CN110597085A - Simulation model of static series compensator and distributed cluster simulation system - Google Patents
Simulation model of static series compensator and distributed cluster simulation system Download PDFInfo
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Abstract
The invention provides a simulation model of a static series compensator and a distributed cluster simulation system, wherein the simulation model is represented by a direct current capacitor, a controlled voltage source and a controlled current source, the controlled voltage source is controlled by a duty ratio d and a direct current capacitor voltage, the controlled current source is controlled by the current and the duty ratio d of the controlled voltage source, and an equivalent DSSC unit model is used for simulating instead of a detailed model, so that the problem that the cluster simulation using a large number of power electronic switching devices occupies a large amount of memory and consumes long time when the DSSC unit detailed model is used is solved; the distributed cluster simulation system keeps high consistency with the cluster simulation performed by adopting a DSSC detailed model on the output voltage and current characteristics, and provides an effective solution for efficiently and quickly analyzing the working characteristics of the DSSC cluster and analyzing the effectiveness of control strategies in the centralized controller and the unit controller.
Description
Technical Field
The invention belongs to the technical field of electrician and electricity, and particularly relates to a simulation model of a static series compensator and a distributed cluster simulation system.
Background
In a complex mesh power transmission system, the line power flow distribution rule is complex, and a special power flow control device is often needed to be configured to control the power flow in important lines so as to prevent the power flow of some lines from exceeding the heat capacity limit of the lines and limiting the transmission capability of the whole network. The Distributed Static Series Compensator (DSSC) connects small-capacity series compensation equipment in series on a transmission line in a transformer coupling mode, adjusts line impedance through coordination control of a large number of Distributed units, and can realize flexible and continuous control of line power flow. The controller is small in size and light in weight, can be directly hung on a transmission line or a tower, does not need to occupy the land for installation, and is a novel tidal current controller with high practicability.
As shown in fig. 1, the DSSC main loop is composed of a single-phase converter, a dc bus capacitor C1, an LC filter, a single-winding transformer T, and a bypass switch Sm. The single-winding transformer T directly takes a power transmission line as a primary winding, and the number of turns of a secondary winding is generally more than 10 times, even hundreds times, of that of the primary winding, so that the current flowing through equipment is reduced. The single-phase converter is usually a full-bridge converter. The bypass switch Sm comprises a mechanical switch and a thyristor pair controllable high-speed bypass switch, is kept to be open when the DSSC operates normally, and is closed when the DSSC exits from operation normally or needs to bypass the converter due to faults, so that the converter is bypassed. The operation principle of the DSSC is to inject a voltage which is independent of the line current in terms of the magnitude and perpendicular to the phase of the line current on the power transmission line connected in series, and the change of the magnitude of the voltage is equivalent to the change of the effective impedance of the line, thereby controlling the system power flow.
Because each DSSC unit has a small capacity, its ability to change line impedance is limited, and because the ability to control line power flow is also limited, it is necessary to coordinate a large number of DSSC units distributed in a line to control the power flow of a given line. Therefore, simulation research on the operation of the DSSC cluster is necessary for analyzing the operating characteristics of the cluster and providing guidance for control strategies.
Because each DSSC unit includes a power electronic switching device, and the power electronic switching device usually occupies more operation memory in the simulation model, when the simulation model includes a large number of DSSC units, the simulation speed is severely limited, and the requirement on the memory space of the computer is high, which severely limits the efficiency of DSSC cluster simulation. Therefore, how to build a cluster simulation model of the DSSC, the problems of high occupied memory and low simulation efficiency caused by a large number of DSSC units are solved, and the cluster simulation model is an inevitable problem in the process of popularizing and applying the DSSC.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a simulation model of a static series compensator and a distributed cluster simulation system, which can realistically simulate the output characteristics of the static series compensator and save time for performing cluster simulation.
