CN109599897B - Reactive compensation control method considering offshore wind power volatility - Google Patents
Reactive compensation control method considering offshore wind power volatility Download PDFInfo
- Publication number
- CN109599897B CN109599897B CN201811508409.9A CN201811508409A CN109599897B CN 109599897 B CN109599897 B CN 109599897B CN 201811508409 A CN201811508409 A CN 201811508409A CN 109599897 B CN109599897 B CN 109599897B
- Authority
- CN
- China
- Prior art keywords
- node
- control
- wind power
- voltage
- reactive compensation
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000035945 sensitivity Effects 0.000 claims abstract description 28
- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Images
Classifications
-
- H02J3/386—
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention relates to a reactive compensation control method considering offshore wind power volatility. The method for controlling reactive power compensation by considering the fluctuation of an offshore wind power access system and starting from the voltage stability of the system according to the network structure and real-time system information comprises the following steps: step S1, enabling the known wind power access system to be equivalent to a double-node system through multi-port Thevenin equivalence, and calculating voltage instability indexes of all nodes in the wind power access system; step S2, judging whether the unstable index of the node voltage is out-of-limit, wherein the out-of-limit node is a key node of voltage stability, and calculating a key node control target of voltage stability; step S3, aiming at the control sensitivity of the reactive compensation control node to the voltage stability key point, selecting n nodes with high sensitivity as reactive compensation points; and step S4, calculating the corresponding control quantity of each control node by using the control sensitivity, and controlling to improve the voltage stability. The invention can perform reactive compensation control with the aim of preventing the voltage instability of the wind power access system.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a reactive compensation control method considering offshore wind power volatility.
Background
In a current wind power accessed power system, a time domain simulation method is mainly adopted to obtain a control strategy, however, the effectiveness of an offline simulation control effect depends on the accuracy of a model and the fault matching degree. For the wind power access system, the running condition and parameters of the wind power access system are continuously changed due to the wind power fluctuation, and the off-line pre-decision cannot be adapted. A control method for effectively improving voltage stability in reactive compensation control can improve the voltage stability of a system under the condition of not influencing loads. Therefore, a reactive compensation control method considering the volatility of the offshore wind power needs to be designed to improve the voltage stability of a wind power access system and prevent voltage instability, which is of great significance to a power system with the wind power permeability continuously improved.
The invention utilizes the principle of multi-port Thevenin equivalence, and calculates the sensitivity index R reflecting the degree of closeness of the key node of voltage stability in connection with the control node according to the actually measured network information and voltage amplitude of the system ji And selecting a control place through sensitivity and calculating a control quantity to obtain the reactive compensation control method for preventing voltage instability.
Disclosure of Invention
The invention aims to provide a reactive compensation control method considering offshore wind power volatility, which performs reactive compensation control aiming at preventing voltage instability of a wind power access system according to network structure and real-time system information.
In order to realize the purpose, the technical scheme of the invention is as follows: a reactive compensation control method considering offshore wind power volatility takes the volatility of an offshore wind power access system into consideration, and starts to improve the voltage stability of the system according to network structure and real-time system information so as to obtain the reactive compensation control method, and comprises the following steps:
step S1, enabling a known wind power access system to be equivalent to a double-node system through multi-port Thevenin equivalence, and calculating voltage instability indexes Ivsi of all nodes in the wind power access system;
step S2, judging whether the unstable index of the node voltage is out-of-limit, wherein the out-of-limit node is a key node of voltage stability, and calculating a key node control target of voltage stability;
step S3, aiming at the control sensitivity of the reactive compensation control node to the voltage stability key point, selecting n nodes with high sensitivity as reactive compensation points;
and step S4, calculating the corresponding control quantity of each control node by using the control sensitivity, and controlling to improve the voltage stability.
In an embodiment of the present invention, the step S1 specifically includes: the known wind power access system is equivalent to a two-node power grid by utilizing thevenin equivalent, wherein if the wind power grid-connected point still has the regulation capacity, the wind power grid-connected point is regarded as a power supply node, and if the wind power grid-connected point does not have the regulation capacity, the wind power grid-connected point is regarded as a load node; therefore, the unstable voltage index IVsi of each node is calculated.
In an embodiment of the present invention, the step S3 specifically includes: aiming at a given control node j capable of carrying out reactive compensation, calculating and reflecting a control sensitivity index between the control node j and a voltage stability key node i:
wherein Z is eqi The equivalent impedance of the system side of the node i is obtained; z is a linear or branched member LL(ij) Is the mutual impedance of node j and node i;
is the voltage phasor at which node i operates,
voltage phasor when node j is running;
based on the control sensitivity, n control points with higher sensitivity are selected.
