结冰停机修改

ipfcst/ipfcst-console/src/main/java/com/jiayue/ipfcst/fileupload/job/UploadFileMatoushanJob.java

@@ -5,6 +5,7 @@ import cn.hutool.core.date.DateUtil;
 import cn.hutool.core.util.NumberUtil;
 import com.jiayue.ipfcst.common.core.exception.BusinessException;
 import com.jiayue.ipfcst.common.core.util.DateTimeUtil;
+import com.jiayue.ipfcst.common.data.constant.enums.PredictionModelEnum;
 import com.jiayue.ipfcst.common.data.entity.*;
 import com.jiayue.ipfcst.common.data.repository.*;
 import com.jiayue.ipfcst.common.data.service.BaseService;
@@ -71,6 +72,8 @@ public class UploadFileMatoushanJob extends BaseService {
 
   public static String stationCodeStr = "J00307";
 
+  public static int shutDownNumber = 0;
+
 
   /**
    * 每天凌晨5点30执行  现场每日7点20开始执行文件生成定时任务
@@ -80,7 +83,7 @@ public class UploadFileMatoushanJob extends BaseService {
   //@Scheduled(fixedRate = 1000*60)
   //  30 30 5 * * ? 0/1 * * * * ?
   //  30 10,25,30 5,17 * * ?
-  @Scheduled(cron = "30 10,25,30 5,17 * * ?")
+  @Scheduled(cron = "0/1 */1 * * * ?")
   public void createDqFile()  {
     log.info("时间 【" + DateTimeUtil.dateToStrLong(new Date()) + "】 马头山短期文件生成开始");
     //1.读取配置
@@ -90,7 +93,9 @@ public class UploadFileMatoushanJob extends BaseService {
     //3.查询nwp数据
     List<Nwp> listTemperature = getNwpDatas();
     //4.计算短期预测
-    caculateDqs(listTemperature);
+    List<ForecastPowerShortTerm> forecastPowerShortTerms = caculateDqs(listTemperature);
+    forecastPowerShortTermRepository.saveAll(forecastPowerShortTerms);
+    yesOrNoStartIcingShutdown();
     log.info("时间 【" + DateTimeUtil.dateToStrLong(new Date()) + "】 马头山短期文件生成完成");
   }
   /**
@@ -137,33 +142,29 @@ public class UploadFileMatoushanJob extends BaseService {
    * @param listTemperature
    */
   private List<ForecastPowerShortTerm> caculateDqs(List<Nwp> listTemperature) {
-    // 是否开启了结冰停机 1开启
-    String yesorno_start_icing_shotdown = super.getSysParameter("YESORNO_START_ICING_SHOTDOWN", "0");
     // 是否开启了解冻开机 1开启
-    String yesorno_start_thaw_boot = super.getSysParameter("YESORNO_START_THAW_BOOT", "0");
+    String yesorno_start_thaw_boot = super.getSysParameter("YESORNO_START_THAW_BOOT", "1");
     // 层高
     String windHeight = super.getSysParameter("WIND_HEIGHT", "30");
     List<ForecastPowerShortTerm> forecastPowerShortTermList = new ArrayList<>();
 
     List<IcingShutdown> icingShutdowns = new ArrayList<>();
     List<IcingShutdown> icingShutdownList = new ArrayList<>();
-    // 是否开启了结冰停机
-    if(yesorno_start_icing_shotdown.equals("1")){
-      icingShutdowns = parkedWindTurbine();
-    }
     // 是否开启了解冻开机
     if(yesorno_start_thaw_boot.equals("1")){
       icingShutdownList = thawBoot();
     }
-    for (Nwp nwp: listTemperature) {
 
+    for (Nwp nwp: listTemperature) {
       Float speed = Convert.toFloat(getHeightWs(nwp,windHeight).setScale(1, RoundingMode.HALF_UP));
 
