CN111030165A - Self-adaptive reactive power closed-loop adjusting method and system - Google Patents

Self-adaptive reactive power closed-loop adjusting method and system Download PDF

Info

Publication number
CN111030165A
CN111030165A CN201911193575.9A CN201911193575A CN111030165A CN 111030165 A CN111030165 A CN 111030165A CN 201911193575 A CN201911193575 A CN 201911193575A CN 111030165 A CN111030165 A CN 111030165A
Authority
CN
China
Prior art keywords
closed
loop
reactive
reactive power
control object
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911193575.9A
Other languages
Chinese (zh)
Other versions
CN111030165B (en
Inventor
蔡德胜
居正山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Fengdao Electric Power Automation Co ltd
Original Assignee
Nanjing Fengdao Electric Power Automation Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Fengdao Electric Power Automation Co ltd filed Critical Nanjing Fengdao Electric Power Automation Co ltd
Priority to CN201911193575.9A priority Critical patent/CN111030165B/en
Publication of CN111030165A publication Critical patent/CN111030165A/en
Application granted granted Critical
Publication of CN111030165B publication Critical patent/CN111030165B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a self-adaptive reactive power closed-loop regulation method and a system, which relate to the field of reactive power control, are used for reactive closed-loop regulation and solve the problem of how to improve the response rate of a reactive power source, and the closed-loop regulation method comprises the following steps: confirming the closed-loop progression of a control object according to the reactive power source control rate grade; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority; determining the closed-loop stage number of a control object, distributing target values of closed-loop control objects of all stages, and setting a closed-loop enable bit of the closed-loop control object of the stage; the control object performs reactive response according to the closed-loop stage number corresponding to the control object and the distributed target value, and the reactive source of the closed-loop control object performs closed-loop regulation; the closed-loop regulation system comprises: the system comprises a closed loop stage number confirming module, a closed loop enabling position setting module and a closed loop adjusting module.