A simulation model of a static series compensator comprises a single-phase converter, a direct-current bus capacitor C1, an LC filter, a single-winding transformer T and a bypass switch sm, wherein the single-phase converter is realized by simulation of a converter simplified model to form a simulation model; the simplified converter model comprises an ammeter A1, a controlled voltage source AC, a controlled current source DC, a voltmeter V1 and two multipliers; the ammeter A1 and a controlled voltage source AC are connected in series in an LC filter circuit; the voltmeter V1 and the controlled current source DC are connected in parallel at two ends of the direct current bus capacitor C1;
one of the two multipliers receives the output current iac of the ammeter A1 and the duty ratio d of the external input, and the multiplied output current iac is used for controlling the controlled current source DC to generate a current value idc equal to the product of iac and d;
the other multiplier of the two multipliers receives the voltage value udc output by the voltmeter V1 and is used for controlling the controlled voltage source AC to generate the voltage value uac with the magnitude equal to the product of the voltage value udc and d.
A distributed cluster simulation system of a static series compensator simulation model is characterized in that a plurality of static series compensator simulation models are arranged on each line, and each static series compensator simulation model is composed of a unit controller; all the unit controllers are controlled by one integrated controller;
the integrated controller calculates according to a set control target through a set control algorithm and outputs a voltage instruction value to the unit controller;
and the unit controller is connected with the instruction of the collection controller, performs operation according to a set control algorithm and outputs the duty ratio d to the simulation model of the static series compensator.
Furthermore, the system also comprises a delay module which is respectively introduced between the integrated controller and each unit controller and is used for simulating the communication delay between the integrated controller and the unit controllers.
The invention has the following beneficial effects:
the simulation model of the static series compensator provided by the invention is represented by a direct current capacitor, a controlled voltage source and a controlled current source, wherein the controlled voltage source is controlled by a duty ratio d and a direct current capacitor voltage, the controlled current source is controlled by the current of the controlled voltage source and the duty ratio d, and the DSSC unit model after equivalence replaces a detailed model for simulation, so that the problems that the DSSC unit detailed model occupies a large amount of memory and consumes long time because a large amount of power electronic switching devices are used for cluster simulation are solved; the distributed cluster simulation system keeps high consistency with the cluster simulation performed by adopting a DSSC detailed model on the output voltage and current characteristics, and provides an effective solution for efficiently and quickly analyzing the working characteristics of the DSSC cluster and analyzing the effectiveness of control strategies in the centralized controller and the unit controller.
Drawings
FIG. 1 is a diagram of a real DSSC topology;
FIG. 2 is a circuit diagram of a DSSC simulation model of the present invention;
FIG. 3 is a schematic diagram of a DSSC cluster simulation system;
FIG. 4 is a comparison graph of simulation results of an original DSSC model and the simulation model of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 2, the simulation model of the single static series compensator of the invention is composed of a simplified current transformer model, an LC filter, a bypass switch Sm, a dc bus capacitor C1 and a single winding transformer T; compared with the original static series compensator, the difference is that only the current converter simplified model is adopted to simulate the function of the original one-way current converter; the converter simplified model comprises an ammeter A1, a controlled voltage source AC, a controlled current source DC, a voltmeter V1 and two multipliers; the ammeter A1 and a controlled voltage source AC are connected in series in an LC filter circuit; the voltmeter V1 and the controlled current source DC are connected in parallel at two ends of the direct current bus capacitor C1;
one of the two multipliers receives the output current iac of the ammeter A1 and the duty ratio d of the external input, and the multiplied output current iac is used for controlling the controlled current source DC to generate a current value idc equal to the product of iac and d;
the other multiplier of the two multipliers receives the voltage value udc output by the voltmeter V1 and is used for controlling the controlled voltage source AC to generate the voltage value uac with the magnitude equal to the product of the voltage value udc and d.
The principle of the DSSC simplified model is that a single-phase converter in the DSSC outputs specified alternating current output voltage uac through the combination of four power electronic switching devices, and according to circuit theory analysis, the result of the combination of switching tubes meets the condition that the output alternating current voltage uac is equal to the product of direct current voltage udc and duty ratio d, and the direct current idc is equal to the product of output alternating current iac and duty ratio d. When the DSSC model is used for verifying the overall working characteristics of the DSSC cluster and the adjustment effect of the DSSC cluster on line power flow, the voltage and current conditions of four power electronic switching devices in the single-phase converter do not need to be considered, and only the relation between the alternating current output voltage and current and the direct current voltage and current of the single-phase converter in the model can be ensured to meet the real physical device. Therefore, the DSSC simplified model disclosed by the invention adopts the combination of the controlled voltage source and the controlled current source to replace the combination of four switching tubes, the control signals of the controlled voltage source and the controlled current source are designed, and the output voltage and the output current of the single-phase current converter in the simplified model are ensured to meet the condition that the output alternating current voltage uac is equal to the product of the direct current voltage udc and the duty ratio d, and the direct current idc is equal to the product of the output alternating current iac and the duty ratio d, so that the disclosed DSSC simplified model and the DSSC detailed model have the same external characteristics.
Based on the simplified simulation model of the single static series compensator, the invention also provides a distributed cluster simulation system, as shown in fig. 3, a plurality of static series compensator simulation models are arranged on each line, and each static series compensator simulation model is controlled by one unit controller; all the unit controllers are controlled by one integrated controller;
the integrated controller calculates according to a set control target through a set control algorithm and outputs a voltage instruction value to the unit controller; a delay module is respectively introduced between the integrated controller and each unit controller and is used for simulating communication delay between the integrated controller and the unit controllers;
and the unit controller is connected with the instruction of the collection controller, performs operation according to a set control algorithm and outputs the duty ratio d to the simulation model of the static series compensator.
After each static series compensator simulation model receives the duty ratio d, the real DSSC function can be simulated, and the control of the line load flow is realized.
Compared with cluster simulation results under the method and cluster simulation results of cluster simulation performed by adopting a DSSC unit detailed model for the same power network structure and the same DSSC cluster system, the voltage waveform of the alternating-current side output voltage and the direct-current side capacitor of each DSSC unit is shown in FIG. 4, so that the coincidence degree of the waveform of the detailed model and the waveform under the method is very high, and the cluster simulation method provided by the invention is proved to be capable of accurately reflecting the output characteristic and the direct-current side voltage fluctuation characteristic of the DSSC as the detailed model even though the DSSC unit model is checked. The cluster simulation model adopting the DSSC detailed model and the cluster simulation model in the invention are operated in the same computer, and the time consumption of the method in the invention is obviously shorter than that of the cluster simulation model in the invention.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A simulation model of a static series compensator, wherein the static series compensator comprises a single-phase converter, a direct-current bus capacitor C1, an LC filter, a single-winding transformer T and a bypass switch sm, and is characterized in that the single-phase converter is realized by simulation of a converter simplified model to form the simulation model; the simplified converter model comprises an ammeter A1, a controlled voltage source AC, a controlled current source DC, a voltmeter V1 and two multipliers; the ammeter A1 and a controlled voltage source AC are connected in series in an LC filter circuit; the voltmeter V1 and the controlled current source DC are connected in parallel at two ends of the direct current bus capacitor C1;
one of the two multipliers receives the output current iac of the ammeter A1 and the duty ratio d of the external input, and the multiplied output current iac is used for controlling the controlled current source DC to generate a current value idc equal to the product of iac and d;
the other multiplier of the two multipliers receives the voltage value udc output by the voltmeter V1 and is used for controlling the controlled voltage source AC to generate the voltage value uac with the magnitude equal to the product of the voltage value udc and d.
2. A distributed cluster simulation system based on the static series compensator simulation model of claim 1, wherein a plurality of static series compensator simulation models are provided on each line, each static series compensator simulation model being defined by a unit controller; all the unit controllers are controlled by one integrated controller;
the integrated controller calculates according to a set control target through a set control algorithm and outputs a voltage instruction value to the unit controller;
and the unit controller is connected with the instruction of the collection controller, performs operation according to a set control algorithm and outputs the duty ratio d to the simulation model of the static series compensator.
3. The distributed cluster simulation system of claim 2, further comprising a delay module respectively introduced between the centralized controller and each unit controller for simulating communication delay between the centralized controller and the unit controllers.
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