CN107706927B - Control method for participation of battery energy storage power supply system in secondary frequency modulation of power grid based on two-layer programming - Google Patents
Control method for participation of battery energy storage power supply system in secondary frequency modulation of power grid based on two-layer programming Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to a control method for a battery energy storage power supply system to participate in secondary frequency modulation of a power grid based on two-layer programming. The method comprises the following steps: step 1: collecting data in real time; step 2: judging whether the frequency modulation dead zone is crossed, if so, turning to the step 3, otherwise, turning to the step 6; and step 3: when ACE<ACEdWhile, and SOC is less than or equal to SOCminTurning to step 4; when ACE<ACEdAnd SOC is>SOCminTurning to step 5; when ACE>ACEuWhile, and SOC is more than or equal to SOCmaxTurning to step 4; when ACE>ACEuAnd SOC is<SOCmaxTurning to step 5; and 4, step 4: the traditional secondary frequency modulation power supply acts; and 5: the two have synergistic effect; step 6: the battery energy storage power supply system does not output power; the invention has the beneficial effects that: the frequency modulation tasks with small amplitude and frequent fluctuation can be effectively finished, and the optimal configuration is realized.
Description
The technical field is as follows:
the invention relates to a battery energy storage power supply system, in particular to a control method for participating in secondary frequency modulation of a power grid by using a battery energy storage power supply system based on two-layer planning.
Background art:
the power grid frequency is one of three main indicators of the quality of electric energy, and the guarantee of the stability of the power grid frequency and the qualification of the power grid frequency are one of important tasks of power grid dispatching operation. Wind power, photovoltaic and other fluctuating and uncertain new energy are rapidly developed, and the large-scale power generation and grid connection of the new energy challenge the frequency modulation capability of a power grid.
The frequency modulation of the traditional conventional power grid is completed by hydroelectric power and thermal power units, and along with the large-scale power generation grid connection of renewable energy sources, the defects of the traditional frequency modulation power supply begin to appear: the response time lag of the thermal power generating unit is long, the primary frequency modulation is limited by the problems of heat accumulation and the like, and the secondary frequency modulation quantity is influenced by the climbing speed of the thermal power generating unit and various delays; the hydroelectric generating set is greatly influenced by seasons and regions. For these problems, although the capacity of the unit can be increased to make up for the problems, the problems cannot be solved fundamentally, the cost is high, the fluctuation frequency of the power grid frequency is increased due to the high proportion penetration of the fluctuating new energy, the frequency modulation scene requirements with small amplitude and frequent fluctuation are more common, the abrasion of the unit is aggravated by bearing all frequency modulation tasks by the traditional frequency modulation power supply, and the economy is also reduced.
At present, the energy storage industry makes a great breakthrough in electrochemical batteries such as flow batteries, lithium ion batteries and sodium-nickel batteries, and physical energy storage technologies such as compressed air and phase change heat storage, and various new technologies such as all-solid batteries, lithium-sulfur batteries, lithium air batteries, liquid metal batteries and P2G are greatly developed; the energy storage power supply has the characteristics of quick response, accurate power instruction tracking and the like when participating in frequency modulation, energy storage is introduced into a power grid, and the method is an effective way for assisting the traditional frequency modulation power supply to complete frequency modulation. However, the control method which cooperates with the traditional secondary frequency modulation power supply and performs optimal configuration to complete the secondary frequency modulation of the power grid is an urgent problem to be solved.
The invention content is as follows:
the invention provides a control method for a battery energy storage power supply system to participate in secondary frequency modulation of a power grid based on two-layer planning, and aims to provide a method for the battery energy storage power supply system to assist a traditional secondary frequency modulation power supply to adjust the frequency of the power grid.
The specific technical scheme is as follows:
a battery energy storage power supply system based on two-layer programming participates in a control method of secondary frequency modulation of a power grid, wherein the battery energy storage power supply system is subjected to output control by a PCS control module and is merged into the power grid through a breaker and a transformer; the method comprises the following steps:
step (ii) of1, acquiring area control deviation ACE signals of a power grid in real time and power requirement △ P of secondary frequency modulation of the power gridAGCThe data and the battery state of charge (SOC) data obtained from a battery energy storage power supply system management system;
step 2: judging whether the area control deviation ACE crosses a frequency modulation dead zone, if so, turning to a step 3, otherwise, turning to a step 6; dead zone range of ACEd≤ACE≤ACEuThe ACEuUpper limit value of regulation dead zone for zone control deviation signal, ACEdControlling the lower limit value of the adjustment dead zone of the deviation signal for the region;
and step 3:
when ACE<ACEdWhile, and SOC is less than or equal to SOCminTurning to step 4;
when ACE<ACEdAnd SOC is>SOCminTurning to step 5;
when ACE>ACEuWhile, and SOC is more than or equal to SOCmaxTurning to step 4;
when ACE>ACEuAnd SOC is<SOCmaxTurning to step 5;
and 4, step 4: the battery energy storage power supply system does not act, the traditional secondary frequency modulation power supply acts, and the battery energy storage system outputs power: pbattery＝0，
The traditional secondary frequency modulation power output: pgeneration＝△PAGCThen returning to the step 1;
and 5: the battery energy storage power supply system and the traditional secondary frequency modulation power supply cooperate to complete coordination control of secondary frequency modulation of the power grid; the specific action scheme is determined by the following double-layer planning method:
first, a first layer of planning: planning and optimizing by taking optimal frequency modulation index as a target to obtain a series of P of the battery energy storage power supply systemiAnd the achievable optimal frequency modulation effect index value;
on the basis, the second layer of planning: a series of P determined by the first layer of planning with the goal of most economical capacity allocationiOptimizing by taking the optimal frequency modulation effect index value as technical constraint to determine the optimal capacity configuration;
the output of the battery energy storage power supply system is as follows: pbattery
The traditional secondary frequency modulation power output: pgeneration＝△PAGC-Pbattery；
Then returning to the step 1;
step 6: the battery energy storage power supply system does not output power; and then returns to step 1.
As a preferred scheme, the first level planning in step 5 specifically includes the following steps:
an objective function: min Fd
Evaluation index of frequency modulation effect:
△fi＝fi-fN；
the battery energy storage power supply system participates in the power grid frequency modulation mode and is set as a fixed droop control mode:
Pi＝-K·Δfi
wherein, FdN is the sampling frequency in the sampling frequency modulation process, corresponding to △ fiIs the system frequency deviation value f corresponding to the ith sampling in the frequency modulation processiFor the system frequency value corresponding to the ith sample in the frequency modulation process, deviating from the standard frequency fNI.e. a deviation value of 50 Hz; k is a unit adjusting coefficient of the battery energy storage power system participating in frequency modulation; piThe output value of the battery energy storage power system participating in frequency modulation is obtained;
the constraints are as follows:
and (3) output limit constraint of the frequency modulation power supply:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Storing energy for batteriesCapacity of source system participating in secondary frequency modulation of power grid, [ D ]b(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uThe upper limit of the frequency modulation capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid;
state of charge, SOC, limit:
SOCmin≤SOC(i)≤SOCmax，
number of charge and discharge times N:
0≤N≤Nmax，
wherein:
Pbreal time output of the battery energy storage power supply system, Eb.rateK is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOC (k-1) is the charge state value at the (k-1) time in the frequency modulation process, SOC (k) is the charge state value at the (k) time in the frequency modulation process, N is the rated capacity of the battery energy storage power supply system, k is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOCmaxThe maximum charge-discharge cycle number of the battery energy storage power supply system is obtained;
rated capacity of battery energy storage power supply system:
Pithe output power value of the corresponding battery energy storage power system participating in the secondary frequency modulation process of the power grid is obtained; n is the sampling frequency in the sampling frequency modulation process; erateRated capacity required by a battery energy storage power supply system participating in secondary frequency modulation of a power grid; prateAnd the rated power required by the battery energy storage power supply system participating in secondary frequency modulation of the power grid is provided.
As a further preferable solution, the second-level planning in step 5 specifically includes the following steps:
an objective function: min { Erate}
PrateMax { i ═ 0, …, n | p (i) };
the constraints are as follows:
Min{Fd}±10％，
and (3) output limit constraint of the secondary frequency modulation battery energy storage power supply system:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Capacity of battery energy storage power system participating in secondary frequency modulation of power grid, [ Db(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uThe upper limit of the frequency modulation capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid;
the number of charging and discharging times is as follows: n is more than or equal to 0 and less than or equal to Nmax；
Limiting the charging and discharging depth: SOCmin≤SOC(i)≤SOCmax，
Wherein:
compared with the prior art, the invention has the beneficial effects that:
the method comprises the steps of (I) optimally planning the action scheme of the battery energy storage power supply system for assisting the traditional secondary frequency modulation power supply by using a two-layer planning method, and adjusting secondary frequency modulation ACE signals of a regional power grid. The first layer of planning takes the optimal frequency modulation effect as a target and takes the output limit of a battery energy storage power supply system and a traditional secondary frequency modulation power supply as a constraint; the second layer of planning takes the technical indexes determined by the first layer of planning as technical constraints, combines the output limit constraints of the battery energy storage power supply system and the traditional secondary frequency modulation power supply, performs optimization aiming at the optimal capacity configuration of the battery energy storage power supply system, determines the action instruction of the battery energy storage power supply system participating in assisting the secondary frequency modulation, and obtains the optimal capacity (power/capacity) configuration result; the method comprises the steps that AGC commands are issued according to a power grid dispatching control center, ACE signals are distributed between a battery energy storage power supply system and a traditional secondary frequency modulation power supply, the ACE signals are distributed to the traditional secondary frequency modulation power supply or a battery Energy Management System (EMS), the traditional secondary frequency modulation power supply and the battery energy storage power supply system are controlled respectively, and the traditional secondary frequency modulation power supply and the battery energy storage power supply system act in a coordinated mode, so that the regional control deviation of a power grid is recovered to a frequency modulation dead zone range, the transient state and the steady state performance of the secondary frequency modulation of the power grid are improved, meanwhile, the capacity required to be configured by.
The frequency modulation tasks with small amplitude and frequent fluctuation can be effectively finished, the optimal configuration is realized by effectively matching with the traditional frequency modulation power supply, the frequency problem of the power grid can be effectively improved by participating in the frequency modulation of the auxiliary power grid, the upgrading of the capacity of equipment is delayed, the utilization rate of the equipment is improved, and the updating cost of the equipment is saved.
Description of the drawings:
fig. 1 is a general flowchart of a control method for participating in secondary frequency modulation of a power grid by a battery energy storage power supply system based on two-tier programming according to the present invention.
Fig. 2 is a flowchart of a first layer planning method for participating in secondary frequency modulation of a power grid by using a battery energy storage power supply system based on two-layer planning, which is provided by the invention.
Fig. 3 is a flowchart of a method for participating in secondary frequency modulation second-tier planning of a power grid by using a battery energy storage power supply system based on two-tier planning, provided by the invention.
The specific implementation mode is as follows:
example (b):
the invention will be further described with reference to the following figures and examples.
The main ideas of the invention are as follows: firstly, acquiring a regional control deviation ACE (area control error) signal from a power grid control center, dividing operation conditions by combining the regional control deviation ACE signal and a charge state SOC (state of charge) of a battery energy storage power supply system, controlling the output of the battery energy storage power supply system by using a method based on two-layer planning when the battery energy storage power supply system participates in secondary frequency modulation of a power grid, determining a technical index value of the battery energy storage power supply system participating in frequency modulation by using a first-layer planning with the output limit of the battery energy storage power supply system and a traditional frequency modulation power supply as a constraint target and planning and optimizing by using the technical index determined by the first-layer planning as a technical constraint with the output limit constraint of the battery energy storage power supply system and the traditional frequency modulation power supply as a target to determine an action instruction of the battery energy storage power supply system participating in assisting frequency modulation, obtaining the configuration result of the optimal capacity (power/capacity) by utilizing the research from the first layer planning to the second layer planning; and then, according to AGC instructions sent by a power grid dispatching control center, the AGC instructions are distributed to a traditional frequency modulation power supply or a battery Energy Management System (EMS) through a coordination control module, and the traditional frequency modulation power supply and the battery energy storage power supply are respectively controlled to act cooperatively, so that a secondary frequency modulation process is completed.
A battery energy storage power supply system based on two-layer programming participates in a control method of secondary frequency modulation of a power grid, wherein the battery energy storage power supply system is subjected to output control by a PCS control module and is merged into the power grid through a breaker and a transformer; the method comprises the following steps:
step 1, acquiring area control deviation ACE signals of a power grid and power demand △ P of secondary frequency modulation of the power grid in real timeAGCThe data and the battery state of charge (SOC) data obtained from a battery energy storage power supply system management system;
step 2: judging whether the area control deviation ACE crosses a frequency modulation dead zone, if so, turning to a step 3, otherwise, turning to a step 6; dead zone range of ACEd≤ACE≤ACEuThe ACEuUpper limit value of regulation dead zone for zone control deviation signal, ACEdDead zone of regulation for zone control of deviation signalA limit value;
and step 3:
when ACE<ACEdWhile, and SOC is less than or equal to SOCminTurning to step 4;
when ACE<ACEdAnd SOC is>SOCminTurning to step 5;
when ACE>ACEuWhile, and SOC is more than or equal to SOCmaxTurning to step 4;
when ACE>ACEuAnd SOC is<SOCmaxTurning to step 5;
and 4, step 4: the battery energy storage power supply system does not act, the traditional secondary frequency modulation power supply acts, and the battery energy storage system outputs power: pbattery＝0，
The traditional secondary frequency modulation power output: pgeneration＝△PAGCThen returning to the step 1;
and 5: the battery energy storage power supply system and the traditional secondary frequency modulation power supply cooperate to complete coordination control of secondary frequency modulation of the power grid; the specific action scheme is determined by the following double-layer planning method:
first, a first layer of planning: planning and optimizing by taking optimal frequency modulation index as a target to obtain a series of P of the battery energy storage power supply systemiAnd the achievable optimal frequency modulation effect index value;
on the basis, the second layer of planning: a series of P determined by the first layer of planning with the goal of most economical capacity allocationiOptimizing by taking the optimal frequency modulation effect index value as technical constraint to determine the optimal capacity configuration;
the output of the battery energy storage power supply system is as follows: pbattery
The traditional secondary frequency modulation power output: pgeneration＝△PAGC-Pbattery；
Then returning to the step 1;
step 6: the battery energy storage power supply system does not output power; and then returns to step 1.
The first level planning in the step 5 specifically comprises the following steps:
an objective function: min Fd
Evaluation index of frequency modulation effect:
△fi＝fi-fN；
the battery energy storage power supply system participates in the power grid frequency modulation mode and is set as a fixed droop control mode:
Pi＝-K·Δfi
wherein, FdN is the sampling frequency in the sampling frequency modulation process, corresponding to △ fiIs the system frequency deviation value f corresponding to the ith sampling in the frequency modulation processiFor the system frequency value corresponding to the ith sample in the frequency modulation process, deviating from the standard frequency fNI.e. a deviation value of 50 Hz; k is a unit adjusting coefficient of the battery energy storage power supply participating in frequency modulation; piThe output value of the battery energy storage power supply participating in frequency modulation is obtained;
the constraints are as follows:
and (3) output limit constraint of the frequency modulation power supply:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Capacity of battery energy storage power system participating in secondary frequency modulation of power grid, [ Db(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uThe upper limit of the frequency modulation capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid;
state of charge, SOC, limit:
SOCmin≤SOC(i)≤SOCmax，
number of charge and discharge times N:
0≤N≤Nmax，
wherein:
Pbreal time output of the battery energy storage power supply system, Eb.rateK is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOC (k-1) is the charge state value at the (k-1) time in the frequency modulation process, SOC (k) is the charge state value at the (k) time in the frequency modulation process, N is the rated capacity of the battery energy storage power supply system, k is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOCmaxThe maximum charge-discharge cycle number of the battery energy storage power supply system is obtained;
rated capacity of battery energy storage power supply system:
Pithe output power value of the corresponding battery energy storage power system participating in the secondary frequency modulation process of the power grid is obtained; n is the sampling frequency in the sampling frequency modulation process; erateRated capacity required by a battery energy storage power supply system participating in secondary frequency modulation of a power grid; prateAnd the rated power required by the battery energy storage power supply system participating in secondary frequency modulation of the power grid is provided.
The second-level planning in the step 5 specifically comprises the following steps:
an objective function: min { Erate}
PrateMax { i ═ 0, …, n | p (i) };
the constraints are as follows:
Min{Fd}±10％，
and (3) output limit constraint of the secondary frequency modulation battery energy storage power supply system:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Capacity of battery energy storage power system participating in secondary frequency modulation of power grid, [ Db(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uThe upper limit of the frequency modulation capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid;
the number of charging and discharging times is as follows: n is more than or equal to 0 and less than or equal to Nmax；
Limiting the charging and discharging depth: SOCmin≤SOC(i)≤SOCmax，
Wherein:
Claims (3)
1. a battery energy storage power supply system based on two-layer programming participates in a control method of secondary frequency modulation of a power grid, wherein the battery energy storage power supply system is subjected to output control by a PCS control module and is merged into the power grid through a breaker and a transformer; the method is characterized by comprising the following steps:
step 1, acquiring area control deviation ACE signals of a power grid and power demand △ P of secondary frequency modulation of the power grid in real timeAGCThe data and the battery state of charge (SOC) data obtained from a battery energy storage power supply system management system;
step 2: judging whether the area control deviation ACE crosses a frequency modulation dead zone, if so, turning to a step 3, otherwise, turning to a step 6; dead zone range of ACEd≤ACE≤ACEuThe ACEuUpper limit value of regulation dead zone for zone control deviation signal, ACEdControlling deadlines of deviation signals for zonesA zone lower limit value;
and step 3:
when ACE<ACEdWhile, and SOC is less than or equal to SOCminTurning to step 4;
when ACE<ACEdAnd SOC is>SOCminTurning to step 5;
when ACE>ACEuWhile, and SOC is more than or equal to SOCmaxTurning to step 4;
when ACE>ACEuAnd SOC is<SOCmaxTurning to step 5;
and 4, step 4: the battery energy storage power supply system does not act, and the traditional secondary frequency modulation power supply acts,
the output of the battery energy storage system is as follows: pbattery＝0，
The traditional secondary frequency modulation power output: pgeneration＝△PAGCThen returning to the step 1;
and 5: the battery energy storage power supply system and the traditional secondary frequency modulation power supply cooperate to complete coordination control of secondary frequency modulation of the power grid; the specific action scheme is determined by the following double-layer planning method:
first, a first layer of planning: planning and optimizing by taking optimal frequency modulation index as a target to obtain a series of P of the battery energy storage power supply systemiAnd the achievable optimal frequency modulation effect index value;
on the basis, the second layer of planning: a series of P determined by the first layer of planning with the goal of most economical capacity allocationiOptimizing by taking the optimal frequency modulation effect index value as technical constraint to determine the optimal capacity configuration;
the output of the battery energy storage power supply system is as follows: pbattery
The traditional secondary frequency modulation power output: pgeneration＝△PAGC-Pbattery；
Then returning to the step 1;
step 6: the battery energy storage power supply system does not output power; and then returns to step 1.
2. The control method for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid based on the two-tier planning as claimed in claim 1, wherein the first-tier planning in the step 5 specifically comprises the following steps:
an objective function: min Fd
Evaluation index of frequency modulation effect:
△fi＝fi-fN；
the battery energy storage power supply system participates in the power grid frequency modulation mode and is set as a fixed droop control mode:
Pi＝-K·Δfi
wherein, FdN is the sampling frequency in the sampling frequency modulation process, corresponding to △ fiIs the system frequency deviation value f corresponding to the ith sampling in the frequency modulation processiFor the system frequency value corresponding to the ith sample in the frequency modulation process, deviating from the standard frequency fNI.e. a deviation value of 50 Hz; k is a unit adjusting coefficient of the battery energy storage power supply participating in frequency modulation; piThe output value of the battery energy storage power supply participating in frequency modulation is obtained;
the constraints are as follows:
and (3) output limit constraint of the frequency modulation power supply:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Capacity of battery energy storage power system participating in secondary frequency modulation of power grid, [ Db(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uFor the traditional secondary frequency modulation power supplyThe upper limit of the frequency modulation capacity participating in the frequency modulation of the power grid;
state of charge, SOC, limit:
SOCmin≤SOC(i)≤SOCmax，
number of charge and discharge times N:
0≤N≤Nmax，
wherein:
Pbreal time output of the battery energy storage power supply system, Eb.rateK is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOC (k-1) is the charge state value at the (k-1) time in the frequency modulation process, SOC (k) is the charge state value at the (k) time in the frequency modulation process, N is the rated capacity of the battery energy storage power supply system, k is the value time, △ T is the frequency sampling period in the frequency modulation process, the value is determined by the power grid dispatching sampling data, SOCmaxThe maximum charge-discharge cycle number of the battery energy storage power supply system is obtained;
rated capacity of battery energy storage power supply system:
Pithe output power value of the corresponding battery energy storage power system participating in the secondary frequency modulation process of the power grid is obtained; n is the sampling frequency in the sampling frequency modulation process; erateRated capacity required by a battery energy storage power supply system participating in secondary frequency modulation of a power grid; prateAnd the rated power required by the battery energy storage power supply system participating in secondary frequency modulation of the power grid is provided.
3. The control method for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid based on the two-tier programming as claimed in claim 2, wherein the second-tier programming in the step 5 specifically comprises the following steps:
an objective function: min { Erate}
PrateMax { i ═ 0, …, n | p (i) };
the constraints are as follows:
Min{Fd}±10％，
and (3) output limit constraint of the secondary frequency modulation battery energy storage power supply system:
[Db(i)]d≤D_b(i)≤[Db(i)]u，
[Dg(i)]d≤D_g(i)≤[Dg(i)]u，
[Db(i)]dlower limit of frequency modulation capacity for battery energy storage power supply system to participate in secondary frequency modulation of power grid, D_b(i) Capacity of battery energy storage power system participating in secondary frequency modulation of power grid, [ Db(i)]uThe upper limit of the frequency modulation capacity for the battery energy storage power supply system to participate in the secondary frequency modulation of the power grid; [ D ]g(i)]dLower limit of frequency modulation capacity for the traditional secondary frequency modulation power supply to participate in the frequency modulation of the power grid, D_g(i) For the capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid, [ Dg(i)]uThe upper limit of the frequency modulation capacity of the traditional secondary frequency modulation power supply participating in the frequency modulation of the power grid;
the number of charging and discharging times is as follows: n is more than or equal to 0 and less than or equal to Nmax；
Limiting the charging and discharging depth: SOCmin≤SOC(i)≤SOCmax，
Wherein:
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