       //风速小于3米每秒不发电
       if(speed<3f) {
         ForecastPowerShortTerm forecastPowerShortTerm = new ForecastPowerShortTerm();
         forecastPowerShortTerm.setForecastTime(nwp.getPreTime());
-        forecastPowerShortTerm.setFpValue(BigDecimal.ZERO);
+        forecastPowerShortTerm.setFpValue(BigDecimal.ZERO.setScale(2,RoundingMode.HALF_UP));
+        forecastPowerShortTerm.setGenDate(new Date());
+        forecastPowerShortTerm.setPredictionModelEnum(PredictionModelEnum.E1);
         forecastPowerShortTermList.add(forecastPowerShortTerm);
         continue;
       }
@@ -186,7 +187,7 @@ public class UploadFileMatoushanJob extends BaseService {
         //小于满发风速
         if (speed < fanInfo.getFullWindSpeed()) {
           //根据风机曲线点表获取功率值
-          totalPower += windTurbinePowerCurveMaps.get(fanInfo.getId() + "").get(Convert.toFloat(fanKey.split("-")[1]));
+          totalPower += windTurbinePowerCurveMaps.get(fanInfo.getFanId() + "").get(Convert.toFloat(fanKey.split("-")[1]));
           continue;
         }
         if (speed >= fanInfo.getCutOutSpeed()) {
@@ -218,25 +219,20 @@ public class UploadFileMatoushanJob extends BaseService {
       }
       ForecastPowerShortTerm forecastPowerShortTerm = new ForecastPowerShortTerm();
       forecastPowerShortTerm.setForecastTime(nwp.getPreTime());
-      forecastPowerShortTerm.setFpValue(NumberUtil.round(totalPower/1000,2));
-
-      // 结冰停机
-      for(IcingShutdown icingShutdown:icingShutdowns){
-        if(icingShutdown.getStartTime() < nwp.getPreTime() && nwp.getPreTime() < icingShutdown.getEndTime()){
-          forecastPowerShortTerm.setFpValue(NumberUtil.round(totalPower/1000 - 2 * icingShutdown.getShutDownNumber(),2));
-        }
-      }
+      forecastPowerShortTerm.setFpValue(NumberUtil.round(totalPower/1000,2).setScale(2,RoundingMode.HALF_UP));
+      forecastPowerShortTerm.setGenDate(new Date());
+      forecastPowerShortTerm.setPredictionModelEnum(PredictionModelEnum.E1);
 
       // 解冻开机
       for(IcingShutdown icingShutdown:icingShutdownList){
         if(icingShutdown.getStartTime() < nwp.getPreTime() && nwp.getPreTime() < icingShutdown.getEndTime()){
-          forecastPowerShortTerm.setFpValue(NumberUtil.round(totalPower/1000 + 2 * icingShutdown.getShutDownNumber(),2));
+          forecastPowerShortTerm.setFpValue(NumberUtil.round(totalPower/1000 + 2 * icingShutdown.getShutDownNumber(),2).setScale(2,RoundingMode.HALF_UP));
         }
       }
 
