CN112054562B - Dynamic voltage regulation capability lifting system and device for adjusting reactive power of node - Google Patents
Dynamic voltage regulation capability lifting system and device for adjusting reactive power of node Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The application discloses a dynamic voltage regulation capacity lifting system and a device for regulating reactive power of a node.
Description
Technical Field
The application relates to the field of online safety and stability calculation and analysis of power systems, in particular to a dynamic voltage regulation capacity lifting system for regulating reactive power of a node, and simultaneously relates to a dynamic voltage regulation capacity lifting device for regulating reactive power of the node.
Background
Along with the rapid growth of the direct current transmission scale, the rapid development of new energy sources such as wind power, photovoltaic and the like, the power supply and power grid patterns in China continuously change greatly, and the safe operation of the power grid and the large-scale consumption of renewable energy sources face brand new challenges. On one hand, the characteristics of the electric network continuously change in the high-speed development period of the ultra-high voltage electric network in China, the current coupling of the alternating current, direct current and transmitting and receiving ends of the electric network is gradually compact, the influence of faults on the operation of the electric network is changed from local to global, the problem of dynamic voltage stability of the electric network is increasingly prominent due to large-scale production of new energy and direct current power transmission, the stability category of the electric network is further expanded, the electric power electronic characteristics are prominent, and the voltage regulating capability of the electric network is continuously reduced. On the other hand, new energy in China continuously and rapidly grows in recent years, the ratio of the new energy in a power grid is increasingly improved, and as new energy output such as wind, light and the like has randomness and fluctuation, and the frequency and voltage regulation characteristics of the new energy output are different from those of a conventional generator set, the voltage regulation capability and the disturbance rejection capability of the system are deteriorated to a certain extent, and meanwhile, the new energy is influenced due to the problem of insufficient voltage supporting capability of the power grid.
Under the background that the current total network output components and the absorption modes are deeply changed, the voltage characteristics of the power grid are radically changed, and the quasi-static voltage balance problem is evolved into the problem that the voltage regulation capacity of the weak area is reduced and the disturbance rejection capacity is insufficient. The existing dispatching control system module lacks the function and application of accurately evaluating and optimizing the dynamic voltage regulating capability of the power grid, so that research on a dynamic voltage regulating capability evaluating method based on online data and a layered and partitioned multi-target coordinated optimization lifting technology are needed, an online power grid dynamic voltage regulating capability evaluating and optimizing lifting architecture scheme and functional software are finally formed, the dispatching control system module is applied to a dispatching control center, and decision support is provided for power grid dispatching operators to lift the safety level and voltage regulating capability of the power grid and continue to lift new energy absorbing capability.
Disclosure of Invention
In order to solve the problem of the requirement on a dynamic voltage regulation capability assessment and lifting method, the application provides a dynamic voltage regulation capability lifting system for adjusting reactive power of a node, which comprises the following steps:
determining weak nodes of dynamic pressure regulating capability;
the sensitivity of reactive power adjustment of each generator and the switching of each capacitive reactance to the weak node voltage is calculated respectively, and then generator nodes and capacitive reactance nodes which are effective to the weak node voltage are screened out;
for the effective generator node and the capacitive reactance node, respectively calculating the track sensitivity of reactive power adjustment and capacitive reactance state adjustment of the generator to the dynamic voltage regulation capability of the weak node;
reactive power adjustment is carried out on the effective generator node and the capacitive reactance node according to the track sensitivity, and the voltage adjustment of the weak node is completed according to a control target of a predetermined voltage drop area;
and (3) checking the adjustment measure of the voltage of the weak node, and adjusting the reactive power and/or the capacitive reactance state of the weak node generator again or finishing the adjustment according to the checking result to finish the improvement of the dynamic voltage regulating capability of the system.
