CN111756045A - Three-in-one power electronic compensation transformer substation - Google Patents
Three-in-one power electronic compensation transformer substation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a three-in-one power electronic compensation transformer substation, which is connected in series in a power supply line and comprises: the system comprises a voltage compensation module, an electric energy quality compensation module, an energy storage power supply module, a power electronic compensation transformer substation energy management module, a sensing detection module and a common direct current bus. The three-in-one power electronic compensation substation integrates and configures three key devices for power grid regulation and performs unified energy management, the regulation of day and night peak-valley loads is realized by using an energy storage technology, the energy stored in the electricity utilization valley period can be used as an energy source to be supplied to a voltage compensation system and an electric energy quality compensation system, and the problem of compensation failure caused by extra circuit current increase of power taking unit from the power grid in the peak period is effectively avoided. The invention is distributed and arranged at the place where the voltage drops in the long-distance transmission line, can effectively improve the electric energy transmission quality of the whole line and realize the comprehensive regulation of the power grid.
Description
Technical Field
The invention belongs to a power supply or distribution circuit device or system, and particularly relates to a three-in-one power electronic compensation transformer substation of an alternating current transmission line or an alternating current distribution network.
Background
In the construction process of the smart power grid, the power transmission and transformation technology is a key technology, can provide necessary guarantee for the safe and stable operation of the smart power grid, can effectively improve the operation efficiency of the smart power grid, and increases social benefits. The problems that power grid companies face all over the world are that power grid construction in load-dispersed areas is poor in economic benefit and low in input-output ratio, and how to provide suitable power supply services for population in the load-dispersed areas in an economic mode becomes a global hot topic. The problem that the power supply voltage at the tail end of a line is low and the power quality is unqualified easily occurs due to the large power supply radius, along with the continuous increase of user load, the continuous increase of single-point large load and the fluctuation of the wave crest and the wave trough of a day and night power grid, the power supply quality of a user positioned at the tail part of the line can be greatly influenced, the power generation amount is improved to ensure the power supply of the user, a large amount of power resources are wasted, the idea of construction and operation of a smart power grid is violated, the resource reuse rate is improved under the condition of not forcing demand side management, and the problem of adjusting the load of the peak trough of the power grid gradually draws social attention.
In the prior art, loads are dispersed, the power supply radius of a power transformation and distribution station is limited, the power supply of the whole area can be realized by long medium-voltage lines and the dispersed power transformation and distribution stations, the utilization rate of main transformers of the dispersed power transformation and distribution stations is low, most of power loss is caused in the line transmission process, active current mainly flows through the loss caused by long power transmission lines, and the terminal voltage characteristic cannot be improved by simply connecting reactive compensation equipment in parallel. If the large-capacity power quality comprehensive compensation is realized, the compensation must be realized based on the principle of active compensation. However, some existing active compensation devices require the power grid to provide extra current required for compensation by taking power from the power grid as their energy source, and the current flowing through the power transmission line causes a lot of extra line loss, and when the load exceeds a certain range, the current required for compensation increases, which in turn causes compensation failure. Therefore, a new technology is urgently needed to effectively solve the problems of voltage compensation, power quality compensation, peak-valley balance and the like and realize comprehensive management and regulation of the power transmission and distribution network.
Disclosure of Invention
In view of the above, the invention discloses a three-in-one power electronic compensation substation, which integrates and configures three key devices for power grid regulation and performs unified energy management, so that regulation of day and night peak-valley loads is realized by using an energy storage technology, energy stored in a power consumption valley period can be used as an energy source to be supplied to a voltage compensation module and an electric energy quality compensation module, and the problem of compensation failure caused by extra circuit current increase due to power taking from a power grid is effectively avoided. The invention is distributively arranged at the places of long-distance transmission lines where voltage compensation, power quality compensation, power peak regulation and new energy networking are needed, can effectively improve the power transmission quality of the whole line and realize comprehensive regulation of a power grid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a three-in-one power electronic compensation transformer substation comprises a three-phase line and a neutral line; the energy management system comprises a three-phase line, a neutral line, a power electronic compensation substation and an energy storage power supply module, wherein a voltage compensation module is connected between the input end and the output end of the three-phase line in series and in parallel, an electric energy quality compensation module and the energy storage power supply module are connected between the three-phase line and the neutral line in parallel, the output end of the three-phase line is electrically connected with the energy management module of the power electronic compensation substation through a sensing detection module, the energy management module of the power electronic compensation substation is electrically connected with the voltage compensation module, the electric energy quality compensation module and the energy storage power supply module, and the voltage compensation module.
The input end of the voltage compensation module is connected with the input end of the three-phase line and the input end of the neutral line, the output end of the voltage compensation module is connected with the output end of the three-phase line, and the voltage compensation module is used for compensating the voltage dropped by the power transmission line and improving the voltage quality to ensure that the voltage at the tail end of the line meets the power supply standard of a power grid;
the electric energy quality compensation module is connected in parallel in the electric transmission line, namely connected in parallel between the three-phase line and the neutral line, and is used for realizing the comprehensive compensation of the line current, and comprises: reactive compensation, harmonic compensation and three-phase unbalance compensation are carried out, so that the electric energy transmission quality of the power transmission line is comprehensively improved;
the energy storage power supply module is connected in parallel in the power transmission line, namely connected between a three-phase line and a neutral line, and is used for realizing load peak-valley regulation of a power grid and providing energy sources required by compensation for the voltage compensation module and the electric energy quality compensation module;
the power electronic compensation substation energy management module is connected with the voltage compensation module, the electric energy quality compensation module, the energy storage power supply module and the sensing detection module, and is used for receiving and analyzing the three-phase voltage and current information of the power transmission line acquired by the sensing detection module, comprehensively deciding to generate a control reference instruction (set value) of each sub-module, outputting the control reference instruction (set value) to a corresponding sub-module controller unit, performing coordination control, and realizing the unified management of the internal energy flow of the three-in-one power electronic compensation substation;
the sensing detection module is used for acquiring information of the power transmission line, respectively outputting the information to the voltage compensation module, the electric energy quality compensation module, the energy storage power module and the power electronic compensation transformer substation energy management module, and providing three-phase voltage and current feedback information of the operation of the power transmission line for the energy management module;
the voltage compensation module, the electric energy quality compensation module and the energy storage power supply module are connected and connected in parallel to the public direct current bus, and the public direct current bus is used for realizing the energy flow in the three-in-one power electronic compensation transformer substation.
In some embodiments of the invention, the voltage compensation module comprises: the power supply unit adopts an isolation transformer, a primary side winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is connected with the alternating current voltage regulating converter through a switching device and is used for acquiring an energy source required by a voltage compensation process from a power grid;
the direct-current side input end of the inverter is connected with the common direct-current bus and is used for acquiring an energy source required by a voltage compensation process from the common direct-current bus;
the alternating-current side input end of the alternating-current voltage regulating converter is connected with the output end of the power taking unit and the alternating-current side output end of the inverter, the alternating-current side output end of the alternating-current voltage regulating converter is connected with the primary side winding of the compensating transformer, and the alternating-current side output end of the alternating-current voltage regulating converter is used for carrying out power conversion according to the control signal output by the voltage regulating control unit, generating required compensating voltage when the circuit needs voltage compensation and outputting the required compensating voltage to the primary side winding of the compensating transformer, and realizing corresponding;
the secondary side winding of the compensation transformer is connected in series in a three-phase line and is used for compensating the compensation voltage output by the alternating-current voltage regulating converter into the power transmission line;
the output end of the voltage regulation control unit is connected with the power taking unit, the alternating current voltage regulation converter and the inverter, the input end of the voltage regulation control unit receives a given control command output by the power electronic compensation substation energy management module and three-phase voltage information output by the sensing detection module, and is used for determining the working state, the energy source and the control strategy of the voltage compensation module according to the information, when a line needs voltage compensation, a first control command is generated to control the on-off of a switch element in the power taking unit and the on-off of the switch element in the inverter so as to determine the energy supply source, a second control command is generated to be output to the alternating current voltage regulation converter to control the on-off of a corresponding switch element in the alternating current voltage regulation converter, so that corresponding compensation voltage is generated, and when the line does not need voltage compensation, corresponding elements are controlled, no compensation voltage is generated.
In some embodiments of the invention, the power quality compensation module comprises: the three-phase four-wire system inverter circuit is based on an active compensation principle, a direct current side of the three-phase four-wire system inverter circuit is connected with the common direct current bus, an alternating current side of the three-phase four-wire system inverter circuit is connected between a three-phase line and a neutral line in parallel through a reactor and used for generating compensation current which is equal to a compensated quantity (harmonic current, reactive current and three-phase unbalanced current) and opposite in phase, and the compensation current is injected into a power grid through the reactor to realize corresponding compensation of reactive power, harmonic wave, three-phase unbalanced and the like;
the input end of the power quality compensation control unit receives a given control command output by the power electronic compensation substation energy management module and the transmission line voltage and current information output by the sensing detection module, and is used for determining the working state of the power quality compensation module according to the given control command and the transmission line voltage and current information; when the circuit does not need power quality compensation, the corresponding device is controlled to be switched off, and no compensation current is generated.
The driving circuit is used for amplifying the third control instruction generated by the power quality compensation control unit and outputting the third control instruction to the three-phase four-wire inverter circuit to drive each switching device in the driving circuit to complete on and off, so that required compensation current is generated and injected into a power grid;
in some embodiments of the invention, the energy storage power module comprises: the energy storage converter adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a common direct current bus, the alternating current side of the energy storage converter is connected in parallel between a three-phase line and a neutral line of a power transmission line through a reactor and is used for realizing the bidirectional flow of energy between the energy storage power supply module and the power transmission line (power grid),
one side of the direct current side of the bidirectional DC/DC converter is connected with the energy storage battery, and the other side of the bidirectional DC/DC converter is connected to the common direct current bus and is used for performing electric energy conversion on the direct current output by the energy storage battery or the direct current input on the direct current bus (6);
the energy storage battery is used for storing energy and comprises: the electric energy absorbed from the power grid and the electric energy generated by the new energy power generation are released when the power grid is in a discharge mode, so that an energy source is provided for the voltage compensation module and the electric energy quality compensation module;
the rectifier adopts an AC/DC topology, the alternating current input side of the rectifier is connected with the access terminal of the wind turbine generator, and the direct current output side of the rectifier is connected to the common direct current bus and used for accessing alternating current electric energy generated by the wind turbine generator;
the chopper adopts a DC/DC topology, the direct current input side of the chopper is connected with a photovoltaic control access terminal, and the direct current output side of the chopper is connected to the common direct current bus and is used for accessing direct current electric energy generated by photovoltaic power generation;
the output end of the energy storage power supply module control unit is connected with the energy storage converter, the bidirectional DC/C converter, the energy storage battery, the rectifier and the chopper, and the input end of the energy storage power supply module control unit receives a given control command output by the power electronic compensation substation energy management module, three-phase voltage and current information output by the sensing detection module and energy storage battery state information, so that the working state of the energy storage power supply module is determined according to the information, corresponding device on-off signals are generated and output to the corresponding power converters respectively to control the power converters to carry out power conversion in different states, and the flow of energy in the energy storage module is completed.
In some embodiments of the invention, the power electronic compensation substation energy management module comprises: the system comprises a voltage and current information receiving unit, an electric energy quality comprehensive calculation and analysis unit, an energy storage power supply module state receiving unit, a submodule controlled given quantity comprehensive calculation decision unit, a voltage compensation module controlled given quantity output unit, an energy storage power supply module controlled given quantity output unit and an electric energy quality compensation module controlled given quantity output unit, wherein the voltage and current information receiving unit is used for receiving the three-phase voltage and current information of the power grid detected by the sensing detection unit and outputting the three-phase voltage and current information to the electric energy quality comprehensive calculation and analysis unit;
the comprehensive electric energy quality calculation and analysis unit is used for analyzing voltage and current data information in a power transmission line (power grid), acquiring the amplitude and the phase of the data information, solving information such as compensation voltage amplitude, current amplitude, three-phase unbalance, harmonic waves, line power factors and the like required by the current line and outputting the information to the submodule control given quantity comprehensive calculation decision unit;
the energy storage power supply module state receiving unit is used for receiving energy storage power supply module running state information output by the energy storage power supply module, and the running state information comprises the residual capacity of an energy storage battery, estimated generated energy and the like of new energy power generation equipment and outputting the estimated generated energy to the submodule control given quantity comprehensive calculation decision unit;
the submodule control given quantity comprehensive calculation decision unit is used for determining the quantity to be compensated and the working mode of each submodule according to power grid analysis information and state information of an energy storage power supply module in the module, calculating and generating corresponding control given quantity, and controlling the given quantity output unit through the voltage compensation module, the energy storage power supply module and the power quality compensation module to respectively output the given quantity output unit to the control unit of the corresponding submodule to control, so that unified coordination, control and management of internal energy of the power electronic compensation transformer substation are realized.
In some embodiments of the present invention, the voltage compensation module, the power quality compensation module, and the energy storage power module are connected in parallel to the common dc bus, and the relative position connection relationship of the three sub-modules may be determined according to the actual compensation condition of the line.
In some embodiments of the present invention, when the equipment is close to the end of the line and the load needs a large amount of reactive power compensation, the voltage compensation module, the power quality compensation module and the energy storage power module are connected in a first connection manner, and the connection relationship of the relative positions of the voltage compensation module, the power quality compensation module and the energy storage power module is as follows: the energy storage power supply module is close to three-phase line input and neutral input, the electric energy quality compensation module is close to three-phase line output and neutral output, the voltage compensation module is located between two parallel module connected positions.
In some embodiments of the present invention, the device is installed in a long whisker line, and when the load peak regulation demand is large, the voltage compensation module, the power quality compensation module and the energy storage power supply module adopt a second connection mode, and the connection relationship of the relative positions thereof is as follows: the electric energy quality compensation module is close to a three-phase line input end and a neutral line input end, the energy storage power supply module is close to a three-phase line output end and a neutral line output end, the voltage compensation module is located between the connection positions of the two parallel modules, and the interior of the transformer substation is connected with the three-phase line input end and the neutral line input end.
In some embodiments of the present invention, the sensing unit can employ a sampling module in the prior art, such as a Shenzhen Jiansi JSY-MK-141 series sampling module.
In some embodiments of the invention, the three-in-one power electronic compensation substation can be distributively arranged in places where voltage drop occurs, power quality compensation is needed, and power peak regulation control is needed in a long-distance power transmission line according to the actual situation of a power supply and distribution line.
Compared with the prior art, the three-in-one power electronic compensation transformer substation has the following obvious prominent substantive characteristics and obvious technical progress:
1. according to the three-in-one power electronic compensation substation, the voltage compensation module, the power quality compensation module and the energy storage module are intensively configured as key equipment for power grid adjustment, the positions of all the equipment are flexibly adjusted according to the actual condition of a line, and the equipment is distributed at the place where voltage drops occur in a power transmission line and a power distribution line, so that the voltage can be lifted in sections, the power quality is improved, the power consumption quality of a terminal user is ensured, the transmission loss of the line is greatly reduced, the peak-valley balance of the power grid is adjusted, and the comprehensive and comprehensive adjustment of the power grid is realized.
