CN104037816A - Calculation method for maximum output of wind-solar hybrid power generation in multi-source generation combined operation mode - Google Patents

Abstract

The invention relates to a calculation method for maximum output of wind-solar hybrid power generation in a multi-source generation combined operation mode and belongs to the technical field of operation and controlling of new energy sources connected to power systems. According to the method, maximum output of wind-solar power generation in the multi-source generation combined operation mode is calculated according to active power of a wind-solar power outgoing line, upper limit allowance of the active power, and downward adjustable allowance of active power of automatic generating sets in a wind-solar power combination area. Acceptance space of a power grid is mined on the premise of ensuring safety of the power grid, and wind-solar power utilization rate is increased as high as possible. The method has the advantages that the method can be integrated to a multi-source generation combined operation scheduling master system, using wind, solar, water and gas power generation, operating in a scheduling center, the system can implement the most appropriate control strategy according to current operating states of wind farms/photovoltaic power stations and safety allowances of wind/solar outgoing passages in real time, and different needs for safe, high-quality and economical control of the power grid are met accordingly.

Description

The maximized computational methods of honourable generated output under multi-source generating combining operation mode

Technical field

The present invention relates to the maximized computational methods of honourable generated output under a kind of multi-source generating combining operation mode, belong to the operation and control technical field of new forms of energy access electric power system.

Background technology

The features such as the strong randomness of wind/light resources, prediction difficulty, anti-peak regulation make electric network active scheduling controlling difficulty further.How to guarantee under the prerequisite of power grid security, at utmost utilizing wind power/photovoltaic generating resource, the wind power/photovoltaic of dissolving as much as possible generating has become one of common challenge that each wind power/photovoltaic generating place, base electrical network faces at present.At present, industry has been carried out large quantity research to the active power scheduling controlling after wind power/photovoltaic generating access, and obtains a series of research and application achievements.Actual field operating experience shows, introduces quick wind-force/photovoltaic generation scheduling of minute level and control in real time in active power scheduling controlling system, to ensureing power grid security, reduces restriction wind power/photovoltaic power generation loss and can play remarkable effect.

At present, engineering actual field lacks for the maximized computational methods of honourable generated output under multi-source generating combining operation mode, caused due to electrical network receivability wind power/photovoltaic generating capacity is underestimated to the brought light of abandoning, reduced the utilance of wind power/photovoltaic generating.

Summary of the invention

The object of the invention is to propose the maximized computational methods of honourable generated output under a kind of multi-source generating combining operation mode, for continuing to follow the tracks of the wind power/photovoltaic generating access state of electrical network, and utilize backspin that the whole network participates in automatic-generation-control unit for the nargin wind power/photovoltaic generating of dissolving, and at automatic generation control (hereinafter to be referred as AGC) backspin for nargin deficiency or wind/light collection region and electrical network connection line section when out-of-limit, start restriction wind power/photovoltaic Generation Control, to ensure power grid security.

The maximized computational methods of honourable generated output under the multi-source generating combining operation mode that the present invention proposes, comprise the following steps:

(1) active power of the interconnection between setting electrical network and honourable collection region control dead band is in electrical network, the backspin of automatic generation control is respectively for higher limit and the lower limit in dead band with

(2) from the data acquisition of electrical network and supervisor control, obtain current operation of power networks information, operation information comprises the active power total capacity of all automatic-generation-control unit that drop in electrical network the backspin of current all automatic-generation-control unit is for summation the active power instantaneous value of the interconnection between electrical network and honourable collection region and the active power plan value of the interconnection between electrical network and honourable collection region

(3) the active power total capacity of all automatic-generation-control unit that drop in above-mentioned electrical network is greater than zero, time, carry out following judgement calculating:

If the backspin of all automatic-generation-control unit that (3-1) drop in current electrical network is greater than the middle automatic generation control backspin of above-mentioned steps (1) for deadband upper limit, for summation the wind power/photovoltaic of current electrical network generating receivability ability for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},h}$

(3 ?2) are if the backspin of all automatic-generation-control unit that drop in current electrical network is less than in above-mentioned steps (1) automatic generation control backspin for deadband lower limit, for summation the wind power/photovoltaic of current electrical network generating receivability ability for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},l}$

