CN112217233A - Scheduling method and system of wave energy power generation device - Google Patents
Scheduling method and system of wave energy power generation device Download PDFInfo
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Abstract
The invention provides a scheduling method and a scheduling system for a wave energy power generation device, wherein the method adopts a nonlinear programming algorithm and comprises the following steps: in the simulation stage, a marine intermittent energy power grid simulation model is established, and the feasibility of a scheduling operation strategy is verified; in the debugging stage, a manual scheduling control mode is adopted to obtain historical power data of the wave energy power generation device, inverter grid-connected power of the wave energy power generation device is set according to a manual scheduling control instruction, correction information is obtained, and the inverter grid-connected power is corrected according to the correction information; and in the operation stage, an automatic scheduling control mode is adopted, real-time data of the wave energy power generation device is obtained, multi-stage judgment is carried out according to a preset instruction to calculate the grid-connected power of the inverter, and the grid-connected power of the inverter is automatically controlled by automatically issuing an inverter grid-connected instruction through the island microgrid power scheduling system. The invention can enable the wave energy power generation device to be stably connected to and output from the island micro-grid, realizes adjustability and controllability, and is beneficial to the large-scale connection of the wave energy power generation device to the island micro-grid.
Description
Technical Field
The invention relates to the technical field of power dispatching, in particular to a dispatching method and a dispatching system of a wave energy power generation device.
Background
Wave energy is extremely unstable due to the reciprocating nature and irregularities of the waves. The hydraulic energy storage type wave energy power generation device aims at the special requirements of island micro-grids, although a two-stage energy storage link, hydraulic energy storage and battery energy storage are arranged, incoming wave energy absorbed by the wave energy power generation device is converged into the micro-grid after the two-stage energy storage, decoupling of inverter grid-connected power and incoming wave power can be achieved, stability and controllability of power output of the wave energy power generation device can be improved, but stability of the micro-grid and utilization efficiency of stored energy in the device are directly influenced by a grid-connected operation scheduling control strategy of the wave energy power generation device. The Chinese patent with the application number of CN201110445844.3 discloses a multipurpose controllable and schedulable energy storage system and a method thereof, wherein the energy storage system comprises a wave energy conversion device, a main controller in the energy storage system can only carry out output control according to initial setting, only generates electricity according to external electricity utilization requirements in a grid-connected electricity generation stage, and does not schedule a grid-connected operation stage of a power generation device; the chinese patent with application number CN201810442658.6 discloses an island energy comprehensive energy management method, which combines historical record analysis and timely makes a corresponding optimized scheduling scheme by an optimization algorithm to guide load calling, power generation scheduling and energy storage control according to the operating power output condition of power generation equipment, but does not provide a specific scheduling strategy for different phases of grid-connected operation of a wave energy power generation device, so that in the prior art, the research on the grid-connected operation scheduling control strategy of the energy storage type wave energy power generation device is very little, and the problem is urgently needed to be solved.
Disclosure of Invention
The invention aims to provide a scheduling method and a scheduling system of a wave energy power generation device, which aim to overcome or at least partially solve the problems in the prior art.
The invention provides a scheduling method of a wave energy power generation device, which adopts a nonlinear programming algorithm and specifically comprises the following steps:
in the simulation stage, a marine intermittent energy power grid simulation model is established, and the feasibility of a scheduling operation strategy is verified;
in the debugging stage, a manual scheduling control mode is adopted to obtain historical power data of the wave energy power generation device, inverter grid-connected power of the wave energy power generation device is set according to a manual scheduling control instruction, correction information is obtained, and the inverter grid-connected power is corrected according to the correction information, wherein the correction information comprises the charge state of a storage battery, the change trend of a micro-grid load and weather forecast;
and in the operation stage, an automatic scheduling control mode is adopted, real-time data of the wave energy power generation device is obtained, multi-stage judgment is carried out according to a preset instruction, inverter grid-connected power is calculated, the inverter grid-connected instruction is automatically issued through the island microgrid power scheduling system, the inverter grid-connected power is automatically controlled, and the real-time data comprise the power generation power of the wave energy power generation device, the charge state of a storage battery and the power consumption of a user.
