CN213367416U - System suitable for power supply radius extension in load sparse region - Google Patents
System suitable for power supply radius extension in load sparse region Download PDFInfo
- Publication number
- CN213367416U CN213367416U CN202021312814.6U CN202021312814U CN213367416U CN 213367416 U CN213367416 U CN 213367416U CN 202021312814 U CN202021312814 U CN 202021312814U CN 213367416 U CN213367416 U CN 213367416U
- Authority
- CN
- China
- Prior art keywords
- power
- output end
- energy storage
- input end
- compensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model discloses a system that is fit for sparse area power supply radius of load and extends, this system includes: the system comprises a compensation transformer system, an energy storage and conversion system and a sensing and control unit. The utility model discloses an energy storage and energy conversion system not only can realize the regulation of peak valley load round clock, still can supply with the compensating transformer system as the current source when load peak period circuit terminal voltage seriously falls, realize the promotion of terminal voltage under the condition that does not cause extra line loss as far as possible, effectively extend the power supply service radius. Meanwhile, the compensation of the problems of reactive power, harmonic waves, three-phase imbalance and the like of the power grid can be realized in the process of charging and discharging the energy storage system. The utility model discloses combine together compensating transformer and energy storage technique, power electronic transformation technique, have the significance to solving western region voltage drop serious, the big power supply difficult problem such as line loss.
Description
Technical Field
The utility model belongs to the circuit arrangement or the system of power supply or distribution, concretely relates to alternating current transmission line or the system that the alternating current distribution network power supply radius extends.
Background
Poor economic benefit and low input-output ratio of power grid construction in load-dispersed areas are commonly faced by power grid companies all over the worldThe problem of how to provide suitable power supply services to the population in load-dispersed areas in an economical manner has become a worldwide hot issue. Research shows that the traditional power generation and distribution system is only suitable for residential areas with higher population density, and the traditional power generation and distribution system is lower in user density (lower than 70 users// km)2) In rural remote areas, the problems of low power supply voltage at the tail end of a line and unqualified power quality easily occur due to large power supply radius. In addition, with the continuous increase of user load and the continuous increase of single-point large load, the power supply quality of the users at the tail part of the line can be more influenced by the fluctuation of the wave crests and the wave troughs of the day and night power grid.
The load is dispersed, the power supply radius of the power transformation and distribution station is limited, and the power supply of the whole area can be realized by long medium-voltage lines and the dispersed power transformation and distribution station. The utilization rate of the main transformer of the distributed transformer substation is low, most of power loss is caused in the process of line transmission, and the terminal voltage characteristic cannot be improved by simply connecting reactive compensation equipment in parallel mainly due to the loss caused by the fact that active current flows through a long transmission line. In order to ensure the power utilization quality of end users, it is urgently needed to extend the power supply service radius of a load sparse area through a technical means, and ensure the power transmission quality of long-distance transmission under the condition of not building a new substation.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a system that is fit for load sparse area power supply radius extension, this system includes: the system comprises a compensation transformer system, an energy storage and conversion system and a sensing and control unit. The utility model discloses an energy storage and energy conversion system not only can realize the regulation of peak valley load round clock, still can supply with the compensating transformer system as the current source when load peak period circuit terminal voltage seriously falls, realize the promotion of terminal voltage under the condition that does not cause extra line loss as far as possible, effectively extend the power supply service radius. Meanwhile, the compensation of the problems of reactive power, harmonic waves, three-phase imbalance and the like of the power grid can be realized in the process of charging and discharging the energy storage system. The utility model discloses combine together compensating transformer and energy storage technique, power electronic transformation technique, have the significance to solving western region voltage drop serious, the big power supply difficult problem such as line loss.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system suitable for power supply radius extension in a load sparse area comprises a three-phase line, a neutral line, a compensation transformer system, an energy storage and energy conversion system and a sensing and control unit;
the input end of the compensation transformer system comprises a three-phase line input end and a neutral line input end, the output end of the compensation transformer system comprises a three-phase line output end and a neutral line output end, the compensation transformer system is used for compensating voltage dropped by long-distance transmission of the power transmission line, and the voltage of the line is boosted in sections so that the voltage at the tail end of the line meets the standard;
the input end of the energy storage and conversion system comprises a three-phase line input end and a neutral line input end, the output end comprises a three-phase line output end and a neutral line output end, when the voltage of the power transmission line falls below the allowable fluctuation range of the power grid, the energy storage and conversion system can be regarded as a current source and used for providing current required by compensation for the compensation transformer system, meanwhile, compensation for the problems of reactive power, harmonic waves, three-phase imbalance and the like of the line is completed in the discharging process, when the voltage amplitude of the power transmission line does not need compensation in the normal range, the energy storage and conversion system can be regarded as a load and used for storing energy fed back by the power grid, peak-valley load regulation is realized, and compensation for the problems of reactive power, harmonic waves, three-phase imbalance and the like;
the input end of the sensing and control unit is a three-phase line input end, the output end of the sensing and control unit is connected with the compensating transformer system and the energy storage and energy conversion system, the sensing and control unit is used for detecting and analyzing the voltage and current information of the power transmission line, determining the working mode of the system and outputting related control instructions to the two subsystems,
the specific connection relationship between the compensation transformer system and the energy storage and energy conversion system comprises two topologies: the left side is even formula structure and right side is even formula structure, wherein, a left side is even formula structure does energy storage and energy conversion system is close to three-phase line input and neutral input, the compensating transformer system is close to three-phase line output and neutral output, promptly energy storage and energy conversion system warp be connected to three-phase line output and neutral output behind the compensating transformer system, wherein, a right side is even formula structure does the compensating transformer system is close to three-phase line input and neutral input, energy storage and energy conversion system are close to three-phase line output and neutral output, promptly the compensating transformer system warp be connected to three-phase line output and neutral output behind energy storage and the energy conversion system.
In some embodiments of the invention, the compensation transformer system comprises: the power supply system comprises a power taking unit, a compensating transformer, an alternating current voltage regulating converter and a voltage regulating control unit, wherein the input end of the power taking unit is connected with the output end of the energy storage and energy conversion system and is connected between a three-phase line and a neutral line in parallel, and the output end of the power taking unit is connected with the alternating current voltage regulating converter and is used for acquiring energy (including voltage and current) required by a voltage compensation process from a power supply line; the secondary side winding of the compensation transformer is connected in series in a power supply line, and the primary side winding is connected with the output end of the alternating current side of the alternating current voltage regulating converter and is used for coupling the compensation voltage output by the alternating current voltage regulating converter into the power supply line so as to realize line voltage regulation; the alternating-current side input end of the alternating-current voltage regulating converter is connected with the output end of the power taking unit, 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 performing power conversion according to the control signal output by the voltage regulating control unit, generating required compensating voltage when a circuit needs voltage compensation and outputting the required compensating voltage to the compensating transformer to realize corresponding voltage compensation; the output end of the voltage regulation control unit is connected with the alternating current voltage regulation converter, the input end of the voltage regulation control unit receives the control signal output by the sensing and control unit, the control signal is used for determining the working state of the compensating transformer system according to the control signal, when the line needs voltage compensation, a corresponding device on-off control signal is generated and output to the alternating current voltage regulation converter, the corresponding compensating voltage is controlled to be generated, and when the line does not need voltage compensation, the corresponding device is controlled to be switched off, and the compensating voltage is not generated.
In some embodiments of the invention, the energy storage and conversion system comprises: the AC/DC bidirectional converter works in an inverter state and can be regarded as a current source when the energy storage and energy conversion system is in a discharge mode, the AC/DC bidirectional converter provides current required by compensation for the compensation transformer system in a mode of injecting current into the power grid, the compensation of the problems of line reactive power, harmonic wave, three-phase imbalance and the like is realized in the discharge process, and when the energy storage and energy conversion system is in a charge mode, the AC/DC bidirectional converter works in a rectifier state, the device is used for absorbing current fed back by a power grid and compensating the problems of reactive power, harmonic waves, three-phase imbalance and the like of a line in the charging process; the high-voltage direct-current side of the DC/DC boost converter is connected with a direct-current side port of the AC/DC bidirectional converter, and the low-voltage direct-current side of the DC/DC boost converter is connected with the output end of the energy storage battery and the management system thereof and is used for performing bidirectional conversion on direct current output by the energy storage battery and direct current obtained by rectification of a power grid; the output port of the energy storage battery and the management system thereof is connected with the low-voltage direct-current side of the DC/DC boost converter, and is used for providing an energy source for the whole system when working in a discharge mode and absorbing and storing energy fed back by a power grid when working in a charge mode; the output end of the power conversion control unit is connected with the AC/DC bidirectional converter, the DC/DC boost converter, the energy storage battery and the management system thereof, and the input end of the power conversion control unit receives the control signal output by the sensing and control unit, and is used for determining the working state of the energy storage and energy conversion system according to the control signal, generating corresponding device on-off control signals and outputting the corresponding device on-off control signals to the three sub-modules to control the three sub-modules to complete corresponding power conversion under a charging or discharging working mode.
In some embodiments of the present invention, the sensing and control unit comprises: the power grid voltage and current data acquisition unit is connected with a power grid at the input end and is used for acquiring voltage and current data information of the power grid in real time and outputting the voltage and current data information to the power flow analysis module; the input end of the power flow analysis module is connected with the output end of the power grid voltage and current data acquisition unit and 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 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 working mode decision module; the input end of the working mode decision module is connected with the output end of the power flow analysis module and is used for determining the overall working mode of the system according to the analysis result of the power flow analysis module and respectively outputting the working mode to the working mode decision output module of the compensation transformer system and the working mode decision output module of the energy storage and energy conversion system; the compensation transformer system working mode decision output module is connected with the output end of the working mode decision module, receives the control instruction output by the working mode decision module and outputs the required compensation voltage amplitude as a set signal to the compensation transformer system; the working mode decision output module of the energy storage and energy conversion system is connected with the output end of the working mode decision module, receives the control instruction output by the working mode decision output module, and outputs the current amplitude value to be compensated to the energy storage and energy conversion system as a set signal.
The utility model discloses an among some concrete examples, above-mentioned whole realization system can carry out the distributed configuration according to the circuit condition, the circuit along the line, thereby the segmentation promotes voltage, reduces the circuit loss and ensures end user electric energy quality, effectively extends the power supply radius.
In some embodiments of the present invention, the power-taking unit in the compensation transformer system adopts an isolation transformer, the primary side winding of which is connected between the three-phase line and the neutral line in parallel to the input end of the power-taking unit, and the secondary side winding of which is connected between the three-phase line and the neutral line to the output end of the power-taking unit, and the ac voltage-regulating converter is connected.
In some embodiments of the present invention, the power-taking unit in the compensation transformer system does not adopt an isolation transformer, and is directly connected to the ac voltage-regulating converter between the three-phase line and the neutral line through a wire.
The utility model discloses an in some concrete examples, among the above-mentioned compensating transformer system get the electric unit with compensating transformer's concrete connection relation has two kinds of topologies: a left side is got electric formula compensating transformer system structure and is got electric formula compensating transformer system structure on the right side, wherein, a left side is got electric formula compensating transformer system structure get the electric unit and be located compensating transformer's front end, promptly get the electric unit and be close to three-phase line input and neutral conductor input, a right side is got electric formula compensating transformer system structure compensating transformer is located get the front end of electric unit, promptly compensating transformer is close to three-phase line input and neutral conductor input, compensating transformer system adopt a left side to get electric formula compensating transformer system structure or a right side is got electric formula compensating transformer system structure by compensating transformer system with the concrete junction relation decision of energy storage and energy conversion system.
The utility model discloses an among some concrete examples, this system that is fit for sparse area of load power supply radius and extends adopts a left side even formula structure, and the compensating transformer system adopts left side electricity-taking type compensating transformer system structure.
The utility model discloses an among some concrete examples, this system that is fit for sparse area of load power supply radius and extends adopts the right side to link formula structure, and the compensating transformer system adopts right side electricity-taking formula compensating transformer system structure.
In some embodiments of the present invention, the working mode decision module comprises the following working mode decision steps:
the method comprises the following steps: judging whether the voltage needs to be compensated or not, if not, not compensating the compensation transformer system, and enabling the energy storage and energy conversion system to enter a charging mode, and receiving and storing feedback energy of the power grid; if compensation is needed, entering the step two for judgment;
step two: judging whether the power grid is in a peak time period or not, if the power grid is not in the peak time period, namely the load is in a load range which can be independently compensated by the compensation transformer system, independently performing voltage compensation by the compensation transformer system, and providing the required compensation current by the power grid; if the power grid is in the peak time period, entering the third step for judgment;
step three: judging whether the electric energy stored in the energy storage and energy conversion system is enough to meet the current required by the compensation transformer system, and if the electric energy meets the compensation current required by the voltage compensation of the compensation transformer system, independently providing the current required by the compensation by the energy storage and energy conversion system; if the compensation current required by the voltage compensation of the compensation transformer system is not met, the energy storage and energy conversion system and the power grid together provide the current required by the compensation, the current output by the energy storage and energy conversion system is preferentially used, and the insufficient current is provided by the power grid.
