CN103812101A - Multi-voltage level direct current power grid system with DC/DC converter - Google Patents
Multi-voltage level direct current power grid system with DC/DC converter Download PDFInfo
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Abstract
The invention discloses a multi-voltage level direct current power grid system with a DC/DC converter. The multi-voltage level direct current power grid system comprises a new energy power generation base, an alternating current power grid, a DC/DC converter and a converter station; the new energy power generation base is directly connected with direct current buses, different direct current buses are connected through the DC/DC converter, and the alternating current power grid is connected with the direct current buses through the converter station. The multi-voltage level direct current power grid system with the DC/DC converter can not only realize the smooth and reliable connection of the large-scale new energy power but also has features of agile control measure and various running modes, and the multi-voltage level direct current power grid system is capable of realizing the interconnection and complementation between alternating and direct current power grids in wide range, is capable of realizing the power regulation and complementation in wide range, and is capable of greatly improving the running stability of the prior electric system without increasing the short-circuit current of the alternating current system.
Description
Technical field
The invention belongs to generation of electricity by new energy technical field, be specifically related to a kind of multi-voltage grade direct current network system with DC/DC converter.
Background technology
Along with the develop rapidly of global economy, the consumption of the energy is day by day huge, the problems such as thing followed energy scarcity, environmental pollution, climatic deterioration are increasingly sharpened, and countries in the world have realized that the utilization and exploitation of the energy must be from traditional energy to regenerative resource transition.Expected for the end of the year 2013, Wind Power In China total installation of generating capacity will reach 7,500 ten thousand kilowatts, become the first in the world wind-powered electricity generation big country.Solar energy total installation of generating capacity also will reach 1,000 ten thousand kilowatts simultaneously, but be limited to the also ability of dissolving of net mode, partial electric grid framework and existing electric power system, most of regenerative resource is underutilized, and even occurs the phenomenons such as " abandoning wind ", " abandoning light "; The generation of electricity by new energy such as wind energy, solar energy has the feature such as intermittence, stochastic volatility on the other hand, along with various new forms of energy access electrical network on a large scale, traditional electric network composition, electrical circuitry equipment and management and running technology etc., day by day seeming unable to do what one wishes aspect the extensive new forms of energy of receiving, must adopt novel power grid structure, new equipment and new technology to meet the profound change of future source of energy general layout for this reason.
There is not the stable problems such as the intrinsic voltage of ac transmission, merit angle and frequency due to VSC multi-terminal HVDC transmission, fed distance and transmission power are not subject to the restriction of electric power system synchronous operation stability yet, and have the ability of active power and reactive power independent regulation, so such DC transmission system can cushion the fluctuation access of extensive new forms of energy.Therefore, relevant scholar has carried out the correlation theory research for the multi-terminal HVDC transmission of extensive new-energy grid-connected in succession both at home and abroad, and has formed correlative study achievement.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of multi-voltage grade direct current network system with DC/DC converter, it not only can solve the smooth and reliable access problem of extensive new forms of energy electric power, and possess that control device is flexible, the feature such as operational mode is abundant, in the situation that not increasing exchanges system short-circuit electric current, can realize the interconnected and complementary of the interior AC and DC electrical network of wide area, can realize the adjusting of wide area power and help mutually, can greatly promote existing power system operation stability.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of multi-voltage grade direct current network system with DC/DC converter, described system comprises generation of electricity by new energy base, AC network, DC/DC converter and current conversion station; Described generation of electricity by new energy base directly connects DC bus, between different DC buss, connects by DC/DC converter, and described AC network connects DC bus by current conversion station.
Described generation of electricity by new energy base comprises offshore novel energy generating base, coastal generation of electricity by new energy base and land generation of electricity by new energy base.
Described current conversion station comprises VSC type current conversion station and LCC type current conversion station, and described AC network comprises synchronous AC electrical network and Asynchronous Communication electrical network, and described VSC type current conversion station and LCC type current conversion station directly access synchronous AC electrical network or Asynchronous Communication electrical network.
