CN103607032A - Renewable energy generating, power transmission and transformation and electrical network access integrated system - Google Patents
Renewable energy generating, power transmission and transformation and electrical network access integrated system Download PDFInfo
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- CN103607032A CN103607032A CN201310589012.8A CN201310589012A CN103607032A CN 103607032 A CN103607032 A CN 103607032A CN 201310589012 A CN201310589012 A CN 201310589012A CN 103607032 A CN103607032 A CN 103607032A
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Abstract
The invention relates to a renewable energy generating, power transmission and transformation and electrical network access integrated system, for the purpose of providing an access system capable of preventing impact or trawlnet caused to an electrical network. The technical scheme is as follows: the integrated system comprises renewable energy integrated generating units, at least one high voltage direct current transmission (HVDC) line, at least one inverter and a power generation field computer monitoring system, wherein the output end of each renewable energy integrated generating unit is connected with a high voltage direct current bus; one end of the HVDC line is connected with the high voltage direct current bus; the other end of the HVDC line is connected with the direct current input end of the large-power inverter; the alternating current output end of the large-power inverter is connected with an alternating current large electrical network; the power generation field computer monitoring system is connected with an electrical network dispatching control center and receives dispatching orders; and the power generation field computer monitoring system is also connected with the renewable energy integrated generating units and gives generating set values.
Description
Technical field
The invention belongs to generation of electricity by new energy, technology of transmission of electricity field, be specifically related to the integral system of a kind of regenerative resource (wind energy, solar energy) generating, unsteady flow, energy storage, transmission of electricity and the large electrical network of incoming transport.
Background technology
Supply shortage along with non-renewable energy resources such as oil, coal, natural gases, and the environmental pollution of using non-renewable energy resources to bring is day by day serious, countries in the world are also more and more paid attention to the development and utilization of the renewable and clean energy resources such as wind energy, solar energy, and the shared proportion of renewable energy power generation also improves rapidly.
(1) wind power generation:
Capturing wind energy, convert electric energy to and mainly by 5 parts, formed by the wind energy turbine set that transmission line is sent into electrical network: 1) wind turbine generator (comprising convertor assembly); 2) wind turbine generator power frequency (50Hz) step-up transformer (the port low-voltage of wind-driven generator is raised to middle pressure: 10KV, 35KV); 3) current collection circuit (wind turbine generator of dispersed placement is generated electricity and can be collected); 4) wind energy turbine set primary substation (voltage is therefrom pressed and continued to be elevated to high pressure: 110KV, 220KV); 5) ultra-high-tension power transmission line.
Although wind power generation is used widely, but still there is following problems: 1) wind-powered electricity generation has significant randomness and intermittence, electricity can be relatively unstable, need to carry out network load balance by the frequent generated output of the generating set (as thermal power generation unit) of other types that regulates, greatly reduced the economy of this class unit operation; 2) low voltage ride-through capability of most of wind-powered electricity generation units is lower, and easy off-grid when large electrical network occurs that short trouble causes system voltage to reduce, causes powerful impact to electrical network, and the safe and stable operation of large electrical network is formed to very large danger; 3) construction cost of marine wind electric field voltage boosting transforming platform is high; 4), owing to being subject to the impact of capacitor charging electric current, at the bottom of high-pressure undersea, ac cable transmission line capability reduces rapidly with the increase of length; 5) have more wind power generation field from exchanging the distant of large electrical network, conveying capacity is very limited at a distance.
(2) solar power generation;
The large grid-connected solar energy power generating of capacity field mainly consists of following 4 parts: 1) solar module (photovoltaic array); 2) photovoltaic DC-to-AC converter (DC/AC inverter becomes alternating current by the DC inverter of solar cell) and power frequency (50Hz) step-up transformer thereof; 3) photovoltaic generation field primary substation (bringing the voltage up to medium-pressure or high pressure: 35KV, 110KV, 220KV); 4) ultra-high-tension power transmission line.
Similar with wind power generation, 1), solar electricity generation field is subject to season, larger with the impact of weather round the clock there is following problems in solar energy power generating:, there is significant randomness and intermittence, electricity can be relatively unstable, need to carry out network load balance by the frequent generated output of the generating set (as thermal power generation unit) of other types that regulates, greatly reduced the economy of this class unit operation; 2), the low voltage ride-through capability of some photovoltaic DC-to-AC converters is lower, easy off-grid when large electrical network occurs that short trouble causes system voltage to reduce, causes powerful impact to electrical network, and the safe and stable operation of large electrical network is formed to very large danger; 3), have more much capacity solar electricity generation fields from exchanging the distant of large electrical network, conveying capacity is very limited at a distance.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes above-mentioned background technology, a kind of renewable energy power generation, power transmission and transformation and electrical network access integral system are provided, the reliability of this connecting system is high, can avoid electrical network to impact or trawlnet, and there is simple in structure, lower-cost feature.
The technical solution used in the present invention is as follows:
Renewable energy power generation, power transmission and transformation and electrical network access integral system, comprise that several regenerative resource integrated power generation unit, at least one HVDC (High Voltage Direct Current) transmission line, at least one high-power inverter and generating field calculate crane monitoring system; It is characterized in that: described in each, the output of regenerative resource integrated power generation unit is connected on high voltage dc bus, one end of HVDC (High Voltage Direct Current) transmission line is also connected on high voltage dc bus HVDC, the other end of HVDC (High Voltage Direct Current) transmission line is connected to the direct-flow input end of high-power inverter, and the ac output end of high-power inverter is connected to and exchanges large electrical network; Generating field calculates the dispatching command that crane monitoring system and dispatching of power netwoks control centre are connected and accept dispatching of power netwoks control centre, and generating field calculating crane monitoring system is also connected with regenerative resource integrated power generation unit and issues generating set point to regenerative resource integrated power generation unit.
Described regenerative resource integrated power generation unit comprises a renewable energy power generation device, a modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, an energy storage device and a cell controller; The output of renewable energy power generation device is connected on low-voltage direct bus LVDC, energy storage device output is also connected on same low-voltage direct bus LVDC, the low-pressure side of modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus is also connected on same low-voltage direct bus LVDC, high-pressure side is connected on the high voltage dc bus HVDC of generating field, and cell controller is connected with renewable energy power generation device, modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device.
Described renewable energy power generation device is at least one photovoltaic battery array, at least one asynchronous wind driven generator with the three-phase based on IGBT module or heterogeneous active PWM rectification circuit, at least one permanent magnet direct-drive wind-force generating machine with rectification circuit, at least one is with at least one in the synchro wind generator of rectification circuit;
The output of photovoltaic battery array is all received on low-voltage direct bus LVDC;
The ac input end of the three-phase that the ac output end of asynchronous wind driven generator is corresponding with asynchronous wind driven generator or heterogeneous active PWM rectification circuit connects, and the DC output end of three-phase or heterogeneous active PWM rectification circuit is connected on low-voltage direct bus LVDC;
The ac input end of the rectification circuit that the ac input end of permanent magnet direct-drive wind-force generating machine is corresponding with permanent magnet direct-drive wind-force generating machine connects, and the DC output end of this rectification circuit is connected on low-voltage direct bus LVDC;
The ac input end of the rectification circuit that the ac output end of synchro wind generator is corresponding with synchro wind generator connects, and the DC output end of this rectification circuit is connected on low-voltage direct bus LVDC;
One of the rectification circuit of described permanent magnet direct-drive wind-force generating machine or the rectification circuit of synchro wind generator are following form:
1) described rectification circuit is diode rectifier circuit;
2) described rectification circuit is that diode rectifier circuit adds Boost circuit;
3) described rectification circuit is that diode rectifier circuit adds pfc circuit;
4) described rectification circuit is three-phase or the heterogeneous active PWM rectification circuit based on IGBT module.
Described cell controller comprises microprocessor unit and connected signal acquisition circuit, communication module; Signal acquisition circuit is connected to gather analog-and digital-variable with described renewable energy power generation device, modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device, and communication module calculates crane monitoring system with described generating field and is connected.
Described energy storage device comprises two-way DC/DC current transformer and a super capacitor system of a non-electromagnetic isolation type, or the two-way DC/DC current transformer of a non-electromagnetic isolation type and a battery system; One end of the two-way DC/DC current transformer of non-electromagnetic isolation type is connected with low-voltage direct bus LVDC, and the other end is connected with battery system or super capacitor system.
The two-way DC/DC current transformer of described non-electromagnetic isolation type comprises a reactor L, capacitor C, two IGBT or MOSFET module T1, T2, two diode D1, D2; Wherein,
IGBT or MOSFET module T1, diode D2, reactor L, capacitor C form a BUCK circuit;
IGBT or MOSFET module T2, diode D1, reactor L, capacitor C form a BOOST circuit.
Described modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus comprises a plurality of identical electromagnetic isolation type DC/DC current transformers, the low-voltage direct bus LVDC receiving after the input parallel connection of all electromagnetic isolation type DC/DC current transformers in regenerative resource integrated power generation unit is upper, after the output series connection of all electromagnetic isolation type DC/DC current transformers or parallel connection, receives on high voltage dc bus HVDC.
One of the structure of described electromagnetic isolation type DC/DC current transformer is following form:
1) described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides rectification circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance L r and capacitor C r, secondary coil more than;
Described high-pressure side rectification circuit consists of the output filter circuit of a diode full bridge rectifier and diode full bridge rectifier DC side, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit;
The secondary coil of the ac input end of each high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
2) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance L r and inductance L m and capacitor C r, high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than;
Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the inductance L m in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer;
The secondary coil of the ac input end of described high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
3) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance L r and capacitor C p and capacitor C r, high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than;
Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LCC resonant circuit, the capacitor C p in LCC resonant circuit and the parallel connection of primary windings of high frequency transformer;
The secondary coil of the ac input end of described high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
4) described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance L r and capacitor C r, secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer;
5) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance L r and inductance L m and capacitor C r, high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the inductance L m in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer;
6) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance L r and capacitor C p and capacitor C r, high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the capacitor C p in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Described high-power inverter is current source inverter, or is the voltage source inverter at DC terminal series diode check (non-return) valve.
Described inductance L r is independent inductance element, or the leakage inductance of described high frequency transformer; Described in another, inductance L m is independent inductance element, or the magnetizing inductance of described high frequency transformer.
The beneficial effect that the present invention has is: through one, the modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus based on high frequency technique carries out regenerative resource (wind energy, solar energy) Blast Furnace Top Gas Recovery Turbine Unit (TRT): unsteady flow, electromagnetic isolation, directly receive high voltage dc bus after boosting, electricity can be directly by DC power transmission line and the large electrical network of AC network side inverter input AC; And, in low-voltage direct side, configure the energy storage device of certain capacity to improve the adjustability of renewable energy power generation plan; Compare with traditional regenerative resource (wind energy, solar energy) generating field and transmission system thereof, the present invention adopts HVDC Transmission Technology that sent power delivery is arrived and exchanges large electrical network, and regenerative resource (wind energy, solar energy) generating field does not need: 1) duplex frequency boostering transformer; 2) power frequency inverter; 3) generating field power transmission and transforming equipment (main transformer, circuit breaker etc.).
Therefore the technology of the present invention greatly improved regenerative resource (wind energy, solar energy) generation schedule adjustability, power delivery ability, low voltage ride-through capability, increased reliability, improved the quality of power supply, saved a large amount of raw material (silicon steel sheet, copper conductor), reduced holistic cost.In the time of particularly on being applied to Oversea wind power generation project, owing to having adopted in DC/DC current transformer, high frequency transformer boosts, isolation technology, greatly reduce the volume and weight of step-up transformer, therefore can also greatly save the construction cost of the marine level platform of blower fan offshore platform (basis) and wind energy turbine set primary substation.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Fig. 2 a and Fig. 2 b are the circuit structure diagrams of " regenerative resource integrated power generation unit " in Fig. 1.
Fig. 3 a and Fig. 3 b are the electrical block diagrams of " modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus " in Fig. 2 a and Fig. 2 b.
Fig. 4 a is the circuit diagram of one of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Fig. 4 b is two the circuit diagram of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Fig. 4 c is three the circuit diagram of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Fig. 4 d is four the circuit diagram of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Fig. 4 e is five the circuit diagram of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Fig. 4 f is six the circuit diagram of " electromagnetic isolation type DC/DC current transformer " embodiment in Fig. 3 a and Fig. 3 b.
Embodiment
Below in conjunction with Figure of description, the invention will be further described, but the present invention is not limited to following examples.
As shown in Figure 1, renewable energy power generation of the present invention, power transmission and transformation and electrical network access integral system, comprise that several regenerative resource integrated power generation unit 1, at least one HVDC (High Voltage Direct Current) transmission line 2, at least one high-power inverter 3 and generating field calculate crane monitoring system 4.The output of each regenerative resource integrated power generation unit is high voltage direct current, and is all connected in parallel on same high voltage dc bus HVDC; One end of described HVDC (High Voltage Direct Current) transmission line is also connected with same high voltage dc bus HVDC, other one end of HVDC (High Voltage Direct Current) transmission line is connected to the direct-flow input end of described high-power inverter, and the ac output end of described high-power inverter is connected to and exchanges large electrical network.The function of high-power inverter is to deliver to the large electrical network of interchange after direct current is converted to alternating current, can adopt current source inverter, also can adopt the voltage source inverter at DC terminal series diode check (non-return) valve; The function of diode check (non-return) valve is when short trouble appears in DC power transmission line, to prevent from exchanging large electrical network to inject fault current to DC side.
Described generating field calculates crane monitoring system generating field and calculates the conventional supervisory control system of crane monitoring system 4(), control centre is connected with dispatching of power netwoks, the state of each equipment in Real-Time Monitoring generating field, accept dispatching of power netwoks control centre dispatching command, to described regenerative resource integrated power generation unit, issue generating set point.The electricity that described regenerative resource integrated power generation unit sends is transported to and exchanges large electrical network with high-power inverter through described HVDC (High Voltage Direct Current) transmission line.
Fig. 2 a and Fig. 2 b are the circuit structure diagrams of the regenerative resource integrated power generation unit in Fig. 1, and this regenerative resource integrated power generation unit comprises: one or more renewable energy power generation devices, a modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, an energy storage device and a cell controller.The output of renewable energy power generation device is connected on low-voltage direct bus LVDC; Energy storage device output is also connected on same low-voltage direct bus LVDC; It is upper that the low-pressure side of modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus is also connected to same low-voltage direct bus LVDC, and the high-pressure side of modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus is connected on the high voltage bus HVDC of generating field.
Described renewable energy power generation device is the combination of a kind of in following form or at least two kinds:
1) described renewable energy power generation device is one or more photovoltaic battery arrays (Fig. 2 b);
2) described renewable energy power generation device be one or more with the three-phase based on IGBT module or heterogeneous PWM initiatively the asynchronous wind driven generators of rectification circuit (Fig. 2 a):
3) described renewable energy power generation device is one or more permanent magnet direct-drive wind-force generating machines with rectification circuit;
4) described renewable energy power generation device is one or more synchro wind generators with rectification circuit.
The rectification circuit of described permanent magnet direct-drive wind-force generating machine can be conventional diode rectifier circuit; Also can be that conventional diode rectifier circuit adds Boost circuit; Also can be that conventional diode rectifier circuit adds pfc circuit; Also can be three-phase or the heterogeneous PWM active rectification circuit (be above conventional rectification circuit, do not describe in detail) based on IGBT module.
The rectification circuit of described synchro wind generator can be conventional diode rectifier circuit; Also can be that conventional diode rectifier circuit adds Boost circuit; Also can be that conventional diode rectifier circuit adds pfc circuit; Also can be three-phase or the heterogeneous PWM active rectification circuit (be above conventional rectification circuit, do not describe in detail) based on IGBT module.
The output of described photovoltaic battery array is all received on low-voltage direct bus LVDC.The ac input end of the rectification circuit that the ac output end of asynchronous wind driven generator (or permanent magnet direct-drive wind-force generating machine, or synchro wind generator) is corresponding with it connects, rectification circuit DC output end be connected on low-voltage direct bus LVDC.
Described energy storage device in Fig. 2 a and Fig. 2 b, comprises two-way DC/DC current transformer (outsourcing acquisition), a super capacitor system (outsourcing acquisition) of a non-electromagnetic isolation type; Or described energy storage device comprises two-way DC/DC current transformer, a battery system (outsourcing acquisition) of a non-electromagnetic isolation type.One end of the two-way DC/DC current transformer of non-electromagnetic isolation type is connected with low-voltage direct bus LVDC, and the other end is connected with battery system or super capacitor system.
The two-way DC/DC current transformer of above-mentioned non-electromagnetic isolation type, comprises a reactor L, capacitor C, two IGBT or MOSFET module T1, T2; Two diode D1, D2 form.Wherein IGBT or MOSFET module T1, diode D2, reactor L, capacitor C form a typical BUCK circuit, during work, by low-voltage direct bus LVDC, to battery system (or super capacitor system), are charged; IGBT or MOSFET module T2, diode D1, reactor L, capacitor C form a typical BOOST circuit, and battery system during work (or super capacitor system) discharges to low-voltage direct bus LVDC.
Described cell controller in Fig. 2 a and Fig. 2 b (buyable acquisition), comprises a microprocessor unit and a connected signal acquisition circuit, a communication module.Signal acquisition circuit is connected with described renewable energy power generation device, modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device, gathers the analog-and digital-variable in regenerative resource integrated power generation unit; Communication module calculates crane monitoring system with generating field and is connected, and is responsible for calculating with generating field the function of crane monitoring system communication; The generating set point that the signal that microprocessor unit obtains based on sampling, generating field calculating crane monitoring system issue is carried out after computing, and output control signal is controlled modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device.The maximal power tracing of photovoltaic power generation apparatus (MPPT) function also realizes in this controller.
As shown in Figure 3 a and Figure 3 b shows, described modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus is comprised of a plurality of identical electromagnetic isolation type DC/DC current transformers, major function is that low dc voltage is raised to High Level DC Voltage, and high pressure and low-voltage direct-current system are carried out to electromagnetic isolation.After the input parallel connection of all electromagnetic isolation type DC/DC current transformers, receive the low-voltage direct bus LVDC in regenerative resource integrated power generation unit; The output of all electromagnetic isolation type DC/DC current transformers has following two kinds of structures: above (Fig. 3 a) 1) after all electromagnetic isolation type DC/DC current transformer series connection, to receive high voltage dc bus HVDC; 2) after the output parallel connection of all electromagnetic isolation type DC/DC current transformers, receive high voltage dc bus HVDC upper (Fig. 3 b).
Described electromagnetic isolation type DC/DC current transformer has execution mode in following 6:
Embodiment mono-: as shown in Fig. 4 a, described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides rectification circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance L r and capacitor C r, secondary coil more than.Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit can be a capacitor, can be also a LC filter circuit.Described inductance L r can make independent inductance element, can be also the leakage inductance of described high frequency transformer; The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit.The secondary coil of the input of high-pressure side rectification circuit (exchanging end) high frequency transformer corresponding thereto connects.After output (DC terminal) cascade of a plurality of high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Embodiment bis-: as shown in Figure 4 b, described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance L r and inductance L m and capacitor C r, high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than.Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit can be a capacitor, can be also a LC filter circuit.Described inductance L r can be independent inductance element, can be also the leakage inductance of described high frequency transformer, and the inductance L m described in another can be independent inductance element, can be also the magnetizing inductance of described high frequency transformer.The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the inductance L m in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer.The secondary coil of the input of high-pressure side rectification circuit (exchange end) high frequency transformer corresponding thereto connects, after output (DC terminal) cascade of a plurality of high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Embodiment tri-: as shown in Fig. 4 c, described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance L r and capacitor C p and capacitor C r, high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than.Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit can be a capacitor, can be also a LC filter circuit.Described inductance L r can be independent inductance element, can be also the leakage inductance of described high frequency transformer.The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LCC resonant circuit, the capacitor C p in LCC resonant circuit and the parallel connection of primary windings of high frequency transformer.The secondary coil of the input of high-pressure side rectification circuit (exchange end) high frequency transformer corresponding thereto connects, after output (DC terminal) cascade of a plurality of high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Embodiment tetra-: as shown in Fig. 4 d, described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance L r and capacitor C r, secondary coil more than.Described inductance L r can be independent inductance element, can be also the leakage inductance of described high frequency transformer.The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit.The secondary coil of the input of high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects.After output (DC terminal) cascade of a plurality of high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Embodiment five: as shown in Fig. 4 e, described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance L r and inductance L m and capacitor C r, high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than.The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the inductance L m in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer.Described inductance L r can be independent inductance element, can be also the leakage inductance of described high frequency transformer, and the inductance L m described in another can be independent inductance element, can be also the magnetizing inductance of described high frequency transformer.The secondary coil of the input of high-pressure side voltage doubling rectifing circuit (exchanging end) high frequency transformer corresponding thereto connects.After output (DC terminal) cascade of a plurality of high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Embodiment six: as shown in Fig. 4 f, described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance L r and capacitor C p and capacitor C r, high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than.Described inductance L r can be independent inductance element, can be also the leakage inductance of described high frequency transformer.The DC terminal of low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus LVDC as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance L r and capacitor C r series connection in LLC resonant circuit, the capacitor C p in LLC resonant circuit and the parallel connection of primary windings of high frequency transformer.The secondary coil of the input of high-pressure side voltage doubling rectifing circuit (exchanging end) high frequency transformer corresponding thereto connects.After output (DC terminal) cascade of a plurality of high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer.
Electronic component and the equal buyables of electronic equipment all in the present invention obtain.
Claims (10)
1. renewable energy power generation, power transmission and transformation and electrical network access integral system, comprise that several regenerative resource integrated power generation unit (1), at least one HVDC (High Voltage Direct Current) transmission line (2), at least one high-power inverter (3) and generating field calculate crane monitoring system (4); It is characterized in that: described in each, the output of regenerative resource integrated power generation unit (1) is connected on high voltage dc bus (HVDC), one end of HVDC (High Voltage Direct Current) transmission line (2) is also connected on high voltage dc bus (HVDC), the other end of HVDC (High Voltage Direct Current) transmission line (2) is connected to the direct-flow input end of high-power inverter (3), and the ac output end of high-power inverter (3) is connected to and exchanges large electrical network; Generating field calculates the dispatching command that crane monitoring system (4) and dispatching of power netwoks control centre (5) are connected and accept dispatching of power netwoks control centre, and generating field calculating crane monitoring system (4) is also connected with regenerative resource integrated power generation unit (1) and issues generating set point to regenerative resource integrated power generation unit (1).
2. according to the renewable energy power generation described in claim 1, power transmission and transformation and electrical network access integral system, it is characterized in that: described regenerative resource integrated power generation unit comprises a renewable energy power generation device, a modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, an energy storage device and a cell controller; The output of renewable energy power generation device is connected on low-voltage direct bus (LVDC), energy storage device output is also connected on same low-voltage direct bus (LVDC), the low-pressure side of modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus is also connected on same low-voltage direct bus (LVDC), high-pressure side is connected on the high voltage dc bus (HVDC) of generating field, and cell controller is connected with renewable energy power generation device, modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device.
3. according to the renewable energy power generation described in claim 2, power transmission and transformation and electrical network access integral system, it is characterized in that: described renewable energy power generation device at least one photovoltaic battery array, at least one asynchronous wind driven generator with the three-phase based on IGBT module or heterogeneous active PWM rectification circuit, at least one permanent magnet direct-drive wind-force generating machine with rectification circuit, at least one is with at least one in the synchro wind generator of rectification circuit;
The output of photovoltaic battery array is all received on low-voltage direct bus (LVDC);
The ac input end of the three-phase that the ac output end of asynchronous wind driven generator is corresponding with asynchronous wind driven generator or heterogeneous active PWM rectification circuit connects, and the DC output end of three-phase or heterogeneous active PWM rectification circuit is connected on low-voltage direct bus (LVDC);
The ac input end of the rectification circuit that the ac input end of permanent magnet direct-drive wind-force generating machine is corresponding with permanent magnet direct-drive wind-force generating machine connects, and the DC output end of this rectification circuit is connected on low-voltage direct bus (LVDC);
The ac input end of the rectification circuit that the ac output end of synchro wind generator is corresponding with synchro wind generator connects, and the DC output end of this rectification circuit is connected on low-voltage direct bus (LVDC);
One of the rectification circuit of described permanent magnet direct-drive wind-force generating machine or the rectification circuit of synchro wind generator are following form:
1) described rectification circuit is diode rectifier circuit;
2) described rectification circuit is that diode rectifier circuit adds Boost circuit;
3) described rectification circuit is that diode rectifier circuit adds pfc circuit;
4) described rectification circuit is three-phase or the heterogeneous active PWM rectification circuit based on IGBT module.
4. renewable energy power generation according to claim 3, power transmission and transformation and electrical network access integral system, is characterized in that: described cell controller comprises microprocessor unit and connected signal acquisition circuit, communication module; Signal acquisition circuit is connected to gather analog-and digital-variable with described renewable energy power generation device, modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus, energy storage device, and communication module calculates crane monitoring system with described generating field and is connected.
5. renewable energy power generation according to claim 4, power transmission and transformation and electrical network access integral system, it is characterized in that: described energy storage device comprises two-way DC/DC current transformer and a super capacitor system of a non-electromagnetic isolation type, or the two-way DC/DC current transformer of a non-electromagnetic isolation type and a battery system; One end of the two-way DC/DC current transformer of non-electromagnetic isolation type is connected with low-voltage direct bus (LVDC), and the other end is connected with battery system or super capacitor system.
6. renewable energy power generation according to claim 5, power transmission and transformation and electrical network access integral system, is characterized in that: the two-way DC/DC current transformer of described non-electromagnetic isolation type comprises a reactor (L), a capacitor (C), two IGBT or MOSFET module (T1, T2), two diodes (D1, D2); Wherein,
IGBT or MOSFET module (T1), diode (D2), reactor (L), capacitor (C) form a BUCK circuit;
IGBT or MOSFET module (T2), diode (D1), reactor (L), capacitor (C) form a BOOST circuit.
7. according to the renewable energy power generation described in claim 2-6 any one, power transmission and transformation and electrical network access integral system, it is characterized in that: described modular high-power electromagnetic isolation type DC/DC unsteady flow increasing apparatus comprises a plurality of identical electromagnetic isolation type DC/DC current transformers, the low-voltage direct bus (LVDC) of receiving after the input parallel connection of all electromagnetic isolation type DC/DC current transformers in regenerative resource integrated power generation unit is upper, after the output series connection of all electromagnetic isolation type DC/DC current transformers or parallel connection, receives on high voltage dc bus (HVDC).