In an embodiment of the present invention, the step S4 specifically includes: calculating target control quantity by using the node voltage instability index Ivsi, and averagely distributing the target control quantity to n reactive compensation places, wherein the control target of each control node is as follows:
wherein, I vsi,i,pre Voltage instability indicator of current dangerous node, I vsi,tar Is an index of target voltage instability;
and calculating the control quantity required by reaching the control target by using the control sensitivity of the control node j:
wherein, is Δ Q j In order to calculate the control quantity of the control node j, reactive compensation control is carried out so that the voltage instability index can reach the target requirement.
Compared with the prior art, the invention has the following beneficial effects: according to the reactive compensation control method, only the impedance information and the node voltage amplitude of the local power grid need to be obtained, and the reactive compensation control method of the offshore wind power access system can be obtained; compared with the existing method, the method is simple, quick, real-time and effective, and can fully take wind power fluctuation into account to improve the voltage stability of the wind power access system.
Drawings
Fig. 1 is a diagram of a calculation example IEEE14 node.
Fig. 2 is a two-impedance two-node grid at node i.
Fig. 3 is a flow chart of a reactive power compensation control method of the offshore wind power access system.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
The invention provides a reactive compensation control method considering offshore wind power volatility, which considers the volatility of an offshore wind power access system and starts to improve the voltage stability of the system according to network structure and real-time system information so as to obtain the reactive compensation control method, and comprises the following steps of:
step S1, enabling a known wind power access system to be equivalent to a double-node system through multi-port Thevenin equivalence, and calculating voltage instability indexes Ivsi of all nodes in the wind power access system;
step S2, judging whether the unstable index of the node voltage is out-of-limit, wherein the out-of-limit node is a key node of voltage stability, and calculating a key node control target of voltage stability;
step S3, aiming at the control sensitivity of reactive compensation control nodes to voltage stability key points, selecting n nodes with high sensitivity as reactive compensation points;
and step S4, calculating the corresponding control quantity of each control node by using the control sensitivity, and controlling to improve the voltage stability.
The step S1 specifically includes: the known wind power access system is equivalent to a two-node power grid by utilizing thevenin equivalent, wherein if the wind power grid-connected point still has the regulation capacity, the wind power grid-connected point is regarded as a power supply node, and if the wind power grid-connected point does not have the regulation capacity, the wind power grid-connected point is regarded as a load node; therefore, the unstable voltage index IVsi of each node is calculated.
The step S3 specifically includes: aiming at a given control node j capable of carrying out reactive compensation, calculating and reflecting a control sensitivity index between the control node j and a voltage stability key node i:
wherein, Z eqi The equivalent impedance of the system side of the node i is obtained; z LL(ij) Is the mutual impedance of node j and node i;
is the voltage phasor at which node i operates,
is the voltage phasor at node j when operating;
based on the control sensitivity, n control points with higher sensitivity are selected.
The step S4 specifically includes: calculating a target control quantity by using the node voltage instability index Ivsi, and averagely distributing the target control quantity to n reactive compensation places, wherein the control target of each control node is as follows:
wherein, I vsi,i,pre Voltage instability indicator of current dangerous node, I vsi,tar Is an index of target voltage instability;
and calculating the control quantity required by reaching the control target by using the control sensitivity of the control node j:
wherein, is Δ Q j In order to calculate the control quantity of the obtained control node j, reactive compensation control is carried out so that the voltage instability index can meet the target requirement.
The following is a specific implementation of the present invention.
The inventive method calculation example selects an IEEE14 node system (as shown in fig. 1). The node 8 is a wind power access node, the node 14 which can obtain the voltage instability index through calculation is a system voltage stability key node in a certain operation state, and when reactive compensation control is carried out, the control effect of a reactive compensation control place on the voltage stability key node is considered to meet the requirement of system voltage stability.
The first step is as follows: through Thevenin equivalence, a complex power grid is equivalent to a node i two-impedance two-node power grid, and a node 8 is regarded as a power supply node. The results are shown in fig. 2, and the calculated unstable voltage indexes of the nodes are shown in table 1:
TABLE 1 Voltage instability index for each node
And if the voltage of each node is judged to be in accordance with the voltage stability condition by taking the voltage Ivsi as 0.5, the voltage Ivsi of the node 14 is not in accordance with the voltage stability requirement, and reactive compensation control is carried out.
The second step is that: calculating control sensitivity R reflecting close relation between voltage stability key node and each reactive compensation control place ji The results are shown in Table 2.