Description

Self-adaptive reactive power closed-loop adjusting method and system
Technical Field
The invention relates to the field of new energy reactive power control, in particular to a self-adaptive reactive power closed-loop adjusting method and system.
Background
In the power system, in order to reduce the electric quantity loss caused by long-distance power transmission, the reactive power on-site balance is implemented, the reactive power on-site balance is divided into a power supply side, a power transformation side and a user side, and the reactive power source modes in different areas are different. For example, equipment specially used for bus reactive compensation, such as SVC (static var compensator) and SVG (scalable vector graphics), and power electronic devices, such as an inverter or a converter and the like, at the power generation side exist at the traditional new energy power supply side, so that multiple reactive power sources exist at the power supply side, the reactive response speed grades are different, the SVC and SVG response speeds are dozens of milliseconds or hundred milliseconds, and the response speed of the inverter or the converter at the power generation side reaches the second grade due to the communication bottleneck of a monitoring network; on the other hand, with the continuous penetration of new energy sources participating in frequency modulation and voltage regulation of a power grid, the communication mode of the power generation side inverter or converter is changed, so that the reactive response of the power generation side inverter or converter is shortened to tens of milliseconds, and in order to reduce the operation cost of a power station, the inverter or converter plays a role of a main reactive power source; the power supply side becomes an inverter or a converter as a main reactive power source, and reactive power sources such as SVC, SVG or a capacitor are used as auxiliary reactive power sources, so that the situations of multiple reactive power sources and multiple response rates still exist, and if automatic voltage closed-loop is carried out according to the rate of the slowest response reactive power source, the new energy power station can not meet the requirement of dynamic voltage regulation of a power grid.
In the prior art, publication No. CN102510070A discloses a method for implementing automatic closed-loop voltage control of a power plant with a power factor as a control target, which implements the following procedures: 1) analog quantity and switching value information of an electric control system of a power plant are collected through communication; 2) according to the actual power factor and the target power factor of the outgoing line of the power plant, the total reactive power required to be born by the power plant is obtained through calculation; 3) reasonably distributing the total reactive power to each generator set through calculation; 4) and (3) sending an increasing and reducing magnetic signal to an excitation system of the generator to adjust the reactive power output of the generator, so that the power factor of the outgoing line of the power plant reaches a control target value, and the voltage reactive power automatic control of multiple units in the whole plant is realized. Although the method meets the closed-loop control requirement of reactive power supply and balance required in the power plant system, the problem that the response speed of a reactive power source is slow due to multiple reactive power sources and multiple response speeds when automatic voltage closed-loop is carried out, so that a new energy power station cannot meet the dynamic voltage regulation requirement of a power grid cannot be solved, the capability of responding to the power grid by an optimal strategy when the transient voltage of the power grid drops or rises is high is not achieved, and the method is only applied to the power plant system and also has good popularization value.
Disclosure of Invention
The invention aims to solve the technical problem of how to improve the station-level response rate of the reactive power source, so that a new energy power station can meet the dynamic voltage regulation requirement of a power grid.
The invention solves the technical problems through the following technical scheme.
The embodiment of the invention provides a self-adaptive reactive power closed-loop regulation method, which comprises the following steps:
step 1: confirming the closed loop progression of a control object according to the reactive power source control rate grade of the power station; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
step 2: according to the k-th reactive response command capacity QkDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source at each level of control rate, distributing the target value of the closed-loop control object at each level, and setting the closed-loop enable bit of the closed-loop control object at the current level;
and step 3: and the control object performs reactive response according to the closed-loop stage number corresponding to the control object and the distributed target value, and the reactive source of the closed-loop control object performs closed-loop regulation.
The reactive power source control rate grade refers to that the reactive power sources are divided into three types according to the response time of each reactive power source: a reactive source with millisecond-level response rate, a reactive source with second-level response rate and a reactive source with minute-level response rate; the closed loop stage of the control object is divided into three stages: a primary closed-loop control object, a secondary closed-loop control object, and a tertiary closed-loop control object.
The reactive power sources with the same control rate grade are divided into the same closed loop grade, namely the reactive power sources with millisecond-grade response rate are divided into first-grade closed loop control objects; the reactive power source with the second-level response rate is divided into two-level closed-loop control objects; reactive sources of minute-scale response rates are divided among three-scale closed-loop control objects.
