CN115759421A - Full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and method - Google Patents
Full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and method Download PDFInfo
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Abstract
The invention provides a full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system and a method, wherein the system comprises a wind power plant, a full-power variable-frequency pumped storage power station, a standby diesel power plant, a control system and a load system; the full-power variable-frequency pumped storage power station comprises a full-power variable-frequency pumped storage unit, an upper reservoir and a lower reservoir; the full-power variable-frequency pumping and storage unit comprises a pumped storage power station generator set and a pumped storage power station pumped water pump. According to the invention, by optimally regulating and controlling the power generation of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant and setting the optimal configuration parameters of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant, the wind energy utilization rate can be effectively improved, the power supply quality of a power grid is effectively ensured, and the wind energy resource is developed and utilized to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of power generation system planning, and particularly relates to a full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system and method.
Background
The large-scale development of the wind power generation system brings huge pressure to the frequency modulation and peak shaving of the power system. The power supply mode of the wind power and pumped storage combined operation can convert wind power with overlarge specific gravity into high-quality electric energy to be indirectly input into a power grid, or convert redundant wind power in the load valley of the power grid into water energy to be stored, so that the load of a fan is reduced, the wind energy utilization rate and the power supply quality of the power grid are greatly improved, and the wind energy resource is developed and utilized to the maximum extent.
The pumped storage and wind power combined power supply system has a plurality of types, different operation modes and various condition limitations, and how to optimally configure the pumped storage and the wind power is a key technical problem of the system engineering design and operation scheduling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration method, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides a full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system, which comprises a wind power plant, a full-power variable-frequency pumped storage power station, a standby diesel power plant, a control system and a load system, wherein the wind power plant is connected with the control system; the full-power variable-frequency pumped storage power station comprises a full-power variable-frequency pumped storage unit, an upper reservoir and a lower reservoir; the full-power variable-frequency pumping and storage unit comprises a pumped storage power station generator set and a pumped storage power station pumped water pump;
a first power supply line of the wind farm is connected to a power grid via a limiting element; a second power supply circuit of the wind power plant is connected to the power utilization end of the pumped storage power station pumped water pump; the standby diesel power plant is connected to the power grid through a third power supply line; the power generation end of the pumped storage power station generator set is connected to the power grid through a fourth power supply circuit; the pumped storage power station generator set is arranged between the upper reservoir and the lower reservoir; the power transmission end of the power grid is connected to the power utilization end of the load system through a fifth power supply line; the power transmission end of the power grid is connected to the pumped storage power station pumped water pump through a sixth power supply line; the pumped water pump of the pumped storage power station is used for conveying water in the lower reservoir to the upper reservoir;
the control system is respectively connected with the wind power plant, the full-power variable-frequency pumped storage power station, the standby diesel power plant and the load system.
Preferably, the first power supply line is provided with a first control switch (K1); a second control switch (K2) is arranged on the second power supply line; the third power supply line is provided with a third control switch (K3); a fourth control switch (K4) is arranged on the fourth power supply line; and a fifth control switch (K5) is arranged on the sixth power supply line.
The invention also provides a method for optimally configuring the system by combining full-power frequency conversion pumped storage and wind power supply, which comprises the following steps of:
step 1, determining the optimal configuration parameters of a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system, wherein the optimal configuration parameters comprise: the number of fans of the wind power plant, the adjustment storage capacity of an upper reservoir, the assembly capacity of a full-power variable-frequency pump storage unit and the installed capacity of a standby diesel power plant;
step 2, installing a full-power frequency conversion storage and wind power combined power supply optimization configuration system according to the optimal configuration parameters determined in the step 1, and in the system operation process, adopting the following strategies to carry out full-power frequency conversion storage and wind power combined power supply optimization:
step 2.1, regulating and controlling the wind power plant, wherein the method comprises the following steps:
step 2.1.1, collecting the total output power P of the wind power plant at the current calculation time step WP And system electrical load D of load system LS ；
Step 2.1.2, calculating to obtain the maximum allowable power P of the wind power directly connected to the power grid system by adopting the following formula max ：
P max ＝α*D LS
Wherein:
alpha is the wind power access proportion and is a system set value;