Further, the acquiring of real-time data of the wave energy power generation device and the multistage judgment and calculation of the inverter grid-connected power according to the preset instruction specifically include:
when the average generated power is not greater than the grid-connected power within the judgment time period, sequentially judging whether the voltage of the storage battery is less than the lower limit protection voltage of the storage battery and whether the grid-connected power is greater than the grid-connected power regulation step length;
when the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length, setting the grid-connected power of the inverter as P (k) ═ P (k-1) -Pstep;
when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not greater than the grid-connected power regulation step length, the grid-connected power of the inverter is set to be P (k) ═ P (k-1), wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
Further, the acquiring of real-time data of the wave energy power generation device and the multistage judgment and calculation of the inverter grid-connected power according to the preset instruction specifically include:
when the average power generation power is larger than the grid-connected power within the judgment time period, sequentially judging whether the voltage of the storage battery is larger than the upper limit protection voltage of the storage battery, whether the grid-connected power is smaller than the maximum output power of the inverter and whether the grid-connected power is smaller than 10% of the load of the microgrid;
when the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, the grid-connected power is less than the maximum output power of the inverter and the grid-connected power is less than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1) + Pstep;
when the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1), wherein P (k) < k > is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected.
A second aspect of the present invention provides a scheduling system for a wave energy power generation apparatus, the system comprising:
the feasibility verification module is used for establishing an offshore intermittent energy power grid simulation model and verifying the feasibility of a scheduling operation strategy;
the manual scheduling module is used for acquiring historical power data of the wave energy power generation device in a debugging stage, setting inverter grid-connected power of the wave energy power generation device according to a manual scheduling control instruction, acquiring correction information, and correcting the inverter grid-connected power according to the correction information, wherein the correction information comprises storage battery charge state, micro-grid load variation trend and weather forecast;
the automatic control module is used for acquiring real-time data of the wave energy power generation device in an operation stage, automatically issuing an inverter grid-connected instruction through the island microgrid power dispatching system and automatically controlling the inverter grid-connected power, wherein the real-time data comprise the wave energy power generation power, the charge state of a storage battery and the power consumption of a user.
Further, the automatic control module specifically includes:
the first judgment submodule is used for sequentially judging whether the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and whether the grid-connected power is larger than the grid-connected power regulation step length when the average power generation power is not larger than the grid-connected power within the judgment time period;
the first power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) -Pstep when the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length;
and the second power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not more than the grid-connected power regulation step length, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
Further, the automatic control module specifically further includes:
the second judgment submodule is used for sequentially judging whether the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, whether the grid-connected power is less than the maximum output power of the inverter and whether the grid-connected power is less than 10% of the load of the microgrid when the average power generation power is greater than the grid-connected power within the judgment time period;
the third power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) + Pstep when the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, the grid-connected power is less than the maximum output power of the inverter and the grid-connected power is less than 10% of the load of the microgrid;
and the fourth power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) when the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power adjusting step.
Compared with the prior art, the invention has the beneficial effects that:
according to the scheduling method and system of the wave energy power generation device, provided by the invention, in a debugging stage, the wave energy power generation device can be ensured to safely operate in a manual scheduling mode by acquiring historical power data of the wave energy power generation device and setting the grid-connected power of an inverter of the wave energy power generation device according to a manual scheduling control instruction; in the operation stage, after real-time data of the wave energy power generation device is acquired, an inverter grid-connected instruction is automatically issued through the island micro-grid power dispatching system, the grid-connected power of the inverter is automatically controlled, manual intervention is not needed, and the consumption of renewable energy is improved, so that the wave energy power generation device is stably connected to and output from the island micro-grid, and adjustability and controllability are realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic overall flow chart of a scheduling method of a wave energy power generation device according to an embodiment of the present invention.
Fig. 2 is a graph of real-time power generation and grid-connected power within 1 hour according to an embodiment of the present invention.