TABLE 2S-index of each reactive compensation control node for node 14
The third step: and (3) taking the nodes 9 and 14 as reactive compensation nodes, and calculating the target control quantity of each control node to the voltage instability index:
the fourth step: and taking the 9 and 14 nodes as reactive compensation control places, and calculating reactive compensation control quantities of each node according to the control sensitivity of each node as follows:
control is performed by calculating the control amount, 0.3788p.u. reactive compensation is performed on the node 9, and 0.0964p.u. reactive compensation is performed on the node 14, so as to ensure the stability of the system voltage.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (1)
1. A reactive compensation control method considering offshore wind power volatility is characterized in that the volatility of an offshore wind power access system is considered, and according to a network structure and real-time system information, voltage stability of the system is improved to obtain the reactive compensation control method, and the reactive compensation control method comprises the following steps:
step S1, enabling a known wind power access system to be equivalent to a double-node system through multi-port Thevenin equivalence, and calculating voltage instability indexes Ivsi of all nodes in the wind power access system;
step S2, judging whether the unstable index of the node voltage is out-of-limit, wherein the out-of-limit node is a key node of voltage stability, and calculating a key node control target of voltage stability;
step S3, aiming at the control sensitivity of the reactive compensation control node to the voltage stability key point, selecting n nodes with high sensitivity as reactive compensation points;
step S4, calculating the corresponding control quantity of each control node by using the control sensitivity, and implementing control to improve the voltage stability;
the step S1 specifically includes: the known wind power access system is equivalent to a two-node power grid by utilizing thevenin equivalent, wherein if the wind power grid-connected point still has the regulation capacity, the wind power grid-connected point is regarded as a power supply node, and if the wind power grid-connected point does not have the regulation capacity, the wind power grid-connected point is regarded as a load node; calculating the unstable voltage index Ivsi of each node;
the step S3 specifically includes: aiming at a given control node j capable of carrying out reactive compensation, calculating and reflecting a control sensitivity index between the control node j and a voltage stability key node i:
wherein Z is eqi The equivalent impedance of the system side of the node i is obtained; z is a linear or branched member LL(ij) Is the mutual impedance of node j and node i;
is the voltage phasor at which node i operates,
voltage phasor when node j is running;
selecting n places with higher sensitivity as control places according to the control sensitivity;
the step S4 specifically includes: calculating a target control quantity by using the node voltage instability index Ivsi, and averagely distributing the target control quantity to n reactive compensation places, wherein the control target of each control node is as follows:
wherein, I vsi,pre Voltage instability indicator of current dangerous node, I vsi,tar Is an index of target voltage instability;
and calculating the control quantity required by reaching the control target by using the control sensitivity of the control node j:
wherein, is Δ Q j To calculate the control quantity of the control node j, the reactive compensation control is performed to make the voltage instability index reachTo the target requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508409.9A CN109599897B (en) | 2018-12-11 | 2018-12-11 | Reactive compensation control method considering offshore wind power volatility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811508409.9A CN109599897B (en) | 2018-12-11 | 2018-12-11 | Reactive compensation control method considering offshore wind power volatility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109599897A CN109599897A (en) | 2019-04-09 |
| CN109599897B true CN109599897B (en) | 2022-09-13 |
Family
ID=65962463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811508409.9A Expired - Fee Related CN109599897B (en) | 2018-12-11 | 2018-12-11 | Reactive compensation control method considering offshore wind power volatility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109599897B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110912164A (en) * | 2019-12-13 | 2020-03-24 | 国网福建省电力有限公司 | Green energy island energy storage capacity configuration method considering voltage stability |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769300A (en) * | 2012-07-02 | 2012-11-07 | 清华大学 | Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method |
| CN102769301A (en) * | 2012-07-02 | 2012-11-07 | 清华大学 | Voltage control method for wind farm wind turbine-side voltage in dangerous state |
| CN103124075A (en) * | 2013-03-20 | 2013-05-29 | 东南大学 | Reactive power configuration method for wind power base |
| CN104242324A (en) * | 2014-10-10 | 2014-12-24 | 东北电力大学 | Reactive compensation method applicable to areas accessed by wind power plant groups |
| CN104463698A (en) * | 2014-11-27 | 2015-03-25 | 东南大学 | Wind power system reactive compensation device action sequence determining method |
| CN104917174A (en) * | 2015-06-08 | 2015-09-16 | 北京交通大学 | Static voltage stability judgment method for active power distribution network |
