118 results about "Battery storage power station" patented technology

The invention relates to a battery power control method for types of high-capacity megawatt battery energy storage power stations, which comprises the following steps of: A, reading data; B, determining a total command value of each battery energy storage system by using a wavelet transform controller module; C, calculating battery power command values of each energy storage subunit by using a power allocation controller module; D, aggregating the battery power command values of each energy storage subunit by using a power aggregation module; and E, outputting the data. In the method, cooperative control over battery power in the types of high-capacity megawatt battery energy storage power stations based on lithium ions, flows, sodium-sulphur and the like is finished by an industrial personal computer and a communication platform, real-time effective control over the types of high-capacity megawatt battery energy storage power stations can be realized, and the aims of improving the utilization efficiency of energy storage batteries of different types and prolonging the service life of each energy storage battery are fulfilled according to the characteristics of the batteries of different types that lithium ion batteries, sodium-sulphur batteries and flow batteries serve as low frequency, intermediate frequency and high frequency components in current required total power respectively and the like.

The invention provides a method and a system for controlling a battery energy storage power station of supporting black start of a light-preserved power generation system. The method comprises steps of obtaining power station data including power grid operation states, load types, photovoltaic output values, load power values and energy storage current transformer charged states; determining whether or not a power grid has a fault according to the power grid operation state; when the power grid has a fault, calculating the number of energy storage current transformers for charge-discharge power distribution according to the photovoltaic output values and load power values and using the current transformer power optimization principle; and establishing a light-preserved combined power generation output optimal objective function, and determining the power of each energy storage current transformer for charge-discharge power distribution according to the load power values, the photovoltaic output values and the charged states of the energy storage current transformers for charge-discharge power distribution. The invention achieves black start of a power grid through a battery energy storage system combined with a photovoltaic electric field when the power grid has a fault, and achieves control of stable operation of the power grid.

The invention belongs to the field of electrical power systems, which relates to a simulation equivalent method of a wind-photovoltaics-energy storage joint power generation system in load flow calculation and electromechanical transient simulation. An equivalent overall scheme of the wind-photovoltaics-energy storage joint power generation system adopts the method of combination equivalent. By dividing the joint power generation system into three parts including a wind power station, a photovoltaic power station and a battery energy storage power station, and enabling the three parts to perform equivalent polymerization respectively according to respective operating characteristics, a plurality of field/power station equivalent models after machine gathering are obtained. Finally, the wind power station, the photovoltaic power station and the battery energy storage power station converge at the point of a common coupling (PPC) to achieve grid connection. Operating characteristics of the whole wind-photovoltaics-energy storage joint power generation system are shown up on a power grid at the PPC, and equivalent modeling of the wind-photovoltaics-energy storage joint power generation system is achieved.

The invention provides a self-adaptive dynamic planning control method and system for a large-scale energy storage power station. The method includes steps of setting a structure and control target parameters of a self-adaptive dynamic planning control system; initiating the parameters and importing an initial state of a controlled object; calculating the original wind electricity power fluctuation rate of a current moment t and performing smoothing treatment on the original wind electricity power by using a change rate control method; calculating the wind storage power fluctuation rate subjected to the smoothing treatment, the energy storage power and the SOC (State Of Charge) of the energy storage system; initiating a training evaluation module and an evaluation module; calculating and saving the control strategy, the wind storage power fluctuation rate, the energy storage power and the SOC of the energy storage system of each moment; outputting the control strategy, the wind storage power fluctuation rate subjected to the smoothing treatment, the energy storage power and the SOC of the energy storage system of each moment. The system includes a parameter initializing module, a data acquisition and calculation module, an execution module, an evaluation module and an output module and the like. By adopting the method and system provided by the invention, optimization control of the large-scale energy storage system is realized and the technical economical efficiency of the energy storage system is improved.

The invention discloses a depth control method for an energy storage power station participating in primary frequency modulation of a power grid, which is characterized in that a grid-connected inverter of the energy storage power station is equivalent to a synchronous voltage source with excitation control and speed regulation control, the energy storage power station adopts a control strategy ofa synchronous machine third-order model, and the frequency modulation depth of the battery energy storage power station participating in the primary frequency modulation of the power grid by settinga difference adjustment coefficient sigma<battery>% of the energy storage power station according to a flexibility index and a static frequency characteristic of the battery energy storage power station. The invention further discloses a contribution calculation method for the energy storage power station participating in primary frequency modulation of the power grid. The frequency modulation depth of the energy storage power station participating in system primary frequency modulation is controlled, so that the rated power, the rated capacity and the climbing rate of the energy storage powerstation are reasonably configured to stabilize the steady-state frequency of the system after primary frequency modulation in a reasonable range, the frequency stability and the voltage stability ofthe energy storage power station for supporting grid connection of the new energy system are improved, a contribution factor lambda is defined, and the importance of the energy storage power station in the power grid system to frequency modulation is analyzed.

The invention provides a scheduling method for a pumped storage power station to participate in an electric power system with wind power. First, the installed capacity of the pumped storage power station is classified, schemes are screened to obtain feasible schemes, and current scheduling models for the pumped storage power station to participate in the electric power system with wind power are established according to different feasible schemes; then, the models are solved to obtain operating points of a peak-load regulation unit of the pumped storage power station, unit combination and operating points of a thermal power unit and operating costs and air abandon volumes of the system in different feasible schemes; the air abandon volumes of the electric power system with wind power in all the feasible schemes are compared, and if the air abandon volumes are not consistent, the scheme with the smallest air abandon volume is selected as the optimum scheme; or else, the total positive spinning reserves and the total negative spinning reserves provided by the system in different periods are calculated according to the result, the expected value of electric quantity deficiency of the system is calculated with a Monte Carlo simulation method so as to obtain the power shortage cost, finally, the total costs of all the feasible schemes are compared, and the feasible scheme with the smallest total cost is selected as the optimum classification scheme.

The invention discloses an energy management combined control strategy of a user-side battery energy storage power station, and solves the problem that a present user-side energy storage power stationis single in energy management method and hard to satisfy requirements of different application scenes. A collected real-time operation data information decision is used to determine a present application control mode, the charging/discharging power of different energy-storage converters is calculated according to the coordinated cooperation logics among different control strategies and the SOC value of a battery pack of the energy-storage power station, and problems of coordinated cooperation among the different operation control strategies are solved. The control strategy of the invention is characterized in that safe, stable and continuous operation of the energy storage system is ensured, the application range is wide, applications can be configured flexibly in different scenes, and the strategy is not limited by the capacity of the energy-storage power station.

The present invention provides an energy management method of a multi-type battery energy storage power station considering charge and discharge rates, that includes: reading related data of the battery energy storage power station; calculating charge or discharge rate characteristic values of battery energy storage machine sets; calculating initial power command values of the battery energy storage machine sets; judging whether the initial power command values of the battery energy storage machine sets exceed the maximum allowable charge or discharge power of the machine sets in real time, if more than, online correcting and re-calculating the initial power command values of the battery energy storage machine sets; otherwise, setting the initial power command values of the energy storage machine sets as the power command values thereof; and summarizing the power command values of the battery energy storage machine sets, and outputting the same. With the reasonable control of the charge and discharge rates of the energy storage machines sets as target, the energy management method of the present invention is used for carrying out power coordinated control and energy management in the energy storage power station, and considering the service lives of energy storage batteries in the control strategy to achieve the functions of avoiding abuse of the energy storage batteries as much as possible, delaying battery aging and the like.

The invention provides a battery energy efficiency testing device and a testing method thereof. The testing method comprises the steps of charging and discharging a battery by using a constant current, determining the charging energy and the discharging energy of the battery under a state of charge (SOC) value and calculating the energy efficiency of the battery. Compared with the prior art, the testing method has the advantages that the measurement of an open-circuit voltage of the battery is neglected, and electric vehicles and energy storage power stations can be tested during running processes.

The invention relates to a pumped storage power station characteristic accurate simulation method for optimized operation of a wind power contained power grid system. The pumped storage power station characteristic accurate simulation method comprises the steps of: modeling a wind curtailment state of the wind power contained power grid system into a wind curtailment state linear function related to a binary variable; modeling relevant operating states of all pumped storage power stations in the system into a power station operating state linear function related to the binary variable on the basis of the binary variable; constraining the system through the combination of the two linear functions; and simulating output states of the pumped storage power stations when the system is in the wind curtailment state. The pumped storage power station characteristic accurate simulation method has the beneficial effects of conducting linear modeling on the situation that power generation by releasing water is forbidden by the pumped storage power stations when the system is in the wind curtailment state so that a model made by a power grid annual operating plan accurately considering pumped storage power station characteristics is still a mixed integer programming model, ensuring solving efficiency of the mode, being more inline with the actual power system dispatching condition and the actual operation conditions of the pumped storage power stations, and being capable of providing most intuitive judgment basis for dispatchers through calculation results.

The invention relates to a megawatt liquid flow battery energy storage power station real-time power control method and a system thereof. The method includes the following steps of A), reading total power demand value of a liquid flow battery energy storage power station and related operation data of the power station in real time, and conducting storing and managing on the data; B) calculating initial power command value of liquid flow battery energy storage subelements of the liquid flow battery energy storage power station; C) calculating power command value to be allocated to the liquid flow battery energy storage subelements; and D) after the power command value of the liquid flow battery energy storage subelements is collected, outputting the power command value to the liquid flow battery energy storage power station. The system comprises a communication module, a data storage and management module, a total power initial allocation control module and a real-time power correction module. The method and the system have the advantages of being convenient to operate, easy to achieve and control in the process of actual application and the like. The method and the system can achieve the aims of effectively controlling and allocating of real-time power of the megawatt liquid battery energy storage power station.

Disclosed in the invention is a reactive power distribution and control method of a battery energy-storage power station. The method comprises the following steps: obtaining a current total reactive power required value of a battery energy-storage power station and related data of all energy storage sets in the battery energy-storage power station, and calculating current maximum allowable reactive power characteristic values of all energy storage sets; and with the current maximum allowable reactive power characteristic values, controllable state values, maximum available apparent powers, rated powers, active powers, and maximum allowable active powers and the like as constraint conditions, reactive power coordination control inside the energy-storage power station is carried out by using reasonable control of reactive power total demands of all energy storage sets as the control objective. According to the invention, the current maximum allowable reactive power characteristic values of the energy storage converters are taken into consideration in the control strategy; and on the basis of the strategy, reactive power distribution of all energy storage converters in the energy-storage power station is optimized.

The invention relates to an auxiliary service pricing method for an energy-storage power station participating in power system frequency modulation. The auxiliary service pricing method is characterized by comprising energy-storage-system synchronous-motor-like primary frequency modulation characteristic capacity configuration, energy-storage-system control and auxiliary service pricing determination with the energy-storage power station participating in the power system frequency modulation and the like. The capacity configuration can be maximized, the energy storage investment cost can be reduced, the auxiliary service pricing method is scientific and reasonable, and is high in applicability and good in effect, the energy storage capacity can be configured reasonably, and the balance of payment of the energy-storage power station can be ensured.

The invention relates to a method and a system for controlling a battery energy storage power station for primary frequency modulation of a power grid. The method comprises the steps of determining the frequency modulation requirement of the power grid according to the frequency deviation change rate of the power grid; determining the energy demand of the battery energy storage power station according to the battery charge information of the battery energy storage power station; and adjusting the frequency modulation power of the battery energy storage power station based on the power grid frequency modulation requirement and the energy demand of the battery energy storage power station. According to the method, the rapid response characteristic of the battery energy storage power stationis utilized, and fast response and rapid recovery are carried out on the frequency change of the power grid, so that the steady-state performance of primary frequency modulation is improved; and meanwhile, the battery energy state of the battery energy storage power station is optimized, so that the battery energy storage power station has the capability of primary frequency modulation for a longtime, and the transient performance of primary frequency modulation is improved.

The invention discloses an active power distribution method of a battery energy storage power station. SOC (state of charge) values and active power of battery units are acquired in real time, the battery units of the energy storage power station are classified, and charging and discharging ranges of each class of the battery units are calculated; according to the charging and discharging ranges of each class of the battery units, the charging and discharging regulating capacity of the battery units is calculated, and finally, distribution of the active power is performed on each battery unit according to the regulating capacity of the battery units. Thus, the energy storage power station responds to scheduling of a power grid through control on charging and discharging of the battery units, and the acceptable capacity of the power grid for intermittent renewable energy source power generation is increased; secondly, the battery units are classified according to real-time SOCs of the battery units, startup and shutdown times of the battery units can be reduced, the utilization rate of resources of the battery energy storage power station is increased, and service lives of the battery units are prolonged.

A method for managing the energy of a battery energy storage power station based on wind power prediction, the method comprising the following steps: acquiring the previous predicted value of wind power, a current actual wind power value, and the controllable state value and charging state value of each current energy storage unit; respectively calculating the upper and lower threshold characteristic values of wind power prediction based on the previous predicted value of the wind power; and modifying in real time the wind storage combined output control target via a finite-state machine control module, and determining the required value of the total power of a battery energy storage power station, the finite-state machine control module comprising an energy storage SOC finite-state machine and a wind power finite-state machine. The method considers the short-term predicted value of wind power in the strategy for a battery energy storage power station, thus realizing coordinated power control of the battery energy storage power station and optimal management of stored energy based on predicted wind power.

The invention provides a high-capacity energy storage power station connected with grids by synchronous motors, and is applicable to constructing hundred megawatt level battery energy storage power stations. High-capacity and natural grid-friendly grid connection characteristics of the synchronous motors in electric power systems are used for reference. The high-capacity energy storage power station comprises one or more power station unit. The power station units comprise energy storage systems, PCS (process control systems), first motors, couplings and second motors. The high-capacity energy storage power station has the advantages that the first motors and the second motors not only can be operated as motors, but also can be operated as power generators, and motor groups can be formed by the first motors and the second motors via the couplings; the second motors are the synchronous motors and are connected into the medium-voltage and high-voltage grids; operation states of the first motors can be quickly regulated by the PCS, excitation systems of the second motors can be regulated by the second motors, active power and reactive power can be transmitted to the alternating-current grids or can be absorbed, accordingly, bidirectional flowing and four-quadrant operation can be carried out on energy, and the high-capacity energy storage power station participates in frequency modulation, peak regulation and voltage regulation of the electric power systems and can be used as a black start power source for the electric power systems.

The invention discloses an energy storage unit active support control method and system based on a synchronous machine three-order model. A grid-connected inverter of an energy storage power station simulates a voltage source of a virtual synchronous machine, excitation control and speed regulation control are achieved, necessary inertia and damping characteristics are provided for a power grid system, and stable support of frequency and voltage of a new energy system is achieved. The control method gets rid of traditional phase-locked loop control, so the power angle control of the grid-connected inverter does not change depending on the change of a network frequency, necessary inertia and damping are provided for the new energy system, the autonomy and disturbance rejection of the control of the grid-connected inverter of the energy storage power station are improved, and the grid-connected frequency stability supporting capability and voltage stability supporting capability of the energy storage power station are improved.

The invention provides a method and a system for distributing real-time power of a battery energy storage power station for tracking planned output. The method comprises the following steps of reading relevant data of a battery energy storage power station in real time, and carrying out storage and management through the data; calculating a total power requirement command value of the current battery energy storage power station; calculating power command values of energy storage units in the battery energy storage power station; and summarizing the power command values of the energy storage units and outputting the summarized power command values to an external monitoring platform. The system comprises that the method for distributing the real-time power of the battery energy storage power station for tracking planned output is completed through a communication module, a data storage and management module, a tracking plan control module and a genetic algorithm control module, which are arranged on an industrial personal computer, together with the external monitoring platform, thereby being capable of realizing a function that a tracking plan curve is supported by applying the battery energy storage power station, and realizing the purposes of effectively controlling and distributing the real-time power of megawatt-grade lithium battery energy storage power stations.

The invention relates to a megawatt battery energy storage power station real-time power control method and a system thereof. The method includes the following steps of A), reading a total power demand of a battery energy storage power station and related operation data of the power station in real time, and conducting storing and managing on the total power demand and the operation data; B) obtaining initial power command value of battery energy storage subelements of the battery energy storage power station; C) conducting real-time diagnosis and amendment on the initial power command value of the battery energy storage subelements so as to confirm power command value to be allocated to the battery energy storage subelements; and D) after the power command value of the battery energy storage subelements is collected, outputting the power command value to the battery energy storage power station so as to achieve real-time control on the battery energy storage power station. The system comprises a communication module, a data storage and management module, a total power initial allocation control module and a real-time adjusting module. The method and the system can conveniently and efficiently achieve the aims of controlling and allocating of real-time power of a megawatt lithium ion battery energy storage power station.

The invention provides an energy management method and a system of a cascade battery energy storage power station based on an empirical mode decomposition, which not only performs power leveling control on a microgrid system composed of a wind power system, a photovoltaic system and an energy storage system, but also prolongs the battery life and improves the energy efficiency of the energy storage system. This system mainly includes the Ensemble Empirical Mode Decomposition (EEMD) frequency division controller and energy storage controller. Adaptive order adjustment module and volatility calculation module are introduced into the EEMD frequency division controller, so that the wind-photovoltaic power curve is decomposed into low-frequency components which meet the requirements of grid-connection and high-frequency components which are absorbed by the energy storage system. The energy storage controller distributes the energy storage output power to the battery proportionally so that the state of charge of the battery tends to be uniform, thereby avoiding the overall capacity attenuation caused by the partial overcharge and overdischarge of the battery.

The invention relates to a method and a system for causing an energy storage power station to smooth wind and photovoltaic power generation fluctuation based on a change rate. The method comprises the following steps: A reading data and perform storage and management on the data; B determining the change rate of a dynamic slope limiter limit signal based on the operating state and the rated power of a wind driven generator and a photovoltaic generator; C calculating a wind and photovoltaic power generation total power smooth target value; D calculating the battery energy storage power station total power requirement based on the photovoltaic power generation total power smooth target value; E and outputting the data. The system comprises a communication module, a data storage and management module, a change rate limit calculation module, a dynamic slope limiter module, a power distribution controller module and the like. According to the invention, the wind and photovoltaic power generation fluctuation ratio can be effectively restrained below a fluctuation ratio limit value, and the wind and photovoltaic power generation output can be effectively smoothed, so that the using burden of an energy storage battery can be effectively reduced and a battery energy storage power station system is controlled conveniently and flexibly while smoothing the wind and photovoltaic power generation output.