Direct current network is accessed with the mode that land generation of electricity by new energy base three is all directly connected DC bus in described offshore novel energy generating base, coastal generation of electricity by new energy base, or by DC/DC converter access direct current network.
Described DC/DC converter comprises a DC/DC converter, the 2nd DC/DC converter, the 3rd DC/DC converter, the 4th DC/DC converter and the 5th DC/DC converter; Described DC bus comprises the first DC bus, the second DC bus, the 3rd DC bus, the 4th DC bus, the 5th DC bus, the 6th DC bus, the 7th DC bus, the 8th DC bus and the 9th DC bus.
The electric pressure of described the first DC bus is identical with the electric pressure of the 7th, eight, nine DC buss, described the 6th DC bus-bar voltage grade is higher than the first DC bus-bar voltage grade, the first DC bus-bar voltage grade higher than second and the 3rd DC bus-bar voltage grade, second and the 3rd DC bus-bar voltage grade higher than the 4th and the 5th DC bus-bar voltage grade.
Described land generation of electricity by new energy base directly connects the first DC bus, coastal generation of electricity by new energy base directly connects the second DC bus, described the 8th DC bus directly connects the first DC bus, and connect the second DC bus by the 3rd DC/DC converter, the second DC bus is connected the 4th DC bus with the 2nd DC/DC converter, described the 9th DC bus connects the 3rd DC bus by the 3rd DC/DC converter, and the 3rd DC bus connects the 5th DC bus by the 2nd DC/DC converter; Described the 9th DC bus connects the 6th DC bus by the 4th DC/DC converter, and the 6th DC bus connects synchronous AC electrical network or Asynchronous Communication electrical network by LCC type current conversion station; Described the 7th DC bus connects the 8th DC bus by the 5th DC/DC converter, and described the 7th DC bus directly connects the 9th DC bus, and described the 7th DC bus connects synchronous AC electrical network and Asynchronous Communication electrical network by VSC type current conversion station; Described offshore novel energy generating base directly connects the 5th DC bus, or connects the first DC bus by a DC/DC converter.
A described DC/DC converter is single bipolarity conversion DC/DC converter, the 2nd DC/DC converter is direct current transformer station, described the 3rd DC/DC converter is high-gain DC/DC converter, described the 4th DC/DC converter is the polarity of voltage DC/DC converter that can reverse, and described the 5th DC/DC converter is low gain DC/DC converter.
Compared with prior art, beneficial effect of the present invention is:
1, the extensive new forms of energy of can farthest developing, transmit and dissolve, solving inland and nearly off-lying sea new forms of energy electric power collects and sends problem outside, for close friend's access in extensive new forms of energy base provides technical support, alleviate global energy in short supply and improve the problems such as environmental pollution.
2, in the direct current network system proposing, comprise multiple high power D C/DC converter, solve VSC direct current network interconnected of different electric pressures, bipolarity and unipolar direct current network interconnected, direct current network and existing AC network interconnected, and the system problem such as interconnected between VSC type direct current network and traditional LCC type DC transmission system, promote reliability service interval and the stability of existing electric power system.
3, can to realize multiple spot interconnected with existing AC network, traditional LCC DC transmission system, power stream can be controlled flexibly, can realize the buffering to fluctuation injecting power simultaneously, promote the operational flexibility of the type direct current network, strengthen the reliability of new forms of energy accesses, reduce the demand for control of large capacity generation of electricity by new energy unit to ac high voltage, low-voltage and no-voltage crossing technology, effectively reduced the control technology threshold of large capacity generation of electricity by new energy unit.
Accompanying drawing explanation
Fig. 1 is the multi-voltage grade direct current network system configuration schematic diagram with DC/DC converter;
Fig. 2 is the multi-voltage grade direct current network system configuration schematic diagram with DC/DC converter in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention is based on existing voltage source commutation (Voltage Source Converter, VSC) HVDC Transmission Technology, electrical network commutation (Line Commutated Converter, LCC) HVDC Transmission Technology and high power D C/DC converter technology have proposed a kind of direct current network system that is applicable to the multi-voltage grade reliable grid-connected containing extensive new forms of energy.This direct current network has DC power flow, and controlled, fault can be isolated fast flexibly, network restructural and power fluctuation be to features such as systematic influence can suppress; can realize the direct current network based on voltage source commutation, bipolarity and unipolar direct current network, direct current network and the AC network of different electric pressures; and interconnected between VSC direct current network and traditional LCC DC transmission system, be a kind of important technical that solves the problems such as collecting on a large scale, transmit and dissolve of land in wide area and offshore novel energy.