Fig. 3 is a voltage diagram of a battery according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to illustrate the invention and not to limit the scope of the invention.
An embodiment of the present invention provides a method for scheduling a wave energy power generation apparatus, including the steps of:
and in the simulation stage, establishing an offshore intermittent energy power grid simulation model and verifying the feasibility of a scheduling operation strategy.
And in the debugging stage, acquiring historical power data of the wave energy power generation device by adopting a manual scheduling control mode, setting inverter grid-connected power of the wave energy power generation device according to a manual scheduling control instruction, acquiring correction information, and correcting the inverter grid-connected power according to the correction information, wherein the correction information comprises the charge state of a storage battery, the change trend of a micro-grid load and weather forecast.
And in the operation stage, an automatic scheduling control mode is adopted to obtain real-time data of the wave energy power generation device, the real-time data is subjected to multi-stage judgment according to a preset instruction to calculate the inverter grid-connected power, the inverter grid-connected instruction is automatically issued through the island microgrid power scheduling system to automatically control the inverter grid-connected power, and the real-time data comprises the wave energy power generation device power generation power, the storage battery charge state and the user power consumption power.
In this embodiment, the wave energy power generation device is an energy storage type wave energy power generation device, and the working principle thereof mainly includes: the wave energy floater absorbs incoming wave energy, drives the hydraulic cylinder to do work, converts the incoming wave energy into hydraulic energy and stores the hydraulic energy in the energy accumulator. When the energy is fully stored, the energy is converted into electric energy through the hydraulic generator set, and the electric energy is charged into the storage battery after being rectified. The energy of the storage battery is fed into the power grid through the inverter. When the incoming wave energy is small, the hydraulic generator set works in a 0-1 power generation mode, and when the incoming wave energy is large, the hydraulic generator set continuously generates power. The energy storage type wave energy power generation device executes control instructions and is provided with a wave energy power generation device grid-connected inverter which is an energy storage inverter and has bidirectional power transmission power, and the working mode of the energy storage type wave energy power generation device mainly comprises the following steps:
an off-grid voltage source mode;
a direct current voltage source mode;
constant ac power charge/discharge mode;
constant direct current charge/discharge mode.
When the wave energy power generation device is operated in a grid-connected mode, the inverter works in a constant alternating current power charging/discharging mode or a constant direct current charging/discharging mode, and the grid-connected power scheduling is realized by remotely setting alternating current power or direct current.
The wave energy power generation device grid-connected project relates to a plurality of contents such as ocean platform arrangement, submarine cable construction, new energy grid connection and the like, most of the wave energy power generation device grid-connected project works on the sea, and is greatly influenced by weather, and the working period is long. The wave energy power generation device grid-connected project can be divided into a plurality of stages such as device putting, power transmission landing, networking debugging and the like. According to different operation stages, the scheduling method of the wave energy power generation device adopts a manual scheduling mode and an automatic scheduling mode. After the device is put in and the power transmission landing construction is finished, namely, the device can be put into grid-connected operation during the joint debugging joint test, and at the moment, a manual scheduling mode is adopted. After the wave energy power generation device grid-connected inverter and the island microgrid dispatching system finish communication and debugging, the wave energy power generation device dispatching control strategy can adopt an automatic dispatching mode.
In the debugging stage, although the island microgrid power dispatching system does not complete communication debugging with the wave energy device inverter, the power access primary system is completed, and wave power grid-connected access can be completely realized. In addition, power grid access is also required during maintenance of the communication system. At the moment, the scheduling of the grid-connected power of the wave energy power generation device can be set through the local inverter and the wireless data transmission station of the device, and the grid-connected output power of the inverter can be set by adopting a manual judgment scheduling mode according to the real-time power generation average power curve of the wave energy power generation device.
The grid-connected power regulation step length is inevitably too large in the manual dispatching mode, after the debugging stage is finished, the wave energy power generation device adopts an automatic dispatching control strategy in the normal operation stage, an inverter grid-connected instruction is automatically issued by the island micro-grid power dispatching system, the grid-connected power of the inverter is automatically controlled according to the real-time data of the wave energy power generation device, manual intervention is not needed, and therefore the real-time consumption of renewable energy is improved.
