CN113300369B - Loop line operation method based on power electronic transformer distribution network - Google Patents
Loop line operation method based on power electronic transformer distribution network Download PDFInfo
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- CN113300369B CN113300369B CN202110668522.9A CN202110668522A CN113300369B CN 113300369 B CN113300369 B CN 113300369B CN 202110668522 A CN202110668522 A CN 202110668522A CN 113300369 B CN113300369 B CN 113300369B
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
Abstract
The invention discloses a loop running method based on a power electronic transformer power distribution network, which consists of a phase detection module, a phase difference calculation module, a power point setting module, a power synchronization module, a voltage control module and a pulse width modulation module. The operation scheme disclosed by the invention has the advantages of simple control structure and convenient parameter adjustment, and can work normally and reliably in the radiation type power grid and the loop operation power grid by utilizing the power point setting module and the power synchronization module. In addition, through the presynchronization adjustment process disclosed by the scheme, the disturbance of voltage and phase when the radiation type power grid is switched to loop operation can be effectively reduced. In addition, the power point setting module and the power synchronization module can be used for adjusting the power of the loop running power grid, so that the excellent performance of the power grid after the running mode is converted is ensured.
Description
Technical Field
The invention relates to the technical field of application of power systems, in particular to a loop running method based on a power electronic transformer power distribution network.
Background
In order to face and solve the challenges of the large-scale development of new energy and the large-scale application of electric vehicles to the safe and reliable operation of a power grid, the power distribution network technology based on a power electronic transformer is widely focused as an effective method for challenge. Compared with the traditional transformer, the power electronic transformer is also called an intelligent transformer, and can realize continuous control of output voltage and frequency on the basis of realizing the functions of transformation and isolation. The power distribution network based on the power electronic transformer has the advantages of high electric energy quality, low electric energy loss, good voltage regulation performance, flexible control, convenience in scheduling and the like. In addition, the power electronic transformer can provide various auxiliary services for the medium-low voltage power grid, so that the reliability and the bearing capacity of the power grid are improved.
The power electronic transformer can be independently operated on a radiation type power grid or operated in a loop line operation mode. Compared with a radiation type power grid mode, the power distribution network running on a loop has higher potential in voltage control, power flow control and the like. Loop operation modes are often overloaded in other feeder circuits or require maintenance to be put into service, requiring the power electronic transformer (and in particular its low-side inverter) to be synchronized with other feeder voltages by a synchronous control scheme. Because the voltage amplitude and the phase difference of different feed lines cannot be ignored, if synchronous control or unreasonable control strategies are not adopted, the larger voltage amplitude difference or the phase difference can cause uncontrollable power flow, impact current and voltage jump are caused, and the safe and reliable operation of the power distribution network is seriously threatened. Traditional distribution network loop operation mode is difficult to be suitable for the novel power grid. At present, a part of literature is studied on flexible closed loops, but the flexible closed loops usually depend on additional power electronic equipment, and a synchronous scheme is complex in control structure. For this situation, a loop running method based on a power electronic transformer power distribution network is now proposed.
Disclosure of Invention
The invention aims to provide a loop running method based on a power electronic transformer power distribution network, which can effectively solve the loop running problem of the power electronic transformer power distribution network and overcome the transient problem in the process of switching a radiation type power grid to a looped network.
The aim of the invention can be achieved by the following technical scheme:
the loop running method comprises running and synchronization methods of the power electronic transformer in different modes and a power flow regulating method during loop running.
Further, the loop running method comprises a phase detection module, a phase difference calculation module, a power point setting module, a power synchronization module, a voltage control module and a pulse width modulation module.
Further, the loop operation method comprises three operation modes: the power distribution network comprises a radiation type power grid independent operation mode, a power electronic transformer and other feeder line pre-synchronization mode and a power electronic transformer-based distribution network loop operation mode, wherein bus switches in the first two operation modes are opened, and bus switches in the loop operation mode are closed.
Further, the phase detection module measures the amplitude and the phase of line voltage which needs to be synchronized with the feeder line of the power electronic transformer in real time, and the phase difference calculation module calculates the phase and the amplitude difference between the low-voltage side voltage of the power electronic transformer and the voltage of other feeder lines.
Further, the power point setting module and the power synchronization module are mutually matched in different modes, and in the radiation type power grid independent operation mode, the output voltage reference value of the power synchronization module is constant, and the output of the power point setting module is zero; in a power electronic transformer and other feeder line presynchronization mode and a loop line operation mode based on a power electronic transformer distribution network, a power point setting module provides corresponding power reference values for a power synchronization module, and regulates alternating current voltage reference values in real time so as to realize presynchronization and loop line operation functions.
Further, the power point setting module outputs different power reference values according to different working modes based on the power electronic transformer distribution network, and in the radiation type power grid independent operation mode, the power point setting module outputs zero, and no power is transmitted between feeder lines; in a presynchronization mode of the power electronic transformer and other feeder lines, the power point setting module outputs virtual power according to the phase difference and the amplitude difference of the two feeder lines, so that the power point setting module can ensure that the power point setting module smoothly enters a synchronization state when in a loop line to realize presynchronization, and no power is transmitted between the feeder lines in the presynchronization mode; in the loop line operation mode of the distribution network based on the power electronic transformer, the power point setting module outputs the difference between the output power of the power electronic transformer and a power reference value, the power reference value is determined by the actual condition of the distribution network and the power flow regulation requirement, and at the moment, the bus switch can be effectively closed, and the power transmission between feeder lines is controlled by the power electronic transformer.
Further, as a preferred scheme of the present invention, the output of the power synchronization module may be used as a voltage reference value of the voltage control module, and the voltage control module may implement zero static difference tracking of the voltage by using controllers such as proportional integral control, proportional resonance control or repetition control according to the selected reference coordinate system, i.e. synchronous coordinate system (dq coordinate system) and stationary coordinate system (αβ coordinate system).
The invention has the beneficial effects that:
1. the loop running method has simple control structure and easy parameter adjustment, and can flexibly and undisturbed switch between the two power grid topologies of the radiation type power grid and the loop running;
2. the loop line operation method comprises a pre-synchronous working mode of the power electronic transformer and other feeder lines, and the voltage synchronization of the two feeder lines is realized by controlling the voltage of the low-voltage side of the power electronic transformer, so that the small disturbance of the voltage and the current at the moment of closing a bus switch is ensured, the switching process of a radiation type power grid to a loop network is smooth, and the instability of the system caused by transient impact is avoided;
3. according to the loop running method, when the loop running mode of the power distribution network based on the power electronic transformer is adopted, the transmission power of the power electronic transformer can be regulated through the power point setting module and the power synchronization module, the power interaction is realized through the bus switch, and the power flow of the power distribution network is balanced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a diagram of an exemplary system configuration of the present invention;
fig. 2 is a control block diagram of a low-side inverter of the power electronic transformer of the present invention;
fig. 3 is a control block diagram of the power synchronization module of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Referring to fig. 1, fig. 1 is a schematic diagram of a typical system configuration of a loop running method based on a power distribution network of a power electronic transformer, which includes a medium voltage ac bus and a medium voltage ac power grid (1), a power electronic transformer (2), a filtering device (3), a conventional transformer (4), a low voltage ac bus and a low voltage ac power grid (5), various ac devices or loads (6), and a bus switch (7).
The power electronic transformer (2) is formed by cascading an AC/DC rectifier (2-1), an isolated DC/DC converter (2-2) and a DC/AC inverter (2-3), wherein the AC/DC rectifier (2-1) is connected with a medium-voltage alternating current bus (1), and the DC/AC inverter (2-3) is connected with a low-voltage alternating current bus (5).
The primary side and the secondary side of the traditional transformer (4) are respectively connected with a medium-voltage alternating current bus (1) and a low-voltage alternating current bus (5). The ac installation and the load (6) are connected to a low-voltage ac network (5).
The direct current side of the power electronic transformer (2) is connected with a large capacitor, direct current ripple is reduced, the low-voltage side of the power electronic transformer (2) is connected with the filter equipment (3), and the filter equipment such as LC type filter equipment is generally adopted to eliminate higher harmonics in low-voltage side voltage.
The bus switches (7) are usually two, one is connected between two alternating current buses, the other is connected to the tail ends of two feeder lines, and one bus switch (7) needs to be closed based on the loop line operation mode of the power electronic transformer distribution network.
Fig. 2 is a control block diagram of a low-voltage side inverter of the power electronic transformer, which includes a phase detection module (8), a phase difference calculation module (9), a power point setting module (10), a power synchronization module (11), a voltage control module (12), and a Pulse Width Modulation (PWM) module (13).
The low-voltage side DC/AC inverter (2-3) of the power electronic transformer is driven by a switching signal generated by a pulse width modulation module (13) to generate a required voltage waveform, and the input voltage of the pulse width modulation module (13) is obtained by the loop line operation method provided by the invention.
The phase detection module (8) measures the amplitude and the phase of the feeder voltage connected with the traditional transformer (4) in real time, the phase difference calculation module (9) compares the measured value of the phase detection module (8) with the output value of the power synchronization module (11) to obtain the amplitude and the phase difference of the two feeder voltages connected with the power electronic transformer (2) and the traditional transformer (4), and normally the output signal of the phase difference calculation module (9) can adopt a low-pass filter to filter noise and disturbance.
The voltage control module (12) takes the output of the power synchronization module (11) as a reference value, a double-loop control scheme of a voltage outer loop and a voltage inner loop can be adopted, and controllers such as proportional integral control, proportional resonance control or repeated control can be adopted according to a selected reference coordinate system to realize zero static difference tracking of the voltage.
According to different working modes, the power point setting module (10) outputs different power reference values:
in the radiation type power grid independent operation mode, the output value of the power point setting module (10) is zero;
in a presynchronization mode of the power electronic transformer and other feeder lines, the output value of the power point setting module (10) is obtained by calculating the voltage amplitude and the phase difference of the phase difference calculation module (9);
in a power electronic transformer based distribution network loop line operation mode, the output value of the power point setting module (10) is determined by power transmission and power flow regulation requirements of a power grid.
The power reference value output by the power point setting module (10) is used as the input value of the power synchronization module (11), as shown in fig. 3, which is a control block diagram of the power synchronization module (11).
The three modes of operation according to the invention are explained in detail below:
in the radiation type power grid independent operation mode, a feeder line connected with a power electronic transformer (2) and a feeder line connected with a traditional transformer (4) respectively and independently operate, at the moment, a bus switch (7) is opened, the output power of a power point setting module (10) and the input of a power synchronization module (11) are both zero, the reference value of a voltage control module (12) is rated voltage amplitude and frequency, for example, 220V/50Hz, and no power is transmitted between the feeder lines.
When the power electronic transformer (2) or the traditional transformer (4) is overloaded or needs maintenance, loop operation can be realized by closing the bus switch (7), wherein the loop operation comprises a power electronic transformer pre-synchronization mode with other feeder lines and a loop operation mode based on the power electronic transformer distribution network, wherein in the power electronic transformer pre-synchronization mode with other feeder lines, the bus switch (7) usually receives a pre-synchronization signal, but is still in an open state, the output reference value of the power point setting module (10) is obtained according to the voltage amplitude and the phase difference calculation of the phase difference calculation module (9), and the active power reference value is approximately proportional to the phase difference and the reactive power reference value is approximately proportional to the line voltage amplitude by taking an inductive line as an example. The power reference value is input into a power synchronization module (11) to adjust the amplitude and the phase angle of the voltage at the low-voltage side of the power electronic transformer until the amplitude and the phase difference in a phase difference calculation module (9) become zero, so that the synchronization of the voltages of two feeder lines is realized, and no power transmission exists between the two feeder lines.
After presynchronization is finished, the bus switch (7) receives signals and completes switch closing, and as amplitude and phase between feeder lines are zero, the switch closing instant voltage and current disturbance is small, the radiation type power grid stably transits to the ring network, and system instability cannot be caused. In a loop line operation mode of a power distribution network based on a power electronic transformer, a bus switch (7) is in a closed state, power transmission exists between two feeder lines, power is regulated by a DC/AC inverter (2-3) at a low voltage side of the power electronic transformer, a power reference value following power transmission is realized through a power synchronization module (11), and a power point setting module (10) can reasonably set the power reference value according to the requirements of a dispatching center, the actual rate transmission of the power distribution network and the power flow regulation requirement at the stage, so that power regulation and power flow optimization of the power distribution network are realized.
The power reference value adopted in the presynchronization mode of the power electronic transformer and other feeder lines is virtual power, the power reference value is not related to actual power transmission, the actual power flow of a power grid cannot be influenced, and the speed of the presynchronization process is determined by the virtual power value and related parameters.
In the power distribution network loop running mode of the power electronic transformer, power transmission is bidirectional, and the adopted power reference value can be positive or negative, so that the direction of actual power transmission at the bus switch (7) is determined.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (2)
1. The loop running method based on the power electronic transformer distribution network is characterized by comprising a phase detection module (8), a phase difference calculation module (9), a power point setting module (10), a power synchronization module (11), a voltage control module (12) and a pulse width modulation module (13);
the phase detection module (8) detects the amplitude and the phase of the alternating voltage of the feeder line, the phase difference calculation module (9) calculates the voltage phase difference between the feeder line and other feeder lines of the power electronic transformer, the power point setting module (10) and the power synchronization module (11) obtain an alternating voltage reference value output by the low-voltage side inverter of the power electronic transformer according to the current running state of the power grid, the voltage control module (12) outputs a modulation wave to the pulse width modulation module (13) according to the voltage reference value, and the pulse width modulation module (13) drives the low-voltage side inverter of the power electronic transformer according to a modulation wave output switching signal;
the power point setting module (10) outputs different power reference values according to different working modes, and the loop running method is divided into three working modes: the power distribution network comprises a radiation type power grid independent operation mode, a power electronic transformer and other feeder line presynchronization mode and a power electronic transformer-based power distribution network loop line operation mode;
the radiation type power grid independent operation mode, the bus switch (7) is disconnected when the power electronic transformer is in a presynchronization mode with other feeder lines, and the bus switch (7) is in a closed state when the power electronic transformer is in a loop line operation mode;
the power synchronization module (11) obtains reference values of amplitude, frequency and phase of alternating voltage output by the power electronic transformer according to the active power reference value and the reactive power reference value output by the power point setting module (10);
the power point setting module (10) outputs a proper power reference value according to a power grid operation mode;
when the radiation type power grid operates in an independent mode, the output value of the power point setting module (10) is zero, and the transmission power between feed lines is zero;
when the power electronic transformer and other feeder lines are in a presynchronization mode, the output value of the power point setting module (10) is virtual power so as to realize presynchronization, and the transmission power between the feeder lines is zero;
when the power distribution network is in a loop line operation mode based on the power electronic transformer, the output value of the power point setting module (10) is the difference between the output power of the power electronic transformer and the power reference value and is the same as the actual transmission power between the power supply lines, so that the power flow regulation of the power distribution network is realized.
2. The method of claim 1, wherein the active power reference or the reactive power reference is zero, the power electronic transformer voltage reference and the frequency reference are rated values, and are not synchronized with other feeders.
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| CN202110668522.9A CN113300369B (en) | 2021-06-16 | 2021-06-16 | Loop line operation method based on power electronic transformer distribution network |
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| CN202110668522.9A CN113300369B (en) | 2021-06-16 | 2021-06-16 | Loop line operation method based on power electronic transformer distribution network |
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| CN113991729A (en) * | 2021-12-03 | 2022-01-28 | 南方电网科学研究院有限责任公司 | Flexible direct-current power transmission system and synchronous control method and equipment for operation of flexible direct-current power transmission system |
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| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| CN105429174A (en) * | 2015-11-27 | 2016-03-23 | 云南电网有限责任公司电力科学研究院 | Synchronous inverter controller and pre-synchronous grid connection method therefor |
| CN109193746A (en) * | 2018-10-26 | 2019-01-11 | 贵州电网有限责任公司 | A kind of virtual synchronous generator seamless handover method based on DC distribution center |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| CN105429174A (en) * | 2015-11-27 | 2016-03-23 | 云南电网有限责任公司电力科学研究院 | Synchronous inverter controller and pre-synchronous grid connection method therefor |
| CN109193746A (en) * | 2018-10-26 | 2019-01-11 | 贵州电网有限责任公司 | A kind of virtual synchronous generator seamless handover method based on DC distribution center |
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