step 2.1.3, maximum allowable power P of wind power directly connected to the power grid system is compared max Total output power P of wind farm WP If P is WP ≤P max Then the second control switch (K2) is closed, and the first control switch (K1) is completely opened, so that the total output power P of the wind power plant WP Completely conveying the power to a power grid system;
if P is WP ＞P max Then the first control switch (K1) and the second control switch (K2) are opened, and the total output power P of the wind power plant is converted into the total output power P WP Maximum allowable power P in max Part of power is transmitted to the power grid system, and the rest output power is transmitted to a pumped water pump of the pumped storage power station to be used as one of electric energy sources of the pumped water pump of the pumped storage power station;
step 2.2, the full-power frequency conversion pumped storage power station is regulated and controlled, and the method comprises the following steps:
step 2.2.1, obtaining the upper reservoir water storage volume V of the current calculation time step according to the following formula e ：
Wherein:
V e0 upper reservoir water storage volume V for the previous calculation time step e0 ；
D PS Calculating the input power of the full-power variable-frequency pumping and storing unit in the current time step under the working condition of a water pump;
P HP calculating the output power of the full-power variable-frequency pumping and storing unit in the current time step under the power generation working condition;
delta t is the calculation time step of iterative calculation;
η P calculating the pumping comprehensive efficiency of the pumping water pump of the pumped storage power station of the current time step;
η T calculating the comprehensive power generation efficiency of the pumped storage power station generator set of the current time step;
γ w is water-heavy;
Z u calculating the upper reservoir water level of the current time step;
Z d calculating the water level of the lower reservoir at the current time step;
step 2.2.2, setting the regulated storage capacity of the upper reservoir obtained in the step 1 as V min ,V max ]Wherein, V min For the minimum value permitted by the reserve volume of the upper reservoir, V max The maximum value allowed by the water storage volume of the upper reservoir;
comparing upper reservoir water storage volume V of current calculation time step e Regulating storage capacity [ V ] of upper reservoir min ,V max ]The relationship of (1):
if V e ＞V max Controlling the water pump of the pumped storage power station to stop pumping water;
if V e ＜V min Controlling the generator set of the pumped storage power station to stop generating electricity;
if V e ∈[V min ,V max ]Enabling a pumped water pump of the pumped storage power station to perform a normal pumping working condition, and enabling a generator set of the pumped storage power station to perform a normal power generation working condition;
step 2.3, regulating and controlling a standby diesel power plant, wherein the method comprises the following steps:
step 2.3.1, obtaining the output power P of the standby diesel power plant of the current calculation time step by adopting the following formula DP ：
P DP ＝D LS +D PS -P WP -P HP
Wherein:
D LS calculating the system power load of the current time step;
D PS calculating the input power of the full-power variable-frequency pumping and storing unit in the current time step under the working condition of a water pump;
P WP calculating the total output power of the wind power plant at the current time step;
P HP calculating the output power of the full-power variable-frequency pumping and storage unit in the current time step under the power generation working condition;
P DP for standby of current calculation time stepThe output power of a diesel power plant;
step 2.3.2, if the calculated output power P of the standby diesel power plant DP If greater than 0, make the standby diesel power plant according to P DP Transmitting electric energy to a power grid system; if the calculated output power P of the standby diesel power plant DP If the power is equal to 0, the standby diesel power plant is closed, so that the standby diesel power plant does not transmit electric energy to the power grid system;
therefore, the power supply conditions of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant are optimally controlled according to the system power load of the load system in the current calculation time step, and the system power load is met.
Preferably, in step 1, the number of wind turbines of the wind farm is determined by:
step 1.1, determining the number of fans as n in a configuration research stage for a full-power variable-frequency extraction and storage and wind power combined power supply optimization configuration system 1 ,n 2 ,…,n p (ii) a Determining the regulated storage capacity v of the upper reservoir 1 ,v 2 ,…,v q ；
Therefore, when the number of the fans is n 1 In time, the upper reservoir adjusts the storage capacity to select v respectively 1 ,v 2 ,…,v q And performing full-power frequency conversion pumped storage and wind power combined power supply, and respectively obtaining q power supply guarantee rates, which are expressed as: e.g. of the type 1 ,e 2 ,…,e q (ii) a Using the abscissa as the power supply guarantee rate and the ordinate as the upper reservoir adjustment storage capacity, drawing q discrete points in a coordinate system, and performing curve fitting on the q discrete points to obtain the number n of fans 1 A corresponding first curve;
in the same way, the number n of the fans is obtained 2 The corresponding second curve, \ 8230;, is equal to the number n of fans p The corresponding p-th curve;
for each curve, obtaining inflection points of the curve, and performing curve fitting on the inflection points of the p curves to obtain an optimal configuration curve of the power supply guarantee rate, the upper reservoir regulation storage capacity and the number of fans;
and 1.2, knowing the target power supply guarantee rate, searching an optimal configuration curve to obtain the upper reservoir regulation storage capacity and the number of fans which are most matched with the target power supply guarantee rate.