Compared with the prior art, the utility model discloses a system that is fit for sparse regional power supply radius of load and extends has following profitable technological effect:
(1) the utility model discloses a system suitable for load sparse area power supply radius extension combines together compensating transformer technique with energy storage technology, power electronic transformation technique, under the condition of not newly-built transformer substation, through this system of distributed configuration on the circuit, the sectional lifting voltage of accessible guarantees end user's power consumption quality, reduces the line transmission loss by a wide margin, has solved western area load dispersion effectively, voltage drop is big, power supply difficult problems such as loss is big;
(2) the utility model discloses an energy storage and energy conversion system in the system that the sparse area power supply radius of suitable load extends not only can realize the regulation of electric wire netting peak valley load round clock, and when electric wire netting peak period terminal voltage drops seriously, can supply with compensating transformer as the current source, for it provides because of the required extra electric current that increases of compensation. In the voltage regulating means in the prior art, for example, an autotransformer, a load voltage regulation device and other devices are installed in a power transmission line, if energy comes from a power grid, the devices can be used as a load while raising voltage, so that a part of current is additionally added to the power grid, and the current is increased along with the increase of the amplitude of the required compensation voltage. When the current is provided by a power supply of a power grid, a large amount of power loss is additionally caused in the process of flowing through a long-distance transmission line, the voltage dropped on the line is increased, and the voltage dropped after the tail end voltage is compensated is more serious due to the positive feedback effect. The invention provides the increased current required by the compensation through the energy storage and energy conversion system, so that the additional loss caused by the current flowing through a long-distance power transmission line is successfully avoided, and the phenomena that the terminal voltage drop is more serious and the compensation device fails due to the positive feedback effect are avoided.
Drawings
Fig. 1 is a schematic diagram of a left-connected structure of the system of the present invention.
Fig. 2 is a schematic diagram of a right-connected structure of the system of the present invention.
Fig. 3 is the utility model discloses a left side of compensating transformer system gets electric formula schematic diagram.
Fig. 4 is the utility model discloses a right side of compensating transformer system gets electric formula schematic diagram.
Fig. 5 is a schematic structural diagram of the energy storage and conversion system of the present invention.
Fig. 6 is a schematic structural diagram of the sensing and control unit of the present invention.
Fig. 7 is a schematic view of the operation mode determination process of the present invention.
Detailed Description
In order to better explain the present invention and to facilitate understanding of the technical solutions of the present invention, the present invention will be further described in detail 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 to be controlled by the appended claims.
The first embodiment is as follows:
as shown in fig. 1, the system for realizing power supply radius extension suitable for the load sparse area comprises a three-phase line, a neutral line, a compensation transformer system 1, an energy storage and conversion system 2 and a sensing and control unit 3, wherein,
the input end of the compensating transformer system 1 comprises a three-phase line input end and a neutral line input end, and the output end comprises a three-phase line output end and a neutral line output end, and is used for compensating the voltage dropped by a power transmission and supply line and increasing the line voltage in sections so that the line terminal voltage meets the standard;
the input end of the energy storage and conversion system 2 comprises a three-phase line input end and a neutral line input end, the output end comprises a three-phase line output end and a neutral line output end, when the voltage of the power transmission line falls below the allowable fluctuation range of the power grid, the energy storage and conversion system can be regarded as a current source, energy required by compensation is provided for the compensation transformer system in a mode of injecting current into the power grid, compensation for problems of reactive power, harmonic wave, three-phase imbalance and the like of the line is completed in the discharging process, when the voltage amplitude of the power transmission line does not need compensation in a normal range, the energy storage and conversion system can be regarded as a load for storing the energy of the power grid, load peak-valley regulation is realized, and compensation for problems of reactive power, harmonic wave, three-phase;
the input end of the sensing and control unit 3 is a three-phase line input end, and the output end is connected with the compensation transformer system and the energy storage and energy conversion system, and is used for detecting and analyzing voltage and current information of the power transmission and analysis circuit, determining the working mode of the system and outputting related control instructions to the two subsystems.
