CN108711872B - Distributed subsynchronous oscillation suppression system and new energy power transmission system - Google Patents
Distributed subsynchronous oscillation suppression system and new energy power transmission system Download PDFInfo
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- CN108711872B CN108711872B CN201810434128.7A CN201810434128A CN108711872B CN 108711872 B CN108711872 B CN 108711872B CN 201810434128 A CN201810434128 A CN 201810434128A CN 108711872 B CN108711872 B CN 108711872B
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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
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- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention discloses a distributed subsynchronous oscillation suppression system and a new energy power transmission system, wherein the distributed subsynchronous oscillation suppression system comprises: the plurality of subsynchronous oscillation suppression devices are respectively and correspondingly arranged on the power transmission lines between the outlet ends of the plurality of new energy electric fields and the bus bars and are used for collecting electric signals on the power transmission lines and respectively suppressing subsynchronous oscillation of the plurality of new energy electric fields according to the electric signals; and the control device is used for outputting a distribution control signal according to the electric signal so as to distribute the output force conditions of the plurality of subsynchronous oscillation suppression devices. By analyzing the running condition of each power transmission line and further carrying out uniform scheduling and distribution on the output of the subsynchronous oscillation suppression device of each new energy electric field, subsynchronous oscillation of each line can be suppressed accurately and pertinently, each new energy electric field is suppressed pertinently, and the suppression effect is better.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a distributed subsynchronous oscillation suppression system and a new energy transmission system.
Background
Based on the rapid development of new energy power generation, china has become the country with the largest wind power grid-connected capacity and the fastest photovoltaic development. However, with the large-scale grid connection of new energy sources such as wind power and the like, the method brings new problems for the safe and stable operation of the power system besides the accompanying huge economic benefits. Obvious subsynchronous oscillation phenomenon is found in a plurality of wind power bases such as northwest, north China, northeast China and the like in China. Subsynchronous oscillation has become an important problem for safe and efficient operation of large new energy sources in China.
Typical subsynchronous oscillation suppression devices at present are mainly divided into a parallel subsynchronous oscillation suppression device and a serial subsynchronous oscillation suppression device, and excellent effects are obtained in suppressing subsynchronous oscillations of thermal power.
However, because the existing new energy subsynchronous oscillation suppression devices are often intensively fixed on a power supply side or a power transmission line to intensively suppress subsynchronous oscillations of all lines, the subsynchronous oscillations caused by the grid connection of the distributed new energy are relatively complex due to large difference of the operation conditions of the new energy electric fields, the subsynchronous oscillations after the grid connection of the distributed new energy electric fields are intensively suppressed by adopting the existing subsynchronous oscillation suppression technology, the subsynchronous oscillation suppression signals on a parallel network line are also required to be considered to be distributed to the subsynchronous oscillations of all the new energy electric fields, and the amplitude and the frequency of the subsynchronous oscillations generated by different new energy electric fields are possibly different, so that after grid connection, the subsynchronous oscillations are extremely complex, the subsynchronous oscillation signals cannot be suppressed for a plurality of times due to centralized suppression, and thus the suppression effect is not ideal.
Disclosure of Invention
The invention aims to solve the technical problem of improving the suppression effect of subsynchronous oscillation caused by grid connection of a distributed new energy electric field.
The embodiment of the invention provides a distributed subsynchronous oscillation suppression system, which is used for suppressing subsynchronous oscillation of a distributed new energy electric field and comprises the following components: the plurality of subsynchronous oscillation suppression devices are respectively and correspondingly arranged on the power transmission lines between the outlet ends of the plurality of new energy electric fields and the bus bars and are used for collecting electric signals on the power transmission lines and respectively suppressing subsynchronous oscillation of the plurality of new energy electric fields according to the electric signals; and the control device is respectively communicated with the plurality of subsynchronous oscillation suppression devices and is used for outputting a distribution control signal according to the electric signal so as to distribute the output force conditions of the plurality of subsynchronous oscillation suppression devices.
Optionally, the control device is further used for adjusting the power flow of the power transmission line of the multiple new energy electric fields according to the electric signals and the output capacity of the subsynchronous oscillation suppression device.
Optionally, the distributed subsynchronous oscillation suppression system further comprises: and a communication device connected to the control device and the subsynchronous oscillation suppression device, respectively.
Optionally, the plurality of subsynchronous oscillation suppression devices are locally interconnected by the communication device.
Optionally, a plurality of subsynchronous oscillation suppression devices are connected in series on the power transmission line at the outlet end of the same new energy electric field; the control device is used for starting the plurality of subsynchronous oscillation suppression devices one by one according to the electric signals.
