CN102624034B - Wind power station dispatching fit type idle work operation method suitable for high voltage power grid - Google Patents

Wind power station dispatching fit type idle work operation method suitable for high voltage power grid Download PDF

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CN102624034B
CN102624034B CN201210087401.6A CN201210087401A CN102624034B CN 102624034 B CN102624034 B CN 102624034B CN 201210087401 A CN201210087401 A CN 201210087401A CN 102624034 B CN102624034 B CN 102624034B
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voltage
wind farm
reactive power
wind
power
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CN102624034A (en
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张勇军
王孟邻
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South China University of Technology SCUT
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Abstract

本发明提供适用于高压电网的风电场调度配合型无功运行方法，该方法在电力调度和风电场无功控制系统之间增加接口，使电力调度的调压需求能够转换为风电场的无功控制指令，从而使风电场有目的地参与主动调压，避免了目前风电场无功运行的随机性和无目的性，能够有效的抑制电压波动，降低了电压调度决策难度。用以解决高压电网在风电场并网期间，风电场接入点及其附近电网节点的电压调控问题。本发明改善了当前风电场无功功率运行与电网调压缺少配合的情况，实现了风电场基于实际电网特点和运行需要的主动调压，使电网能够接纳更多的清洁风能发电。同时，该方法原理简单、易操作，投资少，实现难度不高，能够得到有效地推广。

The invention provides a reactive power operation method suitable for wind farm dispatching in high-voltage power grids. The method adds an interface between power dispatching and wind farm reactive power control systems, so that the voltage regulation demand of power dispatching can be converted into wind farm reactive power. Control commands, so that the wind farm can participate in active voltage regulation purposefully, avoiding the randomness and purposelessness of the current reactive power operation of the wind farm, effectively suppressing voltage fluctuations, and reducing the difficulty of voltage scheduling decisions. It is used to solve the voltage regulation problem of the wind farm access point and its nearby grid nodes when the high-voltage power grid is connected to the wind farm. The invention improves the lack of cooperation between the reactive power operation of the wind farm and the voltage regulation of the power grid, realizes the active voltage regulation of the wind farm based on the characteristics of the actual power grid and the operation needs, and enables the power grid to accept more clean wind power generation. At the same time, the method is simple in principle, easy to operate, requires less investment, is not difficult to implement, and can be effectively promoted.

Description

Be applicable to the idle operation method of wind energy turbine set scheduling fitting-type of high-voltage fence
Technical field
The present invention relates to the idle operation method of electric power system, particularly a kind of idle operation of the grid-connected wind energy turbine set of high pressure and control method of being applicable to.
Background technology
Along with going deep into of intelligent grid construction, distributed power generation replaces the generation modes such as original little thermoelectricity, diesel engine just gradually, and is expected to substitute a part of traditional firepower and hydroelectric power generation.Distributed power generation, in one of trend of China, is grid-connected gradually to the grid-connected development of extensive voltage levels by original low capacity low-voltage-grade.Meanwhile, the addressing of distributed power generation is also gradually by inland even deep-sea regional development to coastal waters.In China, offshore wind farm has become one of emphasis that distributed power generation further develops.Yet when bringing clean energy resource electric power for electrical network, distributed power generation has also brought some negative effects.Wherein, the operation that the batch-type distributed power generations such as wind-powered electricity generation, solar power generation are electrical network has brought more uncertainty, and to the traffic control of electrical network, security of operation has proposed stern challenge.
Wind energy turbine set is idle operation and voltage-regulation are that one of problem of paying close attention to is most dispatched in current operation of power networks.China is the GB GB/T 19963-2011 < < wind energy turbine set access power system technology regulation > > (hereinafter referred " GB ") of issue in 2011 about wind farm grid-connected national standard.GB requires wind energy turbine set should utilize the idle regulating power of self as far as possible, configure if desired reactive-load compensation equipment to guarantee to meet the part or all of reactive requirement of wind energy turbine set self, primary substation and line attachment, keep grid-connected point voltage to meet line voltage service requirement simultaneously.In addition, GB also require double-fed that wind energy turbine set installs and direct driving speed-changing blower fan power factor should leading 0.95～lag behind dynamically adjustable between 0.95.Can find out, China's GB regulation is slightly aobvious loose, flexibility during wind energy turbine set operation is high, but the idle output that simultaneously also makes wind energy turbine set has very large uncertain and without purpose, reactive voltage operation to electrical network can not be played autotelic supporting role, has increased the difficulty of line voltage scheduling decision simultaneously.
