CN108631366B - High-robustness microgrid off-grid coordination control method - Google Patents
High-robustness microgrid off-grid coordination control method Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 91
- 238000007599 discharging Methods 0.000 claims description 25
- 238000010248 power generation Methods 0.000 claims description 19
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 231100000817 safety factor Toxicity 0.000 description 2
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- H02J3/383—
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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
- H02J3/28—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
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a high-robustness off-grid coordination control method for a microgrid, which is suitable for an off-grid microgrid system with a battery as a VF source, wherein a plurality of battery electric quantity thresholds are set, the SOC of the battery is collected in real time, the target charge and discharge power of an energy storage system is obtained according to the SOC value, and the power supply power and load switching in the microgrid are controlled according to the target charge and discharge power of the energy storage system; when the load needs to be switched, the control scene after the switch refuses to be switched can be dealt with; and a safety mode which can be set by a user is added, and an operator is informed to close the switch to replace an automatic switch, so that the personal safety problem caused by closing the switch is solved. The control method can maintain the SOC of the battery in a reasonable range in an off-grid state, improve the off-grid running time of the micro-grid, avoid control failure caused by switch failure, improve the robustness of micro-grid control, and is suitable for practical engineering application.
Description
Technical Field
The invention belongs to the technical field of intelligent power grids, and particularly relates to a high-robustness off-grid coordination control method for a micro-grid.
Background
The microgrid has two operation modes of grid connection and grid disconnection, and can be operated in a grid disconnection mode when an external power grid fails, so that uninterrupted power supply of important loads inside the microgrid is guaranteed. In order to increase the running time of an off-grid microgrid, it is necessary to ensure that a VF power supply serving as a balance node in the microgrid operates normally. For a micro-grid system which is configured with energy storage and takes the energy storage as a system VF source, the energy storage needs to be ensured to have a certain SOC (state of charge), namely the percentage of the residual electric quantity, if the SOC is too high, the energy storage cannot be charged, and the system voltage is increased under the condition of excess system power supply, so that equipment trips in an overvoltage manner; if the SOC is too low, the stored energy cannot be discharged, the system voltage is reduced under the condition that the power supply is insufficient, and the equipment trips at a low voltage. Therefore, it is necessary to maintain a reasonable SOC by controlling other PQ (active and reactive) power supplies, so as to ensure a certain charging capacity and maintain a certain amount of electricity to cope with the situation of insufficient power supplies.
When the micro-grid runs off the grid, the voltage frequency of the system needs to be maintained to be stable through control, so that a control algorithm is very important. Meanwhile, especially for a low-voltage microgrid, the investment of users is low, so that the performance of the switch is poor, and the condition that the switch fails to operate easily occurs. In order to avoid control algorithm failure caused by switch failure, certain remedial measures need to be provided for the situation, and the robustness of the microgrid control system is improved.
Meanwhile, the microgrid controls more and more intellectualization and unmanned operation, however, the microgrid control system cannot automatically detect whether people are in construction on a line, the operation of automatically closing a switch may bring personal safety problems, and in order to balance the contradiction between intellectualization and safety, two schemes need to be set for users to select.
The invention discloses an off-grid control method of a microgrid, which is disclosed as Chinese patent application No. CN201310594821.8, application date 2013, 11, 21, publication No. CN103683322B, publication date 2015, 8, 19. When Ppcs is more than 20kW, traversing 5 small photovoltaic power supplies, traversing combinations of the 5 small photovoltaic power supplies in pairs, cutting off small-range photovoltaic power exceeding a certain power, traversing 3 large photovoltaic power supplies, traversing combinations of the 3 large photovoltaic power supplies in pairs, and cutting off large photovoltaic power exceeding a certain power range; meanwhile, when Ppcs < -20kW, all photovoltaics are put on, and the load exceeding a certain power range is cut off. And acquiring a data set consisting of the power predicted values of the photovoltaic power station. The photovoltaic power is controlled based on the current power of the stored energy, and the SOC of the stored energy cannot be accurately controlled.
The invention discloses a micro-grid off-grid coordination control system and a micro-grid off-grid coordination control method based on Chinese patent application No. CN201310544629.8, application date 2013, 11 month and 06 day, publication No. CN103545843A, publication date 2014, 01 month and 29 day. The invention discloses a microgrid off-grid coordination control system and a method thereof. The control method of the invention comprises the following steps: the coordination controller finishes acquisition of power and SOC value data information of the intermittent power supply, the energy storage unit and the load, judges power, SOC, breaker state and intermittent power supply power information of the energy storage battery, forms a control command of the intermittent power supply and the load through two intermediate links of energy storage power management and intermittent power supply power adjustment, and issues a power adjustment value and a signal output value to the power generation unit and the load through a communication line to finish control of the intermittent power supply and the load. The invention fails to deal with the situation of switch control failure, and the algorithm may fail due to switch abnormality. Meanwhile, the personal safety problem caused by closing the switch cannot be considered, and potential safety hazards exist.
In view of this, a high-robustness microgrid off-grid coordination control method needs to be provided, which can accurately control the energy storage SOC; meanwhile, the condition of switch operation failure can be processed, and the robustness of the control system is improved; and the personal safety problem brought by closing the switch is considered.
Disclosure of Invention
The invention aims to provide a high-robustness microgrid off-grid coordination control method which is suitable for an off-grid microgrid system with an energy storage VF control mode, so that the running time of an off-grid microgrid is improved, the robustness of a microgrid control system is improved, and the personal safety problem caused by switching on and switching off is further considered.
In order to achieve the above purpose, the solution of the invention is: a high-robustness microgrid off-grid coordination control method comprises the following steps of:
step 1: judging an SOC threshold interval in which the current SOC value of the energy storage battery is positioned, and setting target charge and discharge power;
step 2: controlling the switching of the power and the load of other power sources according to the target charge-discharge power of the energy storage system;
and step 3: setting a priority ranking of the operable switches, and operating the switches in the order of priority from high to low; if the operation of the high-priority switch fails, the switch with a lower priority is operated, and an operation switch failure signal is sent to prompt an operator to overhaul the switch; if there is one or only one operable switch and the switch operation fails, the operating switch is skipped, and the subsequent control is executed.
Further, the method further comprises:
and 4, step 4: for the operation of closing the switch, firstly judging whether the switch is in a safe mode at present, if so, sending an alarm signal to prompt a user that the switch can be manually closed after the circuit is checked; if not, the program automatically closes the switch.
Further, in the step 1, the SOC threshold intervals are an SOC upper limit threshold socigh, an SOC optimal threshold socompt, an SOC middle threshold SOCmiddle, an SOC low threshold SOClow and an SOC lower limit threshold SOCmin respectively; satisfies the following conditions: SOChigh > SOCopt + Th > SOCopt-Th > SOCmdle > SOClow > SOCmin, wherein Th is a dead zone fixed value;
further, the method for representing the charge and discharge power of the energy storage system in the step 1 is as follows:
the method for obtaining the target charging and discharging of the energy storage system according to the SOC of the energy storage battery comprises the following steps: if the SOC is larger than SOChigh, the target charging and discharging power of the energy storage system is Pcast; if the SOC is between SOCopt + Th and SOChigh, the target charging and discharging power of the energy storage system is Pslow; if the SOC is between SOCopt-Th and SOCopt + Th, the target charging and discharging power of the energy storage system is 0; if the SOC is located between the SOCmdle and the SOCopt-Th, the target charging and discharging power of the energy storage system is-Pslow; if the SOC is between the SOCmin and the SOCmiddle, the target charge-discharge power of the energy storage system is-Pcast; if the number of the equipment is less than the SOCmin, stopping all equipment;
