CN116073439A - Distributed multi-source power generation system and method adopting synchronous motor interface - Google Patents
Distributed multi-source power generation system and method adopting synchronous motor interface Download PDFInfo
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- 238000013016 damping Methods 0.000 description 2
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The invention discloses a distributed multi-source power generation system and a method adopting a synchronous motor interface, wherein the distributed multi-source power generation system comprises a synchronous motor interface, a converter, a micro-grid and a distributed wind-light-water storage power generation field, wherein the distributed wind-light-water storage power generation field is respectively connected with the micro-grid, the micro-grid is integrated into a power grid through the synchronous motor interface, the synchronous motor interface comprises a plurality of motor pairs which are arranged in parallel, the motor pairs comprise a motor and a generator which are coaxially connected with each other through rotors, and a power end of the motor is used as an input end of the synchronous motor interface and an output end of the generator is used as an output end of the synchronous motor interface; the method comprises a design and control method corresponding to the distributed multi-source power generation system. The invention can enhance the new energy consumption capability of the power system and improve the running stability and safety of various power systems with high new energy ratio.
Description
Technical Field
The invention belongs to the technical field of grid connection of new energy grids, and particularly relates to a distributed multi-source power generation system and method adopting a synchronous motor interface.
Background
New energy power generation is a strategic emerging industry, and in recent years, the large-scale development of new energy power generation has become a high point for preempting a new round of global energy transformation and economic and technological competition. Compared with the traditional thermal power generation, the new energy power generation has the remarkable advantages of cleanness, regeneration and the like, but the new energy mainly comprising photovoltaic and wind power is connected to a power grid and mainly depends on a power electronic converter, so that the trend of 'high-proportion renewable energy' and 'high-proportion power electronic equipment' is formed. The high level of power electronics of the power system exposes some "shortfalls" in the generation of new energy. With the continuous improvement of the grid-connected permeability of the new energy, the problems of system operation stability reduction and the like caused by the large-scale grid connection of the new energy due to the replacement of the synchronous machine must be solved. In order to overcome the defects and improve the grid connection stability of new energy, a scheme of new energy power generation and alternating current collection and interface grid connection by adopting a motor is adopted, and meanwhile, a certain proportion of distributed energy storage is configured in the system. The multisource new energy power generation system is assembled in the AC micro-grid after current transformation, the electric energy is assembled and then is driven by the back-to-back converter to drive the coaxial generator to generate electric energy to be transmitted to the external power grid, wherein the motor interface is formed by connecting a plurality of groups of pairs of motors in parallel, and the motor and the generator are respectively provided with an independent excitation system, so that the output reactive power can be independently regulated. In the proposed system, the motor pair provides mechanical inertia, the energy storage system provides active power response, and the frequency stability of grid connection is improved. Meanwhile, by coordinating the active/reactive power output of the new energy power station and the output of the energy storage system, the voltage of key nodes (power generation field nodes and grid connection points) of the system can be effectively controlled. At present, various power control strategies of an electric power system, such as proportional-integral control, fuzzy control and the like, are widely adopted by modern wind farms due to simple implementation, but have poor control effect on units farther from a collector wire. In a great deal of research, a control strategy based on Optimal Power Flow (OPF) is proposed, the voltage reference of a lead bus is determined through offline optimal power flow calculation, and a PI controller is used to obtain a total reactive power reference, and then the total reactive power reference is distributed to each wind generating set to obtain an optimal control effect, but the terminal voltage of each set on a feed line cannot be considered, so that some fans are stopped due to voltage runaway. In recent years, model predictive control has become a popular control method in the industry, and is widely applied to power optimization distribution of an electric power system.
Disclosure of Invention
The invention aims to solve the technical problems: aiming at the problems in the prior art, the invention provides a distributed multi-source power generation system and a method adopting a synchronous motor interface, which can enhance the new energy consumption capability of a power system, improve the operation stability and safety of various power systems with high new energy duty ratio, and generate important scientific significance and application value for the technical development of the new energy power generation grid connection field and the safe operation of a power grid.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an adopt synchronous machine interface's distributed multisource power generation system, includes synchronous machine interface, converter, little electric wire netting and distributed wind-solar water storage generating field, distributed wind-solar water storage generating field links to each other with little electric wire netting respectively, just little electric wire netting merges the electric wire netting through synchronous machine interface, synchronous machine interface includes the many motor pair group of draging of parallelly connected arrangement, motor pair group includes rotor coaxial coupling's motor and generator, the power end of motor is as synchronous machine interface's input the output of generator is as synchronous machine interface.
Optionally, the motor pair towing set further comprises a first circuit breaker for controlling the working state of the motor pair towing set.
Optionally, the synchronous motor interface is further connected with a second circuit breaker for controlling the grid-connected state, and the synchronous motor interface is integrated into the power grid through the second circuit breaker.
Optionally, the converter is a dual PWM back-to-back converter.
Optionally, the micro-grid is an alternating current micro-grid, the distributed wind-light-water storage power plant comprises a photovoltaic power generation unit, a wind power unit, a water power unit, a pumped storage unit and an electrochemical energy storage unit, the photovoltaic power generation unit and the electrochemical energy storage unit are respectively connected with the micro-grid through a DC/AC converter, and the wind power unit, the water power unit and the pumped storage unit are respectively connected with the micro-grid through converters.
The invention also provides a design method of the distributed multi-source power generation system adopting the synchronous motor interface, which comprises the following steps:
s101, respectively determining the generated energy of a photovoltaic power generation unit, a wind power unit and a hydropower unit;
s102, determining the power sum of a hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit, and selecting the types of the pumped storage unit and the electrochemical energy storage unit;
s103, determining the power output by the micro-grid to the synchronous motor interface according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit and the capacities of the pumped storage unit and the electrochemical energy storage unit;
s104, selecting the synchronous motor interface according to the determined information and constructing a distributed multi-source power generation system adopting the synchronous motor interface.
Optionally, the function expression for determining the capacities of the pumped-storage unit and the electrochemical energy storage unit in step S102 is:
wherein ,
for both pumped-storage units and electrochemical energy-storage unitstThe sum of the charge power and the discharge power at the moment, the charge power is positive number, and the discharge power is negative number; />
In an electrochemical energy storage unittCharging and discharging power at moment, wherein the charging power is positive number, and the discharging power is negative number; />
Is that a micro-grid is arranged on a pumped storage unittInput and output power at moment, wherein the input power is a negative number, and the output power is a negative number; determining the capacity of the synchronous motor interface in step S103 includes determining a functional expression of the power output by the micro-grid to the synchronous motor interface as:
in the above-mentioned method, the step of,
for the power output by the microgrid to the synchronous machine interface, < >>
Generating capacity of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit; />
The power sum of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit is positive, the charging power is negative, and the discharging power is negative; />
The output power of the photovoltaic power generation unit; />
The output power of the wind power unit; />
Is the output power of the hydroelectric unit; in step S104, when the synchronous motor interface is selected according to the determined information, the capacity of the synchronous motor interface is +.>
The method meets the following conditions:
in the above-mentioned method, the step of,
is the rated capacity of the wind power unit, < >>
Is the rated capacity of the photovoltaic power unit, +.>
Is the rated capacity of the hydroelectric unit, < >>
Is the rated capacity of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit, and is +.>
, wherein />
Is the maximum discharge capacity of the electrochemical energy storage cell, +.>
Is the maximum discharge capacity of the pumped storage unit.