The present invention is incorporated into the idle in service of wind energy turbine set the decision-making of voltage of power scheduling by increasing the form of interface, thereby make wind energy turbine set can coordinate voltage scheduling line voltage to be monitored in real time to and participated in initiatively pressure regulation, contribute to improve voltage fluctuation problem and scheduling decision difficulty under wind farm grid-connected, make electrical network can receive more clean wind power generation.
Summary of the invention
In order to solve the voltage scheduling difficulty under wind farm grid-connected, suppress voltage ripple of power network, make electrical network can receive more wind power generation, the present invention proposes and be applicable to the idle operation of the grid-connected wind energy turbine set of high pressure and control method.The method increases interface between power scheduling and wind energy turbine set powerless control system, make the pressure regulation demand of power scheduling can be converted to the idle control command of wind energy turbine set, thereby make wind energy turbine set on purpose participate in initiatively pressure regulation, avoided the randomness of the idle operation of current wind energy turbine set and without purpose, can effectively suppress voltage fluctuation, reduce voltage scheduling decision difficulty.
The idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence, comprises the following steps:
(1) the power scheduling parameters of wind energy turbine set scheduling fitting-type interface in the time period that sets objectives: first, power scheduling is for the Net Frame of Electric Network of current slot, by maintenance, load constant meritorious constant with wind energy turbine set, and change that wind energy turbine set is idle exerts oneself, calculate the voltage variety of wind energy turbine set access point and the ratio of wind energy turbine set output reactive power variable quantity, i.e. the voltage influence factor K of wind energy turbine set reactive power in the idle operational objective time period; Secondly, provide the working voltage scope [V of wind energy turbine set min, V max], again, according to voltage security of operation, needing or economic pressure regulation needs, the object run voltage V of wind energy turbine set in the idle operational objective time period is formulated in scheduling obj, and the wind energy turbine set minimum pressure regulation ability Δ V that should have min, maximum pressure regulation ability Δ V max; Finally, determine the idle allocation model of wind turbine and the control time interval delta T of the idle runnable interface of wind energy turbine set scheduling fitting-type;
(2) the idle runnable interface of wind energy turbine set scheduling fitting-type judges whether current time is positioned at the object time section that scheduling is formulated, if not, do not accept other parameter settings of scheduling; If current time is positioned at the object time section that scheduling is formulated, accepts other parameters of scheduling, and using it as wind energy turbine set, dispatch the parameters of the idle runnable interface of fitting-type; Described other parameters comprise: the voltage influence factor K of wind energy turbine set reactive power, the object run voltage V of wind energy turbine set obj, the minimum pressure regulation ability of wind energy turbine set Δ V min, the maximum pressure regulation ability of wind energy turbine set Δ V max, wind energy turbine set operational voltage upper limit V max, wind energy turbine set working voltage lower limit V min, the idle allocation model of wind turbine of the idle runnable interface of wind energy turbine set scheduling fitting-type, the control time interval delta T of the idle runnable interface of wind energy turbine set scheduling fitting-type;
(3) the idle runnable interface of wind energy turbine set scheduling fitting-type is monitored the meritorious output of access point voltage and each blower fan of wind energy turbine set in object time section according to parameters described in (2), in each control time interval delta T, start, according to grid-connected point voltage, calculate total reactive requirement Q of wind energy turbine set;
(4) after obtaining total reactive requirement Q of wind energy turbine set, according to the idle allocation model of the wind turbine having arranged, reactive requirement is assigned to wind turbine; Wind turbine export on request or absorbing reactive power with regulation voltage;
(5) the idle runnable interface of wind energy turbine set scheduling fitting-type judges that current time whether in object time section, if so, returns to step (3); If not, return to step (1).
In the above-mentioned idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence, the pressure regulation instruction of the described idle runnable interface Shi Yi of wind energy turbine set scheduling fitting-type power system dispatching department is as parameter, by wind farm grid-connected point voltage and the meritorious interface that is converted to the instruction of wind energy turbine set reactive power/voltage control of exporting of blower fan.Because the powerless control system of wind energy turbine set is quick, online, and the decision-making of traffic department is off-line, relatively slow, therefore, between need to be set up an interface, the decision-making of traffic department can be reflected in the control of powerless control system of wind energy turbine set and go.
In the above-mentioned idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence, the minimum pressure regulation ability Δ V that described wind energy turbine set should have minwith maximum pressure regulation ability Δ V maxbe power scheduling department according to the electric power netting safe running in object time section or economical operation needs, the voltage-regulation of the wind energy turbine set of formulating must be able to cause in theory and minimum voltage variable quantity and the maximum voltage variable quantity of site.