Optionally, the subsynchronous oscillation suppression device further includes: the signal acquisition equipment is connected with the power transmission line and is used for acquiring an electric signal on the power transmission line and extracting a subsynchronous oscillation signal from the electric signal; the control device is connected with the signal acquisition device and is used for outputting a valve control signal according to the subsynchronous oscillation signal; the converter is connected with the control equipment and is used for outputting a corresponding subsynchronous impedance signal according to the valve control signal; and the primary winding of the transformer is connected in series with the power transmission line, and the secondary winding of the transformer is connected with the alternating current output end of the converter and is used for injecting the subsynchronous oscillation impedance voltage into the power transmission line according to the subsynchronous oscillation impedance signal.
Optionally, the converter includes: an H-bridge inverter.
Optionally, the H-bridge converter comprises a full-bridge H-bridge converter or a half-bridge H-bridge converter.
Optionally, the signal acquisition device comprises: the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line; the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal; and the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signals.
Optionally, the subsynchronous oscillation suppression device further includes: and the bypass switch is arranged between the converter and the transformer in parallel and used for controlling the input or the withdrawal of the corresponding subsynchronous oscillation suppression device.
According to a second aspect, an embodiment of the present invention provides a new energy transmission system, including: a distributed subsynchronous oscillation suppression system as described in any of the first aspects above; a plurality of distributed new energy electric fields; and the bus is used for collecting the power transmission lines at the outlet ends of the distributed new energy electric fields.
According to the distributed subsynchronous oscillation suppression system and the new energy power transmission system provided by the embodiment of the invention, the subsynchronous oscillation suppression devices are respectively arranged in the transmission lines of the new energy electric fields, the subsynchronous oscillation suppression devices are used for collecting electric signals on the transmission lines, respectively suppressing subsynchronous oscillation of the new energy electric fields according to the electric signals, and sending the electric signals to the control device, and the control device analyzes the running condition of each power transmission line according to the electric signals collected by each signal collection device, so that the output of the subsynchronous oscillation suppression devices on each transmission line is uniformly scheduled and distributed, the tide of each line can be compensated more accurately and more pointedly, the flexibility is high, subsynchronous oscillation of each new energy electric field is suppressed pointedly, the suppression frequency range of subsynchronous oscillation can be increased, and the suppression effect is better.
Drawings
FIG. 1 is a schematic diagram of a distributed subsynchronous oscillation suppression system in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of another distributed sub-synchronous oscillation suppression system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of another distributed sub-synchronous oscillation suppression system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of control logic of a communication device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another communication device control logic in an embodiment of the invention;
fig. 6 shows a schematic diagram of a new energy transmission system in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides a distributed subsynchronous oscillation suppression system for suppressing subsynchronous oscillation of a distributed new energy electric field, as shown in fig. 1, which comprises:
a plurality of subsynchronous oscillation suppression devices 10 respectively and correspondingly installed on the power transmission line 1 between the outlet ends of the plurality of new energy electric fields and the bus bar, and are used for respectively suppressing subsynchronous oscillation of the plurality of new energy electric fields; the subsynchronous oscillation suppression device 10 comprises a signal acquisition device 11 which is connected with the power transmission line 1 and is used for acquiring an electric signal on the power transmission line 1; the control device 20 is respectively communicated with the plurality of subsynchronous oscillation suppression devices 10 and is used for outputting a distribution control signal according to the electric signals so as to distribute the output conditions of the plurality of subsynchronous oscillation suppression devices 10.
In this embodiment, the distributed new energy electric fields reach the bus bars through the respective power transmission lines to be collected, and the outgoing lines are transmitted to the receiving end system after long-distance power transmission. The subsynchronous oscillation suppression device is respectively arranged on the transmission lines between the outlet ends of the new energy electric fields and the bus bars, the signal acquisition equipment in the subsynchronous oscillation suppression device is used for acquiring the electric signals in the corresponding transmission lines and sending the electric signals to the control device, the control device analyzes the running condition of each new energy electric field according to the electric signals acquired by each signal acquisition equipment, and then the output of the subsynchronous oscillation suppression device on each transmission line is uniformly distributed in a dispatching way, so that the subsynchronous oscillation suppression device on each transmission line can accurately and pointedly compensate the trend of each line, the flexibility is high, the subsynchronous oscillation of each new energy electric field can be pointedly suppressed, the suppression frequency range of the subsynchronous oscillation can be increased, and the suppression effect is better.