The calculation of the dominable capacity of the reactive power source with each level of control rate refers to that the sum of the reactive capacities of all millisecond-level reactive power sources in the system is calculated as millisecond-level dominable reactive capacity Qms according to the reactive power source control rate level; the sum of the reactive power source reactive capacity of all second-level response rates in the system is second-level dominable reactive capacity Qs; the sum of the reactive source reactive capacities for all minute-scale response rates in the system is the minute-scale dominable reactive capacity Qm.
The k-th reactive response command capacity QkIs according to Δ Mk-1And the system also needs reactive power regulation capacity calculated by combining the system impedance value; wherein M is a power grid target value; mk-1The grid-connected point value is the grid-connected point value after the k-1 th reactive response; Δ Mk-1The grid-connected point value M fed back after the k-1 th reactive responsek-1Difference Δ M from grid target valuek-1，ΔMk-1＝M-Mk-1(ii) a k is 1, 2,3 …; initially, k is taken to be 1, and the instruction capacity of the first reactive response is Qk＝Q1Q; and Q is the total reactive power regulation capacity, and the total reactive power regulation capacity Q is the total reactive power regulation capacity required by the system calculated by combining the system impedance value according to the power grid target value M.
The capacity Q is instructed according to the k-th reactive responsekDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source with the control rate of each level, distributing the target value of the closed-loop control object with each level, and setting the closed-loop enable bit of the closed-loop control object with the level, wherein the specific method comprises the following steps:
a) when Q iskWhen Qms is less than or equal to Qms, the control object is a primary closed-loop control object, and the target value of the primary closed-loop control object is distributed to be QkWhen the target values of the two-stage closed-loop control object and the three-stage closed-loop control object are both 0, setting oneA closed-loop enable bit of the hierarchical closed-loop control object;
b) when Q iskWhen the value is less than or equal to (Qms + Qs), the control object is a secondary closed-loop control object, the target value of the primary closed-loop control object is Qms, and the target value of the secondary closed-loop control object is (Q)k-Qms), the target value of the tertiary closed-loop control object is 0, when the closed-loop enable bit of the secondary closed-loop control object is set;
c) when Q iskWhen the value is less than or equal to (Qms + Qs + Qm), the control object is a three-level closed-loop control object, the target value of the first-level closed-loop control object is Qms, the target value of the second-level closed-loop control object is Qs, and the target value of the third-level closed-loop control object is (Q)kQms-Qs) when the closed-loop enable bit of the three-level closed-loop control object is set.
The method for carrying out closed-loop regulation on the reactive power source of the current-level closed-loop control object comprises the following steps:
1) calculating Q1Carrying out first reactive response and feeding back a grid-connected point value M1Judging the grid-connected point value M after the first feedback1Whether the current time is in a dead zone range or not, if so, closing the loop; if not, then,
2) calculating Q2Carrying out second reactive response; otherwise, sequentially carrying out;
3) calculating QkAnd carrying out the kth reactive response and feeding back a grid-connected point value MkJudging the grid-connected point value M after the kth feedbackkWhether the current time is in a dead zone range or not, if so, closing the loop; otherwise, the process continues until the closed loop ends.
The dead zone range is the fluctuation range of the power grid target value M; the interval of the dead zone range is: (M)L，MH) Wherein M isLLower limit value of fluctuation of grid target value M, MHAnd an upper limit value of the fluctuation of the grid target value M.
The grid target value M is one of a voltage value, a reactive power value and a power factor value required by a grid side.
The embodiment of the invention provides a self-adaptive reactive power closed-loop regulation system, which comprises:
the closed-loop progression confirmation module is used for confirming the closed-loop progression of a control object according to the reactive power source control rate grade of the power station; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
a closed loop enabling position setting module, wherein the closed loop enabling position setting module is used for setting the command capacity Q according to the k-th reactive responsekDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source at each level of control rate, distributing the target value of the closed-loop control object at each level, and setting the closed-loop enable bit of the closed-loop control object at the current level;
and the closed-loop regulating module is used for controlling the object to perform reactive response according to the corresponding closed-loop stage number and the distributed target value, and the reactive source of the closed-loop control object at the current stage performs closed-loop regulation.
The invention has the advantages that:
(1) according to the method, the reactive power sources in the power station are subjected to grading treatment according to the response rate, the reactive power source with the highest response rate in the power station can be controlled preferentially, and when the voltage of the power grid fluctuates greatly, the new energy power station can release the reactive capacity of the reactive power source with the highest response rate to stabilize the voltage of the power grid.