In the above-mentioned idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence, described voltage security of operation need to refer to the object run voltage V by the wind energy turbine set of adjusting objmake working voltage the safest in theory, the probability that voltage out-of-limit occurs is minimum; Under this voltage security of operation requires, get the object run voltage V of wind energy turbine set objworking voltage scope [V in wind energy turbine set min, V max] mid point.
In the above-mentioned idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence, the idle allocation model of wind turbine of the idle runnable interface of described wind energy turbine set scheduling fitting-type comprises following two kinds of patterns:
Pattern one, mean allocation
Total reactive requirement is shared out equally to every typhoon motor;
The simple distribution of pattern two, the meritorious constraint of consideration,
In general, meritorious output is more, and the idle regulating power of wind turbine is just more weak.Therefore, can consider to allow the less wind turbine of meritorious output bear more voltage-regulation task, the more wind turbine of meritorious output is born less voltage-regulation task, thereby reaches the object of reasonable distribution reactive requirement.It is as follows that it realizes principle:
False wind motor meritorious and idle linear, and when total reactive requirement be timing (and sending idle), when meritorious zero of wind turbine is sent out, wind turbine sends and specified active-power P nsuitable idle of numerical value; When gaining merit of wind turbine completely sent out, wind turbine sends Q 0idle; When total reactive requirement when negative (and absorbing idle), when meritorious zero of wind turbine is sent out, wind turbine absorbs and 1.25 times of specified active-power Ps nsuitable idle of numerical value; When gaining merit of wind turbine completely sent out, wind turbine absorbs Q 1idle.Have
Q 0 = 1.25 P N + P N ( Q - 1.25 N P N ) &Sigma;P i ( 0 < Q &le; 1.25 N P N ) - - - ( 4 )
Q 1 = P N ( Q + 1.25 NP N ) &Sigma;P i - 1.25 P N ( - 1.25 N P N &le; Q &le; 0 ) - - - ( 5 )
Wherein, P ibe the meritorious output of i Fans, N is blower fan number.
The idle of i Fans is output as
Q i = Q 0 - 1.25 P N P N P i + 1.25 P N ( Q > 0 ) Q i = Q 1 + 1.25 P N P N P i - 1.25 P N ( Q < 0 ) - - - ( 6 )
This pattern is controlled comparatively reasonable under specific circumstances, but as wind energy turbine set total meritorious, to export when very little precision very poor, should be switched to pattern one.Meanwhile, when reactive requirement is greater than NP ntime, also should be switched to pattern one.
Compare with the idle operation method of existing wind energy turbine set, the present invention has following advantage:
(1) the present invention is incorporated into the decision-making of power scheduling the idle in service of wind energy turbine set first, makes wind energy turbine set participate in initiatively pressure regulation, not only can suppress voltage fluctuation, can also make voltage operate in rational level simultaneously.
(2) institute of the present invention extracting method builds on current wind energy turbine set powerless control system, makes wind energy turbine set powerless control system very valuable supplementary.Without increasing electric equipment, invest the particularly huge investment of dynamic passive compensation equipment, method is simple, can be adapted for easily software to realize automatic operation, is convenient to promote.
(3) the present invention possesses from becoming excellent characteristic, and the longer control effect of time that is applied to operation is better.
Accompanying drawing explanation
Fig. 1 is the idiographic flow schematic diagram that is applicable to the idle operation method of wind energy turbine set scheduling fitting-type of high-voltage fence.
Fig. 2 be before ocean wind energy turbine set under large mode and little mode, idle relation of exerting oneself with next stop, ocean high side voltage.
Embodiment
Below in conjunction with accompanying drawing and example, specific embodiment of the invention is described further, but enforcement of the present invention and protection are not limited to this.
The idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence comprises:
(1) the power scheduling parameters of wind energy turbine set scheduling fitting-type interface in the time period that sets objectives: first, calculate the voltage influence factor K of wind energy turbine set reactive power; Secondly, by provided the working voltage scope [V of wind energy turbine set by GB GB/T 19963-2011 < < wind energy turbine set access power system technology regulation > > min, V max].Again, according to management and running safety or economic pressure regulation needs, the object run voltage V of wind energy turbine set in the idle operational objective time period is formulated in scheduling obj, and the wind energy turbine set minimum pressure regulation ability Δ V that should have min, maximum pressure regulation ability Δ V max.Finally, determine the idle allocation model of wind turbine of the idle runnable interface of wind energy turbine set scheduling fitting-type and the control time interval delta T of the idle runnable interface of wind energy turbine set scheduling fitting-type.