In this embodiment, the control device 20 is further configured to adjust the power flow of the power transmission line of the multiple new energy electric fields according to the electric signal and the output capability of the subsynchronous oscillation suppression device 10. In a specific embodiment, the control device 20 may obtain the electrical signals and device capacity information of the power transmission lines 1 sent by each subsynchronous oscillation suppression device 10, and output an adjustment command according to the optimal power flow principle in combination with the requirements of each power transmission line 1 and the new energy power transmission system, so as to control the output condition of each subsynchronous oscillation suppression device 10, and further adjust the power flow of the line. When the subsynchronous oscillation occurs, the electric signal acquired by the signal acquisition device 11 contains the subsynchronous oscillation signal, and after receiving the subsynchronous oscillation signal, the control device 20 uniformly distributes the power flow control output and the subsynchronous oscillation suppression output to each subsynchronous oscillation suppression device 10 according to the subsynchronous oscillation signal attribute (frequency, amplitude and distribution condition) and the capacity of the subsynchronous oscillation suppression device.
In an alternative embodiment, as shown in fig. 2, the subsynchronous oscillation suppression device 10 may include a signal acquisition device 11 connected to the power transmission line 1 and configured to acquire an electrical signal on the power transmission line 1 and extract a subsynchronous oscillation signal from the electrical signal; the control device 12 is respectively connected with the signal acquisition device 11 and is used for outputting a valve control signal according to the subsynchronous oscillation signal; an inverter 13 connected to the control device 12 for outputting a corresponding subsynchronous impedance signal in accordance with the valve control signal; the transformer 14, the primary winding of the transformer 14 is connected in series to the transmission line 1, and the secondary winding of the transformer 14 is connected with the ac output end of the converter 13, for injecting the subsynchronous oscillation impedance voltage into the transmission line 1 according to the subsynchronous oscillation impedance signal. In this embodiment, the valve control signal may be a pulse switching signal for controlling the switching of the power electronics in the inverter.
Specifically, the signal acquisition device 11 may include: a signal acquisition unit 111 for acquiring an electrical signal in the power transmission line 1. The signal acquisition unit 111 may include at least one of a voltage transformer, a current transformer, and a power transformer. At least one of a current signal, a voltage signal or a power signal in the power transmission line 1 is collected. Because the generated electric frequency range of the new energy electric field is wider and the frequency is not single, the frequency band of the generated subsynchronous oscillation signal is wider, and the filter 112 is used for filtering the electric signal to obtain the subsynchronous oscillation signal, in this embodiment, a band filter can be used. And a phase compensation unit 113 for compensating the subsynchronous oscillation signal. Specifically, taking current as an example for explanation, three-phase current on the power transmission line 1 is collected, current under a d-q axis coordinate system is obtained through coordinate transformation, phase of the current on the power transmission line 1 is obtained through a phase-locked loop, subsynchronous oscillation current is extracted according to the current after coordinate transformation, phase compensation is carried out on the subsynchronous oscillation current, and finally subsynchronous oscillation signals on the power transmission line 1 are obtained.
The valve control signal is a signal for controlling the electronic power switch in the converter to be opened and closed, specifically, the control device 12 may generate a pulse switch signal according to the subsynchronous oscillation signal so as to control the electronic power switch in the converter 13 to be opened and closed, for example, the IGBT to be opened and closed, so as to obtain a subsynchronous oscillation impedance signal.
The transformer 14 injects the subsynchronous oscillation impedance signal into the power transmission line 1 in the form of a subsynchronous oscillation impedance voltage, thereby suppressing subsynchronous oscillation in the power transmission line 1. In this embodiment, the primary winding of the transformer 14 is connected in series to the power transmission line, and the secondary winding of the transformer 14 is connected to the ac output end of the inverter 13, so that the transformer 14 may be a relatively lightweight transformer, for example, a buckle-mounted transformer may be used, because the distributed subsynchronous oscillation suppression device 10 suppresses subsynchronous oscillations of a single new energy electric field.
In an alternative embodiment, as shown in fig. 3, the distributed subsynchronous oscillation suppression system may further include a communication device 30, where the communication device 30 may be disposed on the side of the control device 20 and the subsynchronous oscillation suppression device 10, so that the subsynchronous oscillation suppression device 10 communicates with the control device 20, and in this embodiment, the communication device 30 may use wireless communication or wired communication. In this embodiment, wireless communication can be employed in order to reduce the cost. In a specific embodiment, on the side of the subsynchronous oscillation suppression device 10, one communication device 30 may be connected to the subsynchronous oscillation devices on the plurality of power transmission lines 1, for example, a control logic diagram of the communication device shown in fig. 4, in this embodiment, the subsynchronous oscillation suppression devices may also communicate with each other through the communication device 30, and the control device 20 may start the subsynchronous oscillation devices one by one according to the subsynchronous oscillation signal until the subsynchronous oscillation is sufficiently suppressed.