(2) The method can ensure that the control object with the unset closed-loop enable position can directly and quickly respond without participating in a slow closed-loop processing process, and shortens the reactive response time of the control object with higher response speed, thereby improving the reactive response speed of the whole power station.
(3) The system disclosed by the invention has the advantages that the reactive power of the power station responds at the fastest speed under the normal condition of the power grid, when the power grid has large transient voltage drop or rise, the reactive power of the new energy power station can also respond to the power grid in an optimal strategy, the friendliness of the new energy power station and the power grid is improved, and the popularization value is very good.
Drawings
Fig. 1 is a schematic flow chart of an adaptive reactive power closed-loop regulation method according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of an adaptive reactive power closed-loop regulation according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an adaptive reactive power closed-loop regulation system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all 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.
Example one
Fig. 1 is a schematic flow chart of an adaptive reactive power closed-loop regulation method according to a first embodiment of the present invention; as shown in fig. 1, the closed-loop adjusting method includes:
step 1: confirming the closed loop progression of a control object according to the reactive power source control rate grade of the power station; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
the reactive power source control rate grade refers to that the reactive power sources are divided into three types according to the response time of each reactive power source: a reactive source with millisecond-level response rate, a reactive source with second-level response rate and a reactive source with minute-level response rate;
the closed loop stage of the control object is divided into three stages: a primary closed-loop control object, a secondary closed-loop control object and a tertiary closed-loop control object;
the reactive power sources with the same control rate grade are divided into the same closed loop grade, namely the reactive power sources with millisecond-grade response rate are divided into first-grade closed loop control objects; the reactive power source with the second-level response rate is divided into two-level closed-loop control objects; the reactive power source with minute-level response rate is divided into three-level closed-loop control objects;
the calculation of the dominable capacity of the reactive power source with each level of control rate refers to that the sum of the reactive capacities of all millisecond-level reactive power sources in the system is calculated as millisecond-level dominable reactive capacity Qms according to the reactive power source control rate level; the sum of the reactive power source reactive capacity of all second-level response rates in the system is second-level dominable reactive capacity Qs; the sum of the reactive source reactive capacities for all minute-scale response rates in the system is the minute-scale dominable reactive capacity Qm.
Step 2: according to the k-th reactive response command capacity QkDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source at each level of control rate, distributing the target value of the closed-loop control object at each level, and setting the closed-loop enable bit of the closed-loop control object at the current level;
the k-th reactive response command capacity QkIs according to Δ Mk-1And the system also needs reactive power regulation capacity calculated by combining the system impedance value; wherein M is a power grid target value; mk-1The grid-connected point value is the grid-connected point value after the k-1 th reactive response; Δ Mk-1The grid-connected point value M fed back after the k-1 th reactive responsek-1Difference Δ M from grid target valuek-1，ΔMk-1＝M-Mk-1；k＝1，2,3…；
Initially, k is taken to be 1, and the instruction capacity of the first reactive response is Qk＝Q1Q; q is the total reactive power regulation capacity, and the total reactive power regulation capacity Q is the total reactive power regulation capacity required by the system calculated by combining the system impedance value according to the power grid target value M;
the capacity Q is instructed according to the k-th reactive responsekDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source with the control rate of each level, distributing the target value of the closed-loop control object with each level, and setting the closed-loop enable bit of the closed-loop control object with the level, wherein the specific method comprises the following steps:
a) when Q iskWhen Qms is less than or equal to Qms, the control object is a primary closed-loop control object, and the target value of the primary closed-loop control object is distributed to be QkSetting the closed-loop enable bit of the primary closed-loop control object when the target values of the secondary closed-loop control object and the tertiary closed-loop control object are both 0;
b) when Q iskWhen the value is less than or equal to (Qms + Qs), the control object is a secondary closed-loop control object, the target value of the primary closed-loop control object is Qms, and the target value of the secondary closed-loop control object is (Q)k-Qms), the target value of the tertiary closed-loop control object is 0, when the closed-loop enable bit of the secondary closed-loop control object is set;
c) when Q iskWhen the value is less than or equal to (Qms + Qs + Qm), the control object is a three-level closed-loop control object, the target value of the first-level closed-loop control object is Qms, the target value of the second-level closed-loop control object is Qs, and the target value of the third-level closed-loop control object is (Q)kQms-Qs) when the closed-loop enable bit of the three-level closed-loop control object is set.