The impact of wind energy turbine set on line voltage is mainly that the voltage of wind energy turbine set access point and near grid nodes thereof is affected.In the ordinary course of things, the increase of the reactive power that the voltage of electrical network sends with wind energy turbine set is similar to the trend that is linear growth, the increase of the reactive power absorbing with wind energy turbine set is similar to and is linear downward trend, and the variable quantity of the caused line voltage of wind energy turbine set unit's idle work variable quantity is a constant.Defining this parameter is the voltage influence factor K of wind energy turbine set reactive power.
In high-voltage fence, impedance ratio is very little, can think that gaining merit of wind energy turbine set is very little to voltage influence, so the computational methods of the voltage influence factor K of wind energy turbine set reactive power is
K = V 2 - V 1 P N
Wherein, V 2for wind energy turbine set meritorious zero, send out, reactive power is pressed rated power P nthe voltage of when numerical values recited is sent and site, V 1for meritorious, the idle all voltage of zero while sending out and site of wind energy turbine set.
Working voltage scope [the V of wind energy turbine set min, V max] can be provided by operating standard or relevant national standard.At present, GB GB/T 19963-2011 < < wind energy turbine set access power system technology regulation > > has clear and definite regulation to the voltage range of operation of wind farm grid-connected point.Also site to 110kV and above thereof, wind energy turbine set operational voltage upper limit V max, wind energy turbine set working voltage lower limit V minbe respectively 1.07,0.97 times of rated voltage.
The object run voltage V of wind energy turbine set in section objcan adjust by following two kinds of methods.
1) if consider the steady state Safe Operation of voltage, the object run voltage V of the wind energy turbine set of can adjusting as follows obj.
V Obj = V Min + V Max 2
Wherein, V minfor wind energy turbine set working voltage lower limit, V maxfor wind energy turbine set operational voltage upper limit.
2) if consider the economical operation of voltage, the object run voltage V of the wind energy turbine set of can adjusting as follows objthe conclusion that should draw according to methods such as idle work optimization calculating is adjusted.
Introduce the minimum pressure regulation ability Δ V of wind energy turbine set below min, maximum pressure regulation ability Δ V max.
Consider the constraint of wind turbine internal structure, when wind turbine is in different conditions lower time, the idle output limit of wind turbine also has difference.In general, meritorious output is fewer, and the idle regulating power of wind turbine is just stronger; Meritorious output is more, and the idle regulating power of wind turbine is just more weak.In order to make wind turbine bring into play maximum pressure regulation ability, the idle output limit in the time of can considering the setting of maximum pressure regulation ability and wind energy turbine set zero to send out is corresponding, and idle output limit when the setting of minimum pressure regulation ability is completely sent out with wind energy turbine set is corresponding.But this set more complicated, the idle output limit of general variable speed constant frequency blower fan is at the rated power P of 1.5 times nleft and right, to minimum pressure regulation ability Δ V min, maximum pressure regulation ability Δ V maxsetting can be decided according to the actual requirements, only otherwise exceed this limit.
The setting of determining the control time interval delta T of the idle runnable interface of wind energy turbine set scheduling fitting-type should be considered the problem of two aspects.The one, control precision, the less control precision of control time interval delta T is higher; The 2nd, the idle control rate of blower fan, control time interval delta T should enough can be adjusted to desired quantity by idle output so that assurance wind turbine is interior at this moment greatly.
The idle allocation model of wind turbine of the idle runnable interface of wind energy turbine set scheduling fitting-type will describe in detail in the back.Under default situations, lectotype one.
(2) the idle runnable interface of wind energy turbine set scheduling fitting-type is accepted the object time section setting that scheduling arranges.Judge whether current time is the object time section that scheduling is formulated, if not, other parameter settings of scheduling do not accepted; Whether current time is the object time section that scheduling is formulated if, accepts other parameters of scheduling, and using it as wind energy turbine set, dispatches the parameters of the idle runnable interface of fitting-type.Other parameters comprise: the voltage influence factor K of wind energy turbine set reactive power, the object run voltage V of wind energy turbine set obj, the minimum pressure regulation ability of wind energy turbine set Δ V min, the maximum pressure regulation ability of wind energy turbine set Δ V max, wind energy turbine set operational voltage upper limit V max, wind energy turbine set working voltage lower limit V min, the idle allocation model of the wind turbine of the idle runnable interface of wind energy turbine set scheduling fitting-type, the control time interval delta T of the idle runnable interface of wind energy turbine set scheduling fitting-type.
(3) the idle runnable interface of wind energy turbine set scheduling fitting-type is monitored the meritorious output of access point voltage and each blower fan of wind energy turbine set in object time section according to parameters described in (2).At each control time interval, start, according to grid-connected point voltage, calculate total reactive requirement Q of wind energy turbine set.
The principle of the idle runnable interface of wind energy turbine set scheduling fitting-type is as follows:
Total idle the exerting oneself that first the idle runnable interface of wind energy turbine set scheduling fitting-type limits wind energy turbine set regulates in a less operation area according to grid voltage change.When voltage is higher, wind energy turbine set is sent idle to support voltage; When voltage is lower, thereby wind energy turbine set absorbs the idle voltage drop that makes.
First total reactive requirement of wind energy turbine set can be determined the idle permission output area [Q that current voltage is corresponding by following formula vMin, Q vMax].
Q Q Min &le; V - V Obj V Min - V Obj &le; Q Q Max ( V Obj &le; V &le; V max Q &le; 0 , ) Q Q max &le; V - V Obj V Min - V Obj &le; Q Q Min ( V Min &le; V &le; V Obj Q &GreaterEqual; 0 , )
Wherein, total reactive requirement that Q is wind energy turbine set.Total reactive requirement Q of wind energy turbine set represents the reactive power that wind energy turbine set is sent while being positive number, represent the reactive power that wind energy turbine set absorbs during for negative.V is grid-connected point voltage.
Maximum reactive power Q max, minimum reactive power Q minby maximum pressure regulation ability Δ V maxwith minimum pressure regulation ability Δ V minthrough converting, obtain.
Q Max = &Delta;V Max / K Q Min = &Delta;V Min / K
For the idle regulation and control reservation nargin of wind turbine, Q maxshould not be greater than the wind energy turbine set installed capacity of 1.25 times.While exceeding, should suitably adjust maximum pressure regulation ability Δ V max, minimum pressure regulation ability Δ V minsetting.
Obtain total reactive requirement scope [Q of wind energy turbine set vMin, Q vMax] after, a little less than considering when wind energy turbine set is completely sent out that idle ability of regulation and control is, and zero ability of regulation and control while sending out is stronger.Total reactive requirement Q need determine according to the meritorious output of wind energy turbine set.
Q = Q VMin - Q VMax P WT P O + Q Max
Wherein, P wTfor wind energy turbine set installed capacity, P ofor the meritorious output of current wind energy turbine set.
(4) after obtaining total reactive requirement Q of wind energy turbine set, according to the idle allocation model of the wind turbine having arranged, reactive requirement is assigned to wind turbine.Wind turbine export on request or absorbing reactive power with regulation voltage.
After having determined total reactive requirement Q, the idle output of every typhoon motor distributes and can be undertaken by following two kinds of patterns: pattern one, mean allocation; Pattern two, consider the simple distribution of meritorious constraint, this pattern is controlled comparatively reasonable under specific circumstances, but when wind energy turbine set total meritorious, to export when very little precision very poor, should be switched to pattern one.Meanwhile, when reactive requirement is greater than NPN, also should be switched to pattern one.
(5) the idle runnable interface of wind energy turbine set scheduling fitting-type judges that current time whether in object time section, if so, returns to step (3); If not, return to step (1).
Be below an example of calculation shows of the inventive method, take the 110kV of Zhanjiang City in 2010 and above upper strata electrical network carries out simulation calculation as example.Within 2010, Zhanjiang electrical network comprises 1 500kV transformer station, 10Zuo 220kV transformer station, 74Zuo 110kV transformer station, and a wind energy turbine set, i.e. wind energy turbine set before ocean.Its installed capacity is 49.5MW, boosts by the 110kV circuit access new small house of 110kV station.
Fig. 1 has reflected the idiographic flow of the idle operation method of wind energy turbine set scheduling fitting-type that is applicable to high-voltage fence.Concrete implementation step is as follows:
1) Zhanjiang power scheduling parameters of the idle runnable interface of wind energy turbine set scheduling fitting-type in the time period that sets objectives;
2) before ocean, the idle runnable interface of wind energy turbine set scheduling fitting-type judges whether current time is positioned at the object time section that scheduling is formulated, if not, do not accept other parameter settings of scheduling; Otherwise, be accepted as parameter setting.