Referring to fig. 1, as a preferred example, the acquiring real-time data of the wave energy power generation device, and performing multi-stage judgment on the real-time data according to a preset instruction to calculate the inverter grid-connected power specifically includes:
and when the average generated power is not greater than the grid-connected power within the judgment time period, sequentially judging whether the voltage of the storage battery is less than the lower limit protection voltage Udown of the storage battery and whether the grid-connected power is greater than the grid-connected power regulation step length. In some embodiments, the time period may take 10 minutes.
When the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length, the grid-connected power of the inverter is set to be P (k) -P (k-1) -Pstep, the storage battery is insufficient, and the grid-connected power is reduced on the premise of preventing reverse power flow of the inverter.
And when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not greater than the grid-connected power regulation step length, setting the grid-connected power of the inverter to be P (k) ═ P (k-1), thereby increasing the grid-connected power. Wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
In addition, when the average power generation power is larger than the grid-connected power within the judgment time period, whether the voltage of the storage battery is larger than the upper limit protection voltage of the storage battery, whether the grid-connected power is smaller than the maximum output power of the inverter and whether the grid-connected power is smaller than 10% of the load of the microgrid are sequentially judged.
When the voltage of the storage battery is larger than the upper limit protection voltage of the storage battery, the grid-connected power is smaller than the maximum output power of the inverter, and the grid-connected power is smaller than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1) + Pstep.
When the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1), wherein P (k) < k > is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, Pstep is the grid-connected power adjusting step length, and Pset is. In some embodiments, in the automatic scheduling control mode, the adjustment step length may be set by a user, the default value is 1kW, and the refresh time is defaulted to 1 minute, or may be set manually.
When the method provided by the embodiment is applied to a sea-state grid-connected power generation experiment carried out on an offshore island, the wave power generation device generates power and grid-connected power in real time within 1 hour, the voltage change curve of the storage battery is shown in fig. 2, and the data sampling period is 1 second.
From the experimental data of fig. 2 and fig. 3, it can be seen that in the 1-hour period, the real-time power generation curve of the wave energy power generation device fluctuates in the range of 60kW to 160kW, but the grid-connected power is always kept constant at 85 kW. Although the voltage of the storage battery fluctuates due to the change of the generated power, the voltage of the storage battery fluctuates basically around 505V in the 1 hour time period, which indicates that the charge state of the storage battery does not change greatly, and indicates that the grid-connected power of the wave energy power generation device is basically equal to the average generated power. Experimental data show that the scheduling method of the energy storage type wave energy power generation device provided by the embodiment can realize that grid-connected power is not affected by real-time power generation power, and the grid-connected power is stably output according to average power generation power, so that the wave energy power generation device becomes an adjustable and controllable power generation unit and can be successfully connected to a fragile microgrid of a remote island reef.
Based on the same inventive concept, another embodiment of the present invention further provides a scheduling system for wave energy power generation devices, the system comprising:
and the feasibility verification module is used for establishing an offshore intermittent energy power grid simulation model and verifying the feasibility of a scheduling operation strategy.
And the manual scheduling module is used for acquiring historical power data of the wave energy power generation device in a debugging stage, setting inverter grid-connected power of the wave energy power generation device according to a manual scheduling control instruction, acquiring correction information, and correcting the inverter grid-connected power according to the correction information, wherein the correction information comprises the charge state of the storage battery, the change trend of the micro-grid load and weather forecast.
The automatic control module is used for acquiring real-time data of the wave energy power generation device in an operation stage, performing multi-stage judgment and calculation on inverter grid-connected power according to a preset instruction, automatically issuing the inverter grid-connected instruction through the island microgrid power dispatching system, and automatically controlling the inverter grid-connected power, wherein the real-time data comprise the power generation power of the wave energy power generation device, the charge state of a storage battery and the power consumption of a user.