8. renewable energy power generation according to claim 7, power transmission and transformation and electrical network access integral system, it is characterized in that: one of the structure of described electromagnetic isolation type DC/DC current transformer is following form:
1) described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides rectification circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance (Lr) and electric capacity (Cr), secondary coil more than;
Described high-pressure side rectification circuit consists of the output filter circuit of a diode full bridge rectifier and diode full bridge rectifier DC side, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit;
The secondary coil of the ac input end of each high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
2) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance (Lr) and inductance (Lm) and electric capacity (Cr), high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than;
Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance (Lr) and electric capacity (Cr) series connection in LLC resonant circuit, the parallel connection of primary windings of the inductance in LLC resonant circuit (Lm) and high frequency transformer;
The secondary coil of the ac input end of described high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
3) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance (Lr) and electric capacity (Cp) and electric capacity (Cr), high frequency transformer and a plurality of high-pressure sides rectification circuit of secondary coil more than;
Described high-pressure side rectification circuit consists of a diode full bridge rectifier and DC side output filter circuit thereof, and this output filter circuit is a capacitor or a LC filter circuit;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance (Lr) and electric capacity (Cr) series connection in LCC resonant circuit, the parallel connection of primary windings of the electric capacity in LCC resonant circuit (Cp) and high frequency transformer;
The secondary coil of the ac input end of described high-pressure side rectification circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides rectification circuit as the output of described electromagnetic isolation type DC/DC current transformer;
4) described electromagnetic isolation type DC/DC current transformer comprises high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LC series resonant circuit being comprised of inductance (Lr) and electric capacity (Cr), secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) above as the input of described electromagnetic isolation type DC/DC current transformer, and the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer with after the series connection of LC series resonant circuit;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer;
5) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LLC resonant circuit being comprised of inductance (Lr) and inductance (Lm) and electric capacity (Cr), high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance (Lr) and electric capacity (Cr) series connection in LLC resonant circuit, the parallel connection of primary windings of the inductance in LLC resonant circuit (Lm) and high frequency transformer;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer;
6) described electromagnetic isolation type DC/DC current transformer comprises a low-pressure side full-bridge inverter consisting of IGBT or MOSFET and DC capacitor thereof, LCC resonant circuit being comprised of inductance (Lr) and electric capacity (Cp) and electric capacity (Cr), high frequency transformer and a plurality of high-pressure sides voltage doubling rectifing circuit of secondary coil more than;
The DC terminal of described low-pressure side full-bridge inverter is connected in parallel on low-voltage direct bus (LVDC) as the input of described electromagnetic isolation type DC/DC current transformer, the interchange end of low-pressure side full-bridge inverter is connected with the primary coil of high frequency transformer afterwards with inductance (Lr) and electric capacity (Cr) series connection in LLC resonant circuit, the parallel connection of primary windings of the electric capacity in LLC resonant circuit (Cp) and high frequency transformer;
The secondary coil of the input of described high-pressure side voltage doubling rectifing circuit high frequency transformer corresponding thereto connects, after the DC output end cascade of all high-pressure sides voltage doubling rectifing circuit as the output of described electromagnetic isolation type DC/DC current transformer.
9. renewable energy power generation according to claim 8, power transmission and transformation and electrical network access integral system, is characterized in that: described high-power inverter is current source inverter, or be the voltage source inverter at DC terminal series diode check (non-return) valve.
10. renewable energy power generation according to claim 9, power transmission and transformation and electrical network access integral system, is characterized in that: described inductance (Lr) is independent inductance element, or the leakage inductance of described high frequency transformer; Inductance described in another (Lm) is independent inductance element, or the magnetizing inductance of described high frequency transformer.
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| CN108832890A (en) * | 2018-07-30 | 2018-11-16 | 浙江人和光伏科技有限公司 | A kind of photovoltaic component terminal box rapidly switched off |
| CN108832890B (en) * | 2018-07-30 | 2024-04-26 | 浙江人和光伏科技有限公司 | Photovoltaic module junction box capable of being rapidly turned off |
| CN109490004A (en) * | 2018-12-29 | 2019-03-19 | 珠海九源电力电子科技有限公司 | A kind of symmetrical expression electromagnetic drive experimental system and control method |
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| CN113258801A (en) * | 2020-02-12 | 2021-08-13 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
| CN113258801B (en) * | 2020-02-12 | 2022-11-29 | 新疆金风科技股份有限公司 | Direct current gets electric installation, system and wind generating set's start control system |
| CN112531779A (en) * | 2020-12-07 | 2021-03-19 | 国网新疆电力有限公司昌吉供电公司 | Multi-area power grid connection method |
| CN112531779B (en) * | 2020-12-07 | 2024-01-23 | 国网新疆电力有限公司昌吉供电公司 | Multi-region power grid wiring method |
| TWI800119B (en) * | 2021-11-25 | 2023-04-21 | 應能科技股份有限公司 | solar energy conversion system |
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