       // 计算超装机容量设置为92.7
       if(forecastPowerShortTerm.getFpValue().compareTo(new BigDecimal(93))> 0 ){
-        forecastPowerShortTerm.setFpValue(BigDecimal.valueOf(random()));
+        forecastPowerShortTerm.setFpValue(BigDecimal.valueOf(random()).setScale(2,RoundingMode.HALF_UP));
       }
       forecastPowerShortTermList.add(forecastPowerShortTerm);
     }
@@ -433,11 +429,11 @@ public class UploadFileMatoushanJob extends BaseService {
       for(ForecastPowerShortTerm f: forecastPowerShortTermList){
         // 修改短期数据
         if(new Date(f.getForecastTime()).after(startTime) && new Date(f.getForecastTime()).before(endTime)){
-          f.setFpValue(f.getFpValue().multiply(new BigDecimal(m.getModulus())));
+          f.setFpValue(f.getFpValue().multiply(new BigDecimal(m.getModulus())).setScale(2,RoundingMode.HALF_UP));
         }
         // 计算超装机容量设置为92.7
         if(f.getFpValue().compareTo(new BigDecimal(93)) > 0){
-          f.setFpValue(new BigDecimal(random()));
+          f.setFpValue(new BigDecimal(random()).setScale(2,RoundingMode.HALF_UP));
         }
       }
     }
@@ -481,16 +477,16 @@ public class UploadFileMatoushanJob extends BaseService {
       }
       // 九点的时候 小于2 设置为2
       if (f.getForecastTime() > nDate.getTime() && f.getForecastTime() < nHDate.getTime() && f.getFpValue().compareTo(new BigDecimal(2)) > 0) {
-        f.setFpValue(new BigDecimal(2));
+        f.setFpValue(new BigDecimal(2).setScale(2,RoundingMode.HALF_UP));
       }
       if(dateFormat.format(f.getForecastTime()).equals(ntDate) && f.getFpValue().compareTo(new BigDecimal(3)) < 0) {
-        f.setFpValue(new BigDecimal(3));
+        f.setFpValue(new BigDecimal(3).setScale(2,RoundingMode.HALF_UP));
       }
       if(new Date(f.getForecastTime()).after(tDate) && new Date(f.getForecastTime()).before(nextFDate) && f.getFpValue().compareTo(new BigDecimal(3.8)) < 0) {
-        f.setFpValue(new BigDecimal(3.8));
+        f.setFpValue(new BigDecimal(3.8).setScale(2,RoundingMode.HALF_UP));
       }
       if(new Date(f.getForecastTime()).after(fDate) && new Date(f.getForecastTime()).before(sDate) && f.getFpValue().compareTo(new BigDecimal(2)) < 0) {
-        f.setFpValue(new BigDecimal(2));
+        f.setFpValue(new BigDecimal(2).setScale(2,RoundingMode.HALF_UP));
       }
     }
     log.info("执行根据时间段修改最小值结束" + dateFormat.format(new Date()));
@@ -507,6 +503,43 @@ public class UploadFileMatoushanJob extends BaseService {
   }
 
   /**
+   * 是否开启结冰停机功能
+   *
+   */
+  public void yesOrNoStartIcingShutdown(){
+    // 是否开启了结冰停机 1开启 0未开启
+    String yesorno_start_icing_shotdown = super.getSysParameter("YESORNO_START_ICING_SHOTDOWN", "0");
+    // 15天
+    long startTimes = getMillisecondsSubDay();
+    long endTimes = startTimes + dayNum * 24 * 60 * 60 * 1000 - 15 * 60 * 1000;
+
+    // 是否开启了结冰停机
+    if(yesorno_start_icing_shotdown.equals("1")){
+      // 停机数据
+      List<IcingShutdown> icingShutdowns = parkedWindTurbine();
+
+      // 短期数据
+      List<ForecastPowerShortTerm> byForecastTimeBetween = forecastPowerShortTermRepository.findByForecastTimeBetween(startTimes, endTimes);
+
+      for(IcingShutdown icingShutdown: icingShutdowns){
+
+        for(ForecastPowerShortTerm forecastPowerShortTerm: byForecastTimeBetween){
+          // 短期数据在停机数据时间内
+          if(icingShutdown.getStartTime() <= forecastPowerShortTerm.getForecastTime() && forecastPowerShortTerm.getForecastTime() < icingShutdown.getEndTime()){
+            forecastPowerShortTerm.setFpValue(forecastPowerShortTerm.getFpValue().subtract(new BigDecimal(2 * icingShutdown.getShutDownNumber())));
+          }
+          // 如果小于0 则等于0
+          if(forecastPowerShortTerm.getFpValue().compareTo(BigDecimal.ZERO) < 0){
+            forecastPowerShortTerm.setFpValue(BigDecimal.ZERO);
+          }
+        }
+      }
+      // 保存修改后短期数据
+      forecastPowerShortTermRepository.saveAll(byForecastTimeBetween);
+    }
+  }
+
+  /**
    * 结冰停机
    *
    * @return
@@ -521,24 +554,25 @@ public class UploadFileMatoushanJob extends BaseService {
     // 持续降雪多长时间开始结冰 将军山
     String duration_of_snow_j = super.getSysParameter("DURATION_OF_SNOW_J", "18");
     // 停机间隔时间 马头山
-    String shut_down_number_time_interval_m = super.getSysParameter("SHUT_DOWN_NUMBER_TIME_INTERVAL_M", "18");
+    String shut_down_number_time_interval_m = super.getSysParameter("SHUT_DOWN_NUMBER_TIME_INTERVAL_M", "60");
     // 停机间隔时间 将军山
-    String shut_down_number_time_interval_j = super.getSysParameter("SHUT_DOWN_NUMBER_TIME_INTERVAL_J", "18");
+    String shut_down_number_time_interval_j = super.getSysParameter("SHUT_DOWN_NUMBER_TIME_INTERVAL_J", "60");
     // 强北风出现次数
     Integer snowHowLong = 0;
     // 强北风中断次数
     Integer snowHowLongCut = 0;
     // 返回集合
     List<IcingShutdown> icingShutdowns = new ArrayList<>();
-    // 系统时间
-    Date systemDate = new Date();
-    // 明晚
-    long tomrrow = DateUtil.endOfDay(DateUtil.offsetDay(systemDate,1)).getTime() + 1;
-    // 获取两天nwp数据
-    List<Nwp> nwpData = nwpService.getNwpData(DateUtil.beginOfDay(systemDate).getTime(), tomrrow);
+
+    // nwp数据
+    List<Nwp> nwpData = getNwpDatas();
+
+    // 停机数量
+    int iShutDownNumber = 0;
+
     // 临时对象
-    IcingShutdown icingShutdown = new IcingShutdown();
-    IcingShutdown icingShutdownM = new IcingShutdown();
+    IcingShutdown tempIS = new IcingShutdown();
+    IcingShutdown tempISM = new IcingShutdown();
 