The system structure diagram shown in fig. 1 is a schematic diagram of a left-connected system structure, and the system suitable for power supply radius extension in a load sparse region includes two topologies according to a specific connection relationship between a compensation transformer system 1 and an energy storage and energy conversion system 2: a left connecting structure and a right connecting structure. Wherein, the structural diagram of the right-connected system is shown in fig. 2.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
the compensation transformer system 1 adopts a left power-taking type system structure, and as shown in fig. 3, includes a power-taking unit 11, a compensation transformer 12, an ac voltage-regulating converter 13, and a voltage-regulating control unit 14; the power taking unit 11 adopts an isolation transformer, a primary side winding of the isolation transformer is an input end of the power taking unit and is connected in parallel between a three-phase line and a neutral line, and a secondary side winding of the isolation transformer is an output end of the power taking unit and is connected with the alternating current voltage regulating converter 13 for obtaining energy (including voltage and current) required by a voltage compensation process, and the matching of the voltage grade of a power grid and the voltage grade of the alternating current voltage regulating converter is realized through the isolation transformer; the secondary side winding of the compensation transformer 12 is connected in series in the power supply line, and the primary side winding is connected with the output end of the alternating current side of the alternating current voltage regulating converter 13 and is used for coupling the compensation voltage output by the alternating current voltage regulating converter 13 into the power supply line so as to realize line voltage regulation; the AC voltage regulating converter 13 adopts a bidirectional thyristor AC voltage regulating circuit, and the control mode comprises the following steps: on-off control, phase control and chopping control, wherein an input end on an alternating current side is connected with an output end of the power taking unit 11, an output end on the alternating current side is connected with a primary side winding of the compensating transformer 12, and the alternating current side is used for carrying out power conversion according to a control signal output by the voltage regulating control unit 14, generating required compensating voltage when a circuit needs voltage compensation and outputting the required compensating voltage to the primary side winding of the compensating transformer, so that the corresponding voltage compensation of the circuit is realized; the output end of the voltage regulation control unit 14 is connected with the alternating current voltage regulation converter 13, the input end receives the control signal output by the sensing and control unit, and determines the working state of the compensation transformer system according to the control signal, namely when the line needs voltage compensation, a corresponding device on-off control signal is generated and output to the alternating current voltage regulation converter to control the alternating current voltage regulation converter to generate corresponding compensation voltage, and when the line does not need voltage compensation, the corresponding device is controlled to be turned off, and no compensation voltage is generated.
The compensation transformer system 1 also adopts a right-side power-taking system structure, as shown in fig. 4. The structure of the compensation transformer system 1 adopting a left power-taking type compensation transformer system or a right power-taking type compensation transformer system is determined by the specific connection relationship between the compensation transformer system 1 and the energy storage and energy conversion system 2.
The ac voltage regulating converter 13 adopts any circuit topology capable of realizing ac voltage regulating function in the prior art, such as a frequency converter (used for voltage regulation only), an ac voltage regulator, and the like.
As shown in fig. 5, the energy storage and conversion system 2 includes: the AC/DC bidirectional converter 21 adopts a three-phase bridge PWM (pulse width modulation) rectifying circuit topology, the AC side is connected in parallel between a three-phase line and a neutral line of a power transmission line through the reactor 25 and is used for realizing bidirectional flow of energy between the energy storage and energy conversion system and the power transmission line (power grid), when the energy storage and energy conversion system is in a discharging mode, the AC/DC bidirectional converter 21 works in an inverter state and can be regarded as a current source to provide current required by compensation for a compensating transformer system and realize compensation for problems of reactive power, harmonic waves, three-phase imbalance and the like of the line in the discharging process, when the energy storage and energy conversion system is in a charging mode, the AC/DC bidirectional converter 21 works in a rectifier state, the current fed back by a power grid is absorbed, and meanwhile, the compensation of the problems of line reactive power, harmonic waves, three-phase imbalance and the like is realized in the charging process; the DC/DC BOOST converter 22 is in a bidirectional BUCK-BOOST circuit topology, the high-voltage direct current side is connected with a direct-current side port of the AC/DC bidirectional converter 21, the low-voltage direct current side is connected with an output end of the energy storage battery and a management system 23 thereof, and direct current output by the energy storage battery and direct current obtained by rectification of a power grid are subjected to bidirectional conversion; the output port of the energy storage battery and its management system 23 is connected to the low-voltage DC side of the DC/DC boost converter 22, and when operating in the discharging mode, provides an energy source for the whole system, and when operating in the charging mode, absorbs and stores the energy fed back by the grid; the output end of the power conversion control unit 24 is connected with the AC/DC bidirectional converter 21, the DC/DC boost converter 22, the energy storage battery and the management system 23 thereof, the input end of the power conversion control unit receives the control signal output by the sensing and control unit, determines the working state of the energy storage and energy conversion system according to the control signal, generates a corresponding device on-off control signal and outputs the corresponding device on-off control signal to the three sub-modules, and controls the three sub-modules to complete corresponding power conversion in the charging or discharging working mode.
The AC/DC bidirectional converter 21 may be any other AC-DC conversion circuit topology having bidirectional energy flow characteristics in the prior art, and may be configured to perform bidirectional AC-DC conversion.
The DC/DC boost converter 22 may be any DC-DC conversion circuit topology having a bidirectional energy flow characteristic in the prior art, and may be configured to perform bidirectional DC-DC conversion.
