CN112865106A - AC/DC hybrid micro-grid power scheduling method considering charge state - Google Patents

AC/DC hybrid micro-grid power scheduling method considering charge state Download PDF

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CN112865106A
CN112865106A CN202011542923.1A CN202011542923A CN112865106A CN 112865106 A CN112865106 A CN 112865106A CN 202011542923 A CN202011542923 A CN 202011542923A CN 112865106 A CN112865106 A CN 112865106A
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power
energy storage
storage unit
microgrid
surplus
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马振
肖宇
鄂霖
朱永强
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North China Electric Power University
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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
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides an alternating current-direct current hybrid micro-grid power scheduling method considering energy storage charge state, which comprises the following steps: and dividing working conditions of the alternating current-direct current hybrid micro-grid and the state of charge (SOC) of the energy storage unit and a corresponding power regulation strategy. The method comprises the following steps: firstly, acquiring the power generation and load power of the AC sub-microgrid, the AC frequency, the power generation and load power of the DC sub-microgrid, the DC bus voltage and the energy storage charge state, and dividing 7 the working conditions according to the acquired parameters; then, a power scheduling method is designed by combining specific working conditions with the aim of maximally utilizing the new energy power supply and considering constraint conditions meeting system power balance and direct-current voltage and alternating-current frequency; and finally, reasonably distributing power by controlling the current converter.

Description

AC/DC hybrid micro-grid power scheduling method considering charge state
Technical Field
The invention belongs to the field of power scheduling of an alternating current and direct current hybrid micro-grid, and particularly relates to a power scheduling method of the alternating current and direct current hybrid micro-grid considering the charge state of an energy storage unit.
Technical Field
With the widespread popularization of new energy resources represented by wind and light power generation units and distributed power generation technologies, micro-grids that can fully utilize new energy resources and distributed power sources have attracted attention. The micro-grid system is an effective way for ensuring stable power supply in remote areas such as islands and the like, and is also an important supplementary means for large-scale power systems.
The primary task of the micro-grid system is to keep stable operation, and then to carry out energy optimization scheduling on various power generation units on the basis, so that the economy of the micro-grid system is improved. The micro-grid system is stable in voltage, frequency and power angle. The output of wind and light power generation units in the distributed power supply is greatly influenced by natural condition factors such as wind speed, illumination intensity and temperature, the power output has fluctuation and intermittence, the fluctuation proportion is often high, the operation of a micro-grid is greatly impacted, the stable operation of the system is not facilitated, and the energy optimization scheduling of the whole system is also greatly difficult.
Therefore, whether the independently operated micro-grid system can ensure stable and economic operation under the condition of minimizing energy storage configuration or not is the key for the large-scale application of the micro-grid system, and the economy of the micro-grid system is improved. In the above background, there is a need for an ac/dc hybrid microgrid power scheduling method considering an energy storage state of charge (SOC).
Disclosure of Invention
The invention provides an alternating current-direct current hybrid micro-grid power scheduling method considering the charge state of an energy storage unit, which aims to keep stable operation and then performs energy optimized scheduling on various power generation units on the basis, so that the economical efficiency of the power scheduling method is improved.
Acquiring basic information of the AC/DC hybrid micro-grid, including power P of the AC sub-micro-grids-acAC load Pl-acAC frequency facDC power supply power Ps-dcDC load Pl-dcDC voltage UdcInterconnected converter (ILC) power PILC(the direction of the alternating current micro-grid flow to the direct current micro-grid is taken as positive) and an energy storage unit SOC.
And judging whether the two sub-microgrids of the alternating current-direct current hybrid microgrid are in surplus or loss states respectively according to the acquired information, and judging whether the energy storage unit is in a chargeable, dischargeable or chargeable and dischargeable state. The power states of the alternating current-direct current hybrid micro-grid are divided into three main categories, namely: double-end loss, double-end surplus, one filling and one loss; the energy storage unit SOC is divided into: chargeable, dischargeable and chargeable and dischargeable states.
The combination of the above conditions can obtain 9 combinations, and the power regulation can be simplified into 7 working conditions. According to the principle of keeping the system stably running and fully utilizing new energy to generate power, a specific power scheduling strategy is formulated:
working condition 1: due to loss of the two ends of the AC/DC sub-microgrid, the energy storage unit is in a dischargeable and chargeable/dischargeable state, at the moment, the energy storage unit needs to discharge outwards to provide power support, and if the system power shortage is not met, the micro gas turbine needs to be started to increase the power.
Working condition 2: due to the fact that the two ends of the AC/DC sub-microgrid are damaged, the energy storage unit is in a chargeable state, the energy storage unit cannot discharge externally to provide power support, and the micro gas turbine is required to start and increase power.
Working condition 3: the excess of the two ends of the AC/DC sub-microgrid is obtained, the energy storage unit is in a chargeable and chargeable/dischargeable state, the energy storage unit needs to be charged to absorb excess power at the moment, and if the excess power cannot be absorbed in full, a system power supply is needed to reduce the power generation power.
Working condition 4: the surplus of the double ends of the AC/DC sub-microgrid exists, the energy storage unit is in a dischargeable state, and the energy storage unit cannot be charged to absorb surplus power at the moment, so that a system power supply is needed to reduce the power generation power.
Working condition 5: the AC/DC sub-microgrid is full and deficient, the energy storage unit is in a chargeable state, the interconnection converter is preferentially used to transfer power to the deficient loss side at the moment, the total power shortage of the system is calculated, if the total power shortage of the system exists, the energy storage unit cannot discharge externally to provide power support at the moment, and the micro gas turbine is required to start and increase the power generation.
If the system is totally surplus in power, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot fully absorb the surplus power, the system power supply is needed to reduce the power generation power.
Working condition 6: and when the AC/DC sub-microgrid is full and deficient, the energy storage unit is in a chargeable and dischargeable state, the interconnection converter is preferentially used to transfer power to the deficient side, and the total power shortage of the system is calculated. If the system is totally lack of power, the energy storage unit needs to discharge outwards to provide power support, and when the system power shortage is not met, the micro gas turbine needs to start power-up;
if the system is totally surplus in power, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot fully absorb the surplus power, the system power supply is needed to reduce the power generation power.
Working condition 7: the AC/DC sub-microgrid has sufficient and insufficient power, the energy storage unit is in a dischargeable state, the interconnected converter is preferentially used to transfer power to the insufficient side at the moment, the total power shortage of the system is calculated, if the total power shortage of the system exists, the energy storage unit needs to discharge outwards to provide power support, and when the power shortage of the system is not met, the micro gas turbine is needed to start the power increase;
if the system is totally surplus in power, the energy storage unit cannot be charged to absorb the surplus power at the moment, and a system power supply is needed to reduce the power generation power.
Drawings
The technical solution of the present invention is further described in detail by the accompanying drawings.
Fig. 1 is an ac/dc hybrid microgrid topology.
Fig. 2 is a flow of a power scheduling method of an ac/dc hybrid microgrid in consideration of a state of charge.
Fig. 3 is a division of the energy storage unit state of charge.
Detailed Description
As shown in fig. 1, the ac/dc hybrid microgrid topological diagram is divided into an ac microgrid and a dc microgrid, wherein an ac microgrid power supply is a wind turbine, a micro gas turbine is a standby capacity responsible for peak shaving, and the ac microgrid is further connected with an ac load; the power supply of the direct current sub-microgrid is a photovoltaic unit, and the direct current sub-microgrid is also connected with a direct current load and an energy storage unit. The AC-DC sub-microgrid is connected with a solid-state switch (STS) through an interconnection Inverter (ILC).
The power scheduling method comprises the following steps of firstly obtaining basic information of an alternating current-direct current hybrid micro-grid, including alternating current-direct current hybrid micro-grid, as shown in a flow chart of fig. 2Power P of current microgrid power supplys-acAC load Pl-acAC frequency facDC power supply power Ps-dcDC load Pl-dcDC voltage UdcInterconnected converter (ILC) power PILC(the direction of the alternating current micro-grid flow to the direct current is positive) and an energy storage unit SOC;
ΔPac＝Ps-ac-Pl-ac (1)
ΔPdc＝Ps-dc-Pl-dc (2)
ΔP＝ΔPac+ΔPdc (3)
obtaining the delta P according to the obtained informationac、ΔPdcThe delta P and the SOC are used for judging whether the two sub-microgrids of the alternating current-direct current hybrid microgrid are in surplus or loss states respectively; since the energy storage unit cannot be overcharged and overdischarged (SOC cannot be too close to 0 or 1), it is determined whether the energy storage unit is in a chargeable, dischargeable, or chargeable and dischargeable state in conjunction with the state of charge division shown in fig. 3.
According to the running state judgment of the alternating current-direct current hybrid micro-grid, the power states are divided into three categories, namely: double-end loss, double-end surplus, one filling and one loss; the energy storage unit SOC is divided into: the charging, discharging and charging and discharging states are combined to obtain 9 combinations, and the power regulation and control can be simplified into 7 working conditions.
The primary task of the micro-grid system is to keep stable operation, and then to carry out energy optimization scheduling on various power generation units on the basis, so that new energy is fully utilized, and the economy of the micro-grid system is improved. According to the principle, 7 working conditions of the system are combined, and the following specific power scheduling strategies are made:
working condition 1: double-end defect delta P of AC/DC sub-microgridac<0 and Δ Pdc<0, the energy storage unit is in a dischargeable and chargeable-dischargeable state, namely, m is more than or equal to SOC is less than or equal to 1, the energy storage unit needs to discharge outwards to provide power support, and if the system power shortage is not met, the micro gas turbine needs to start and increase the power。
Working condition 2: double-end defect delta P of AC/DC sub-microgridac<0 and Δ Pdc<0, the energy storage unit is in a chargeable state, namely SOC is more than or equal to 0 and less than or equal to m, the energy storage unit can not discharge externally to provide power support, and the micro gas turbine needs to be started to increase power.
Working condition 3: AC-DC sub-microgrid double-end surplus namely delta Pac>0 and Δ Pdc>0, the energy storage unit is in a chargeable and chargeable state, namely SOC is more than or equal to 0 and less than or equal to n, at the moment, the energy storage unit needs to be charged to absorb redundant power, and if the redundant power cannot be fully absorbed, a system power supply is needed to reduce the power generation power.
Working condition 4: AC-DC sub-microgrid double-end surplus namely delta Pac>0 and Δ Pdc>0, the energy storage unit is in a dischargeable state, namely n is more than or equal to SOC and less than or equal to 1, the energy storage unit cannot be charged to absorb redundant power at the moment, and a system power supply is needed to reduce the power generation power.
Working condition 5: AC-DC sub-microgrid one-filling-one-deficiency, namely delta Pac>0 and Δ Pdc<0 (or Δ P)ac<0 and Δ Pdc>0) The energy storage unit is in a chargeable state, namely SOC is more than or equal to 0 and less than or equal to m, at the moment, the interconnected converters are preferentially used for transferring power to flow to the loss side, the total power shortage of the system is calculated, and if the total power shortage of the system is delta P<0, at the moment, the energy storage unit cannot discharge externally to provide power support, and the micro gas turbine is required to start power increasing;
if the total surplus power of the system is larger than delta P0, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot absorb the surplus power in full, a system power supply is needed to reduce the power generation power.
Working condition 6: AC-DC sub-microgrid one-filling-one-deficiency, namely delta Pac>0 and Δ Pdc<0 (or Δ P)ac<0 and Δ Pdc>0) The energy storage unit is in a chargeable and dischargeable state, namely m is less than or equal to SOC and less than or equal to n, at the moment, the interconnected converters are preferentially used for transferring power to flow to the loss side, the total power shortage of the system is calculated, and if the total power shortage of the system is delta P<0, the energy storage unit needs to provide power support for external discharge at the moment, and when the power shortage of the system is not met, the micro gas turbine needs to start the power increasing;
if the total surplus power of the system is larger than delta P0, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot absorb the surplus power in full, a system power supply is needed to reduce the power generation power;
working condition 7: AC-DC sub-microgrid one-filling-one-deficiency, namely delta Pac>0 and Δ Pdc<0 (or Δ P)ac<0 and Δ Pdc>0) When the energy storage unit is in a dischargeable state n and SOC are less than or equal to 1, the interconnected converters are preferentially used for transferring power to flow to the loss side, the total power shortage of the system is calculated, and if the total power shortage of the system is delta P<0, the energy storage unit needs to discharge outwards to provide power support, and when the system power shortage is not met, the micro gas turbine needs to start power-increasing power;
if the total surplus power delta P of the system is greater than 0, the energy storage unit cannot be charged to absorb the surplus power at the moment, and the system power supply is needed to reduce the generating power.
After the specific operation condition of the system is obtained, each converter of the alternating current-direct current hybrid micro-grid is controlled to operate according to the power scheduling strategy, and the requirement of stable operation can be kept, namely the alternating current frequency facAnd a direct current voltage UdcThe method cannot exceed the limit, realizes the full utilization of new energy and improves the economy of the new energy.

Claims (3)

1. The power scheduling method of the alternating current-direct current hybrid micro-grid considering the energy storage charge state is characterized by comprising the following steps of:
(1) acquiring basic information of the AC/DC hybrid micro-grid, including power P of the AC sub-micro-grids-acAC load power Pl-acAC frequency facDC power supply power Ps-dcDC load Pl-dcDC voltage UdcInterconnected converter (ILC) power PILCAnd an energy storage unit state of charge (SOC);
(2) according to the obtained information, the two sub-microgrids of the alternating current-direct current hybrid microgrid are judged to be in surplus or loss states respectively, and the energy storage unit is judged to be in a chargeable, dischargeable or chargeable-dischargeable state;
(3) and selecting a control strategy on the basis of considering the state of charge (SOC) of the energy storage unit according to the principle of keeping the system to stably operate and fully utilizing new energy to generate power from the alternating current and direct current hybrid microgrid state obtained in the last step.
2. The method for acquiring information and determining the power state of the alternating current-direct current hybrid microgrid according to claim 1 comprises three categories, namely: judging whether the energy storage unit is in a chargeable, dischargeable or chargeable state due to double-end loss, double-end surplus and one surplus and deficiency; the combination of the above conditions can obtain 9 combinations, and the power regulation can be simplified into 7 working conditions.
3. The 7 working conditions according to claim 2, wherein a specific power scheduling strategy is formulated according to the principle of keeping the system stably running and fully utilizing new energy to generate power:
working condition 1: due to loss of the two ends of the AC/DC sub-microgrid, the energy storage unit is in a dischargeable and chargeable/dischargeable state, at the moment, the energy storage unit needs to discharge outwards to provide power support, and if the power shortage of the system is not met, the micro gas turbine needs to start the power increasing;
working condition 2: due to the loss of the two ends of the AC/DC sub-microgrid, the energy storage unit is in a chargeable state, and the energy storage unit cannot discharge externally to provide power support at the moment and needs a micro gas turbine to start and increase power;
working condition 3: the excess of the two ends of the AC/DC sub-microgrid exists, the energy storage unit is in a chargeable and chargeable/dischargeable state, at the moment, the energy storage unit needs to be charged to absorb excess power, and if the excess power cannot be absorbed in full, a system power supply is needed to reduce the power generation power;
working condition 4: the surplus of the two ends of the AC/DC sub-microgrid exists, the energy storage unit is in a dischargeable state, and the energy storage unit cannot be charged to absorb surplus power at the moment and needs a system power supply to reduce the power generation power;
working condition 5: the AC/DC sub-microgrid has sufficient and insufficient energy, the energy storage unit is in a chargeable state, the interconnected converter is preferentially used to transfer power to the insufficient side at the moment, the total power shortage of the system is calculated, if the total power shortage of the system exists, the energy storage unit can not discharge externally to provide power support at the moment, and the micro gas turbine is required to start and increase power;
if the system is totally surplus power, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot absorb the surplus power in full, a system power supply is needed to reduce the power generation power;
working condition 6: the alternating current-direct current sub-microgrid has the advantages that the alternating current-direct current sub-microgrid has the first surplus and the second deficit, the energy storage unit is in the chargeable and dischargeable state, the interconnection converter is preferentially used at the moment to transfer power to the deficit side, and the total power shortage of the system is calculated. If the system is totally lack of power, the energy storage unit needs to discharge outwards to provide power support, and when the system power shortage is not met, the micro gas turbine needs to start power-up;
if the system is totally surplus power, the energy storage unit needs to be charged to absorb the surplus power, and when the energy storage unit cannot absorb the surplus power in full, a system power supply is needed to reduce the power generation power;
working condition 7: the AC/DC sub-microgrid has sufficient and insufficient power, the energy storage unit is in a dischargeable state, the interconnected converter is preferentially used to transfer power to the insufficient side at the moment, the total power shortage of the system is calculated, if the total power shortage of the system exists, the energy storage unit needs to discharge outwards to provide power support, and when the power shortage of the system is not met, the micro gas turbine is needed to start the power increase;
if the system is totally surplus in power, the energy storage unit cannot be charged to absorb the surplus power at the moment, and a system power supply is needed to reduce the power generation power.
CN202011542923.1A 2020-12-23 2020-12-23 AC/DC hybrid micro-grid power scheduling method considering charge state Pending CN112865106A (en)

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