2. The voltage compensation module and the electric energy quality compensation module of the invention are compensated based on the principle of active compensation, but different from the prior art, the three-in-one power electronic compensation transformer substation of the invention utilizes the energy storage power supply module to provide an energy source for the compensation equipment during the peak time of a power grid with larger load, the energy in the energy storage module mainly comes from the energy absorbed by the low-ebb time period of the power grid and the electric energy generated by new energy power generation equipment, the design not only meets the requirement of large-capacity compensation, but also effectively avoids the phenomenon that the current of a power transmission line is additionally increased because of the high-capacity requirement when the power is taken from the power grid, the additionally increased current flows through a long-distance lead to cause a large amount of additional power loss, so that the voltage amplitude of a line after compensation falls more seriously, the problem of failure of the compensation device is caused, the problem that stable compensation cannot be realized due to unstable new energy caused by weather fluctuation day and night influence is also solved.
3. The three-in-one power electronic compensation transformer substation can effectively realize peak regulation control of a power grid through the energy storage power supply module, can uniformly manage energy through the energy management module in different running states of the power grid, and controls an energy flowing process inside the three-in-one power electronic compensation transformer substation module and an interaction process of the energy flowing process with the outside so as to realize optimal configuration of the energy and improve the utilization efficiency of the energy.
Drawings
Fig. 1 is a schematic structural diagram of a three-in-one power electronic compensation substation according to the present invention.
Fig. 2 is a schematic structural diagram of a voltage compensation module according to the present invention.
Fig. 3 is a schematic structural diagram of the power quality compensation module according to the present invention.
Fig. 4 is a schematic structural diagram of the energy storage power module of the present invention.
Fig. 5 is a schematic structural diagram of an energy management module of a power electronic compensation substation according to the present invention.
Detailed Description
In order to better explain the present invention and to facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following examples are illustrative only and do not represent or limit the scope of the present invention, which is defined by the claims.
The first embodiment is as follows:
referring to fig. 1 to 5, a three-in-one power electronic compensation substation includes a three-phase line and a neutral line; the three-phase line is connected in series and parallel with a voltage compensation module 1, an electric energy quality compensation module 2 and an energy storage power supply module 3 are connected in parallel between the three-phase line and a neutral line, a power electronic compensation substation energy management module 4 is electrically connected at the output end of the three-phase line through a sensing detection module 5, the power electronic compensation substation energy management module 4 is electrically connected with the voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3, and the voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3 are electrically connected with each other through a common direct current bus 6.
Example two:
as shown in fig. 1, a three-in-one power electronic compensation substation comprises a three-phase line, a neutral line, a voltage compensation module 1, an electric energy quality compensation module 2, an energy storage power module 3, a power electronic compensation substation energy management module 4, a sensing detection unit 5 and a common dc bus 6,
the input end of the voltage compensation module 1 is connected with the input end of a three-phase line and the input end of a neutral line, and the output end of the voltage compensation module is connected with the output end of the three-phase line and used for compensating the voltage dropped by the power transmission line and improving the voltage quality to ensure that the voltage at the tail end of the line meets the power supply standard of a power grid;
the electric energy quality compensation module 2 is connected in parallel in the transmission line, namely connected in parallel between the three-phase line and the neutral line, and is used for realizing the comprehensive compensation of the line current, and comprises: reactive compensation, harmonic compensation, three-phase unbalance compensation and the like are adopted, so that the electric energy transmission quality of the power transmission line is comprehensively improved;
the energy storage power supply module 3 is connected in parallel in the power transmission line, namely connected between the three-phase line and the neutral line, and is used for realizing load peak-valley regulation of the power grid and providing energy sources for the voltage compensation module 1 and the electric energy quality compensation module 2;
the energy management module 4 of the power electronic compensation substation is connected with the voltage compensation module 1, the power quality compensation module 2, the energy storage power supply module 3 and the sensing detection module 5, and is used for receiving and analyzing the three-phase voltage and current information of the power transmission line acquired by the sensing detection module, acquiring the running state of the submodules in an information interaction mode, carrying out comprehensive decision-making, generating a control reference instruction (set value) of each submodule and outputting the control reference instruction to a corresponding submodule controller unit, carrying out coordination control and realizing the unified management of the internal energy flow of the three-in-one power electronic compensation substation;
the sensing detection unit 5 is used for acquiring information of the power transmission line, outputting the information to the voltage compensation module 1, the power quality compensation module 2, the energy storage power module 3 and the power electronic compensation substation energy management module 4, and providing real-time feedback information of three-phase voltage and current of the power transmission line for the information;
the voltage compensation module 1, the electric energy quality compensation module 2 and the energy storage power supply module 3 are connected in parallel to a common direct current bus 6, and the common direct current bus 6 is used for realizing the energy flow in the three-in-one power electronic compensation transformer substation.
It should be noted that the system structure diagram shown in fig. 1 is a schematic diagram of the first connection relationship of the present invention, and in some other embodiments of the present invention, a second connection relationship may be adopted, that is, the positions of the power quality compensation module 2 and the energy storage power supply module 3 are interchanged, and the specific connection relationship of the three sub-modules may be configured according to the actual requirements of the circuit.
The voltage compensation 1 module, as shown in fig. 2, includes: the system comprises a power taking unit 11, a compensating transformer 12, an alternating current voltage regulating converter 13, an inverter 14 and a voltage regulating control unit 15, wherein in the embodiment, the power taking unit 11 adopts an isolation transformer, a primary side winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is connected with the alternating current voltage regulating converter 13 through a switching device and is used for obtaining an energy source required by a voltage compensation process from a power grid; the direct-current side input end of the inverter 14 is connected with the common direct-current bus 6 and is used for acquiring an energy source required by a voltage compensation process from the common direct-current bus 6; a secondary side winding of the compensating transformer 12 is connected in series in a three-phase line, and a primary side winding is connected with an output end of an alternating current side of the alternating current voltage regulating converter 13 and is used for coupling the compensating voltage output by the alternating current voltage regulating converter 13 into a power transmission line; in this embodiment, the ac voltage regulating converter 13 is a triac ac voltage regulating circuit, the output terminal of the ac voltage regulating converter 13 is connected to the primary winding of the compensation transformer 12, the input port of the ac side includes two sets of terminal buttons, one set is connected to the output terminal of the power taking unit 11, the other group is connected with the output end of the alternating current side of the inverter 14, the terminal button connected with the electricity taking unit 11 is used for obtaining the energy required by compensation from the power grid, while the terminal connected to the inverter 14 is used to take the energy required for compensation from the common dc bus 6 inside the power electronic compensation substation, by controlling the on/off of the switching device S in the power taking unit 11 and the on/off of the switching device in the inverter, the energy source of the alternating current side of the alternating current voltage regulating converter can be selected, and the energy source is arranged in a power grid or a power electronic compensation substation. The output end of the voltage regulation control unit 15 is connected with the power taking unit 11, the alternating current voltage regulation converter 13 and the inverter 14, and the input end of the voltage regulation control unit receives given control information (including voltage amplitude and phase) output by the power electronic compensation substation energy management module 4 and line voltage information (including voltage amplitude and phase) output by the sensing detection module 5 for voltage closed-loop control. When the line needs voltage compensation, the voltage regulation control unit 15 generates a first control instruction to control the on-off of a switch device in the power taking unit (11) and the on-off of a switch device S in the inverter (14) so as to determine an energy supply source, when the power grid is in a peak period, the control principle of the first control instruction is to turn off the switch device S, the energy source provided by the energy storage power supply module 3 is selected to be accessed through the inverter 14, and if the power grid is in a low valley period, the control principle of the first control instruction is to close the switch device S, and the energy source provided by the power grid accessed through the power taking unit 11 is selected. Meanwhile, the voltage regulation control unit 15 can generate a second control instruction to be output to the alternating current voltage regulation converter (13) to control the on-off of a corresponding switch device in the alternating current voltage regulation converter so as to generate corresponding compensation voltage, and when the voltage compensation is not needed in the circuit, the corresponding device is controlled to be switched off, and the compensation voltage is not generated. In some other embodiments of the present invention, the AC voltage regulating converter may adopt any circuit topology capable of achieving AC/AC voltage regulation in the prior art, including: an ac-ac frequency circuit (not used for changing the frequency but for changing the voltage), an ac-dc-ac frequency circuit, an ac chopper circuit, and the like.
The power quality compensation module 2, as shown in fig. 3, includes: the system comprises a three-phase four-wire system inverter circuit 21, a driving circuit 22 and an electric energy quality compensation control unit 23, wherein the three-phase four-wire system inverter circuit 21 adopts a diode-clamped three-level inverter circuit, a direct current side is connected with the common direct current bus 6, an alternating current side is connected between a three-phase line and a neutral line in parallel through a reactor, based on the principle of active compensation, compensation currents with the same magnitude and opposite phases with compensated quantities (harmonic current, reactive current and three-phase unbalanced current) are generated according to control signals, and the compensation currents are injected into a power grid through the reactor to realize corresponding compensation of reactive power, harmonic wave, three-phase unbalance and the like; the input end of the power quality compensation control unit 23 receives the given control information output by the power electronic compensation substation energy management module 4 and the three-phase voltage and current information output by the sensing detection module 5, and determines the working state of the power quality compensation module 2 according to the control information, when the line needs power quality compensation, the closed-loop control is performed according to the given compensation amount input by the power electronic energy management module 4 and the three-phase current information detected by the sensing detection module 5 in real time, a current type PWM controller is adopted to generate a corresponding third control instruction and output the third control instruction to the driving circuit 22, the driving circuit 22 amplifies the third control instruction generated by the power quality compensation control unit 23 and outputs the third control instruction to the three-phase four-wire control inverter circuit (21) to drive each internal switching device to complete on and off, thereby generating the required compensation current to be injected into the power grid; when the circuit does not need power quality compensation, the corresponding device is controlled to be switched off, and no compensation current is generated.
As shown in fig. 4, the energy storage power supply module 3 includes: an energy storage converter 31, a bidirectional DC/DC converter 32, an energy storage battery 33, a rectifier 34, a chopper 35 and an energy storage power module control unit 36. The energy storage converter adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a public direct current bus (6), and the alternating current side of the energy storage converter is connected in parallel between a three-phase line and a neutral line of a power transmission line through a reactor and used for realizing the bidirectional flow of energy between the energy storage power supply module and the power transmission line (power grid). When working in the forward power conversion state, the energy storage converter 31 works in the rectifier state to absorb energy fed back by the power grid, and when working in the reverse power conversion state, the energy storage converter 31 works in the inverter state to inject energy into the power grid; the bidirectional DC/DC converter adopts a bidirectional buck-boost circuit topology, the low-voltage side of the bidirectional DC/DC converter is connected with the energy storage battery, and the high-voltage side of the bidirectional DC/DC converter is connected to the common direct current bus and is used for performing bidirectional electric energy conversion on direct current output by the energy storage battery or direct current input on the direct current bus 6; the energy storage battery 33 is used for storing energy and comprises: the electric energy absorbed from the power grid and the electric energy generated by the new energy power generation are released when the power grid is in a discharge mode, so that energy sources are provided for the voltage compensation module 1 and the electric energy quality compensation module 2; the rectifier 34 adopts an AC/DC topology, an alternating current input side is connected with an access terminal of the wind turbine generator, and a direct current output side is connected to the common direct current bus and used for accessing electric energy generated by the wind turbine generator; the chopper 35 adopts a DC/DC topology, the direct current input side of the chopper is connected with a photovoltaic control access terminal, and the direct current output side of the chopper is connected to the common direct current bus and is used for accessing electric energy generated by photovoltaic power generation; the output end of the energy storage power supply module control unit 36 is connected with other units (31-35) of the energy storage power supply module, the input end of the energy storage power supply module control unit receives a given control command output by the power electronic compensation substation energy management module 4, three-phase voltage and current information output by the sensing detection module 5 and state information of the energy storage battery 33, the working state of the energy storage power supply module 3 is determined according to the information, and corresponding device on-off signals are generated and output to corresponding power converters respectively to control the power converters to perform power conversion in different states so as to realize the flowing of energy in the energy storage module.
As shown in fig. 5, the power electronic compensation substation energy management module 4 includes: the system comprises a voltage and current information receiving unit 41, an electric energy quality comprehensive calculation and analysis unit 42, an energy storage power supply module state receiving unit 43, a submodule control given quantity comprehensive calculation decision-making unit 44, a voltage compensation module control given quantity output unit 45, an energy storage power supply module control given quantity output unit 46 and an electric energy quality compensation module control given quantity output unit 47, wherein the voltage and current information receiving unit 41 receives electric network three-phase voltage and current information U detected by a sensing detection module 5abc、IabcAnd outputs it to the power quality comprehensive calculation and analysis unit 42 for analysis; the power quality comprehensive calculation and analysis unit 42 is used for analyzing the voltage and current data information in the power transmission line (power grid), obtaining the amplitude and phase of the data, and solving the amplitude of the compensation voltage required by the current lineInformation such as current amplitude, three-phase unbalance, harmonic wave, line power factor and the like is output to the submodule control given quantity comprehensive calculation decision unit 44; the energy storage power module state receiving unit 43 receives the energy storage power module running state information output by the energy storage power module 3, including the residual capacity of the energy storage battery, the estimated generated energy of the new energy power generation equipment and the like, and outputs the information to the submodule control given quantity comprehensive calculation decision unit 44; the sub-module control given quantity comprehensive calculation decision unit 44 determines the quantity to be compensated and the working mode of each sub-module according to the power grid analysis information and the state information of the energy storage power supply module in the module, calculates and generates corresponding control given quantity, and respectively outputs the control given quantity to the control unit of the corresponding sub-module through the voltage compensation module control given quantity output unit 45, the energy storage power supply module control given quantity output unit 46 and the electric energy quality compensation module control given quantity output unit 47 to control, so that the unified coordination, control and management of the internal energy of the power electronic compensation substation are realized.
The three-in-one power electronic compensation transformer substation can be arranged at a place where voltage drop, power quality compensation and power peak regulation control are needed in a long-distance power transmission line in a distributed mode according to the actual situation of a power supply and distribution line. The three-in-one power electronic compensation substation integrates and configures three key devices for power grid regulation and performs unified energy management, not only realizes regulation of day and night peak-valley loads by using an energy storage technology, but also can supply energy stored in a power consumption valley period to the voltage compensation module and the electric energy quality compensation module as an energy source, effectively avoids the problem of compensation failure caused by extra increase of line current due to power taking from a power grid, and effectively realizes comprehensive regulation and comprehensive promotion of power transmission.
It will thus be seen that the objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments may be modified without departing from the principles. The invention includes all modifications encompassed within the spirit and scope of the claims.
Claims (7)
1. A three-in-one power electronic compensation transformer substation comprises a three-phase line and a neutral line; the method is characterized in that: the voltage compensation module (1) is used for compensating the voltage dropped by the power transmission line, improving the voltage quality and enabling the voltage at the tail end of the line to accord with the power supply standard of a power grid;
connect an electric energy quality compensation module (2) between three-phase line and the neutral conductor in parallel, electric energy quality compensation module (2) are used for realizing the comprehensive compensation of line current, include: reactive compensation, harmonic compensation and three-phase unbalance compensation are carried out, so that the electric energy transmission quality of the power transmission line is comprehensively improved;
an energy storage power supply module (3) is connected between the three-phase line and the neutral line in parallel, and the energy storage power supply module (3) is used for realizing load peak-valley regulation of a power grid and providing energy sources required by compensation for the voltage compensation module (1) and the electric energy quality compensation module (2);
the power electronic compensation substation energy management module (4) is electrically connected with the voltage compensation module (1), the electric energy quality compensation module (2), the energy storage power supply module (3) and the sensing detection module (5), and is used for receiving and analyzing three-phase voltage and current information of the power transmission line acquired by the sensing detection module (5), comprehensively deciding to generate a control reference instruction (set value) of each sub-module, outputting the control reference instruction to a corresponding sub-module controller unit, and performing coordination control to realize the unified management of the internal energy flow of the three-in-one power electronic compensation substation;
the sensing detection module (5) is used for acquiring information of the power transmission line, outputting the information to the voltage compensation module (1), the power quality compensation module (2), the energy storage power supply module (3) and the power electronic compensation transformer substation energy management module (4) respectively, and providing three-phase voltage and current feedback information of the operation of the power transmission line for the information;
the three-in-one power electronic compensation transformer substation is characterized in that the voltage compensation module (1), the electric energy quality compensation module (2) and the energy storage power supply module (3) are connected in parallel to the public direct current bus (6) together, and the public direct current bus (6) is used for realizing the energy flow inside the three-in-one power electronic compensation transformer substation.
2. The three-in-one power electronic compensation substation of claim 1, characterized in that: the voltage compensation module (1) comprises: the power supply system comprises a power taking unit (11), a compensating transformer (12), an alternating current voltage regulating converter (13), an inverter (14) and a voltage regulating control unit (15), wherein the power taking unit (11) adopts an isolation transformer, a primary side winding of the isolation transformer is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is connected with the alternating current voltage regulating converter (13) through a switching element and is used for obtaining an energy source required by a voltage compensation process from a power grid;
the direct-current side input end of the inverter (14) is connected with the common direct-current bus (6) and is used for acquiring an energy source required by a voltage compensation process from the common direct-current bus (6);
the alternating current side input end of the alternating current voltage regulating converter (13) is connected with the output end of the power taking unit (11) and the alternating current side output end of the inverter (14), the alternating current side output end of the alternating current voltage regulating converter (13) is connected with the primary side winding of the compensating transformer (12) and used for carrying out power conversion according to the control signal output by the voltage regulating control unit (15), and when the circuit needs voltage compensation, required compensation voltage is generated and output to the primary side winding of the compensating transformer (12), so that corresponding voltage compensation of the circuit is realized;
a secondary side winding of the compensating transformer (12) is connected in series in a three-phase line and is used for coupling the compensating voltage output by the alternating-current voltage regulating converter (13) into a power transmission line;
the output end of the voltage regulation control unit (15) is connected with the power taking unit (11), the alternating current voltage regulation converter (13) and the inverter (14), the input end of the voltage regulation control unit (15) receives a given control command output by the power electronic compensation substation energy management module (4) and three-phase voltage information output by the sensing detection module (5) and is used for determining the working state, the energy source and the control strategy of the voltage compensation module according to the given control command and the three-phase voltage information, when a circuit needs voltage compensation, a first control command is generated to control the on-off of a switch device in the power taking unit (11) and the on-off of a switch device in the inverter (14) so as to determine the energy supply source, a second control command is generated to be output to the alternating current voltage regulation converter (13) and control the on-off of the corresponding switch device in the alternating, therefore, the corresponding compensation voltage is generated, and when the voltage compensation is not needed in the circuit, the corresponding device is controlled to be switched off, and the compensation voltage is not generated.
3. The three-in-one power electronic compensation substation of claim 1, characterized in that: the power quality compensation module (2) comprises: the three-phase four-wire system inverter circuit (21) is based on an active compensation principle, the direct current side of the three-phase four-wire system inverter circuit is connected with the common direct current bus (6), the alternating current side of the three-phase four-wire system inverter circuit is connected between a three-phase line and a neutral line in parallel through a reactor and used for generating compensation current which is equal to the value of a compensated quantity (harmonic current, reactive current and three-phase unbalanced current) and has opposite phases, and the compensation current is injected into a power grid through the reactor to realize corresponding reactive, harmonic and three-phase unbalanced compensation;
the input end of the power quality compensation control unit (23) receives a given control command output by the power electronic compensation substation energy management module (4) and three-phase current information output by the sensing detection module (5), and is used for determining the working state of the power quality compensation module according to the given control command and the three-phase current information; when the circuit does not need power quality compensation, the corresponding device is controlled to be switched off, and no compensation current is generated.
The driving circuit (22) is used for amplifying the third control instruction generated by the power quality compensation control unit (23) and outputting the third control instruction to the three-phase four-wire inverter circuit (21), and driving each switching device inside the driving circuit to complete on and off, so that required compensation current is generated and injected into a power grid.