The invention also provides a control method of the distributed multi-source power generation system adopting the synchronous motor interface, which comprises the following steps:
s201, the receiving and dispatching department gives out the reference power output of each distributed power generation field
And calculates the current active power loss +.>
System sensitivity +.>
；
S202, outputting the reference power
Current active power loss->
System sensitivity +.>
Inputting the reference active power to be output in the distributed wind-light-water-storage power generation place by the centralized central controller MPC>
And reference reactive power->
And reference voltage of synchronous motor interface +.>
。
Alternatively, power is lost in step S201
The expression of the calculation function of (c) is:
in the above-mentioned method, the step of,
is a loose bus node set, wherein the loose bus node is a node at the interface of the synchronous motor>
Is a set of nodes of a distributed power supply, +.>
Is node->
Output power, +.>
Is node->
Voltage of>
Is node->
Line resistance between; calculating the sensitivity of the system in step S201>
The method includes the steps of establishing a system sensitivity model shown in the following formula:
in the above-mentioned method, the step of,
and />
Respectively->
Point and->
Active power loss of point injection +.>
，/>
Is->
Point voltage, < >>
Is node->
Admittance therebetween; />
Is->
Point voltage, < >>
，/>
Obtaining any +.>
Point active power injection for +.>
Point voltage->
Sensitivity to changes->
And optionally->
Point reactive power injection for->
Point voltage
Sensitivity to changes->
。
Optionally, in step S202, the central controller MPC calculates a reference active power to be output in the distributed wind-solar-water-storage power generation place
And reference reactive power->
And reference voltage of synchronous motor interface +.>
Comprising the following steps:
s301, taking the active/reactive power output of a distributed wind-solar-water storage power generation field and the output of a hybrid energy storage system formed by a pumped storage unit and an electrochemical energy storage unit as control variables, taking time scale, node voltage limit, power generation and new energy non-load shedding control as constraint conditions, taking minimum voltage deviation of key nodes, network loss minimization and economical operation as optimization targets, and establishing the optimization problem of multi-target multi-parameter coupling of a distributed multi-source power generation system;
s302, solving the optimization problem of multi-objective multi-parameter coupling of the distributed multi-source power generation system according to the cost function and the constraint condition thereof in the current working mode to obtain the reference active power to be output in the distributed wind-light water storage power generation place
And reference reactive power->
And reference voltage of synchronous motor interface +.>
An optimal control sequence is formed.
Compared with the prior art, the invention has the following advantages: the distributed multi-source power generation system adopting the synchronous motor interface not only keeps good inertial response, damping characteristic and excitation control of the generator, but also protects a new energy electric field from being influenced by power grid faults through the isolation function of the mechanical shaft, improves the frequency and voltage stability of new energy grid connection, can effectively realize stable operation of the power grid, reduces system grid loss and effectively controls grid connection point voltage by coordinating the power output of the new energy power station and the output of the energy storage system, can enhance the new energy consumption capability of the power system, improves the operation stability and safety of various high-new energy-ratio power systems, and has important scientific significance and application value for technical development in the new energy power generation grid connection field and safe operation of the power grid.
Drawings
Fig. 1 is a schematic structural diagram of a distributed multi-source power generation system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a synchronous motor interface 1 according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a design method according to an embodiment of the present invention.
Fig. 4 is a basic flow chart of a control method according to an embodiment of the invention.
Legend description: 1. a synchronous motor interface; 11. a motor; 12. a generator; 13. a first circuit breaker; 14. a second circuit breaker; 2. a current transformer; 3. a micro grid; 4. distributed wind-light-water power generation field.
Detailed Description
As shown in fig. 1, the distributed multi-source power generation system adopting the synchronous motor interface in the embodiment comprises a synchronous motor interface 1, a converter 2, a micro-grid 3 and a distributed wind-light-water storage power generation field 4, wherein the distributed wind-light-water storage power generation field 4 is respectively connected with the micro-grid 3, and the micro-grid 3 is integrated into a power grid through the synchronous motor interface 1. As shown in fig. 2, the synchronous motor interface 1 comprises a plurality of motor pair-packs arranged in parallel, the motor pair-packs comprise a motor 11 and a generator 12, the rotors of which are coaxially connected, a power supply end of the motor 11 is used as an input end of the synchronous motor interface 1, and an output end of the generator 12 is used as an output end of the synchronous motor interface 1. The electric energy generated by the distributed wind-light-water storage power generation field 4 is collected in the micro-grid 3 and is combined into an external power grid through a plurality of groups of motors 11 and generators 12 which are connected in parallel and coaxially, so that a grid connection mode of a power electronic converter is replaced, the wind-light-water storage multi-source power generation system is directly connected with the power grid through a synchronous motor interface 1, the traditional power electronic converter is replaced by the synchronous motor interface 1 based on the towing of a plurality of motors, multi-source new energy power generation grid connection is realized, and the high-efficiency energy storage control technology is utilized to participate in power grid voltage and frequency adjustment, so that grid connection stability is improved.
As shown in fig. 2, the motor-pair-towing set further comprises a first circuit breaker 13 for controlling the operating state of the motor-pair-towing set.
As shown in fig. 1, the synchronous motor interface 1 is further connected with a second circuit breaker 14 for controlling the grid-connected state, and the synchronous motor interface 1 is integrated into the power grid through the second circuit breaker 14.
As shown in fig. 1, in this embodiment, the converter 2 is a dual PWM back-to-back converter, and other types of converters may be adopted as required, and similar functions may be implemented.