As Fig. 1, the invention provides a kind of multi-voltage grade direct current network system with DC/DC converter, described system comprises generation of electricity by new energy base, AC network, DC/DC converter and current conversion station; Described generation of electricity by new energy base directly connects DC bus, between different DC buss, connects by DC/DC converter, and described AC network connects DC bus by current conversion station.
Described generation of electricity by new energy base comprises offshore novel energy generating base, coastal generation of electricity by new energy base and land generation of electricity by new energy base.
Described current conversion station comprises VSC type current conversion station and LCC type current conversion station, and described AC network comprises synchronous AC electrical network and Asynchronous Communication electrical network, and described VSC type current conversion station and LCC type current conversion station directly access synchronous AC electrical network or Asynchronous Communication electrical network.
Direct current network is accessed with the mode that land generation of electricity by new energy base three is all directly connected DC bus in described offshore novel energy generating base, coastal generation of electricity by new energy base, or by DC/DC converter access direct current network.
Described DC/DC converter comprises a DC/DC converter, the 2nd DC/DC converter, the 3rd DC/DC converter, the 4th DC/DC converter and the 5th DC/DC converter; In described direct current network system, can comprise multiple or a kind of contact potential series, in Fig. 11,2,3,4,5,6,7,8,9 represents respectively a kind of DC bus of direct voltage sequence, and DC bus comprises the first DC bus, the second DC bus, the 3rd DC bus, the 4th DC bus, the 5th DC bus, the 6th DC bus, the 7th DC bus, the 8th DC bus and the 9th DC bus.
The electric pressure of described the first DC bus is identical with the electric pressure of the 7th, eight, nine DC buss, described the 6th DC bus-bar voltage grade is higher than the first DC bus-bar voltage grade, the first DC bus-bar voltage grade higher than second and the 3rd DC bus-bar voltage grade, second and the 3rd DC bus-bar voltage grade higher than the 4th and the 5th DC bus-bar voltage grade.
Described land generation of electricity by new energy base directly connects the first DC bus, coastal generation of electricity by new energy base directly connects the second DC bus, described the 8th DC bus directly connects the first DC bus, and connect the second DC bus by the 3rd DC/DC converter, the second DC bus is connected the 4th DC bus with the 2nd DC/DC converter, described the 9th DC bus connects the 3rd DC bus by the 3rd DC/DC converter, and the 3rd DC bus connects the 5th DC bus by the 2nd DC/DC converter; Described the 9th DC bus connects the 6th DC bus by the 4th DC/DC converter, and the 6th DC bus connects synchronous AC electrical network or Asynchronous Communication electrical network by LCC type current conversion station; Described the 7th DC bus connects the 8th DC bus by the 5th DC/DC converter, and described the 7th DC bus directly connects the 9th DC bus, and described the 7th DC bus connects synchronous AC electrical network and Asynchronous Communication electrical network by VSC type current conversion station; Described offshore novel energy generating base directly connects the 5th DC bus, or connects the first DC bus by a DC/DC converter.