4. The three-in-one power electronic compensation substation of claim 1, characterized in that: the energy storage power supply module (3) comprises an energy storage converter (31), a bidirectional DC/DC converter (32), an energy storage battery (33), a rectifier (34), a chopper (35) and an energy storage power supply module control unit (36), wherein the energy storage converter (31) adopts a reversible PWM rectifier topology, the direct current side of the energy storage converter is connected with a common direct current bus (6), and the alternating current side of the energy storage converter is connected in parallel between a three-phase line and a neutral line of a power transmission line through a reactor and used for realizing bidirectional flow of energy between the energy storage power supply module (3) and the power transmission line (power grid); (ii) a
One side of the direct current side of the bidirectional DC/DC converter (32) is connected with the energy storage battery (33), and the other side of the bidirectional DC/DC converter is connected to the common direct current bus (6) and is used for converting the direct current output by the energy storage battery (33) or the direct current input on the direct current bus (6) into electric energy;
the energy storage battery (33) is used for storing energy and comprises: the electric energy absorbed from the power grid and the electric energy generated by the new energy generation are released when in a discharge mode, and energy sources are provided for the voltage compensation module (1) and the electric energy quality compensation module (2);
the rectifier (34) adopts an AC/DC topology, the alternating current input side of the rectifier is connected with the access terminal of the wind generating set, and the direct current output side of the rectifier is connected to the common direct current bus (6) and is used for accessing alternating current electric energy generated by the wind generating set;
the chopper (35) adopts a DC/DC topology, the direct current input side of the chopper is connected with a photovoltaic control access terminal, and the direct current output side of the chopper is connected to the common direct current bus (6) and is used for accessing direct current electric energy generated by photovoltaic power generation;
the output end of the energy storage power supply module control unit (36) is connected with the energy storage converter (31), the bidirectional DC/C converter (32), the energy storage battery (33), the rectifier (34) and the chopper (35), the input end of the energy storage power supply module control unit receives a given control command output by the power electronic compensation substation energy management module (4), three-phase voltage and current information output by the sensing detection module (5) and energy storage battery state information, the three-phase voltage and current information is used for determining the working state of the energy storage power supply module according to the information, generating corresponding device on-off signals and outputting the signals to corresponding power converters respectively to control the power converters to carry out power conversion in different states, and therefore the flow of energy inside the energy storage module is completed.
5. The three-in-one power electronic compensation substation of claim 1, characterized in that: the energy management module (4) of the power electronic compensation transformer substation comprises a voltage and current information receiving unit (41), an electric energy quality comprehensive calculation and analysis unit (42), an energy storage power supply module state receiving unit (43), a submodule control given quantity comprehensive calculation decision unit (44), a voltage compensation module control given quantity output unit (45), an energy storage power supply module control given quantity output unit (46) and an electric energy quality compensation module control given quantity output unit (47), wherein the voltage and current information receiving unit (41) is used for receiving the three-phase voltage and current information of the power grid detected by the sensing detection module (5) and outputting the three-phase voltage and current information to the electric energy quality comprehensive calculation and analysis unit (42);
the electric energy quality comprehensive calculation and analysis unit (42) is used for analyzing voltage and current data information in a power transmission line (power grid), obtaining the amplitude and the phase of the data, solving the information of compensation voltage amplitude, current amplitude, three-phase unbalance, harmonic and line power factor required by the current line and outputting the information to the submodule control given quantity comprehensive calculation decision unit (44);
the energy storage power supply module state receiving unit (43) is used for receiving energy storage power supply module running state information output by the energy storage power supply module (3), wherein the information comprises the residual capacity of an energy storage battery, and the new energy power generation equipment estimates generated energy and outputs the estimated generated energy to the submodule to control a given energy comprehensive calculation decision unit (44);
the submodule control given quantity comprehensive calculation decision unit (44) is used for determining the quantity to be compensated and the working mode of each submodule according to the power grid analysis information and the state information of the energy storage power supply module in the submodule, calculating and generating corresponding control given quantity, and respectively outputting the control given quantity to the control units of the corresponding submodules through the voltage compensation module control given quantity output unit (45), the energy storage power supply module control given quantity output unit (46) and the electric energy quality compensation module control given quantity output unit (47), so that unified coordination, control and management of the internal energy of the power electronic compensation substation are realized.
6. The three-in-one power electronic compensation substation of claim 1, characterized in that: in the three-in-one power electronic compensation transformer substation, the relative position connection relation among the voltage compensation module (1), the electric energy quality compensation module (2) and the energy storage power supply module (3) adopts any one of a first connection mode and a second connection mode:
the first connection mode is that the energy storage power supply module (3) is close to a three-phase line input end and a neutral line input end, the electric energy quality compensation module (2) is close to a three-phase line output end and a neutral line output end, and the voltage compensation module (1) is located between the two parallel modules in a connection position.
The second connected mode is that electric energy quality compensation module (2) are close to three-phase line input and neutral input, energy storage power module (3) are close to three-phase line output and neutral output, voltage compensation module (1) are located in the middle of two parallel module hookup locations.
7. The three-in-one power electronic compensation substation of claim 1, characterized in that: the three-in-one power electronic compensation transformer substation can be arranged at a place where voltage drop, power quality compensation and power peak regulation control are needed in a long-distance power transmission line in a distributed mode according to the actual situation of a power supply and distribution line.
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