| CN106356867A (en) * | 2016-09-27 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Method for determining node reactive voltage sensitivity |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013702B (en) * | 2010-11-30 | 2015-05-20 | 山东科技大学 | Dynamic equating method for grid-connected wind farm in case of external power grid failure |
| CN104361200A (en) * | 2014-10-10 | 2015-02-18 | 国家电网公司 | Sensitivity-based reactive compensation and location optimization method |
| CN105720585B (en) * | 2014-12-02 | 2018-11-20 | 国家电网公司 | The reactive power control method and system of wind power plant cluster |
| CN104953600A (en) * | 2015-07-17 | 2015-09-30 | 河南行知专利服务有限公司 | Reactive power compensation control method based on wind power integration |
| CN105186525B (en) * | 2015-10-29 | 2017-10-17 | 山东大学 | Power Network Partitioning method under wind power integration |
| CN107204634A (en) * | 2017-07-26 | 2017-09-26 | 华北电力大学 | The reactive voltage control method and system of distributing wind-powered electricity generation |
-
2018
- 2018-12-11 CN CN201811508409.9A patent/CN109599897B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769300A (en) * | 2012-07-02 | 2012-11-07 | 清华大学 | Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method |
| CN102769301A (en) * | 2012-07-02 | 2012-11-07 | 清华大学 | Voltage control method for wind farm wind turbine-side voltage in dangerous state |
| CN103124075A (en) * | 2013-03-20 | 2013-05-29 | 东南大学 | Reactive power configuration method for wind power base |
| CN104242324A (en) * | 2014-10-10 | 2014-12-24 | 东北电力大学 | Reactive compensation method applicable to areas accessed by wind power plant groups |
| CN104463698A (en) * | 2014-11-27 | 2015-03-25 | 东南大学 | Wind power system reactive compensation device action sequence determining method |
| CN104917174A (en) * | 2015-06-08 | 2015-09-16 | 北京交通大学 | Static voltage stability judgment method for active power distribution network |
| CN106356867A (en) * | 2016-09-27 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Method for determining node reactive voltage sensitivity |
Non-Patent Citations (2)
| Title |
|---|
| Optimal Allocation of Reactive Power Source in Wind Farms Using Sensitivity Analysis and Tabu Algorithm;Ping Zhang等;《2008 International Conference on Intelligent Computation Technology and Automation (ICICTA)》;20081028;1230-1234页 * |
| 基于解析灵敏度的低压切负荷优化控制方法;李卫星等;《中国电机工程学报》;20131005;第33卷(第28期);67-72页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109599897A (en) | 2019-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Alkahtani et al. | Power quality in microgrids including supraharmonics: Issues, standards, and mitigations | |
| Moafi et al. | Energy management system based on fuzzy fractional order PID controller for transient stability improvement in microgrids with energy storage | |
| Jeyaraj et al. | Development and performance analysis of PSO‐optimized sliding mode controller–based dynamic voltage restorer for power quality enhancement | |
| Xie et al. | Adaptive master-slave control strategy for medium voltage DC distribution systems based on a novel nonlinear droop controller | |
| CN110569485A (en) | new energy power supply node state vulnerability monitoring method considering new energy power supply output fluctuation | |
| Mohamed | Enhancement of power quality for load compensation using three different FACTS devices based on optimized technique | |
| CN114819693A (en) | New energy bearing capacity assessment method and device for multi-direct-current feed-in power grid | |
| CN105337290B (en) | A kind of idle method of adjustment suitable for low-frequency oscillation of electric power system aid decision | |
| Esmaeili et al. | Power quality improvement of multimicrogrid using improved custom power device called as distributed power condition controller | |
| CN110429578B (en) | Distributed direct-current micro-grid control method | |
| Hamza et al. | Impact and assessment of the overvoltage mitigation methods in low‐voltage distribution networks with excessive penetration of PV systems: A review | |
| CN109599897B (en) | Reactive compensation control method considering offshore wind power volatility | |
| Jing et al. | Research on power flow algorithm of power system with UPFC | |
| CN105958535A (en) | Distributed power supply cluster control system and control method thereof | |
| Zhao et al. | Reactive power optimization considering dynamic reactive power reserves | |
| Tapia‐Tinoco et al. | Hardware structures, control strategies, and applications of electric springs: a state‐of‐the‐art review | |
| Wang et al. | An improved adaptive droop control strategy for power sharing in micro-grid | |
| CN103618322A (en) | Dynamic reactive efficiency quantitative evaluation method oriented towards transient voltage stability | |
| Qian et al. | Optimal location and capability of FACTS devices in a power system by means of sensitivity analysis and EEAC | |
| CN114725920B (en) | Power accurate distribution method and device suitable for multi-distributed power supply virtual inertia direct current grid-connected system | |
| CN116191437A (en) | Uncertainty multi-target reactive power planning configuration method considering SVG dynamic voltage regulation capability | |
| CN109802448A (en) | A kind of renewable energy maximum consumption capacity analysis calculation method | |
| CN109586307A (en) | A kind of load shedding control method of offshore wind farm access system | |
| Wang et al. | A voltage stability control based on impedance estimation for the independent microgrid | |
| Nagesh et al. | Power flow model of static VAR compensator and enhancement of voltage stability |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220913 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |