CN202333800U - Power adjusting system of wind farm large scale energy storage power station - Google Patents
Power adjusting system of wind farm large scale energy storage power station Download PDFInfo
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- CN202333800U CN202333800U CN 201120275550 CN201120275550U CN202333800U CN 202333800 U CN202333800 U CN 202333800U CN 201120275550 CN201120275550 CN 201120275550 CN 201120275550 U CN201120275550 U CN 201120275550U CN 202333800 U CN202333800 U CN 202333800U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a power adjusting system of a wind farm large scale energy storage power station, characterized by comprising a battery management unit, a bidirectional current transformer, a grid connected access device, a power controller and an energy storage power station monitoring system. The battery management unit and the bidirectional current transformer are accessed a battery system, the power controller is connected with the bidirectional current transformer and the battery management unit, the energy storage power station monitoring system is connected with the power controller, and the grid connected access device is connected with the bidirectional current transformer. By using the power adjusting system of the wind farm large scale energy storage power station of the utility model to control the wind farm large scale energy storage power station, the wind farm voltage is stable, the power output of a wind turbine or the wind farm is smooth, the power grid security of the area to which the wind farm belongs and the power supply reliability and flexibility are improved, and renewable energy sources are utilized fully.
Description
Technical Field
The utility model relates to a large-scale energy storage power station control system of wind-powered electricity generation field and control method are particularly useful for the less or wind-powered electricity generation installed capacity of electric wire netting and account for the great region of electric wire netting total installed capacity proportion.
Background
With the rapid increase of social energy demand and the increasingly prominent climate and environmental problems, the support of renewable energy is increased in all countries, wind energy is rapidly developed by the advantages of being renewable, clean and pollution-free, and relatively low in power generation cost, and the total installed capacity of a wind turbine generator and the scale of a wind power plant are rapidly enlarged. However, the influence of the wind power plant on the operation stability and reliability of the power grid is increasingly prominent, and the difficulty of power grid dispatching is greatly increased. The main performance is as follows:
(1) the wind power output has strong randomness and obvious intermittence. The wind power output fluctuation range is large, and the fluctuation frequency is irregular. The wind power intermittent and random increases the load of power grid frequency modulation
(2) With the access of a large-scale wind power plant to a power grid, the control of the operating voltage of part of the power grid is difficult. The wind power plant operation excessively depends on the reactive compensation of the system, and the flexibility of the power grid operation is also limited.
(3) The single machine capacity of the wind turbine generator is small, and the wind power generation components are increased, so that the inertia of the system is reduced under the same load level, and the dynamic stability level of a power grid is influenced; and the anti-peak regulation characteristic of the wind power increases the difficulty of peak regulation of the power grid.
The contradiction between the continuous increase of the wind power grid-connected capacity and the operation safety of the power grid causes that the power grid cannot fully acquire wind power electric quantity, and measures for limiting wind power output are taken in necessary sections to ensure the safe and stable operation of the power grid. With the further expansion of the wind power access scale, the contradiction is more prominent.
Disclosure of Invention
Utility model purpose: the utility model provides a large-scale energy storage power station power regulation method of wind-powered electricity generation field and system mainly solve wind-powered electricity generation power output unstable, uncontrollable and the predictability poor with the direct contradiction of electric wire netting dispatch, improve the wind-powered electricity generation field voltage fluctuation problem that leads to from this.
The technical scheme is as follows: the utility model discloses a realize through following technical scheme:
the utility model provides a large-scale energy storage power station power governing system of wind-powered electricity generation field which characterized in that: the system comprises a battery management unit, a bidirectional converter, a grid-connected access device, a power controller and an energy storage power station monitoring system; the battery management unit and the bidirectional converter are connected into a battery system, the power controller is connected to the bidirectional converter and the battery management unit, the energy storage power station monitoring system is connected to the power controller, and the grid-connected access device is connected with the bidirectional converter.
The grid-connected access device is connected with an alternating current bus of the wind power plant when in use, and the energy storage power station monitoring system is connected with an Ethernet of the wind power plant when in use.
The advantages and effects are as follows:
the utility model provides a power regulating system of a large-scale energy storage power station of a wind power plant, which implements a power smooth active control method and a voltage stable reactive power control method of the large-scale energy storage power station;
can alleviate above-mentioned problem at the extensive energy storage power station of wind-powered electricity generation field construction to a great extent, the utility model discloses a main task lies in providing a large-scale energy storage power station power governing system of wind-powered electricity generation field and method, through adjusting energy storage power station active and reactive power in real time, carries out the peak-load that disappears and fills valley, smooth power, stabilizes wind field voltage. The large-scale energy storage power station power regulation system of wind-powered electricity generation field includes: the system comprises battery management, a bidirectional converter, a grid-connected access device, a power controller and monitoring software.
In order to reduce the influence of wind power on the operation of a power grid, the active and reactive power regulation and low voltage ride through capability of the wind turbine generator are improved on the one hand. Meanwhile, certain measures are taken, the predictability of the power of the wind power plant is improved by means of building an energy storage power station and the like, the power fluctuation is reduced, the direct rigid connection between the wind power plant and a power grid is changed into flexible connection, and the influence of the wind power plant on the power grid is solved.
The utility model discloses control the extensive energy storage power station in wind-powered electricity generation field, can stabilize wind power field voltage, level and smooth wind turbine generator system (wind-powered electricity generation field) power output improves security, the reliability of power supply and the flexibility of the regional electric wire netting in wind-powered electricity generation field place, make full use of renewable energy.
Description of the drawings:
FIG. 1 is a block diagram of a topology structure of a large-scale energy storage system of a wind farm;
FIG. 2 is a schematic diagram of the power conditioning system of the present invention;
fig. 3 is a structural block diagram of a bidirectional converter in the present invention;
FIG. 4 is a diagram of the power regulation control method of the present invention;
FIG. 5 is a schematic block diagram of a large-scale energy storage power station monitoring system for a wind power plant according to the present invention;
fig. 6 is a block diagram schematically illustrating the structure of the power conditioning system of the present invention.
The specific implementation mode is as follows: the invention will be further explained with reference to the drawings:
the utility model provides a power regulation method and system for a large-scale energy storage power station of a wind power plant, wherein the method comprises a power smooth active control method and a voltage stable reactive power control method of the large-scale energy storage power station; the method comprises the following specific steps:
the power smooth active control method comprises the following steps:
wind energy is converted into electric energy through a wind driven generator, and the output power of a wind turbine is caused by the continuous change of the wind speedP wAccording to the changed frequency range, the output of the wind turbine can be adjustedP wThree parts: a high frequency region (1Hz or higher), a low frequency region (0.01Hz or lower), and an intermediate frequency region therebetween. Partial power fluctuation of the high-frequency area is absorbed by the rotor inertia of the generator; the power fluctuation of the intermediate frequency region is the most serious influence on the connected power grid and is the part of the energy storage device to be stabilized. Because of the stabilization of the rotor inertia to the power in the high frequency region, the output power of the generatorP wOnly in the intermediate frequency region and the low frequency region. There is therefore a power allocation relationship of the following formula:
the power regulation controller of the large-scale energy storage power station of the wind power plant controlsP essRegulating power at wind farm outletP gThe purpose of smoothing the power fluctuation of the wind power plant is achieved. Control targetP gThe method can be determined in two ways, namely that the power grid dispatching system is determined by combining the power grid load according to the predicted value of the wind power prediction system of the wind power plant. The other mode is that the control target is obtained by filtering the real-time power of the wind turbine generator measured by the wind power plantP gThe specific parameters of the filter are determined according to actual conditions.
The specific method comprises the following steps: (1) determining a control target of the outlet power of the whole wind power plant; there are two ways to determine this goal: one is that the power grid dispatching system combines the power grid load to determine according to the predicted value of the wind power prediction system of the wind power plant; the other mode is that the control target is obtained by filtering the real-time power of the wind turbine generator measured by the wind power plant；
(2) Controlling the power output by the energy storage power station by adopting an error feedback control method;
(3) adjusting the output power of the energy storage power station to control according to the output power changes of the intermediate frequency area and the low frequency area of the generator, so that the output power of the energy storage power station is kept smooth by matching with the output power changes of the intermediate frequency area and the low frequency area of the generator;
the voltage stabilization reactive power control method comprises the following steps:
the reactive power control of energy storage power stations aims at stabilizing voltage, and two different modes are provided for voltage and reactive power control according to different working conditions. One is that in case of a grid fault, a fast control voltage support is needed to avoid voltage collapse. And secondly, reactive power is controlled under the normal operation condition, voltage distribution is improved, and the quality of electric energy is ensured.
The specific operation is as follows:
firstly, determining an active power control parameter according to the capacity of an energy storage power station, the installed capacity of a wind power plant unit and a power grid parameter;
secondly, determining a reactive power control period according to the power grid requirement and the response time of the energy storage power station converter;
measuring the error of the given voltage and the actually measured voltage;
and fourthly, combining the results obtained in the steps to control according to the following method:
wherein,K qin order to control the parameters of the active power,T qis an active power control period.
The error of the voltage is given and measured for the voltage.
The S is a time constant and generally takes a value of 0.02-0.05.
The error feedback control method in the "(2)" step comprises the following specific steps:
(1) determining active power control parameters, active power control periods, power control targets and errors of measured power;
(2) and performing the following operations according to the obtained data:
wherein,P essis the power output by the energy storage power station,K pin order to control the parameters of the active power,T pis an active power control period.
S is a time constant for the error of the power control target and the measured power. And a band-pass filter is added in a feedback channel, and limited power regulation is only used for compensating fluctuation of the power in a middle frequency region and a low frequency region.
There are two different ways for the voltage stable reactive power control method. One is that in case of a grid fault, a fast control voltage support is needed to avoid voltage collapse. And secondly, reactive power is controlled under the normal operation condition, voltage distribution is improved, and the quality of electric energy is ensured.
The large-scale energy storage power station realizes a power smooth active control method and a voltage stable reactive power control method through decoupling control of a bidirectional converter, and the decoupling control method comprises the following steps:
the AC/DC (alternating current-direct current conversion) adopts a voltage source commutation technology based on the IGBT, and the voltage relation under a dq rotation coordinate system is as follows:
the active power and the reactive power are:
wherein:P、Qactive power and reactive power output by the converter;u d、u qd and q axis components of the alternating side voltage of the converter;i d、i qd and q axis components of the alternating side current of the converter;e d、e qd and q axis components of the power grid voltage;L、Ris the interior of the converterThe inductance and the resistance of (1); p is a differential operator. According to the principle of q-axis orientation of AC voltage, thenu d=0，u q=us, thereby makingP、QAnd realizing decoupling control.
In addition, the utility model also provides a wind-powered electricity generation field large-scale energy storage power station power governing system, this system includes battery management unit, bidirectional converter, and the access device that is incorporated into the power networks, power controller and energy storage power station monitored control system; the battery management unit and the bidirectional converter are connected into a battery system, the power controller is connected to the bidirectional converter and the battery management unit, the energy storage power station monitoring system is connected to the power controller, and the grid-connected access device is connected with the bidirectional converter.
The grid-connected access device is connected with an alternating current bus of the wind power plant when in use, and the energy storage power station monitoring system is connected with an Ethernet of the wind power plant when in use.
The battery management part is used for monitoring, evaluating and protecting the electronic equipment set of the battery running state, and comprises: monitoring and transmitting real-time running state information of the battery and the battery pack, such as battery voltage, current, temperature, protection amount and the like; evaluating and calculating the SOC of the battery, the accumulated processing energy of the battery and the like; protecting the safety of the battery, and the like. Imbalance occurs in the running process of the battery or the battery pack, the imbalance has strong randomness, and the maximum allowable discharge current, the discharge depth and the like of each battery pack are calculated according to the running state data of the battery and the predicted SOC value of the battery.