The distributed wind-solar-water-storage power generation field 4 can comprise a multi-source new energy field group and a multi-type energy storage system, electric energy of the distributed new energy source and the energy storage system is collected to the micro-grid 3, a motor 11 is driven by a double PWM back-to-back converter (converter 2), and a generator 12 is driven by a common rotating shaft to be connected. As shown in fig. 1, in this embodiment, the micro-grid 3 is an AC micro-grid, the distributed wind-light-water-storage power plant 4 includes a photovoltaic power generation unit, a wind power unit, a hydropower unit, a pumped storage unit, and an electrochemical energy storage unit, where the photovoltaic power generation unit and the electrochemical energy storage unit are connected with the micro-grid 3 through DC/AC converters, and the wind power unit, the hydropower unit, and the pumped storage unit are connected with the micro-grid 3 through converters, respectively.
In summary, the main topology system of the distributed multi-source power generation system adopting the synchronous motor interface according to the present embodiment includes: the system comprises a plurality of distributed new energy power stations (wind power generation, photovoltaic power generation), a plurality of energy storage systems (pumped storage, electrochemical energy storage and the like), a plurality of sets of converter equipment (double PWM back-to-back converters, inverters) and a set of motor interface system, wherein the motor interface is formed by connecting a plurality of groups of motor pairs which are towed in pairs in parallel. The system operation mode is: the multisource new energy power generation system is converged in the AC micro-grid after current transformation, and the electric energy is converged and then is driven by the back-to-back converter to drive the coaxial generator to generate electric energy to be transmitted to an external power grid. According to the distributed multi-source power generation system adopting the synchronous motor interface, good inertial response, damping characteristics and excitation control of the power generator are reserved, a new energy electric field is protected from being influenced by power grid faults through the isolation function of a mechanical shaft, the frequency and voltage stability of new energy grid connection are improved, stable operation of a power grid can be effectively realized, the power output of a new energy power station and the output of an energy storage system are coordinated, the grid loss of the system is reduced, the voltage of a grid connection point is effectively controlled, the new energy consumption capability of the power system can be enhanced, the operation stability and safety of various high-new energy-ratio power systems are improved, and important scientific significance and application value are generated for technical development in the new energy power generation grid connection field and safe operation of the power grid.
As shown in fig. 3, the present embodiment further provides a method for designing the aforementioned distributed multi-source power generation system using a synchronous motor interface, including:
s101, respectively determining the generated energy of a photovoltaic power generation unit, a wind power unit and a hydropower unit;
s102, determining the power sum of a hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit, and selecting the types of the pumped storage unit and the electrochemical energy storage unit;
s103, determining the power output by the micro-grid 3 to the synchronous motor interface 1 according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit and the capacities of the pumped storage unit and the electrochemical energy storage unit;
s104, selecting the synchronous motor interface 1 according to the determined information and constructing a distributed multi-source power generation system adopting the synchronous motor interface.
In step S102 of this embodiment, the function expression for determining the capacity of the pumped-storage unit and the electrochemical energy storage unit is:
wherein ,
for both pumped-storage units and electrochemical energy-storage unitstThe sum of the charge power and the discharge power at the moment, the charge power is positive number, and the discharge power is negative number; />
In an electrochemical energy storage unittCharging and discharging power at moment, wherein the charging power is positive number, and the discharging power is negative number; />
Is a micro-grid 3-way pumped storage unittInput and output power at moment, wherein the input power is a negative number, and the output power is a negative number; determining the capacity of the synchronous motor interface 1 in step S103 includes determining a functional expression of the power output by the micro grid 3 to the synchronous motor interface 1 as:
in the above-mentioned method, the step of,
for the power output by the micro-grid 3 to the synchronous machine interface 1,/-for>
Generating capacity of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit; />
The power sum of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit is positive, the charging power is negative, and the discharging power is negative; />
The output power of the photovoltaic power generation unit; />
The output power of the wind power unit; />
Is the output power of the hydroelectric unit; in step S104, when the synchronous motor interface 1 is selected according to the determined information, the capacity of the synchronous motor interface 1 is +.>
The method meets the following conditions:
in the above-mentioned method, the step of,
is the rated capacity of the wind power unit, < >>
Is the rated capacity of the photovoltaic power unit, +.>
Is the rated capacity of the hydroelectric unit, < >>
Is the rated capacity of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit, and is +.>
, wherein />
Is the maximum discharge capacity of the electrochemical energy storage cell, +.>
Is the maximum discharge capacity of the pumped storage unit.