3) the idle runnable interface of wind energy turbine set scheduling fitting-type is according to 2) described in parameters in object time section, monitor the meritorious output of access point voltage and each blower fan of wind energy turbine set.In each time interval, according to grid-connected point voltage, calculate total reactive requirement of wind energy turbine set
4) after obtaining total reactive requirement of wind energy turbine set, according to the idle allocation model of the wind turbine having arranged, reactive requirement is assigned to wind turbine.Wind turbine export on request or absorbing reactive power with regulation voltage.
5) the idle runnable interface of wind energy turbine set scheduling fitting-type judges that current time whether in object time section, if so, returns to step 3); If not, return to step 1).
Fig. 2 has reflected that foreign front wind energy turbine set is under large mode and little mode, idle relation of exerting oneself with next stop, ocean high side voltage.Visible, the voltage influence COEFFICIENT K of wind energy turbine set reactive power is between 0.25-0.26kV.For making wind energy turbine set performance maximum effect, value 0.26kV.
According to GB GB/T 19963-2011 < < wind energy turbine set access power system technology regulation > > requirement, the operational voltage upper limit V of wind farm grid-connected point before ocean maxfor 117.7kV, working voltage lower limit V min106.7kV.In order to make grid-connected point voltage there is maximum steady operation margin of safety, get object run voltage V objthe mean value of getting working voltage bound is 112.2kV.Meanwhile, the maximum pressure regulation ability that wind energy turbine set is set is 2kV, and minimum pressure regulation ability is 0.5kV;
Other parameters of power scheduling department are as follows:
The wind turbine reactive requirement allocation model of the idle runnable interface of wind energy turbine set scheduling fitting-type adopts pattern one, i.e. mean allocation.The object run time period is 14:00～14:30, because time period length is only 30min, the network load in the time changes little, is conducive to effective operation of the idle runnable interface of wind energy turbine set scheduling fitting-type.Control time interval delta T is set to 5s, in time period domestic demand, controls 360 times.
Subsequently, power scheduling sends to wind energy turbine set scheduling fitting-type interface by above parameters.
The parameters that wind energy turbine set scheduling fitting-type interface receiving scheduling is sent.Suppose that current time is 14:00:00, current time is positioned at object time section, and wind energy turbine set scheduling fitting-type interface is accepted to dispatch the parameters of sending and adopted new argument operation.
Next, the idle runnable interface of wind energy turbine set scheduling fitting-type detects grid-connected point voltage and wind energy turbine set is meritorious exports and calculate the reactive power that every typhoon motor should be exported, and every 10s once controls.
To suppose respectively that current network load situation is light load and two kinds of situations of heavy load below, show the control result of the idle runnable interface of wind energy turbine set scheduling fitting-type.Hypothesis simultaneously, the exerting oneself as 0MW and constant at short notice of wind energy turbine set, and the initial idle of wind energy turbine set is output as 0.
Under light load, the time dependent situation of the voltage of wind farm grid-connected point is as shown in table 1.
The time dependent situation of wind farm grid-connected point voltage under table 1 light load
Under heavy load, the time dependent situation of wind farm grid-connected point voltage is as shown in table 2.
The time dependent situation of wind farm grid-connected point voltage under table 2 heavy load
From table 1,2, by China, Denmark's guide rule operation, the voltage of wind energy turbine set is change at random within the scope of one, and wind energy turbine set cannot guarantee self voltage, more cannot improve voltage.Under heavy load, according to Chinese guide rule, also make voltage have out-of-limit danger.
From table 1, under light load, adopt after the idle operation method operation of wind energy turbine set scheduling fitting-type, the grid-connected point voltage nearly 1kV that declines, voltage security of operation nargin improves.From table 2, under heavy load, adopt the idle operation method operation of wind energy turbine set scheduling fitting-type, the grid-connected point voltage nearly 0.5kV that rises, voltage more more approached target voltage 112.2kV, and security of operation nargin improves.
By above execution mode example, can be proved, the idle operation method of wind energy turbine set scheduling fitting-type can initiatively need to carry out pressure regulation according to scheduling, improves the security of operation nargin of grid-connected point voltage, can improve the deficiency of the idle operation of current wind energy turbine set.Meanwhile, the enforcement of the method is simple, easily realization.

