CN109599897B  Reactive compensation control method considering offshore wind power volatility  Google Patents
Reactive compensation control method considering offshore wind power volatility Download PDFInfo
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 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
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 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 CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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 CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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
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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 realtime system information comprises the following steps: step S1, enabling the known wind power access system to be equivalent to a doublenode system through multiport 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 outoflimit, wherein the outoflimit 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 offline predecision 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 multiport 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 realtime 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 realtime 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 doublenode system through multiport 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 outoflimit, wherein the outoflimit 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 twonode power grid by utilizing thevenin equivalent, wherein if the wind power gridconnected point still has the regulation capacity, the wind power gridconnected point is regarded as a power supply node, and if the wind power gridconnected point does not have the regulation capacity, the wind power gridconnected 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, realtime 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 twoimpedance twonode 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 realtime 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 doublenode system through multiport 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 outoflimit, wherein the outoflimit 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 twonode power grid by utilizing thevenin equivalent, wherein if the wind power gridconnected point still has the regulation capacity, the wind power gridconnected point is regarded as a power supply node, and if the wind power gridconnected point does not have the regulation capacity, the wind power gridconnected 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 twoimpedance twonode 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 2Sindex 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 realtime 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 doublenode system through multiport 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 outoflimit, wherein the outoflimit 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 twonode power grid by utilizing thevenin equivalent, wherein if the wind power gridconnected point still has the regulation capacity, the wind power gridconnected point is regarded as a power supply node, and if the wind power gridconnected point does not have the regulation capacity, the wind power gridconnected 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.
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