The one DC/DC converter major function comprises: 1) mate single bipolarity direct current transportation mode; 2) asymmetric operation or the monopolar operation of cooperation bipolar DC system; 3) two-way flow of power; 4) isolation of fault.The main control strategies of this quasi-converter comprises: 1) constant DC voltage control; 2) determine active power control; 3) determine Current Control; The one DC/DC converter is single bipolarity conversion DC/DC converter;
The 2nd DC/DC converter major function comprises: 1) the multiport direct current in polymorphic type generation of electricity by new energy base collects; 2) interconnected between different voltage levels direct current transmission systems; 3) to and fro flow of power; 4) Fault Isolation; 5) power reallocation.The main control strategies of this quasi-converter comprises: 1) constant DC voltage control; 2) determine active power control; 3) determine Current Control; The 2nd DC/DC converter is direct current transformer station;
The 3rd DC/DC converter major function comprises: 1) interconnected between different voltage levels direct current transmission systems; 2) to and fro flow of power; 3) Fault Isolation.The main control strategies of this quasi-converter comprises: 1) constant DC voltage control; 2) determine active power control; 3) determine Current Control; The 3rd DC/DC converter is high-gain DC/DC converter;
The 4th DC/DC converter major function comprises: 1) interconnected between VSC direct current network and LCC DC transmission system; 2) LCC side polarity of voltage reversion; 3) to and fro flow of power; 4) Fault Isolation.The main control strategies of this quasi-converter comprises: 1) constant DC voltage control; 2) determine active power control; 3) determine Current Control; The 4th DC/DC converter is the polarity of voltage DC/DC converter that can reverse;
The electric pressure of the DC bus 7,8,9 that the 5th DC/DC converter connects is identical, and major function comprises: the 1) adjusting of power and reallocation; 2) to and fro flow of power; 3) Fault Isolation.The main control strategies of this quasi-converter comprises: 1) constant DC voltage control; 2) determine active power control; 3) determine Current Control; The 5th DC/DC converter is low gain DC/DC converter.
Multi-voltage grade direct current network system with DC/DC converter provided by the invention, can realize slitless connection and Fault Isolation between dissimilar and different electric pressure electrical networks or electrical power trans mission/distribution system; The height that can realize extensive new forms of energy base, inland and marine electric power is integrated, it not only can solve the smooth and reliable access problem of extensive new forms of energy electric power, and possess that control device is flexible, the feature such as operational mode is abundant, in the situation that not increasing exchanges system short-circuit electric current, can realize the interconnected and complementary of the interior AC and DC electrical network of wide area, can realize the adjusting of wide area power and help mutually, can greatly promote existing power system operation stability.
Direct current network system can integrated extensive new forms of energy electric power, and interconnected with conventional AC electrical network multiple spot, has also realized and LCC HVDC (High Voltage Direct Current) transmission system slitless connection, can effectively solve China's new forms of energy electric power transfer and the problem of dissolving.
Embodiment
Multi-voltage grade direct current network system configuration with DC/DC converter in embodiment is illustrated as shown in Figure 2.In figure, mainly comprise multi-voltage grade direct current network, AC network, LCC DC power transmission system polymorphic type land, the marine and coastal generation of electricity by new energy base etc. on a large scale that unifies.In figure, the DC bus-bar voltage grade of the dissimilar offshore novel energy generating base port of export is ± 100kV/ ± 150kV, land generation of electricity by new energy base port of export direct current transmission net DC bus-bar voltage grade ± 320kV.Wherein: the offshore novel energy generating base 1 that adopts bipolar direct current transmission, 2 are directly connected with marine direct current transmission net by the DC hub5 of direct current transformer station, and voltage is increased to the transmission voltage grade ± 320kV of direct current transmission net, adopt the offshore novel energy generating base of one pole direct current transportation first through single bipolarity conversion DC/DC converter DC/DC7,8 convert after, then be connected with marine direct current transmission net by the DC hub6 of direct current transformer station; Marine direct current transmission net is again by high-gain DC/DC converter DC/DC2, and 3 are connected with land direct current transportation net, and voltage are increased to the electric pressure ± 600kV of direct current transportation net; For land direct current transportation net, can on overhead wire, install low gain DC/DC converter DC/DC1, for regulating power or reallocation trend; Direct current transportation net can pass through land VSC1, and 2 are connected to AC network, also can pass through land VSC3, and 4 are connected to land generation of electricity by new energy base, also can be connected with land LCC DC transmission system through the polarity of voltage DC/DC converter DC/DC4 that can reverse.By this multi-voltage grade direct current network system with DC/DC converter that adopts the present invention to propose, can realize extensive land and access, VSC direct current network and the existing AC system in offshore novel energy generating base, the interconnected and Fault Isolation of LCC DC transmission system, and can farthest reduce fluctuating power and inject impact on AC system and the impact of serial-parallel power grid, realize to greatest extent dissolving of new forms of energy simultaneously.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. the multi-voltage grade direct current network system with DC/DC converter, is characterized in that: described system comprises generation of electricity by new energy base, AC network, DC/DC converter and current conversion station; Described generation of electricity by new energy base directly connects DC bus, between different DC buss, connects by DC/DC converter, and described AC network connects DC bus by current conversion station.