     log.info("执行结冰停机方法开始，系统时间:"+ new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
     for(Nwp nwp: nwpData){
@@ -551,52 +585,50 @@ public class UploadFileMatoushanJob extends BaseService {
           snowHowLong = 0;
         }
       }
-
+      // 临时对象
+      IcingShutdown icingShutdown = new IcingShutdown();
+      IcingShutdown icingShutdownM = new IcingShutdown();
       // 到达将军山停机时间
       if(snowHowLong == Integer.parseInt(duration_of_snow_j) * 4){
+        iShutDownNumber += 1;
         icingShutdown.setStartTime(nwp.getPreTime());
-        icingShutdown.setEndTime(DateUtil.offsetHour(new Date(nwp.getPreTime()), Integer.parseInt(shut_down_number_time_interval_j)).getTime());
+        icingShutdown.setEndTime(DateUtil.offsetMinute(new Date(nwp.getPreTime()), Integer.parseInt(shut_down_number_time_interval_j)).getTime());
         icingShutdown.setShutDownNumber(1);
         icingShutdowns.add(icingShutdown);
       }
 
       if(snowHowLong > Integer.parseInt(duration_of_snow_j) * 4){
-        icingShutdown.setStartTime(icingShutdown.getEndTime());
-        icingShutdown.setEndTime(DateUtil.offsetHour(new Date(icingShutdown.getEndTime()), Integer.parseInt(shut_down_number_time_interval_j)).getTime());
-        icingShutdown.setShutDownNumber(icingShutdown.getShutDownNumber() + 1);
+        iShutDownNumber += 1;
+        icingShutdown.setStartTime(tempIS.getEndTime());
+        icingShutdown.setEndTime(DateUtil.offsetMinute(new Date(tempIS.getEndTime()), Integer.parseInt(shut_down_number_time_interval_j)).getTime());
+        icingShutdown.setShutDownNumber(iShutDownNumber);
         icingShutdowns.add(icingShutdown);
       }
 
       // 到达马头山停机时间
       if(snowHowLong == Integer.parseInt(duration_of_snow_m) * 4){
+        iShutDownNumber += 1;
         icingShutdownM.setStartTime(nwp.getPreTime());
-        icingShutdownM.setEndTime(DateUtil.offsetHour(new Date(nwp.getPreTime()), Integer.parseInt(shut_down_number_time_interval_m)).getTime());
-        icingShutdownM.setShutDownNumber(icingShutdown.getShutDownNumber() + 1);
+        icingShutdownM.setEndTime(DateUtil.offsetMinute(new Date(nwp.getPreTime()), Integer.parseInt(shut_down_number_time_interval_m)).getTime());
+        icingShutdownM.setShutDownNumber(iShutDownNumber);
         icingShutdowns.add(icingShutdownM);
       }
       if(snowHowLong > Integer.parseInt(duration_of_snow_m) * 4){
+        iShutDownNumber += 1;
         icingShutdownM.setStartTime(nwp.getPreTime());
-        icingShutdownM.setEndTime(DateUtil.offsetHour(new Date(nwp.getPreTime()), Integer.parseInt(shut_down_number_time_interval_m)).getTime());
-        icingShutdownM.setShutDownNumber(icingShutdown.getShutDownNumber() + 1);
+        icingShutdownM.setEndTime(DateUtil.offsetMinute(new Date(tempISM.getEndTime()), Integer.parseInt(shut_down_number_time_interval_m)).getTime());
+        icingShutdownM.setShutDownNumber(iShutDownNumber);
         icingShutdowns.add(icingShutdownM);
       }
+      tempIS = icingShutdown;
+      tempISM = icingShutdownM;
     }
 