In order to improve the energy efficiency and stability of a distributed multi-source power generation system adopting a synchronous motor interface. As shown in fig. 4, the present embodiment further provides a control method of a distributed multi-source power generation system using a synchronous motor interface, including:
s201, the receiving and dispatching department gives out the reference power output of each distributed power generation field
And calculates the current active power loss +.>
System sensitivity +.>
；
S202, outputting the reference power
Current active power loss->
System sensitivity +.>
The reference active power (I) required to be output by the distributed wind, light and water storage power generation field 4 is calculated by the centralized central controller MPC>
And reference reactive power->
SynchronizationReference voltage of motor interface 1 ∈>
。
In this embodiment, the power loss in step S201
The expression of the calculation function of (c) is:
in the above-mentioned method, the step of,
is a loose bus node set, wherein the loose bus node is a node at the synchronous motor interface 1, and the loose bus node is a node of the synchronous motor interface 1>
Is a set of nodes of a distributed power supply, +.>
Is node->
Output power, +.>
Is node->
Voltage of>
Is node->
Line resistance between; calculating the sensitivity of the system in step S201>
The method includes the steps of establishing a system sensitivity model shown in the following formula:
in the above-mentioned method, the step of,
and />
Respectively->
Point and->
Active power loss of point injection +.>
，/>
Is->
Point voltage, < >>
Is node->
Admittance therebetween; />
Is->
Point voltage, < >>
，/>
Obtaining any +.>
Point active power injection for +.>
Point voltage->
Sensitivity to changes->
And optionally->
Point reactive power injection for->
Point voltage
Sensitivity to changes->
。
In this embodiment, the central controller MPC in step S202 calculates the reference active power required to be output by the distributed wind-solar-water-storage power generation field 4
And reference reactive power->
And the reference voltage of the synchronous machine interface 1 +.>
Comprising the following steps:
s301, taking the output of a hybrid energy storage system formed by active/reactive power output of a distributed wind-light-water storage power generation field 4, a pumped storage unit and an electrochemical energy storage unit as control variables, taking time scale, node voltage limit, power generation and new energy non-load shedding control as constraint conditions, taking minimum voltage deviation of key nodes, network loss minimization and economical operation as optimization targets, and establishing the optimization problem of multi-target multi-parameter coupling of a distributed multi-source power generation system;
s302, according to the current working modeSolving the optimization problem of multi-objective multi-parameter coupling of the distributed multi-source power generation system under the cost function and constraint conditions thereof to obtain the reference active power required to be output by the distributed wind-light water storage power generation field 4
And reference reactive power->
And the reference voltage of the synchronous machine interface 1 +.>
Optimal control sequence of componentsu(k)。
The main control objective of the optimization problem of the multi-objective multi-parameter coupling of the distributed multi-source power generation system in this embodiment is to minimize the power loss (network loss minimization) in the ac microgrid, and keep the grid-connected point voltage within a safe range (minimum voltage deviation of the key nodes) while tracking the scheduling command. In this embodiment, the expression of the system discrete state space model adopted by the optimization problem of the multi-objective multi-parameter coupling of the established distributed multi-source power generation system is:
in the above-mentioned method, the step of,
is the firstkSystem state matrix and control matrix for +1 iterations, +.>
and />
Respectively the firstkA system state matrix and a control matrix for a second iteration, < >>
and />
Respectively including sampling time->
Is used for the coefficient matrix of (a),k=1,2,…,N p ，N p the total prediction step number of the prediction interval is the total prediction step number; wherein the system state matrix->
The method comprises the following steps:
wherein the control matrix
The method comprises the following steps:
in the above-mentioned method, the step of,
and />
The voltage measurement and reference value increases at the synchronous machine interface,
the system comprises a wind power unit, a photovoltaic power generation unit, a hydroelectric unit and a hybrid energy storage system, wherein the hybrid energy storage system consists of the water energy storage unit and an electrochemical energy storage unit, and the wind power unit, the photovoltaic power generation unit, the hydroelectric unit and the hybrid energy storage system respectively output the increment value of active power>
The increment value of reactive power output by the wind power unit, the photovoltaic power unit and the hydro-electric unit is +.>
Active power parameters of a wind power unit, a photovoltaic power generation unit, a hydro-electric unit and a hybrid energy storage system respectivelyIncrement of the test value->