The bidirectional converter completes the functions of battery charge and discharge power control, power factor regulation, protection and the like, and is an important component of the energy storage power station. The active and reactive power outputs of the battery can be controlled according to the power regulation controller instructions. In the power regulation process, the bidirectional converter can receive and track and execute a power given control signal in real time, and automatically regulate active power output according to signals such as grid-connected side voltage and an energy storage power station monitoring system control instruction, so that the maximum output power and the power change rate of the bidirectional converter are not more than a given value, and the stability of a power system is ensured under the conditions of power grid faults and special operation modes. The converter has direct current overvoltage protection, overcurrent protection, input reverse connection protection, short circuit protection, grounding protection (with fault detection function), undervoltage/overvoltage protection, overload protection, overheat protection, over/under-frequency protection, three-phase unbalance protection and alarm, phase protection and ground resistance monitoring and alarm functions.
And the power controller controls the power of the energy storage power station according to the measurement of the output power of the wind turbine generator or the wind power plant given by referring to the power grid dispatching system or the wind power plant wind power prediction system. And the power regulation controller regulates the active power of the energy storage power station according to the real-time data output by the power of the wind power station so as to smooth the fluctuation of the total active power of the wind power station. And the reactive output can be tracked and adjusted in real time according to the voltage measurement value of the alternating current side and the control instruction signal of the wind power plant or the power grid dispatching system, and the parameters of the adjusting mode, the reference voltage, the voltage adjusting rate, the power factor and the like can be set remotely by the energy storage power station monitoring system.
In order to comprehensively consider the influence of factors such as wind power fluctuation, power grid load and faults caused by wind speed change, a large-scale energy storage power station of a wind power plant is generally arranged at a wind turbine generator gathering end of a substation of the wind power plant, namely the low-voltage side of a main transformer, and power regulation control is performed by closed-loop control according to the voltage, active power and power factor measured values of the end points. Active power and reactive power are independently controlled after the decoupling of the converter, and the active power adjustment mainly enables the output power of the wind power plant to be close to a scheduling given value or a predicted value as much as possible, so that the output predictability of the wind power plant is improved, and the wind power fluctuation of the wind power plant is smoothed; the reactive power regulation mainly stabilizes the wind power field voltage and improves the operation stability of the power grid.
The energy storage power station monitoring system can receive an instruction from the wind power plant monitoring system or the power grid dispatching system, and set or adjust the running state and the running mode of the battery energy storage system; the system comprises a monitoring device and a communication device. The communication mode of the energy storage power station monitoring system adopts optical fiber Ethernet, the local monitoring system has the functions of remote measurement, remote control and remote signaling, the battery, the converter and other auxiliary equipment are comprehensively and perfectly monitored, the running state and working parameters of related equipment are collected in real time and uploaded to the energy storage power station monitoring system, the system data are transmitted in real time, and the running state information of the system can be refreshed every 1 s. And the fault information is stored and transmitted in real time, and a communication port of the energy storage power station monitoring system is reserved. Meanwhile, the monitoring system can also store running logs and events of the system, and perform functions of historical database maintenance and query and the like. The in-situ monitoring device also needs to have a telecontrol function, transmit real-time data in the battery energy storage system to the energy storage power station monitoring system, and receive a remote control command of the energy storage power station monitoring system.
Referring to fig. 1, the utility model discloses be responsible for in the extensive energy storage power station of wind-powered electricity generation field and wind power field dispatch or power prediction system communication, carry out the active and reactive power real time control of energy storage power station according to the scheduling instruction to accomplish control and the balanced management to the battery. The system comprises: the system comprises battery management, a bidirectional converter, a grid-connected access device, a power controller and monitoring software, wherein the bidirectional converter and the battery can be divided into a plurality of units according to capacity. The system is connected with the wind power plant dispatching system through an Ethernet (104 protocol), and the inside communication of the system adopts a canopen bus.
Referring to fig. 2, a 0.69kv alternating current bus of a large-scale energy storage power station power regulation system of a wind farm is connected with the 35kv side of a main step-up transformer of the wind farm through a breaker and a transformer, and the specification of the transformer is 0.69/35 kv. The wind power field wind power measurement sensor is arranged at the whole wind power field and comprises a wind motor group and an energy storage power station power grid access end.
Referring to fig. 4, after power decoupling control is performed by the bidirectional converter, active power control and reactive power control are performed according to an active power given target and a voltage given target respectively.
Referring to fig. 5, the monitoring system runs in a monitoring room server, and each PC is connected with the server through a client, so that functions of browsing real-time running data, event recall, historical data query, statistics and the like of a large-scale energy storage power station of a wind power plant are realized.
The utility model discloses control the extensive energy storage power station in wind-powered electricity generation field, can stabilize wind power field voltage, the power output of level and smooth wind turbine generator system or wind-powered electricity generation field improves security, the reliability of power supply and the flexibility of the regional electric wire netting in wind-powered electricity generation field place, make full use of renewable energy.
Claims (2)
1. The utility model provides a large-scale energy storage power station power governing system of wind-powered electricity generation field which characterized in that: the system comprises a battery management unit, a bidirectional converter, a grid-connected access device, a power controller and an energy storage power station monitoring system; the battery management unit and the bidirectional converter are connected into a battery system, the power controller is connected to the bidirectional converter and the battery management unit, the energy storage power station monitoring system is connected to the power controller, and the grid-connected access device is connected with the bidirectional converter.
2. The wind farm large scale energy storage plant power conditioning system of claim 1, characterized in that: the grid-connected access device is connected with an alternating current bus of the wind power plant when in use, and the energy storage power station monitoring system is connected with an Ethernet of the wind power plant when in use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201120275550 CN202333800U (en) | 2011-08-01 | 2011-08-01 | Power adjusting system of wind farm large scale energy storage power station |
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| CN 201120275550 CN202333800U (en) | 2011-08-01 | 2011-08-01 | Power adjusting system of wind farm large scale energy storage power station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001311A (en) * | 2012-11-08 | 2013-03-27 | 珠海泰坦科技股份有限公司 | Energy-storage emergency direct- and alternating-current power supply system |
| CN103475027A (en) * | 2013-09-22 | 2013-12-25 | 国家电网公司 | Wind farm and junction station time series coordination control method during concentrated wind power access |
| CN104393607A (en) * | 2014-11-25 | 2015-03-04 | 广东易事特电源股份有限公司 | Power stabilizing method and device for micro-grid system grid-connected node |
| CN110224436A (en) * | 2019-06-25 | 2019-09-10 | 湖南华大电工高科技有限公司 | A kind of novel wind power energy-accumulating power station topological structure |
-
2011
- 2011-08-01 CN CN 201120275550 patent/CN202333800U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001311A (en) * | 2012-11-08 | 2013-03-27 | 珠海泰坦科技股份有限公司 | Energy-storage emergency direct- and alternating-current power supply system |
| CN103001311B (en) * | 2012-11-08 | 2015-09-16 | 珠海泰坦科技股份有限公司 | Energy storage type is met an urgent need supplied by AC/DC electricity system |
| CN103475027A (en) * | 2013-09-22 | 2013-12-25 | 国家电网公司 | Wind farm and junction station time series coordination control method during concentrated wind power access |
| CN103475027B (en) * | 2013-09-22 | 2015-05-27 | 国家电网公司 | Wind farm and junction station time series coordination control method during concentrated wind power access |
| CN104393607A (en) * | 2014-11-25 | 2015-03-04 | 广东易事特电源股份有限公司 | Power stabilizing method and device for micro-grid system grid-connected node |
| CN104393607B (en) * | 2014-11-25 | 2016-08-24 | 广东易事特电源股份有限公司 | The power of the grid-connected node of micro-grid system stabilizes method and device |
| CN110224436A (en) * | 2019-06-25 | 2019-09-10 | 湖南华大电工高科技有限公司 | A kind of novel wind power energy-accumulating power station topological structure |
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