CN110867897A - Coordination control strategy under multi-mode of multi-port energy router - Google Patents
Coordination control strategy under multi-mode of multi-port energy router Download PDFInfo
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- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Abstract
The invention discloses a multi-mode coordination control strategy of a multi-port energy router. The multiport energy router is a novel electric energy conversion device developed based on a topological structure of a power electronic transformer, and realizes the functions of conveying and absorbing new energy such as water, electricity and solar energy. The energy router has four connection ports in total, including a water-containing electric port, a photovoltaic port, an energy storage port and a grid connection port. The four ports operate in a coordinated mode, the upper-layer energy management system issues instructions to the ports by adopting a multi-mode coordination control strategy, the ports receive and execute the instructions, and the functions that the energy is transmitted to the energy router through the hydroelectric port and the photovoltaic port, the energy is output to the power grid through the grid-connected port, and the output power of the energy storage port maintains the system balance according to the power difference are achieved.
Description
Technical Field
The invention relates to the field of electric energy conversion, in particular to a coordination control strategy of a multi-port energy router under multiple modes.
Background
With the global shortage of fossil energy and the increasing environmental pollution, new energy power generation technology is increasingly promoted, and the global attention on new energy is gradually increased. The traditional thermal power generation mode has the characteristics of reliability and feasibility, and occupies a larger area in a power generation system. However, the thermal power generation mode has low electric energy conversion efficiency and large pollution degree to the environment. With the increase of the social attention to the sustainable development strategy and the environmental importance, the environment-friendly renewable energy gradually appears in the human vision. Compared with fossil energy such as coal, petroleum, natural gas and the like, renewable energy such as wind energy, solar energy and the like is cleaner, and the renewable energy has great reserve, so that the problem of insufficient energy of the society can be well relieved. With the continuous development of energy storage technology and new energy power generation technology, traditional single centralized power generation gradually starts to change to a distributed and centralized concurrent power generation mode, and a unidirectional flow mode of electric energy also gradually changes to a multidirectional flow mode. However, the new energy has the disadvantages of intermittence, randomness, geographical dispersion and the like, and when a single new energy is used for generating power and is merged into a power grid, the situations that the power consumption of a user side is increased and the transmission power of the accessed new energy is insufficient can occur; the situation that the power consumption of the user side is reduced, the electric energy transmitted by the power grid cannot be utilized, and the accessed new energy cannot realize the bidirectional flow of the energy can also occur. In order to solve the problems, the concept of an energy router is developed, and the energy router is used for realizing multi-port access of energy, bidirectional or multidirectional flow of energy, providing an alternating current/direct current interface, regulating voltage and the like. The topological structure of the energy router device is researched more at home and abroad, and certain research results are obtained.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a coordination control strategy under a multi-mode of a multi-port energy router in order to realize the efficient normal operation of the energy router.
A multi-port energy router coordinated control strategy under a multi-mode comprises the following steps:
step 1: state information determination
The multi-mode coordination control strategy provided by the invention aims at different modes, firstly, the current battery state is judged according to the SOC value of the energy storage battery, when the SOC value is more than 0.8, the battery is in a dischargeable and non-dischargeable state, when the SOC value is less than 0.2 time, the battery is in a chargeable and non-dischargeable state, and when the SOC value is between 0.2 and 0.8, the battery is in a chargeable and dischargeable state; secondly, whether the maximum output power of the photovoltaic port meets the requirement of an upper layer power instruction is judged.