Optionally, the automatic control module specifically includes:
the first judgment submodule is used for sequentially judging whether the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and whether the grid-connected power is larger than the grid-connected power regulation step length when the average power generation power is not larger than the grid-connected power within the judgment time period;
the first power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) -Pstep when the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length;
and the second power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not more than the grid-connected power regulation step length, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
Optionally, the automatic control module further includes:
the second judgment submodule is used for sequentially judging whether the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, whether the grid-connected power is less than the maximum output power of the inverter and whether the grid-connected power is less than 10% of the load of the microgrid when the average power generation power is greater than the grid-connected power within the judgment time period;
the third power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) + Pstep when the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, the grid-connected power is less than the maximum output power of the inverter and the grid-connected power is less than 10% of the load of the microgrid;
and the fourth power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) when the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power adjusting step.
The above system embodiment is used to implement the foregoing method embodiment, and the working principle and technical effect thereof can refer to the foregoing method embodiment, which is not described herein again.
Those skilled in the art will appreciate that the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more special integrated circuits, or one or more microprocessors, or one or more field programmable gate arrays, or the like. For another example, when some of the above modules are implemented in the form of processing element dispatcher code, the processing element may be a general purpose processor, such as a central processing unit or other processor that can invoke the program code. For another example, the modules may be integrated together and implemented in a system on a chip.
In the embodiments provided in the present invention, it should be understood that the disclosed system and method can be implemented in other ways. For example, the above-described system embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A scheduling method for a wave energy power generation device is characterized in that the method adopts a nonlinear programming algorithm, and specifically comprises the following steps:
in the simulation stage, a marine intermittent energy power grid simulation model is established, and the feasibility of a scheduling operation strategy is verified;
in the debugging stage, a manual scheduling control mode is adopted to obtain historical power data of the wave energy power generation device, inverter grid-connected power of the wave energy power generation device is set according to a manual scheduling control instruction, correction information is obtained, and the inverter grid-connected power is corrected according to the correction information, wherein the correction information comprises the charge state of a storage battery, the change trend of a micro-grid load and weather forecast;
and in the operation stage, an automatic scheduling control mode is adopted, real-time data of the wave energy power generation device is obtained, multi-stage judgment is carried out according to a preset instruction, inverter grid-connected power is calculated, the inverter grid-connected instruction is automatically issued through the island microgrid power scheduling system, the inverter grid-connected power is automatically controlled, and the real-time data comprise the power generation power of the wave energy power generation device, the charge state of a storage battery and the power consumption of a user.
2. The scheduling method of the wave energy power generation device according to claim 1, wherein the acquiring of real-time data of the wave energy power generation device and the multistage judgment and calculation of the inverter grid-connected power according to a preset instruction specifically comprise:
when the average generated power is not greater than the grid-connected power within the judgment time period, sequentially judging whether the voltage of the storage battery is less than the lower limit protection voltage of the storage battery and whether the grid-connected power is greater than the grid-connected power regulation step length;
when the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length, setting the grid-connected power of the inverter as P (k) ═ P (k-1) -Pstep;
when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not greater than the grid-connected power regulation step length, the grid-connected power of the inverter is set to be P (k) ═ P (k-1), wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
3. The scheduling method of the wave energy power generation device according to claim 1, wherein the acquiring of real-time data of the wave energy power generation device and the multistage judgment and calculation of the inverter grid-connected power according to a preset instruction further comprises:
when the average power generation power is larger than the grid-connected power within the judgment time period, sequentially judging whether the voltage of the storage battery is larger than the upper limit protection voltage of the storage battery, whether the grid-connected power is smaller than the maximum output power of the inverter and whether the grid-connected power is smaller than 10% of the load of the microgrid;
when the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, the grid-connected power is less than the maximum output power of the inverter and the grid-connected power is less than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1) + Pstep;
when the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, the grid-connected power of the inverter is set to be P (k) ═ P (k-1), wherein P (k) < k > is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected.