(3 ?3) if the backspin of all automatic-generation-control unit that current electrical network drops into for summation for: the wind power/photovoltaic of current electrical network generating receivability ability is zero,

(4) the active power total capacity of all automatic-generation-control unit that drop in electrical network equals zero, time, carry out following judgement calculating:

(4 ?1) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}}$

(4 ?2) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}};$

(4 ?3) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability is zero,

The maximized computational methods of honourable generated output under the multi-source generating combining operation mode that the present invention proposes, its advantage is: this method is sent the nargin of circuit active power and the meritorious upper limit according to wind/photoelectricity, in conjunction with the downward adjustable nargin of active power of automatic generation unit in wind/photoelectricity collection region, calculate wind light generation under the multi-source generating combining operation mode maximization computational methods of exerting oneself.Ensureing under the prerequisite of power grid security, excavate the receiving space of electrical network, maximum possible improves wind/solar photovoltaic utilization rate.This method can be integrated in the generating of the multi-source containing the honourable aqueous vapor cooperation scheduling station system of control centre's operation, make this system can be in real time according to the running status of current wind energy turbine set/photovoltaic plant and wind/light, send the margin of safety of passage, implement optimum control strategy, to realize the demand for control of different power grid securities, high-quality, economy.

Embodiment

The maximized computational methods of honourable generated output under the multi-source generating combining operation mode that the present invention proposes, comprise the following steps:

(1) active power of the interconnection between setting electrical network and honourable collection region control dead band is in electrical network, the backspin of automatic generation control is respectively for higher limit and the lower limit in dead band with generally by management and running personnel, manually specified, typical span be 5-10 megawatt, typical value be 200-100 megawatt, typical value be respectively 100 ?50 megawatts.

(2) from the data acquisition of electrical network and supervisor control, obtain current operation of power networks information, operation information comprises the active power total capacity of all automatic-generation-control unit that drop in electrical network the backspin of current all automatic-generation-control unit is for summation the active power instantaneous value of the interconnection between electrical network and honourable collection region and the active power plan value of the interconnection between electrical network and honourable collection region

(3) the active power total capacity of all automatic-generation-control unit that drop in above-mentioned electrical network is greater than zero, time, carry out following judgement calculating:

(3 ?1) are if the backspin of all automatic-generation-control unit that drop in current electrical network is greater than in above-mentioned steps (1) automatic generation control backspin for deadband upper limit, for summation characterizing current electrical network has enough automatic generation control active power backspins standby, can continue to receive wind power/photovoltaic generating, the wind power/photovoltaic generating receivability ability of current electrical network for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},h}$

(3 ?2) are if the backspin of all automatic-generation-control unit that drop in current electrical network is less than in above-mentioned steps (1) automatic generation control backspin for deadband lower limit, for summation the meritorious backspin of AGC that characterizes current electrical network is standby not enough, need to limit wind power/photovoltaic and generate electricity to ensure power grid security, the wind power/photovoltaic generating receivability ability of current electrical network for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},l}$

The negative value calculating represents to limit wind power/photovoltaic generating.

(3 ?3) if the backspin of all automatic-generation-control unit that current electrical network drops into for summation for: the wind power/photovoltaic of current electrical network generating receivability ability is zero, illustrate that not needing to limit wind power/photovoltaic generating can not continue to increase wind power/photovoltaic generating receiving amount.

(4) the active power total capacity of all automatic-generation-control unit that drop in electrical network equals zero, time, carry out following judgement calculating:

(4 ?1) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: characterizing current electrical network has enough spaces to receive wind power/photovoltaic generating, the wind power/photovoltaic generating receivability ability of current electrical network for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}}$

(4 ?2) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: characterize the active power that in current net, generator sends excessive, need to limit wind power/photovoltaic and generate electricity to ensure power grid security, the wind power/photovoltaic generating receivability ability of current electrical network for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}}$

The negative value calculating represents to limit wind power/photovoltaic generating.

(4 ?3) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability is zero, do not need to limit wind power/photovoltaic generating and can not continue to increase wind power/photovoltaic generating receiving amount.

Size according to the wind power/photovoltaic generating receivability ability of the above-mentioned current electrical network calculating, is divided into three kinds by the wind power/photovoltaic generating access state of current electrical network:

If enter restriction wind power/photovoltaic generating state, current electrical network need to limit wind power/photovoltaic and generate electricity to ensure power grid security.

If enter maintenance state; Current electrical network does not need to limit wind power/photovoltaic generating can not continue to increase wind power/photovoltaic generating.

If enter and increase wind power/photovoltaic generating state; Current electrical network can continue to receive wind power/photovoltaic generating, reduces the generating of restriction wind power/photovoltaic.

The maximized computational methods of honourable generated output under the multi-source generating combining operation mode that the present invention proposes, the data acquisition wherein relating to and supervisor control (Supervisory Control And Data Acquisition, SCADA) take cyber-net communication as basis, Real-Time Power System Operation States is carried out to monitoring and controlling.

The automatic-generation-control unit relating in this method, refers to the generating set that participates in automatic generation control in electrical network.Automatic generation control (Automatic Generation Control, AGC) be a kind of of the adjustment of electric power system active power and FREQUENCY CONTROL, AGC is one of main contents of dispatching automation of electric power systems, the closed-loop control system of utilizing control centre's side supervisory control comuter, telecontrol channel, generating set automation device etc. to form, the frequency of monitoring, adjustment electric power system, to control generator output.

The automatic-generation-control unit backspin relating in this method is standby, is used for characterizing the lowered space of unit active power maximum.If the active power currency of unit i is under active power, be limited to the active power backspin of unit i is standby be defined as: $p_i^{\mathrm{cap}}=p_i^{\mathrm{curr}}-p_i^{\min }.$

The backspin of the automatic generation control relating in this method is in order to reduce the frequent movement of generating set controller for speed governing system for dead band, the frequency modulation dead band arranging in the primary frequency modulation control loop of generating set.

The active power of the interconnection between the electrical network relating in this method and honourable collection region is controlled dead band, is the interconnection active power dead band arranging in order to reduce the frequent movement of electric network active power controller.

Claims (1)

1. maximized computational methods of honourable generated output under multi-source generating combining operation mode, is characterized in that the method comprises the following steps:

(1) active power of the interconnection between setting electrical network and honourable collection region control dead band is in electrical network, the backspin of automatic generation control is respectively for higher limit and the lower limit in dead band with

(2) from the data acquisition of electrical network and supervisor control, obtain current operation of power networks information, operation information comprises the active power total capacity of all automatic-generation-control unit that drop in electrical network the backspin of current all automatic-generation-control unit is for summation the active power instantaneous value of the interconnection between electrical network and honourable collection region and the active power plan value of the interconnection between electrical network and honourable collection region

(3) the active power total capacity of all automatic-generation-control unit that drop in above-mentioned electrical network is greater than zero, time, carry out following judgement calculating:

If the backspin of all automatic-generation-control unit that (3-1) drop in current electrical network is greater than the middle automatic generation control backspin of above-mentioned steps (1) for deadband upper limit, for summation the wind power/photovoltaic of current electrical network generating receivability ability for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},h}$

(3 ?2) are if the backspin of all automatic-generation-control unit that drop in current electrical network is less than in above-mentioned steps (1) automatic generation control backspin for deadband lower limit, for summation the wind power/photovoltaic of current electrical network generating receivability ability for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}={\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{cap}}-{\mathrm{\Δp}}_{\mathrm{agc}}^{\mathrm{dead},l}$

(3 ?3) if the backspin of all automatic-generation-control unit that current electrical network drops into for summation for: the wind power/photovoltaic of current electrical network generating receivability ability is zero,

(4) the active power total capacity of all automatic-generation-control unit that drop in electrical network equals zero, time, carry out following judgement calculating:

(4 ?1) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability for;

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}}$

(4 ?2) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability for:

${\mathrm{\Δp}}_{\mathrm{wind}}^{\mathrm{cap}}=(p_{\mathrm{tie}}^{\mathrm{sche}}-p_{\mathrm{tie}}^{\mathrm{dead}})-p_{\mathrm{tie}}^{\mathrm{curr}};$

(4 ?3) are if the active power instantaneous value of the interconnection between electrical network and honourable collection region in above-mentioned steps (2) control dead band with interconnection active power in above-mentioned steps (1) and the active power plan value of the middle interconnection of above-mentioned steps (2) between there is following relation: the wind power/photovoltaic of current electrical network generating receivability ability is zero,