-
-    try {
-      SysParameter shut_down_number = sysParameterService.getParameterBySysKey("SHUT_DOWN_NUMBER");
-      shut_down_number.setSysValue(String.valueOf(icingShutdowns.size()));
-      sysParameterService.update(shut_down_number);
-    } catch (BusinessException e) {
-      log.info("获取参数错误：" + e);
-    }
+    shutDownNumber = icingShutdowns.size();
     log.info("执行结冰停机方法结束，系统时间:"+ new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
     return icingShutdowns;
   }
 
-
-
-
   /**
    * 解冻开机
    *
@@ -604,9 +636,9 @@ public class UploadFileMatoushanJob extends BaseService {
    */
   public List<IcingShutdown> thawBoot(){
     // 解冻间隔时间 马头山
-    Integer thawing_interval_m = Integer.parseInt(super.getSysParameter("THAWING_INTERVAL_M", "1"));
+    Integer thawing_interval_m = Integer.parseInt(super.getSysParameter("THAWING_INTERVAL_M", "60"));
     // 解冻间隔时间 将军山
-    Integer thawing_interval_j = Integer.parseInt(super.getSysParameter("THAWING_INTERVAL_J", "1.2"));
+    Integer thawing_interval_j = Integer.parseInt(super.getSysParameter("THAWING_INTERVAL_J", "80"));
     // 开机温度
     String thawing_interval_temperature = super.getSysParameter("THAWING_INTERVAL_TEMPERATURE", "-1");
     // 系统时间
@@ -617,50 +649,48 @@ public class UploadFileMatoushanJob extends BaseService {
     // 临时对象
     IcingShutdown icingShutdown = new IcingShutdown();
     IcingShutdown icingShutdownM = new IcingShutdown();
-    // 停机数量
-    String shut_down_number = super.getSysParameter("SHUT_DOWN_NUMBER", "0");
     // 返回集合
     List<IcingShutdown> icingShutdowns = new ArrayList<>();
 
     Integer ifOfCount = 0;
     Integer ifOfCountM = 0;
-    Integer forM = 0;
-    Integer forJ = 0;
+    Integer forM = 4;
+    Integer forJ = 4;
 
-    if(thawing_interval_m > 0 && thawing_interval_m <= 1){
+    if(thawing_interval_m > 0 && thawing_interval_m <= 60){
       forM = 4;
-    }else if(thawing_interval_m > 1 && thawing_interval_m <= 1.2){
+    }else if(thawing_interval_m > 60 && thawing_interval_m <= 75){
       forM = 5;
-    }else if(thawing_interval_m > 1.2 && thawing_interval_m <= 1.4){
+    }else if(thawing_interval_m > 75 && thawing_interval_m <= 90){
       forM = 6;
-    }else if(thawing_interval_m > 1.4 && thawing_interval_m <= 1.6){
+    }else if(thawing_interval_m > 90 && thawing_interval_m <= 105){
       forM = 7;
-    }else if(thawing_interval_m > 1.6 && thawing_interval_m <= 2){
+    }else if(thawing_interval_m > 105 && thawing_interval_m <= 120){
       forM = 8;
     }
 