Preferably, in step 1, the assembly capacity of the full-power variable-frequency pumping and storage unit is determined in the following manner:
in a calculation period, acquiring the power generation and water pumping requirements of each calculation time step on the full-power variable-frequency storage unit; counting the power generation and water pumping requirements of the full-power variable-frequency pumping and storing unit in each calculation time step to obtain the maximum value as the original installed capacity of the full-power variable-frequency pumping and storing unit;
then, gradually reducing the installed capacity of the full-power variable-frequency pumping and storing unit from the original installed capacity of the full-power variable-frequency pumping and storing unit, and calculating the power supply guarantee rate corresponding to each installed capacity to obtain a curve of the installed capacity and the power supply guarantee rate; and searching the installed capacity matched with the target power supply guarantee rate in the curve, and taking the searched installed capacity as the finally determined installed capacity of the full-power variable-frequency pumping and storing unit.
Preferably, in step 1, the installed capacity of the spare diesel power plant is determined by:
in a calculation period, a standby diesel power plant is not started, a power supply notch of the system load of each calculation time step is obtained, the installed capacity of the standby diesel power plant corresponding to the power supply notch and the power supply guarantee rate of the calculation time step are obtained, and therefore a curve of the installed capacity and the power supply guarantee rate of the standby diesel power plant is drawn; in the curve, the installed capacity of the standby diesel power plant matched with the target power supply guarantee rate is searched for and used as the finally determined installed capacity of the standby diesel power plant.
Preferably, after determining configuration parameters of the number of fans of the wind power plant, the adjusted storage capacity of the upper reservoir, the assembly capacity of the full-power variable-frequency pumping storage unit and the installed capacity of the standby diesel power plant, the method further comprises the following steps:
further optimizing each configuration parameter, including: the comprehensive economic index of the combined power supply system is a secondary objective of reducing the storage capacity of the upper reservoir and the installed scale of the standby diesel power plant by taking the minimum electric energy benefit, coal saving benefit and investment cost as a total objective in an optimization time period, so that the number of fans of the wind power plant, the adjusted storage capacity of the upper reservoir, the assembled capacity of the full-power variable-frequency pump storage unit and the installed capacity of the standby diesel power plant are finally determined.
The full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and method provided by the invention have the following advantages:
by optimizing power generation regulation and control of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant and setting the optimal configuration parameters of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant, the wind energy utilization rate can be effectively improved, the power supply quality of a power grid is effectively guaranteed, and the wind energy resources are developed and utilized to the maximum extent.
Drawings
Fig. 1 is a schematic structural diagram of a full-power frequency conversion pumped storage and wind power combined power supply optimization configuration system provided by the invention.
Fig. 2 is a relational graph of the upper reservoir regulation storage capacity, the number of fans and the power supply guarantee rate provided by the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system, which comprises a wind power plant, a full-power variable-frequency pumped storage power station, a standby diesel power plant, a control system and a load system, wherein the full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system is shown in a figure 1; the full-power variable-frequency pumped storage power station comprises a full-power variable-frequency pumped storage unit, an upper reservoir and a lower reservoir; the full-power variable-frequency pumping and storing unit comprises a pumped storage power station generator set and a pumped storage power station pumped water pump;
a first power supply line of the wind farm is connected to a power grid via a limiting element; a second power supply circuit of the wind power plant is connected to the power utilization end of the pumped storage power station pumped water pump; the standby diesel power plant is connected to the power grid through a third power supply line; the power generation end of the pumped storage power station generator set is connected to the power grid through a fourth power supply circuit; the pumped storage power station generator set is arranged between the upper reservoir and the lower reservoir; the power transmission end of the power grid is connected to the power utilization end of the load system through a fifth power supply line; the power transmission end of the power grid is connected to the pumped storage power station pumped water pump through a sixth power supply line; the pumped water pump of the pumped storage power station is used for conveying water in the lower reservoir to the upper reservoir;
the control system is respectively connected with the wind power plant, the full-power variable-frequency pumped storage power station, the standby diesel power plant and the load system.
Wherein, the first power supply line is provided with a first control switch K1; a second control switch K2 is arranged on the second power supply line; a third control switch K3 is arranged on the third power supply line; a fourth control switch K4 is arranged on the fourth power supply line; and a fifth control switch K5 is arranged on the sixth power supply line.
