CN109904866B - Multi-energy-storage microgrid grid-connected coordination control method and system - Google Patents
Multi-energy-storage microgrid grid-connected coordination control method and system Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 320
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 92
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 90
- 238000010248 power generation Methods 0.000 claims abstract description 32
- 230000002457 bidirectional effect Effects 0.000 claims description 46
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a multi-energy-storage microgrid grid-connected coordination control method and a system thereof, wherein the method comprises the following steps: the energy storage management station receives a control instruction of the micro-grid energy management system and a state feedback instruction of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module to control the first energy storage converter and the second energy storage converter, and controls the super capacitor and the lithium iron phosphate battery to work in any one of the following working states: the working state I is as follows: the multi-element energy storage system adopts a working state of smooth power fluctuation; and a second working state: the multivariate energy storage system adopts the working state of tracking and scheduling output; and a third working state: the multi-element energy storage system adopts the working state of peak clipping and valley filling. The invention improves the reliability of the micro-grid operation and ensures the safety and stability of the wind power generation system and the photovoltaic power generation system connected to the large grid system.
Description
Technical Field
The invention relates to a multi-energy-storage microgrid grid-connected coordination control method and a system thereof, belonging to the technical field of microgrid grid-connected operation.
Background
The micro-grid provides a reasonable direction for solving the problem that large-scale new energy is connected into the power grid.
A typical microgrid consists of distributed power generation units, an energy storage system and loads, the microgrid energy management system controls the operation mode of the microgrid, and an energy storage management station controls the working state of the energy storage system. The existing microgrid energy storage system mostly adopts a storage battery energy storage form, and the problems of battery overcharge and overdischarge, service life reduction and the like are easily caused by different power changes, load fluctuation, microgrid operation modes and energy storage system working states under different time scales.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a microgrid grid-connected coordination control method and a microgrid grid-connected coordination control system for multi-energy storage, which improve the reliability of microgrid operation, ensure the safety and stability of a wind power generation system and a photovoltaic power generation system connected to a large power grid system, and meet the requirements of a microgrid on different working states of a multi-energy storage system in a grid-connected mode.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention discloses a coordination control method for a grid-connected operation mode of a multi-element energy storage microgrid, which comprises the following steps:
the energy storage management station receives a control instruction of the micro-grid energy management system and a state feedback instruction of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module to control the first energy storage converter and the second energy storage converter, and controls the super capacitor and the lithium iron phosphate battery to work in any one of the following working states:
the working state I is as follows: the multi-element energy storage system adopts a working state of smooth power fluctuation;
and a second working state: the multivariate energy storage system adopts the working state of tracking and scheduling output;
and a third working state: the multi-element energy storage system adopts the working state of peak clipping and valley filling.
The multi-element energy storage system adopts a smooth power fluctuation state, and specifically comprises the following steps:
step 1.1, monitoring an actual power output signal P of a distributed power generation unit by the microgrid energy management systemtotalObtaining the reference output power P of the distributed power generation unit after passing through a first low-pass filter of a power controllertotal_refActual power P of distributed generation unittotalMinus a reference output power Ptotal_refObtaining the output power reference value P of the multi-element energy storage systemHESS；
Step 1.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 1.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
Step 1.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 1.2sc_refTransmitting the low-frequency compensation power component reference value P of the lithium iron phosphate battery in the step 1.2 to a first energy storage converter in a super capacitor energy storage moduleb_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and monitoring the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 1.4 compensating the reference value P of the power component with the high frequency in step 1.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; all in oneWith the reference value P of the low frequency compensation component in step 1.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter.
In step 1.3, the SOC is measuredbThe values are divided into intervals of which,
0<SOCmin<SOCb<SOCmax<1，
USCis divided into the following intervals,
0<USCmin<0.2USCmax<USC<0.8USCmaxand 0.8USCmax<USC<USCmax；
Is set when PHESS>When 0, the multi-element energy storage system enters a discharge mode, and when P isHESS<And the multi-element energy storage system enters a charging mode at 0.
The multivariate energy storage system adopts a tracking and dispatching output state, and specifically comprises the following steps:
step 2.1, the micro-grid energy management system monitors the actual power P of the distributed power generation unittotalAnd the received power scheduling instruction value P of the grid-connected pointlineCalculating the reference value P of the output power required by the multi-element energy storage systemHESS；
2.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 2.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
Step 2.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 2.2sc_refTransmitting the low-frequency compensation power component reference value P of the lithium iron phosphate battery in the step 2.2 to a first energy storage converter in the super capacitor energy storage moduleb_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and monitoring the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 2.4 compensating the reference value P of the power component with the high frequency in step 2.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; at the same time, with reference value P of the low frequency compensation component in step 2.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter.