-    if(thawing_interval_j > 0 && thawing_interval_j <= 1){
+    if(thawing_interval_j > 0 && thawing_interval_j <= 60){
       forJ = 4;
-    }else if(thawing_interval_j > 1 && thawing_interval_j <= 1.2){
+    }else if(thawing_interval_j > 60 && thawing_interval_j <= 75){
       forJ = 5;
-    }else if(thawing_interval_j > 1.2 && thawing_interval_j <= 1.4){
+    }else if(thawing_interval_j > 75 && thawing_interval_j <= 90){
       forJ = 6;
-    }else if(thawing_interval_j > 1.4 && thawing_interval_j <= 1.6){
+    }else if(thawing_interval_j > 90 && thawing_interval_j <= 105){
       forJ = 7;
-    }else if(thawing_interval_j > 1.6 && thawing_interval_j <= 2){
+    }else if(thawing_interval_j > 105 && thawing_interval_j <= 120){
       forJ = 8;
     }
     log.info("执行解冻开机方法开始，系统时间:"+ DateFormatUtils.format(new Date(), "yyyy-MM-dd HH:mm:ss"));
     // 停机台数大于0
-    if(Integer.parseInt(shut_down_number) > 0) {
+    if(shutDownNumber > 0) {
       for (int i = 0; i < nwpData.size(); i++) {
-        if (Integer.parseInt(shut_down_number) > 0) {
+        if (shutDownNumber > 0) {
           // 当前点温度是否高于解冻温度  并判断下一小时内四个点的温度
           for (int j = i; j <= forJ; j++){
             if(nwpData.get(i).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0) {
               ifOfCount = ifOfCount + 1;
               Long preTime = nwpData.get(j).getPreTime();
-              Long preTimeJ = DateUtil.offsetHour(new Date(preTime), thawing_interval_j).getTime();
+              Long preTimeJ =DateUtil.offsetMinute(new Date(preTime), thawing_interval_j).getTime();
               icingShutdown.setStartTime(preTime);
               icingShutdown.setEndTime(preTimeJ);
               icingShutdown.setShutDownNumber(ifOfCount);
@@ -670,12 +700,13 @@ public class UploadFileMatoushanJob extends BaseService {
             if (nwpData.get(i).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0) {
               ifOfCountM = ifOfCountM + 1;
               Long preTime = nwpData.get(k).getPreTime();
-              Long preTimeM = DateUtil.offsetHour(new Date(preTime), thawing_interval_m).getTime();
+              Long preTimeM = DateUtil.offsetMinute(new Date(preTime), thawing_interval_m).getTime();
               icingShutdownM.setStartTime(preTime);
               icingShutdownM.setEndTime(preTimeM);
               icingShutdownM.setShutDownNumber(ifOfCountM);
             }
           }
+          shutDownNumber -= 2;
         }
       }
     }
@@ -684,40 +715,6 @@ public class UploadFileMatoushanJob extends BaseService {
     return icingShutdowns;
   }
 
-//            if(nwpData.get(i).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0){
-//    if(nwpData.get(i+1).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0){
-//      if(nwpData.get(i+2).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0){
-//        if(nwpData.get(i+3).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0){
-//          if(nwpData.get(i+4).getT().compareTo(new BigDecimal(thawing_interval_temperature)) > 0){
-//            ifOfCount = ifOfCount + 1;
-//            Long preTime = nwpData.get(i).getPreTime();
-//            Long preTimeJ = DateUtil.offsetHour(new Date(preTime),thawing_interval_j).getTime();
-//            Long preTimeM = DateUtil.offsetHour(new Date(preTime),Integer.parseInt(thawing_interval_m)).getTime();
-//            icingShutdown.setStartTime(preTime);
-//            icingShutdown.setEndTime(preTimeJ);
-//            icingShutdown.setShutDownNumber(ifOfCount);
-//            ifOfCountM = ifOfCountM + 1;
-//            icingShutdowns.add(icingShutdown);
-//            icingShutdownM.setStartTime(preTime);
-//            icingShutdownM.setEndTime(preTimeM);
-//            icingShutdownM.setShutDownNumber(ifOfCountM);
-//            i += 4;
-//          }else{
-//            continue;
-//          }
-//        }else{
-//          continue;
-//        }
-//      }else{
-//        continue;
-//      }
-//    }else{
-//      continue;
-//    }
-//  }else{
-//    continue;
-//  }
-
 
   /**
    * 判断风速是上升风还是下降风