CN107154630B - Hybrid power electronic transformer substation - Google Patents
Hybrid power electronic transformer substation Download PDFInfo
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- CN107154630B CN107154630B CN201710542410.2A CN201710542410A CN107154630B CN 107154630 B CN107154630 B CN 107154630B CN 201710542410 A CN201710542410 A CN 201710542410A CN 107154630 B CN107154630 B CN 107154630B
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H02J13/0079—
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention relates to a hybrid power electronic transformer substation, which is characterized in that: it comprises a primary system; the primary system comprises a hybrid power electronic transformer and a transformer substation switching device; the high-voltage side of the hybrid power electronic transformer is connected with the inlet wire of an upper-layer power grid through a high-voltage alternating current bus, the low-voltage side of the hybrid power electronic transformer is divided into a traditional low-voltage alternating current outlet, a customized low-voltage alternating current outlet and a low-voltage direct current outlet, the traditional low-voltage alternating current outlet is connected with the input side of the traditional low-voltage alternating current bus, the customized low-voltage alternating current outlet is connected with the customized low-voltage alternating current bus, the low-voltage direct current outlet is connected with the low-voltage direct current bus, and each low-voltage bus is respectively connected with various alternating current and direct current load. The invention can be widely applied to the construction of power electronic transformer substations.
Description
Technical Field
The invention relates to the field of planning and designing of a substation in a power distribution network, in particular to a hybrid power electronic substation.
Background
With the increase of direct current electric equipment such as a data center, a computer and a microprocessor, communication system equipment, an intelligent terminal, a sensor and a sensing network on a user side, a power battery of an electric automobile, semiconductor illumination and the like, the improvement of the electric energy quality requirement of alternating current sensitive loads (mainly referring to electric equipment such as a personal computer, a programmable logic device, a speed-adjustable driving device, an alternating current contactor, a high-pressure gas discharge lamp, a fine machining automatic device or a complex machine for cutting, drilling, metal processing and the like) and the wide application of various distributed renewable energy power generation (biomass energy, wind energy, water energy, solar energy and the like) and energy storage equipment, a power distribution network is also changed into a power supply mode needing to be connected with distributed power generation and power output by simply inputting alternating current of an upper power transmission network in the past and outputting alternating current to the user side, The device comprises an electric automobile, an energy storage device and the like, and provides a complex power allocation mode of customized power for an alternating current sensitive user, so that an alternating current and direct current hybrid power distribution network is formed. However, since the conventional ac distribution network cannot provide the new power consumer with the dc input/output interface and the high quality power, the new power consumer has to install the commutation or filtering device at the connection with the distribution network. The commutating or filtering devices which are operated dispersedly to meet the individual requirements of users on electricity consumption have the problems of low overall efficiency and difficulty in regulating and controlling the commutating or filtering devices by a power distribution network.
When a novel transformation device (with the function of converting current) and a diversified connection mode are adopted in the substation, alternating current and direct current can be provided for power users, and the most important thing is that the substation can be controlled by a power distribution network control center. This will improve whole operation level and safety and stability on the distribution network aspect greatly, satisfy the convenient friendly demand of electric power user's aspect customization electric power and access simultaneously. For this reason, power electronic substations designed by previous concepts are gradually advancing in the direction of demonstration projects. The core equipment in the power electronic transformer substation, namely the power electronic transformer, adopts an AC/DC/AC/DC/AC five-level conversion topology, and the manufacturing cost is very expensive. This is a problem that has to be considered seriously for a commercial operating power company.
It should be noted that there is in fact a great diversity between the power supply or access requirements of the vast power consumers. The main manifestation is that new power consumers want the distribution network to provide high-quality power or a convenient direct current interface, but most of the traditional power consumers still use traditional alternating current. In this case, if the distribution network is a common use of expensive power electronic transformers in substations, it is possible to provide high-quality electrical energy or convenient dc input/output interfaces for some new power consumers. But the higher equipment cost will affect the electricity price level, which may result in the general increase of electricity consumption. This is highly unreasonable for conventional power consumers without special electricity usage needs. For the electric power company, the economy of the construction of the power electronic transformer substation is questioned.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a hybrid power electronic substation, which can provide different interfaces and high-quality electric energy for users with diverse power requirements, and ensure that the investment construction of the substation in a power distribution network conforms to the idea of commercial operation.
In order to achieve the purpose, the invention adopts the following technical scheme: a hybrid power electronic transformer substation is characterized in that: it comprises a primary system; the primary system comprises a hybrid power electronic transformer and a transformer substation switching device consisting of a plurality of circuit breakers and isolating switches; the high-voltage side of the hybrid power electronic transformer is connected with the inlet wire of the upper-layer power grid through a high-voltage alternating-current bus, and the low-voltage side of the hybrid power electronic transformer is connected with various alternating-current and direct-current load outlet wires and direct-current input and output interfaces through a low-voltage bus; the low-voltage bus comprises a traditional low-voltage alternating-current bus, a customized low-voltage alternating-current bus and a low-voltage direct-current bus, the input side of the traditional low-voltage alternating-current bus is connected with a traditional low-voltage alternating-current outlet of the hybrid power electronic transformer, and the output side of the traditional low-voltage alternating-current bus is connected with traditional low-voltage alternating-current load outgoing lines which are connected in parallel; the input side of the customized low-voltage alternating current bus is connected with a customized low-voltage alternating current outlet of the hybrid power electronic transformer, and the output side of the customized low-voltage alternating current bus is connected with each customized low-voltage alternating current load outlet wire connected in parallel; and the input side of the low-voltage direct-current bus is connected with the low-voltage direct-current outlet of the hybrid power electronic transformer, and the output side of the low-voltage direct-current bus is connected with each low-voltage direct-current load outlet and each direct-current input/output interface which are connected in parallel.
The hybrid power electronic transformer comprises a conventional transformer and a current transformer; and the traditional transformer and the current transformer adopt the same secondary winding form or respectively adopt independent secondary winding forms.
The adoption of the same secondary winding form means that: the traditional transformer and the current converter adopt the same secondary winding; that is, the primary side of the conventional transformer is connected to an ac power supply to form a primary side ac current, and the primary side ac current forms a secondary side output ac voltage V on the secondary side of the conventional transformerout1As a conventional low voltage ac outlet of the hybrid power electronic transformer; the AC power used by the AC/DC converter in the converter is directly obtained from the secondary side of the conventional transformer, and the AC/DC converter outputs the AC voltage V at the secondary sideout1Conversion to low voltage dc Vout2The low-voltage direct current outlet is used as a low-voltage direct current outlet of the hybrid power electronic transformer; the DC/AC converter in the converter obtains low-voltage direct current V from the output end of the AC/DC converterout2Conversion to a customized low voltage alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer.
The independent secondary winding form is adopted, namely: the traditional transformer and the current converter respectively adopt different secondary windings; the primary side of the traditional transformer is connected with an alternating current power supply to form a primary side alternating current, and the primary side alternating current forms a secondary side output alternating current voltage V on the secondary side of the traditional transformerout1As a conventional low voltage ac outlet of the hybrid power electronic transformer; the primary side alternating current forms a secondary side output on a secondary side winding of the converterAC voltage V'out1The AC/DC converter in the converter outputs AC voltage V 'at the secondary side'out1Conversion to low voltage dc Vout2The low-voltage direct current outlet is used as a low-voltage direct current outlet of the hybrid power electronic transformer; the direct current used by the DC/AC converter in the converter is obtained from the output end of the AC/DC converter, and low-voltage direct current V is obtainedout2Conversion into low-voltage sensitive alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer.
The transformer substation also comprises a transformer substation automation system, and the transformer substation automation system is used for controlling all the equipment in the whole substation.
The transformer substation switching device comprises a plurality of circuit breakers and a plurality of isolating switches arranged at two ends of each circuit breaker, wherein each circuit breaker and each isolating switch are connected with the transformer substation automation system through signal lines and controlled by the transformer substation automation system.
The circuit breakers comprise two high-voltage alternating-current circuit breakers, a plurality of low-voltage alternating-current circuit breakers and a plurality of low-voltage direct-current circuit breakers, wherein the two high-voltage alternating-current circuit breakers are respectively arranged at the connection position of the high-voltage alternating-current bus and the inlet wire of the upper power grid and the connection position of the high-voltage alternating-current bus and the input side of the hybrid power electronic transformer; each low-voltage alternating-current circuit breaker is respectively arranged at the connection position of a traditional low-voltage alternating-current outlet of the traditional low-voltage alternating-current bus and the hybrid power electronic transformer and the outgoing line connection position of each traditional low-voltage alternating-current load, and the connection position of a customized low-voltage alternating-current outlet of the customized low-voltage alternating-current bus and the hybrid power electronic transformer and the outgoing line connection position of each customized low-voltage alternating-current load; and the low-voltage direct-current circuit breakers are respectively arranged at the connection part of the low-voltage direct-current bus and the low-voltage direct-current outlet of the hybrid power electronic transformer and the connection part of the low-voltage direct-current load outlet and the direct-current input/output interfaces.
The traditional low-voltage alternating-current bus is also connected with an on-site measuring and controlling device, and the on-site measuring and controlling device comprises an inductive current-limiting reactor and a reactive compensator which are connected in series and used for limiting fault current and ensuring the voltage level on the traditional low-voltage alternating-current bus.
The low-voltage direct-current input and output interface connected with the output side of the low-voltage direct-current bus comprises a wind power generation and photovoltaic power generation incoming line interface, an electric automobile, an energy storage device or other corresponding equipment incoming/outgoing line interfaces with power generation and power utilization bidirectional characteristics.
And the other end of each customized low-voltage alternating-current load outlet wire connected with the output side of the customized low-voltage alternating-current bus respectively provides customized electric power with each alternating-current sensitive user.
Due to the adoption of the technical scheme, the invention has the following advantages: 1) according to the invention, the hybrid power electronic transformer is formed by adopting the traditional transformer and the converter, the traditional transformer is used for converting the upper-layer high-voltage alternating current into the traditional low-voltage alternating current, and the converter is used for converting the traditional low-voltage alternating current into the low-voltage direct current or the customized low-voltage alternating current, so that the power consumption requirements of various power users can be met at the same time. 2) According to the invention, the hybrid power electronic transformer substation can directly provide the required traditional low-voltage alternating current, the customized low-voltage alternating current or the direct current for various power users, and other current conversion or filtering equipment is not required to be adopted when power is supplied to various power users, all equipment in the transformer substation can be uniformly controlled by the transformer substation automation system, so that the operation flexibility and controllability of the power electronic transformer substation are greatly improved, and the problems of low overall efficiency and difficulty in regulation and control of a power distribution network caused by the access of the current conversion or filtering equipment in the prior art are solved. 3) The hybrid power electronic transformer consists of the traditional transformer and the converter, and the traditional transformer, the converter and other equipment pass long-term operation tests, so that the hybrid power electronic transformer has high reliability, low price and good performance, and effectively reduces the construction cost of a transformer substation system. Therefore, the invention can be widely applied to the construction of power electronic transformer substations.
Drawings
FIG. 1 is a main wiring diagram of a hybrid power electronic substation of the present invention;
FIG. 2(a) is a schematic diagram of a hybrid power electronic transformer of the present invention in the form of a common secondary winding;
FIG. 2(b) is a schematic diagram of a hybrid power electronic transformer of the present invention in the form of an independent secondary winding;
fig. 3 is a structural diagram of a control system of a hybrid power electronic substation according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the hybrid power electronic substation of the present invention includes a primary system; the primary system comprises a hybrid power electronic transformer 1 and a substation switchgear 2 consisting of a number of circuit breakers and disconnectors. The high-voltage side of the hybrid power electronic transformer 1 is connected with an incoming line 4 of an upper-layer power grid through a high-voltage alternating-current bus 3, and the low-voltage side is connected with various alternating-current and direct-current load outgoing lines and various direct-current input and output interfaces through a low-voltage bus 5. The low-voltage bus 5 comprises a traditional low-voltage alternating-current bus 51, a customized low-voltage alternating-current bus 52 and a low-voltage direct-current bus 53, the input side of the traditional low-voltage alternating-current bus 51 is connected with a traditional low-voltage alternating-current outlet of the hybrid power electronic transformer 1, and the output side of the traditional low-voltage alternating-current bus is connected with each parallel traditional low-voltage alternating-current load outlet 6; the input side of the customized low-voltage alternating current bus 52 is connected with a customized low-voltage alternating current outlet of the hybrid power electronic transformer 1, and the output side is connected with each customized low-voltage alternating current load outlet 7 which is connected in parallel; the input side of the low-voltage direct current bus 53 is connected with the low-voltage direct current outlet of the hybrid power electronic transformer 1, and the output side is connected with each low-voltage direct current load outlet 8 and each direct current input/output interface 9 which are connected in parallel.
As shown in fig. 2(a) and 2(b), the hybrid power electronic transformer 1 in the primary system includes a conventional transformer and a converter. The conventional transformer and the inverter adopt the same secondary winding form (shown in fig. 2 (a)) or respectively adopt independent secondary winding forms (shown in fig. 2 (b)). Specifically, the same secondary winding form is as follows: the same secondary winding is used for the conventional transformer and the current converter, and the primary side (a in fig. 2 (a)) of the conventional transformer1，a2) With an alternating current source uiConnected to form a primary side alternating current in a conventional transformerSecondary side (b in FIG. 2 (a))1，b2) Upper formed secondary side output AC voltage Vout1As a conventional low voltage ac outlet for a hybrid power electronic transformer 1. The converter and the traditional transformer share the same secondary side, namely the AC power supply used by the AC/DC converter in the converter is directly obtained from the secondary side of the traditional transformer, and the AC/DC converter outputs the AC voltage V on the secondary sideout1Conversion to low voltage dc Vout2And serves as a low-voltage direct-current outlet of the hybrid power electronic transformer 1. The DC used by the DC/AC converter in the converter is obtained from the output end of the AC/DC converter, and the low-voltage DC V is obtainedout2Conversion to a customized low voltage alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer 1.
The independent secondary winding form is as follows: the traditional transformer and the current converter respectively adopt different secondary windings, and the primary side of the traditional transformer and the alternating current power supply uiConnected to form a primary side alternating current which forms a secondary side output alternating voltage V on a secondary winding of the conventional transformerout1As a conventional low voltage ac outlet for a hybrid power electronic transformer 1. The primary side alternating current is in the secondary winding (c in fig. 2 (b)) of the converter1，c2) On form a secondary side output AC voltage V'out1The AC/DC converter in the converter outputs AC voltage V 'at the secondary side'out1Conversion to low voltage dc Vout2And serves as a low-voltage direct-current outlet of the hybrid power electronic transformer 1. The DC used by the DC/AC converter in the converter is obtained from the output end of the AC/DC converter, and the low-voltage DC V is obtainedout2Conversion to a customized low voltage alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer 1.
The substation switch device 2 includes a plurality of circuit breakers 21 and a plurality of disconnecting switches 22 arranged at two ends of each circuit breaker 21, and each circuit breaker 21 and each disconnecting switch 22 are connected with the substation automation system through signal lines and controlled by the substation automation system. The circuit breaker 21 comprises two high-voltage alternating-current circuit breakers 211, a plurality of low-voltage alternating-current circuit breakers 212 and a plurality of low-voltage direct-current circuit breakers 213, wherein the two high-voltage alternating-current circuit breakers 211 are respectively arranged at the connection position of a high-voltage alternating-current bus 3 and an upper-layer power grid inlet wire 4 and the connection position of the high-voltage alternating-current bus 211 and the input side of the hybrid power electronic transformer 1; each low-voltage alternating-current circuit breaker 212 is respectively arranged at the connection position of the traditional low-voltage alternating-current bus 51 and the traditional low-voltage alternating-current outlet of the hybrid power electronic transformer 1 and the connection position of each traditional low-voltage alternating-current load outlet 6, and the connection position of the customized low-voltage alternating-current bus 52 and the customized low-voltage alternating-current outlet of the hybrid power electronic transformer 1 and the connection position of each customized low-voltage alternating-current load outlet 7; the low-voltage dc breakers 213 are respectively disposed at the connection between the low-voltage dc bus 53 and the low-voltage dc outlet of the hybrid power electronic transformer 1, and at the connection between the low-voltage dc load outlets 8 and the dc input/output interfaces 9.
As shown in fig. 3, the hybrid power electronic substation of the present invention further includes a substation automation system for controlling all devices in the substation. The design of the transformer substation automatic system refers to a design method of a traditional transformer substation automatic system, and the transformer substation automatic system comprises a transformer substation scheduling layer (a station control layer), an inter-equipment coordination protective layer (a spacer layer/a unit layer) and a single-equipment control protective layer (a process layer), wherein all the layers are in bidirectional communication and are in mutual coordination. And the substation scheduling layer is used for monitoring and controlling all controlled equipment in the substation and communicating with the scheduling center. The inter-equipment coordination protection layer is used for carrying out on-site monitoring and control on all controlled equipment in the interval and coordinating and controlling with the substation scheduling layer. The single equipment control protective layer is used for carrying out data acquisition, automatic monitoring and control on the controlled equipment of the process layer and coordinating and controlling the protective layer with the equipment. The controlled equipment comprises a hybrid power electronic transformer, various alternating current/direct current circuit breakers, isolating switches, inductive current-limiting reactors, reactive compensation capacitors, electric automobiles, energy storage equipment, wind power generation, photovoltaic power generation interfaces and the like.
In the above embodiment, the conventional low-voltage ac bus 51 is further connected with an in-situ measurement and control device, and the in-situ measurement and control device includes an inductive current-limiting reactor and a reactive compensator which are connected in series to limit the fault current and ensure the voltage level on the conventional low-voltage ac bus.
In the above embodiments, the low-voltage dc input/output interface 9 connected to the output side of the low-voltage dc bus 53 includes a wind power generation and photovoltaic power generation incoming interface, and an incoming/outgoing interface of an electric vehicle, an energy storage device, or other corresponding devices with bidirectional characteristics of power generation and power utilization.
When the hybrid power electronic transformer is used, high-voltage alternating current transmitted from an upper-layer power grid enters the high-voltage side of the hybrid power electronic transformer in a primary system through the high-voltage alternating current bus by the incoming line.
The hybrid power electronic transformer 1 has two functions, namely, a conventional alternating current transformation for converting alternating current from high voltage to low voltage, and an additional current converter for converting alternating current to direct current and further converting direct current to alternating current on the basis of the transformation. The converter is a conversion circuit composed of power electronic devices IGBT, and the control of the converter is realized by pulse-width modulation (PWM), so that the output direct current and alternating current can be ensured, the specified requirements such as ripple voltage, harmonic content and the like can be met, and the converter has power flow control and electric energy quality regulation capabilities.
The invention is described by taking the same secondary winding form as an example, and the traditional transformer in the hybrid power electronic transformer firstly reduces the high-voltage alternating current to the low-voltage alternating current Vout1And then the low-voltage alternating current is divided into two paths, one path is used as a traditional low-voltage alternating current outlet, and traditional low-voltage alternating current is provided for various traditional low-voltage loads through a traditional low-voltage alternating current bus. The other low-voltage alternating current completes the AC/DC/AC conversion through the converter, and the high-quality customized low-voltage alternating current, namely V, is output from the alternating current side of the converterout3And the customized low-voltage AC outlet is used as a customized low-voltage AC outlet, and customized alternating current is provided for various customized low-voltage AC loads through a customized low-voltage AC bus. Outputting low voltage DC, i.e. V, from the DC side of the converterout2And the low-voltage direct current bus is used as a low-voltage direct current outlet and is connected with various direct current loads or direct current interface equipment through a low-voltage direct current bus.
The substation automation system monitors all controlled equipment in the substation, transmits monitoring information through layered control in a communication mode (such as an optical fiber or a local area network) in the substation, and finally implements control according to a proposed control protection strategy, so that the reliability and flexibility of the operation of the whole substation are ensured. When the transformer substation is in fault or overhauled, the automatic system of the transformer substation controls and switches the circuit breaker 21 and the isolating switch 22 in the switch device 2 of the transformer substation, and further cuts off the electrical connection between the transformer substation and a higher-level power grid, or between the hybrid power electronic transformer 1 and the high-voltage alternating-current bus 3 and each low-voltage bus 5, or between all connection objects on the low-voltage side and the transformer substation, so as to ensure the operation safety in the transformer substation. Considering the factors of electrical safety, when the circuit breaker is disconnected, the disconnecting switches on the two sides must act to form a physically obvious disconnection point so as to ensure the personal safety of operation and maintenance personnel.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (5)
1. A hybrid power electronic transformer substation is characterized in that: it comprises a primary system; the primary system comprises a hybrid power electronic transformer and a transformer substation switching device consisting of a plurality of circuit breakers and isolating switches;
the high-voltage side of the hybrid power electronic transformer is connected with the inlet wire of the upper-layer power grid through a high-voltage alternating-current bus, and the low-voltage side of the hybrid power electronic transformer is connected with various alternating-current and direct-current load outlet wires and direct-current input and output interfaces through a low-voltage bus; the low-voltage bus comprises a traditional low-voltage alternating-current bus, a customized low-voltage alternating-current bus and a low-voltage direct-current bus, the input side of the traditional low-voltage alternating-current bus is connected with a traditional low-voltage alternating-current outlet of the hybrid power electronic transformer, and the output side of the traditional low-voltage alternating-current bus is connected with traditional low-voltage alternating-current load outgoing lines which are connected in parallel; the input side of the customized low-voltage alternating current bus is connected with a customized low-voltage alternating current outlet of the hybrid power electronic transformer, and the output side of the customized low-voltage alternating current bus is connected with each customized low-voltage alternating current load outlet wire connected in parallel; the input side of the low-voltage direct-current bus is connected with the low-voltage direct-current outlet of the hybrid power electronic transformer, and the output side of the low-voltage direct-current bus is connected with each low-voltage direct-current load outlet and each direct-current input/output interface which are connected in parallel;
the hybrid power electronic transformer comprises a conventional transformer and a current transformer; the traditional transformer and the converter adopt the same secondary winding form or respectively adopt independent secondary winding forms;
the adoption of the same secondary winding form means that: the traditional transformer and the current converter adopt the same secondary winding; that is, the primary side of the conventional transformer is connected to an ac power supply to form a primary side ac current, and the primary side ac current forms a secondary side output ac voltage V on the secondary side of the conventional transformerout1As a conventional low voltage ac outlet of the hybrid power electronic transformer; the AC power used by the AC/DC converter in the converter is directly obtained from the secondary side of the conventional transformer, and the AC/DC converter outputs the AC voltage V at the secondary sideout1Conversion to low voltage dc Vout2The low-voltage direct current outlet is used as a low-voltage direct current outlet of the hybrid power electronic transformer; the DC/AC converter in the converter obtains low-voltage direct current V from the output end of the AC/DC converterout2Conversion to a customized low voltage alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer;
the independent secondary winding form is adopted, namely: the traditional transformer and the current converter respectively adopt different secondary windings; the primary side of the traditional transformer is connected with an alternating current power supply to form a primary side alternating current, and the primary side alternating current forms a secondary side output alternating current voltage V on the secondary side of the traditional transformerout1As a conventional low voltage ac outlet of the hybrid power electronic transformer; the primary side alternating current forms a secondary side output alternating current voltage V 'on a secondary side winding of the converter'out1The AC/DC converter in the converter outputs AC voltage V 'at the secondary side'out1Conversion to low voltage dc Vout2As the mixed typeA low voltage DC outlet of the power electronic transformer; the direct current used by the DC/AC converter in the converter is obtained from the output end of the AC/DC converter, and low-voltage direct current V is obtainedout2Conversion into low-voltage sensitive alternating current Vout3As a custom low voltage ac outlet for the hybrid power electronic transformer;
the other end of each customized low-voltage alternating-current load outlet wire connected with the output side of the customized low-voltage alternating-current bus provides customized electric power with each alternating-current sensitive user;
the transformer substation also comprises a transformer substation automation system, and the transformer substation automation system is used for controlling all the equipment in the whole substation.
2. A hybrid power electronic substation according to claim 1, characterized in that: the transformer substation switching device comprises a plurality of circuit breakers and a plurality of isolating switches arranged at two ends of each circuit breaker, wherein each circuit breaker and each isolating switch are connected with the transformer substation automation system through signal lines and controlled by the transformer substation automation system.