If the subsynchronous oscillation of the power transmission line 1 is serious, the corresponding subsynchronous oscillation suppression device may have insufficient suppression capability, so as to ensure that the subsynchronous oscillation on the power transmission line can be well suppressed. In an alternative embodiment, as shown in the control logic diagram of the communication device shown in fig. 5, a plurality of sub-synchronous oscillation suppression devices 10 may be connected in series on the same power transmission line 1, the communication device 30 may also be connected between a plurality of sub-synchronous oscillation suppression devices 10 connected in series, the respective sub-synchronous oscillation suppression devices 10 communicate with each other, and when the sub-synchronous oscillation occurs, the control device 20 may control one of the sub-synchronous oscillation suppression devices 10 to start, and the other sub-synchronous oscillation suppression devices 10 may be in a state to be started. After the maximum subsynchronous oscillation suppression function of the device is output, the device is put into operation with the subsequent subsynchronous oscillation suppression device 10 through the communication device 30 until subsynchronous oscillation on the power transmission line 1 can be completely suppressed.
In an alternative embodiment, the converter 13 may be an H-bridge converter, specifically may be a single H-bridge converter, and in this embodiment, because the subsynchronous oscillation suppression is performed for the electric field of multiple single new energy sources, the voltage withstanding capability and the current withstanding capability of a single IGBT device can completely meet the requirements, without adopting a complex main circuit structure such as multiple, multiple levels, and the like. The subsynchronous oscillation suppression device 10 has a simple structure and light weight, is beneficial to being directly hung on the power transmission line 1, and can save a large amount of land resources compared with a centralized subsynchronous oscillation suppression device. In this embodiment, the H-bridge inverter may be a full-bridge H-bridge inverter, or may be a half-bridge H-bridge inverter. In this embodiment, a compact converter of multi-H-bridge cascade may also be employed. The multi-H-bridge cascade compact converter can also meet the requirements of simple structure and light weight so as to be directly hung on the power transmission line 1.
To facilitate the input and the output of the subsynchronous suppression device, in an alternative embodiment, as shown in fig. 2 and 3, a bypass switch BRK is arranged in parallel between the converter 13 and the transformer 14, the subsynchronous oscillation suppression device 10 has two states, namely, the input and the output, specifically, the bypass switch BRK is arranged in parallel between the converter 13 and the transformer 14, the transformer can be a buckle-mounted transformer, the subsynchronous oscillation suppression device 10 is in the input state when the bypass switch BRK is opened, and the subsynchronous oscillation suppression device 10 is in the output state when the bypass switch BRK is closed. The bypass switch BRK comprises a mechanical switch and a power electronic switch or a mechanical switch and a power electronic switch which are connected in parallel and has the current turn-off and long turn-on operation capabilities. In this embodiment, the bypass switch BRK may be connected to the control device 20, and the on and off of the bypass switch may be controlled by the control device 20. The bypass switch BRK may also be connected to the control device 12, which controls the closing or opening of the bypass switch. If the subsynchronous oscillation suppression device 10 needs to be taken out of operation, the control device 20 or the control apparatus 12 can control the bypass switch BRK to be closed by outputting a control signal for controlling the switch to be closed. In this embodiment, the control device 20 or the control apparatus 12 may control the bypass switch BRK according to the electrical signal collected by the signal collecting apparatus, for example, when the subsynchronous oscillation signal is collected, the control switch is opened, and when the subsynchronous oscillation suppression device 10 is put into operation, the collected electrical signal is a steady operation signal of the power transmission system, the control switch may be controlled to be closed, so that the subsynchronous oscillation suppression device 10 is put out of operation. In this embodiment, the control device 20 may regulate the control apparatus 12 to control the bypass switch to open or close.
The embodiment of the invention also provides a new energy power transmission system, as shown in fig. 6, which comprises a plurality of distributed new energy electric fields 100 and a bus 200, wherein the bus 200 is used for collecting power transmission lines at the outlet ends of the distributed new energy electric fields; the distributed sub-synchronous oscillation suppression devices 300 described in the above embodiments are respectively installed on the power lines between the plurality of distributed new energy electric fields 100 and the bus bar 200. The power receiving terminal 400 is connected to a line at the power outlet terminal of the bus bar. In this embodiment, the new energy electric field may include a wind electric field and a photovoltaic electric field.
Each scattered new energy electric field reaches a bus bar through each power transmission line, and the lines at the outlet end of the bus bar are transmitted to a receiving end system after long-distance power transmission. The subsynchronous oscillation suppression devices are respectively arranged in the sending-out lines of the new energy sources, the signal acquisition equipment in the subsynchronous oscillation suppression devices acquires the electric signals in the corresponding power transmission lines and sends the electric signals to the control device, the control device analyzes the running conditions of the power transmission lines according to the electric signals acquired by the signal acquisition equipment, and then uniform scheduling distribution is carried out on the output of the subsynchronous oscillation suppression devices on the power transmission lines, so that the trend of the lines can be compensated accurately and pertinently, the flexibility is high, subsynchronous oscillation of electric fields of the new energy sources is pertinently suppressed, the range of the suppression frequency of the subsynchronous oscillation can be increased, and the suppression effect is better.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A distributed subsynchronous oscillation suppression system for suppressing subsynchronous oscillations of a distributed new energy electric field, comprising:
the plurality of subsynchronous oscillation suppression devices are respectively and correspondingly arranged on the power transmission lines between the outlet ends of the plurality of new energy electric fields and the bus bars and are used for collecting electric signals on the power transmission lines and respectively suppressing subsynchronous oscillation of the plurality of new energy electric fields according to the electric signals;
control means, in communication with the plurality of subsynchronous oscillation suppression means, for outputting a distribution control signal according to the electrical signal to distribute the output force conditions of the plurality of subsynchronous oscillation suppression means;
a plurality of subsynchronous oscillation suppression devices are connected in series on a power transmission line at the outlet end of the same new energy electric field; the control device is used for starting the plurality of subsynchronous oscillation suppression devices one by one according to the electric signals;
a plurality of subsynchronous oscillation suppression devices are connected in series on the same transmission line, the communication devices are respectively connected among the subsynchronous oscillation suppression devices which are connected in series, the subsynchronous oscillation suppression devices are communicated with each other, and when subsynchronous oscillation occurs, the control device controls one subsynchronous oscillation suppression device to start, and the other subsynchronous oscillation suppression devices are in a state to be started; after the maximum subsynchronous oscillation suppression function of the device is output, the device is input with a subsequent subsynchronous oscillation suppression device through a communication device until subsynchronous oscillation on the power transmission line can be completely suppressed.
2. The distributed subsynchronous oscillation suppression system of claim 1, wherein,
the control device is also used for adjusting the power flow of the power transmission line of the multiple new energy electric fields according to the electric signals and the output capacity of the subsynchronous oscillation suppression device.
3. The distributed subsynchronous oscillation suppression system of claim 1, further comprising:
and communication means connected to the control means and the subsynchronous oscillation suppression means, respectively.
4. A distributed subsynchronous oscillation suppression system as claimed in claim 3, wherein said plurality of subsynchronous oscillation suppression devices are locally interconnected by said communication device.
5. A distributed subsynchronous oscillation suppression system, as claimed in any one of claims 1-4, wherein said subsynchronous oscillation suppression device further comprises:
the signal acquisition equipment is connected with the power transmission line and is used for acquiring the electric signal on the power transmission line and extracting a subsynchronous oscillation signal from the electric signal;
the control device is connected with the signal acquisition device and is used for outputting a valve control signal according to the subsynchronous oscillation signal;
the converter is connected with the control equipment and is used for outputting a corresponding subsynchronous impedance signal according to the valve control signal;
and the primary winding of the transformer is connected in series with the power transmission line, and the secondary winding of the transformer is connected with the alternating current output end of the converter and is used for injecting the subsynchronous oscillation impedance voltage into the power transmission line according to the subsynchronous oscillation impedance signal.
6. A distributed subsynchronous oscillation suppression system as defined in claim 5, wherein said inverter comprises: an H-bridge inverter.
7. The distributed subsynchronous oscillation suppression system of claim 6, wherein said H-bridge converters comprise full-bridge H-bridge converters or half-bridge H-bridge converters.
8. The distributed subsynchronous oscillation suppression system of claim 5, wherein said signal acquisition device comprises:
the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line;
the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal;
and the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signal.
9. The distributed subsynchronous oscillation suppression system of claim 5, wherein said subsynchronous oscillation suppression device further comprises:
and the bypass switch is arranged between the converter and the transformer in parallel and used for controlling the input or the withdrawal of the corresponding subsynchronous oscillation suppression device.
10. The utility model provides a new forms of energy transmission system which characterized in that includes:
a distributed subsynchronous oscillation suppression system as claimed in any one of claims 1 to 9;
a plurality of distributed new energy electric fields;
and the bus is used for collecting the power transmission lines at the outlet ends of the distributed new energy electric fields.
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| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
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