wherein the energy storage power is negative, which represents charging; pcast is an energy storage fast discharge power fixed value, Pslow is an energy storage slow discharge power fixed value, -Pcast is an energy storage fast charging power fixed value, Pslow is an energy storage slow charging power fixed value, and Pcast > Pslow is met;
further, the switching method for controlling the power and the load of other power sources according to the target charging and discharging power of the energy storage system in the step 2 comprises the following steps:
when the charging and discharging target power of the energy storage system is Pfast, if the current power of the energy storage system is smaller than Pfast, preferentially judging whether a load is cut off or not, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if the output power is 0, limiting the output power of other power supplies;
when the charging and discharging target power of the energy storage system is Pslow, if the current power of the energy storage system is smaller than Pslow, preferentially judging whether a load is removed once, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if the output power is 0, limiting the output power of other power supplies;
when the charging and discharging target power of the energy storage system is-Pslow, if the current power of the energy storage system is larger than-Pslow, preferentially judging whether the photovoltaic power generation system is limited in power, and if so, cancelling photovoltaic power limitation; if not, judging whether the other power supplies are limited to output power, and if so, canceling the output power of the other power supplies;
when the charging and discharging target power of the energy storage system is-Pfast, if the current power of the energy storage system is greater than-Pfast, preferentially judging whether the photovoltaic is limited in power, and if so, canceling the photovoltaic power limitation; if not, judging whether the other power supplies are limited to output power, and if so, canceling the output power of the other power supplies; if the SOC of the energy storage battery is between SOCmin and SOClow and other power sources cannot increase the output, part of the non-important load is cut off.
Further, in step 3, the switch priority ordering is performed according to the load importance and the power matching principle: if the switch is closed, the priority of the important load is high, and the priority of the load matched with the excess power of the system is high; if the switch is switched on and off, the priority of unimportant load is high, and the priority of load matched with the system shortage power is high.
Further, setting a safe mode switching control word in the step 4 to control the switching of the safe mode.
Compared with the closest prior art, the invention has the beneficial effects that:
the invention provides a high-robustness microgrid off-grid coordination control method, which is used for controlling the output of other power supplies and the switching of loads according to the SOC value, considering the switching on and off failure and personal safety factors, has the advantages of improving the off-grid microgrid operation time, improving the robustness of a microgrid control system, solving the personal safety problem caused by automatic control and the like, and has practicability and feasibility.
Drawings
Fig. 1 is a flow chart of a high-robustness off-grid coordination control method for a microgrid.
Fig. 2 is the control logic when the energy storage system SOC is high.
Fig. 3 is the control logic when the energy storage system SOC is low.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention provides a high-robustness off-grid coordination control method for a micro-grid, which is used for controlling the output of other power supplies and the switching of loads according to the SOC value of an energy storage battery and considering the switching on and off failure of a switch and personal safety factors.
The embodiment of the high-robustness off-grid coordination control method for the microgrid disclosed by the invention is shown in fig. 1, and specifically comprises the following steps:
(1) judging an SOC threshold interval in which the current SOC value of the energy storage battery is positioned, and setting target charge and discharge power; the SOC values are an SOC upper limit threshold SOChigh, an SOC optimal threshold SOCopt, an SOC middle threshold SOCmdle, an SOC low threshold SOClow and an SOC lower limit threshold SOCmin respectively; satisfies the following conditions: SOChigh > SOCopt + Th > SOCopt-Th > SOCmdle > SOClow > SOCmin, wherein Th is a dead zone fixed value;
(2) setting the charging and discharging fixed value of the energy storage system: pcast is an energy storage fast discharge power fixed value, Pslow is an energy storage slow discharge power fixed value, -Pcast is an energy storage fast charging power fixed value, Pslow is an energy storage slow charging power fixed value, and Pcast > Pslow is met.
If the SOC of the energy storage battery is larger than SOChigh, the target charging and discharging power of the energy storage system is Pfast; if the SOC is between SOCopt + Th and SOChigh, the target charging and discharging power of the energy storage system is Pslow; if the SOC is between SOCopt-Th and SOCopt + Th, the target charging and discharging power of the energy storage system is 0; if the SOC is located between the SOCmdle and the SOCopt-Th, the target charging and discharging power of the energy storage system is-Pslow; if the SOC is between the SOCmin and the SOCmiddle, the target charge-discharge power of the energy storage system is-Pcast; if the number of the equipment is less than the SOCmin, stopping all equipment;
(3) if the SOC of the energy storage battery is larger than SOChigh, judging whether the power of the energy storage system is larger than Pfast; if not, preferentially judging whether a load is cut off or not, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if 0, the other power output is limited.
(4) If the SOC of the energy storage battery is between SOCopt + Th and SOChigh, judging whether the power of the energy storage system is greater than Pslow; if not, preferentially judging whether a load is cut off or not, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if 0, the other power output is limited.
(5) And if the SOC of the energy storage battery is between SOCopt-Th and SOCopt + Th, limiting the power of the energy storage system to be 0 through control.
(6) If the SOC of the energy storage battery is located between SOCmdle and SOCopt-Th, judging whether the power of the energy storage system is smaller than-Pslow; if the photovoltaic power generation system is not limited, preferentially judging whether the photovoltaic power generation system is limited in power, and if the photovoltaic power generation system is limited, cancelling the photovoltaic power limitation; if not, judging whether the other power supplies are limited to output or not, and if so, canceling the output of the other power supplies.
(7) If the SOC of the energy storage battery is between the SOClow and the SOCniddle, judging whether the power of the energy storage system is less than-Pcast; if the photovoltaic power generation system is not limited, preferentially judging whether the photovoltaic power generation system is limited in power, and if the photovoltaic power generation system is limited, cancelling the photovoltaic power limitation; if not, judging whether the other power supplies are limited to output or not, and if so, canceling the output of the other power supplies.
(8) If the SOC of the energy storage battery is between SOCmin and SOClow, judging whether the power of the energy storage system is smaller than-Pcast; if the photovoltaic power generation system is not limited, preferentially judging whether the photovoltaic power generation system is limited in power, and if the photovoltaic power generation system is limited, cancelling the photovoltaic power limitation; if not, judging whether the other power supplies are limited to output power, and if so, canceling the output power of the other power supplies; if not, then the insignificant load is cut off based on the power deficit.
(9) And if the SOC of the energy storage battery is smaller than the SOCmin, stopping all power supplies in the microgrid.
Fig. 2 and 3 show the control logic when the energy storage system SOC is high and the control logic when the energy storage system SOC is low, respectively.
(10) Aiming at the operation switches, firstly, the priorities of all the operable switches are sorted, if the operation of the high-priority switch fails, the operation of the switch with lower priority is switched, and an operation switch failure signal is sent to prompt an operator to overhaul the switch; if there is one or only one operable switch and the switch operation fails, the operating switch is skipped, and the subsequent control is executed.
(11) For the operation of closing the switch, firstly judging whether the switch is in a safe mode at present, if so, sending an alarm signal to prompt a user that the switch can be manually closed after the circuit is checked; if not, the program automatically closes the switch. And setting a safe mode switching control word to control the switching of the safe mode.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (6)
1. A high-robustness microgrid off-grid coordination control method is characterized by comprising the following steps of:
step 1: judging an SOC threshold interval in which the current SOC value of the energy storage battery is positioned, and setting target charge and discharge power;
step 2: controlling the switching of the power and the load of other power sources according to the target charge-discharge power of the energy storage system;
and step 3: setting a priority ranking of the operable switches, and operating the switches in the order of priority from high to low; if the operation of the high-priority switch fails, the switch with a lower priority is operated, and an operation switch failure signal is sent to prompt an operator to overhaul the switch; if there is only one operable switch and the switch operation fails, skipping the operating switch and executing the subsequent control;
and 4, step 4: judging whether the switch is in a safe mode or not at present according to the operation of the switch, and if the switch is in the safe mode, sending an alarm signal to prompt a user to manually switch on the switch after the circuit is checked; if not, the program automatically closes the switch.
2. The high-robustness microgrid off-grid coordination control method according to claim 1, characterized in that: in the step 1, the SOC threshold intervals are an SOC upper limit threshold SOChigh, an SOC optimal threshold SOCopt, an SOC middle threshold SOCmdle, an SOC low threshold SOClow and an SOC lower limit threshold SOCmin respectively; satisfies the following conditions: SOChigh > SOCopt + Th > SOCopt-Th > SOCmdle > SOClow > SOCmin, where Th is the dead zone fixed value.
3. The high-robustness microgrid off-grid coordination control method according to claim 2, wherein the method for obtaining target charging and discharging of the energy storage system according to the SOC of the energy storage battery in the step 1 specifically comprises:
if the SOC of the energy storage battery is larger than SOChigh, the target charging and discharging power of the energy storage system is Pfast; if the SOC is between SOCopt + Th and SOChigh, the target charging and discharging power of the energy storage system is Pslow; if the SOC is between SOCopt-Th and SOCopt + Th, the target charging and discharging power of the energy storage system is 0; if the SOC is located between the SOCmdle and the SOCopt-Th, the target charging and discharging power of the energy storage system is-Pslow; if the SOC is between the SOCmin and the SOCmiddle, the target charge-discharge power of the energy storage system is-Pcast; if the number of the equipment is less than the SOCmin, stopping all equipment;
wherein the energy storage power is negative, which represents charging; pcast is an energy storage fast discharge power fixed value, Pslow is an energy storage slow discharge power fixed value, -Pcast is an energy storage fast charging power fixed value, Pslow is an energy storage slow charging power fixed value, and Pcast > Pslow is met.
4. The high-robustness microgrid off-grid coordination control method according to claim 3, characterized in that: in the step 2, the method for controlling the power and load switching of other power supplies according to the target charging and discharging power of the energy storage system specifically comprises the following steps:
when the charging and discharging target power of the energy storage system is Pfast, if the current power of the energy storage system is smaller than Pfast, preferentially judging whether a load is cut off or not, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if the output power is 0, limiting the output power of other power supplies;
when the charging and discharging target power of the energy storage system is Pslow, if the current power of the energy storage system is smaller than Pslow, preferentially judging whether a load is removed once, and if so, combining the loads; if not, judging whether the output of the photovoltaic power generation system is 0, and if not, limiting the photovoltaic power; if the output power is 0, limiting the output power of other power supplies;
when the charging and discharging target power of the energy storage system is-Pslow, if the current power of the energy storage system is larger than-Pslow, preferentially judging whether the photovoltaic power generation system is limited in power, and if so, cancelling photovoltaic power limitation; if not, judging whether the other power supplies are limited to output power, and if so, canceling the output power of the other power supplies;
when the charging and discharging target power of the energy storage system is-Pfast, if the current power of the energy storage system is greater than-Pfast, preferentially judging whether the photovoltaic power generation system is limited in power, and if so, canceling the photovoltaic power limitation; if not, judging whether the other power supplies are limited to output power, and if so, canceling the output power of the other power supplies; if the SOC of the energy storage battery is between SOCmin and SOClow and other power sources cannot increase the output, part of the non-important load is cut off.
5. The high-robustness microgrid off-grid coordination control method according to claim 1, characterized in that: the switch priority ordering in step 3 is performed according to load importance and a power matching principle: if the switch is closed, the priority of the important load is higher, and the priority of the load matched with the excess power of the system is higher; if the switch is switched on or off, the priority of the unimportant load is higher, and the priority of the load matched with the system shortage power is higher.
6. The high-robustness microgrid off-grid coordination control method according to claim 1, characterized in that: and 4, setting a safe mode switching control word to control the switching of the safe mode.
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