The sensing and control unit 3, as shown in fig. 6, includes: the system comprises a power grid voltage and current data acquisition unit 31, a power flow analysis module 32, a working mode decision module 33, a compensation transformer system working mode decision output module 34 and an energy storage and conversion system working mode decision output module 35; the input end of the power grid voltage and current data acquisition unit 31 is connected with a power grid, and acquires voltage and current data information of the power grid in real time and outputs the data information to the power flow analysis module 32; the input end of the power flow analysis module 32 is connected to the output end of the grid voltage and current data acquisition unit 31, and the obtained voltage and current data information in the power transmission line (power grid) is analyzed to obtain the amplitude and phase thereof, and after solving the information of the compensation voltage amplitude, current amplitude, three-phase imbalance, harmonic wave, line power factor and the like required by the current line, the information is output to the working mode decision module 33; the input end of the working mode decision module 33 is connected with the output end of the power flow analysis module, and the module determines the overall working mode of the system according to the analysis and calculation result of the power flow analysis module 32, and respectively outputs the working mode and the corresponding control instruction to the working mode decision output module 34 of the compensation transformer system and the working mode decision output module 35 of the energy storage and energy conversion system; the compensation transformer system working mode decision output module 34 is connected with the output end of the working mode decision module 33, receives the control instruction output by the working mode decision module, outputs the required compensation voltage amplitude as a setting signal to the voltage regulation control unit 14 in the compensation transformer system, and provides a given voltage regulation signal for the voltage regulation control unit; the energy storage and energy conversion system working mode decision output module 35 is connected with the output end of the working mode decision module 33, receives the control instruction output by the working mode decision output module, and outputs the current amplitude value to be compensated as a setting signal to the power conversion control unit 24 of the energy storage and energy conversion system for control. In this embodiment, the grid voltage and current data acquisition unit adopts a Shenzhen Jiansi research JSY-MK-141 series sampling module, which can accurately acquire parameters such as alternating voltage, current, power factor, frequency and electric quantity of a power line, and can also adopt other sampling modules in the prior art to acquire and output phase voltage data. In this embodiment, the power flow analysis module, the working mode decision module, the compensation transformer system working mode decision output module, and the energy storage and conversion system working mode decision output module are implemented by an existing controller module, for example: program modules are compiled in embedded processors such as a DSP (digital signal processor), a singlechip and the like, but the program modules are all relatively simple program segments. The specific principle of the mode discrimination is shown in fig. 7, and the specific process comprises the following three steps:
the method comprises the following steps: judging whether the voltage needs to be compensated or not according to the voltage information, if not, not compensating by the compensation transformer system, enabling the energy storage and energy conversion system to enter a charging mode, receiving and storing feedback energy of the power grid; if compensation is needed, entering the step two for judgment;
step two: estimating load information according to the voltage and the current, judging whether the power grid is in a peak time period, if the power grid is not in the peak time period, namely the load is in a load range which can be independently compensated by the compensation transformer system, independently performing voltage compensation by the compensation transformer system, and providing the required compensation current by the power grid; if the power grid is in the peak time period, entering the third step for judgment;
step three: judging whether the electric energy stored in the energy storage and energy conversion system is enough to meet the current required by the compensation transformer system or not according to the electric quantity storage information of the energy storage system and the information of the required compensation current, and if the electric energy meets the compensation current required by the voltage compensation of the compensation transformer system, independently providing the current required by the compensation by the energy storage and energy conversion system; if the compensation current required by the voltage compensation of the compensation transformer system is not met, the energy storage and energy conversion system and the power grid together provide the current required by the compensation, the current output by the energy storage and energy conversion system is preferentially used, and the insufficient current is provided by the power grid.
The utility model discloses a system that is fit for sparse area power supply radius of load and extends not only can realize the regulation of peak valley load round clock through energy storage and energy conversion system, still can regard as the electric current source to supply with the compensating transformer system when load peak period circuit terminal voltage seriously falls, realizes terminal voltage's promotion under the condition that does not cause extra line loss as far as possible, effectively extends the power supply service radius. Meanwhile, the compensation of the problems of power grid harmonic waves, three-phase imbalance, power factors and the like can be realized in the process of charging and discharging of the energy storage system. Because the current required by compensation is not taken from the power grid as far as possible, the problems that the voltage drop at the tail end is more serious due to the failure of a series compensation device and the like can not be caused, and the method has important significance for solving the power supply problems of serious voltage drop, large line loss and the like in western regions.
Therefore, the purpose of the utility model is completely and effectively realized. 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 present invention includes all modifications based on the spirit and scope of the claims.