The invention also provides a method for optimally configuring the system by combining full-power frequency conversion pumped storage and wind power supply, which comprises the following steps of:
step 1, determining the optimal configuration parameters of a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system, comprising the following steps of: the number of fans of the wind power plant, the adjustment storage capacity of an upper reservoir, the assembly capacity of a full-power variable-frequency pump storage unit and the installed capacity of a standby diesel power plant;
in this step, with reference to fig. 2, the number of fans in the wind farm is determined in the following manner:
step 1.1, determining the number of fans as n in a configuration research stage for a full-power variable-frequency extraction and storage and wind power combined power supply optimization configuration system 1 ,n 2 ,…,n p (ii) a Determining the regulated storage capacity v of the upper reservoir 1 ,v 2 ,…,v q ；
Therefore, when the number of the fans is n 1 In time, the upper reservoir adjusts the storage capacity to select v respectively 1 ,v 2 ,…,v q Carrying out full-power frequency conversion extraction and storage and wind power combined power supply, respectively obtaining q power supply guarantee rates, which are expressed as: e.g. of the type 1 ,e 2 ,…,e q (ii) a The abscissa is used as power supply guarantee rate, the ordinate is used as upper reservoir adjustment storage capacity, q discrete points are drawn in a coordinate system, curve fitting is carried out on the q discrete points, and the number n of fans is obtained 1 A corresponding first curve;
in the same way, the number n of the fans is obtained 2 The corresponding second curve, \ 8230;, is equal to the number n of fans p The corresponding p curve;
for each curve, solving the inflection point of the curve, and performing curve fitting on the inflection points of the p curves to obtain an optimal configuration curve of the power supply guarantee rate, the upper reservoir regulation storage capacity and the number of fans;
and 1.2, knowing the target power supply guarantee rate, searching an optimal configuration curve to obtain the upper reservoir regulation storage capacity and the number of fans which are most matched with the target power supply guarantee rate.
In this step, the assembly capacity of the full-power variable-frequency pumping and storage unit is determined in the following manner:
in a calculation period, acquiring the power generation and water pumping requirements of each calculation time step on the full-power variable-frequency storage unit; counting the power generation and water pumping requirements of the full-power variable-frequency pumping and storing unit in each calculation time step to obtain the maximum value as the original installed capacity of the full-power variable-frequency pumping and storing unit;
then, gradually reducing the installed capacity of the full-power variable-frequency pumping and storing unit from the original installed capacity of the full-power variable-frequency pumping and storing unit, and calculating the power supply guarantee rate corresponding to each installed capacity to obtain a curve of the installed capacity and the power supply guarantee rate; and searching the installed capacity matched with the target power supply guarantee rate in the curve, and taking the searched installed capacity as the finally determined installed capacity of the full-power variable-frequency pumping and storing unit.
In the step, the installed capacity of the standby diesel power plant is determined in the following way:
in a calculation period, a standby diesel power plant is not started, a power supply notch of the system load of each calculation time step is obtained, the installed capacity of the standby diesel power plant corresponding to the power supply notch and the power supply guarantee rate of the calculation time step are obtained, and therefore a curve of the installed capacity and the power supply guarantee rate of the standby diesel power plant is drawn; in the curve, the installed capacity of the backup diesel power plant matched with the target power supply guarantee rate is searched for as the installed capacity of the backup diesel power plant which is finally determined.
Further, after determining the configuration parameters of the number of the fans in the wind power plant, the adjustment storage capacity of the upper reservoir, the assembly capacity of the full-power variable-frequency pump storage unit and the installed capacity of the standby diesel power plant, the method further comprises the following steps:
and further optimizing each configuration parameter, including: the comprehensive economic index of the combined power supply system is that the minimum total target of electric energy profit, coal saving benefit and investment cost in the optimization time interval is taken as a secondary target of reducing the storage capacity of the upper reservoir and the installed scale of the standby diesel power plant, so that the number of fans of the wind power plant, the adjusted storage capacity of the upper reservoir, the assembled capacity of the full-power frequency conversion pumping and storage unit and the installed capacity of the standby diesel power plant are finally determined.
