CN116706971B - Hierarchical control method suitable for energy scheduling of optical storage system - Google Patents
Hierarchical control method suitable for energy scheduling of optical storage system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a layered control method suitable for energy scheduling of an optical storage system, which is characterized in that a battery is additionally provided with a BMS system, and the battery is processed according to the following steps, so that whether charging or discharging prohibition instructions exist in communication of the BMS system or not is detected in real time, and corresponding processing is performed. When the inverter-side energy is switched from the output to the input state, different assignment processes are performed. And after the charging loop of the battery controller is saturated, updating the inverter side power reference quantity in real time. Thus, hierarchical control during energy scheduling of the optical storage system can be realized, and the coupling degree of power control at the battery side and the inversion side is reduced through upper layer scheduling distribution. The power scheduling method has the advantages that the power scheduling method has better compatibility on the inverter side and the battery side of the optical storage system. The voltage stabilizing loop can be additionally arranged on the lower battery control loop, so that the stability of the direct current bus voltage in the power control and change process of the output side and the battery side of the inverter is improved.
Description
Technical Field
The invention relates to an energy scheduling method of an optical storage system, in particular to a layered control method suitable for energy scheduling of the optical storage system, and belongs to the field of optical storage systems.
Background
For the conventional light storage system, the energy scheduling function is built in. In the most common scheduling manner, the charging and discharging of the battery unit is mainly adjusted in real time according to the detected amount of ct or ammeter near the commercial power end, i.e. whether ct or ammeter is sufficient to reflect the power generation of photovoltaic. If the power generation is sufficient, i.e. the electricity meter reacts with excess power to the grid, the charge of the battery is increased. If the power generation is insufficient, i.e. the electricity meter reaction uses electricity from the grid, the discharge capacity of the battery is increased.
Meanwhile, for safe operation of the inverter, under some non-ideal conditions or under the safety regulations of special areas, the output power of the inverter often needs to be reduced or adjusted. For example, the external environment (high temperature) during operation of the inverter, or the active power of the inverter is externally scheduled, or over-frequency load shedding in regulatory requirements, etc.
Such control of the inverter output power side, however, would disrupt the battery-tested power scheduling mechanism, and therefore, a strategy for optimizing allocation by the energy scheduling layer is required. The conventional method at present only carries out simple mobilization management and control, realizes the mobilization configuration without working conditions in a multi-strategy mode, and can not effectively plan the charge and discharge conditions of the battery in the system in time.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a layered control method suitable for energy scheduling of an optical storage system.
In order to achieve the aim, the invention adopts the technical scheme that the method is suitable for the hierarchical control method of the energy scheduling of the optical storage system:
A BMS system is added to the battery and is processed as follows,
Step one, detecting whether a charge-forbidden or discharge-forbidden instruction exists in the communication of the BMS in real time, if so, entering a step two, otherwise, entering a step three;
step two, shielding the output of a current loop of a battery controller to control the charge and discharge current of the battery to 0;
Step three, judging whether the safety terminal has the requirement of controlling the output power of the inversion side of the machine or meets the overheat load reduction, respectively assigning a battery side power reference quantity P bat * and an inversion side power reference quantity P inv *, if the safety terminal has the requirement or meets the overheat load reduction, entering a step four, otherwise, entering a step five;
Step four, when the energy of the inversion side is switched from output to input state, assigning P bat * as a rated charging power value, and closing a boost controller of the photovoltaic panel; when the energy of the inversion side is switched from the input state to the output state, the value P bat * is the rated discharge power value, and the value P inv * is the target value of the inversion side output power control;
Step five, a power value P meter of an output ammeter in the system and a reference value P meter * of an ammeter side required by the system are obtained through a scheduling module attached to the BMS system, meanwhile, a current battery side power value P bat is obtained, and a battery power reference value P bat * updated in real time is obtained through a formula P bat *＝Pbat+Pmeter-Pmeter *;
and step six, after the charging loop of the battery controller is saturated, updating the inverter side power reference quantity P inv * in real time.
Further, in the above hierarchical control method suitable for energy scheduling of an optical storage system, in the fifth step, the reference value P meter * is 0 in a spontaneous use state; in other states, the value range is [ - (rated power value), 0].