Claims (7)

1.一种适用于高压电网的风电场调度配合型无功运行方法，其特征在于包括以下步骤：1. A wind farm dispatching coordination type reactive power operation method applicable to high-voltage power grid, is characterized in that comprising the following steps: (1)电力调度制定目标时间段内风电场调度配合型无功运行接口的设置参数：首先，电力调度针对当前时间段的电网网架，通过保持负荷不变和风电场有功不变，并更改风电场无功出力，计算无功运行目标时间段内风电场接入点的电压变化量与风电场输出无功功率变化量的比值，即风电场无功功率的电压影响因数K；其次，给出风电场的运行电压范围[VMin，VMax]，再次，根据电压运行安全需要或经济调压需要，调度制定无功运行目标时间段内风电场的目标运行电压VObj，及风电场应当具有的最小调压能力ΔVMin、最大调压能力ΔVMax；最后，确定风电场调度配合型无功运行接口的风电机无功分配模式和控制时间间隔ΔT；(1) Power dispatching formulates the setting parameters of the reactive power operation interface of the wind farm dispatching coordination type within the target time period: First, the power dispatching aims at the current time period grid structure, by keeping the load constant and the active power of the wind farm unchanged, and changing The reactive output of the wind farm is calculated by calculating the ratio of the voltage variation of the wind farm access point to the output reactive power variation of the wind farm within the target period of reactive power operation, that is, the voltage influence factor K of the reactive power of the wind farm; secondly, given The operating voltage range of the wind farm [V Min , V Max ], again, according to the safety needs of voltage operation or the needs of economic voltage regulation, the dispatcher formulates the target operating voltage V Obj of the wind farm within the target period of reactive power operation, and the wind farm should The minimum voltage regulation capability ΔV Min and the maximum voltage regulation capability ΔV Max ; finally, determine the wind turbine reactive power distribution mode and control time interval ΔT of the reactive power operation interface of the wind farm dispatch coordination type; (2)风电场调度配合型无功运行接口判断当前时间是否位于调度制定的目标时间段内，如果不是，则不接受调度的其他参数设置；如果当前时间位于调度制定的目标时间段内，则接受调度的其他设置参数，并将其作为风电场调度配合型无功运行接口的设置参数；所述其他设置参数包括：风电场无功功率的电压影响因数K、风电场的目标运行电压VObj、风电场最小调压能力ΔVMin、风电场最大调压能力ΔVMax，风电场运行电压上限VMax，风电场运行电压下限VMin，风电场调度配合型无功运行接口的风电机无功分配模式，风电场调度配合型无功运行接口的控制时间间隔ΔT；(2) The reactive power operation interface of the wind farm scheduling coordination type judges whether the current time is within the target time period set by the schedule, if not, it does not accept other parameter settings of the schedule; if the current time is within the target time period set by the schedule, then Accept other setting parameters of scheduling, and use them as the setting parameters of the wind farm scheduling coordination type reactive power operation interface; the other setting parameters include: the voltage influence factor K of the reactive power of the wind farm, the target operating voltage V Obj of the wind farm , wind farm minimum voltage regulation capability ΔV Min , wind farm maximum voltage regulation capability ΔV Max , wind farm operating voltage upper limit V Max , wind farm operating voltage lower limit V Min , wind farm reactive power distribution of wind farm dispatching coordination type reactive power operation interface mode, the control time interval ΔT of the reactive power operation interface of the wind farm scheduling coordination type; (3)风电场调度配合型无功运行接口根据(2)中所述设置参数在目标时间段内监测接入点电压和风电场各风机的有功输出，在每个控制时间间隔ΔT开始，根据并网点电压计算风电场的总无功需求Q；(3) According to the setting parameters in (2), the reactive power operation interface of wind farm dispatching monitors the voltage of the access point and the active power output of each fan in the wind farm within the target time period, starting at each control time interval ΔT, according to Calculate the total reactive power demand Q of the wind farm based on the grid-connected point voltage; (4)得到风电场的总无功需求Q以后，按照已设置的风电机无功分配模式，将无功需求分配到风电机；风电机按要求输出或吸收无功功率以调节电压；(4) After obtaining the total reactive power demand Q of the wind farm, allocate the reactive power demand to the wind turbine according to the set reactive power distribution mode of the wind turbine; the wind turbine outputs or absorbs reactive power as required to adjust the voltage; (5)风电场调度配合型无功运行接口判断当前时间是否处于目标时间段内，如果是，则返回步骤(3)；如果否，则返回步骤(1)。(5) The reactive power operation interface of the wind farm scheduling coordination type judges whether the current time is within the target time period, if yes, returns to step (3); if not, returns to step (1). 2.根据权利要求1所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于：所述的风电场调度配合型无功运行接口是以电力系统调度部门的调压指令作为参数，将风电场并网点电压和风机有功输出转换为风电场无功电压控制指令的接口。2. The wind farm dispatching coordination type reactive power operation method suitable for high-voltage power grid according to claim 1, characterized in that: the wind farm dispatching coordination type reactive operation interface is based on the voltage regulation command of the power system dispatching department As a parameter, it is an interface for converting the wind farm grid-connected point voltage and wind turbine active output into wind farm reactive voltage control commands. 3.根据权利要求1所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于：所述风电场应当具有的最小调压能力ΔVMin和最大调压能力ΔVMax是电力调度部门根据目标时间段内的电网安全运行或经济运行需要所制定的风电场的电压调节在理论上能够引起的并网点的最小电压变化量和最大电压变化量。3. The wind farm dispatching coordination type reactive power operation method suitable for high-voltage power grid according to claim 1, characterized in that: the minimum voltage regulation capability ΔV Min and the maximum voltage regulation capability ΔV Max that the wind farm should have are power The minimum voltage change and the maximum voltage change of the grid-connected point that the dispatching department can theoretically cause the voltage regulation of the wind farm according to the safe operation or economic operation of the power grid within the target time period. 4.根据权利要求1所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于：所述电压运行安全需要指的是通过整定风电场的目标运行电压VObj使运行电压在理论上最安全，发生电压越限的几率最小；在这种电压运行安全要求下，取风电场的目标运行电压VObj处于风电场的运行电压范围[VMin，VMax]的中点。4. The wind farm scheduling coordination type reactive power operation method suitable for high-voltage power grid according to claim 1, characterized in that: the voltage operation safety requirement refers to making the operating voltage V Obj by setting the target operating voltage V Obj of the wind farm Theoretically, it is the safest, and the probability of voltage exceeding the limit is the smallest; under this voltage operation safety requirement, the target operating voltage V Obj of the wind farm is taken to be at the midpoint of the operating voltage range [V Min , V Max ] of the wind farm. 5.根据权利要求1所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于：所述风电场调度配合型无功运行接口的风电机无功分配模式包括以下两种模式：5. The wind farm dispatching coordination type reactive power operation method suitable for high-voltage power grid according to claim 1, characterized in that: the wind turbine reactive power distribution mode of the wind farm dispatching coordination type reactive power operation interface includes the following two model: 模式一、平均分配Mode 1, average distribution 将总无功需求平均分摊到每台风电机；Evenly distribute the total reactive power demand to each wind turbine; 模式二、考虑有功约束的简单分配，Mode 2, considering the simple distribution of active power constraints, 让有功输出较少的风电机承担更多的电压调节任务，有功输出较多的风电机承担较少的电压调节任务，达到合理分配无功需求的目的。Let the wind turbines with less active power output undertake more voltage regulation tasks, and the wind turbines with more active power output undertake less voltage regulation tasks, so as to achieve the purpose of rationally allocating reactive power demand. 6.根据权利要求5所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于：所述模式二中：6. The wind farm dispatching coordination type reactive power operation method suitable for high-voltage power grid according to claim 5, characterized in that: in the second mode: 风电机的有功和无功呈线性关系，且当总无功需求为正时，风电机的有功零发时，风电机发出与额定有功功率PN数值相当的无功；当风电机的有功满发时，风电机发出Q0的无功；当总无功需求为负时，风电机的有功零发时，风电机吸收与1.25倍额定有功功率PN数值相当的无功；当风电机的有功满发时，风电机吸收Q1的无功，有The active power and reactive power of the wind turbine have a linear relationship, and when the total reactive power demand is positive and the active power of the wind turbine is zero, the wind turbine generates reactive power equivalent to the value of the rated active power P N ; when the active power of the wind turbine is full When generating power, the wind turbine emits reactive power of Q 0 ; when the total reactive power demand is negative, when the active power of the wind turbine is zero, the wind turbine absorbs reactive power equivalent to 1.25 times the rated active power P N value; when the wind turbine’s When the active power is fully generated, the wind turbine absorbs the reactive power of Q1 , and there is 其中，Pi为第i台风机的有功输出，N为风机数；Among them, P i is the active output of the i-th fan, and N is the number of fans; 则第i台风机的无功输出为Then the reactive power output of the i-th fan is 7.根据权利要求6所述的适用于高压电网的风电场调度配合型无功运行方法，其特征在于所述模式二中，当风电场的总有功输出很小时精度很差，应切换到模式一；同时，当无功需求大于风机数N与额定有功功率PN的乘积时，也应切换到模式一。7. The wind farm scheduling coordination type reactive power operation method suitable for high-voltage power grid according to claim 6, characterized in that in the second mode, when the total active power output of the wind farm is very small, the accuracy is very poor, and it should be switched to the mode One; at the same time, when the reactive power demand is greater than the product of the number of fans N and the rated active power P N , it should also switch to mode one.
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