction filtering range, and calculating the instruction filtering range according to the number of times of the numerical value change of the reactive control instruction sent by the power station controller in the preset period and the filtering range factor.
4. The method of claim 1, wherein the smoothing and filtering the values in the reactive control commands sent by the plant controller comprises:
and when the numerical value in the reactive power control instruction sent by the power station controller is within the instruction filtering range, performing smooth filtering processing on the numerical value in the reactive power control instruction sent by the power station controller, so that the error between the numerical value in the processed reactive power control instruction and the numerical value in the reactive power control instruction before processing is within a preset precision range.
5. The method of claim 1, further comprising:
and under the condition of being in an inactivated state, broadcasting a reactive power control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array.
6. A data processing module, comprising:
the state activation unit is used for entering an activation state under the condition that a reactive power control command sent by the station controller is monitored to be in a second-level jump state;
the filtering processing unit is used for carrying out smooth filtering processing on numerical values in the reactive power control command sent by the power station controller according to the command filtering range;
the instruction broadcasting unit is used for broadcasting the processed reactive control instruction to a grid-connected inverter in the photovoltaic array;
the filtering range setting unit is used for determining the median of values in all reactive control instructions sent by the station controller in a preset period as an instruction jumping point; and setting a command filtering range according to the command jump point, the number of times of the numerical value change of the reactive control command sent by the station controller in the preset period and the reactive power regulation mode.
7. The data processing module of claim 6, further comprising:
and the state monitoring unit is used for monitoring the number of times of the numerical change of the reactive control instruction sent by the power station controller in a preset period, and when the number of times of the numerical change of the reactive control instruction is monitored to exceed a preset value, the reactive control instruction sent by the power station controller is judged to be in a second-level jump state.
8. The data processing module of claim 6, wherein the instruction broadcasting unit is further configured to broadcast the reactive control instruction sent by the station controller to a grid-connected inverter in the photovoltaic array when the instruction broadcasting unit is in an inactive state.
9. A reactive power dispatching control system is characterized by comprising a power station controller, a data processing module and a grid-connected inverter;
the power station controller is used for generating a reactive power control instruction by comparing the reactive power dispatching requirement of the power grid with the reactive power feedback quantity of the grid-connected point and sending the generated reactive power control instruction to the data processing module;
the data processing module is used for executing the reactive power dispatching control method according to any one of claims 1-5;
and the grid-connected inverter is used for receiving the reactive power control instruction broadcasted by the data processing module and outputting the reactive power corresponding to the received reactive power control instruction.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006090538A1 (en) * | 2005-02-22 | 2006-08-31 | Kyushu Institute Of Technology | System stability control method and system for electric power system |
| EP2262076B1 (en) * | 2000-02-03 | 2012-06-13 | Sumitomo Electric Industries, Ltd. | Power stabilization system and method employing a rechargeable battery system |
| CN104037785A (en) * | 2014-06-30 | 2014-09-10 | 阳光电源股份有限公司 | Dynamic reactive power compensation device and method applied to photovoltaic system |
| JP2017229110A (en) * | 2016-06-20 | 2017-12-28 | 株式会社日立製作所 | Voltage reactive power monitoring control device and method |
| CN109462242A (en) * | 2018-11-02 | 2019-03-12 | 江苏方天电力技术有限公司 | Electric system low-frequency oscillation detection method based on IIR digital filtering and ESPRIT identification algorithm |
| JP6538544B2 (en) * | 2015-12-22 | 2019-07-03 | 東芝三菱電機産業システム株式会社 | Self-excited reactive power compensator |
| WO2019130665A1 (en) * | 2017-12-27 | 2019-07-04 | 株式会社日立製作所 | Power generation system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124066C (en) * | 2000-03-02 | 2003-10-08 | 上海大唐移动通信设备有限公司 | Method for pre-processing wireless measured data in cellular mobile communication system |
| CN103023059B (en) * | 2011-09-23 | 2016-04-27 | 通用电气公司 | Energy conversion system and method for operation, photovoltaic generating system |
| CN102868167B (en) * | 2012-09-11 | 2014-11-05 | 国电南瑞南京控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
| CN104573321B (en) * | 2014-12-11 | 2017-12-08 | 国家电网公司 | A kind of identification of Gases Dissolved in Transformer Oil bad data and processing method |
| CN105226726B (en) * | 2015-05-13 | 2017-07-18 | 安徽立卓智能电网科技有限公司 | A kind of photovoltaic plant centralized monitoring system |
| CN105119297A (en) * | 2015-08-06 | 2015-12-02 | 广东明阳龙源电力电子有限公司 | Method used for adaptive reactive power compensation of photovoltaic inverter |
| CN108206525A (en) * | 2016-12-19 | 2018-06-26 | 中国电力科学研究院 | Photo-voltaic power generation station reactive compensation system and method based on inverter and the private network that communicates |
| CN107346105A (en) * | 2017-06-23 | 2017-11-14 | 上海斐讯数据通信技术有限公司 | A kind of intelligent electronic device and its control method and system and confession net equipment |
-
2019
- 2019-07-18 CN CN201910650216.5A patent/CN110247405B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2262076B1 (en) * | 2000-02-03 | 2012-06-13 | Sumitomo Electric Industries, Ltd. | Power stabilization system and method employing a rechargeable battery system |
| WO2006090538A1 (en) * | 2005-02-22 | 2006-08-31 | Kyushu Institute Of Technology | System stability control method and system for electric power system |
| CN104037785A (en) * | 2014-06-30 | 2014-09-10 | 阳光电源股份有限公司 | Dynamic reactive power compensation device and method applied to photovoltaic system |
| JP6538544B2 (en) * | 2015-12-22 | 2019-07-03 | 東芝三菱電機産業システム株式会社 | Self-excited reactive power compensator |
| JP2017229110A (en) * | 2016-06-20 | 2017-12-28 | 株式会社日立製作所 | Voltage reactive power monitoring control device and method |
| WO2019130665A1 (en) * | 2017-12-27 | 2019-07-04 | 株式会社日立製作所 | Power generation system |
| CN109462242A (en) * | 2018-11-02 | 2019-03-12 | 江苏方天电力技术有限公司 | Electric system low-frequency oscillation detection method based on IIR digital filtering and ESPRIT identification algorithm |
Non-Patent Citations (1)
| Title |
|---|
| 铁路功率调节器指令信号提取的研究与改进;江友华等;《电力电子技术》;20190330;第53卷(第3期);全文 * |
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