And step 3: and the control object performs reactive response according to the closed-loop stage number corresponding to the control object and the distributed target value, and the reactive source of the closed-loop control object performs closed-loop regulation.
According to the method, the reactive power sources in the power station are subjected to grading treatment according to the response rate, the reactive power source with the highest response rate in the power station can be controlled preferentially, and when the voltage of the power grid fluctuates greatly, the new energy power station can release the reactive capacity of the reactive power source with the highest response rate to stabilize the voltage of the power grid.
Fig. 2 is a schematic diagram of a principle of adaptive reactive power closed-loop regulation according to an embodiment of the present invention, and as shown in fig. 2, the method for performing closed-loop regulation on the reactive power source of the current-stage closed-loop control object includes:
1) calculating Q1Carrying out first reactive response and feeding back a grid-connected point value M1Judging the grid-connected point value M after the first feedback1Whether the current time is in a dead zone range or not, if so, closing the loop; if not, then,
2) calculating Q2Carrying out second reactive response; otherwise, sequentially carrying out;
3) calculating QkAnd carrying out the kth reactive response and feeding back a grid-connected point value MkJudging the grid-connected point value M after the kth feedbackkWhether the current time is in a dead zone range or not, if so, closing the loop; otherwise, the process continues until the closed loop ends.
The dead zone range is the fluctuation range of the power grid target value M; the interval of the dead zone range is: (M)L，MH) Wherein M isLLower limit value of fluctuation of grid target value M, MHAnd an upper limit value of the fluctuation of the grid target value M.
The grid target value M is one of a voltage value, a reactive power value and a power factor value required by a grid side.
The method can ensure that the control object with the unset closed-loop enable position can directly and quickly respond without participating in a slow closed-loop processing process, and shortens the reactive response time of the control object with higher response speed, thereby improving the reactive response speed of the whole power station.
Example two
Fig. 3 is a schematic structural diagram of a second embodiment of the adaptive reactive power closed-loop control system according to the present invention, and as shown in fig. 3, the closed-loop control system includes: a closed loop progression validation module S31, a closed loop enable position setting module S32, and a closed loop adjustment module S33.
The closed loop stage number confirmation module S31 includes: the device comprises a rate grade dividing unit, a closed-loop grade distributing unit and a calculating unit.
The speed grade division unit divides the reactive power sources into three types according to the response time of each reactive power source: a reactive source with millisecond-level response rate, a reactive source with second-level response rate and a reactive source with minute-level response rate; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
the closed-loop stage dividing unit divides the closed-loop stage of the control object into three stages: a primary closed-loop control object, a secondary closed-loop control object and a tertiary closed-loop control object;
the closed-loop series distribution unit divides reactive power sources with the same control rate grade into the same closed-loop series, and divides reactive power sources with millisecond-level response rate into first-level closed-loop control objects; the reactive power source with the second-level response rate is divided into two-level closed-loop control objects; the reactive power source with minute-level response rate is divided into three-level closed-loop control objects;
the calculating unit calculates the disposable capacity of the reactive power source with each level of control rate, and according to the level of the reactive power source control rate, the sum of the reactive capacities of all millisecond-level reactive power sources in the system is calculated as millisecond-level disposable reactive capacity Qms; the sum of the reactive power source reactive capacity of all second-level response rates in the system is second-level dominable reactive capacity Qs; the sum of the reactive source reactive capacities for all minute-scale response rates in the system is the minute-scale dominable reactive capacity Qm.
The closed loop enable position setting module S32 includes: instruction capacity calculation unit, setting unit.
The instruction capacity calculation unit is used for calculating the kth reactive response instruction capacity QkInstruction capacity QkIs according to Δ Mk-1The reactive power regulation capacity needed by the system is calculated by combining the system impedance value; wherein M is a power grid target value; mk-1The grid-connected point value is the grid-connected point value after the k-1 th reactive response; Δ Mk-1The grid-connected point value M fed back after the k-1 th reactive responsek-1Difference Δ M from grid target valuek-1，ΔMk-1＝M-Mk-1(ii) a k is 1, 2,3 …; initially, k is taken to be 1, and the instruction capacity of the first reactive response is Qk＝Q1Q; q is the total reactive power regulation capacity, and the total reactive power regulation capacity Q is the total reactive power regulation capacity required by the system calculated by combining the system impedance value according to the power grid target value M;
the setting unit is used for setting the command capacity Q according to the k-th reactive responsekDetermining the closed-loop series of the control object in relation to the controllable capacity of the reactive power source with each level of control rate, distributing the target value of the closed-loop control object with each level, and setting the closed-loop enable bit of the closed-loop control object with the current level, and the specific methodThe following were used:
a) when Q iskWhen Qms is less than or equal to Qms, the control object is a primary closed-loop control object, and the target value of the primary closed-loop control object is distributed to be QkSetting the closed-loop enable bit of the primary closed-loop control object when the target values of the secondary closed-loop control object and the tertiary closed-loop control object are both 0;
b) when Q iskWhen the value is less than or equal to (Qms + Qs), the control object is a secondary closed-loop control object, the target value of the primary closed-loop control object is Qms, and the target value of the secondary closed-loop control object is (Q)k-Qms), the target value of the tertiary closed-loop control object is 0, when the closed-loop enable bit of the secondary closed-loop control object is set;
c) when Q iskWhen the value is less than or equal to (Qms + Qs + Qm), the control object is a three-level closed-loop control object, the target value of the first-level closed-loop control object is Qms, the target value of the second-level closed-loop control object is Qs, and the target value of the third-level closed-loop control object is (Q)kQms-Qs) when the closed-loop enable bit of the three-level closed-loop control object is set.
The closed-loop regulating module S33 is used for controlling the reactive response of the object according to the corresponding closed-loop stage number and the distributed target value, and includes a closed-loop regulating unit.
The method for performing closed-loop regulation by the closed-loop regulation unit according to the reactive power source of the closed-loop control object at the current stage comprises the following steps:
1) calculating Q1Carrying out first reactive response and feeding back a grid-connected point value M1Judging the grid-connected point value M after the first feedback1Whether the current time is in a dead zone range or not, if so, closing the loop; if not, then,
2) calculating Q2Carrying out second reactive response; otherwise, sequentially carrying out;
3) calculating QkAnd carrying out the kth reactive response and feeding back a grid-connected point value MkJudging the grid-connected point value M after the kth feedbackkWhether the current time is in a dead zone range or not, if so, closing the loop; otherwise, the process continues until the closed loop ends.
The system disclosed by the invention has the advantages that the reactive power of the power station responds at the fastest speed under the normal condition of the power grid, when the power grid has large transient voltage drop or rise, the reactive power of the new energy power station can also respond to the power grid in an optimal strategy, the friendliness of the new energy power station and the power grid is improved, and the popularization value is very good.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A self-adaptive reactive power closed-loop regulation method is characterized in that the closed-loop regulation method comprises the following steps,
step 1: confirming the closed loop progression of a control object according to the reactive power source control rate grade of the power station; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
step 2: according to the k-th reactive response command capacity QkDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source at each level of control rate, distributing the target value of the closed-loop control object at each level, and setting the closed-loop enable bit of the closed-loop control object at the current level;
and step 3: and the control object performs reactive response according to the closed-loop stage number corresponding to the control object and the distributed target value, and the reactive source of the closed-loop control object performs closed-loop regulation.
2. The adaptive reactive power closed-loop regulation method of claim 1, wherein the reactive source control rate level is that the reactive sources are classified into three categories according to the response time of each reactive source: a reactive source with millisecond-level response rate, a reactive source with second-level response rate and a reactive source with minute-level response rate; the closed loop stage of the control object is divided into three stages: a primary closed-loop control object, a secondary closed-loop control object, and a tertiary closed-loop control object.
3. The adaptive reactive power closed-loop regulation method according to claim 2, characterized in that the reactive power sources with the same control rate level are distributed in the same closed-loop series, that is, the reactive power sources with millisecond-level response rate are distributed in a primary closed-loop control object; the reactive power source with the second-level response rate is divided into two-level closed-loop control objects; reactive sources of minute-scale response rates are divided among three-scale closed-loop control objects.
4. The adaptive reactive power closed-loop regulation method of claim 3, wherein the calculation of the controllable capacity of the reactive power source with each level of control rate means that the sum of the reactive capacities of the reactive power sources with all millisecond-level response rates in the system is calculated as millisecond-level controllable reactive capacity Qms according to the reactive power source control rate level; the sum of the reactive power source reactive capacity of all second-level response rates in the system is second-level dominable reactive capacity Qs; the sum of the reactive source reactive capacities for all minute-scale response rates in the system is the minute-scale dominable reactive capacity Qm.
