A wind power penetration power limit calculation method and device and a storage medium

Abstract

The present application relates to a kind of wind power penetration power limit calculation method, device and storage medium, comprising: according to the first disturbance power expression of pre-set and offshore oilfield group power grid equivalent frequency response transfer function, the wind power penetration power limit under transient frequency safety constraint is calculated;According to the second disturbance power expression of pre-set and offshore oilfield group power grid equivalent frequency response transfer function, the wind power penetration power limit under steady-state frequency safety constraint is calculated;Select the smaller value in the wind power penetration power limit under transient frequency safety constraint and steady-state frequency safety constraint as the wind power penetration power limit of power grid.The present application can comprehensively consider the influence of fan low inertia, volatility on power grid transient, steady-state frequency safety and quickly solve offshore oilfield group power grid wind power penetration power limit, better meet the safety and stability demand of offshore oilfield group power grid.

Claims

1. A method for calculating the penetration power limit of wind power, applied to the power grid of offshore oilfield clusters, characterized in that, include: The wind power penetration limit under transient frequency security constraints is calculated based on the preset first disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid. The wind power penetration limit under steady-state frequency security constraints is calculated based on the preset second disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid. The smaller value between the wind power penetration power limit under transient frequency security constraints and steady-state frequency security constraints is selected as the wind power penetration power limit of the offshore oilfield cluster power grid. The expression for the first disturbance power includes: assuming the most severe fault in the offshore oilfield cluster power grid is an emergency shutdown due to a transmission system failure, then when the offshore oilfield cluster power grid experiences an emergency shutdown due to a transmission system failure, the first disturbance power... The expression is: Where n is the number of wind turbines connected. This refers to the rated capacity of a single fan. The active power baseline for the offshore oilfield cluster power grid is calculated using the following formula: in, This is the sum of the rated active power of all generator units in the offshore oilfield cluster power grid. Let k be the sum of the loads of all platforms in the offshore oilfield cluster's power grid. and( + The ratio of ) Calculate the power output fluctuation data for different wind turbines based on the probability density function of the power output fluctuation. The corresponding second disturbance power The calculation formula is: Where n is the number of wind turbines connected. This refers to the rated capacity of a single fan. The active power baseline for the offshore oilfield cluster power grid is calculated using the following formula: in, This is the sum of the rated active power of all generator units in the offshore oilfield cluster power grid. Let k be the sum of the loads of all platforms in the offshore oilfield cluster's power grid. and( + The ratio of ).

2. The method according to claim 1, characterized in that, The equivalent frequency response transfer function of the offshore oilfield cluster power grid is expressed as follows: in, For disturbance power, A positive value is defined as an increase in power output on the generation side or a decrease in power on the load side. For any disturbance power The corresponding frequency response results, The inertial time constant of the offshore oilfield cluster power grid. The damping coefficient of the power grid in the offshore oilfield cluster. This refers to the shunt coefficient of the power grid in offshore oilfield clusters. These are the feed control parameters for the gas turbine. This refers to the time constant for adjusting the valve position in the gas turbine. This is the exhaust time constant of the gas turbine compressor.

3. The method according to claim 1, characterized in that, The probability density function of wind turbine output fluctuation includes: Calculate wind turbine output fluctuation data The calculation formula is: in, for The total output of the wind farm at any given time, assuming the time span of the wind farm output data is 1000. , The range of values ​​is , To calculate the fluctuation time interval in the fluctuation data process, Number of wind turbines connected; wind turbine output fluctuation data The value range of is [-1, 1]; Wind turbine output fluctuation data The range from -1 to 1 is divided into N fluctuation intervals. The number of data points in each fluctuation interval is divided by the number of fluctuating wind turbine output data points. The total amount of data is used to obtain the probability density for each fluctuation range, and a wind turbine output fluctuation data is established. The probability density histogram; The probability density histogram is fitted to a continuous curve to obtain the probability density function of wind turbine output fluctuation. .

4. The method according to claim 1, characterized in that, The wind power penetration power limit under transient frequency security constraints, calculated based on the preset first disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid, includes: Assuming the number of wind turbines connected is 1, calculate the first input disturbance power. Frequency response of the offshore oilfield cluster power grid ; Calculate the maximum frequency change of the offshore oilfield cluster power grid and determine whether the maximum frequency response change of the offshore oilfield cluster power grid satisfies the transient frequency security constraints. ,in, This is the maximum allowable value for transient frequency change. The value is set to 3Hz; If the offshore oilfield cluster power grid meets the transient frequency safety constraints, increase the number of connected wind turbines by 1 and recalculate the corresponding first input disturbance power. Frequency response of the offshore oilfield cluster power grid The loop continues until the offshore oilfield cluster power grid fails to meet the transient frequency safety constraints, at which point the loop terminates. The final number of connected wind turbines is recorded by subtracting 1 from the number of connected turbines at the end of the cycle, using the formula... The wind power penetration limit under transient frequency safety constraints was calculated.

5. The method according to claim 1, characterized in that, The wind power penetration power limit under steady-state frequency security constraints, calculated based on the preset second disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid, includes: Assuming the number of wind turbines connected is 1, calculate the power output fluctuation data for different wind turbines based on the probability density function of the power output fluctuation. and corresponding input disturbance power Frequency response of the offshore oilfield cluster power grid ; According to the steady-state frequency deviation requirements of offshore oilfield cluster power grid Determine the maximum permissible wind turbine output fluctuation in the power grid of offshore oilfield clusters. ,in This represents the maximum allowable change in steady-state frequency. The value is 0.5Hz; Calculate the cumulative probability of allowable wind turbine output fluctuations in the power grid of offshore oilfield clusters. And judge Does it meet the steady-state frequency security constraints? ≥ The calculation formula is: in, This represents the minimum cumulative probability that the power output fluctuations of the offshore oilfield cluster's power grid are allowed to occur. The value is 0.8; If the offshore oilfield cluster power grid meets the steady-state frequency security constraints, increase the number of wind turbines connected by 1 and recalculate. and The maximum wind turbine output fluctuation allowed by the offshore oilfield cluster power grid was obtained. and cumulative probability And reassess the cumulative probability Does the steady-state frequency safety constraint meet, up to the cumulative probability? The loop terminates when the steady-state frequency safety constraint is not met. The final number of connected wind turbines is recorded by subtracting 1 from the number of connected turbines at the end of the cycle, using the formula... The wind power penetration limit under steady-state frequency safety constraints was calculated.

6. A wind power penetration power limit calculation device, applied to an offshore oilfield cluster power grid, for implementing the wind power penetration power limit calculation method as described in any one of claims 1 to 5, characterized in that, include: The first calculation module is used to calculate the wind power penetration limit under transient frequency security constraints based on the preset first disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid. The second calculation module calculates the wind power penetration limit under steady-state frequency security constraints based on the preset second disturbance power expression and the equivalent frequency response transfer function of the offshore oilfield cluster power grid. The comparison module is used to select the smaller value between the wind power penetration power limit under transient frequency security constraints and steady-state frequency security constraints as the wind power penetration power limit of the offshore oilfield cluster power grid.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a computer program for implementing the method as claimed in any one of claims 1 to 5.

8. A computing device, characterized in that, The computing device includes a memory and a processor, the memory being used to store a computer program that, when executed by the processor, implements the method as described in any one of claims 1 to 5.

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