Step 2: multi-modal control strategy
The control strategy under multiple modes of the energy router is specifically expressed as follows (a grid-connected port inverter always keeps a PQ control strategy):
the first mode is as follows: if the photovoltaic power generation system is kept in the maximum power tracking mode, the upper layer power instruction P still cannot be met1When the energy storage system is at the lower limit of discharge, the small hydropower station outputs power to meet the demand of a power instruction; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV；
Mode two: if the photovoltaic power generation system keeps the maximum powerTracking mode, output power greater than upper power command P1When the energy storage system is in the lower discharge limit, the energy storage unit is charged, and the output power of the small hydropower station maintains the system balance according to each power difference; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
Mode three: if the energy storage system is between the upper limit and the lower limit of charge and discharge, charge and discharge are allowed, at the moment, the photovoltaic power generation system is kept in the maximum power tracking mode, but cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
And a fourth mode: if the energy storage system is between the upper limit and the lower limit of charge and discharge, the charge and discharge behaviors are allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is greater than the upper layer power instruction P1The energy storage unit is charged at the moment, and the output power of the small hydropower station maintains the system balance according to each power difference value; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
A fifth mode: if the energy storage system is at the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode at the moment and still cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode and the maximum power outputGo out of PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
A sixth mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1If the hydropower port does not act at this time, the capacity of the distributed power generation system is excessive if the distributed power generation system works in the maximum power tracking state, but the energy storage system cannot be charged due to the cut-off state of the energy storage system; then the photovoltaic port is set to work in a constant power output mode at the moment, and the output power P1The energy storage and water and electricity ports are not actuated;
a seventh mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1The need of (c); in order to meet the maximum utilization rate of new energy, the photovoltaic power generation system is still kept in a maximum power tracking mode, and redundant energy is fed into a power grid through a water and electricity access port; at the moment, the photovoltaic port is set to keep the maximum power output mode, and the maximum power output P isPVThe hydroelectric port works in an inversion mode, energy is fed back at constant power, and the power input is P1-PPV。
And step 3: per port instruction execution
After the instruction is set and issued, the execution of the instruction is carried out by each port, and the control mode of each port is as follows: hydroelectric port three-phase bridge PWM rectifier: the method adopts direct-current side voltage outer ring + current inner ring control to control alternating-current input current and realize expected power transmission; grid-connected port three-phase inverter: executing an upper-level P, Q instruction, and realizing rated active and reactive power transmission by adopting PQ outer ring + current inner ring control to maintain the voltage stability of the three-phase power distribution network; photovoltaic DC/DC converter: obtaining a maximum power point through a maximum power algorithm, and then realizing rated power transmission by adopting power outer loop and current inner loop control; energy storage DC/DC converter: the system sets a current instruction reference value of the energy storage converter according to the voltage value of the direct current side and the SOC state of the energy storage battery, so that power cooperative output is realized, and the voltage stability of a direct current bus is maintained.
The beneficial effect of this application: 1. the multi-mode coordination control strategy of the multi-port energy router provided by the invention takes the change factors of the states of the hydroelectric power, the photovoltaic power and the energy storage battery under the actual working condition into consideration, divides different operation modes, adopts different control modes for each mode, and issues control instructions in a targeted manner.
2. When the control strategy is executed, the SOC state and the photovoltaic maximum output power of the current energy storage battery are judged, and the next instruction operation is carried out according to the judgment result, so that the obtained instruction can more accurately control the operation of each current port, and the response speed of the energy router is improved; according to the control strategy provided by the invention, the rechargeable system mode of the energy storage battery is judged in time, and the operating efficiency of the energy storage port is improved.
3. The multi-port energy router coordinated control strategy provided by the invention has universality, and is different from the applicability of the existing control strategy in a fixed condition. The invention is based on a multi-port energy router, and is mainly characterized in that multiple operating modes are considered, various modes are respectively controlled, and the invention is still established when the invention is suitable for energy routers with other topological structures.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a topology diagram of an energy router according to the present invention;
FIG. 2 is a schematic diagram of a control strategy of the present invention for sending a command downward.
Detailed Description
Aiming at the defects of the prior art, the invention provides a coordination control strategy under a multi-mode of a multi-port energy router in order to realize the efficient normal operation of the energy router.
A multi-port energy router coordinated control strategy under a multi-mode comprises the following steps:
step 1: state information determination
The multi-mode coordination control strategy provided by the invention aims at different modes, firstly, the current battery state is judged according to the SOC value of the energy storage battery, when the SOC value is more than 0.8, the battery is in a dischargeable and non-dischargeable state, when the SOC value is less than 0.2 time, the battery is in a chargeable and non-dischargeable state, and when the SOC value is between 0.2 and 0.8, the battery is in a chargeable and dischargeable state; secondly, judging whether the maximum output power of the photovoltaic port meets the requirement of an upper layer power instruction; setting control instructions for the photovoltaic port, the energy storage port and the hydropower port according to the judgment information; the coordinated control under the energy router multi-mode is listed in a tabular form (in the table, P)1For upper power commands, PPVFor output of power from the photovoltaic port, PsFor energy storage port output power, P for hydroelectric port output power, MPPT for photovoltaic maximum power tracking mode):
step 2: multi-modal control strategy
The control strategy under multiple modes of the energy router is specifically expressed as follows (a grid-connected port inverter always keeps a PQ control strategy):
the first mode is as follows: if the photovoltaic power generation system is kept in the maximum power tracking mode, the upper layer power instruction P still cannot be met1When the energy storage system is at the lower limit of discharge, the small hydropower station outputs power to meet the demand of a power instruction; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV；
Mode two: if the photovoltaic power generation system remains in the maximum power tracking mode,the output power is greater than the upper power instruction P1When the energy storage system is in the lower discharge limit, the energy storage unit is charged, and the output power of the small hydropower station maintains the system balance according to each power difference; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
Mode three: if the energy storage system is between the upper limit and the lower limit of charge and discharge, charge and discharge are allowed, at the moment, the photovoltaic power generation system is kept in the maximum power tracking mode, but cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
And a fourth mode: if the energy storage system is between the upper limit and the lower limit of charge and discharge, the charge and discharge behaviors are allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is greater than the upper layer power instruction P1The energy storage unit is charged at the moment, and the output power of the small hydropower station maintains the system balance according to each power difference value; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
A fifth mode: if the energy storage system is at the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode at the moment and still cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
A sixth mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1If the hydropower port does not act at this time, the capacity of the distributed power generation system is excessive if the distributed power generation system works in the maximum power tracking state, but the energy storage system cannot be charged due to the cut-off state of the energy storage system; then the photovoltaic port is set to work in a constant power output mode at the moment, and the output power P1The energy storage and water and electricity ports are not actuated;
a seventh mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1The need of (c); in order to meet the maximum utilization rate of new energy, the photovoltaic power generation system is still kept in a maximum power tracking mode, and redundant energy is fed into a power grid through a water and electricity access port; at the moment, the photovoltaic port is set to keep the maximum power output mode, and the maximum power output P isPVThe hydroelectric port works in an inversion mode, energy is fed back at constant power, and the power input is P1-PPV。
And step 3: per port instruction execution
As shown in fig. 1, the multi-port energy router includes four connection ports, namely a hydroelectric port, a photovoltaic port, an energy storage port and a grid connection port; a hydroelectric port adopts a three-phase bridge type PWM rectifier to connect hydroelectric energy input with a direct current bus, a photovoltaic port adopts a DC/DC converter to connect a photovoltaic array with the direct current bus, an energy storage port adopts a bidirectional DC/DC converter to connect an energy storage battery with the direct current bus, a grid-connected port adopts a three-phase bridge type PWM inverter circuit to connect the direct current bus with a power grid, and four ports share one direct current bus and run in parallel. As shown in fig. 2, after the instruction is set and issued, the execution of the instruction is performed by each port, and the control method of each port is as follows: hydroelectric port three-phase bridge PWM rectifier: the method adopts direct-current side voltage outer ring + current inner ring control to control alternating-current input current and realize expected power transmission; grid-connected port three-phase inverter: executing an upper-level P, Q instruction, and realizing rated active and reactive power transmission by adopting PQ outer ring + current inner ring control to maintain the voltage stability of the three-phase power distribution network; photovoltaic DC/DC converter: obtaining a maximum power point through a maximum power algorithm, and then realizing rated power transmission by adopting power outer loop and current inner loop control; energy storage DC/DC converter: the system sets a current instruction reference value of the energy storage converter according to the voltage value of the direct current side and the SOC state of the energy storage battery, so that power cooperative output is realized, and the voltage stability of a direct current bus is maintained.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (5)
1. A multi-port energy router coordinated control strategy under multiple modes is characterized in that: comprises the following steps:
step 1: judging state information;
step 2: a multi-modal control strategy;
and step 3: executing instructions of each port; after the instruction is set and issued, the execution of the instruction is carried out by each port.
2. The multi-modal coordination control strategy of the multi-port energy router according to claim 1, wherein the step 1 is implemented by the following steps: judging the current battery state according to the SOC value of the energy storage battery, wherein when the SOC value is more than 0.8, the battery is in a dischargeable and non-dischargeable state, when the SOC value is less than 0.2, the battery is in a chargeable and non-dischargeable state, and when the SOC value is between 0.2 and 0.8, the battery is in a chargeable and dischargeable state;
judging whether the maximum output power of the photovoltaic port meets the requirement of an upper layer power instruction; setting control instructions for the photovoltaic port, the energy storage port and the hydropower port according to the judgment information; the coordinated control under the energy router multi-mode is listed in a tabular form.
3. The multi-modal coordination control strategy of the multi-port energy router according to claim 1, wherein the specific implementation method of the step 2 is as follows: considering various running states of each port in an actual application scene, dividing seven modes, giving a coordination control strategy under the multimode, and issuing instructions to each port, wherein the seven modes and the control strategy are as follows:
the first mode is as follows: if the photovoltaic power generation system is kept in the maximum power tracking mode, the upper layer power instruction P still cannot be met1When the energy storage system is at the lower limit of discharge, the small hydropower station outputs power to meet the demand of a power instruction; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV；
Mode two: if the photovoltaic power generation system is kept in the maximum power tracking mode, the output power is greater than the upper layer power instruction P1When the energy storage system is in the lower discharge limit, the energy storage unit is charged, and the output power of the small hydropower station maintains the system balance according to each power difference; then the photovoltaic port is set to maintain MPPT mode at the moment, and the maximum power output P is obtainedPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
Modal three: if the energy storage system is between the upper limit and the lower limit of charge and discharge, charge and discharge are allowed, at the moment, the photovoltaic power generation system is kept in the maximum power tracking mode, but cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
And a fourth mode: if the energy storage system is between the upper limit and the lower limit of charge and discharge, the charge and discharge behaviors are allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is greater than the upper layer power instruction P1The energy storage unit is charged at the moment, and the output power of the small hydropower station maintains the system balance according to each power difference value; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power charging mode, and the charging power is PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is Ps+P1-PPV；
A fifth mode: if the energy storage system is at the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode at the moment and still cannot meet the upper layer power instruction P1The stored energy and the small hydropower output together to keep the system power instruction requirement; then the photovoltaic port is set to maintain the maximum power output mode, maximum power output PPVThe energy storage port keeps a constant power discharge mode, the discharge power PsThe hydroelectric port adopts a constant direct current bus voltage control mode, and the power output is P1-PPV-Ps；
A sixth mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1If the hydroelectric port does not act at this time, the distributed power generation system will work in the maximum power tracking state at this timeThe existing capacity is excessive, but the energy storage system is in a cut-off state, so that charging cannot be carried out; then the photovoltaic port is set to work in a constant power output mode at the moment, and the output power P1The energy storage and water and electricity ports are not actuated;
a seventh mode: if the energy storage system is in the upper charging limit and the charging behavior is not allowed, the photovoltaic power generation system is kept in the maximum power tracking mode, and the output power is larger than the upper layer power instruction P1The need of (c); in order to meet the maximum utilization rate of new energy, the photovoltaic power generation system is still kept in a maximum power tracking mode, and redundant energy is fed into a power grid through a water and electricity access port; at the moment, the photovoltaic port is set to keep the maximum power output mode, and the maximum power output P isPVThe hydroelectric port works in an inversion mode, energy is fed back at constant power, and the power input is P1-PPV。
4. The multi-modal coordination control strategy of the multi-port energy router according to claim 1, wherein the specific implementation method of step 3 is as follows: the multi-port energy router comprises four connection ports including a hydropower port, a photovoltaic port, an energy storage port and a grid connection port; a hydroelectric port adopts a three-phase bridge type PWM rectifier to connect hydroelectric energy input with a direct current bus, a photovoltaic port adopts a DC/DC converter to connect a photovoltaic array with the direct current bus, an energy storage port adopts a bidirectional DC/DC converter to connect an energy storage battery with the direct current bus, a grid-connected port adopts a three-phase bridge type PWM inverter circuit to connect the direct current bus with a power grid, and four ports share one direct current bus and run in parallel.
5. The multi-modal coordination control strategy of the multi-port energy router according to claim 3, wherein each port is controlled as follows: hydroelectric port three-phase bridge PWM rectifier: the method adopts direct-current side voltage outer ring + current inner ring control to control alternating-current input current and realize expected power transmission; grid-connected port three-phase inverter: executing an upper-level P, Q instruction, and realizing rated active and reactive power transmission by adopting PQ outer ring + current inner ring control to maintain the voltage stability of the three-phase power distribution network; photovoltaic DC/DC converter: obtaining a maximum power point through a maximum power algorithm, and then realizing rated power transmission by adopting power outer loop and current inner loop control; energy storage DC/DC converter: the system sets a current instruction reference value of the energy storage converter according to the voltage value of the direct current side and the SOC state of the energy storage battery, so that power cooperative output is realized, and the voltage stability of a direct current bus is maintained.
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| CN111740447A (en) * | 2020-07-02 | 2020-10-02 | 云南电网有限责任公司电力科学研究院 | Cooperative control method of energy router |
| CN112018825A (en) * | 2020-09-18 | 2020-12-01 | 云南电网有限责任公司电力科学研究院 | Energy coordination control method for multi-port electric energy router |
| CN112671038A (en) * | 2020-12-24 | 2021-04-16 | 深圳市优优绿能电气有限公司 | Multivariable and multi-target PI double closed-loop control method and computer readable storage medium |
| CN113113912A (en) * | 2021-04-09 | 2021-07-13 | 湖南大学 | Multi-mode cooperative control method and system for four-port energy router |
| CN113964868A (en) * | 2021-11-03 | 2022-01-21 | 中国科学院电工研究所 | Photovoltaic multi-port power coordination control method suitable for multi-mode wide range |
| CN114362162A (en) * | 2022-01-12 | 2022-04-15 | 西南交通大学 | Railway energy route regulation and control method based on photovoltaic energy storage system |
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