The multi-element energy storage system adopts a peak clipping and valley filling working state, and comprises the following specific steps:
step 3.1, the micro-grid energy management system monitors the actually output power signal P of the distributed power generation unittotalAnd the actual output power signal P of the micro-grid loadloadCalculating the reference value P of the output power required by the multi-element energy storage systemHESS；
Step 3.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 3.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
3.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 3.2sc_refTransmitting the phosphorus in the step 3.2 to a first energy storage converter in the super capacitor energy storage moduleLow-frequency compensation power component reference value P of iron lithium batteryb_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and monitoring the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 3.4 compensating the reference value P of the power component with the high frequency in step 3.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; at the same time, with reference value P of the low frequency compensation component in step 3.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter.
The invention discloses a multi-energy storage microgrid grid-connected operation mode coordination control system, which comprises a network interface, a memory and a processor, wherein the network interface is connected with the memory; wherein,
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
the memory to store computer program instructions operable on the processor;
and the processor is used for executing the steps of the multi-element energy storage micro-grid-connected operation mode coordination control method when the computer program instruction is operated.
The invention discloses a multi-element energy storage microgrid grid-connected operation mode coordination control system which comprises a super capacitor energy storage module, a lithium iron phosphate battery energy storage module, an energy storage management station, a distributed power generation unit, a microgrid energy management system and a microgrid load;
the super capacitor energy storage module and the lithium iron phosphate battery energy storage module are connected in parallel to a public alternating current bus of the multi-element energy storage system;
the super capacitor energy storage module comprises a super capacitor and a first energy storage converter controlled by an energy storage management station; the lithium iron phosphate battery energy storage module comprises a lithium iron phosphate battery and a second energy storage converter controlled by an energy storage management station;
the first energy storage converter and the second energy storage converter respectively comprise a first bidirectional DC/AC converter and a second bidirectional DC/AC converter.
The super capacitor energy storage module is connected to a 380V public alternating current bus of the multi-element energy storage system through a first energy storage converter; and the energy storage module of the lithium iron phosphate battery is connected to a 380V public alternating current bus of the multi-element energy storage system through a second energy storage converter.
The 380V public alternating current bus is boosted through a transformer TM1 and then connected to a micro-grid 10kV public alternating current bus.
The first bidirectional DC/AC converter and the second bidirectional DC/AC converter adopt a three-phase full-bridge topological structure, a PWM controller generates corresponding control signals to control a three-phase full bridge, and the PWM controller comprises a three-phase-locked loop, a power controller and a PWM signal generator; the three-phase-locked loop realizes frequency and phase locking through an instantaneous power theory and sends the frequency and the phase locking to a power controller; the power controller is used for realizing voltage and current decoupling control of a reference value and a measured value based on a power control strategy of a voltage and current double closed loop decoupling structure, controlling the first bidirectional DC/AC converter and the second bidirectional DC/AC converter to output corresponding power and generating a voltage modulation wave; and the PWM signal generator compares the voltage modulation wave generated by the power controller with the triangular wave to generate modulation pulse of the three-phase full-bridge converter, and is used for realizing the overall control function.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the grid-connected coordination control method of the multi-element energy storage microgrid, the multi-element energy storage system has three working states according to a grid-connected mode of the microgrid, the first working state is a smooth power fluctuation working state in the grid-connected operation mode, the second working state is a tracking and dispatching output working state in the grid-connected operation mode, and the third working state is a peak clipping and valley filling working state in an island operation mode, so that the requirements of the microgrid in different operation states are met.
2. According to the invention, a super-capacitor energy storage module and a lithium iron phosphate battery energy storage module in the multi-element energy storage system are respectively connected to a 380V public alternating current bus of the energy storage system through a bidirectional DC/AC converter, and are connected to a 10kV public alternating current bus of a microgrid after being boosted by a transformer.
3. The invention adopts the low-pass filter in the energy storage management station to distribute the power output of two energy storage modules in the multi-element energy storage system, the super-capacitor energy storage module compensates the high-frequency fluctuation part in the total power of the multi-element energy storage system, and the lithium iron phosphate battery energy storage module compensates the low-frequency part in the total power of the multi-element energy storage system, so that the characteristics of high power density of a super capacitor and high energy density of the lithium iron phosphate battery can be exerted.
4. The power control strategy based on the double closed-loop decoupling structure can control the bidirectional DC/AC converter to output corresponding power, and the control structure and the control strategy can meet the output requirement of a micro-grid on an energy storage system.
Drawings
FIG. 1 is a schematic diagram of a typical microgrid and a topology of a multi-element energy storage system in the microgrid according to the present invention;
FIG. 2 is a topological structure of a super capacitor energy storage module converter involved in the present invention;
fig. 3 is a topological structure of a lithium iron phosphate battery energy storage module converter related to the present invention;
FIG. 4 is a schematic diagram of the power reference values for the modes of operation involved in the present invention;
FIG. 5 is a schematic diagram of the operating mode two power reference values involved in the present invention;
FIG. 6 is a schematic diagram of three power reference values for the modes of operation involved in the present invention;
FIG. 7 is a flow chart of a coordinated control of a multi-element energy storage system involved in the present invention;
fig. 8 is a schematic block diagram of a power control strategy involved in the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In order to realize the diversity of the operation requirements of the micro-grid and simultaneously consider that the super capacitor has the advantage of high power density and the lithium iron phosphate battery has the advantage of high energy density, a multi-element energy storage system adopting the super capacitor and the lithium iron phosphate battery is provided, the high-frequency power fluctuation with short time scale and small power amplitude is compensated by the power type energy storage super capacitor, and the low-frequency power fluctuation with long time scale and large power amplitude is compensated by the energy type energy storage lithium iron phosphate battery. Because the micro-grid has various requirements on the working state of the energy storage system in a grid-connected mode, a multi-element energy storage system control strategy needs to be designed to ensure the coordination control of different energy storage modules of the energy storage system.
In the embodiment, the microgrid is composed of a distributed power generation unit consisting of a wind power generation system and a photovoltaic power generation system, a microgrid load, a multi-element energy storage system and a microgrid energy management system, a 10kV grid-connected switch cabinet is adopted to connect a microgrid 10kV public alternating current bus with a large power grid, as shown in fig. 1, the microgrid load is connected to the microgrid 10kV public alternating current bus through a transmission line and a transformer, and the microgrid energy management system is responsible for selection of a microgrid operation mode and control of an energy storage management station; the multi-element energy storage system consists of a super-capacitor energy storage module, a lithium iron phosphate battery energy storage module and an energy storage management station; the energy storage management station controls the energy storage converter according to an operation mode instruction of the micro-grid energy management system and a state feedback instruction of the energy storage module, so that the working state and the switching time sequence of the super capacitor and the lithium iron phosphate battery are controlled to meet the operation requirement of the micro-grid and fully exert the advantages of various types of energy storage:
when the micro-grid is in grid-connected operation, the multi-element energy storage system adopts the following working state I, working state II or working state III:
the working state I is as follows: the multi-element energy storage system adopts a working state of smooth power fluctuation;
and a second working state: the multivariate energy storage system adopts the working state of tracking and scheduling output;
and a third working state: the multi-element energy storage system adopts the working state of peak clipping and valley filling;
the power output of the super capacitor energy storage module and the power output of the lithium iron phosphate battery energy storage module in the multi-element energy storage system are distributed and scheduled by the energy storage management station, the super capacitor energy storage module outputs power with short time scale and high frequency fluctuation, the lithium iron phosphate battery energy storage module outputs power with long time scale and low frequency fluctuation, and the output of each energy storage module can meet the requirements of a micro-grid on voltage, frequency or power according to different control strategies.
In this example, the super capacitor energy storage module is configured to: the super-capacitor energy storage module is connected to a 380V public alternating current bus of an energy storage system through a first energy storage converter, the first energy storage converter is composed of a first bidirectional DC/AC converter, the first bidirectional DC/AC converter is of a three-phase bridge structure, the first energy storage converter is controlled by an energy storage management station, and the energy storage management station receives a control instruction of a micro-grid energy management system and a state feedback instruction of the super-capacitor energy storage module;
the energy storage module of the lithium iron phosphate battery is configured as follows: the lithium iron phosphate battery is connected to a 380V public alternating current bus of the energy storage system through a second energy storage converter, the second energy storage converter is composed of a second bidirectional DC/AC converter, the second bidirectional DC/AC converter is in a three-phase full-bridge structure, the second energy storage converter is controlled by an energy storage management station, and the energy storage management station receives a control instruction of the microgrid energy management system and a state feedback instruction of an energy storage module of the lithium iron phosphate battery;
and each energy storage module in the multi-element energy storage system is respectively composed of an energy storage converter consisting of a bidirectional DC/AC converter to control the power output of the super capacitor and the lithium iron phosphate battery, so that the diversity requirement of the operation of the micro-grid is realized. The bidirectional DC/AC converter adopts a power control strategy or Vf control strategy to realize that the energy storage module outputs power or voltage and frequency meeting the requirements of the microgrid.
In a first working state, a first bidirectional DC/AC converter in a super capacitor energy storage module and a second bidirectional DC/AC converter in a lithium iron phosphate battery energy storage module are arranged to adopt a power control strategy, and the first working state is carried out according to the following steps:
step 1.1, the microgrid energy management system selects a first operation mode and detects an actual power output signal P of a distributed power generation unittotalObtaining the reference output power P of the distributed power generation unit after filtering through the first low-pass filtertotal_refActual power output P of distributed power generation unittotalMinus a reference output power Ptotal_refObtaining the reference output power P of the multi-element energy storage systemHESSThen the micro-grid energy management system outputs the reference output power PHESSThe data are transmitted to an energy storage management station, and the specific calculation process is shown in formulas (1) and (2);
step 1.2, the energy storage management station utilizes a second low-pass filter to obtain the output power reference value P of the multi-element energy storage system in the step 1.1HESSDecomposing to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining a reference value P of the high-frequency compensation power component of the super capacitorsc_refThe specific calculation process is shown in formulas (3) and (4);
step 13, the energy storage management station compensates the reference value P of the high-frequency compensation power component of the super capacitor in the step 1.2sc_refTransmitting the low-frequency compensation power component reference value P to a first energy storage converter in a super capacitor energy storage module and simultaneously compensating the low-frequency compensation power component reference value P of the lithium iron phosphate battery in 1.2b_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and simultaneously detecting the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd lithium iron phosphate battery energy storage module SOCbThe value controls the switching and charging and discharging operations of the energy storage module;
step 1.4, the bidirectional DC/AC adopts power control to compensate the power component reference value P with high frequency in step 1.3sc_refTarget power signal as power control strategy employed
Generating a PWM control signal to control the power output of the first bidirectional DC/AC converter; at the same time, with reference value P of the low frequency compensation component in step 1.3b_refTarget power signal as power control strategy employed
Generating a PWM control signal to control the power output of the second bidirectional DC/AC converter;
in the second working state, a first bidirectional DC/AC converter in the super capacitor energy storage module and a second bidirectional DC/AC converter in the lithium iron phosphate battery energy storage module are both arranged to adopt a power control strategy, and the second working state is carried out according to the following steps:
step 2.1, the micro-grid energy management system generates power according to the output power P of the distributed power generation units in the micro-gridtotalAnd the received power scheduling instruction value P of the grid-connected pointlineCalculating the reference value P of the output power required by the multi-element energy storage system according to the formula (1)HESS；
PHESS＝Pline-Ptotal (5)
Step 2.2, step 2.3 and step 2.4 are respectively the same as step 1.2, step 1.3 and step 1.4 in the control mode one;
in the third working state, a first bidirectional DC/AC converter in the super capacitor energy storage module and a second bidirectional DC/AC converter in the lithium iron phosphate battery energy storage module are both arranged to adopt a power control strategy, and the third working state is carried out according to the following steps:
step 3.1, the micro-grid energy management system monitors the actual output power signal P of the distributed power generation unittotalAnd a microgrid load actual output power signal PloadCalculating the reference value P of the output power required by the multi-element energy storage system according to the formula (6)HESS；
PHESS＝Pload-Ptotal (6)
Step 3.2, step 3.3 and step 3.4 are the same as step 1.2 and steps 1.3 and 1.4, respectively, in control mode one.
The invention discloses a multi-energy storage microgrid grid-connected operation mode coordination control system, which comprises a network interface, a memory and a processor, wherein the network interface is connected with the memory; wherein,
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
a memory for storing computer program instructions executable on the processor;
and the processor is used for executing the steps of the multi-element energy storage micro-grid-connected operation mode coordination control method when the computer program instruction is operated.
In this embodiment, the structural topology of the first bidirectional DC/AC converter of the first energy storage converter in the super capacitor energy storage module is shown in fig. 2.
In fig. 2, the first bidirectional DC/AC converter adopts a three-phase full-bridge topology structure, the PWM controller 1 generates corresponding control signals to control a three-phase full bridge, the PWM controller 1 is composed of a three-phase-locked loop 1, a power controller 1 and a PWM signal generator 1, a power control strategy is selected in the first working state, and a target power signal of the power control strategy is selected
From the received high-frequency power fluctuation signal Psc_refDetermining the voltage U at the AC side of a first bidirectional DC/AC converter collected by a three-phase-locked loop 1 in a PWM controller 11Phase information of (a);
in this embodiment, the structural topology of the second bidirectional DC/AC converter of the second energy storage converter in the lithium iron phosphate battery energy storage module is shown in fig. 3. The topology and control strategy of the second bi-directional DC/AC converter in fig. 3 is exactly the same as the first bi-directional DC/AC converter in fig. 2;
in fig. 3, the second bidirectional DC/AC converter adopts a three-phase full-bridge topology structure, the PWM controller 2 generates corresponding control signals to control a three-phase full bridge, the PWM controller 2 is composed of a three-phase-locked loop 2, a power controller 2 and a PWM signal generator 2, and the power control strategy and the target power signal of the power control strategy are selected in the first working state
From the received low-frequency power fluctuation signal Pb_refDetermining the voltage U at the AC side of the second bidirectional DC/AC converter collected by the three-phase-locked loop 2 in the PWM controller 22The phase information of (1).
Referring to FIG. 4, detecting the actual power output signal P of the distributed generation unittotalObtaining the reference output power P of the distributed power generation unit after filtering through the first low-pass filtertotal_refActual power output P of distributed power generation unittotalMinus a reference output power Ptotal_refObtaining the reference output power P of the multi-element energy storage systemHESSUsing a second low-pass filter to reference the output power P of the multi-element energy storage systemHESSDecomposing to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining a reference value P of the high-frequency compensation power component of the super capacitorsc_ref。
Referring to fig. 5, according to the output power P of the distributed generation unit in the microgridtotalAnd the received power scheduling instruction value P of the grid-connected pointlineAnd calculating to obtain the output required by the multi-element energy storage systemOutput power reference value PHESSUsing a second low-pass filter to reference the output power P of the multi-element energy storage systemHESSDecomposing to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining a reference value P of the high-frequency compensation power component of the super capacitorsc_ref。
Referring to fig. 6, the actual output power signal P of the distributed power generation unit is monitoredtotalAnd a microgrid load actual output power signal PloadCalculating the reference value P of the output power required by the multi-element energy storage systemHESSUsing a second low-pass filter to reference the output power P of the multi-element energy storage systemHESSDecomposing to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining a reference value P of the high-frequency compensation power component of the super capacitorsc_ref。
Fig. 7 shows a flow chart of coordination control of a multi-element energy storage system, which is used for monitoring the state of charge (SOC) of a lithium iron phosphate battery in real timebAnd terminal voltage U of the super capacitorSCWill SOCbIs divided into the following intervals, 0<SOCmin<SOCb<SOCmax<1，USCIs divided into the following intervals, 0<USCmin<0.2USCmax<USC<0.8USCmaxAnd 0.8USCmax<USC<USCmax. Is set when PHESS>When 0, the multi-element energy storage system enters a discharge mode, and when P isHESS<And (3) when the multi-element energy storage system enters a charging mode, the following process steps are adopted:
step 1: judging the output power reference instruction value PHESSIf P isHESSIf not less than 0, the multi-element energy storage system enters a to-be-discharged mode, and if P is greater than or equal to 0HESSIf the value is 0, the multi-element energy storage system is in a standby state, and if P is equal to the valueHESS>0, the multi-element energy storage system of the micro-grid enters a discharging state, the step 2 is carried out, and if P is reachedHESS<0, the charging state of the multi-element energy storage system of the microgrid is switched to a step 4;
step 2: in the discharge state, monitoring and comparingTerminal voltage U of super capacitorSCAnd 0.2USCmaxIf Usc is not less than 0.2UCmaxThen the output power reference value P of the multi-element energy storage system of the micro-gridHESSFirst compensated by supercapacitor discharge until USC<0.2UCmaxWhen the super capacitor energy storage module is in over-discharge protection, the energy storage management station sends a locking signal to the first energy storage converter, the super capacitor energy storage module is cut off, and the step 3 is carried out;
and step 3: monitoring and comparing SOC of lithium iron phosphate batterybAnd SOCminMagnitude relation, if SOCb≥SOCminThen the lithium iron phosphate battery compensates the insufficient part of the multi-element energy storage system power compensation in the step 2, the terminal voltage of the stage capacitor and the state of charge of the lithium iron phosphate battery are monitored, and if the SOC is not satisfied, the SOC is judged to be insufficientb<SOCminIf so, the energy storage management station sends a locking signal to the second energy storage converter to cut off the energy storage module of the lithium iron phosphate battery so as to realize over-discharge protection;
and 4, step 4: in a charging state, the terminal voltage Usc of the super capacitor is monitored and compared with 0.8USCmaxIf U is concernedSC<0.8USCmaxThe super capacitor is charged first to absorb the power generated by the distributed power generation unit until the power reaches USC≥0.8USCmaxWhen the super capacitor energy storage module is in an over-charge state, the energy storage management station sends a locking signal to the first energy storage converter, and the super capacitor energy storage module is cut off, so that the step 5 is carried out;
and 5: monitoring and comparing SOC of lithium iron phosphate batterybAnd SOCmaxMagnitude relation, if SOCb≤SOCmaxThen the lithium iron phosphate battery absorbs the surplus part of the output power of the distributed power generation unit in the step 4, the terminal voltage of the secondary capacitor and the state of charge of the lithium iron phosphate battery are monitored, and if the SOC is not reached, the lithium iron phosphate battery absorbs the surplus part of the output power of the distributed power generation unit in the step 4, and the voltage of theb>SOCmaxAnd when the second energy storage converter is used, the energy storage management station sends a locking signal to the second energy storage converter, and the lithium iron phosphate battery energy storage module is cut off, so that overcharge protection is realized.
Power control strategy A schematic diagram is shown in FIG. 8, Pref，QrefActive power and reactive power reference values respectively; omega is electricityA network frequency; i isdref，IqrefRespectively obtaining d-axis and q-axis current reference values obtained by power decoupling; u shaped，UqThe d-axis and q-axis modulation voltage signals obtained by current loop control are respectively. When the bidirectional DC/AC converter is put into operation, the output voltage of the bidirectional DC/AC converter is 380V of the public alternating current bus voltage of the energy storage system, and the decoupling control of active power and reactive power is realized by adjusting the output current of the bidirectional DC/AC converter. Decoupling is carried out through active power and reactive power to obtain a reference value of the filtering inductive current at the outlet of the bidirectional DC/AC converter, the reference value is compared with the inductive current actually measured, and the obtained error signal passes through the instantaneous current loop PI controller to obtain a modulation voltage signal of the bidirectional DC/AC converter.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (2)
1. A control method of a multi-energy-storage microgrid grid-connected operation mode coordination control system is characterized by comprising the following steps:
the multi-energy-storage microgrid grid-connected operation mode coordination control system comprises a super-capacitor energy storage module, a lithium iron phosphate battery energy storage module, an energy storage management station, a distributed power generation unit, a microgrid energy management system and a microgrid load;
the super capacitor energy storage module and the lithium iron phosphate battery energy storage module are connected in parallel to a public alternating current bus of the multi-element energy storage system;
the super capacitor energy storage module comprises a super capacitor and a first energy storage converter controlled by an energy storage management station; the lithium iron phosphate battery energy storage module comprises a lithium iron phosphate battery and a second energy storage converter controlled by an energy storage management station;
the first energy storage converter and the second energy storage converter respectively comprise a first bidirectional DC/AC converter and a second bidirectional DC/AC converter;
the super capacitor energy storage module is connected to a 380V public alternating current bus of the multi-element energy storage system through a first energy storage converter; the energy storage module of the lithium iron phosphate battery is connected to a 380V public alternating current bus of the multi-element energy storage system through a second energy storage converter;
the 380V public alternating current bus is boosted by a transformer TM1 and then is connected to a micro-grid 10kV public alternating current bus;
the first bidirectional DC/AC converter and the second bidirectional DC/AC converter adopt a three-phase full-bridge topological structure, a PWM controller generates corresponding control signals to control a three-phase full bridge, and the PWM controller comprises a three-phase-locked loop, a power controller and a PWM signal generator; the three-phase-locked loop realizes frequency and phase locking through an instantaneous power theory and sends the frequency and the phase locking to a power controller; the power controller is used for realizing voltage and current decoupling control of a reference value and a measured value based on a power control strategy of a voltage and current double closed loop decoupling structure, controlling the first bidirectional DC/AC converter and the second bidirectional DC/AC converter to output corresponding power and generating a voltage modulation wave; the PWM signal generator compares the voltage modulation wave generated by the power controller with the triangular wave to generate a modulation pulse of the three-phase full-bridge converter, and the modulation pulse is used for realizing the integral control function;
the method comprises the steps that an energy storage management station receives a control instruction of a micro-grid energy management system and state feedback instructions of a super capacitor energy storage module and a lithium iron phosphate battery energy storage module, controls a first energy storage converter and a second energy storage converter, and controls a super capacitor and a lithium iron phosphate battery to work in any one of the following working states;
the working state I is as follows: the multi-element energy storage system adopts a working state of smooth power fluctuation;
and a second working state: the multivariate energy storage system adopts the working state of tracking and scheduling output;
and a third working state: the multi-element energy storage system adopts the working state of peak clipping and valley filling;
the multi-element energy storage system adopts a smooth power fluctuation state, and specifically comprises the following steps:
step 1.1, monitoring an actual power output signal P of a distributed power generation unit by the microgrid energy management systemtotalObtaining the reference output power P of the distributed power generation unit after passing through a first low-pass filter of a power controllertotal_refActual power P of distributed generation unittotalMinus a reference output power Ptotal_refObtaining the output power reference value P of the multi-element energy storage systemHESS；
Step 1.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 1.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
Step 1.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 1.2sc_refTransmitting the low-frequency compensation power component reference value P of the lithium iron phosphate battery in the step 1.2 to a first energy storage converter in a super capacitor energy storage moduleb_refTo iron phosphateA second energy storage converter in the lithium battery energy storage module, and the energy storage management station monitors the voltage U of the super capacitor energy storage modulescAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 1.4 compensating the reference value P of the power component with the high frequency in step 1.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; and compensating the reference value P of the component with the low frequency in step 1.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter;
in step 1.3, the SOC is measuredbThe values are divided into intervals of which,
0<SOCmin<SOCb<SOCmax<1，
USCis divided into the following intervals,
0<USCmin<0.2USCmax<USC<0.8USCmaxand 0.8USCmax<USC<USCmax；
Is set when PHESS>When 0, the multi-element energy storage system enters a discharge mode, and when P isHESS<When 0, the multi-element energy storage system enters a charging mode;
the multivariate energy storage system adopts a tracking and dispatching output state, and specifically comprises the following steps:
step 2.1, the micro-grid energy management system monitors the actual power P of the distributed power generation unittotalAnd the received power scheduling instruction value P of the grid-connected pointlineCalculating the reference value P of the output power required by the multi-element energy storage systemHESS；
PHESS＝Pline-Ptotal (5)
2.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 2.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
Step 2.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 2.2sc_refTransmitting the low-frequency compensation power component reference value P of the lithium iron phosphate battery in the step 2.2 to a first energy storage converter in the super capacitor energy storage moduleb_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and monitoring the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 2.4 compensating the reference value P of the power component with the high frequency in step 2.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; at the same time, with reference value P of the low frequency compensation component in step 2.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter;
the multi-element energy storage system adopts a peak clipping and valley filling working state, and comprises the following specific steps:
step 3.1, the micro-grid energy management system monitors the actual output of the distributed power generation unitsPower signal PtotalAnd the actual output power signal P of the micro-grid loadloadCalculating the reference value P of the output power required by the multi-element energy storage systemHESS；
PHESS＝Pload-Ptotal (6)
Step 3.2, the energy storage management station utilizes a second low-pass filter of the power controller to convert the output power reference value P of the multi-element energy storage system in the step 3.1 into a reference valueHESSSeparating to obtain a reference value P of the low-frequency compensation power component of the lithium iron phosphate batteryb_refReuse PHESSMinus Pb_refObtaining the high-frequency compensation power component reference value P of the super capacitorsc_ref；
3.3, the energy storage management station enables the high-frequency compensation power component reference value P of the super capacitor in the step 3.2sc_refTransmitting the low-frequency compensation power component reference value P of the lithium iron phosphate battery in the step 3.2 to a first energy storage converter in the super capacitor energy storage moduleb_refTransmitting the voltage to a second energy storage converter in the energy storage module of the lithium iron phosphate battery, and monitoring the voltage U of the super capacitor energy storage module by the energy storage management stationscAnd SOC of lithium iron phosphate battery energy storage modulebThe value controls the switching and charging and discharging operations of the super capacitor energy storage module and the lithium iron phosphate battery energy storage module;
step 3.4 compensating the reference value P of the power component with the high frequency in step 3.3sc_refTarget active power signal as power control strategy employed
Controlling the power output of the first bi-directional DC/AC converter; at the same time, with reference value P of the low frequency compensation component in step 3.3b_refTarget active power signal as power control strategy employed
Controlling the power output of the second bidirectional DC/AC converter;
real-time monitoringSOC of lithium iron phosphate batterybAnd terminal voltage U of the super capacitorSCWill SOCbIs divided into the following intervals, 0<SOCmin<SOCb<SOCmax<1，USCIs divided into the following intervals, 0<USCmin<0.2USCmax<USC<0.8USCmaxAnd 0.8USCmax<USC<UScmax(ii) a Is set when PHESS>When 0, the multi-element energy storage system enters a discharge mode, and when P isHESS<And (3) when the multi-element energy storage system enters a charging mode, the following process steps are adopted:
step 1: judging the output power reference instruction value PHESSIf P isHESSIf not less than 0, the multi-element energy storage system enters a to-be-discharged mode, and if P is greater than or equal to 0HESSIf the value is 0, the multi-element energy storage system is in a standby state, and if P is equal to the valueHESS>0, the multi-element energy storage system of the micro-grid enters a discharging state, the step 2 is carried out, and if P is reachedHESS<0, the charging state of the multi-element energy storage system of the microgrid is switched to a step 4;
step 2: in the discharge state, the terminal voltage U of the super capacitor is monitored and comparedSCAnd 0.2USCmaxIf Usc is not less than 0.2UCmaxThen the output power reference value P of the multi-element energy storage system of the micro-gridHESSFirst compensated by supercapacitor discharge until USC<0.2UCmaxWhen the super capacitor energy storage module is in over-discharge protection, the energy storage management station sends a locking signal to the first energy storage converter, the super capacitor energy storage module is cut off, and the step 3 is carried out;
and step 3: monitoring and comparing SOC of lithium iron phosphate batterybAnd SOCminMagnitude relation, if SOCb≥SOCminThen the lithium iron phosphate battery compensates the insufficient part of the multi-element energy storage system power compensation in the step 2, the terminal voltage of the stage capacitor and the state of charge of the lithium iron phosphate battery are monitored, and if the SOC is not satisfied, the SOC is judged to be insufficientb＜SOCminIf so, the energy storage management station sends a locking signal to the second energy storage converter to cut off the energy storage module of the lithium iron phosphate battery so as to realize over-discharge protection;
and 4, step 4: in the state of charge, monitoring and comparingHigher than the super capacitor terminal voltage Usc and 0.8USCmaxIf U is concernedSC<0.8USCmaxThe super capacitor is charged first to absorb the power generated by the distributed power generation unit until the power reaches USC≥0.8USCmaxWhen the super capacitor energy storage module is in an over-charge state, the energy storage management station sends a locking signal to the first energy storage converter, and the super capacitor energy storage module is cut off, so that the step 5 is carried out;
and 5: monitoring and comparing SOC of lithium iron phosphate batterybAnd SOCmaxMagnitude relation, if SOCb≤SOCmaxThen the lithium iron phosphate battery absorbs the surplus part of the output power of the distributed power generation unit in the step 4, the terminal voltage of the secondary capacitor and the state of charge of the lithium iron phosphate battery are monitored, and if the SOC is not reached, the lithium iron phosphate battery absorbs the surplus part of the output power of the distributed power generation unit in the step 4, and the voltage of theb＞SOCmaxAnd when the second energy storage converter is used, the energy storage management station sends a locking signal to the second energy storage converter, and the lithium iron phosphate battery energy storage module is cut off, so that overcharge protection is realized.
2. The coordinated control system for the grid-connected operation mode of the multi-element energy storage microgrid is characterized by comprising a network interface, a memory and a processor; wherein,
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
the memory to store computer program instructions operable on the processor;
the processor is used for executing the steps of the control method of the multi-energy storage micro-grid-connected operation mode coordination control system according to claim 1 when the computer program instructions are executed.
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