CN107179706B - UHVDC model suitable for receiving-end large power grid simulation analysis and modeling method - Google Patents
UHVDC model suitable for receiving-end large power grid simulation analysis and modeling method Download PDFInfo
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Abstract
The invention discloses a UHVDC (ultra high Voltage direct Current) practical model modeling method suitable for receiving-end large power grid simulation analysis, and belongs to the field of power system modeling. The invention simplifies the model structure aiming at the composition and operation control principle of the receiving-end extra-high voltage direct current inverter station. The model can be decomposed into a plurality of local modules, including a valve group module, a converter transformer module, a reactive compensation equipment module and a controller module. In addition, according to the role of the converter transformer in the interaction effect of the alternating current and direct current system, the converter transformer module is decoupled into two independent modules, one is used for describing the effect of the converter transformer module on the output power, and the other is used for describing the effect of the converter transformer module on the input commutation voltage. The controllers of the model are preset by typical operation control processes respectively, and corresponding modeling work can be further simplified. The model can better reflect the disturbed output power characteristics and can be conveniently used for the electromechanical process simulation of the off-line power system in the preset mode.
Description
Technical Field
The invention belongs to the technical field of power system modeling, and particularly relates to a UHVDC practical model and a modeling method thereof.
Background
The ultra-high voltage direct current transmission has large capacity of electric energy, and simultaneously has the advantages of low transmission loss, flexible transmission power adjustment, high transmission reliability and the like, so the ultra-high voltage direct current transmission is widely applied to the aspects of long-distance and large-area power grid interconnection, large-capacity transmission and the like. The UHVDC (ultra-high voltage direct current transmission) power transmission system brings great benefits and complexity of operation and a series of new problems. The failure of phase commutation and locking of the direct current system can generate larger system impact on the alternating current system, and the safe and stable operation of the power grid is influenced.
The existing simulation tools for researching the direct current system mainly have two types, one type is an electromechanical transient simulation program, such as PSS/E, BPA, PSASP and the like, and the adopted direct current model is rough, so that the running characteristic of the direct current system under the asymmetric alternating current fault can not be accurately simulated, and the situation of phase commutation failure can not be accurately simulated; the other type is an electromagnetic transient simulation program, such as PSCAD and RTDS, which can accurately simulate the working condition of the converter valve after an asymmetric fault occurs in an alternating current system, including the working condition of phase change failure, but the simulation speed is slow, and the model cannot be used for a long time in general transient stability calculation.
Aiming at the inapplicability of the current direct current model in receiving end large power grid simulation analysis, an extra-high voltage direct current practical model suitable for large power grid electromechanical simulation needs to be established, on one hand, the model has enough precision and can accurately reflect the power change of an inverter station under different faults, on the other hand, the electromagnetic transient state of a direct current system is ignored, so that the model can be used for the electromechanical transient state simulation of the large power grid, and powerful means and tools are provided for the accurate analysis of the large system and some relevant measures taken.
Disclosure of Invention
Aiming at the inapplicability of the current direct current model in receiving-end large power grid simulation analysis, the invention provides a UHVDC practical model modeling method suitable for receiving-end large power grid simulation analysis, and the technical scheme adopted by the invention is as follows:
in order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a UHVDC model suitable for receiving-end large power grid simulation analysis comprises a converter transformer module, a converter valve group, reactive compensation equipment and a controller; the converter valve group is connected with the converter transformer module, the reactive compensation equipment is connected with the converter transformer module, and the controller is connected with the converter valve group.
The converter transformer module is decoupled into a first transformer module and a second transformer module; the converter bus voltage (alternating current voltage) U1 inputs voltage to the converter valve group through the second transformer module; the controller selects and determines parameters of the converter valve group according to the fault scene; the converter valve group outputs active power Ps and reactive power, meanwhile, the active power Ps and the reactive power are input into the first transformer module, and the output of the first transformer module HT1 is the reactive power Qs1 after the reactive power loss of the converter transformer module; the voltage U1 of the converter bus is input to reactive compensation equipment, and the reactive compensation equipment outputs reactive power Qs 2; the output reactive power Qs2 of the reactive compensation equipment and the output reactive power Qs1 of the first transformer module are added to the reactive power Qs transmitted to the alternating current system by the direct current system inverter station.