4. A scheduling system for a wave energy power generation device, the system comprising:
the feasibility verification module is used for establishing an offshore intermittent energy power grid simulation model and verifying the feasibility of a scheduling operation strategy;
the manual scheduling module is used for acquiring historical power data of the wave energy power generation device in a debugging stage, setting inverter grid-connected power of the wave energy power generation device according to a manual scheduling control instruction, acquiring correction information, and correcting the inverter grid-connected power according to the correction information, wherein the correction information comprises storage battery charge state, micro-grid load variation trend and weather forecast;
the automatic control module is used for acquiring real-time data of the wave energy power generation device in an operation stage, performing multi-stage judgment and calculation on inverter grid-connected power according to a preset instruction, automatically issuing the inverter grid-connected instruction through the island microgrid power dispatching system, and automatically controlling the inverter grid-connected power, wherein the real-time data comprise the power generation power of the wave energy power generation device, the charge state of a storage battery and the power consumption of a user.
5. The scheduling system of wave energy power generation facility of claim 4, characterized in that the automatic control module specifically includes:
the first judgment submodule is used for sequentially judging whether the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and whether the grid-connected power is larger than the grid-connected power regulation step length when the average power generation power is not larger than the grid-connected power within the judgment time period;
the first power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) -Pstep when the voltage of the storage battery is smaller than the lower limit protection voltage of the storage battery and the grid-connected power is larger than the grid-connected power regulation step length;
and the second power setting submodule is used for setting the grid-connected power of the inverter to be P (k) -P (k-1) when the voltage of the storage battery is not less than the lower limit protection voltage of the storage battery or the grid-connected power is not more than the grid-connected power regulation step length, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power regulation step length.
6. The scheduling system of wave energy power generation facility of claim 4, characterized in that the automatic control module further comprises:
the second judgment submodule is used for sequentially judging whether the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, whether the grid-connected power is less than the maximum output power of the inverter and whether the grid-connected power is less than 10% of the load of the microgrid when the average power generation power is greater than the grid-connected power within the judgment time period;
the third power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) + Pstep when the voltage of the storage battery is greater than the upper limit protection voltage of the storage battery, the grid-connected power is less than the maximum output power of the inverter and the grid-connected power is less than 10% of the load of the microgrid;
and the fourth power setting submodule is used for setting the grid-connected power of the inverter to be P (k) ═ P (k-1) when the voltage of the storage battery is not greater than the upper limit protection voltage of the storage battery or the grid-connected power is not less than the maximum output power of the inverter or the grid-connected power is not less than 10% of the load of the microgrid, wherein P (k) is the grid-connected power of the inverter in the current period, P (k-1) is the grid-connected power of the inverter in the previous period, and Pstep is the grid-connected power adjusting step.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117477674A (en) * | 2023-12-27 | 2024-01-30 | 广东海洋大学 | Micro-grid dispatching method comprising wind power generation and wave energy generation |
| CN117559568A (en) * | 2024-01-12 | 2024-02-13 | 广东海洋大学 | Cascade micro-grid power distribution method based on wind power generation and wave energy generation |
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| CN111245018A (en) * | 2020-03-09 | 2020-06-05 | 特变电工西安电气科技有限公司 | Micro-grid-connected tie line power limit control method and device |
| CN111561416A (en) * | 2020-04-29 | 2020-08-21 | 国网山东省电力公司电力科学研究院 | Power grid-friendly wave energy power generation collecting system and operation control method thereof |
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| EP1959535A2 (en) * | 2007-02-19 | 2008-08-20 | HONDA MOTOR CO., Ltd. | Cogeneration system |
| CN111245018A (en) * | 2020-03-09 | 2020-06-05 | 特变电工西安电气科技有限公司 | Micro-grid-connected tie line power limit control method and device |
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| CN117477674B (en) * | 2023-12-27 | 2024-03-12 | 广东海洋大学 | Micro-grid dispatching method comprising wind power generation and wave energy generation |
| CN117559568A (en) * | 2024-01-12 | 2024-02-13 | 广东海洋大学 | Cascade micro-grid power distribution method based on wind power generation and wave energy generation |
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