3. A hybrid power electronic substation according to claim 2, characterized in that: the circuit breakers comprise two high-voltage alternating-current circuit breakers, a plurality of low-voltage alternating-current circuit breakers and a plurality of low-voltage direct-current circuit breakers, wherein the two high-voltage alternating-current circuit breakers are respectively arranged at the connection position of the high-voltage alternating-current bus and the inlet wire of the upper power grid and the connection position of the high-voltage alternating-current bus and the input side of the hybrid power electronic transformer; each low-voltage alternating-current circuit breaker is respectively arranged at the connection position of a traditional low-voltage alternating-current outlet of the traditional low-voltage alternating-current bus and the hybrid power electronic transformer and the outgoing line connection position of each traditional low-voltage alternating-current load, and the connection position of a customized low-voltage alternating-current outlet of the customized low-voltage alternating-current bus and the hybrid power electronic transformer and the outgoing line connection position of each customized low-voltage alternating-current load; and the low-voltage direct-current circuit breakers are respectively arranged at the connection part of the low-voltage direct-current bus and the low-voltage direct-current outlet of the hybrid power electronic transformer and the connection part of the low-voltage direct-current load outlet and the direct-current input/output interfaces.
4. A hybrid power electronic substation according to claim 1, characterized in that: the traditional low-voltage alternating-current bus is also connected with an on-site measuring and controlling device, and the on-site measuring and controlling device comprises an inductive current-limiting reactor and a reactive compensator which are connected in series and used for limiting fault current and ensuring the voltage level on the traditional low-voltage alternating-current bus.
5. A hybrid power electronic substation according to claim 1, characterized in that: the low-voltage direct-current input and output interface connected with the output side of the low-voltage direct-current bus comprises a wind power generation and photovoltaic power generation incoming line interface, an electric automobile, an energy storage device or other corresponding equipment incoming/outgoing line interfaces with power generation and power utilization bidirectional characteristics.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710542410.2A CN107154630B (en) | 2017-07-05 | 2017-07-05 | Hybrid power electronic transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710542410.2A CN107154630B (en) | 2017-07-05 | 2017-07-05 | Hybrid power electronic transformer substation |
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| CN108365606B (en) * | 2018-03-30 | 2024-04-09 | 广东电网有限责任公司东莞供电局 | Topological structure of power electronic transformer |
| CN109193659A (en) * | 2018-10-18 | 2019-01-11 | 全球能源互联网研究院有限公司 | A kind of mesolow alternating current-direct current mixing network system based on PET |
| CN113472218A (en) * | 2021-08-06 | 2021-10-01 | 华北电力大学 | Hybrid power electronic transformer and energy storage and voltage compensation method thereof |
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| US7466565B2 (en) * | 2005-06-30 | 2008-12-16 | Tdk Corporation | Switching power supply unit and voltage detection circuit |
| WO2012037965A1 (en) * | 2010-09-21 | 2012-03-29 | Abb Technology Ag | An apparatus for controlling the electric power transmission in a hvdc power transmission system |
| CN103138171B (en) * | 2013-02-08 | 2016-01-20 | 国家电网公司 | A kind of power electronic transformer substation |
| EP2869420A1 (en) * | 2013-10-31 | 2015-05-06 | Siemens Aktiengesellschaft | Power system for a floating vessel |
| CN104143775B (en) * | 2014-08-18 | 2016-04-20 | 国家电网公司 | A kind of power electronic transformer substation |
| CN104578132B (en) * | 2015-01-29 | 2018-01-19 | 国家电网公司 | A kind of electric power concentrator system of alternating current-direct current micro-capacitance sensor |
| CN104767212B (en) * | 2015-02-13 | 2017-01-11 | 国家电网公司 | Hybrid power electronic transformer |
| CN105591548A (en) * | 2015-12-31 | 2016-05-18 | 西安交通大学 | Self-balance type power electronic transformer based on multiport high-frequency transformer |
| CN106655805A (en) * | 2017-03-10 | 2017-05-10 | 贵州电网有限责任公司电力科学研究院 | MMC-based multi-port hybrid power electronic transformer and control method thereof |
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