Further, determining a weak node of dynamic voltage regulation capability includes:
obtaining the voltage of each node in the simulation process through transient time domain simulation;
acquiring the integral area, duration and minimum voltage of each node with the voltage lower than a preset threshold value;
acquiring a node set meeting a criterion condition according to the integral area, the duration and the minimum voltage;
and taking the node with the largest voltage drop surface in the node set as a weak node of dynamic high-voltage capability.
Further, the sensitivity of each generator to the weak node voltage of reactive power adjustment and each capacitive reactance switching is calculated respectively, and then generator nodes and capacitive reactance nodes effective to the weak node voltage are screened out, including:
calculating the sensitivity of each generator to the weak node voltage by adjusting reactive power;
calculating the voltage drop of the generator node caused by the weak node short circuit fault;
according to a preset sensitivity threshold and a voltage drop threshold, screening out generator nodes which are effective to the weak node voltage;
calculating the sensitivity of the switching of each capacitive reactance to the voltage of the weak node;
calculating voltage drop of a capacitive reactance node caused by weak node short circuit fault;
and screening out capacitive reactance nodes which are effective to the weak node voltage according to a preset sensitivity threshold and a voltage drop threshold.
Further, according to the preset sensitivity threshold and voltage drop threshold, the generator node which is effective to the weak node voltage is screened out,
screening out a generator set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop larger than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold;
and screening out the generators which have supporting capability on the weak node voltage and cause voltage drop due to weak node faults from the generator set, wherein the generators are generators effective on the weak node voltage.
Further, screening the capacitive reactance node effective to the weak node voltage according to a preset sensitivity threshold and a voltage drop threshold, including:
screening a capacitive reactance set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop smaller than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold; and screening out the capacitive reactance devices which have supporting capability on the weak node voltage and cannot cause voltage drop due to the weak node fault from the capacitive reactance device set, wherein the capacitive reactance devices are capacitive reactance devices which are effective on the weak node voltage.
Further, respectively calculating the track sensitivity of the reactive power adjustment and the capacitive reactance state adjustment of the generator to the dynamic voltage regulation capability of the weak node, including:
the reactive power of each generator in the generator set is adjusted to the maximum reactive power;
obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n The reduction value is used as the reactive power of the generator to adjust the track sensitivity to the weak node voltage;
acquiring the real-time state of each capacitive reactance in the capacitive reactance collective, carrying out operation of returning the capacitive reactance with the real-time state being operational, and carrying out operation of returning the capacitive reactance with the real-time state being operational;
acquiring an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n And taking the reduction value as the reactive power of the capacitive reactance to adjust the track sensitivity to the weak node voltage.
Further, reactive power adjustment is performed on the effective generator node and the capacitive reactance node according to the track sensitivity, and weak node voltage adjustment is completed according to a predetermined control target of the voltage drop area, including:
respectively incorporating the effective generator nodes and the capacitive reactance nodes into a generator control set UnSet according to a preset track sensitivity threshold value C Or capacitive reactance control set CSet C ；
For UnSet C And CSet C Reactive power sum of generators in (b)Or the state of the capacitive reactance is adjusted; calculating an accumulated contribution value of voltage drop area of the weak node by adjusting;
when the voltage drop area Vdrop of weak node i 0 Control target Vdrop with preset voltage drop area i tgv And when the difference value of the voltage difference value is smaller than or equal to the accumulated contribution value, finishing the adjustment of the weak node voltage.
Further, according to a preset track sensitivity threshold, respectively incorporating the effective generator node and the capacitive reactance node into a generator control set UnSet C Or capacitive reactance control set CSet C Comprising:
comparing the track sensitivity of the effective generator node and the capacitive reactance node with a preset track sensitivity threshold;
the nodes with the track sensitivity larger than the preset track sensitivity threshold value are included in a generator control set UnSet C Or capacitive reactance control set CSet C 。
Further, according to the verification result, the reactive power and/or the capacitive reactance state of the weak node generator are adjusted again or are adjusted to be finished, including:
if the verification result meets the control target Vdrop i tgv And finishing the adjustment, otherwise, readjusting.