Claims (6)
1. A system suitable for power supply radius extension in a load sparse area comprises a three-phase line, a neutral line, a compensating transformer system (1), an energy storage and conversion system (2) and a sensing and control unit (3),
the input end of the compensation transformer system (1) comprises a three-phase line input end and a neutral line input end, and the output end comprises a three-phase line output end and a neutral line output end;
the input end of the energy storage and conversion system (2) comprises a three-phase line input end and a neutral line input end, and the output end comprises a three-phase line output end and a neutral line output end;
the input end of the sensing and control unit (3) comprises a three-phase line input end, and the output end of the sensing and control unit is connected with the compensation transformer system (1) and the energy storage and conversion system (2);
the specific connection relationship between the compensation transformer system (1) and the energy storage and conversion system (2) comprises two topologies: a left connection structure and a right connection structure, wherein the left connection structure is that the energy storage and conversion system (2) is close to the input end of the three-phase line and the input end of the neutral line, the compensation transformer system (1) is close to the three-phase line output end and the neutral line output end, namely, the energy storage and conversion system (2) is connected to the output end of a three-phase line and the output end of a neutral line after passing through the compensating transformer system (1), wherein, the right connection structure is that the compensating transformer system (1) is close to the input end of the three-phase line and the input end of the neutral line, the energy storage and conversion system (2) is close to the three-phase line output end and the neutral line output end, namely, the compensating transformer system (1) is connected to the three-phase line output end and the neutral line output end after passing through the energy storage and conversion system (2).
2. The system for adapting to the extension of the power supply radius in the sparse load area according to claim 1, wherein: the compensation transformer system (1) comprises a power taking unit (11), a compensation transformer (12), an alternating current voltage regulating converter (13) and a voltage regulating control unit (14), wherein the input end of the power taking unit (11) is connected with the output end of the energy storage and energy conversion system (2) and is connected between a three-phase line and a neutral line in parallel, and the output end of the power taking unit is connected with the alternating current voltage regulating converter (13); the secondary side winding of the compensation transformer (12) is connected in series in a power supply line, and the primary side winding is connected with the output end of the alternating current side of the alternating current voltage regulating converter (13); the input end of the alternating current side of the alternating current voltage regulating converter (13) is connected with the output end of the power taking unit (11), the output end of the alternating current side is connected with the primary side winding of the compensating transformer (12), the output end of the voltage regulating control unit (14) is connected with the alternating current voltage regulating converter (13), and the input end of the voltage regulating converter is connected with the output end of the sensing and control unit (3).
3. The system for adapting to the extension of the power supply radius in the sparse load area according to claim 1, wherein: the energy storage and conversion system (2) comprises an AC/DC bidirectional converter (21), a DC/DC boost converter (22), an energy storage battery and management system (23) thereof, a power conversion control unit (24) and a reactor (25), wherein the alternating current side of the AC/DC bidirectional converter (21) is connected between a three-phase line and a neutral line of a power transmission line in parallel through the reactor (25); the high-voltage direct current side of the DC/DC boost converter (22) is connected with the direct current side port of the AC/DC bidirectional converter (21), and the low-voltage direct current side is connected with the output end of the AC/DC bidirectional converter (21); the output port of the energy storage battery and the management system (23) thereof is connected with the low-voltage direct current side of the DC/DC boost converter (22); the output end of the power conversion control unit (24) is connected with the AC/DC bidirectional converter (21), the DC/DC boost converter (22), the energy storage battery and a management system (23) thereof, and the input end of the power conversion control unit is connected with the output end of the sensing and control unit (3).
4. The system for adapting to the extension of the power supply radius in the sparse load area according to claim 1, wherein: the sensing and control unit (3) comprises a power grid voltage and current data acquisition unit (31), a power flow analysis module (32), a working mode decision module (33), a compensation transformer system working mode decision output module (34) and an energy storage and conversion system working mode decision output module (35), wherein the input end of the power grid voltage and current data acquisition unit (31) is connected with a power grid; the input end of the power flow analysis module (32) is connected with the output end of the power grid voltage and current data acquisition unit (31); the input end of the working mode decision module (33) is connected with the output end of the power flow analysis module (32); the input end of the compensation transformer system working mode decision output module (34) is connected with the output end of the working mode decision module (33), and the output end of the compensation transformer system is connected with the compensation transformer system (1); the input end of the working mode decision output module (35) of the energy storage and energy conversion system is connected with the output end of the working mode decision module (33), and the output end of the working mode decision output module is connected with the energy storage and energy conversion system (2).