Step 2, installing a full-power frequency conversion storage and wind power combined power supply optimization configuration system according to the optimal configuration parameters determined in the step 1, and in the system operation process, adopting the following strategies to carry out full-power frequency conversion storage and wind power combined power supply optimization:
step 2.1, regulating and controlling the wind power plant, wherein the method comprises the following steps:
step 2.1.1, collecting the total output power P of the wind power plant of the current calculation time step WP And system electrical load D of load system LS ；
Step 2.1.2, calculating to obtain the maximum allowable power P of the wind power directly connected to the power grid system by adopting the following formula max ：
P max ＝α*D LS
Wherein:
alpha is the wind power access proportion and is a system set value; alpha is less than or equal to 1, alpha is generally =0.1 for a large power grid, and alpha can be additionally determined as a large value after a storage power station is configured for a regional isolated power grid.
Step 2.1.3, maximum allowable power P of wind power directly connected to the power grid system is compared max Total output power P of wind farm WP If P is WP ≤P max Then the second control switch K2 is closed, and the first control switch K1 is completely opened, so that the wind power plant is totalOutput power P WP Completely conveying the power to the grid system;
if P WP ＞P max Then the first control switch K1 and the second control switch K2 are opened, and the total output power P of the wind power plant is converted into the total output power WP Maximum allowable power P in max Part of power is transmitted to the power grid system, and the rest output power is transmitted to a pumped water pump of the pumped storage power station to serve as one of electric energy sources of the pumped water pump of the pumped storage power station;
step 2.2, the full-power frequency conversion pumped storage power station is regulated and controlled, and the method comprises the following steps:
step 2.2.1, obtaining the upper reservoir water storage volume V of the current calculation time step according to the following formula e ：
Wherein:
V e0 upper reservoir water storage volume V for the previous calculation time step e0 ；
D PS Calculating the input power of the full-power variable-frequency pumping and storage unit in the current time step under the working condition of a water pump;
P HP calculating the output power of the full-power variable-frequency pumping and storing unit in the current time step under the power generation working condition;
delta t is the calculation time step of iterative calculation;
η P calculating the pumping comprehensive efficiency of the pumping water pump of the pumped storage power station at the current time step;
η T calculating the comprehensive power generation efficiency of the pumped storage power station generator set of the current time step;
γ w is water-heavy;
Z u calculating the upper reservoir water level of the current time step;
Z d calculating the water level of the lower reservoir at the current time step;
eta for full-power variable-frequency pumping and storage units P And η T Comprehensive calculation is required according to the water head and the rotating speed of the current calculation time step.
Step 2.2.2, setting the regulated storage capacity of the upper reservoir obtained in the step 1 as V min ,V max ]Wherein, V min Is the minimum value, V, allowed by the water storage volume of the upper reservoir max The maximum value allowed by the water storage volume of the upper reservoir;
comparing upper reservoir water storage volume V of current calculation time step e Regulating reservoir capacity with upper reservoir [ V ] min ,V max ]The relationship of (1):
if V e ＞V max Controlling the water pump of the pumped storage power station to stop pumping water;
if V e ＜V min Controlling the pumped storage power station generator set to stop generating electricity;
if V e ∈[V min ,V max ]Enabling a pumped water pump of the pumped storage power station to perform a normal pumping working condition, and enabling a generator set of the pumped storage power station to perform a normal power generation working condition;
step 2.3, regulating and controlling a standby diesel power plant, wherein the method comprises the following steps:
step 2.3.1, obtaining the output power P of the standby diesel power plant of the current calculation time step by adopting the following formula DP ：
P DP ＝D LS +D PS -P WP -P HP
Wherein:
D LS calculating the system electrical load of the current time step;
D PS calculating the input power of the full-power variable-frequency pumping and storing unit in the current time step under the working condition of a water pump;
P WP calculating the total output power of the wind power plant at the current time step;
P HP calculating the output power of the full-power variable-frequency pumping and storage unit in the current time step under the power generation working condition;
P DP calculating the output power of the standby diesel power plant of the current time step;
step 2.3.2, if the calculated output power P of the standby diesel power plant DP Is greater than 0, and is greater than the total weight of the rubber,make the standby diesel power plant according to P DP Transmitting electric energy to a power grid system; if the calculated output power P of the standby diesel power plant DP If the power is equal to 0, the standby diesel power plant is closed, so that the standby diesel power plant does not transmit electric energy to the power grid system;
therefore, the power supply conditions of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant are optimally controlled according to the system power load of the load system in the current calculation time step, and the system power load is met.
The invention provides a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and a method, which are characterized in that:
the power supply points of the full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system comprise a wind power plant, a full-power variable-frequency pumped storage power station and a standby diesel power plant. The three power supply points have the priority order of: the priority of the wind power plant is higher than that of a full-power variable-frequency pumped storage power station, and the priority of the full-power variable-frequency pumped storage power station is higher than that of a standby diesel power plant.
(1) Firstly, adopting a wind power plant to supply power
In order to ensure the power supply quality and stability, the output power of the wind power plant only allows direct access to part of the specific gravity bearing the system load, the rest of the load is transmitted to the pumped water pump of the pumped storage power station as energy, and pumped water of the pumped water pump of the pumped storage power station is converted into water energy to be stored in an upper reservoir, so that the full and effective utilization of the power generation of the wind power plant is realized.
Secondly, when the wind power plant generates electricity and can meet system load, only the wind power plant generates electricity, a standby diesel power plant is not started, and a full-power variable-frequency pumping and storing unit is also not started.
(2) Secondly, generating power for full-power frequency conversion pumping and storage unit
When the power generation of the wind power plant can not meet the system load, the full-power variable-frequency pumping and storage unit is started preferentially, and if the full-power variable-frequency pumping and storage unit and the wind power plant can jointly meet the system load, the power is supplied only through the full-power variable-frequency pumping and storage unit and the wind power plant, and a standby diesel power plant is not started; and if the full-power variable-frequency pump storage unit and the wind farm still cannot meet the system load requirement, starting the standby diesel power plant.
(3) Last start-up of a standby diesel power plant
When the full-power variable-frequency pumping unit and the wind farm still cannot meet the system load requirement, the standby diesel power plant is started again and is started to operate as a standby power supply.
Therefore, the wind power renewable energy source is used as a main power source in the operation mode, the full-power variable-frequency pumped storage unit can play the roles of frequency modulation, voltage regulation, peak regulation and accident standby under the working conditions of power generation and water pumping, and can be used as rotary standby or reactive compensation when power generation or water pumping is not performed; the standby diesel power plant is only started when the pumping unit is full but there is still a power gap.
In the invention, for the full-power variable-frequency pumping and storage unit, the input power of the water pump turbine can be adjusted by automatically tracking the frequency change, so that the corresponding frequency automatic control capacity is provided for the power system; the water pump can also be operated by reducing the rotating speed, so that the input power of the water pump can be greatly reduced. In addition, under the condition that the shaft power of the water turbine is kept unchanged, the full-power frequency converter unit can realize decoupling control and independent adjustment of active power output and reactive power output through the full-power frequency converter, so that the full-power frequency converter unit has a function of inhibiting unstable phenomena such as voltage instability, low-frequency oscillation and the like, and the stable control capability of a system is improved.
The invention provides a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system and a method, which have the following advantages:
by optimizing power generation regulation and control of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant and setting the optimal configuration parameters of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant, the wind energy utilization rate can be effectively improved, the power supply quality of a power grid is effectively guaranteed, and the wind energy resources are developed and utilized to the maximum extent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and adaptations can be made without departing from the principle of the present invention, and such modifications and adaptations should also be considered to be within the scope of the present invention.
Claims (7)
1. A full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system is characterized by comprising a wind power plant, a full-power variable-frequency pumped storage power station, a standby diesel power plant, a control system and a load system; the full-power variable-frequency pumped storage power station comprises a full-power variable-frequency pumped storage unit, an upper reservoir and a lower reservoir; the full-power variable-frequency pumping and storage unit comprises a pumped storage power station generator set and a pumped storage power station pumped water pump;
a first power supply line of the wind farm is connected to a power grid via a limiting element; a second power supply circuit of the wind power plant is connected to the power utilization end of the pumped storage power station pumped water pump; the standby diesel power plant is connected to the power grid through a third power supply line; the power generation end of the pumped storage power station generator set is connected to the power grid through a fourth power supply circuit; the pumped storage power station generator set is arranged between the upper reservoir and the lower reservoir; the power transmission end of the power grid is connected to the power utilization end of the load system through a fifth power supply line; the power transmission end of the power grid is connected to the pumped storage power station pumped water pump through a sixth power supply line; the pumped water pump of the pumped storage power station is used for conveying water in the lower reservoir to the upper reservoir;
the control system is respectively connected with the wind power plant, the full-power variable-frequency pumped storage power station, the standby diesel power plant and the load system.
2. The full-power variable-frequency pumped storage and wind power combined power supply optimal configuration system according to claim 1, characterized in that the first power supply line is provided with a first control switch (K1); a second control switch (K2) is arranged on the second power supply line; the third power supply line is provided with a third control switch (K3); a fourth control switch (K4) is arranged on the fourth power supply line; and a fifth control switch (K5) is arranged on the sixth power supply line.
3. The method for optimizing the configuration system of the full-power variable-frequency pumped storage and wind power combined power supply according to any one of claims 1 to 2 is characterized by comprising the following steps of:
step 1, determining the optimal configuration parameters of a full-power frequency conversion pumped storage and wind power combined power supply optimal configuration system, comprising the following steps of: the number of fans of the wind power plant, the adjustment storage capacity of an upper reservoir, the assembly capacity of a full-power variable-frequency pump storage unit and the installed capacity of a standby diesel power plant;
step 2, installing a full-power frequency conversion pumping storage and wind power combined power supply optimization configuration system according to the optimal configuration parameters determined in the step 1, and performing full-power frequency conversion pumping storage and wind power combined power supply optimization by adopting the following strategies in the system operation process:
step 2.1, regulating and controlling the wind power plant, wherein the method comprises the following steps:
step 2.1.1, collecting the total output power P of the wind power plant at the current calculation time step WP And system electrical load D of load system LS ；
Step 2.1.2, calculating to obtain the maximum allowable power P of the wind power directly connected to the power grid system by adopting the following formula max ：
P max ＝α*D LS
Wherein:
alpha is the wind power access specific gravity and is a system set value;
step 2.1.3, maximum allowable power P of wind power directly connected to the power grid system is compared max Total output power P of wind farm WP If P is WP ≤P max Then the second control switch (K2) is closed, and the first control switch (K1) is completely opened, so that the total output power P of the wind power plant WP Completely conveying the power to the grid system;
if P WP ＞P max Then the first control switch (K1) and the second control switch (K2) are opened, and the total output power P of the wind power plant is converted into the total output power WP Maximum allowable power P in max Part of power is transmitted to the power grid system, and the rest output power is transmitted to pumped storage powerThe station water pump is used as one of electric energy sources of the water pump of the pumped storage power station;
step 2.2, the full-power frequency conversion pumped storage power station is regulated and controlled, and the method comprises the following steps:
step 2.2.1, obtaining the upper reservoir water storage volume V of the current calculation time step according to the following formula e ：
Wherein:
V e0 upper reservoir water storage volume V for the previous calculation time step e0 ；
D PS Calculating the input power of the full-power variable-frequency pumping and storage unit in the current time step under the working condition of a water pump;
P HP calculating the output power of the full-power variable-frequency pumping and storing unit in the current time step under the power generation working condition;
delta t is the calculation time step of iterative calculation;
η P calculating the pumping comprehensive efficiency of the pumping water pump of the pumped storage power station at the current time step;
η T calculating the comprehensive power generation efficiency of the pumped storage power station generator set of the current time step;
γ w is water heavy;
Z u calculating the upper reservoir water level of the current time step;
Z d calculating the water level of the lower reservoir of the current time step;
step 2.2.2, setting the regulated storage capacity of the upper reservoir obtained in the step 1 as [ V ] min ,V max ]Wherein, V min Is the minimum value, V, allowed by the water storage volume of the upper reservoir max The maximum value allowed by the water storage volume of the upper reservoir;
comparing upper reservoir water storage volume V of current calculation time step e Regulating reservoir capacity with upper reservoir [ V ] min ,V max ]The relationship of (1):
if V e ＞V max Then the pumped water pump of the pumped storage power station is controlledStopping pumping water;
if V e ＜V min Controlling the pumped storage power station generator set to stop generating electricity;
if V e ∈[V min ,V max ]Enabling a pumped water pump of the pumped storage power station to perform a normal pumping working condition, and enabling a generator set of the pumped storage power station to perform a normal power generation working condition;
step 2.3, regulating and controlling a standby diesel power plant, wherein the method comprises the following steps:
step 2.3.1, obtaining the output power P of the standby diesel power plant of the current calculation time step by adopting the following formula DP ：
P DP ＝D LS +D PS -P WP -P HP
Wherein:
D LS calculating the system power load of the current time step;
D PS calculating the input power of the full-power variable-frequency pumping and storing unit in the current time step under the working condition of a water pump;
P WP calculating the total output power of the wind power plant at the current time step;
P HP calculating the output power of the full-power variable-frequency pumping and storage unit in the current time step under the power generation working condition;
P DP calculating the output power of the standby diesel power plant of the current time step;
step 2.3.2, if the calculated output power P of the standby diesel power plant DP If the power is more than 0, the standby diesel power plant is enabled to be in accordance with P DP Transmitting electric energy to a power grid system; if the calculated output power P of the standby diesel power plant DP If the power is equal to 0, the standby diesel power plant is closed, so that the standby diesel power plant does not transmit electric energy to the power grid system;
therefore, the power supply conditions of the wind power plant, the full-power variable-frequency pumped storage power station and the standby diesel power plant are optimally controlled according to the system power load of the load system in the current calculation time step, and the system power load is met.
4. The method for optimizing the configuration system of the full-power variable-frequency pumped storage and wind power combined power supply according to claim 3, wherein in the step 1, the number of the wind turbines in the wind farm is determined by the following method:
step 1.1, determining the number of fans as n in a configuration research stage for a full-power variable-frequency extraction and storage and wind power combined power supply optimization configuration system 1 ,n 2 ,…,n p (ii) a Determining the regulated storage capacity v of the upper reservoir 1 ,v 2 ,…,v q ；
Therefore, when the number of the fans is n 1 In time, the upper reservoir adjusts the storage capacity to select v respectively 1 ,v 2 ,…,v q And performing full-power frequency conversion pumped storage and wind power combined power supply, and respectively obtaining q power supply guarantee rates, which are expressed as: e.g. of the type 1 ,e 2 ,…,e q (ii) a Using the abscissa as the power supply guarantee rate and the ordinate as the upper reservoir adjustment storage capacity, drawing q discrete points in a coordinate system, and performing curve fitting on the q discrete points to obtain the number n of fans 1 A corresponding first curve;
in the same way, the number n of the fans is obtained 2 The corresponding second curve, \8230;, n corresponding to the number of fans p The corresponding p-th curve;
for each curve, solving the inflection point of the curve, and performing curve fitting on the inflection points of the p curves to obtain an optimal configuration curve of the power supply guarantee rate, the upper reservoir regulation storage capacity and the number of fans;
and 1.2, knowing the target power supply guarantee rate, searching an optimal configuration curve to obtain the upper reservoir regulation storage capacity and the number of fans which are most matched with the target power supply guarantee rate.
5. The method for optimizing the configuration system of the full-power frequency conversion pumping storage and wind power combined power supply according to claim 3, wherein in the step 1, the assembly capacity of the full-power frequency conversion pumping storage unit is determined by the following method:
in a calculation period, acquiring the power generation and water pumping requirements of each calculation time step on the full-power variable-frequency storage unit; counting the power generation and water pumping requirements of the full-power variable-frequency pumping and storing unit in each calculation time step to obtain the maximum value as the original installed capacity of the full-power variable-frequency pumping and storing unit;
then, gradually reducing the installed capacity of the full-power variable-frequency pumping and storing unit from the original installed capacity of the full-power variable-frequency pumping and storing unit, and calculating the power supply guarantee rate corresponding to each installed capacity to obtain a curve of the installed capacity and the power supply guarantee rate; and searching the installed capacity matched with the target power supply guarantee rate in the curve to be used as the finally determined installed capacity of the full-power variable-frequency pumping and storage unit.
6. The method for optimizing the configuration system of the full-power frequency conversion pumping storage and wind power combined power supply according to claim 3, wherein in the step 1, the installed capacity of the standby diesel power plant is determined by:
in a calculation period, a standby diesel power plant is not started, a power supply notch of a system load of each calculation time step is obtained, the installed capacity of the standby diesel power plant corresponding to the power supply notch and the power supply guarantee rate of the calculation time step are obtained, and therefore a curve of the installed capacity and the power supply guarantee rate of the standby diesel power plant is drawn; in the curve, the installed capacity of the standby diesel power plant matched with the target power supply guarantee rate is searched for and used as the finally determined installed capacity of the standby diesel power plant.
7. The method for optimizing the configuration system of the full-power frequency conversion pumping storage and wind power combined power supply according to claim 3, wherein after configuration parameters of the number of fans of the wind power plant, the adjustment storage capacity of the upper reservoir, the assembly capacity of the full-power frequency conversion pumping storage unit and the installed capacity of the standby diesel power plant are determined, the method further comprises the following steps:
and further optimizing each configuration parameter, including: the comprehensive economic index of the combined power supply system is that the minimum total target of electric energy profit, coal saving benefit and investment cost in the optimization time interval is taken as a secondary target of reducing the storage capacity of the upper reservoir and the installed scale of the standby diesel power plant, so that the number of fans of the wind power plant, the adjusted storage capacity of the upper reservoir, the assembled capacity of the full-power frequency conversion pumping and storage unit and the installed capacity of the standby diesel power plant are finally determined.
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