The converter transformer module is decoupled into a first transformer module and a second transformer module; after the decoupling is carried out into two modules, the input quantity and the output quantity of each module are very small, and the decoupling is simpler, easier to use and easy to realize.
The decoupling of the converter transformer module comprises the following steps:
1) before the decoupling of the converter transformer module, the input of the converter transformer module is converter bus voltage U1, the direct current system outputs active power and reactive power, the output is active power Ps injected into the alternating current system, reactive power Qs and commutation voltage of the inverter station, after the decoupling of the converter transformer module is performed to the first transformer module and the second transformer module, the second transformer module is a single-input single-output module, the first transformer module is a two-input single-output module, and therefore modeling is easier, and the decoupling of the converter transformer module is simple and easy to use and easy to realize.
2) Simulating a second transformer module: the second transformer module converts the converter bus voltage U1 into commutation voltage according to the transformation ratio of the converter transformer, the input of the second transformer module is the converter bus voltage U1, and the output is the commutation voltage of the inverter station;
3) simulating a first transformer module, neglecting the influence of the active power loss and the positive sequence voltage of the first transformer module on the power loss of the first transformer module, and only considering the reactive power lost by the converter transformer, wherein the input of the first transformer module is the active power and the reactive power of a direct current system, and the output is the reactive power Qs1 output by an inverter station after passing through the converter transformer;
in consideration of the fact that the active power loss of the converter transformer is not significant in proportion to the active power injected into the ac system during the transient state, the active power loss of the transformer will not be considered in the simplified model. On the other hand, the influence of the positive sequence voltage on the power loss of the transformer is smaller than the change of the power loss of the transformer caused by the apparent power change of the transformer, so that the positive sequence voltage is considered to only influence the commutation voltage of the converter, and the influence of the positive sequence voltage on the power loss of the converter is not considered. Only the reactive power lost by the converter transformer is therefore taken into account in this model. The transformer reactive power has a large relationship with its current, i.e. it is strongly related to the apparent power. Therefore, the input of the module is the active power and the reactive power of the direct current system, and the output of the module is the reactive power output by the inverter station after passing through the converter transformer.
1) Performing characteristic analysis on responses under different fault types: the UHVDC model for receiving-end large power grid simulation analysis comprises a converter transformer module, a converter valve group, reactive compensation equipment and a controller; observing output power dynamic response waveforms of the extra-high voltage direct current system under different disturbance types according to the measured data and the simulation data in the electromagnetic transient simulation tool, and analyzing and obtaining the dynamic characteristics of each module under the fault of the alternating current power grid by combining the working mechanism of each module in the model under the actual condition;
after different functions are adopted to represent different characteristics of each module, substituting the functions or the function combinations into each module to perform parameter fitting of the model; obtaining a parameter table of the UHVDC model under different fault scenes;
2) modeling by modules: different functions are adopted to represent different module characteristics, and each module is represented by a function or a function combination; the converter transformer module is decoupled into a first transformer module and a second transformer module, and because the influences of the first transformer module and the second transformer module are approximately proportional, the first transformer module and the second transformer module are respectively simplified into a proportional function module;
(201) converter valve group
Different functions are adopted to realize the characteristics of the converter valve group at different stages; the falling and climbing of the power are realized by adopting a climbing function, and the low power is maintained by adopting an amplitude limiting function;
(202) converter transformer module
The converter transformer module affects the commutation voltage of the converter on one hand, and on the other hand, the converter transformer module affects the power injected into an alternating current system by the converter due to active power and reactive power loss of the converter; simulating a converter transformer module by adopting a proportional function;
(203) the reactive power compensation module performs characteristic analysis on reactive power waveforms provided by reactive power compensation equipment under different disturbance types according to actual measurement and simulation data: the reactive compensation equipment comprises a filter and a static dynamic reactive compensation device SVG;
under the time scale of disturbance, the reactive power emitted by the capacitor of the filter is influenced by the voltage at the end of the filter; the method comprises the following steps of describing a three-phase alternating-current system by positive sequence voltage, describing the fault degree of the alternating-current system by the positive sequence voltage, and simulating the positive sequence voltage by a step function; simulating the switching of the filter by using a step function;
the dynamic process of the inertia link under the action of the step function is very similar to the simulation waveform when a detailed model is adopted, so that the dynamic process of a first-order inertia link simulation filter in the disturbance process is considered, on one hand, the simulation accuracy can be realized, and on the other hand, the first-order inertia link is simple and easy to use and meets the purpose and the requirement of modeling;
in consideration of cost and other factors, the dynamic reactive power compensation device SVG is far from an alternating current filter in capacity configuration, but can play a role in balancing reactive power output; the SVG is simulated by a constant and a first-order inertia link; the reactive power Qs transmitted to the alternating current system by the direct current system inverter station is the sum of the output reactive power Qs2 of the reactive compensation equipment and the output reactive power Qs1 of the first transformer module.
3) Parametric fitting of models
After different functions are adopted to represent different characteristics of each module, substituting the functions or the function combinations into each module to perform parameter fitting of the model; obtaining a parameter table 1 under different fault scenes, wherein the active power amplitude limiting time TPRestoring climbing rate Kp of active power and impact amplitude Q of reactive powerAmpAnd Kq is the reactive power recovery ramp rate.
TABLE 1 parameter Table under different fault scenarios
4) Decoupling and open-loop control:
the controller obtains active power Ps and reactive power Qs of an inverter station injection alternating current system under different fault scenes through preset mode matching, and the active power Ps and the reactive power Qs are matched with measured data or simulation data; the UHVDC model is converted into an open-loop overall structure, is simpler and more practical, and can be used for simulation analysis of a preset scene;
under different types of faults, the change trends of active power injected into an alternating current system by a direct current system are consistent, and the difference is that the amplitude of active power drop is different and the recovery time of the active power is different; the basic trend of reactive power consumed by the direct current system is consistent, and the difference is that the amplitude and the speed of reactive power impact are different. Therefore, the controller module can obtain active power and reactive power of the inverter station injected into the alternating current system under different fault scenes through preset mode matching, and the active power and the reactive power are matched with measured data or simulation data. Therefore, the whole model is converted into an open-loop overall structure, is simpler and more practical, and can be used for simulation analysis of a preset scene.
5) Splicing modules of each part: the action process of the controller needs to consider the operation mechanism and event driving according to a direct current system, so that a simulation scene is formed, and a simulation time sequence based on a time table is formed; according to the formed time sequence table, connecting the converter transformer module, the converter valve group, the reactive compensation equipment and the controller: the converter valve group is connected with the converter transformer module, the reactive compensation equipment and the filter are connected with the converter valve group, and the controller is connected with the converter transformer module; the converter bus voltage (alternating current voltage) U1 inputs voltage to the converter valve group through the second transformer module; the controller selects and determines parameters of the converter valve group according to the fault scene; the converter valve group outputs active power Ps and reactive power, meanwhile, the active power Ps and the reactive power are input into the first transformer module, and the output of the first transformer module HT1 is the reactive power Qs1 after the reactive power loss of the converter transformer module; the voltage U1 of the converter bus is input to reactive compensation equipment, and the reactive compensation equipment outputs reactive power Qs 2; the output reactive power Qs2 of the reactive compensation equipment and the output reactive power Qs of the first transformer module are added to form reactive power Qs transmitted to the alternating current system by the direct current system inverter station.
Preferably, the UHVDC model is built in MATLAB.
The invention has the beneficial effects that: the invention discloses a UHVDC model and a modeling method suitable for simulation analysis of a receiving-end large power grid, which can obtain the condition that an inversion station injects active power and reactive power of an alternating current system according to different fault scenes, so that the whole model is changed from a closed-loop system into an open-loop system, and becomes simpler and more practical.
Drawings
FIG. 1 is a diagram of a UHVDC utility model structure suitable for receiving end large power grid simulation analysis;
FIG. 2 is a flow chart of a modeling method of a UHVDC utility model;
fig. 3 is a dynamic response curve of the output of the dc system with power under different types of faults;
FIG. 4a is an active power P simulation curve comparison of a UHVDC practical model and a detailed model under a single-phase earth fault;
fig. 4b is a comparison of reactive power Qs simulation curves for a UHVDC practical model and a detailed model under a single-phase ground fault.
Detailed Description
The present invention will be better understood and implemented by those skilled in the art by the following detailed description of the technical solution of the present invention with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.
Referring to fig. 1, a UHVDC model suitable for receiving-end large grid simulation analysis includes a converter transformer module HT, a converter valve group HC, reactive compensation devices HF, HG, and a controller; the converter valve group HC is connected with the converter transformer module HT, the reactive compensation devices HF and HG are connected with the converter transformer module HT, and the controller is connected with the converter valve group HC.
The converter transformer module HT is decoupled into a first transformer module HT1 and a second transformer module HT 2; the converter bus voltage alternating current voltage U1 inputs voltage to the converter valve group HC through the second transformer module HT 2; the controller selects and determines parameters of the converter valve set HC according to the fault scene; the converter valve group HC outputs active power Ps and reactive power, meanwhile, the active power Ps and the reactive power are input into the first transformer module HT1, and the output of the first transformer module HT1 is reactive power Qs1 after the reactive power loss of the converter transformer module; the converter bus voltage U1 is input to reactive compensation equipment HF and HG, and the reactive compensation equipment HF and HG output reactive power Qs 2; the output reactive power Qs2 of the reactive power compensation devices HF, HG and the output reactive power Qs1 of the first transformer module HT1 add up the reactive power Qs transmitted to the ac system for the dc system inverter station.
The converter transformer modules are decoupled into a first transformer module HT1 and a second transformer module HT 2; after the decoupling is carried out into two modules, the input quantity and the output quantity of each module are very small, and the decoupling is simpler, easier to use and easy to realize.
The decoupling of the converter transformer module comprises the following steps:
1) before the decoupling of the converter transformer module, the input of the converter transformer module HT is converter bus voltage U1, the output of the direct current system is active power and reactive power, the output is active power Ps and reactive power Qs injected into the alternating current system and commutation voltage of an inverter station, after the decoupling of the converter transformer module is performed on the first transformer module HT1 and the second transformer module HT, the second transformer module HT2 is a single-input single-output module, and the first transformer module HT1 is a two-input single-output module, so that the modeling is easier, the method is simple and easy to use, and the realization is easy.
2) Simulation of the second transformer module HT 2: the second transformer module HT2 converts the converter bus voltage U1 into commutation voltage according to the transformation ratio of the converter transformer, the input of the second transformer module HT2 is the converter bus voltage U1, and the output is the commutation voltage of the inverter station;
3) simulating a first transformer module HT1, neglecting the influence of active power loss and positive sequence voltage of the first transformer module HT1 on power loss of the first transformer module HT1, only considering reactive power lost by a converter transformer, inputting the first transformer module HT1 into active power and reactive power of a direct current system, and outputting reactive power Qs1 output by an inverter station after passing through the converter transformer;
in consideration of the fact that the active power loss of the converter transformer is not significant in proportion to the active power injected into the ac system during the transient state, the active power loss of the transformer will not be considered in the simplified model. On the other hand, the influence of the positive sequence voltage on the power loss of the transformer is smaller than the change of the power loss of the transformer caused by the apparent power change of the transformer, so that the positive sequence voltage is considered to only influence the commutation voltage of the converter, and the influence of the positive sequence voltage on the power loss of the converter is not considered. Only the reactive power lost by the converter transformer is therefore taken into account in this model. The transformer reactive power has a large relationship with its current, i.e. it is strongly related to the apparent power. Therefore, the input of the module is the active power and the reactive power of the direct current system, and the output of the module is the reactive power output by the inverter station after passing through the converter transformer.
As shown in fig. 2, a UHVDC model modeling method suitable for receiving-end large grid simulation analysis includes the following steps:
1) performing characteristic analysis on responses under different fault types: the UHVDC model for receiving-end large power grid simulation analysis comprises a converter transformer module HT, a converter valve group HC, reactive compensation equipment HF and HG and a controller; observing output power dynamic response waveforms of the extra-high voltage direct current system under different disturbance types according to the measured data and the simulation data in the electromagnetic transient simulation tool, and analyzing and obtaining the dynamic characteristics of each module under the fault of the alternating current power grid by combining the working mechanism of each module in the model under the actual condition;
as shown in fig. 3, although there are differences in the waveforms of active power injected into the ac system by the inverter station under different disturbances, which are represented by different amplitudes of active power falling, different times of low power maintenance, and different rates of power climbing, the trend of active power change is consistent, and therefore, the active power change of the inverter station under the phase commutation failure can be divided into the following three stages: a power-down phase, a low-power maintenance phase, a power-up phase.
2) Modeling by modules: different functions are adopted to represent different module characteristics, and each module is represented by a function or a function combination; the converter transformer modules are decoupled into a first transformer module HT1 and a second transformer module HT2, and because the influences of the first transformer module HT1 and the second transformer module HT2 are approximately proportional, the first transformer module HT1 and the second transformer module HT2 are respectively simplified into a proportional function module;
(201) converter valve group
Different functions are adopted to realize the characteristics of the converter valve group HC at different stages; the power drop and rise are realized by adopting a ramp function in MATLAB, and the low power maintenance adopts a limiting function (saturation);
(202) converter transformer module
The converter transformer module HT influences the commutation voltage of the converter on one hand, and influences the power injected into an alternating current system by the converter due to active power and reactive power loss of the converter on the other hand; simulating a converter transformer module by adopting a proportional function (Gain);
(203) the reactive power compensation module performs characteristic analysis on reactive power waveforms provided by reactive power compensation equipment HF and HG under different disturbance types according to actual measurement and simulation data: the reactive compensation equipment HF and HG comprise filters HF and static dynamic reactive compensation devices SVG (HG);
on the time scale of the disturbance, the reactive power emitted by the capacitor of the filter HF is influenced by the voltage at the filter HF; describing a three-phase alternating-current system by using positive sequence voltage, describing the fault degree of the alternating-current system by using the positive sequence voltage, and simulating the positive sequence voltage by using a step function (step); simulating the switching of the filter by using a step function (step);
the dynamic process of the inertia link under the action of the step function is very similar to the simulation waveform when a detailed model is adopted, so that the dynamic process of a filter in the disturbance process is simulated by using a first-order inertia link (Transfer fcn), on one hand, the simulation accuracy can be realized, and on the other hand, the first-order inertia link is simple and easy to use and meets the purpose and the requirement of modeling;
in consideration of cost and other factors, the dynamic reactive power compensation device SVG (HG) can play a role in balancing reactive power output although being far from an alternating current filter in capacity configuration; simulating a dynamic reactive power compensation device SVG by using a constant (constant) and a first-order inertia link (Transfer fcn); the reactive power Qs transmitted by the dc system inverter station to the ac system is the sum of the output reactive power Qs2 of the reactive compensation devices HF, HG and the output reactive power Qs1 of the first transformer module HT 1.
3) Performing parametric fitting of a model
After different functions are adopted to represent different characteristics of each module, substituting the functions or the function combinations into each module to perform parameter fitting of the model; obtaining a parameter table 1 under different fault scenes, wherein the active power amplitude limiting time TPRestoring climbing rate Kp of active power and impact amplitude Q of reactive powerAmpAnd Kq is the reactive power recovery ramp rate.
TABLE 1 parameter Table under different fault scenarios
4) Decoupling and open-loop control:
the controller obtains active power Ps and reactive power Qs of an inverter station injection alternating current system under different fault scenes through preset mode matching, and the active power Ps and the reactive power Qs are matched with measured data or simulation data; the UHVDC model is converted into an open-loop overall structure, is simpler and more practical, and can be used for simulation analysis of a preset scene;
under different types of faults, the change trends of active power injected into an alternating current system by a direct current system are consistent, and the difference is that the amplitude of active power drop is different and the recovery time of the active power is different; the basic trend of reactive power consumed by the direct current system is consistent, and the difference is that the amplitude and the speed of reactive power impact are different. Therefore, the controller module can obtain active power and reactive power of the inverter station injected into the alternating current system under different fault scenes through preset mode matching, and the active power and the reactive power are matched with measured data or simulation data. Therefore, the whole model is converted into an open-loop overall structure, is simpler and more practical, and can be used for simulation analysis of a preset scene.
5) Splicing modules of each part: the action process of the controller needs to consider the operation mechanism and event driving according to a direct current system, so that a simulation scene is formed, and a simulation time sequence based on a time table is formed; according to the formed time sequence table, connecting the converter transformer module, the converter valve group, the reactive compensation equipment and the controller: the converter valve group HC is connected with the converter transformer module, the reactive compensation equipment HG and the filter HF are connected with the converter valve group HC, and the controller is connected with the converter transformer module; the converter bus voltage alternating current voltage U1 inputs voltage to the converter valve group HC through the second transformer module HT 2; the controller selects and determines parameters of the converter valve set HC according to the fault scene; the converter valve group HC outputs active power Ps and reactive power, meanwhile, the active power Ps and the reactive power are input into the first transformer module HT1, and the output of the first transformer module HT1 is reactive power Qs1 after the reactive power loss of the converter transformer module; the converter bus voltage U1 is input to reactive compensation equipment HF and HG, and the reactive compensation equipment HF and HG output reactive power Qs 2; the output reactive power Qs2 of the reactive power compensation devices HF, HG and the output reactive power Qs of the first transformer module HT1 are added to the reactive power Qs transmitted to the ac system for the dc system inverter station.
The UHVDC practical model is built in MATLAB according to the steps, single-phase earth faults are selected in a fault scene, the simulation result of the UHVDC practical model is compared with the simulation result of the detailed model, as shown in figures 4a and 4b, the effectiveness of the model is verified, the figures 4a and 4b respectively show the comparison of the UHVDC practical model under the single-phase earth faults with the active power P and the reactive power Qs of the detailed model, 4a shows the active power P of the inverter station injected into the alternating current system under the single-phase earth faults, and 4b shows the reactive power Qs of the inverter station injected into the alternating current system under the single-phase earth faults.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A UHVDC model modeling method suitable for receiving end large power grid simulation analysis is characterized by comprising the following steps:
1) performing characteristic analysis on responses under different fault types: the UHVDC model for receiving end large power grid simulation analysis comprises a converter transformer module (HT), a converter valve group (HC), reactive compensation equipment (HF, HG) and a controller; obtaining the output power dynamic response waveforms of the extra-high voltage direct current system under different disturbance types according to the measured data and the simulation data in the electromagnetic transient simulation tool, and analyzing and obtaining the dynamic characteristics of each module under the fault of the alternating current power grid by combining the working mechanism of each module in the model under the actual condition;
2) modeling by modules: different functions are adopted to represent different module characteristics, and each module is represented by a function or a function combination; the converter transformer module is decoupled into a first transformer module and a second transformer module, and the first transformer module and the second transformer module are respectively simplified into a proportional function module;
3) performing parameter fitting of the model:
after different functions are adopted to represent different characteristics of each module, substituting the functions or the function combinations into each module to perform parameter fitting of the model; obtaining a parameter table of the UHVDC model under different fault scenes;
4) decoupling and open-loop control:
the controller obtains active power Ps and reactive power Qs of an inverter station injection alternating current system under different fault scenes through preset mode matching, and the active power Ps and the reactive power Qs are matched with measured data or simulation data; the UHVDC model is converted into an open-loop overall structure;
5) splicing modules of each part: the action process of the controller is driven according to the operation mechanism and the event of the direct current system to form a simulation scene, and further a simulation time sequence based on a time table is formed; connecting the converter transformer module (HT), the converter valve group (HC), the reactive compensation equipment (HF, HG) and the controller according to the formed time sequence table; the converter valve group (HC) is connected with the converter transformer module (HT), the reactive compensation equipment (HF, HG) is connected with the converter transformer module (HT), the controller is connected with the converter valve group (HC), and the voltage of the converter bus U1 is input into the converter valve group (HC) through the second transformer module (HT 2); the controller selects and determines parameters of a converter valve group (HC) according to a fault scene; the converter valve group (HC) outputs active power Ps and reactive power, meanwhile, the active power Ps and the reactive power are input into the first transformer module (HT1), and the output of the first transformer module (HT1) is reactive power Qs1 after reactive loss of the converter transformer module (HT); the converter bus voltage U1 is input to the reactive compensation equipment (HF, HG), and the reactive compensation equipment (HF, HG) outputs reactive power Qs 2; the output reactive power Qs2 of the reactive compensation devices (HF, HG) and the output reactive power (HT) of the first transformer module (HT1) add up the reactive power Qs transmitted to the ac system for the dc system inverter station.
2. The UHVDC model modeling method suitable for receiving large power grid simulation analysis according to claim 1,
step 2) modeling by modules specifically comprises the following steps:
(201) converter valve group
Different functions are adopted to realize the characteristics of the converter valve group (HC) at different stages; the falling and climbing of the power are realized by adopting a climbing function, and the low power is maintained by adopting an amplitude limiting function;
(202) converter transformer module
The converter transformer module (HT) adopts a proportional function to simulate a converter transformer; the converter transformer module (HT) is decoupled into a first transformer module (HT1) and a second transformer module (HT2), and the first transformer module (HT1) and the second transformer module (HT2) are simplified into proportional function simulation respectively;
(203) the reactive power compensation modules (HF, HG) perform characteristic analysis on reactive power waveforms provided by the reactive compensation devices (HF, HG) under different disturbance types according to the actual measurement and simulation data: the reactive compensation equipment (HF, HG) comprises a filter (HF) and a static dynamic reactive compensation device SVG (HG);
on the time scale of the occurrence of the disturbance, the reactive power emitted by the capacitor of the filter (HF) is influenced by the voltage at the filter (HF) terminal; the method comprises the following steps of describing a three-phase alternating-current system by positive sequence voltage, describing the fault degree of the alternating-current system by the positive sequence voltage, and simulating the positive sequence voltage by a step function; simulating the switching of the filter by using a step function;
simulating a dynamic process of the filter in a disturbance process by using a first-order inertia link;
simulating a first-order inertia link by using a constant of a dynamic reactive power compensation device SVG; the reactive power Qs transmitted by the direct current system inverter station to the alternating current system is the sum of the output reactive power Qs2 of the reactive compensation equipment (HF, HG) and the output reactive power Qs1 of the first transformer module (HT 1).
3. The UHVDC model modeling method suitable for receiving large power grid simulation analysis according to claim 1,
the parameter table of the UHVDC model under different fault scenes is shown as table 1, wherein TPRestoring the climbing rate and Q for the active power amplitude limiting time and KpAmpRestoring the climbing rate for the reactive power impact amplitude and Kq for the reactive power;
TABLE 1 parameter Table of UHVDC model under different fault scenarios
4. The UHVDC model modeling method suitable for simulation analysis of the receiving large power grid according to claim 1, characterized in that the UHVDC model is built in MATLAB.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105375506A (en) * | 2015-10-30 | 2016-03-02 | 河南行知专利服务有限公司 | EHV (extra-high voltage) DC power transmission simulation system |
| CN106549377A (en) * | 2016-12-09 | 2017-03-29 | 西安交通大学 | A kind of handover method of alternating current-direct current combined hybrid system electromechanics electromagnetic transient hybrid simulation |
Non-Patent Citations (3)
| Title |
|---|
| 基于Matlab/Simulink的直流输电***的建模与仿真;赵晓娜 等;《四川电力技术》;20100220;22-24、33 * |
| 大规模风电直流外送***的仿真与协调控制策略研究;朱艺颖;《中国博士学位论文全文数据库 工程科技Ⅱ辑》;20141215;全文 * |
| 考虑无功控制特性的交直流电网双解耦潮流计算方法;张宁宇 等;《电工技术学报》;20161215;全文 * |
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