Further, in the above hierarchical control method for energy scheduling of an optical storage system, in the fifth step, positive values of P bat and P bat * represent the power of battery discharge and the reference of the power of discharge, negative values represent the power of battery charge and the reference of the power of charge, positive values of P meter and P meter * represent the power of consumed utility power, and negative values represent the power of redundant grid connection of the inverter.
Further, in the above hierarchical control method suitable for energy scheduling of an optical storage system, in the fifth step, P bat * is used as an input of a power loop of a battery side controller, P inv * is used as an input of a power loop of an inverter side controller, and the range of values P inv * A kind of electronic device corresponds to [ - (rated power value) and rated power value ].
Furthermore, in the above hierarchical control method for energy scheduling of an optical storage system, in the sixth step, the inverter side power reference amount P inv * is updated in real time by the formula P inv *＝Pinv+Pmeter-Pmeter *, wherein positive values of P inv and P inv * represent the power output by the inverter side, negative values represent the power input by the inverter side, and the value range of P inv * is limited to [0, (rated power value) ].
Further, in the hierarchical control method suitable for energy scheduling of the optical storage system, a voltage stabilizing loop is added to the lower battery control loop, the direct current bus voltage reference V bus * of the voltage stabilizing loop superimposes a bus voltage adjusting allowance δvbus in a positive bias or negative bias mode according to the polarity sign (P bat *) of the current battery power reference P bat *, and the allowance δvbus is used as a control target amount of the voltage stabilizing loop according to a formula V bus *+sign(Pbat *)*δvbus.
Still further, in the hierarchical control method suitable for energy scheduling of an optical storage system, the control target amount and the error value of the real-time sampled direct current bus voltage value vbus_f are connected to a sign function module to judge whether the direct current bus voltage value vbus_f is turned over or not, the controller is a PI regulator or the like, sign (P bat *) is a sign function of a battery power reference amount, a limiting processing value range of a controller loop output quantity is [0,1] and then marked as a limiting coefficient K, the limiting coefficient K is multiplied by the output quantity of a battery side outer ring controller and then is used as an input reference amount I of a current ring, and the value of a bus voltage regulation margin δvbus is smaller than a control margin of a photovoltaic side PV voltage stabilizing loop by 5 to 10v.
The beneficial effects of the invention are mainly as follows:
1. Hierarchical control during energy scheduling of the optical storage system can be achieved, and the coupling degree of power control on the battery side and the inversion side is reduced through upper layer scheduling distribution.
2. The power scheduling of the inverter side and the battery side of the optical storage system has better compatibility.
3. The voltage stabilizing loop can be additionally arranged on the lower battery control loop, so that the stability of the direct current bus voltage in the power control and change process of the output side and the battery side of the inverter is improved.
Drawings
FIG. 1 is a hierarchical schematic diagram of single phase optical storage system energy scheduling.
Fig. 2 is a schematic diagram of a battery side bus stability control loop.
Detailed Description
The invention provides a hierarchical control method suitable for energy scheduling of an optical storage system. The following detailed description of the present invention is provided in connection with the accompanying drawings, so as to facilitate understanding and grasping thereof.
The hierarchical control method for energy scheduling of the light storage system shown in fig. 1 to 2 is distinguished in that: the battery is additionally provided with a BMS system and is processed as follows.
Step one, detecting whether a charge-forbidden or discharge-forbidden instruction exists in communication of a BMS (battery management system) in real time, if so, entering a step two, otherwise, entering a step three.
And step two, shielding the output of a current loop of the battery controller to control the charge and discharge current of the battery to 0.
Step three, judging whether the safety terminal has the requirement of controlling the output power of the inversion side of the machine or meets the overheat load reduction, respectively assigning a battery side power reference quantity P bat * and an inversion side power reference quantity P inv * according to the corresponding active limiting conditions, if the requirement or the overheat load reduction is met, entering a step four, otherwise entering a step five.
Step four, when the energy of the inversion side is switched from output to input state, assigning P bat * as a rated charging power value, and closing a boost controller of the photovoltaic panel (Pv); when the inverter-side energy is switched from the input to the output state, the rated discharge power value is assigned P bat *, and the inverter-side output power control target value is assigned P inv *.
And fifthly, acquiring a power value P meter of an output ammeter in the system and a reference value P meter * of an ammeter side required by the system through a scheduling module attached to the BMS system, simultaneously acquiring a current battery side power value P bat, and acquiring a battery power reference value P bat * updated in real time according to a formula P bat *＝Pbat+Pmeter-Pmeter *.
Specifically, for better control discrimination, the reference value P meter * is 0 in the voluntary state. In other states, the range of values is [ - (rated power value), 0]. Meanwhile, positive values of P bat and P bat * represent the power discharged by the battery and the power reference discharged, and negative values of both represent the power charged by the battery and the power reference charged. Positive values of P meter and P meter * represent power consumed by the utility power, and negative values of both represent power of the inverter in excess grid connection. During implementation, P bat * may be used as an input to the battery side controller power loop, P inv * may be used as an input to the inverter side controller power loop, and the range of values P inv * A kind of electronic device corresponds to [ - (rated power value), rated power value ].
And step six, after the charging loop of the battery controller is saturated, updating the inverter side power reference quantity P inv * in real time. Specifically, the inverter-side power reference amount P inv * may be updated in real time by the formula P inv *＝Pinv+Pmeter-Pmeter *. Wherein positive values of P inv and P inv * represent power output on the inversion side, negative values represent power input on the inversion side, and the range of the value of P inv * is limited to [0, (rated power value) ].
In combination with a preferred embodiment of the invention, a voltage stabilizing loop can be additionally arranged on the lower battery control loop, so that the voltage stability of bus (direct current bus) is met. The dc bus voltage reference V bus * of the voltage regulation loop may superimpose a positive or negative offset bus voltage regulation margin δvbus according to the polarity sign (P bat *) of the current battery power reference P bat *. Equation V bus *+sign(Pbat *)*δvbus can be used as a control target amount for the voltage regulation loop.
Further, the error value of the target value and the real-time sampled direct current bus voltage value Vbus_f can be controlled, and the access sign function module judges whether the controller is turned over or not and then is accessed. Specifically, the controller is a PI (proportional integral) regulator, sign (P bat *) is a sign function of the battery power reference, the range of the limiting processing value of the controller loop output is marked as a current limiting coefficient K after corresponding to [0,1], and the current limiting coefficient K is multiplied by the output of the battery side outer ring controller and then is used as the input reference I of the current ring. Therefore, the purpose of stabilizing the voltage of the direct current bus is achieved by limiting the current at the battery side. Meanwhile, the value of the bus voltage regulation allowance delta Vbus is smaller than the control allowance of the photovoltaic side PV voltage stabilizing loop by 5-10 v. Thereby, it is achieved that the control of the battery discharge is limited in preference to the photovoltaic side PV output under the condition that the inverter side output power is scheduled to be limited.
In connection with the actual implementation of the present invention, the actual scheduling and grading steps can be optimized into the most core three steps, as shown in fig. 1:
s1 is a priority determination of whether or not a charge/discharge prohibition instruction exists in the battery BMS instruction. If the charge and discharge prohibition instruction exists, the limit_Flg flag is switched to close the output of the battery controller current loop.
S2, judging whether power scheduling of the inversion side exists or not. The battery power reference and the inverter side output power reference may be assigned separately as needed.
S3, internal scheduling of the machine EMS. The battery power reference and the inverter side output power reference can be assigned according to corresponding formulas. During implementation, its priority order corresponds to S1> S2> S3.
Taking the battery side bus stable control loop as an example, consideration may be given to the dc bus voltage. Specifically, V bus * superimposes a positive or negative bias one bus voltage regulation margin δvbus according to the polarity sign (P bat *) of the current battery power reference P bat *. Thereafter, a control target amount of the restriction loop is generated according to the formula V bus *+sign(Pbat *)*δvbus. The access sign function module determines whether to turn over and then access the controller through the control target quantity and the error value of the direct current bus voltage value Vbus_f sampled in real time. During implementation, the controller may use PI (proportional integral) regulators, etc. Meanwhile, sign (P bat *) is a sign function of the battery power reference quantity, and the limiting processing value range of the controller loop output quantity is corresponding to [0,1] and then is recorded as a current limiting coefficient K. The current limiting coefficient K is multiplied by the output quantity of the battery side outer ring controller and then used as an input reference quantity I of a current ring. Therefore, the purpose of stabilizing the voltage of the direct current bus can be achieved by limiting the current at the battery side.
From the above description, it can be found that the present invention has the following advantages:
1. Hierarchical control during energy scheduling of the optical storage system can be achieved, and the coupling degree of power control on the battery side and the inversion side is reduced through upper layer scheduling distribution.
2. The power scheduling of the inverter side and the battery side of the optical storage system has better compatibility.
3. The voltage stabilizing loop can be additionally arranged on the lower battery control loop, so that the stability of the direct current bus voltage in the power control and change process of the output side and the battery side of the inverter is improved.
While the foregoing has been described in terms of embodiments of the present invention, it will be appreciated that the embodiments of the invention are not limited by the foregoing description, but rather, all embodiments of the invention may be modified in structure, method or function by one skilled in the art to incorporate the teachings of this invention, as expressed in terms of equivalent or equivalent embodiments, without departing from the scope of the invention.
Claims (2)
1. The layered control method suitable for the energy scheduling of the optical storage system is characterized by comprising the following steps of: a BMS system is added to the battery and is processed as follows,
Step one, detecting whether a charge-forbidden or discharge-forbidden instruction exists in the communication of the BMS in real time, if so, entering a step two, otherwise, entering a step three;
step two, shielding the output of a current loop of a battery controller to control the charge and discharge current of the battery to 0;
Step three, judging whether the safety terminal has the requirement of controlling the output power of the inversion side of the machine or meets the overheat load reduction, respectively assigning a battery side power reference quantity P bat * and an inversion side power reference quantity P inv *, if the safety terminal has the requirement or meets the overheat load reduction, entering a step four, otherwise, entering a step five;
Step four, when the energy of the inversion side is switched from output to input state, assigning P bat * as a rated charging power value, and closing a boost controller of the photovoltaic panel; when the energy of the inversion side is switched from the input state to the output state, the value P bat * is the rated discharge power value, and the value P inv * is the target value of the inversion side output power control;
Step five, a power value P meter of an output ammeter in the system and a reference value P meter * of an ammeter side required by the system are obtained through a scheduling module attached to the BMS system, meanwhile, a current battery side power value P bat is obtained, and a battery power reference value P bat * updated in real time is obtained through a formula P bat *=Pbat+Pmeter-Pmeter *;
Step six, after the charging loop of the battery controller is saturated, updating the inverter side power reference quantity P inv * in real time;
in the fifth step, the reference value P meter * is 0 in the spontaneous use state; in other states, the value range is [ - (rated power value), 0];
In the fifth step, positive values of P bat and P bat * represent the power discharged by the battery and the reference amount of the discharged power, negative values represent the power charged by the battery and the reference amount of the charged power, positive values of P meter and P meter * represent the power consumed by the mains supply, and negative values represent the redundant grid-connected power of the inverter;
In the fifth step, P bat * is used as an input of the battery side controller power loop, P inv * is used as an input of the inverter side controller power loop, and the range value of P inv * corresponds to [ - (rated power value), rated power value ];
In the sixth step, the inverter side power reference amount P inv * is updated in real time according to the formula P inv *=Pinv+Pmeter-Pmeter *, wherein positive values of P inv and P inv * represent the power output by the inverter side, negative values represent the power input by the inverter side, and the value range of P inv * is limited to [0, (rated power value) ]; and adding a voltage stabilizing loop to the lower battery control loop, wherein the direct-current bus voltage reference V bus * of the voltage stabilizing loop is used for superposing a bus voltage regulating allowance delta Vbus with positive bias or negative bias according to the polarity sign (P bat *) of the current battery power reference P bat *, and the voltage regulating allowance delta Vbus is used as the control target quantity of the voltage stabilizing loop according to a formula V bus *+sign(Pbat *)*δvbus.
2. The hierarchical control method for energy scheduling of an optical storage system according to claim 1, wherein: the control target quantity and the error value of the real-time sampled direct current bus voltage value Vbus_f are connected to a sign function module to judge whether the controller is turned over and then connected to the controller, the controller is a PI regulator and the like, sign (Pbat) is a sign function of battery power reference quantity, the limiting processing value range of the loop output quantity of the controller is [0,1] and then marked as a limiting coefficient K, the limiting coefficient K is multiplied by the output quantity of the battery side outer ring controller and then used as the input reference quantity I of a current ring, and the value of the bus voltage regulating allowance delta Vbus is smaller than the control allowance of the photovoltaic side PV voltage stabilizing loop by 5-10 v.
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