2. the multi-voltage grade direct current network system with DC/DC converter according to claim 1, is characterized in that: described generation of electricity by new energy base comprises offshore novel energy generating base, coastal generation of electricity by new energy base and land generation of electricity by new energy base.
3. the multi-voltage grade direct current network system with DC/DC converter according to claim 1, it is characterized in that: described current conversion station comprises VSC type current conversion station and LCC type current conversion station, described AC network comprises synchronous AC electrical network and Asynchronous Communication electrical network, and described VSC type current conversion station and LCC type current conversion station directly access synchronous AC electrical network or Asynchronous Communication electrical network.
4. the multi-voltage grade direct current network system with DC/DC converter according to claim 2, it is characterized in that: direct current network is accessed with the mode that land generation of electricity by new energy base three is all directly connected DC bus in described offshore novel energy generating base, coastal generation of electricity by new energy base, or by DC/DC converter access direct current network.
5. the multi-voltage grade direct current network system with DC/DC converter according to claim 4, is characterized in that: described DC/DC converter comprises a DC/DC converter, the 2nd DC/DC converter, the 3rd DC/DC converter, the 4th DC/DC converter and the 5th DC/DC converter; Described DC bus comprises the first DC bus, the second DC bus, the 3rd DC bus, the 4th DC bus, the 5th DC bus, the 6th DC bus, the 7th DC bus, the 8th DC bus and the 9th DC bus.
6. the multi-voltage grade direct current network system with DC/DC converter according to claim 5, it is characterized in that: the electric pressure of described the first DC bus is identical with the electric pressure of the 7th, eight, nine DC buss, described the 6th DC bus-bar voltage grade is higher than the first DC bus-bar voltage grade, the first DC bus-bar voltage grade higher than second and the 3rd DC bus-bar voltage grade, second and the 3rd DC bus-bar voltage grade higher than the 4th and the 5th DC bus-bar voltage grade.
7. the multi-voltage grade direct current network system with DC/DC converter according to claim 6, it is characterized in that: described land generation of electricity by new energy base directly connects the first DC bus, coastal generation of electricity by new energy base directly connects the second DC bus, described the 8th DC bus directly connects the first DC bus, and connect the second DC bus by the 3rd DC/DC converter, the second DC bus is connected the 4th DC bus with the 2nd DC/DC converter, described the 9th DC bus connects the 3rd DC bus by the 3rd DC/DC converter, the 3rd DC bus connects the 5th DC bus by the 2nd DC/DC converter, described the 9th DC bus connects the 6th DC bus by the 4th DC/DC converter, and the 6th DC bus connects synchronous AC electrical network or Asynchronous Communication electrical network by LCC type current conversion station, described the 7th DC bus connects the 8th DC bus by the 5th DC/DC converter, and described the 7th DC bus directly connects the 9th DC bus, and described the 7th DC bus connects synchronous AC electrical network and Asynchronous Communication electrical network by VSC type current conversion station, described offshore novel energy generating base directly connects the 5th DC bus, or connects the first DC bus by a DC/DC converter.
8. according to the multi-voltage grade direct current network system with DC/DC converter described in claim 5 or 7, it is characterized in that: a described DC/DC converter is single bipolarity conversion DC/DC converter, the 2nd DC/DC converter is direct current transformer station, described the 3rd DC/DC converter is high-gain DC/DC converter, described the 4th DC/DC converter is the polarity of voltage DC/DC converter that can reverse, and described the 5th DC/DC converter is low gain DC/DC converter.
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