The increment values of reactive power output by the wind power unit, the photovoltaic power generation unit and the hydro-electric unit are respectively. The objective function of the optimization problem of the multi-objective multi-parameter coupling of the established distributed multi-source power generation system is as follows:
in the above-mentioned method, the step of,
for the power loss minimization expression +.>
Is->
Weight of->
Deviation of the voltage of each fan terminal of the electric field from the reference value, < >>
Is->
Is a weight of (a). Wherein (1)>
and />
The expression of the calculation function of (c) is:
in the above-mentioned method, the step of,
for the total number of prediction steps of the prediction interval, +.>
Representing any one ofkActive power loss at time
,/>
The voltage deviation of the grid-connected point is:
in the above-mentioned method, the step of,
for the current terminal voltage value of the grid-connected point, +.>
For grid-connected point voltage, ">
and />
Active/reactive power for distributed farm output, +.>
and />
Is thatkThe fan output active/reactive power increment at moment,/->
A reference value is designed for the voltage. It should be noted that, according to the cost function and the constraint condition thereof in the current working mode, the optimization problem of multi-objective multi-parameter coupling of the distributed multi-source power generation system is solved into the existing method, and in this embodiment, the method is only involvedAnd the application of this method, the details of which are not described in detail herein. Finally, through the control method, the optimization targets of minimum voltage deviation of key nodes, minimum network loss and economical operation can be achieved, and the energy efficiency and stability of the distributed multi-source power generation system adopting the synchronous motor interface can be effectively improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (10)
1. The utility model provides an adopt synchronous machine interface's distributed multisource power generation system, its characterized in that includes synchronous machine interface (1), converter (2), little electric wire netting (3) and distributed wind-solar water storage power generation field (4), distributed wind-solar water storage power generation field (4) link to each other with little electric wire netting (3) respectively, just little electric wire netting (3) merge the electric wire netting through synchronous machine interface (1), synchronous machine interface (1) are to dragging the group including many motors of parallelly connected arrangement, motor is to dragging the group and is included rotor coaxial coupling's motor (11) and generator (12), the power end of motor (11) is as synchronous machine interface (1)'s input the output of generator (12) is as synchronous machine interface (1).
2. A distributed multi-source power generation system employing synchronous motor interfaces according to claim 1, wherein the motor pair-pack further comprises a first circuit breaker (13) for controlling the operating state of the motor pair-pack.
3. A distributed multi-source power generation system employing a synchronous motor interface according to claim 2, wherein the synchronous motor interface (1) is further connected with a second circuit breaker (14) for controlling the grid-connected state, and the synchronous motor interface (1) is integrated into the power grid through the second circuit breaker (14).
4. A distributed multi-source power generation system employing synchronous motor interfaces according to claim 3, characterized in that the converter (2) is a dual PWM back-to-back converter.
5. The distributed multi-source power generation system adopting the synchronous motor interface according to any one of claims 1 to 4, wherein the micro-grid (3) is an alternating-current micro-grid, the distributed wind-light-water power storage and generation field (4) comprises a photovoltaic power generation unit, a wind power unit, a water power unit, a pumped storage unit and an electrochemical energy storage unit, the photovoltaic power generation unit and the electrochemical energy storage unit are respectively connected with the micro-grid (3) through a DC/AC converter, and the wind power unit, the water power unit and the pumped storage unit are respectively connected with the micro-grid (3) through converters.
6. A method of designing a distributed multi-source power generation system employing a synchronous motor interface as set forth in claim 5, comprising:
s101, respectively determining the generated energy of a photovoltaic power generation unit, a wind power unit and a hydropower unit;
s102, determining the power sum of a hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit, and selecting the types of the pumped storage unit and the electrochemical energy storage unit;
s103, determining the power output by the micro-grid (3) to the synchronous motor interface (1) according to the generated energy of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit and the capacities of the pumped storage unit and the electrochemical energy storage unit;
s104, selecting the synchronous motor interface (1) according to the determined information and constructing a distributed multi-source power generation system adopting the synchronous motor interface.
7. The method of designing a distributed multi-source power generation system using synchronous motor interfaces as claimed in claim 6, wherein the function expression for determining the capacities of the pumped-storage unit and the electrochemical energy storage unit in step S102 is:
wherein ,
for both pumped-storage units and electrochemical energy-storage unitstThe sum of the charge power and the discharge power at the moment, the charge power is positive number, and the discharge power is negative number; />
In an electrochemical energy storage unittCharging and discharging power at moment, wherein the charging power is positive number, and the discharging power is negative number; />
Is arranged in a micro-grid (3) to a pumped storage unittInput and output power at moment, wherein the input power is a negative number, and the output power is a negative number; determining the capacity of the synchronous motor interface (1) in step S103 includes determining a functional expression of the power output by the micro-grid (3) to the synchronous motor interface (1) as:
in the above-mentioned method, the step of,
for the power output by the microgrid (3) to the synchronous machine interface (1), the power is +.>
Generating capacity of the photovoltaic power generation unit, the wind power unit and the hydroelectric unit; />
The power sum of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit is positive, the charging power is negative, and the discharging power is negative; />
The output power of the photovoltaic power generation unit; />
The output power of the wind power unit; />
Is the output power of the hydroelectric unit; in step S104, when the synchronous motor interface (1) is selected according to the determined information, the capacity of the synchronous motor interface (1) is +.>
The method meets the following conditions:
in the above-mentioned method, the step of,
is the rated capacity of the wind power unit, < >>
Is the rated capacity of the photovoltaic power unit, +.>
Is the rated capacity of the hydroelectric unit, < >>
Is the rated capacity of the hybrid energy storage system formed by the pumped storage unit and the electrochemical energy storage unit, and is +.>
, wherein />
Is the maximum discharge capacity of the electrochemical energy storage cell, +.>
Is the maximum discharge capacity of the pumped storage unit.
8. A control method of a distributed multi-source power generation system employing a synchronous motor interface as set forth in claim 5, comprising:
s201, the receiving and dispatching department gives out the reference power output of each distributed power generation field
And calculates the current active power loss +.>
System sensitivity +.>
；
S202, outputting the reference power
Current active power loss->
System sensitivity +.>
Inputting the reference active power (I) required to be output by the distributed wind-light-water storage power generation field (4) through the calculation of the centralized central controller (MPC)>
And reference reactive power->
And the reference voltage of the synchronous machine interface (1)>
。
9. The method for controlling a distributed multi-source power generation system using a synchronous motor interface as claimed in claim 8, wherein the power loss is in step S201
The expression of the calculation function of (c) is:
in the above-mentioned method, the step of,
is a loose bus node set, and the loose bus node is a node at the synchronous motor interface (1), and is ∈>
Is a set of nodes of a distributed power supply, +.>
Is node->
Output power, +.>
Is node->
Voltage of>
Is node->
Line resistance between; calculating the sensitivity of the system in step S201>
The method includes the steps of establishing a system sensitivity model shown in the following formula:
in the above-mentioned method, the step of,
and />
Respectively->
Point and->
Active power loss of point injection +.>
，/>
Is->
Point voltage, < >>
Is node->
Admittance therebetween; />
Is->
Point voltage, < >>
，/>
Obtaining any +.>
Point active power injection for +.>
Point voltage->
Sensitivity to changes->
And optionally->
Point reactive power injection for->
Point voltage->
Sensitivity to changes->
。
10. The method for controlling a distributed multi-source power generation system using a synchronous motor interface according to claim 8, wherein the central controller MPC calculates the reference active power required to be output by the distributed wind-solar-water-storage power generation field (4) in step S202
And reference reactive power->
And the reference voltage of the synchronous machine interface (1)>
Comprising the following steps:
s301, taking the output of a hybrid energy storage system formed by active/reactive power output of a distributed wind-solar-water storage power generation field (4) and a pumped storage unit and an electrochemical energy storage unit as control variables, taking time scale, node voltage limit, power generation and new energy non-load shedding control as constraint conditions, taking minimum voltage deviation of key nodes, network loss minimization and economical operation as optimization targets, and establishing the optimization problem of multi-target multi-parameter coupling of a distributed multi-source power generation system;
s302, solving the optimization problem of multi-objective multi-parameter coupling of the distributed multi-source power generation system according to the cost function and the constraint condition thereof in the current working mode to obtain the reference active power required to be output by the distributed wind-solar-water-storage power generation field (4)
And reference reactive power->
And the reference voltage of the synchronous machine interface (1)>
An optimal control sequence is formed. />
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