For a generator control set UnSet C Or capacitive reactance control set CSet C And carrying out load flow calculation, and checking the adjustment measure of the weak node voltage through transient time domain simulation.
And (3) according to the verification result, the reactive power and/or the capacitive reactance state of the weak node generator are adjusted again or are adjusted to be finished.
The application also provides a dynamic voltage regulation capacity lifting device for regulating the reactive power of the node, which comprises the following components:
the weak node determining unit is used for determining weak nodes with dynamic voltage regulation capability;
the effective node screening unit is used for respectively calculating the reactive power of each generator and the sensitivity of each capacitive reactance switching on and off to the weak node voltage, and further screening out generator nodes and capacitive reactance nodes which are effective to the weak node voltage;
the track sensitivity calculation unit is used for calculating the track sensitivity of reactive power adjustment of each generator and the capacitive reactance device to the effective generator node and the capacitive reactance device node for improving the dynamic voltage regulation capability of the weak node;
and the adjusting unit is used for adjusting reactive power of the effective generator node and the capacitive reactance node according to the track sensitivity and finishing the adjustment of the voltage of the weak node according to a control target of a predetermined voltage drop area.
Drawings
FIG. 1 is a schematic flow diagram of a dynamic voltage regulation capability enhancing system for adjusting reactive power of a node according to the present application;
FIG. 2 is a flow chart of a dynamic voltage regulation capability boost provided by the application for regulating reactive power of a node;
fig. 3 is a schematic diagram of a dynamic voltage regulation capability lifting device for regulating reactive power of a node according to the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present application may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present application is not limited to the specific embodiments disclosed below.
The method provided by the application is described in detail below with reference to a schematic flow chart of a dynamic voltage regulation capability lifting system for regulating reactive power of a node provided in fig. 1.
Step S101, determining weak nodes of dynamic voltage regulation capability.
By performing transient time domain simulation on the expected faults, tracking the voltage condition of each node in the simulation process, calculating the integration area Vdrop, the duration Tlow and the minimum voltage Vmin of each node voltage lower than a preset threshold value, and searching out weak nodes with dynamic voltage regulation capability meeting the criterion condition.
For node iFor the voltage Vj (interval Δt between two points is 0.01 s) at each time in the simulation process (the typical simulation duration is 20 s), the integral area Vdrop of the voltage below the set threshold (typically taking 0.9 per unit value) is calculated as follows i Duration Tlow i And a minimum voltage Vmin i 。
Vmin i ＝min(V ij ),t 1 ≤j≤20
T is in 1 And the voltage in the process of predicting the occurrence of the fault and recovering the voltage after the fault is cleared is analyzed for the next moment after the fault is cleared, namely, the voltage in the process of recovering the voltage after the fault is expected to occur is analyzed.
Setting the minimum voltage threshold value to 0.8, and setting the duration Tlow i Threshold value is 10s, and Vmin is searched out i Less than 0.8 and Tlow i Node set VSet greater than 10 s.
For nodes in the set VSet, according to Vdrop i And sorting, namely finding out the node with the largest voltage drop area, namely the node with the weakest dynamic voltage regulating capability.
Step S102, the sensitivity of each generator to the weak node voltage, which is adjusted by reactive power and the switching of each capacitive reactance, is calculated respectively, and then generator nodes and capacitive reactance nodes which are effective to the weak node voltage are screened out.
Aiming at the weak node, calculating the sensitivity of each generator to the voltage of the weak node by adjusting reactive power; calculating the voltage drop of the generator node caused by the weak node short circuit fault; according to a preset sensitivity threshold and a voltage drop threshold, screening out generator nodes which are effective to the weak node voltage; calculating the sensitivity of the switching of each capacitive reactance to the voltage of the weak node; calculating voltage drop of a capacitive reactance node caused by weak node short circuit fault; and screening out capacitive reactance nodes which are effective to the weak node voltage according to a preset sensitivity threshold and a voltage drop threshold.
Screening out a generator set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop larger than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold; and screening out the generators which have supporting capability on the weak node voltage and cause voltage drop due to weak node faults from the generator set, wherein the generators are generators effective on the weak node voltage.
a) For the weak node i, the sensitivity of reactive power adjustment of each generator m to the voltage of the node i is calculated one by one, and the calculation formula is as follows.
ΔU i ＝R DG ΔQ m
Wherein D is a voltage weak node, G is a generator node, L matrix is a matrix established by the imaginary part of the power flow calculation admittance matrix, and RDG is a partial submatrix related to the weak node i and the generator node by inverse neutralization of the L matrix.
b) Calculating voltage drop delta U of each generator node m caused by weak node i short circuit fault m The calculation formula is as follows.
U in i(0) Is the voltage before the short-circuit fault of the node i, Z eq i Is the Thevenin equivalent impedance looking into the system from node i, Z m-i Is the transimpedance between node i and generator node m.
c) Setting the threshold value of reactive power adjustment of the generator to the voltage sensitivity of the weak node to be 0.05, setting the threshold value of voltage drop of the generator node caused by the short circuit fault of the weak node to be 0.2, screening out a generator set UnSet with the voltage sensitivity being larger than 0.05 and the voltage drop being larger than 0.2, namely finding out a generator which has supporting capability on the voltage of the weak node and can sense the voltage drop caused by the fault of the weak node, and taking the generator as the generator effective on the voltage of the weak node.
Screening a capacitive reactance set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop smaller than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold; and screening out the capacitive reactance devices which have supporting capability on the weak node voltage and cannot cause voltage drop due to the weak node fault from the capacitive reactance device set, wherein the capacitive reactance devices are capacitive reactance devices which are effective on the weak node voltage.
d) Aiming at the weak node i, firstly, the switching operation of each capacitive reactance m is judged one by one.
And if the reactance value of the capacitive reactance m is smaller than 0 and is in a return operation state, performing operation on the capacitive reactance m.
If the reactance value of the capacitive reactance m is less than 0 and is in a put-to-operate state, the capacitive reactance m is skipped.
And if the reactance value of the capacitive reactance m is greater than 0 and is in a running state, carrying out a shutdown operation on the capacitive reactance m.
If the reactance value of the capacitive reactance m is greater than 0 and is in a retired state, the capacitive reactance m is skipped.
And then calculating the sensitivity of the capacitive reactance m on and off (namely, adjusting reactive power) to the voltage of the node i, and calculating according to the formula of the step a).
Then, voltage drop delta U of each capacitive reactance node m caused by short circuit fault of weak node i is calculated m According to the formula of step b).
Setting the threshold value of reactive power adjustment of the capacitive reactance device on the voltage sensitivity of the weak node to be 0.05, setting the threshold value of voltage drop of the capacitive reactance device caused by the short circuit fault of the weak node to be 0.2, screening out a generator set CSet with the voltage sensitivity being more than 0.05 and the voltage drop being less than 0.2, namely finding out the capacitive reactance device which has supporting capability on the voltage of the weak node and cannot cause the voltage of the weak node to drop greatly when the weak node fault occurs, and taking the capacitive reactance device as the capacitive reactance device which is effective on the voltage of the weak node.
Step S103, for the effective generator node and the capacitive reactance node, track sensitivity of reactive power adjustment and capacitive reactance state adjustment of the generator to dynamic voltage regulation capacity of the weak node is respectively calculated.
And aiming at the weak node i, the effective generator set UnSet and the effective capacitor reactor set CnSet, calculating the track sensitivity of reactive power adjustment of each generator and reactive power adjustment of the capacitor reactor in the set on the dynamic voltage regulation capability of the weak node i one by one.
The reactive power of each generator in the generator set is adjusted to the maximum reactive power; obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n And adjusting the trace sensitivity to the weak node voltage by taking the reduction value as the reactive power of the generator.
a) For a generator n in a generator set UnSet, acquiring real-time reactive power Qu of the generator n n Maximum reactive power Qmax n The reactive power of the generator n is increased to a maximum reactive power.
b) Carrying out load flow calculation on the adjusted data, then carrying out transient time domain simulation of the expected faults, tracking the voltage condition of the weak node i in the simulation process, and calculating the integral area Vdrop of the node voltage i lower than a set threshold value i 1 And the obtained voltage drop area Vdrop of the weak node i i 0 In comparison, a reduced value dVdrop of the voltage drop area of the weak node i is obtained i n The track sensitivity to the voltage of the weak node i is adjusted as generator n reactive power.
Acquiring the real-time state of each capacitive reactance in the capacitive reactance collective, carrying out operation of returning the capacitive reactance with the real-time state being operational, and carrying out operation of returning the capacitive reactance with the real-time state being operational; acquiring an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain weak node electricityReduction of the pressure drop area dVdrop i n And taking the reduction value as the reactive power of the capacitive reactance to adjust the track sensitivity to the weak node voltage.
c) And aiming at the capacitive reactance k in the capacitive reactance set CSet, acquiring the real-time state of the capacitive reactance k, if the capacitive reactance is in the operational state at present, carrying out the operational operation on the capacitive reactance, and if the capacitive reactance is in the operational state at present, carrying out the operational operation on the capacitive reactance.
d) Carrying out load flow calculation on the adjusted data, then carrying out transient time domain simulation of the expected faults, tracking the voltage condition of the weak node i in the simulation process, and calculating the integral area Vdrop of the node voltage i lower than a set threshold value i 1 And the obtained voltage drop area Vdrop of the weak node i i 0 In comparison, a reduced value dVdrop of the voltage drop area of the weak node i is obtained i k The reactive power of the capacitive reactance k is used for adjusting the track sensitivity to the voltage of the weak node i.
And step S104, reactive power adjustment is carried out on the effective generator node and the capacitive reactance node according to the track sensitivity, and the adjustment of the voltage of the weak node is completed according to a control target of a predetermined voltage drop area.
And aiming at the weak node i, determining a node voltage lifting measure according to a control target value of a predetermined voltage drop area.
Sequencing track sensitivity from large to small, preferentially adjusting generators or capacitive reactance with large track sensitivity, and respectively incorporating effective generator nodes and capacitive reactance nodes into a generator control set UnSet according to a preset track sensitivity threshold value C Or capacitive reactance control set CSet C Comparing the track sensitivity of the effective generator node and the capacitive reactance node with a preset track sensitivity threshold, and incorporating the nodes with the track sensitivity larger than the preset track sensitivity threshold into a generator control set UnSet C Or capacitive reactance control set CSet C 。
For UnSet C And CSet C Reactive power and/or state of capacitive reactance of the generatorThe method comprises the steps of carrying out a first treatment on the surface of the Calculating an accumulated contribution value of voltage drop area of the weak node by adjusting; when the voltage drop area Vdrop of weak node i 0 Control target Vdrop with preset voltage drop area i tgv And stopping when the difference value of the voltage of the weak node is smaller than or equal to the accumulated contribution value, namely, when the following formula is satisfied, and finishing the adjustment of the voltage of the weak node.
Step S105, through checking the adjustment measures of the voltage of the weak node, the reactive power and/or the capacitive reactance state of the weak node generator are adjusted again or are adjusted completely according to the checking result, and the dynamic voltage regulating capability of the system is improved.
If the verification result meets the control target Vdrop i tgv And finishing the adjustment, otherwise, readjusting. For a generator control set UnSet C Or capacitive reactance control set CSet C And carrying out load flow calculation, and checking the adjustment measure of the weak node voltage through transient time domain simulation. And (3) according to the verification result, the reactive power and/or the capacitive reactance state of the weak node generator are adjusted again or are adjusted to be finished.
Specifically, the power flow adjustment is carried out on the determined generator adjustment set, the transient time domain simulation verification is carried out, and the calculation or readjustment of the control measures is finished according to the verification result.
a) For the generator set UnSet C The reactive power of the generator is adjusted in accordance with step S103).
b) Set Cset for capacitive reactance C The capacitor reactance device is put into operation or put out of operation according to the mode of the step S103).
c) Carrying out load flow calculation on the adjusted data, carrying out transient time domain simulation of the expected faults in the step S101), tracking the voltage condition of the weak node i in the simulation process, and calculating the integral area Vdrop of the node voltage i lower than a set threshold value i 1 If Vdrop i 1 Less than or equal to the targetValue Vdrop i tgv If the control target is reached, stopping calculation, and UnSet C ，Cset C Namely a control generator set and a control capacitive reactance set.
If Vdrop i 1 Greater than the target value Vdrop i tgv Returning to step S104), continuing to add the generator control measures and the capacitive reactance control measures, namely adding a new generator to the generator set UnSet C Adding a new capacitive reactance to the capacitive reactance control set CSet C Until step S105) judges that the control target is reached.
The dynamic voltage regulation capability improvement flow for adjusting the reactive power of the node, as shown in fig. 2, can be summarized as the following steps:
1) Determining a dynamic voltage regulating capacity weak node;
2) Searching a capacitive reactance node and a generator node which are effective to weak node voltage;
3) Calculating the track sensitivity of the reactive power adjustment of the node to the weak node voltage;
4) Determining node voltage lifting measures for the capacitive reactance nodes and the generator nodes;
5) Checking the effect after adjustment, adjusting the control measure or ending the calculation.
Based on the same inventive concept, the present application also provides a dynamic voltage regulation capability improving device 300 for adjusting reactive power of a node, as shown in fig. 3, including:
a weak node determining unit 310 determining weak nodes of dynamic voltage regulation capability;
an effective node screening unit 320, which calculates the reactive power of each generator and the sensitivity of each capacitive reactance to the weak node voltage, so as to screen out the generator node and capacitive reactance node effective to the weak node voltage;
the track sensitivity calculation unit 330 calculates the track sensitivity of reactive power adjustment of each generator and capacitive reactance for the effective generator node and capacitive reactance node to improve the dynamic voltage regulation capability of the weak node;
the adjusting unit 340 adjusts reactive power of the effective generator node and the capacitive reactance node according to the track sensitivity, and completes the adjustment of the weak node voltage according to a control target of a predetermined voltage drop area;
and the lifting unit 350 performs adjustment or finishing adjustment on the reactive power and/or the capacitive reactance state of the weak node generator according to the verification result by verifying the adjustment measure of the weak node voltage, so as to complete the lifting of the dynamic voltage regulating capability of the system.
The application provides a dynamic voltage regulating capability improving system and a device for regulating reactive power of a node. And the dynamic voltage regulating capability of the weak node is improved through reactive power regulation and capacitive reactance state regulation of the generator. The method solves the problem of the requirement on the dynamic voltage regulation capability assessment and lifting method, and simultaneously improves the extra-high voltage direct current voltage supporting capability, thereby laying a foundation for improving the new energy consumption level on the basis of the power grid safety.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present application without departing from the spirit and scope of the present application, and all modifications and equivalents are intended to be included in the scope of the claims of the present application.
Claims (7)
1. A dynamic voltage regulation capability boost system for regulating reactive power of a node, comprising:
determining weak nodes of dynamic pressure regulating capability;
the sensitivity of reactive power adjustment of each generator and the switching of each capacitive reactance to weak node voltage is calculated respectively, and then generator nodes and capacitive reactance nodes which are effective to the weak node voltage are screened out, and the method comprises the following steps:
the reactive power of each generator in the generator set is adjusted to the maximum reactive power;
obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n The reduction value is used as the reactive power of the generator to adjust the track sensitivity to the weak node voltage;
acquiring the real-time state of each capacitive reactance in the capacitive reactance collective, carrying out operation of returning the capacitive reactance with the real-time state being operational, and carrying out operation of returning the capacitive reactance with the real-time state being operational;
obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n The reduction value is used as reactive power of the capacitive reactance to adjust the track sensitivity to the weak node voltage;
screening out a generator set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop larger than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold;
screening out generators which have supporting capability on the weak node voltage and cause voltage drop due to weak node faults from the generator set, wherein the generators are generators effective on the weak node voltage;
screening a capacitive reactance set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop smaller than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold; screening out capacitive reactance devices which have supporting capability on the voltage of the weak node and cannot cause voltage drop due to the fault of the weak node from the capacitive reactance device set, wherein the capacitive reactance devices are capacitive reactance devices which are effective on the voltage of the weak node;
for the effective generator node and the capacitive reactance node, respectively calculating the track sensitivity of reactive power adjustment and capacitive reactance state adjustment of the generator to the dynamic voltage regulation capability of the weak node;
reactive power adjustment is carried out on the effective generator node and the capacitive reactance node according to the track sensitivity, and the voltage adjustment of the weak node is completed according to a control target of a predetermined voltage drop area;
and (3) checking the adjustment measure of the voltage of the weak node, and adjusting the reactive power and/or the capacitive reactance state of the weak node generator again or finishing the adjustment according to the checking result to finish the improvement of the dynamic voltage regulating capability of the system.
2. The system of claim 1, wherein determining a weak node for dynamic pressure regulation capability comprises:
obtaining the voltage of each node in the simulation process through transient time domain simulation;
acquiring the integral area, duration and minimum voltage of each node with the voltage lower than a preset threshold value;
acquiring a node set meeting a criterion condition according to the integral area, the duration and the minimum voltage;
and taking the node with the largest voltage drop surface in the node set as a weak node of dynamic high-voltage capability.
3. The system of claim 1, wherein the calculating of the sensitivity of each generator to reactive power and each capacitive reactance switching to weak node voltage to screen out generator nodes and capacitive reactance nodes that are active on the weak node voltage comprises:
calculating the sensitivity of each generator to the weak node voltage by adjusting reactive power;
calculating the voltage drop of the generator node caused by the weak node short circuit fault;
according to a preset sensitivity threshold and a voltage drop threshold, screening out generator nodes which are effective to the weak node voltage;
calculating the sensitivity of the switching of each capacitive reactance to the voltage of the weak node;
calculating voltage drop of a capacitive reactance node caused by weak node short circuit fault;
and screening out capacitive reactance nodes which are effective to the weak node voltage according to a preset sensitivity threshold and a voltage drop threshold.
4. The system of claim 1, wherein the reactive power adjustment of the active generator node and capacitive reactance node based on the trajectory sensitivity, the weak node voltage adjustment being accomplished based on a predetermined voltage sag area control objective, comprises:
respectively incorporating the effective generator nodes and the capacitive reactance nodes into a generator control set UnSet according to a preset track sensitivity threshold value C Or capacitive reactance control set CSet C ；
For UnSet C And CSet C The reactive power and/or the state of the capacitive reactance of the generator are adjusted; calculating an accumulated contribution value of voltage drop area of the weak node by adjusting;
when the voltage drop area Vdrop of weak node i 0 Control target Vdrop with preset voltage drop area i tgv And when the difference value of the voltage difference value is smaller than or equal to the accumulated contribution value, finishing the adjustment of the weak node voltage.
5. The system of claim 4 wherein the active generator nodes and capacitive reactance nodes are respectively incorporated into the generator control set UnSet according to a preset trajectory sensitivity threshold C Or capacitive reactance control set CSet C Comprising:
comparing the track sensitivity of the effective generator node and the capacitive reactance node with a preset track sensitivity threshold;
sensitivity of the trajectoryNodes greater than a preset trace sensitivity threshold, incorporating a generator control set UnSet C Or capacitive reactance control set CSet C 。
6. The system of claim 1, wherein readjusting or ending the adjustment of the weak node generator reactive power and/or capacitive reactance status based on the verification result comprises:
if the verification result meets the control target Vdrop i tgv Ending the adjustment, otherwise, adjusting again;
for a generator control set UnSet C Or capacitive reactance control set CSet C Carrying out load flow calculation, and checking the adjustment measure of the weak node voltage through transient time domain simulation;
and (3) according to the verification result, the reactive power and/or the capacitive reactance state of the weak node generator are adjusted again or are adjusted to be finished.
7. A dynamic voltage regulation capability lifting device for adjusting reactive power of a node, comprising:
the weak node determining unit is used for determining weak nodes with dynamic voltage regulation capability;
the effective node screening unit calculates the sensitivity of each generator to the weak node voltage of reactive power adjustment and each capacitive reactance switching, and then screens out the effective generator node and capacitive reactance node of weak node voltage, including:
the reactive power of each generator in the generator set is adjusted to the maximum reactive power;
obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n The reduction value is used as the reactive power of the generator to adjust the track sensitivity to the weak node voltage;
acquiring the real-time state of each capacitive reactance in the capacitive reactance collective, carrying out operation of returning the capacitive reactance with the real-time state being operational, and carrying out operation of returning the capacitive reactance with the real-time state being operational;
obtaining an integral area Vdrop of weak node voltage lower than a preset threshold value through transient time domain simulation i 1 The integration area and the weak node voltage drop area Vdrop i 0 Comparing to obtain a reduced value dVdrop of the voltage drop area of the weak node i n The reduction value is used as reactive power of the capacitive reactance to adjust the track sensitivity to the weak node voltage;
screening out a generator set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop larger than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold;
screening out generators which have supporting capability on the weak node voltage and cause voltage drop due to weak node faults from the generator set, wherein the generators are generators effective on the weak node voltage;
screening a capacitive reactance set with voltage sensitivity larger than a preset sensitivity threshold and voltage drop smaller than the voltage drop threshold according to the preset sensitivity threshold and the voltage drop threshold; screening out capacitive reactance devices which have supporting capability on the voltage of the weak node and cannot cause voltage drop due to the fault of the weak node from the capacitive reactance device set, wherein the capacitive reactance devices are capacitive reactance devices which are effective on the voltage of the weak node;
the track sensitivity calculation unit is used for calculating the track sensitivity of reactive power adjustment of each generator and the capacitive reactance device to the effective generator node and the capacitive reactance device node for improving the dynamic voltage regulation capability of the weak node;
and the adjusting unit is used for adjusting reactive power of the effective generator node and the capacitive reactance node according to the track sensitivity and finishing the adjustment of the voltage of the weak node according to a control target of a predetermined voltage drop area.
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| CN106230024A (en) * | 2016-08-22 | 2016-12-14 | 张雪敏 | Power system power failure Risk Calculation method containing double-fed fan motor field |
| CN110165660A (en) * | 2019-04-26 | 2019-08-23 | 国电南瑞科技股份有限公司 | A kind of receiving end power grid transient voltage prevention and control optimization method and its system |
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| CN106230024A (en) * | 2016-08-22 | 2016-12-14 | 张雪敏 | Power system power failure Risk Calculation method containing double-fed fan motor field |
| CN110165660A (en) * | 2019-04-26 | 2019-08-23 | 国电南瑞科技股份有限公司 | A kind of receiving end power grid transient voltage prevention and control optimization method and its system |
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