5. The system for adapting to the extension of the power supply radius in the sparse load area according to claim 2, wherein: the electricity taking unit (11) in the compensation transformer system (1) adopts an isolation transformer, a primary side winding of the isolation transformer is an input end of the electricity taking unit and is connected between a three-phase line and a neutral line in parallel, and a secondary side winding of the isolation transformer is an output end of the electricity taking unit and is connected with the alternating current voltage regulating converter (13); or the electricity taking unit (11) directly connects the alternating current voltage regulating converter (13) to a position between the three-phase line and the neutral line through a lead without adopting an isolation transformer.
6. The system for adapting to the extension of the power supply radius in the sparse load area according to claim 2, wherein: the specific connection relation between the electricity taking unit (11) and the compensating transformer (12) in the compensating transformer system (1) has two topologies: the left power-taking type compensation transformer system structure and the right power-taking type compensation transformer system structure are characterized in that the power-taking unit (11) of the left power-taking type compensation transformer system structure is located at the front end of the compensation transformer (12), namely the power-taking unit (11) is close to a three-phase line input end and a neutral line input end, and the compensation transformer (12) of the right power-taking type compensation transformer system structure is located at the front end of the power-taking unit (11), namely the compensation transformer (12) is close to the three-phase line input end and the neutral line input end; the compensation transformer system (1) adopts a left power-taking type compensation transformer system structure or a right power-taking type compensation transformer system structure, which is determined by the specific connection relationship between the compensation transformer system (1) and the energy storage and energy conversion system (2), and specifically comprises the following steps:
when the system adopts a left connection type structure, the compensation transformer system adopts a left power-taking type compensation transformer system structure;
when the system adopts a right connection type structure, the compensation transformer system adopts a right power taking type compensation transformer system structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021312814.6U CN213367416U (en) | 2020-07-07 | 2020-07-07 | System suitable for power supply radius extension in load sparse region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021312814.6U CN213367416U (en) | 2020-07-07 | 2020-07-07 | System suitable for power supply radius extension in load sparse region |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213367416U true CN213367416U (en) | 2021-06-04 |
Family
ID=76138914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021312814.6U Active CN213367416U (en) | 2020-07-07 | 2020-07-07 | System suitable for power supply radius extension in load sparse region |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213367416U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769568A (en) * | 2020-07-07 | 2020-10-13 | 上海大学 | System and method suitable for realizing power supply radius extension in load sparse region |
-
2020
- 2020-07-07 CN CN202021312814.6U patent/CN213367416U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769568A (en) * | 2020-07-07 | 2020-10-13 | 上海大学 | System and method suitable for realizing power supply radius extension in load sparse region |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106849343B (en) | The independently-powered switching system of communication base station wind-solar-diesel storage and power switching method | |
| RU181029U1 (en) | Electronic battery simulator for testing power supply systems | |
| US10230242B2 (en) | Maximizing energy savings by utilizing conservation voltage reduction with adaptive voltage control and peak demand reduction at point of use | |
| CN111668850B (en) | Line electric energy compensation system based on energy storage and alternating current voltage regulation control | |
| CN109066822A (en) | A kind of multi-point dispersion formula distribution system dispatching method based on electric power electric transformer | |
| CN110289621A (en) | A kind of alternating current-direct current electric energy router of the access containing distributed generation resource | |
| CN104333036B (en) | Multi-source coordination control system | |
| CN113328512A (en) | Power supply system | |
| Nasir et al. | Solar photovoltaic integrated building scale hybrid AC/DC microgrid | |
| CN104682443A (en) | Photovoltaic power generation function based V2G system | |
| CN213367416U (en) | System suitable for power supply radius extension in load sparse region | |
| CN213367415U (en) | Three-in-one power electronic compensation transformer substation | |
| CN117691672B (en) | Wind power generation energy storage inverter circuit | |
| CN111668848B (en) | Current-voltage compensation system combining compensation transformer and energy storage module | |
| CN111756045A (en) | Three-in-one power electronic compensation transformer substation | |
| CN111769568A (en) | System and method suitable for realizing power supply radius extension in load sparse region | |
| CN203218892U (en) | Photovoltaic auxiliary grid-connected power generation controller and power generation system using same | |
| CN114825406A (en) | Grid-connected and off-grid type high-power bidirectional converter device | |
| WO2022166287A1 (en) | Electrical control box and power supply system | |
| CN114784785A (en) | Energy storage and high-voltage direct-current coupling power supply and control system for data center | |
| CN212588095U (en) | Power compensation power transformation system applied to power transmission | |
| CN111769625B (en) | Complementary power supply device based on solar energy and wind energy power generation and control method thereof | |
| CN212572173U (en) | Complementary power supply unit based on solar energy and wind energy electricity generation | |
| CN114465240A (en) | Active power consumption method for multi-source grid connection | |
| CN203951366U (en) | A kind of power supply for power information acquisition terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |