CN108933451B - Microgrid system, microgrid central controller thereof and power distribution control method - Google Patents
Microgrid system, microgrid central controller thereof and power distribution control method Download PDFInfo
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- CN108933451B CN108933451B CN201811049005.8A CN201811049005A CN108933451B CN 108933451 B CN108933451 B CN 108933451B CN 201811049005 A CN201811049005 A CN 201811049005A CN 108933451 B CN108933451 B CN 108933451B
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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
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- 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
Abstract
The invention provides a micro-grid system, a micro-grid central controller and a power distribution control method thereof.A sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current moment is determined according to the period of the current moment and the grid-connected point countercurrent condition at the current moment, and the weighted average value of the residual electric quantity of each sub energy storage system is obtained by calculation; determining a control strategy for circularly distributing the total power to be stored in a stable state to each sub energy storage system according to the corresponding relation between the residual electric quantity and the weighted average value according to the time period to which the current moment belongs and the grid-connected point countercurrent condition of the current moment, and generating and issuing a control instruction for each sub energy storage system according to the control strategy; and then through the cooperative peak clipping and valley filling control on the plurality of sub energy storage systems, the balance control on the residual electric quantity of each sub energy storage system is realized.
Description
Technical Field
The invention relates to the technical field of microgrid control, in particular to a microgrid system, a microgrid central controller of the microgrid system and a power distribution control method.
Background
In recent years, micro-grid systems are widely used, and meanwhile, micro-grid control technology is also deeply developed. The peak clipping and valley filling strategy is an important control strategy in the microgrid control technology, and can control the discharge of the sub energy storage systems in the microgrid system in the peak power consumption period and control the charge of the sub energy storage systems in the microgrid system in the valley power consumption period, so that the microgrid system can realize economic operation. However, most of the existing peak clipping and valley filling strategies only aim at controlling a peak clipping and valley filling operation mode of a single sub energy storage system in a microgrid system, and do not aim at a cooperative peak clipping and valley filling control strategy of a plurality of sub energy storage systems.
Disclosure of Invention
The invention provides a micro-grid system, a micro-grid central controller and a power distribution control method thereof, and aims to realize a cooperative peak clipping and valley filling control strategy for a multi-sub energy storage system.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
a power distribution control method of a micro-grid system is applied to a micro-grid central controller of the micro-grid system and comprises the following steps:
determining each sub energy storage system meeting the load shifting condition of the microgrid at the current moment according to the time period to which the current moment belongs and the grid-connected point countercurrent condition at the current moment, and calculating to obtain a weighted average value of the residual electric quantity of each sub energy storage system;
determining a control strategy for circularly distributing the total power to be stored in a stable state to each sub energy storage system according to the time interval to which the current moment belongs and the grid-connected point countercurrent condition at the current moment; the corresponding relation is the relation between the corresponding residual capacity and the weighted average value;
and generating and issuing a control instruction for each sub energy storage system according to the control strategy so as to realize the balance control of the residual electric quantity of each sub energy storage system.
Preferably, each sub energy storage system which meets the microgrid peak clipping and valley filling condition at the current time is determined according to the time period to which the current time belongs and the grid-connected point countercurrent condition at the current time, and the method comprises the following steps:
if the time period of the current moment is the peak time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity larger than the protection lower limit;
if the time period of the current moment is a valley time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity smaller than the protection upper limit;
and if the grid-connected point countercurrent condition at the current moment is the occurrence of countercurrent, under the condition that the time period of the current moment belongs to any time period, all the sub energy storage systems meeting the microgrid peak clipping and valley filling conditions at the current moment are all sub energy storage systems with the residual electric quantity smaller than the protection upper limit.
Preferably, the determining, according to the time period to which the current time belongs and the grid-connected point countercurrent situation at the current time, a control strategy for circularly allocating the total power to be stored in the stable state to each of the sub energy storage systems according to the corresponding relationship includes:
if the time period of the current moment is the peak time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, the total power to be stored and stabilized is the total power to be stored and discharged, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation;
if the time period of the current moment is a valley time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, the total power of the energy storage to be stabilized is the total power of the energy storage to be charged stabilized, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
if the grid-connected point countercurrent situation at the current moment is the occurrence of countercurrent, and the time period to which the current moment belongs is any time period, the total power of the energy storage to-be-stabilized state is the total power of the energy storage to-be-charged state, and the control strategy is as follows: and circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation.
Preferably, the determining a control strategy for circularly distributing the total power to be stored in the steady state to each of the sub energy storage systems according to the corresponding relationship includes:
respectively subtracting the difference value of the residual electric quantity of each sub energy storage system and the total power to be stored in a stable state according to the weighted average value, and obtaining the primary distribution power of each sub energy storage system through closed-loop proportional-integral adjustment or open-loop proportional adjustment;
calculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each primary distribution power;
distributing the residual power according to the weight of the difference value obtained by subtracting the weighted average value from the residual electric quantity of each sub energy storage system to obtain a residual power distribution value of each sub energy storage system;
according to each residual power distribution value, correcting the corresponding primary distribution power to obtain the secondary distribution power of each sub energy storage system;
recalculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each redistributed power; and if the residual power is not zero, continuously distributing the residual power until the calculated residual power is zero or the sub energy storage systems do not meet the micro-grid peak clipping and valley filling conditions any more.
Preferably, each sub energy storage system satisfying the microgrid peak clipping and valley filling condition at the current time is determined according to the time period to which the current time belongs and the grid-connected point countercurrent condition at the current time, and the method further includes:
if the time period to which the current time belongs is the ordinary time period and the grid-connected point countercurrent situation at the current time is no countercurrent, determining the next time period to which the current time belongs according to the preset time period division standard;
if the next time period of the current time is the peak time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is a sub energy storage system with the residual electric quantity smaller than the protection upper limit;
and if the next time period of the time period to which the current time belongs is the valley time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is each sub energy storage system with the residual electric quantity greater than the protection lower limit.
Preferably, the method further includes the following steps of determining a control strategy for circularly distributing the total power of the energy storage expected steady state to each sub energy storage system according to the corresponding relationship according to the time period to which the current time belongs and the grid-connected point countercurrent condition of the current time, and further including:
if the next time period of the current moment is the peak time period, the total power of the energy storage to be steady state is the total power of the energy storage to be charged steady state, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
if the next time interval of the current moment is the valley time interval, the total power of the energy storage to be steady state is the total power of the energy storage to be discharged to be steady state, and the control strategy is as follows: and circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation.
Preferably, the determining a control strategy for circularly distributing the total power to be stored in the steady state to each of the sub energy storage systems according to the corresponding relationship includes:
respectively subtracting the difference value of the residual electric quantity of each sub energy storage system and the total power to be stabilized in the energy storage state according to the weighted average value, and obtaining the primary distribution power of each sub energy storage system through closed loop proportional integral adjustment or open loop proportional adjustment;
calculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each primary distribution power;
distributing the residual power according to the weight of the difference value obtained by subtracting the weighted average value from the residual electric quantity of each sub energy storage system to obtain a residual power distribution value of each sub energy storage system;
according to each residual power distribution value, correcting the corresponding primary distribution power to obtain the secondary distribution power of each sub energy storage system;
recalculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each redistributed power; and if the residual power is not zero, the residual power is distributed continuously until each sub energy storage system does not meet the load shifting condition of the microgrid any more.
Preferably, under the closed-loop proportional-integral regulation, the calculation formula of the primary distributed power is as follows:
ΔP i ＝k(SOC aver -SOC i )；
wherein, P i For the initial allocation of sub-energy-storage systems numbered iPower, n is the number of the sub energy storage systems of each sub energy storage system, P General assembly For the total power to be stabilized, Δ P i The power to be adjusted for the sub-energy storage system numbered i, k is the regulation factor, SOC aver As said weighted average, SOC i The remaining capacity of the sub energy storage system is numbered i.
Preferably, the calculation formula of the weighted average is:
therein, SOC aver Is the weighted average, E i Rated capacity, SOC, of sub-energy storage system numbered i i The number of the residual electric quantity of the sub energy storage system is i, and n is the number of the sub energy storage systems of each sub energy storage system.
A microgrid central controller of a microgrid system comprises: a memory and a processor;
the processor is used for executing all steps stored in the memory;
the steps stored in the memory comprise any one of the power distribution control methods of the microgrid system.
A microgrid system comprising: the microgrid system comprises at least one local controller, a plurality of sub-microgrids and a microgrid central controller of the microgrid system;
the microgrid central controller is in communication connection with a grid-connected point of the microgrid system;
the local controller is in communication connection with each sub-microgrid with the same sub-microgrid grid-connected point;
and the micro-grid central controller realizes communication with the local controller, the micro-grid master station, the communication server and the real-time server through an optical fiber ring network.
Preferably, the method further comprises the following steps: at least one transformer;
and each sub-microgrid grid-connected point is connected to the power grid through a corresponding transformer or directly connected to the power grid.
The power distribution control method of the microgrid system provided by the invention comprises the steps of determining each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment according to the time period to which the current moment belongs and the grid-connected point countercurrent condition at the current moment, and calculating to obtain the weighted average value of the residual electric quantity of each sub energy storage system; determining a control strategy for circularly distributing the total power to be stored in a stable state to each sub energy storage system according to the corresponding relation between the residual electric quantity and the weighted average value according to the time period of the current moment and the grid-connected point countercurrent condition of the current moment, and generating and issuing a control instruction for each sub energy storage system according to the control strategy; and then through the cooperative peak clipping and valley filling control on the plurality of sub energy storage systems, the balance control on the residual electric quantity of each sub energy storage system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a power distribution control method of a microgrid system provided by an embodiment of the present invention;
FIG. 2 is a logic diagram of a power distribution control method of a microgrid system according to an embodiment of the present invention;
fig. 3 is a logic block diagram of a power distribution control method of a microgrid system according to an embodiment of the present invention;
fig. 4 is another logic block diagram of a power distribution control method of a microgrid system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a microgrid system provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a power distribution control method of a micro-grid system, which aims to realize a cooperative peak clipping and valley filling control strategy for a multi-sub energy storage system.
The power distribution control method for the micro-grid system is applied to a micro-grid central controller of the micro-grid system, and specifically, referring to fig. 1, the power distribution control method for the micro-grid system includes:
s101, determining each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current moment according to the time period to which the current moment belongs and the grid-connected point countercurrent condition at the current moment, and calculating to obtain a weighted average value of the residual electric quantity of each sub energy storage system;
specifically, the time interval to which the current time belongs can be determined according to a preset time interval division standard; the preset time interval division standard may be determined according to the actual application environment by combining with the local time-of-use price policy, and each cycle may be divided into three time intervals of peak, valley and average, or four time intervals of peak, valley and average, which is not specifically limited herein and is within the protection scope of the present application.
For the grid-connected point countercurrent condition at the current moment, the grid-connected point countercurrent condition can be determined according to the grid-connected point power detection information of the micro-grid system at the current moment; the grid-connected point power detection information of the micro-grid system at the current moment can adopt the grid-connected point active output P to determine the grid-connected point countercurrent condition in practical application; for example, if P is greater than 0, it indicates that the microgrid system has no countercurrent at the current moment; and P <0, indicating that the micro-grid system generates the reverse current at the current moment.
In practical application, the microgrid peak clipping and valley filling condition may be as follows: the peak period residual capacity is greater than the protection lower limit SOCmin, or the valley period residual capacity is less than the protection upper limit SOCmax, or the residual capacity is less than the protection upper limit SOCmax when the reverse flow occurs. Wherein SOCmax > SOCmin, and the upper protection limit SOCmax and the lower protection limit SOCmin are safety protection values preset by the system for the sub energy storage system, the specific value can be determined according to the application environment, and is not limited herein, and is within the protection scope of the present application.
For each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions, the micro-grid central controller can number the sub energy storage systems respectively, and in the process of peak clipping and valley filling, if a certain sub energy storage system does not meet the micro-grid peak clipping and valley filling conditions any more, the micro-grid central controller can number the rest sub energy storage systems again. For example, the number of the sub energy storage systems is i (where 1 ≦ i ≦ n, and n is the number of the sub energy storage systems satisfying the peak clipping and valley filling conditions of the microgrid), and the remaining capacity of the sub energy storage systems is SOC i Rated capacity of E i Then weighted average value SOC aver The calculation formula of (2) is as follows:
s102, determining a control strategy for circularly distributing the total power to be stored in a stable state to each sub energy storage system according to the time interval to which the current moment belongs and the grid-connected point countercurrent condition of the current moment;
the corresponding relation is the relation between the corresponding residual capacity and the weighted average value;
referring to fig. 2, in the peak time period and with P >0, the microgrid central controller may control each sub energy storage system having the remaining energy amount greater than the lower protection limit to discharge, where the total power of the energy storage to be subjected to steady state is the total power of the energy storage to be discharged, and the specific control strategy is as follows: circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation;
in the valley period and under the condition that P is greater than 0, the microgrid central controller controls each sub energy storage system with the residual electric quantity smaller than the protection upper limit to charge, the total power of the energy storage to be stable state at this time is the total power of the energy storage to be stable state, and the specific control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
when the P is less than 0, no matter what time interval the current time belongs to, the microgrid central controller controls each sub energy storage system with the remaining electric quantity less than the protection upper limit to charge, the total power to be stably stored and stored at this time is the total power of the stable states to be stored and charged, and the specific control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
as shown in fig. 2, for each sub energy storage system that does not satisfy the load shifting condition of the microgrid during each period of time, the microgrid central controller controls the microgrid central controller to be in a standby state.
S103, generating and issuing a control instruction for each sub energy storage system according to the control strategy so as to realize balance control of the residual electric quantity of each sub energy storage system;
in practical application, the microgrid central controller may issue a control instruction to a corresponding local controller, and the local controller may control the discharge or charge of the corresponding sub energy storage system. Because the issued control command is generated based on the control strategy, the balance control of each sub energy storage system can be realized through the cycle distribution principle by issuing the control command.
According to the power distribution control method for the micro-grid system, through the cooperative peak clipping and valley filling control on the plurality of sub energy storage systems, the balance control on the residual electric quantity of each sub energy storage system is realized.
It is worth to be noted that when the energy storage system inside the microgrid realizes the functions of peak clipping and valley filling, most of the energy storage system only aims at the discharge strategy in the peak period and the charge strategy in the valley period, but no action exists in the flat period, so that the strategy is obviously not the optimal strategy, and it can be understood that the economy of the microgrid can be further improved by properly adding a reasonable control strategy in the flat period. Therefore, the present embodiment addresses the above problems, and not only provides a perfect control strategy for the peak and valley periods, but also adds a control strategy for the flat period, specifically:
in step S101, each sub energy storage system that satisfies the microgrid peak clipping and valley filling condition at the current time is determined according to the time period to which the current time belongs and the grid-connected point countercurrent condition at the current time, which includes:
if the time period of the current moment is the peak time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity larger than the protection lower limit;
if the time period of the current moment is a valley time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity smaller than the protection upper limit;
if the grid-connected point countercurrent situation at the current moment is the occurrence of the countercurrent, all the sub energy storage systems meeting the microgrid peak clipping and valley filling conditions at the current moment are all sub energy storage systems with the residual electric quantity smaller than the protection upper limit under the condition that the time period to which the current moment belongs is any time period;
further, the method includes:
if the time period to which the current time belongs is the ordinary time period and the grid-connected point countercurrent situation at the current time is no countercurrent, determining the next time period to which the current time belongs according to a preset time period division standard;
if the next time period of the current time is the peak time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is a sub energy storage system with the residual electric quantity smaller than the protection upper limit;
and if the next time period of the time period to which the current time belongs is the valley time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is each sub energy storage system with the residual electric quantity greater than the protection lower limit.
According to the determining process, for a plurality of distributed sub-energy storage systems, according to three common periods of peak, valley and average, the electricity price policy of each period can be fully utilized, namely, discharging is carried out in the peak period, charging is carried out in the valley period, and for the average period, the charging and discharging strategy is re-customized under the condition that whether the next period is the peak or the valley is fully considered; if the next stage is a peak period, the flat period still charges under the normal condition to meet the discharging requirement of the next stage, and if the next stage is a valley period, the flat period still discharges under the normal condition to meet the charging requirement of the next stage; so as to realize the maximization of the energy storage benefit.
Correspondingly, step S102 is based on the foregoing embodiment, and further includes:
if the next time interval of the current moment is the peak time interval, the total power of the energy storage to be steady state is the total power of the energy storage to be charged steady state, and the specific control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation; if the next time interval of the current moment is the valley time interval, the total power of the energy storage to be stable state is the total power of the energy storage to be discharged to be stable state, and the specific control strategy is as follows: and circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation.
Fig. 2 shows the complete peak clipping and valley filling control logic, as follows:
firstly, determining a time interval to which the current time (marked as t time) belongs; judging whether the active output P of the grid-connected point is greater than zero;
if the time t belongs to the peak time period and P is greater than 0 and no countercurrent exists, the microgrid central controller collects the state values participating in calculation of the microgrid energy storage weighted average value SOCaver, and the state values comprise the following three states a, b and c:
a. if the residual energy is larger than SOCmin and smaller than SOCmax, the microgrid central controller issues a peak clipping instruction, circularly detects the state value of the residual electric quantity SOCi of each sub energy storage system, and if the state value of the SOCi is lower than the SOCmin, the microgrid central controller issues the instruction, and controls the corresponding energy storage equipment of the SOCi to execute a peak clipping quitting instruction through the corresponding local controller, namely the active power output is zero, and each sub energy storage system of which the residual energy meets the microgrid peak clipping and valley filling condition is numbered again to obtain each new SOCi;
b. if the number of the active power outputs is larger than the SOCmax, the microgrid central controller issues a peak clipping instruction, the local controller executes the instruction to control the active power outputs of all the sub energy storage systems meeting the microgrid peak clipping and valley filling conditions, the SOCaver state value and the t moment belong to are detected in a circulating mode, and the corresponding instruction is executed;
c. and if the frequency is smaller than the SOCmin, the microgrid central controller does not execute a peak clipping instruction and issues an instruction to control each sub energy storage system to stand by.
And if the state value of the SOCaver is not lower than the SOCmin, the microgrid central controller switches the instruction state and switches the current peak clipping instruction into a program instruction corresponding to the time period to which the current t belongs.
If the time t belongs to the peak time period and P is less than 0, the microgrid central controller detects the state value of the energy storage weighted average value SOCaver, and the state value comprises the following two states of a and b:
a. if the active output is greater than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be zero and each sub energy storage system to be in standby;
b. and if the active output is less than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be a positive value and all the sub energy storage systems to be charged.
If the time t belongs to the valley period and P is greater than 0 and no countercurrent exists, the microgrid central controller detects the state value of the energy storage weighted average value SOCaver and comprises the following three states of a, b and c:
a. if the detected state value of the SOCaver is greater than the SOCmax, the system microgrid controller controls the stored energy to exit the charging state to operate;
b. if the detected state value of the SOCaver is greater than the SOCmax, the microgrid central controller controls the energy storage to exit the charging state to operate;
c. and if the active power output is larger than the SOCmax, the micro-grid central controller issues an instruction, and the local controller receives the instruction to control the active power output of the corresponding sub energy storage system to be zero and standby.
And if the state value of the SOCaver is not higher than the SOCmin, and the t moment is detected not to belong to the valley period, the microgrid central controller switches the instruction state, and the current peak clipping instruction is switched to the program instruction corresponding to the period to which the current t moment belongs.
If the time t belongs to the valley period and P <0 is in the reverse flow, the microgrid central controller detects the state value of the energy storage SOCap, and the state value comprises the following two states of a and b:
a. if the active output is greater than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be zero and each sub energy storage system to stand by;
b. and when the active output is smaller than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be a positive value and control each sub energy storage system to charge.
If the time t belongs to the flat time interval and P is greater than 0 and no backflow, the method comprises the following two states of a and b:
a. detecting that the next period is a peak period, and the state value of the target maintenance SOCaver is close to SOCmax; if the number of the sub energy storage systems is smaller than the SOCmax, the micro-grid central controller controls the corresponding sub energy storage systems to charge through the local controller; if the number of the sub energy storage systems is larger than the SOCmax, the microgrid central controller issues an instruction to the local controller to control the corresponding sub energy storage systems not to perform any charging and discharging actions;
b. if the next epoch is a valley epoch, the target maintains the state value of SOCaver near SOCmin; if the energy storage capacity is smaller than the SOCmin, the microgrid central controller controls the corresponding sub energy storage systems not to perform any action of charging and discharging through the local controller; and if the current state value is less than the SOCmin, the microgrid central controller quits controlling the stored energy to execute the discharging operation.
If the time t belongs to the flat time period and P <0 is in the reverse flow, the microgrid central controller detects that the energy storage SOCap is a state value and comprises the following two states of a and b:
a. if the active output is greater than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be zero and each sub energy storage system to be in standby;
b. and if the active output is less than the SOCmax, the micro-grid central controller issues an instruction to control the active output to be a positive value and control each sub energy storage system to charge.
And repeating the steps when the time is changed to the next time t + 1.
In summary, the embodiment modifies the conventional peak clipping and valley filling, that is, while considering that the PCC power of the microgrid grid-connected point is sent upwards in a reverse direction (anti-reverse flow), the method not only discharges in the peak period and charges in the valley period, but also is different from the scheme of standby in the ordinary period in the prior art and considers the charging and discharging strategy when the system is in the ordinary period: if the next stage is a peak time period, a charging strategy is adopted, and if the next stage is a valley time period, a discharging strategy is adopted, so that the remaining power is further adjusted under a normal condition, preparation is made for the next time period, and the economic operation mode of the microgrid is fully realized.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
In addition, on the basis of the two embodiments, another embodiment of the present invention further provides a specific scheme for determining a control strategy for circularly allocating the total power to be stored in the energy storage steady state to each of the sub energy storage systems according to the corresponding relationship, including: the energy storage and discharge strategy is used under the condition that the total power of the energy storage and steady state is the total power of the energy storage and discharge to be realized, and the energy storage and charge strategy is used under the condition that the total power of the energy storage and steady state is the total power of the energy storage and charge to be realized.
Referring to fig. 3, the energy storage discharge strategy includes:
the microgrid central controller is used for detecting the steady state P of the commercial power exchange power grid Steady state P of photovoltaic power generation PV Load steady state power P Load Calculating the total power P of the energy storage to-be-discharged steady state General assembly The formula is as follows:
P general assembly ＝P Load -P grid -P PV ；
According to the calculated P General assembly Then equally divide it to obtain
And n is the number of the sub energy storage systems of each sub energy storage system, and then closed-loop proportional-integral regulation or open-loop proportional regulation is introduced according to the current SOCi state of each sub energy storage system. For closed-loop proportional-integral regulation, the regulating factor k (as in FIG. 3)
And output amplitude limiting) is an appropriate parameter set by comparing the SOCi with the reference value socover, if the SOCi and the socover are equal, the adjusting coefficient k =0, and if the SOCi and the socover are not equal, the value k is taken, and the power Δ P required to be adjusted by the sub energy storage system with the output number i is output i The formula is as follows:
ΔP i ＝k(SOC aver -SOC i )；
up to this point, the initial distribution power P of the sub energy storage system with the number i can be calculated i The formula is as follows:
each primary distributed power P is caused by different SOCi i The total power does not reach P General assembly Therefore, the remaining power needs to be counted, and the formula is as follows:
performing secondary distribution on each sub energy storage system according to the calculated residual power, wherein the distribution is mainly based on the weight of the difference value obtained by subtracting the weighted average value SOcover from the residual electric quantity SOCi of each sub energy storage system, and the distribution P of the residual power of the sub energy storage is Residual i The calculation formula of (a) is as follows:
according to the calculated residual power distribution value P of each sub energy storage system Surplus i For the corresponding primary distribution power P i Correcting to obtain the redistributed power P of each sub energy storage system 2i The formula is as follows:
after one adjustment, the residual power P is calculated again Surplus (ii) a If the remaining power P Surplus If not, the residual power P is continued Surplus Distributing until the calculated residual power P Surplus If the number of the sub energy storage systems is zero or the sub energy storage systems do not meet the load shifting condition of the microgrid any more, the circulation is ended, and the maximum circulation frequency is n-1 times.
Referring to fig. 4, the energy storage charging strategy includes:
the microgrid central controller is used for detecting the steady state P of the commercial power exchange power grid Steady state P of photovoltaic power generation PV Load steady state power P Load Calculating the total power P of the energy storage and charging steady state General (1) The formula is as follows:
P general (1) ＝P grid +P PV -P Load ；
According to the calculated P General assembly Then equally divide it to obtain
And n is the number of the sub energy storage systems of each sub energy storage system, and then closed-loop proportional-integral adjustment or open-loop proportional adjustment is introduced according to the current SOCi state of each sub energy storage system. For closed-loop proportional-integral regulation, the regulating factor k (as in FIG. 3)
And output clipping) is based on SOCi and referenceThe value SOCaver compares the set proper parameters, if the two parameters are equal, the adjusting coefficient k =0, if the two parameters are not equal, the value k is taken, and the power delta P which needs to be adjusted and is output to the sub energy storage system with the number i is output i The formula is as follows:
ΔP i ＝k(SOC aver -SOC i )；
up to this point, the initial distribution power P of the sub energy storage system with the number i can be calculated i The formula is as follows:
each primary distributed power P is caused by different SOCi i The total power does not reach P General assembly Therefore, the remaining power needs to be counted, and the formula is as follows:
performing secondary distribution on each sub energy storage system according to the calculated residual power, wherein the distribution is mainly based on the weight of the difference value obtained by subtracting the weighted average value SOcover from the residual electric quantity SOCi of each sub energy storage system, and the distribution P of the residual power of the sub energy storage is Residual i The calculation formula of (a) is as follows:
according to the calculated residual power distribution value P of each sub energy storage system Residual i For the corresponding primary allocated power P i Correcting to obtain the redistributed power P of each sub energy storage system 2i The formula is as follows:
after one adjustment, recalculatedTo the residual power P Surplus (ii) a If the remaining power P Surplus If not, the residual power P is continued Surplus Distributing until the calculated residual power P Surplus If the number of the sub energy storage systems is zero or each sub energy storage system does not meet the micro-grid peak clipping and valley filling conditions any more, the circulation is ended, and the maximum circulation times are n-1.
In this embodiment, when the coordinated peak clipping and valley filling are performed, for the charge and discharge strategies of the multiple sub energy storage systems, according to the socover calculated by the weighted average, a method is provided, in which the current SOCi of each sub energy storage system is compared with the socover, PI closed-loop control is performed, the charge and discharge strategies are adjusted, and for the adjusted charge and discharge power, the remaining power is counted and redistributed, the distribution is mainly based on the total percentage of the current SOCi and the socover, and finally, repeated distribution is performed for many times, so that the SOC of each sub energy storage system tends to be consistent and the power is averaged, and the chaotic control of the multiple sub energy storage systems in the past microgrid is improved.
Another embodiment of the present invention further provides a microgrid central controller of a microgrid system, including: a memory and a processor;
the processor is used for executing all steps stored in the memory;
the steps stored in the memory include the power distribution control method of the microgrid system according to any one of the embodiments described above.
The specific principle is the same as the above embodiments, and is not described in detail here.
At present, energy storage is mainly a centralized scheme and a distributed scheme, and the content set forth by the invention is suitable for a centralized energy storage power station and also suitable for a micro-grid formed by a plurality of distributed energy storage.
In addition, another embodiment of the present invention further provides a microgrid system, as shown in fig. 5, including: the microgrid system comprises at least one local controller, a plurality of sub-microgrids and a microgrid central controller of the microgrid system in the previous embodiment;
as shown in fig. 5, the microgrid central controller is in communication connection with a grid-connected point of the microgrid system;
the local controller is in communication connection with each sub-microgrid with the same sub-microgrid grid-connected point;
and the micro-grid central controller realizes communication with the local controller, the micro-grid master station, the communication server and the real-time server through the optical fiber ring network.
In practical application, for each sub-microgrid, the sub-microgrid can comprise various different types of distributed energy storage devices (lead-acid batteries, ternary lithium batteries, lithium iron phosphate and the like), energy storage inverters, photovoltaic systems, load systems and the like. By the method, the micro-grid system can perform 'peak clipping and valley filling' on the main grid and realize economic operation.
Preferably, the microgrid system further comprises: at least one transformer;
and each sub-microgrid grid-connected point is connected to the power grid through a corresponding transformer or directly connected to the power grid.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (12)
1. A power distribution control method of a micro-grid system is applied to a micro-grid central controller of the micro-grid system, and is characterized in that the power distribution control method of the micro-grid system comprises the following steps:
determining each sub energy storage system meeting the load shifting condition of the microgrid at the current moment according to the time period to which the current moment belongs and the grid-connected point countercurrent condition at the current moment, and calculating to obtain a weighted average value of the residual electric quantity of each sub energy storage system; and if the grid-connected point countercurrent situation at the current moment is no countercurrent, the microgrid peak clipping and valley filling conditions are as follows: the peak period residual capacity is greater than the protection lower limit, or the valley period residual capacity is less than the protection upper limit; and if the grid-connected point countercurrent situation at the current moment is the occurrence of the countercurrent, the microgrid peak clipping and valley filling conditions are as follows: when the countercurrent occurs, the residual electric quantity is less than the upper protection limit; wherein the upper protection limit is greater than the lower protection limit;
determining a control strategy for circularly distributing the total power to be stored in a stable state to each sub energy storage system according to the time interval to which the current moment belongs and the grid-connected point countercurrent condition of the current moment; the corresponding relation is the relation between the corresponding residual capacity and the weighted average value; wherein the total power of the energy storage to be in a steady state is as follows: the total power of the energy storage to-be-discharged steady state, the total power of the energy storage to-be-charged steady state or the total power of the energy storage to-be-charged steady state;
and generating and issuing a control instruction for each sub energy storage system according to the control strategy so as to realize the balance control of the residual electric quantity of each sub energy storage system.
2. The power distribution control method of the microgrid system as claimed in claim 1, wherein each sub energy storage system which meets the microgrid peak clipping and valley filling conditions at the current moment is determined according to the period of time to which the current moment belongs and the grid-connected point countercurrent condition at the current moment, and the method comprises the following steps:
if the period of time to which the current moment belongs is a peak period of time and the grid-connected point countercurrent condition at the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity greater than the protection lower limit;
if the time period of the current moment is a valley time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current moment is each sub energy storage system with the residual electric quantity smaller than the protection upper limit;
and if the grid-connected point countercurrent condition at the current moment is the occurrence of countercurrent, under the condition that the time period of the current moment belongs to any time period, all the sub energy storage systems meeting the microgrid peak clipping and valley filling conditions at the current moment are all sub energy storage systems with the residual electric quantity smaller than the protection upper limit.
3. The power distribution control method of the microgrid system as claimed in claim 2, wherein a control strategy for circularly distributing the total power to be stored in a steady state to each sub energy storage system according to the corresponding relationship is determined according to the time period to which the current moment belongs and the grid-connected point countercurrent condition of the current moment, and the control strategy comprises:
if the period of time to which the current moment belongs is a peak period of time and the grid-connected point countercurrent condition at the current moment is no countercurrent, the total power to be stabilized for energy storage is the total power to be stabilized for energy storage to be discharged, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation;
if the time period of the current moment is a valley time period and the grid-connected point countercurrent condition of the current moment is no countercurrent, the total power of the energy storage to be stabilized is the total power of the energy storage to be charged stabilized, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
if the grid-connected point countercurrent situation at the current moment is the occurrence of countercurrent, and the time period to which the current moment belongs is any time period, the total power of the energy storage to-be-stabilized state is the total power of the energy storage to-be-charged state, and the control strategy is as follows: and circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation.
4. The power distribution control method of the microgrid system as claimed in claim 3, wherein the step of determining the control strategy for circularly distributing the total power to be stored in a steady state to each sub energy storage system according to the corresponding relationship comprises the following steps:
respectively subtracting the difference value of the residual electric quantity of each sub energy storage system and the total power to be stored in a stable state according to the weighted average value, and obtaining the primary distribution power of each sub energy storage system through closed-loop proportional-integral adjustment or open-loop proportional adjustment;
calculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each primary distribution power;
distributing the residual power according to the weight of the difference value obtained by subtracting the weighted average value from the residual electric quantity of each sub energy storage system to obtain a residual power distribution value of each sub energy storage system;
according to each residual power distribution value, correcting the corresponding primary distribution power to obtain the secondary distribution power of each sub energy storage system;
recalculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each redistributed power; and if the residual power is not zero, continuously distributing the residual power until the calculated residual power is zero or the sub energy storage systems do not meet the micro-grid peak clipping and valley filling conditions any more.
5. The power distribution control method of the microgrid system as claimed in claim 3, wherein each sub energy storage system meeting the microgrid peak clipping and valley filling conditions at the current time is determined according to the time period to which the current time belongs and the grid-connected point countercurrent condition at the current time, and the method further comprises:
if the time period to which the current time belongs is the ordinary time period and the grid-connected point countercurrent situation at the current time is no countercurrent, determining the next time period to which the current time belongs according to a preset time period division standard;
if the next time period of the current time is the peak time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is a sub energy storage system with the residual electric quantity smaller than the protection upper limit;
and if the next time period of the time period to which the current time belongs is the valley time period, each sub energy storage system meeting the micro-grid peak clipping and valley filling conditions at the current time is each sub energy storage system with the residual electric quantity greater than the protection lower limit.
6. The power distribution control method of the microgrid system as claimed in claim 5, wherein a control strategy for circularly distributing the total power of the energy storage to be stabilized to each sub energy storage system according to the corresponding relationship is determined according to the time period to which the current moment belongs and the grid-connected point countercurrent condition of the current moment, and further comprising:
if the next time period of the current moment is the peak time period, the total power of the energy storage to be steady state is the total power of the energy storage to be charged steady state, and the control strategy is as follows: circularly distributing the total power of the energy storage to-be-charged steady state to each sub energy storage system with the residual electric quantity smaller than the protection upper limit according to the corresponding relation;
if the next time interval of the current moment is the valley time interval, the total power of the energy storage to be steady state is the total power of the energy storage to be discharged to be steady state, and the control strategy is as follows: and circularly distributing the total power of the energy storage to-be-discharged steady state to each sub energy storage system with the residual electric quantity larger than the lower protection limit according to the corresponding relation.
7. The power distribution control method of the microgrid system as claimed in claim 6, wherein if the period of time to which the current time belongs is a normal time period and the grid-connected point countercurrent condition at the current time is no countercurrent, the control strategy for circularly distributing the total power to be stored in a steady state to each sub energy storage system according to the corresponding relationship is determined, and the control strategy comprises the following steps:
respectively subtracting the difference value of the residual electric quantity of each sub energy storage system and the total power to be stored in a stable state according to the weighted average value, and obtaining the primary distribution power of each sub energy storage system through closed-loop proportional-integral adjustment or open-loop proportional adjustment;
calculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each primary distribution power;
distributing the residual power according to the weight of the difference value obtained by subtracting the weighted average value from the residual electric quantity of each sub energy storage system to obtain a residual power distribution value of each sub energy storage system;
according to each residual power distribution value, correcting the corresponding primary distribution power to obtain the secondary distribution power of each sub energy storage system;
recalculating to obtain residual power according to the total power of the energy storage to-be-stabilized state and each redistributed power; and if the residual power is not zero, the residual power is distributed continuously until each sub energy storage system does not meet the load shifting condition of the microgrid any more.
8. The method for controlling power distribution of the microgrid system as claimed in claim 4 or 7, wherein under the closed-loop proportional-integral regulation, the calculation formula of the primary distribution power is as follows:
ΔP i ＝k(SOC aver -SOC i )；
wherein, P i The power is distributed for the first time of the sub energy storage system with the number i, n is the number of the sub energy storage systems of each sub energy storage system, P General assembly For the total power to be stabilized, Δ P i The power required to be adjusted for the sub energy storage system with the number i, k is an adjustment coefficient, SOC aver As said weighted average value, SOC i The remaining capacity of the sub energy storage system is numbered i.
9. The method for controlling power distribution in a microgrid system according to any of claims 1-7, characterized in that the formula for calculating the weighted average is:
therein, SOC aver As the weighted average, E i Rated capacity, SOC, of sub-energy storage system numbered i i The number of the residual electric quantity of the sub energy storage system is i, and n is the number of the sub energy storage systems of each sub energy storage system.
10. A microgrid central controller of a microgrid system is characterized by comprising: a memory and a processor;
the processor is used for executing all steps stored in the memory;
the steps stored in the memory, including the method for controlling power distribution in a microgrid system according to any one of claims 1 to 9.
11. A microgrid system, comprising: at least one local controller, a plurality of sub-piconets, and a microgrid central controller of the microgrid system of claim 10;
the microgrid central controller is in communication connection with a grid-connected point of the microgrid system;
the local controller is in communication connection with each sub-microgrid with the same sub-microgrid grid-connected point;
and the micro-grid central controller realizes communication with the local controller, the micro-grid master station, the communication server and the real-time server through an optical fiber ring network.
12. The microgrid system of claim 11, further comprising: at least one transformer;
and each sub-microgrid grid-connected point is connected to the power grid through a corresponding transformer or directly connected to the power grid.
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