5. An adaptive reactive power closed-loop regulation method according to claim 4, characterized in that the kth reactive response command capacity QkIs according to Δ Mk-1And the system also needs reactive power regulation capacity calculated by combining the system impedance value; wherein M is a power grid target value; mk-1The grid-connected point value is the grid-connected point value after the k-1 th reactive response; Δ Mk-1The grid-connected point value M fed back after the k-1 th reactive responsek-1Difference Δ M from grid target valuek-1，ΔMk-1＝M-Mk-1(ii) a k is 1, 2,3 …; initially, k is taken to be 1, and the instruction capacity of the first reactive response is Qk＝Q1Q; wherein Q is reactive power regulationAnd (4) saving the total capacity, wherein the total reactive power regulation capacity Q is the total reactive power regulation capacity required by the system calculated by combining the system impedance value according to the power grid target value M.
6. An adaptive reactive power closed-loop regulation method according to claim 5, characterized in that the commanded capacity Q according to the k-th reactive response iskDetermining the closed-loop series of the control object according to the relationship with the controllable capacity of the reactive power source with the control rate of each level, distributing the target value of the closed-loop control object with each level, and setting the closed-loop enable bit of the closed-loop control object with the level, wherein the specific method comprises the following steps:
a) when Q iskWhen Qms is less than or equal to Qms, the control object is a primary closed-loop control object, and the target value of the primary closed-loop control object is distributed to be QkSetting the closed-loop enable bit of the primary closed-loop control object when the target values of the secondary closed-loop control object and the tertiary closed-loop control object are both 0;
b) when Q iskWhen the value is less than or equal to (Qms + Qs), the control object is a secondary closed-loop control object, the target value of the primary closed-loop control object is Qms, and the target value of the secondary closed-loop control object is (Q)k-Qms), the target value of the tertiary closed-loop control object is 0, when the closed-loop enable bit of the secondary closed-loop control object is set;
c) when Q iskWhen the value is less than or equal to (Qms + Qs + Qm), the control object is a three-level closed-loop control object, the target value of the first-level closed-loop control object is Qms, the target value of the second-level closed-loop control object is Qs, and the target value of the third-level closed-loop control object is (Q)kQms-Qs) when the closed-loop enable bit of the three-level closed-loop control object is set.
7. The adaptive reactive power closed-loop regulation method according to claim 6, wherein the reactive power source of the current-stage closed-loop control object is closed-loop regulated by the following method:
1) calculating Q1Carrying out first reactive response and feeding back a grid-connected point value M1Judging the grid-connected point value M after the first feedback1Whether or not to enter a dead zone range, if soThen the closed loop is finished; if not, then,
2) calculating Q2Carrying out second reactive response; otherwise, sequentially carrying out;
3) calculating QkAnd carrying out the kth reactive response and feeding back a grid-connected point value MkJudging the grid-connected point value M after the kth feedbackkWhether the current time is in a dead zone range or not, if so, closing the loop; otherwise, the process continues until the closed loop ends.
8. An adaptive reactive power closed-loop regulation method according to claim 7, characterized in that the dead zone range is a fluctuation range of the grid target value M; the interval of the dead zone range is: (M)L，MH) Wherein M isLLower limit value of fluctuation of grid target value M, MHAnd an upper limit value of the fluctuation of the grid target value M.
9. An adaptive reactive power closed-loop regulation method according to claim 8, wherein the grid target value M is one of a voltage value, a reactive power value and a power factor value required by the grid side.
10. An adaptive reactive power closed-loop regulation system, said closed-loop regulation system comprising: the closed-loop stage confirming module, the closed-loop enabling position setting module and the closed-loop adjusting module are connected with the closed-loop stage confirming module;
the closed-loop progression confirmation module is used for confirming the closed-loop progression of a control object according to the reactive power source control rate grade of the power station; the reactive power sources with the same control rate grade are divided into the same closed loop grade, and the dominable capacity of the reactive power source with the control rate of each grade is calculated; the faster the control rate of the reactive power source, the smaller the number of closed loop stages, the higher the control priority;
the closed loop enabling position setting module is used for commanding the capacity Q according to the k-th reactive power responsekDetermining closed-loop series of control objects according to the relationship with the controllable capacity of each level of control rate reactive power source, distributing target values of each level of closed-loop control objects, and setting the codebookA closed-loop enable bit of the hierarchical closed-loop control object;
the closed-loop regulating module is used for controlling the object to perform reactive response according to the closed-loop stage number corresponding to the object and the distributed target value, and the reactive power source of the closed-loop control object at the current stage performs closed-loop regulation.
CN201911193575.9A 2019-11-28 2019-11-28 Self-adaptive reactive power closed-loop adjusting method and system Active CN111030165B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911193575.9A CN111030165B (en) 2019-11-28 2019-11-28 Self-adaptive reactive power closed-loop adjusting method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911193575.9A CN111030165B (en) 2019-11-28 2019-11-28 Self-adaptive reactive power closed-loop adjusting method and system

Publications (2)

Publication Number Publication Date
CN111030165A true CN111030165A (en) 2020-04-17
CN111030165B CN111030165B (en) 2023-04-18

Family

ID=70203117

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911193575.9A Active CN111030165B (en) 2019-11-28 2019-11-28 Self-adaptive reactive power closed-loop adjusting method and system

Country Status (1)

Country Link
CN (1) CN111030165B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285497A (en) * 2021-06-15 2021-08-20 阳光电源股份有限公司 Method and device for eliminating reactive circulation of energy storage system and energy storage system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105591392A (en) * 2016-01-26 2016-05-18 沈阳工业大学 Fan reactive power optimization method for improving economic operation of wind power farm
CN107634523A (en) * 2017-09-12 2018-01-26 国电南瑞科技股份有限公司 The new energy coordinated based on multi-source classification concentrates grid entry point reactive voltage control method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105591392A (en) * 2016-01-26 2016-05-18 沈阳工业大学 Fan reactive power optimization method for improving economic operation of wind power farm
CN107634523A (en) * 2017-09-12 2018-01-26 国电南瑞科技股份有限公司 The new energy coordinated based on multi-source classification concentrates grid entry point reactive voltage control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285497A (en) * 2021-06-15 2021-08-20 阳光电源股份有限公司 Method and device for eliminating reactive circulation of energy storage system and energy storage system

Also Published As

Publication number Publication date
CN111030165B (en) 2023-04-18

Similar Documents

Publication Publication Date Title
CN105794066B (en) Multivariable controller modulator for power generating equipment
DK178459B1 (en) System og fremgangsmåde til spændingsstyring af vindgeneratorer
CN107785909B (en) Wind power plant reactive voltage coordination control method
CN107104446B (en) It is a kind of using global optimum as the power grid automatic voltage control method and system of target
CN103138269B (en) Layered and distributed network voltage regulator control system and method based on active mechanism
CN110011329B (en) Reactive power control method for low-voltage distribution area containing distributed photovoltaic
CN105914753A (en) Active distribution network (ADN) voltage real-time fuzzy control method
CN107947185B (en) A kind of power grid automatic voltage control method and system based on multiple-objection optimization
CN107171368A (en) The wind-power electricity generation primary frequency function implementation method controlled based on wind power
CN109149662A (en) A kind of more reactive sources of photovoltaic parallel in system coordinate the control method of power output
CN109103896A (en) A kind of automatic voltage control method and device
CN107230979B (en) A kind of power grid automatic voltage optimal control method
CN113131490B (en) Reactive power control method, device and system for new energy station
CN108899940A (en) A kind of second level power plant control method of AVC
CN111030165B (en) Self-adaptive reactive power closed-loop adjusting method and system
CN112087003B (en) New energy centralized frequency correction control system and control method
CN108988349A (en) Power distribution network multi-layer reactive voltage control method containing distribution type renewable energy
CN112186794A (en) Reactive power control method and device for photovoltaic power station
CN107171342B (en) A kind of control method for coordinating of discrete idle dynamic replacement continuous reactive
CN105262112A (en) Control method for wind power plant cluster-type static var compensator
CN109088418A (en) A kind of electric distribution network reactive-voltage control method based on universal model
CN110429610A (en) A kind of idle regulation method containing more DFACTS equipment power distribution system voltages
DE102019133566A1 (en) Process and stabilization controller for operating an island network
CN111030190A (en) Source-grid-load coordination control method of data-driven new energy power system
Das et al. An adaptive PQ management technique for grid voltage regulation using PV inverter

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant